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WO2017017863A1 - 鋳鉄鋳物、鋳鉄鋳物の製造方法、及び、鋳鉄鋳物製造設備 - Google Patents

鋳鉄鋳物、鋳鉄鋳物の製造方法、及び、鋳鉄鋳物製造設備 Download PDF

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Publication number
WO2017017863A1
WO2017017863A1 PCT/JP2015/083213 JP2015083213W WO2017017863A1 WO 2017017863 A1 WO2017017863 A1 WO 2017017863A1 JP 2015083213 W JP2015083213 W JP 2015083213W WO 2017017863 A1 WO2017017863 A1 WO 2017017863A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
casting
cast iron
iron casting
suction device
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/JP2015/083213
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大羽　崇文
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.)
Sintokogio Ltd
Original Assignee
Sintokogio 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 Sintokogio Ltd filed Critical Sintokogio Ltd
Priority to US15/747,065 priority Critical patent/US20180369900A1/en
Priority to KR1020187003443A priority patent/KR20180034470A/ko
Priority to EP15899695.9A priority patent/EP3326733B1/en
Priority to JP2017510700A priority patent/JP6586994B2/ja
Priority to CN201580003017.5A priority patent/CN106559990B/zh
Priority to RU2018103953A priority patent/RU2710612C2/ru
Publication of WO2017017863A1 publication Critical patent/WO2017017863A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/06—Melting-down metal, e.g. metal particles, in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D30/00—Cooling castings, not restricted to casting processes covered by a single main group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D47/00—Casting plants
    • B22D47/02—Casting plants for both moulding and casting

