[go: up one dir, main page]

EP3135399B1 - Procédé de fabrication de pièces coulées de précision pour systèmes d'échappement de véhicule - Google Patents

Procédé de fabrication de pièces coulées de précision pour systèmes d'échappement de véhicule Download PDF

Info

Publication number
EP3135399B1
EP3135399B1 EP15195578.8A EP15195578A EP3135399B1 EP 3135399 B1 EP3135399 B1 EP 3135399B1 EP 15195578 A EP15195578 A EP 15195578A EP 3135399 B1 EP3135399 B1 EP 3135399B1
Authority
EP
European Patent Office
Prior art keywords
mold
ceramic balls
ceramic
product
cast
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.)
Not-in-force
Application number
EP15195578.8A
Other languages
German (de)
English (en)
Other versions
EP3135399A1 (fr
Inventor
Jung Suk Lee
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.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
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 Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Publication of EP3135399A1 publication Critical patent/EP3135399A1/fr
Application granted granted Critical
Publication of EP3135399B1 publication Critical patent/EP3135399B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/165—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents in the manufacture of multilayered shell moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • 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
    • 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
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • 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
    • B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum

Definitions

  • the present disclosure relates to a precision casting method, and more particularly to a method of manufacturing precision cast parts for vehicle exhaust systems capable of saving manufacturing costs and reducing manufacturing time while providing excellent heat resistance and precision.
  • parts used in automobile exhaust systems have to endure exhaust gases having a high temperature of 800 to 950°C.
  • drive parts are manufactured using materials containing a large amount of expensive nickel (Ni) having high heat resistance, such as stainless steel, and Inconel alloys, since such parts have a complicated shape.
  • Elements such as aluminum (Al), titanium (Ti), and the like are added to such heat-resistant alloys to enhance high-temperature strength.
  • the added elements such as Al, Ti, and the like are highly reactive with air, it is difficult to control the alloy elements. Therefore, the alloy elements are dissolved in a vacuum state, and subjected to a precision casting process to manufacture the parts.
  • a precision casting process includes fabricating a model having the same shape as a product to be cast using wax or plastics, dipping the model in the slurry to coat a surface of the model several times with slurry, in which a filler is mixed with a binder, together with powdery sand, drying the model, and heating a mold to a temperature of 100 to 200°C to remove the wax and plastics remaining in the mold.
  • Precision casting processes are well-known in the art, in particular JPS 63 112041 A1 , WO9925511 A1 , GB789769 A and JPS 60 27442 A disclose processes wherein different forms of filler materials, such as shot, are used in combination with the mold.
  • the mold thus manufactured is heated to a temperature of 1,000 to 1,200°C to secure fluidity of a molten metal, the molten metal is injected into the mold, and the mold is cooled, and then removed. Then, the molten metal is subjected to subsequent processes to prepare a product.
  • the above-described method has a drawback in that, when the product is prepared by such a method, labor and manufacturing costs may be high since the method includes performing a coating process several times. Additionally, the method has a problem in that the mold may be damaged during pre-heating of the mold or injection of the molten metal when the coating number decreases. A conventional mold capable of easily shaking out casts, and a method of manufacturing the same suffer from an unsolved problem in that labor and manufacturing costs may be high since the method includes performing a coating process several times. Further, the mold may be damaged when the coating number is optionally decreased.
  • KR 1020140087281 A discloses a mold for investment casting and a method for manufacturing the same.
  • the method for manufacturing the mold for investment casting includes a step of manufacturing a product model using wax or plastic; a step of dipping a surface of the product model in slurry containing alumina (Al 2 O 3 ) powders and colloidal silica, coating the surface with alumina powders, and drying the surface; a step of forming a mold for a product by forming and drying a backup layer on the product model coated with the alumina powders with salt dissolving in water or alcohol; and a step of removing the product model from the formed mold for a product.
  • alumina Al 2 O 3
  • JP S63 112041 discloses lost wax casting method.
  • the application discloses a ceramics powder that is subjected to a coating in multiple layer for a wax model and a ceramics mold 2 is formed with its calcination.
  • This ceramics mold 2 is inputted into the pouring box 1 made of an iron, etc., and a steel shot 3 is filled up around the ceramics mold 2.
  • a molten metal 4 is then poured into the mold 2 by gravity method by setting the mold temp. at about 300-700 deg.C.
  • the spheroidal graphite cast iron suitable for the rotor material, etc., of a rotary engine can be subjected to a lost wax casting.
  • WO99/25511 A1 discloses investment casting patent application where metal articles are cast in a mould containing compacted sand and a cold thin ceramic shell which has been produced by wax pattern.
  • GB 789 769 A discloses improvements in making casting molds.
