[go: up one dir, main page]

WO2017018365A1 - Huile lubrifiante de moule de production d'un corps fritté de densité élevée, dispositif de revêtement par pulvérisation pour huile lubrifiante de moule, appareil de moulage de produits agglomérés équipé d'un dispositif de revêtement par pulvérisation, procédé de moulage de produits agglomérés utilisant l'appareil, et corps fritté obtenu par le procédé - Google Patents

Huile lubrifiante de moule de production d'un corps fritté de densité élevée, dispositif de revêtement par pulvérisation pour huile lubrifiante de moule, appareil de moulage de produits agglomérés équipé d'un dispositif de revêtement par pulvérisation, procédé de moulage de produits agglomérés utilisant l'appareil, et corps fritté obtenu par le procédé Download PDF

Info

Publication number
WO2017018365A1
WO2017018365A1 PCT/JP2016/071651 JP2016071651W WO2017018365A1 WO 2017018365 A1 WO2017018365 A1 WO 2017018365A1 JP 2016071651 W JP2016071651 W JP 2016071651W WO 2017018365 A1 WO2017018365 A1 WO 2017018365A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
green compact
lubricant
dispensing
needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/071651
Other languages
English (en)
Japanese (ja)
Inventor
博昭 小松原
正尚 小林
俊明 清水
まり子 大塚
登 島田
英睦 白鳥
厚士 大隈
明康 三共
幸一 加藤木
浩之 福島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PORITE Corp
R-Got Co Ltd
Aoki Science Institute Co Ltd
Original Assignee
PORITE Corp
R-Got Co Ltd
Aoki Science Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PORITE Corp, R-Got Co Ltd, Aoki Science Institute Co Ltd filed Critical PORITE Corp
Priority to JP2017530849A priority Critical patent/JPWO2017018365A1/ja
Publication of WO2017018365A1 publication Critical patent/WO2017018365A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/02—Well-defined hydrocarbons
    • C10M105/04—Well-defined hydrocarbons aliphatic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/02—Well-defined hydrocarbons
    • C10M105/06—Well-defined hydrocarbons aromatic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/68—Esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/02—Sulfurised compounds
    • C10M135/06—Esters, e.g. fats
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/12—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M135/14—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond
    • C10M135/18—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond thiocarbamic type, e.g. containing the groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • C10M137/04—Phosphate esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • C10M137/04—Phosphate esters
    • C10M137/10—Thio derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M155/00—Lubricating compositions characterised by the additive being a macromolecular compound containing atoms of elements not provided for in groups C10M143/00 - C10M153/00
    • C10M155/02—Monomer containing silicon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/02—Natural products
    • C10M159/08—Fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives

Definitions

  • the present invention provides a sintered compact such as a sintered alloy obtained by sintering a green compact obtained by compressing a metal powder into a mold at a high temperature to achieve high density of the sintered compact.
  • the present invention relates to a mold lubricating oil, a mold lubricating oil spray coating apparatus, and a green compact molding apparatus including the spray coating apparatus.
  • powder metallurgy is a metal processing method in which a metal powder poured into a metal mold made of a special steel material is pressed at high pressure to form a green compact, and the green compact is sintered. .
  • iron powder is compressed and compacted at a high pressure of 500 to 1000 MPa, and the compacted compact is sintered at 600 to 1250 ° C.
  • Powder metallurgy does not require cutting such as deburring after molding. Therefore, it is a metal processing method suitable for net shape.
  • two or more parts produced by powder metallurgy can be used in combination, or can be used as new parts by combining with parts made by other metal processing methods. Therefore, parts produced by powder metallurgy are used for complex parts such as automobile parts, household appliances, etc., multi-functional parts such as gears, pulleys, or magnetic materials.
  • a mixed lubricant such as metal soap is mixed with the metal powder in advance in order to reduce galling between the metal powder and the mold.
  • a solid lubricant for the mold that is directly applied to the mold is used.
  • These mixed lubricants and solid lubricants for molds have no significant difference in lubricating components.
  • solid lubricants such as stearic acid or stearates (also referred to as metal soaps) or waxes are used. Is used.
  • the mixed lubricant when the mixed lubricant is excessively mixed, there is a problem that the fluidity of the metal powder is hindered or the formed green compact does not become dense. Further, when the green compact of the metal powder is sintered, there is a problem in that the density of the green compact becomes low because voids are generated by removing the mixed lubricant. Furthermore, since a large amount of gas containing carbon dioxide, zinc oxide, and the like is generated in the sintering process, there is a problem that the working environment is deteriorated.
  • the mold temperature is set to about 95 ° C.
  • a stearic acid powder having a melting point of 70 ° C. is electrostatically applied to the inner surface by a triboelectric charging method as a mold lubricant.
  • a method has been proposed in which stearic acid powder is melted by heat to form a liquid lubricating coating (see, for example, Patent Document 1).
  • a liquid lubricating film formed by melting a solid lubricant has a high viscosity and is difficult to dry. For this reason, there is a drawback that dripping is likely to occur, non-uniform unevenness of the oil film is caused, and causes poor lubrication. Further, in such a method, a large amount of lubricant for the mold is applied, the lubricant for the mold sticks to the mold, the dimensional accuracy of the sintered body is impaired, and the sintered body There is also a drawback in that the coloration causes poor appearance. In addition, it is difficult to produce green compacts of any shape, such as compact green compacts or compact green compacts, in methods that require a large amount of lubricant for the mold. There is a drawback.
  • the method in which the lubricant applied to the mold is melted by heating has the disadvantage that it takes extra time until the lubricant melts and until a uniform oil film is formed after melting. is there. As a result, the cycle time for forming the green compact becomes long, and the production efficiency of the sintered body is reduced.
  • the method using such a solid or powder lubricant is also not suitable for applying a small amount of lubricant, so that it cannot produce small green compacts or compact green compacts. Has drawbacks.
  • Non-Patent Document 1 a method of dispersing powdered lithium stearate in water and applying it to a mold has been proposed (see Non-Patent Document 1, for example).
  • this method also has a drawback that since it takes time for water to evaporate, the cycle time for forming the green compact becomes long, and the production efficiency of the sintered body decreases.
  • the lubricant in powder form aggregates or unevenness in the oil film is caused, resulting in poor lubrication.
  • the present invention has been made in view of the above circumstances, and provides a mold lubricating oil, a spray coating apparatus, and a green compact molding apparatus that are excellent in quick drying and can form a uniform oil film with a small amount of coating.
  • an object of the present invention is to realize high-speed molding of a green compact and molding of a green compact of an arbitrary shape.
  • the mixed lubricant such as metal soap mixed with the metal powder
  • the void generated after sintering is reduced, and molding is performed at a high pressure to realize high density of the sintered body.
  • it aims at reducing the generation
  • the present invention relates to a mold lubricant containing a hydrocarbon solvent having 7 to 18 carbon atoms and an oiliness improver and / or extreme pressure agent.
  • the present invention is preferably a mold lubricating oil having a hydrocarbon solvent content of 50 to 98% by mass.
  • the present invention is preferably a mold lubricating oil in which the content of the oiliness improver and / or the extreme pressure agent is 20% by mass or less.
  • the hydrocarbon solvent is one or more kinds of solvents selected from the group consisting of paraffinic hydrocarbon solvents, olefinic hydrocarbon solvents, naphthene hydrocarbon solvents, and aromatic hydrocarbon solvents.
  • it is a mold lubricant.
  • the oiliness improver is a mold lubricating oil which is one or more compounds selected from the group consisting of silicones, animal and vegetable oils and fats, and higher fatty acid esters.
  • the extreme pressure agent is a mold lubricant which is one or more compounds selected from the group consisting of phosphate ester, TCP, sulfide sulfide oil, MoDTC, ZnDTP, and MoDTP.
  • the present invention further includes a needle having a substantially frustoconical inclined portion and a needle receiving portion having a substantially frustoconical inclined portion, and the needle and the needle receiving portion are each substantially frustoconical.
  • the present invention relates to a spray coating apparatus in which a mold lubricating oil can be fitted approximately at a slanted portion, and a mold lubricating oil passes between the substantially fitted needle and the needle receiving portion.
  • the present invention further includes a needle tip formed on a narrowed side of a substantially truncated cone-shaped inclined portion of the needle and a narrowed side of a substantially truncated cone-shaped inclined portion of the needle receiving portion.
  • the needle receiving hole is connected to an oil supply pipe for supplying the mold lubricating oil into the spray coating device on the side facing the needle receiving part.
  • the diameter of the needle receiving hole at the portion substantially mating with the needle tip is 0.6 to 1.8 mm, and the diameter of the needle tip is 0.5 to 1.7 mm.
  • the spray coating device preferably has a difference between the diameter of the needle receiving hole and the diameter of the needle tip portion of 0.05 to 0.4 mm.
  • the present invention is preferably a spray coating apparatus capable of spraying a mold lubricant at an amount of 0.01 to 10 ml / time.
  • the present invention further includes an injection nozzle having a plurality of air supply holes for supplying air and an oil supply hole for supplying mold lubricant to the mold, and a plurality of air supply holes are provided around the oil supply hole.
  • an injection nozzle having a plurality of air supply holes for supplying air and an oil supply hole for supplying mold lubricant to the mold, and a plurality of air supply holes are provided around the oil supply hole.
  • the green compact molding apparatus of the present invention includes a coating means for applying mold lubricant oil by a spray coating apparatus, a filling means for filling metal powder in a mold coated with the mold lubricant oil, and pressing the filled metal powder. And forming means for forming the green compact, extraction means for extracting the formed green compact to the upper part of the mold, and dispensing means for discharging the extracted green compact from the upper part of the mold.
  • the dispensing means and the spray coating device move in conjunction with a dispensing direction that is a direction toward the upper part of the mold in a state before dispensing, and the dispensing means is more along the dispensing direction than the spray coating device.
  • the present invention relates to a green compact molding apparatus as described above.
  • the dispensing means, the spray coating apparatus, and the filling means move in conjunction with a dispensing direction that is a direction toward the upper part of the mold in a state before dispensing. is there.
  • the filling means is provided behind the spray application device along the dispensing direction, and the spray coating device and the filling means move in the dispensing direction in conjunction with each other, so that the filling means is connected to the mold by the spray coating device.
  • the present invention is preferably a green compact molding apparatus as described above.
  • the green compact molding apparatus of the present invention further includes a scraping means for scraping off the metal powder existing above the mold among the metal powder filled in the mold.
  • the dispensing means and the spray coating device are configured to reciprocate alternately in the dispensing direction and the reverse direction of the dispensing direction to dispense the green compacts that are sequentially molded, and repeatedly apply the mold lubricant to the mold.
  • the scraping means is provided behind the spray applicator along the dispensing direction, and the metal powder filled in the mold is moved in the reverse direction of the dispensing direction in conjunction with the spray applicator and the scraping means. Scrape off.
  • the present invention is preferably a green compact molding apparatus as described above.
  • the green compact molding method of the present invention includes a coating process in which a mold lubricant is applied by a spray coating device, a filling process in which a metal powder is filled in a mold coated with the mold lubricant, and the filled metal powder is pressed.
  • the dispensing means and the spray coating device move in conjunction with the dispensing direction, which is the direction toward the upper part of the mold in the state before dispensing, and the dispensing means is more forward in the dispensing direction than the spray coating device.