Definitions

  • the present invention relates to a cast iron casting, a cast iron casting manufacturing method, and a cast iron casting manufacturing facility.
  • Patent Document 1 discloses that after the surface of a steel product is cleaned and activated, plating is performed by applying a catalyst that promotes a reduction reaction.
  • Patent Document 2 a pure Fe thin plate is attached to the surface of a mold in contact with a casting, molten spherical graphite cast iron is cast into the mold, and the pure Fe thin plate on the mold surface is melted to form graphite on the surface of the casting. It is disclosed that after forming a hindering surface layer, galvanization is performed.
  • Patent Document 3 ultrasonic vibration is applied in a state in which the cast iron material is immersed in the plating solution, the surface of the cast iron material is washed, the graphite existing on the surface is crushed, and dispersed in the plating solution. It is disclosed to form a plating film containing graphite dispersed on its surface.
  • Non-Patent Document 1 suggests that carbon monoxide and carbon dioxide generated by oxidation of graphite in the vicinity of the casting surface in the glazing treatment on cast iron are the cause of bubble defects.
  • Non-Patent Document 2 the metal structure in which defects are generated is graphite that is gradually cooled and enlarged, and conversely, that is rapidly cooled to prevent the growth of graphite. To improve these structures, it is disclosed that it is effective to perform a degassing heat treatment before the soot treatment.
  • Non-Patent Document 3 there are many defects in places of coarse graphite structure, places where redebrite is crystallized, places where cementite is decomposed due to temperature rise during the soot treatment and temper carbon is crystallized, To improve this, low carbon saturation prevents the coarsening of graphite and increases the phosphorus content to prevent crystallization of redebrite and suppress the decomposition of cementite during the soot treatment. It is disclosed that by performing a degassing heat treatment on the cast material before the slag treatment, bubble defects are significantly suppressed.
  • Patent Documents 4 and 5 in the production of enameled cast iron, the one in which a graphite-free layer is formed on the cast iron surface structure has few bubble defects, and the cast iron of flake graphite cast iron having a low carbon and high silicon composition has bubble defects. It is disclosed that the occurrence of bubble defects can be reduced by adding titanium even when the composition is low, and the composition is high carbon and low silicon.
  • the method of forming a graphite-free layer in the vicinity of the casting surface by pouring with a pure Fe thin plate attached to the mold surface in contact with the molten metal is formed in advance according to the shape of the thin plate, It will be necessary to paste it on. For this reason, the applicable shapes are limited to simple ones, and there is a problem that productivity is reduced by operations such as attaching a thin plate.
  • the method of forming a graphite-free layer near the casting surface by controlling the chemical composition of the casting and adding an alloy limits the application range of the product. Therefore, this method is adopted depending on the required specifications. It is impossible.
  • the metal structure and mechanical properties of the casting produced by creating an air flow near the casting there are known techniques for improving the above.
  • the shielding member is closely attached to the shielding surface of the original shape member, the inside or outside of the shielding member is filled with the heat-resistant particulate matter, and the shielding member is made with a negative pressure on the heat-resistant particulate matter side.
  • a casting method that adsorbs to the heat-resistant particle material side, then molds the original member to form a cavity, and pours the molten metal into the cavity, the surface layer of the molten metal after the pouring of the molten metal is completed.
  • a casting method is disclosed in which air is introduced into the heat-resistant particles when the solidification starts.
  • Patent Document 7 the molten metal is poured into a mold made using dry silica sand, and after the injected molten metal has solidified, air is passed through the dry silica sand surrounding the casting material formed by solidification of the molten metal.
  • a casting method characterized by cooling the casting material is disclosed.
  • the present invention has been made in view of the above-mentioned problems, and without subjecting the productivity and cost to increase, a plating process or a glazing process having no defects on the surface thereof regardless of the specifications of the cast iron casting. It is an object of the present invention to provide a cast iron casting, a cast iron casting manufacturing method, and a cast iron casting manufacturing facility that can be applied.
  • the present invention is formed by depressurizing mold sand to form a mold, pouring molten metal into the mold, and the molten metal. comprise the step of temperature of the casting is to reduce the pressure within the mold until the following a 1 transformation point, and characterized.
  • the present invention also provides at least one mold, a frame feed device for moving the mold, a mold, in a cast iron casting production facility for producing cast iron casting by pouring molten metal into a mold formed by depressurizing the mold sand.
  • At least one fixed suction device that depressurizes the inside of the mold when stopped, and at least one movable suction device that moves while depressurizing the inside of the mold instead of the fixed suction device when the mold moves. Note until the casting temperature in the mold after the hot water is below the a 1 transformation point, repeating the stopping and movement by the frame feeder, and wherein.
  • the present invention provides a casting mold making method involving pouring into the mold the molding sand is molding in vacuo, Note casting temperature in the hot water after the mold continues to reduce the pressure in the mold until the following A 1 transformation point It is manufactured by this.
  • Method for producing cast iron of the present invention is to molding and vacuum the mold using a molding sand containing no Nebayuizai, after pouring, to a temperature of the casting to be built into the mold falls below the A 1 transformation point The inside of the mold is continuously decompressed.
  • the present invention oxidizes graphite and free cementite, which have an adverse effect on plating treatment or flaw treatment, by creating a state in which the inside of the mold continues to be depressurized and air continues to flow on the casting surface.
  • the purpose is to create a layer.
  • the target material is cast iron, and no operation that results in a metastable solidification reaction in the Fe—C binary alloy phase diagram, such as forced quenching, is performed. continue to reduce the pressure in the mold until the following a 1 transformation point is the reaction completion temperature.