  • an expendable-pattern is coated with a liquid-suspension of a finegrained refractory which is caused to set hard, and the coated pattern is supported in a flask and surrounded with dry unbonded granular refractory material which is packed to substantially its practical maximum-bulk-density, as by shaking, vibrating, tamping, &c.
  • the flask may be closed at each end by a refractory cement-layer.
  • one end-closure may be in the form of a perforated metal plate pressed against the back-up refractory by a threaded retainer-ring, clamps, &c.
  • a perforated metal plate pressed against the back-up refractory by a threaded retainer-ring, clamps, &c.
  • Such a plate may also be used to hold a coarse-grained refractory back-up in position and under pressure, while a finer-grained refractory is percolated through the holes of the plate and into the interstices between the coarserparticles.
  • the flask is enclosed in a layer of heat-insulating material, such as asbestos-paper, high-temperature ceramic paint or cement, or a highly-reflective layer of bright metal.
  • JP S60 27442 A discloses casting mold.
  • a wax mold 1 having approximately the same shape as the shape of a casting with, for example, a lost wax method is dipped in a silica slurry 2 prepd. by kneading pulverous powder of potassium silicate salt as the eutectic compsn. silicate of an alkali metal and a concd. aq. soln. of sodium silicate.
  • the mold 1 is pulled from the slurry to form a silicate layer 3 consisting of the slurry 2 on the surface thereof after prescribed time and is rested for required time in flowing air to dry naturally.
  • the dried mold 1 is dipped in a slurry 4 consisting of molten silica and collidal silica to be used in the molding stage of the lost wax method and immediately thereafter the surface of the slurry 4 is coated with Zr sand 5 and is dried naturally. The above-mentioned operation is then repeated until the required strength is obtd. to form a coating layer 6 and in succession the mold is subjected to dewaxing calcination preheating until a casting mold 7 is obtd.
  • the present disclosure has been made in view of the above problems, and it is an object of the present disclosure to provide a method of manufacturing precision cast parts for vehicle exhaust systems capable of manufacturing precision cast parts for vehicle exhaust systems having excellent precision while decreasing the coating number during manufacture of a mold.
  • the above and other objects can be accomplished by the provision of a method of manufacturing precision cast parts for vehicle exhaust systems according to claim 1.
  • the method of manufacturing precision cast parts for vehicle exhaust systems may further include the heating of the ceramic balls to a temperature of 500 to 700°C.
  • the cast preparation may include pre-heating the mold to a temperature of 500 to 1,200°C.
  • the product production may include casting the product in a vacuum state to prevent oxidation of the molten metal.
  • the ceramic ball may be formed of alumina (Al 2 O 3 ), and may include first and second ceramic balls having different diameters.
  • the first ceramic balls may have a higher diameter than the second ceramic balls.
  • the ceramic box may be formed of Inconel materials.
  • the first slurry may be formed by mixing zircon powder and colloidal silica
  • the second slurry may be formed by mixing aluminosilicate, colloidal silica, and sand.
  • the present disclosure is characterized in that, when precision cast parts for vehicle exhaust systems having excellent heat resistance and a complicated shape are manufactured using a precision casting technique, parts having excellent precision, by reinforcing a strength of a mold using ceramic balls while simplifying processes due to a decrease in coating number, may be produced.
  • FIG. 1 is a flowchart showing a method of manufacturing precision cast parts for vehicle exhaust systems according to one preferred embodiment of the present disclosure
  • FIG. 2 is a schematic diagram for explaining preparation of a cast according to one preferred embodiment of the present disclosure.
  • the method of manufacturing precision cast parts for vehicle exhaust systems includes model fabrication, first and second coatings, mold preparation, cast preparation, and product production.
  • the model fabrication may include fabricating a model of a product to be manufactured using wax or plastics, such as precision cast parts for vehicle exhaust systems, etc.
  • a surface of the model is coated with a first slurry including colloidal silica and zircon powder by dipping the model in such a dipping solution.
  • the first coating is repeatedly performed once or twice to form a first coating layer.
  • powdery sand is mixed with backup slurry including colloidal silica and aluminosilicate to prepare second slurry, and a second coating layer is formed on a surface of the model coated with the first coating layer using the second slurry.
  • the second coating layer may be formed by performing a precision casting process 3 to 5 times, a coating number of which is 1 to 5 times lower than a conventional precision casting process which has been performed 6 to 8 times to form a conventional backup coating layer.
  • the coating number when the coating number is less than 3 times, a mold 100 may be damaged during subsequent pre-heating and casting of the mold 100, resulting in poor casting.
  • productivity when the coating number is greater than 5 times, productivity may not be improved and manufacturing costs may not be saved due to increases in labor and time for the manufacturing. As a result, the coating may be performed 3 to 5 times.
  • the first and second coating layers are dried and heated to remove the model formed of the wax or plastics.
  • removal of the model may include heating the mold 100 to a temperature of 100 to 200°C to remove the model.