  • the present invention relates to a green compact molding method as described above.
  • the present invention relates to a sintered body obtained by sintering the green compact formed by the green compact forming method.
  • the mold lubricant of the present invention it is possible to provide a mold lubricant that is excellent in quick-drying and can form a uniform oil film with a small amount of coating. Powder molding can be realized. Further, by using the above-described mold lubricant oil, a sintered body can be produced at high speed without generating galling even if the mixed lubricant such as metal soap mixed with the metal powder is reduced.
  • the mixed lubricant such as metal soap mixed with the metal powder
  • the voids generated after sintering can be reduced, and molding can be performed at a high pressure to achieve high density of the sintered body. it can.
  • the generation of gases such as carbon dioxide and zinc oxide can be reduced, and the deterioration of the working environment can be reduced.
  • the mold lubricant of the present invention an oil film that maintains high strength can be formed on the mold surface without heating the mold. Moreover, the mold lubricating oil of the present invention can suitably exhibit lubricating performance even under high pressure.
  • the composition of the mold lubricant of the present invention will be described in detail.
  • the mold lubricating oil of the present invention is a composition containing a hydrocarbon solvent having 7 to 18 carbon atoms and an oiliness improver or extreme pressure agent. Since the mold lubricant has the above composition, quick drying is enhanced and a uniform and uniform oil film is formed, so that high-speed molding of compacts and compacts of arbitrary shapes can be realized. become. In addition, by using the above mold lubricant, the sintered body can be produced at high speed without generating galling even if the mixed lubricant mixed with the metal powder is reduced.
  • the mixed lubricant mixed with the metal powder can be reduced. Molding can achieve high density of the sintered body. In addition, the generation of gases such as carbon dioxide and zinc oxide can be reduced to reduce the deterioration of the working environment.
  • the mold lubricant of the present invention is excellent in quick-drying property, an oil film is easily formed at room temperature, and it is not necessary to heat the mold. Therefore, the mold lubricating oil of the present invention can be used, for example, in a mold having a surface temperature of 40 ° C. or less. As described above, since the time for heating the mold and the time for melting the lubricant used in the mold are not required, the molding process of the green compact can be speeded up.
  • the mold lubricant of the present invention can be applied in a small amount as will be described later, it is preferable to apply to the mold using a spray coating apparatus among general coating methods.
  • a spray coating apparatus By applying the mold lubricating oil of the present invention to a mold with a spray coating apparatus, it becomes easy to realize compacting of an arbitrarily shaped green compact such as a compact green compact or a fine green compact.
  • the kinematic viscosity of the mold lubricant at 40 ° C. is preferably 2 to less than 100 mm 2 / s.
  • the spray pump of the spray coating device tends to be easily worn.
  • the kinematic viscosity at 40 ° C. of the mold lubricant exceeds 100 mm 2 / s, it tends to be difficult to inject the mold lubricant.
  • the kinematic viscosity at 40 ° C. of the mold lubricant is more preferably 2 to 50 mm 2 / s, and further preferably 2 to 20 mm 2 / s.
  • the mold lubricant is injected in the air flow rate, the air pressure, the pressure feeding device such as a gear pump, or the spray coating device. It is preferable to appropriately adjust the diameter of the oil supply holes.
  • the mold opening may be opened when the metal powder is filled into the mold even if the mold lubricant is applied to the mold.
  • the mold lubricating oil tends to come into contact with the metal powder, and agglomerates (so-called lumps) tend to be formed. If an agglomerate is formed in the vicinity of the opening of the mold, the metal powder cannot be filled to the back of the mold, and it tends to be difficult to mold the green compact into a desired shape. Therefore, from the above viewpoint, it is preferable that the kinematic viscosity at 40 ° C. of the mold lubricant is 10 mm 2 / s or less.
  • the kinematic viscosity of the mold lubricant can be measured by, for example, an Ubbelohde viscometer (ASTM D445).
  • an antioxidant in addition to the hydrocarbon solvent, oiliness improver, and extreme pressure agent described later, in the mold lubricant oil, an antioxidant, a metal deactivator, a rust inhibitor, as long as it does not contradict the spirit of the present invention, Or additives, such as an antifoamer, may be contained.
  • the solvent in the mold lubricating oil is a solvent that easily evaporates and does not remain, that is, a highly dry solvent. Also, from the viewpoint of preventing the health hazard of workers, the solvent in the mold lubricating oil has a high content of saturated hydrocarbons and a refinement degree with extremely low sulfur and nitrogen contents. It is preferable that it is a high hydrocarbon solvent.
  • the hydrocarbon solvent used as the solvent for the mold lubricant of the present invention is liquid at room temperature.
  • the hydrocarbon solvent has 7 to 18 carbon atoms, preferably 10 to 15 carbon atoms.
  • the drying property is too high, so that the adhesion to the mold may be deteriorated, and the risk of fire increases.
  • the hydrocarbon solvent has more than 18 carbon atoms, the solvent is difficult to evaporate and the drying property is lowered, and the viscosity of the oil film formed by the oiliness improver and extreme pressure agent described later is reduced to a low viscosity in the solvent. The undried portion is lowered, and the lubricity of the oil film is lowered or galling is caused.
  • hydrocarbon solvent used in the present invention needs to have suitable drying properties, it can be said that any hydrocarbon solvent having suitable drying properties can be used in the present invention.
  • the hydrocarbon solvent having 7 to 18 carbon atoms has particularly suitable drying properties and is particularly suitable as a solvent for the mold lubricating oil.
  • the hydrocarbon solvent is preferably the component having the largest mass in the mold lubricant, that is, the main component.
  • the content of the hydrocarbon solvent is preferably 50 to 98% by mass, more preferably 60 to 98% by mass, and further preferably 60 to 95% by mass with respect to the total amount of the mold lubricating oil. preferable.
  • the content of the hydrocarbon solvent is less than 50% by mass, the blending ratio of the oiliness improver or the extreme pressure agent described later increases, so that the oil film tends to be difficult to dry on the inner wall surface of the mold.
  • the content of the hydrocarbon solvent exceeds 98% by mass, the oil film of the mold lubricating oil becomes thin, so that the lubricity of the mold lubricating oil tends to decrease.
  • the type of hydrocarbon solvent is not particularly limited, and examples thereof include paraffinic hydrocarbon solvents, olefinic hydrocarbon solvents, naphthene hydrocarbon solvents, and aromatic hydrocarbon solvents.
  • Paraffin hydrocarbon solvent is a solvent containing a chain-like saturated hydrocarbon compound that is not cyclic. Compared with other hydrocarbon solvents, it is less likely to cause health problems for workers and changes in viscosity due to temperature. Few. Therefore, by using a paraffinic hydrocarbon solvent as a solvent for the mold lubricant, the mold lubricant can be stably sprayed.
  • paraffinic hydrocarbon solvents have lower reactivity and higher chemical stability than other hydrocarbon solvents. Therefore, by using a paraffinic hydrocarbon solvent as a solvent for the mold lubricating oil, it is difficult for the lubricating components and the like in the mold lubricating oil to be altered.
  • paraffin hydrocarbon solvents are particularly preferable among the hydrocarbon solvents.
  • the type of the paraffinic hydrocarbon solvent is not particularly limited, and examples thereof include alkane solvents such as heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, and pentadecane.
  • the olefinic hydrocarbon solvent is a solvent containing a hydrocarbon compound having a double bond.
  • the type of the olefinic hydrocarbon solvent is not particularly limited, and examples thereof include 1-heptene, 1-octene, 1-nonene, and 1-decene.
  • the naphthenic hydrocarbon solvent is a solvent containing a compound having at least one saturated aliphatic ring in the molecule, and has a property of being more dry than an aromatic hydrocarbon solvent described later.
  • the kind of naphthene type hydrocarbon solvent is not specifically limited, For example, a cyclopentane, a cyclohexane, or cyclooctane etc. are mentioned.
  • the aromatic hydrocarbon solvent is a solvent containing a compound having at least one aromatic ring in the molecule.
  • the kind of aromatic hydrocarbon solvent is not specifically limited, For example, toluene, xylene, etc. are mentioned.
  • hydrocarbon solvent various types of solvents such as petroleum hydrocarbon solvents, hydrocarbon solvents derived from natural products, or chemically synthesized hydrocarbon solvents can be used.
  • hydrocarbon solvent the above solvents may be used alone or in combination. Further, the hydrocarbon solvent may contain additives, impurities and the like as long as they do not contradict the spirit of the present invention.
  • Oiliness improver By adding an oiliness improver to the mold lubricant, the lubricity between the green compact and the mold can be ensured.
  • the oiliness improver is a compound having polarity, and its polar part is physically adsorbed to the mold to form an oil film, so that it acts like a cushioning material between the green compact and the mold, It means a compound that can reduce friction.
  • an oiliness improver is a thing with high affinity with a solvent.
  • the content of the oiliness improver is preferably 20% by mass or less, more preferably 2 to 18% by mass, and further preferably 2 to 15% by mass with respect to the total amount of the mold lubricating oil. preferable.
  • the content of the oiliness improver exceeds 20% by mass, the oil film becomes excessively thick, and voids generated after sintering tend to increase.
  • the kinematic viscosity of the mold lubricating oil increases, and it tends to be difficult to perform stable spray coating.
  • the oiliness improver tends to stick to the sintered body.
  • the content of the oiliness improver is less than 2% by mass, the oil film is not sufficient, which may cause seizure or the like.