  • a 2 transformation point is a magnetic transformation point of Fe
  • a 3 transformation point of the crystal structure changes to face-centered cubic lattice from the body-centered cubic lattice, and crystal structure again body-centered cubic lattice of a face-centered cubic lattice the varying a 4 transformation point, each lower temperatures graphite or eutectic or eutectoid reaction of cementite occurs at. For this reason, it is not sufficient to release the reduced pressure state after the inside of the mold is continuously decompressed until the temperature becomes lower than the respective transformation point.
  • a shielding member adhesion process for closely adhering the shielding member to the surface of the original model board is in close contact.
  • a process of forming a shielding member by adsorbing to the mold sand side, a process of forming a half mold having a molding surface by releasing the original model board from the shielding member, and molding in the same manner as the half mold The process of forming a casting cavity by matching with one half mold, the process of pouring molten metal (molten metal) into the casting cavity (pouring process), and then releasing the negative pressure state in the molding frame Mold casting and pouring having a process of taking out the casting
  • V Process vacuum mold formation method
  • a model made of a resin foam is embedded in mold sand that does not contain a binder, and the molded foam is melted while the resin foam is melted in a molded mold by reducing the pressure inside. Also included is the disappearance model casting method.
  • the reduced pressure of the mold is extremely close to atmospheric pressure, the mold sand falls on the casting surface, so that it is impossible to create a state where air always flows on the casting surface.
  • the reduced pressure is made extremely close to vacuum, it is possible to create a state in which air always flows on the casting surface, but the molten metal penetrates into the voids between the mold sand grains and causes a significant insertion defect.
  • the reduced pressure is preferably between ⁇ 10 kPa and ⁇ 70 kPa.
  • the mold sand in the present invention may be any kind such as dredged sand, olivine sand, chromite sand, zircon sand, and ceramic artificial sand.
  • a material having high air permeability when filled as a mold is suitable, and therefore, a material having a small proportion of particles having a diameter of less than 53 ⁇ m in the mold sand is suitable. It is.
  • the ratio of particles having a diameter of less than 53 ⁇ m in the mold sand is excessive, the mold does not have sufficient air permeability, and sufficient air flow does not occur in the vicinity of the casting surface, so that a decarburized layer cannot be formed. Therefore, the ratio of particles having a diameter of less than 53 ⁇ m is desirably 10% or less.
  • the time that the temperature of the casting to be built in the mold required until below the A 1 transformation point differs by the mass and thickness of the product.
  • the temperature of the casting to be incorporated in the mold in the manufacturing facility of cast iron with a fixed suction device and a movable suction device frame number of required to perform until the following A 1 transformation point, in the mold can not directly measure the surface temperature of the casting C, for it takes until the temperature of the casting is less than the a 1 transformation point, it performs casting either or experimentally confirmed by casting simulation on set in advance casting conditions, actually measure the time required until the following a 1 transformation point, it is necessary to know.
  • Drawing 1 is a mimetic diagram showing the composition of the cast iron casting manufacturing equipment concerning a 1st embodiment.
  • the cast iron casting manufacturing facility 1 is a facility that manufactures cast iron castings using the V process, and includes a mold 2 that uses mold sand that does not contain a binder, a mold surface plate 3, a frame feeding device 4, and a fixed suction.
  • a device 5 and a movable suction device 6 are provided.
  • the mold 2 is a mold in which a mold is formed from mold sand in a molding frame.
  • FIG. 1 shows the state of the fixed suction device 5 and the movable suction device 6 immediately before the mold 2 moves.
  • the fixed suction device 5 sucks each mold 2 to decompress the inside of the mold 2, and when the mold 2 moves, the fixed suction device 5 is detached, and instead the movable suction device 6 is attached to the mold 2.
  • the mold 2 is suctioned and the inside of the mold 2 is depressurized.
  • the movable suction device 6 moves following the mold 2, and after the movement is completed, the movable suction device 6 is detached.
  • the fixed suction device 5 comes into close contact with the mold 2 and sucks the mold 2, thereby moving the mold 2 into the mold 2.
  • the pressure is reduced.
  • FIG. 1 it is assumed that the mold 2 moves from the right side to the left side of the drawing, the right end mold 2 is in a state immediately after pouring, and the left end mold 2 has a temperature of a casting incorporated in the mold after pouring. A It is in the state where it was decompressed until it became below 1 transformation point.
  • the frame feeding device 4 is first brought into close contact with the mold surface plate 3 on which both ends of the mold 2 are placed, and the mold surface plate 3 is fixed from both sides. . Further, the mold 2 is kept in a reduced pressure state when the fixed suction device 5 communicating with the pipe 7 is in close contact with a suction source (not shown). Further, the movable suction device 6 communicating with the hose 8 that freely moves to a suction source (not shown) is brought into close contact with the mold 2 to depressurize the mold 2 and at the same time, the fixed suction device 5 is detached.
  • FIG. 2 is a schematic diagram showing a state after the movable suction device 6 has moved following the mold 2 fed by the frame feeding device 4. Since the movable suction device 6 is connected to the frame feeding device 4 by a connection mechanism (not shown), the movable suction device 6 moves following the operation of the frame feeding device 4. Thus, the mold 2 is kept in a reduced pressure state by the movable suction device 6 even during movement.
  • the leftmost mold 2 is transported to a secondary cooling step or a frame opening step, which is the next step, by a transport device not shown.
  • a new non-poured frame is conveyed from the molding step, which is a previous step, to the right end by a conveying device having a suction device (not shown).
  • the fixed suction device 5 is brought into close contact with the mold 2 to depressurize the mold 2 and at the same time, the movable suction device 6 is detached. In this way, the reduced pressure state of the mold 2 is maintained by the fixed suction device 5.
  • FIG. 3 is a schematic diagram showing the state of the fixed suction device 5 and the movable suction device 6 immediately after returning to the original position.