  • the heating temperature is less than 100°C, a long period of time may be required to remove the model, resulting in lowered productivity.
  • the heating temperature is greater than 200°C, foreign substances may be formed inside the mold 100 as the wax or plastics combust.
  • the wax or plastics thus removed may be recycled during subsequent fabrication of the model.
  • the mold 100 is prepared, in the cast preparation, the mold 100 is pre-heated, and then placed in a ceramic box 200 with a top portion open and an inner part filled with ceramic balls 300.
  • the mold 100 may be pre-heated to a temperature of 500 to 1,200°C, depending on types of materials of the molten metal. Therefore, precision of a product may be improved to secure fluidity of the molten metal during casting.
  • the ceramic box 200 may be formed of Inconel.
  • the mold 100 when the mold 100 is manufactured using stainless steel, etc., the mold 100 may be damaged, for example, deformed due to insufficient heat resistance as the mold 100 may be heated to 1,200°C.
  • the ceramic balls 300 filled in the ceramic box 200 may be formed of alumina (Al 2 O 3 ), and may include first and second ceramic balls 310 and 320 having different diameters.
  • the first ceramic balls 310 are preferably formed so that the first ceramic balls 310 have a greater diameter than the second ceramic balls 320. More preferably, the first ceramic balls 310 may be formed so that the diameter of the first ceramic balls 310 is twice as great as that of the second ceramic balls 320.
  • the ceramic balls 300 may be filled in the ceramic box 200 to reinforce the mold 100 manufactured according to one preferred embodiment of the present disclosure by lowering the coating number.
  • the mold 100 may endure a load applied against a pressure of the molten metal, compared to when ceramic balls having a single size are used when pores of the first ceramic balls 310 are filled with the second ceramic balls 320 having a relatively low diameter.
  • the first ceramic balls 310 may be formed so that the diameter of the first ceramic balls 310 is twice that of the second ceramic balls 320.
  • the method of manufacturing precision cast parts for vehicle exhaust systems may further include heating the ceramic balls 300 to remove foreign substances from surfaces of the ceramic balls 300 prior to cast preparation.
  • the ceramic balls 300 may be heated to a temperature of 500 to 700°C to remove foreign substances remaining on the surfaces of the ceramic balls 300.
  • a temperature of less than 500°C a long period of time may be required to remove the foreign substances or the foreign substances may not be completely burn.
  • the ceramic balls 300 are heated to a temperature of greater than 700°C, an increase in expense required to remove the foreign substance may be encountered. As a result, the ceramic balls 300 may be heated to a temperature of 500 to 700°C.
  • product production may include casting the product in a vacuum state.
  • parts used in a vehicle exhaust system are generally manufactured using materials having excellent heat resistance, such as Inconel.
  • Inconel has a problem in that the molten metal may be excessively oxidized at high temperature, which leads to a degradation of product quality.
  • Table 1 Items Produc t materi al Casting atmosph ere 2 nd coatin g No. Mold preheat ing temp.
  • Example 1 SCH22 Air Twice 650°C SUS 304 Diameters of 1/2 mm mixed ⁇ Waste gate valve Mold damaged Comp.
  • Example 2 SCH22 Air 4 times 450°C SUS 304 Diameters of 1/2 mm mixed ⁇ Waste gate valve Insufficiently filled Comp.
  • Example 3 SCH22 Air 4 times 650°C SUS 304 Diameter of 1 mm only ⁇ Waste gate valve Mold damaged Comp.
  • Example 4 SCH22 Air 4 times 650°C SUS 304 Diameter of 2 mm only ⁇ Waste gate valve Mold damaged Comp.
  • Example 5 SCH22 Air 4 times 650°C SUS 304 Diameters of 1/2 mm mixed ⁇ Waste gate valve Defects in systemic structure Comp .
  • Example 6 SCH22 Air 4 times 650°C SUS 304 Not used ⁇ Waste gate valve Mold damaged Comp.
  • Example 7 Incone 1 718C Air 4 times 1,100°C Incone 1 718C Diameters of 1/2 mm mixed ⁇ Turbine wheel Molten metal oxidated Comp.
  • Example 8 Incone 1 718C Vacuum Twice 1,100°C Incone 1 718C Diameters of 1/2 mm mixed ⁇ Turbine wheel Mold damaged Comp.
  • Example 9 Incone 1 718C Vacuum 4 times 650°C Incone 1 718C Diameters of 1/2 mm mixed ⁇ Turbine wheel Insufficiently filled Comp.
  • Example 10 Incone 1 718C Vacuum 4 times 1,100°C SUS 304 Diameters of 1/2 mm mixed ⁇ Turbine wheel Cased damaged Comp.
  • Example 11 Incone 1 718C Vacuum 4 times 1,100°C Incone 1 718C Diameter of 1 mm only ⁇ Turbine wheel Mold damaged Comp.
  • Example 12 Incone 1 718C Vacuum 4 times 1,100°C Incone 1 718C Diameter of 2 mm only ⁇ Turbine wheel Mold damaged Comp.
  • Example 13 Incone 1 718C Vacuum 4 times 1,100°C Incone 1 718C Diameters of 1/2 mm mixed ⁇ Turbine wheel Defects in systemic structure Comp.
  • Example 14 Incone 1 718C Vacuum 4 times 1,100°C Incone 1 718C Not used ⁇ Turbine wheel Mold damaged
  • Table 1 lists results obtained by comparing the precision cast parts for vehicle exhaust systems prepared in Examples according to one preferred embodiment of the present disclosure and Comparative Examples.
  • the waste gate valves each of which includes a minimum thickness portion having a thickness of approximately 2 to 5 mm, are formed of a stainless steel material as shown in Examples 1 to 5, the waste gate valves have high oxidation resistance to the molten metal at a high temperature, and thus may also be prepared by air casting.
  • the second coating number when the second coating number is reduced to less than 3 times, the mold 100 is damaged as described in Comparative Example 1, which makes it impossible to cast a product.
  • productivity when the second coating number is increased to at least 6 times, productivity may be degraded due to an increase in manufacturing costs and time required for the second coating. As a result, the second coating number may be limited to 3 to 5 times.