  • the type of oiliness improver is not particularly limited, and examples thereof include silicones, animal and vegetable oils and fats, and higher fatty acid esters.
  • the type of silicone is not particularly limited, and examples thereof include modified silicones such as phenol-modified silicone, methylstill-modified silicone, alkyl-modified silicone, and alkylaralkyl-modified silicone, or dimethyl silicone oil.
  • animal and vegetable oils and fats are not particularly limited, and examples thereof include rapeseed oil, soybean oil, coconut oil, palm oil, cow oil, and pork fat.
  • the type of the higher fatty acid ester is not particularly limited, and examples thereof include monohydric alcohol ester or polyhydric alcohol ester of higher fatty acid such as coconut oil fatty acid, oleic acid, stearic acid, lauric acid, palmitic acid, or beef tallow fatty acid. Can be mentioned.
  • oiliness improver the above compounds may be used alone or in combination.
  • oiliness improver may contain additives, impurities, and the like within a range not departing from the spirit of the present invention.
  • an extreme pressure agent additive of an extreme pressure agent to the mold lubricating oil can reduce galling between the green compact and the mold when a high pressure load is applied.
  • An extreme pressure agent forms a soft oil film by a chemical reaction between the green compact and the mold, and reduces direct contact between the green compact and the mold, thereby reducing the green compact.
  • an extreme pressure agent is a thing with high affinity with a solvent.
  • the content of the extreme pressure agent is preferably 20% by mass or less, more preferably 0.5 to 18% by mass, and more preferably 0.5 to 15% by mass with respect to the total amount of the mold lubricating oil. More preferably it is.
  • the content of the extreme pressure agent exceeds 20% by mass, the kinematic viscosity of the mold lubricating oil becomes high, and it tends to be difficult to perform stable spray coating. In addition, the extreme pressure agent tends to stick to the sintered body. If the content of the extreme pressure agent is less than 2% by mass, the oil film may not be sufficient, which may cause seizure or the like.
  • extreme pressure agent is not particularly limited, for example, sulfide sulfide oil such as dialkylpentasulfide, phosphate ester, TCP (tricresyl phosphate), MoDTC (molybdenum dithiocarbamate), ZnDTP (zinc dialkyldithiophosphate), Or MoDTP (molybdenum dithiophosphate) etc. are mentioned.
  • the above compounds may be used alone or in combination.
  • the extreme pressure agent may contain additives, impurities, and the like within a range not departing from the spirit of the present invention.
  • the total amount of the oiliness improver and the extreme pressure agent is preferably 20% by mass or less based on the total amount of the mold lubricating oil, and is 2 to 18% by mass. More preferably, the content is 2 to 15% by mass.
  • the method for applying the mold lubricant of the present invention is not particularly limited, and examples thereof include brush coating, roller coating, and spray coating using a spray coating apparatus.
  • Brush coating or roller coating is suitable from the viewpoint of thickly applying the mold lubricant to the mold, but tends to cause unevenness in the thickness of the oil film formed by the mold lubricant.
  • the mold for forming the green compact is generally small in size, it tends to be difficult to apply by brush coating or roller coating. Therefore, when applying the mold lubricant to the mold, it is preferable to apply the spray by a spray application device.
  • a spray coating apparatus 10 as shown in FIG. 1 can be used as a spray coating apparatus for injecting the above-described mold lubricant.
  • the spray application device 10 includes an oil amount adjusting knob 11, a spring chamber 12, a spring 13, a fixing ring 14, a needle 15, a needle receiver 16, a spray body 18, a spray nozzle 19, a spray nozzle cap 20, an air supply path 21, and an air branch. It has a passage 22, an air supply hole 23, an oil supply hose 31, an oil supply pipe 32, an oil supply hole 33, and the like.
  • the needle 15 has a needle small diameter portion 15S, a needle large diameter portion 15L, a needle inclined portion 15I, and a needle tip portion 15T.
  • the needle narrow diameter portion 15S is connected to the needle large diameter portion 15L
  • the needle inclined portion 15I is connected to the needle tip portion 15T, and each is arranged substantially linearly.
  • the diameter of the needle small diameter portion 15S is about 3.0 mm
  • the diameter of the needle large diameter portion 15L is about 10.0 mm
  • the diameter of the needle tip portion 15T is about 0.65 mm.
  • the needle receiver 16 has a needle receiver 16S and a needle receiving hole 16P.
  • the oil amount adjustment knob 11 is a knob for controlling the oil amount to be constant.
  • the oil amount adjusting knob 11 is provided with a spring chamber 12, and a spring 13 is incorporated in the spring chamber 12.
  • the spring 13 is provided so as to be wound around the needle small diameter portion 15S, and is configured to compensate for the vertical movement of the needle 15.
  • the load when the spring 13 is used is preferably 1.0 to 3.0N.
  • the oil amount adjusting knob 11 After adjusting the oil amount to be injected with the oil amount adjusting knob 11, the oil amount adjusting knob 11 is fixed with the fixing ring 14. By fixing the oil amount adjustment knob 11 with the fixing ring 14, the oil amount for each injection can be made constant.
  • the needle 15 has a needle inclined portion 15I constituted by a substantially truncated cone-shaped inclined portion
  • the needle receiving portion 16 has a needle receiving portion 16S constituted by a substantially truncated cone-shaped inclined portion.
  • the needle 15 and the needle receiving portion 16 can be substantially fitted in the needle inclined portion 15I and the needle receiving portion 16S, and a mold lubricating oil is provided between the substantially fitted needle inclined portion 15I and the needle receiving portion 16S. Can pass through.
  • the angle formed by the substantially truncated cone-shaped inclined portion in the needle inclined portion 15I is preferably 20 to 40 degrees. Further, the angle formed by the substantially truncated cone-shaped inclined portion in the needle receiving portion 16S is preferably ⁇ 5 to ⁇ 1 degree with respect to the angle formed by the substantially truncated cone-shaped inclined portion in the needle inclined portion 15I. In the needle inclined portion 15I and the needle receiving portion 16S, each substantially truncated cone-shaped inclined portion has the above-described angle relationship, so that it becomes easy to finely adjust the amount of the mold lubricant to be injected.
  • the spray coating apparatus 10 includes a needle tip portion 15T formed on the narrowed side of the substantially truncated cone-shaped inclined portion in the needle inclined portion 15I, and a narrowed side of the substantially truncated cone-shaped inclined portion in the needle receiving portion 16S. And a needle receiving hole 16P connected thereto. Further, the needle receiving hole 16P is connected to an oil supply pipe 32 that supplies mold lubricating oil into the spray coating device 10 on the side facing the needle receiving portion 16S, and the needle receiving hole 16P and the needle tip portion 15T are connected to each other. Is substantially matable.
  • the diameter of the needle receiving hole 16P is preferably 0.6 to 1.8 mm, and the diameter of the needle tip 15T is 0.5 to 1.7 mm. It is preferable that Further, the difference between the diameter of the needle receiving hole 16P and the diameter of the needle tip 15T is preferably 0.05 to 0.4 mm. When the needle receiving hole 16P and the needle tip portion 15T satisfy the above conditions, a small amount of mold lubricating oil tends to be easily applied.
  • the needle receiving hole 16P is connected to the oil supply pipe 32 as described above, and forms a part of the oil supply pipe 32.
  • An oil supply hose 31 for supplying mold lubricant is connected to an oil supply pipe 32.
  • a needle receiving hole 16 ⁇ / b> P that forms part of the oil supply pipe 32 is connected to an oil supply hole 33 provided in the injection nozzle 19.
  • An air supply path 21 for supplying air is connected to an air branch path 22 and an air supply hole 23.
  • the air supply hole 23 is preferably provided with an inclination of 20 to 40 degrees with respect to the central axis of the injection nozzle 19.
  • the fitting state between the needle 15 and the needle receiver 16 changes.
  • the amount of mold lubricating oil supplied per unit time supplied from the needle receiving hole 16P (oil supply pipe 32) to the oil supply hole 33 increases.
  • the amount of mold lubricating oil supplied from the oil supply hole 33 can be slightly increased.
  • Rotating the oil amount adjusting knob 11 counterclockwise moves the spring chamber 12 toward the needle large diameter portion 15L while rotating counterclockwise.
  • the spring 12 incorporated in the spring chamber 12 contracts.
  • the needle large diameter portion 15L moves to the needle receiver 16 side.
  • the fitting state between the needle 15 and the needle receiver 16 changes.
  • the supply amount of the mold lubricating oil per unit time supplied from the needle receiving hole 16P (oil supply pipe 32) to the oil supply hole 33 decreases.
  • the amount of mold lubricant supplied from the oil supply hole 33 can be slightly reduced.
  • Air is introduced into the spray body 18 from the air supply path 21.
  • a solenoid valve is used for the air introduction operation.
  • the air pressure of the supplied air is preferably 3 MPa or more. In order to prevent the air pressure from becoming too high, it is preferable to adjust to an appropriate air pressure using a regulator or the like.
  • the hydraulic pressure of the mold lubricating oil is preferably 0.1 to 1.0N.
  • the air supplied from the air supply path 21 is also supplied to the needle large diameter portion 15L side through the air branch path 22. Due to the pressure of the air supplied from the air branch path 22, the needle large diameter portion 15 ⁇ / b> L moves to the side opposite to the needle receiver 16 side. This mechanism also finely adjusts the amount of mold lubricant supplied.
  • the air supplied from the air supply path 21 is jetted toward the outside of the spray body 18 through the air supply hole 23 and the air jet groove 24.
  • air supply holes 23 are provided around the oil supply hole 33 (in FIG. 2, 23a, 23b, 23c, 23d, 23e, And 23f).
  • the air supply hole 23 and the oil supply hole 33 are arranged at a twisted position, and the angle formed by the air supply hole 23 and the oil supply hole 33 is measured from a direction perpendicular to a substantially plane including one air supply hole 23.