  • the number of the molds 2 placed on the series of mold surface plates 3 closely fixed by the frame feeding device 4 is determined by the cycle time, which is the time required to mold the mold
  • temperature of the casting to be incorporated in the mold is determined by the time until the following a 1 transformation point.
  • the cycle time which is the time required to mold the mold
  • temperature of the casting to be incorporated in the mold is determined by the time until the following a 1 transformation point.
  • the mold 2 placed on a series of mold surface plates 3 tightly fixed by the frame feeding device 4 is cooled while being kept in a reduced pressure state by the fixed suction device 5 and the movable suction device 6.
  • the mold may be moved by the frame feeding device 5 without being sucked.
  • the cast iron casting manufacturing facility 1 includes a mold 2, a mold surface plate 3, a frame feeding device 4, a fixed suction device 5, and a movable suction device 6.
  • FIG. 4 is a schematic cross-sectional view around the mold 2 according to the second embodiment.
  • FIG. 4 includes a mold 2 that uses a molding sand 9 that does not contain a binder, a fixed suction device 5, a temperature sensor 10, and a control device 11, and the temperature sensor 10 is a casting C in the mold 2.
  • the V process mold in a state of being inserted into and contacted with the thickest portion of is shown.
  • the temperature sensor 10 is waiting in advance immediately above the thickest portion of the casting C outside the mold 2.
  • the control device 11 moves the temperature sensor 10. Further, the mold 2 communicates with a suction source (not shown) through a fixed suction device 5 and a pipe 7.
  • the temperature sensor 10 When information indicating that pouring has been completed is input to the control device 11, the temperature sensor 10 is inserted into contact with the thickest portion of the casting C in the mold 2 by an insertion / removal device (not shown). . Thereby, the temperature information of the casting C surface is input to the control device 11.
  • control unit 11 with information from the temperature sensor 10 is the product surface temperature of the casting C senses that it has reached below the A 1 transformation point, the control unit 11 a stationary suction device 5 is detached from the mold 2, a reduced pressure To release. Next, the temperature sensor 10 is removed by an insertion / removal device (not shown).
  • the temperature of the upper surface of the frying is measured with a non-contact thermometer, the temperature information of the upper surface of the frying is monitored by the control device 11, and the temperature of the upper surface of the frying has risen to the molten metal temperature.
  • the temperature sensor 10 may be inserted and contacted when it is determined that the hot water is completed.
  • the cast iron casting manufacturing facility 1 includes a mold 2, a mold surface plate 3, a frame feeding device 4, a fixed suction device 5, and a movable suction device 6.
  • FIG. 5 is a schematic cross-sectional view around the mold 2 according to the third embodiment.
  • FIG. 5 is composed of a mold 2 using a molding sand 9 that does not contain a binder, a temperature sensor 10, a control device 11, a warning light 12, and a two-way valve 13, and the temperature sensor 10 is used as a mold.
  • 2 shows a V process mold in a state where it is inserted into and contacted with the thickest portion of the casting C in 2.
  • FIG. Similar to the second embodiment, the temperature sensor 10 is waiting in advance immediately above the thickest portion of the casting C outside the mold 2.
  • the standby position of the temperature sensor 10 varies depending on the product, the horizontal position and the height from the reference plane of each thickest portion are stored in a storage device (not shown) in advance, and the information is stored in the information. Based on this, the control device 11 moves the temperature sensor 10.
  • the mold 2 is connected to a two-way valve 13 by an easily detachable hose 8, and the two-way valve 13 communicates with a suction source (not shown) via a pipe 7.
  • the control device 11 when information indicating that pouring has been completed is input to the control device 11, temperature detection is performed at the thickest portion of the casting C in the mold by an insertion / removal device (not shown). The container 10 is brought into contact with insertion. Thereby, the temperature information of the casting C surface is input to the control device 11.
  • the controller 11 lights the warning lamp 12.
  • the two-way valve 13 is manually closed, and the hose 8 is removed from the mold 2 to release the reduced pressure state.
  • the temperature sensor 10 is removed by an insertion / removal device (not shown).
  • the means for inputting information that pouring is completed to the control device 11 is not particularly limited as in the second embodiment.
  • a push button that is connected to the control device 11 by the operator after pouring is completed. It is possible to input information that the pouring has been completed by pressing, measure the temperature of the upper surface of the frying with a non-contact thermometer, monitor the temperature information of the upper surface of the frying with the control device 11, and the upper surface of the frying is molten.
  • the temperature sensor 10 may be inserted and contacted by determining that pouring has been completed when the temperature has risen.
  • the molding sand containing no binder is used.
  • a trace amount of binder may be contained in the mold sand.
  • the present invention is a method for producing a cast iron casting in which the surface of the casting is subjected to plating treatment or glazing treatment after casting, in which the molding sand containing no binder is used and the inside of the casting mold is decompressed.
  • the temperature of the casting to be built into the mold continues to reduce the pressure in the mold until the following a 1 transformation point, always casting surface state through which air flows become. Therefore, in the casting in a high temperature state, graphite existing near the surface is quickly oxidized, so that a decarburized layer is formed near the casting surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
PCT/JP2015/083213 2015-07-24 2015-11-26 鋳鉄鋳物、鋳鉄鋳物の製造方法、及び、鋳鉄鋳物製造設備 Ceased WO2017017863A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US15/747,065 US20180369900A1 (en) 2015-07-24 2015-11-26 Cast-iron casting, method for manufacturing cast-iron casting, and equipment for manufacturing cast-iron casting
KR1020187003443A KR20180034470A (ko) 2015-07-24 2015-11-26 주철 주물, 주철 주물의 제조 방법, 및 주철 주물 제조 설비
EP15899695.9A EP3326733B1 (en) 2015-07-24 2015-11-26 Cast-iron casting, method for manufacturing cast-iron casting, and equipment for manufacturing cast-iron casting
JP2017510700A JP6586994B2 (ja) 2015-07-24 2015-11-26 鋳鉄鋳物、鋳鉄鋳物の製造方法、及び、鋳鉄鋳物製造設備
CN201580003017.5A CN106559990B (zh) 2015-07-24 2015-11-26 铸铁铸件、铸铁铸件的制造方法以及铸铁铸件的制造设备
RU2018103953A RU2710612C2 (ru) 2015-07-24 2015-11-26 Чугунная отливка, способ производства чугунной отливки и оборудование для производства чугунной отливки