  • the mold 100 when the mold 100 is pre-heated at a temperature of less than 500°C as described in Comparative Example 2, the mold 100 is not sufficiently heated, and thus the molten metal may be solidified before the mold 100 is filled with the molten metal, resulting in an insufficient filling of the molten metal.
  • the mold 100 may be heated to a temperature of 700°C or higher, but an increase in manufacturing costs may be encountered due to an increase in temperature. As a result, the heating temperature is limited to a range of 500 to 700°C.
  • the material of the ceramic box 200 may be used as long as it is SUS 300-series stainless steel capable of enduring a temperature of 500 to 700°C when the mold 100 is heated to that temperature.
  • the ceramic balls 300 serve to reinforce the mold 100 when the mold 100 is heated to a high temperature.
  • first ceramic balls 310 having a diameter of 2 mm, and second ceramic balls 320 having a diameter of 1 mm were used together.
  • Such ceramic balls 300 endure a load applied against a pressure of the molten metal in a state in which the mold 100 is heated to a high temperature.
  • the mold 100 may be damaged when the ceramic balls 300 having a single diameter are used as described in Comparative Examples 3 and 4, whereas the mold 100 may also be damaged even when the ceramic balls 300 are not used as described in Comparative Example 6, unlike when ceramic balls 300 having a single diameter are used.
  • SUS 300-series stainless steel parts having a thickness of 2 to 5 mm are prepared under the optimum conditions such as a casting atmosphere of air, a second coating number of 3 to 5 times, a temperature of 500 to 700°C used to heat the mold 100, use of SUS 300-series stainless steel as a material of the ceramic box 200, mixed use of ceramic balls 300 having different thicknesses of 1 mm and 2 mm, and removal of foreign substances on the ceramic balls 300, as described in Examples 1 to 5.
  • turbocharger turbine wheels including a minimum thickness portion having a thickness of 2 mm or less are the optimum conditions.
  • the turbine wheels since the turbine wheels have parts directly exposed to exhaust gases having a high temperature of 800 to 950°C, Inconel-series materials having good heat resistance may be used.
  • Inconel-series materials have good heat resistance when the Inconel-series materials are prepared into parts, but are very sensitive to oxidation when the Inconel-series materials are in a molten metal state. Therefore, the Inconel-series materials should be necessarily cast in a vacuum atmosphere. Accordingly, it could be seen that the molten metal is easily oxidized when the Inconel-series materials are melted and cast in the air, which makes it impossible to cast the Inconel-series materials, as described in Comparative Example 7.
  • the second coating number when the second coating number is less than 3 times (Comparative Example 8), casting is impossible due to damage of the mold 100.
  • the second coating number when the second coating number is greater than or equal to 6 times, it may cause an increase in manufacturing costs. As a result, the second coating number may be limited to 3 to 5 times.
  • the temperature used to heat the mold 100 should be 1,000°C or higher since the minimum thickness portion is very thin.
  • the heating temperature is less than 1,000°C, the mold 100 is not sufficiently heated, and thus the molten metal may be solidified before the mold 100 is filled with the molten metal, resulting in insufficient filling of the molten metal (Comparative Example 9).
  • the mold 100 may be heated to 1,200°C or higher, an increase in manufacturing costs may be encountered accordingly. As a result, the heating temperature may be limited to a range of 1,000 to 1,200°C.
  • the material of the ceramic box 200 may not be used as an SUS 300-series stainless steel material such as a waste gate valve since the material of the ceramic box 200 does not endure a temperature of 1,000 to 1,200°C used to heat the mold 100 (Comparative Example 9). High-heat-resistance materials of Inconel series should be used as the material of the ceramic box 200.
  • the mold 100 may be damaged when the ceramic balls 300 having a single size are used (Comparative Examples 11 and 12) or the ceramic balls 300 are not used (Comparative Example 14), and that casting defects in products occur when foreign substances are not removed from the surfaces of the ceramic balls 300 (Comparative Example 13).
  • Inconel-based parts having a thickness of 2 mm or less are prepared under the optimum conditions such as a casting atmosphere of a vacuum, a second coating number of 3 to 5 times, a temperature of 1,000 to 1,200°C used to heat the mold 100, use of an Inconel-based material as a material of the ceramic box 200, mixed use of ceramic balls 300 having different thicknesses of 1 mm and 2 mm, and previous removal of foreign substances on the ceramic balls 300, as described in Examples 6 to 10.
  • an effect of reducing the manufacturing costs by approximately 30% may be achieved upon manufacture of the precision cast parts for vehicle exhaust systems since the coating cost may be curtailed and a cycle time may be reduced due to a decrease in a second coating number, compared to the conventional precision casting process.
  • the method of manufacturing precision cast parts for vehicle exhaust systems can be useful in manufacturing the precision cast parts for vehicle exhaust systems having excellent precision with a decrease in a coating number, the method has effects of reducing labor and manufacturing time to improve productivity and save manufacturing costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Exhaust Silencers (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (6)