  • the angle formed by the air supply hole 23 and the oil supply hole 33 is preferably 20 to 40 degrees.
  • the angle formed with the oil supply hole 33 is preferably 20 to 40 degrees.
  • the air supplied from the air supply passage 21 passes through the air supply hole 23 provided in the injection nozzle 19 and then flows through the gap (0.3 to 1.5 mm) between the injection nozzle 19 and the injection nozzle cap 20. It is ejected from the ejection groove 24 while swirling.
  • the vicinity of the oil supply hole 33 is in a vacuum state, so that the air draws the mold lubricating oil from the oil supply hole 33. Therefore, the air and the mold lubricant are mixed to form a mist and sprayed onto the mold 70.
  • the injection amount of the mold lubricating oil be a minute amount from the viewpoint of easily drying the solvent of the mold lubricating oil.
  • the injection amount of the mold lubricant is preferably 0.01 to 10 ml / time, more preferably 0.05 to 5 ml / time. If the injection amount of the mold lubricating oil is less than 0.01 ml / time, the formation of an oil film becomes insufficient, which tends to cause galling. When the injection amount of the mold lubricant exceeds 10 ml / time, the solvent of the mold lubricant tends to be difficult to evaporate.
  • the spray coating apparatus 10 can inject not only oil-based mold lubricants but also general mold lubricants including water-based ones.
  • the type of metal powder 50 that can be applied to the green compact molding apparatus of the present invention is not particularly limited.
  • metals such as alloy steels.
  • a mixture of the above metals or a mixture of the above metals containing carbon for enhancing the sintering strength or surface hardening can be used.
  • the green compact molding apparatus for molding the metal powder 50 filled in the mold 70 into the green compact 51 includes an application means for applying the mold lubricating oil by the spray coating apparatus 10 and a mold having the mold lubricating oil applied thereto.
  • Filling means for filling the mold 70 with the metal powder 50, scraping means for scraping the metal powder 50 existing above the mold 70 out of the metal powder 50 filled in the mold 70, and the filled metal powder 50 Forming means for pressing to form the green compact 51, extracting means for extracting the formed green compact 51 above the mold 70, and paying out the extracted green compact 51 from the top of the mold 70 Means.
  • the filling means is provided behind the application means, and the dispensing means is provided ahead of the application means.
  • the scraping means is provided behind the applying means and ahead of the filling means.
  • the dispensing means, the application means, the scraping means, and the filling means are arranged in this order, and the feeder 40 extends back and forth above the die plate 60 along the arrangement direction. It is a slidable aspect.
  • the spray application device 10 constitutes the application means
  • the feeder 40 constitutes a part of the feeder 40
  • the abrasion means 42 constitutes the abrasion means
  • the molding means serves as the mold 70 and the upper punch 91 and The lower punch 92 is configured
  • the lowering punch 92 is configured as the extracting means
  • the discharging unit 43 is configured as the discharging means.
  • the grounding surface side to the die plate 60 of the feeder 40 is opened, and the entire surface on the grounding surface side forms a falling part of the metal powder 50, thereby constituting a filling means.
  • the falling part of the metal powder 50 may be an aspect in which the entire ground surface side to the die plate 60 is opened as in this embodiment, or a part of the ground surface side forms an opening. It may be a mode.
  • the upper part of the outer wall 41 constituting the feeder 40 may be partially configured with a transparent member so that the remaining amount of the metal powder 50 inside the feeder 40 can be confirmed, or opened without providing any member. Also good.
  • a part of the outer wall 41 on the grounding surface side to the die plate 60 forms a shape like a frame portion, and the metal powder 50 is held in the frame portion, and the metal powder 50 moves on the die plate 60 together with the feeder 40. It is a mode that can slide back and forth.
  • the feeder 40 having the dispensing means, the spray coating device 10, and the filling means is a dispensing direction that is a direction toward the upper portion of the mold 70 in a state before the dispensing on the substantially flat die plate 60, that is, an arrow 40a. Slides in conjunction with the direction. Note that the state before dispensing means a state from when the green compact is formed to before the green compact is dispensed.
  • the spray coating device 10 When the spray nozzle 19 of the spray coating device 10 provided in front of the feeder 40 is positioned above the mold 70, the spray coating device 10 sends a signal for opening the electromagnetic valve of the air supply path 21. Received from the compacting device. When the solenoid valve of the air supply path 21 is opened, air flows into the air supply path 21 and the air branch path 22 shown in FIG. 1, the needle 15 is pushed up, and a gap is formed in the needle receiving portion 16. As a result, the spray coating apparatus 10 can inject the mold lubricating oil onto the mold 70. By this step, an oil film 80 of mold lubricating oil is formed on the inner wall surface of the mold 70.
  • the timing control method for injecting the mold lubricant from the spray coating apparatus 10 is to be injected at a predetermined timing by a sensor that senses that a predetermined portion such as the feeder 40 exists at a predetermined position.
  • a method is mentioned.
  • the metal powder 50 is carried to the upper part of the mold 70 by the frame portion formed by the outer wall 41 of the feeder 40. Since the grounding surface side of the feeder 40 is opened to form a falling portion of the metal powder 50, a part of the metal powder 50 inside the feeder 40 falls in the direction of the arrow 50b, and the mold 70 Filled in.
  • Step C (Scraping mechanism)
  • the feeder 40 slides on the substantially flat die plate 60 in the direction of the arrow 40c.
  • the scraping portion 42 formed in front of the frame portion of the outer wall 41 scrapes the upper portion of the metal powder 50 filled in the mold 70 along the upper surface of the substantially flat die plate 60.
  • Step E (Extraction mechanism) After molding the green compact 51, the upper punch 91 moves in the direction of the arrow 91e.
  • the lower punch 92 moves in the direction of the arrow 92e until the upper surface of the lower punch 92 is positioned on the upper surface of the die plate 60, and moves the green compact 51 to the upper surface of the die plate 60.
  • step E step A is performed again, and the mold lubricant is again sprayed from the spray application device 10 to the mold 70.
  • the feeder 40 reciprocates alternately in the steps A to E, so that the mold lubricant can be repeatedly applied to the mold, and the green compacts that are sequentially formed can be dispensed.
  • step A to step E can be performed in about 6 seconds per cycle. Therefore, by using the mold lubricating oil, spray coating apparatus, and green compact molding apparatus of the present invention, spray coating of mold lubricating oil, filling metal powder into the mold, compacting of green compact, compacting The body can be dispensed at high speed. ⁇ Production of sintered body>
  • the green compact produced as described above can be made into a sintered body by sintering in a large number in a furnace.
  • the process A to the process E cycle that is, the steps of spray application of mold lubricant, filling of metal powder into the mold, molding of green compact, and discharge of green compact are performed. It becomes a rate-limiting process. Therefore, by speeding up the above process, the production of the sintered body can be speeded up.
  • the cycle of Step A to Step E can be performed in about 6 seconds per cycle, but the cycle time is increased by 16 to 50% just by delaying this cycle by about 1 to 3 seconds. Further, if troubles such as galling occur in the cycle of Step A to Step E, the production of the green compact cannot be continued, which causes a serious hindrance to the production of the sintered body.
  • Step A to Step E for example, a powder mold lubricant is used, a mold lubricant that cannot form a uniform and uniform oil film is used, or a solvent that does not easily evaporate is used for the mold lubricant. Then, the cycle time becomes long or troubles such as galling occur, and the production efficiency of the sintered body tends to be greatly reduced.
  • time lag between spray application of mold lubricant and filling metal powder into mold time lag between filling metal powder into mold and compacting, or compacting
  • the cycle time becomes longer, and the production efficiency of the sintered body tends to be greatly reduced.
  • the blending amount of the mixed lubricant with respect to the metal powder is preferably 0.05% by mass or more, and more preferably 0.1 or more. Further, the blending amount of the mixed lubricant with respect to the metal powder is preferably 0.6% by mass or less, more preferably 0.5% by mass or less, and further preferably 0.4% by mass or less. The content is particularly preferably 0.3% by mass or less.
  • the mixed lubricant blended in the metal powder is less than 0.05% by mass, the apparent density of the metal powder blended with the mixed lubricant tends to be low.
  • the metal powder is preferably difficult to rearrange from filling to the initial stage of compression, the density of the green compact tends to not increase. That is, the friction between the particles of the metal powder is increased, the fluidity of the metal powder is deteriorated, and the compressibility of the green compact tends to be lowered.
  • blended with a metal powder exceeds 0.6 mass%, it exists in the tendency for a mixed lubricant to inhibit compression and to raise the density of a green compact. That is, the mixed lubricant remains in the metal powder, and the compressibility of the green compact tends to be difficult to improve.
  • the type of the mixed lubricant is not particularly limited, and examples thereof include metal soaps such as zinc stearate and lithium stearate, and amide type lubricants such as stearic acid amide, stearic acid bisamide, and ethylene bisstearamide.
  • the lubricity between the mold and the metal powder can be improved by using a mold lubricant that is easy to dry and can form a uniform and uniform oil film with a small amount of coating. It can be maintained, and the effect of preventing galling is also enhanced. Therefore, the amount of the mixed lubricant mixed with the metal powder can be reduced by about 75%. As a result, the fluidity of the metal powder can be maintained when the metal powder is filled into the mold in the green compact molding step. Further, since the green compact becomes dense, the density of the green compact tends to be improved. Furthermore, since voids generated by removing the mixed lubricant during sintering can be minimized, the density of the final sintered body can be increased.