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-146257 2015-07-24
JP2015146257 2015-07-24

Publications (1)

Publication Number Publication Date
WO2017017863A1 true WO2017017863A1 (ja) 2017-02-02

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PCT/JP2015/083213 Ceased WO2017017863A1 (ja) 2015-07-24 2015-11-26 鋳鉄鋳物、鋳鉄鋳物の製造方法、及び、鋳鉄鋳物製造設備

Country Status (7)

Country Link
US (1) US20180369900A1 (ru)
EP (1) EP3326733B1 (ru)
JP (1) JP6586994B2 (ru)
KR (1) KR20180034470A (ru)
CN (1) CN106559990B (ru)
RU (1) RU2710612C2 (ru)
WO (1) WO2017017863A1 (ru)

Cited By (3)

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CN110842188A (zh) * 2019-11-27 2020-02-28 株洲金特硬质合金有限公司 一种硬质合金刀具制造设备
CN115090835A (zh) * 2022-06-22 2022-09-23 曹涛 一种五金铸件的精密铸造工艺
CN120243859A (zh) * 2025-06-04 2025-07-04 山西隆庆达机械制造股份有限公司 一种铸铁电机壳毛坯离心铸造模具

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CN115502152B (zh) * 2022-09-01 2023-05-30 扬州一川镍业有限公司 一种镍矿铁水浇注成型后处理工艺

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CN106559990A (zh) 2017-04-05
EP3326733A1 (en) 2018-05-30
EP3326733A4 (en) 2019-01-02
RU2018103953A (ru) 2019-08-26
RU2710612C2 (ru) 2019-12-30
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KR20180034470A (ko) 2018-04-04
CN106559990B (zh) 2019-11-05

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