  1. Procédé de fabrication de pièces coulées de précision pour systèmes d'échappement de véhicule, comprenant :
    la fabrication d'un modèle d'un produit à fabriquer à l'aide d'une substance sélectionnée à partir du groupe constitué par une cire et un plastique ;
    la formation d'une première couche de revêtement sur une surface du modèle à l'aide d'une première pâte ;
    la formation d'une seconde couche de revêtement sur la surface du modèle revêtue de la première couche de revêtement à l'aide d'une seconde pâte ;
    le séchage des première et seconde couches de revêtement pour former un moule (100) et le chauffage du moule pour retirer le modèle ;
    le préchauffage du moule, la mise en place du moule dans une boîte en céramique (200) avec une portion supérieure ouverte, et le remplissage d'une partie intérieure de la boîte en céramique avec des billes de céramique (300) ; et
    la production d'un produit en injectant un métal fondu dans le moule afin de couler le produit, caractérisé en ce que le procédé comprend en outre le chauffage des billes de céramique pour retirer des substances étrangères de surfaces des billes de céramiques (300) avant la préparation de coulée.
  2. Procédé selon la revendication 1, dans lequel la préparation de coulée comprend le préchauffage du moule entre 500 et 1200 °C.
  3. Procédé selon la revendication 1, dans lequel l'étape de production d'un produit comprend le coulage du produit dans un état de vide pour empêcher une oxydation du métal fondu.
  4. Procédé selon la revendication 1, dans lequel les billes de céramique (300) sont formées d'alumine (Al2O3) et comprennent des premières et secondes billes de céramiques (310, 320) ayant différents diamètres, dans lequel les premières billes de céramique (310) ont un diamètre plus grand que celui des secondes billes de céramique (320).
  5. Procédé selon la revendication 1, dans lequel la première pâte est formée en mélangeant de la poudre de zircon et de la silice colloïdale.
  6. Procédé selon la revendication 1, dans lequel la seconde pâte est formée en mélangeant de l'aluminosilicate, de la silice colloïdale et du sable.
EP15195578.8A 2015-08-31 2015-11-20 Procédé de fabrication de pièces coulées de précision pour systèmes d'échappement de véhicule Not-in-force EP3135399B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150122677A KR101755832B1 (ko) 2015-08-31 2015-08-31 자동차 배기계용 정밀주조부품 제조방법