  • a sintered body having a high density has excellent physical properties in terms of rotational bending fatigue strength, crushing strength, dimensional accuracy, tensile strength, hardness, wear resistance, and the like.
  • a sintered body having a high density can be suitably used, for example, for gears and clutch parts of a reduction mechanism used for electric tools, electromagnetic materials that are often used in the field of automobiles and home appliances, and the like.
  • the mold lubricating oil of the present invention will be described in detail using Examples and Comparative Examples.
  • the present invention is not limited to the following embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention.
  • Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. Some components may be deleted from all the components shown in the embodiments. Furthermore, the constituent elements may be appropriately combined so as to be different embodiments.
  • Example 1 Provide of mold lubricant> Solvent G as a hydrocarbon solvent (ExxonMobil Corp., Isoper-G; isoalkane mixture having 9 to 12 carbon atoms) 90% by mass, and oiliness improver A (Shin-Etsu Chemical Co., Ltd., X22-1877; modified silicone) A mold lubricating oil was obtained by mixing 10% by mass.
  • Solvent G as a hydrocarbon solvent (ExxonMobil Corp., Isoper-G; isoalkane mixture having 9 to 12 carbon atoms) 90% by mass, and oiliness improver A (Shin-Etsu Chemical Co., Ltd., X22-1877; modified silicone)
  • a mold lubricating oil was obtained by mixing 10% by mass.
  • Examples 2 to 4 and Comparative Examples 1 to 5 A mold lubricating oil was prepared in the same manner as in Example 1 except that a hydrocarbon solvent and an oiliness improver or extreme pressure agent were blended with the composition shown in Table 3.
  • the hydrocarbon solvent, oiliness improver, and extreme pressure agent used are as shown in Table 1 or 2.
  • the mold lubricating oil obtained in the examples or comparative examples was poured into a Ubbelohde viscometer (U-1B-255, manufactured by Yoshida Scientific Instruments Co., Ltd.) and vertically placed in a constant temperature bath maintained at 40 ° C. for 10 minutes. Left to stand. Measure the time (seconds) that the lubricant meniscus (bending of the liquid level) passes from the time mark E to F with a stopwatch, and the measured value (seconds) and the viscometer constant of the Ubbelohde viscometer used The kinematic viscosity of the mold lubricant was measured by multiplying (inherent value). Table 3 shows the measurement results of the kinematic viscosity of the mold lubricant.
  • ⁇ Evaluation of safety of mold lubricant> In consideration of the flammability of the solvent, the safety of the mold lubricant was evaluated in three stages in the order of “excellent”, “good”, and “impossible”. Table 3 shows the safety evaluation results of the mold lubricant.
  • a main component means what has the largest content rate among composition components. Excellent: The flash point of the main component is 95 ° C. or higher. Good: The flash point of the main component is higher than 30 ° C. and lower than 95 ° C. No: The flash point of the main component is 30 ° C. or lower.
  • the mold lubricating oil obtained in Comparative Example 1 was evaluated as “excellent” because the solvent E dried quickly and formed a lubricating film. However, since the flash point of solvent E is ⁇ 24 ° C., the mold lubricant is flammable and dangerous, and thus the safety evaluation was “impossible”.
  • the mold lubricant obtained in Comparative Example 2 had a short rupture time, a high average dynamic friction coefficient, and poor lubrication performance.
  • the mold lubricant obtained in Comparative Example 4 had a low drying property and could not form a uniform oil film.
  • the mold lubricant obtained in Comparative Example 3 or 5 had a high kinematic viscosity and could not be applied in a small amount by spraying.
  • the blending amount of the mixed lubricant is preferably 0.6% by mass or less.
  • the blending amount of the mixed lubricant is 0% by mass, the apparent density is lowered, and the density of the green compact may be difficult to increase. Therefore, it can be said that it is preferable to add 0.05 to 0.6 mass% of the mixed lubricant to the metal powder. Further, it is more preferable to add 0.1 to 0.6% by mass of the mixed lubricant to the metal powder, and it is more preferable to add 0.1 to 0.4% by mass of the mixed lubricant.
  • Example 1 The mold lubricant obtained in Example 1 was applied by spraying 0.1 ml onto a mold having a diameter of 16 cm and a depth of 30 cm using the spray coating apparatus shown in FIG. The gun distance from the nozzle tip of the spray coating device to the mold was 3 mm.
  • air supply holes are provided around the oil supply hole.
  • the air supply hole and the oil supply hole are arranged at twisted positions, and the angle formed by the air supply hole and the oil supply hole measured from a direction perpendicular to a substantially plane including one air supply hole is 30 degrees. Yes. That is, when the air supply hole and the oil supply hole are viewed from the position where the end on the air supply path side of one air supply hole appears to overlap the oil supply hole, the angle formed by the air supply hole and the oil supply hole is It is 30 degrees.
  • the diameter of the needle receiving hole is 0.65 mm
  • the diameter of the needle tip is 0.8 mm
  • the diameter of the needle receiving hole and the diameter of the needle tip The difference is 0.075 mm.
  • the angle formed by the substantially truncated cone-shaped inclined portion in the needle inclined portion is 25 degrees
  • the angle formed by the substantially truncated cone-shaped inclined portion in the needle receiving portion is the angle of the substantially truncated cone-shaped inclined portion in the needle inclined portion. It is -2 degrees with respect to the formed angle.
  • the metal powder obtained in Production Example 1 was filled in a mold, and the green compact was molded at 40 ° C.
  • the load pressure at the time of compacting the green compact was 1000 MPa.
  • the time required from the injection of the mold lubricant to the discharge of the green compact, that is, the cycle time was 6 seconds on average.
  • Example 5 A mold lubricating oil was produced in the same manner as in Example 1 except that a hydrocarbon solvent and an oiliness improver or extreme pressure agent were blended with the composition shown in Table 6.
  • the hydrocarbon solvent, oiliness improver, and extreme pressure agent used in the production of the mold lubricant are as shown in Table 1 or 2.
  • a green compact was molded by the same method as in Example 1, and various physical properties were evaluated.
  • Table 6 shows the compositions of the mold lubricants obtained in Examples 5 to 8 and the evaluation results of various physical properties.
  • Example 5 in which the extreme pressure agent A was blended in an amount of 0.1% by mass, the compressibility and punching pressure of the green compact were about the same as in Example 1.
  • Example 6 in which 0.5% by mass of the extreme pressure agent A was blended, the punching pressure was lower than in Example 1 and Example 5.
  • Example 7 Compared with Example 5 using only solvent G as the solvent, in Example 7 using equal amounts of solvent G and solvent I as the solvent, the release pressure was higher. Compared with Example 5 using only the solvent G as a solvent, also in Example 8 using only the solvent I as a solvent, the extraction pressure became high.
  • Reference Example 2 A green compact was molded in the same manner as in Reference Example 1 except that 0.1 ml of the mold lubricant obtained in Example 1 was applied to the mold in the same manner as in Example 1.
  • Reference Example 5 and Reference Example 6 have compressibility when the mold lubricant is applied and when it is not applied when the blending amount of the mixed lubricant is 0.2 mass% and the load pressure is 600 MPa. And the extraction pressure are compared. Compared with the compressibility (6.93 g / cm 3 ) of Reference Example 5 in which the mold lubricant was not applied, the compressibility (7.0 g / cm 3 ) of Reference Example 6 in which the mold lubricant was applied was It became high. Moreover, the extraction pressure (27.17 MPa) of Reference Example 6 to which the mold lubricant was applied was lower than the extraction pressure (32.08 MPa) of Reference Example 5 to which the mold lubricant was not applied.
  • the green compact was prepared in the same manner as in Reference Example 7 except that the amount of the mixed lubricant blended in the metal powder was 0.5% by mass, and a load pressure at which the compressibility was 7.2 g / cm 3 or more was applied. Molding was performed.
  • the green compact was prepared in the same manner as in Reference Example 8 except that the amount of the mixed lubricant blended in the metal powder was 0.5 mass% and a load pressure at which the compressibility was 7.2 g / cm 3 or more was applied. Molding was performed.
  • the load pressure at which the density of Reference Example 11 and Reference Example 12 was 7.2 or more was not significantly different between Reference Example 11 where the mold was not applied and Reference Example 12 where the mold was applied.
  • the extraction pressure (17 MPa) of Reference Example 12 in which the mold lubricant was applied was reduced compared to the extraction pressure (27 MPa) of Reference Example 11 in which the mold was not applied. From this, it was confirmed that the punching pressure can be reduced by applying the mold lubricant.
  • Reference Example 18 A green compact was molded in the same manner as in Reference Example 14 except that the metal powder obtained in Production Example 4 was used in place of the metal powder obtained in Production Example 1. The obtained green compact was sintered by the same method as in Reference Example 14 to obtain a sintered body.
  • Reference Example 20 A green compact was formed in the same manner as in Reference Example 16 except that the metal powder obtained in Production Example 4 was used instead of the metal powder obtained in Production Example 1. The obtained green compact was sintered by the same method as in Reference Example 16 to obtain a sintered body.
  • the density, crushing strength, and estimated gas amount of the sintered bodies obtained in Reference Examples 14 to 20 were measured in the same manner as in Reference Example 13.
  • Table 10 shows the measurement results of the density, the crushing strength, and the estimated gas amount of the sintered bodies obtained in Reference Examples 14 to 20.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Lubricants (AREA)

Abstract

Le problème décrit par la présente invention a pour objet d'obtenir un moulage à grande vitesse de produits agglomérés et le moulage de produits agglomérés de formes arbitraires au moyen de la fourniture d'une huile lubrifiante de moule ayant d'excellentes propriétés de séchage rapide et pouvant former un film d'huile régulier et uniforme par revêtement d'une petite quantité de cette dernière, un dispositif de revêtement par pulvérisation, et un appareil de moulage de produits agglomérés. La solution selon la présente invention se rapporte à une huile lubrifiante de moule qui comprend un solvant hydrocarboné en C7-18 et un agent d'onctuosité ou un agent de pression extrême. La présente invention est de préférence, une huile lubrifiante de moule dans laquelle la teneur du solvant hydrocarboné est de 50-98 % en masse.
PCT/JP2016/071651 2015-07-24 2016-07-24 Huile lubrifiante de moule de production d'un corps fritté de densité élevée, dispositif de revêtement par pulvérisation pour huile lubrifiante de moule, appareil de moulage de produits agglomérés équipé d'un dispositif de revêtement par pulvérisation, procédé de moulage de produits agglomérés utilisant l'appareil, et corps fritté obtenu par le procédé Ceased WO2017018365A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017530849A JPWO2017018365A1 (ja) 2015-07-24 2016-07-24 高密度の焼結体を生産するための金型潤滑油、金型潤滑油のスプレー塗布装置、スプレー塗布装置を備えた圧粉体成形装置、それを用いた圧粉体成形方法、およびその方法によって得られる焼結体