Publications (2)

Publication Number Publication Date
EP3135399A1 EP3135399A1 (fr) 2017-03-01
EP3135399B1 true EP3135399B1 (fr) 2019-05-22

Family

ID=54608440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15195578.8A Not-in-force EP3135399B1 (fr) 2015-08-31 2015-11-20 Procédé de fabrication de pièces coulées de précision pour systèmes d'échappement de véhicule

Country Status (4)

Country Link
US (1) US20170056969A1 (fr)
EP (1) EP3135399B1 (fr)
KR (1) KR101755832B1 (fr)
CN (1) CN106475520B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111545708A (zh) * 2020-05-12 2020-08-18 唐山昊中科技有限公司 一种覆膜砂壳型铁砂负压铸造工艺

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE544166A (fr) * 1955-01-05
US3204303A (en) * 1963-06-20 1965-09-07 Thompson Ramo Wooldridge Inc Precision investment casting
US3861449A (en) * 1969-05-05 1975-01-21 Howmet Corp Method of casting metallic objects
JPS6027442A (ja) * 1983-07-22 1985-02-12 Toshiba Corp 鋳型
JPS63112041A (ja) * 1986-10-30 1988-05-17 Mazda Motor Corp ロストワツクス鋳造方法
GB9724568D0 (en) * 1997-11-19 1998-01-21 Castings Dev Centre The Investment casting
AU2027000A (en) * 1998-11-20 2000-09-21 Allison Engine Company, Inc. Method and apparatus for production of a cast component
US7418993B2 (en) * 1998-11-20 2008-09-02 Rolls-Royce Corporation Method and apparatus for production of a cast component
KR20140087281A (ko) 2012-12-28 2014-07-09 재단법인 포항산업과학연구원 정밀주조용 주형 및 그 제조 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111545708A (zh) * 2020-05-12 2020-08-18 唐山昊中科技有限公司 一种覆膜砂壳型铁砂负压铸造工艺

Also Published As

Publication number Publication date
US20170056969A1 (en) 2017-03-02
KR101755832B1 (ko) 2017-07-10
CN106475520A (zh) 2017-03-08
CN106475520B (zh) 2021-02-09
KR20170026890A (ko) 2017-03-09
EP3135399A1 (fr) 2017-03-01

Similar Documents

Publication Publication Date Title
EP1244524B1 (fr) Ame en ceramique et procede de fabrication correspondant
EP3030367B1 (fr) Procede de fabrication d'une coque de coulée imprimée 3d
CA2492579C (fr) Procede de chauffage d'un moule
CA1266159A (fr) Article faconne composite durable et permeable
CN106735186A (zh) 一种3d打印‑冷等静压制备钛合金多级齿轮的方法
CN1684786A (zh) 铸造方法以及用于进行该方法的制品
CN104399891A (zh) 一种熔模精密制壳工艺与负压造型技术相结合的铸造方法
JP2003507192A (ja) 金属の格子状網状化構造体を製造する方法および装置
CN114346166B (zh) 一种3d打印砂模精铸型壳制备方法
CN111604470A (zh) 一种超薄壁铸件的制备方法
CN107214299A (zh) 一种熔模铸造型壳的脱蜡方法
US3441078A (en) Method and apparatus for improving grain structures and soundness of castings
CN101429045B (zh) 醋酸锆粘结氧化钇模壳及其制备方法
EP3135399B1 (fr) Procédé de fabrication de pièces coulées de précision pour systèmes d'échappement de véhicule
EP0502580A1 (fr) Moule de coulée
CN114273638A (zh) 一种镁合金薄壁壳体件的低压精密铸造方法
CN115740371A (zh) 一种薄壁铝合金铸件的铸造工艺
CN116099985A (zh) 一种钛系高熵合金铸件的成型方法
EP1027180B1 (fr) Moulage de precision
JPS63140740A (ja) 高融点活性金属鋳造用鋳型
JPS6167540A (ja) 鋳型
CN118720161A (zh) 金属粉末粘接3d打印结合精密铸造的混合3d打印工艺
CN120205754A (zh) 一种大功率燃气轮机动叶片先进凝固成型方法
CN118180328A (zh) 一种制造高退让性高温合金熔模的模壳及模壳的制造方法
CN109277554A (zh) 一种大型薄壁陶瓷与合金复合体构件的铸造成形方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170817

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

RIC1 Information provided on ipc code assigned before grant

Ipc: B22C 9/04 20060101AFI20181207BHEP

Ipc: B22D 27/15 20060101ALI20181207BHEP

Ipc: B22D 17/02 20060101ALI20181207BHEP

Ipc: B22C 1/16 20060101ALI20181207BHEP

Ipc: B22C 9/22 20060101ALI20181207BHEP

Ipc: B22C 3/00 20060101ALI20181207BHEP

Ipc: B22C 7/02 20060101ALI20181207BHEP

Ipc: B22D 25/02 20060101ALI20181207BHEP

Ipc: B22C 9/12 20060101ALI20181207BHEP

Ipc: B22C 9/02 20060101ALI20181207BHEP

INTG Intention to grant announced

Effective date: 20190103

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602015030675

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1135488

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190615

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20190522

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190922

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190822

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190822

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190823

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1135488

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602015030675

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

26N No opposition filed

Effective date: 20200225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191130

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191130

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191120

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20191130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190922

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20151120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190522

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230428

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231023

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20231024

Year of fee payment: 9

Ref country code: DE

Payment date: 20231023

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602015030675

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20241120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20250603

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20241120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20241130