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-147214 2015-07-24
JP2015147214 2015-07-24

Publications (1)

Publication Number Publication Date
WO2017018365A1 true WO2017018365A1 (fr) 2017-02-02

Family

ID=57884437

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/071651 Ceased WO2017018365A1 (fr) 2015-07-24 2016-07-24 Huile lubrifiante de moule de production d'un corps fritté de densité élevée, dispositif de revêtement par pulvérisation pour huile lubrifiante de moule, appareil de moulage de produits agglomérés équipé d'un dispositif de revêtement par pulvérisation, procédé de moulage de produits agglomérés utilisant l'appareil, et corps fritté obtenu par le procédé

Country Status (3)

Country Link
JP (1) JPWO2017018365A1 (fr)
TW (1) TWI703209B (fr)
WO (1) WO2017018365A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2016152778A1 (ja) * 2015-03-20 2017-11-02 日立化成株式会社 押型法による成形体の成形方法
CN112530654A (zh) * 2020-12-04 2021-03-19 安徽中马磁能科技股份有限公司 一种烧结永磁铁氧体及其成型方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63111243U (fr) * 1987-01-14 1988-07-16
JPH04134453U (ja) * 1991-05-31 1992-12-15 扶桑精機株式会社 噴霧装置
JPH10279977A (ja) * 1997-04-04 1998-10-20 Sugimura Kagaku Kogyo Kk 高潤滑防錆油組成物
JP2002321033A (ja) * 2001-04-24 2002-11-05 Showa Denko Kk 鍛造用金型への潤滑剤塗布用ノズル、潤滑剤塗布装置、潤滑剤塗布方法、鍛造装置および鍛造方法。
WO2009022629A1 (fr) * 2007-08-10 2009-02-19 Japan Energy Corporation Agent de traitement de surface, procédé de traitement de surface et composant mécanique
JP2011206839A (ja) * 2010-03-30 2011-10-20 Sumitomo Bakelite Co Ltd 成形体製造装置および成形体の製造方法
JP2013248591A (ja) * 2012-06-04 2013-12-12 Yamaguchi Giken:Kk 自動スプレーガン
JP2014220373A (ja) * 2013-05-08 2014-11-20 信越化学工業株式会社 希土類焼結磁石の製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63111243U (fr) * 1987-01-14 1988-07-16
JPH04134453U (ja) * 1991-05-31 1992-12-15 扶桑精機株式会社 噴霧装置
JPH10279977A (ja) * 1997-04-04 1998-10-20 Sugimura Kagaku Kogyo Kk 高潤滑防錆油組成物
JP2002321033A (ja) * 2001-04-24 2002-11-05 Showa Denko Kk 鍛造用金型への潤滑剤塗布用ノズル、潤滑剤塗布装置、潤滑剤塗布方法、鍛造装置および鍛造方法。
WO2009022629A1 (fr) * 2007-08-10 2009-02-19 Japan Energy Corporation Agent de traitement de surface, procédé de traitement de surface et composant mécanique
JP2011206839A (ja) * 2010-03-30 2011-10-20 Sumitomo Bakelite Co Ltd 成形体製造装置および成形体の製造方法
JP2013248591A (ja) * 2012-06-04 2013-12-12 Yamaguchi Giken:Kk 自動スプレーガン
JP2014220373A (ja) * 2013-05-08 2014-11-20 信越化学工業株式会社 希土類焼結磁石の製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2016152778A1 (ja) * 2015-03-20 2017-11-02 日立化成株式会社 押型法による成形体の成形方法
CN112530654A (zh) * 2020-12-04 2021-03-19 安徽中马磁能科技股份有限公司 一种烧结永磁铁氧体及其成型方法
CN112530654B (zh) * 2020-12-04 2023-09-26 安徽中马磁能科技股份有限公司 一种烧结永磁铁氧体及其成型方法

Also Published As

Publication number Publication date
TW201712109A (zh) 2017-04-01
JPWO2017018365A1 (ja) 2018-05-17
TWI703209B (zh) 2020-09-01

Similar Documents

Publication Publication Date Title
US8764897B2 (en) Oil type release agent for die casting method for getting solvent mixing ratio, casting method, and spray unit
JP4829830B2 (ja) 鍛造用油性潤滑剤、鍛造方法及び塗布装置
EP3117926B1 (fr) Agent de démoulage à haute température et résistant à la chaleur à base d'huile et son procédé d'application
JPH04236300A (ja) プランジャー装置用粉末潤滑剤
US9149869B2 (en) Mixed powder for powder metallurgy and process for producing same
CN106660118B (zh) 新产品
WO2017018365A1 (fr) Huile lubrifiante de moule de production d'un corps fritté de densité élevée, dispositif de revêtement par pulvérisation pour huile lubrifiante de moule, appareil de moulage de produits agglomérés équipé d'un dispositif de revêtement par pulvérisation, procédé de moulage de produits agglomérés utilisant l'appareil, et corps fritté obtenu par le procédé
JP2019077950A (ja) 押型法による成形体の成形方法
JP7501521B2 (ja) 潤滑剤、粉末混合物及び焼結体の製造方法
EP2492336A1 (fr) Composition d'huile lubrifiante pour matriçage et dispositif de matriçage
JP6262078B2 (ja) 粉末冶金用混合粉末
WO2014026276A1 (fr) Techniques utilisant un composite lubrifiant pour la fabrication de pièces à partir de poudre métallique
US20080019859A1 (en) Lubricants For Insulated Soft Magnetic Iron-Based Powder Compositions
WO2019230259A1 (fr) Mélange de poudres destiné à la métallurgie des poudres et procédé de production de mélange de poudres destiné à la métallurgie des poudres
JP2010156059A (ja) 温間金型潤滑成形用鉄基粉末混合物
JP7683689B2 (ja) 潤滑剤の組み合わせ、粉末混合物、粉末混合物用原料の組み合わせ及び焼結体の製造方法
JP5588318B2 (ja) 油性型プランジャー潤滑剤組成物
JP2007326145A (ja) ダイカスト油性離型剤
JP2009024049A (ja) 油系温・熱間鍛造用潤滑剤
US20070248483A1 (en) Method for Molding Powder in Powder Metallurgy and Method for Producing Sintered Parts
da Costa Gonçalves et al. Self-lubricating sintered composites with hexagonal boron nitride and graphite mixtures as solid lubricants
St-Laurent et al. Design of high efficiency lubricants for challenging PM applications
JP5707637B2 (ja) エアゾール組成物
WO2020066927A1 (fr) Poudre mélangée pour métallurgie des poudres et lubrifiant pour métallurgie des poudres
JP2018048381A (ja) 焼結部品の製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16830470

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2017530849

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16830470

Country of ref document: EP

Kind code of ref document: A1