WO2023167342A1 - 高圧鋳造用可溶性中子及びその製造方法 - Google Patents

高圧鋳造用可溶性中子及びその製造方法 Download PDF

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Publication number
WO2023167342A1
WO2023167342A1 PCT/JP2023/010489 JP2023010489W WO2023167342A1 WO 2023167342 A1 WO2023167342 A1 WO 2023167342A1 JP 2023010489 W JP2023010489 W JP 2023010489W WO 2023167342 A1 WO2023167342 A1 WO 2023167342A1
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WIPO (PCT)
Prior art keywords
core
pressure casting
soluble
chemical salt
casting
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Ceased
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PCT/JP2023/010489
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English (en)
French (fr)
Japanese (ja)
Inventor
恭子 廣川
俊 洙 金
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Individual
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Priority to JP2024504459A priority Critical patent/JPWO2023167342A1/ja
Priority to CN202380025187.8A priority patent/CN118891116A/zh
Priority to US18/842,701 priority patent/US20250170637A1/en
Priority to EP23763599.0A priority patent/EP4487978A4/en
Publication of WO2023167342A1 publication Critical patent/WO2023167342A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/003—Removing cores using heat

Definitions

  • 10-2002-0009334 discloses a core technology for high-pressure casting using a chemical salt having a melting point lower than that of a casting alloy. It can be usefully applied to the production of die-cast products with relatively low heat capacity of cast alloys such as aluminum and magnesium alloys with a thickness of about 25 mm, thick products with a product thickness of 25 mm or more with a high heat capacity, or products with a drastic change in product thickness.
  • cast alloys such as aluminum and magnesium alloys with a thickness of about 25 mm, thick products with a product thickness of 25 mm or more with a high heat capacity, or products with a drastic change in product thickness.
  • high-pressure casting products such as molten metal forging and die casting. Therefore, it is useful for the production of die-cast products with a high heat capacity of the casting alloy, and it is possible to form a thick-walled product. is a necessary fact.
  • Patent Document 0001 Korean Patent Publication No. 10-2002-0009334 (2002.02.01)
  • the present invention was devised to solve the problems of the prior art as described above. Disclosed is a method for manufacturing a soluble core for high-pressure casting, capable of high-pressure casting a thick-walled product having a complicated shape inside using a casting core. Another object of the present invention is to melt heat-resistant hard powder uniformly dispersed and blended so that it has a melting point 140 to 260° C. lower than the melting point of the cast metal and a heat capacity of 90 J/(mo ⁇ K) or more.
  • a method for producing a core for high-pressure casting in which a chemical salt is injected and solidified into a core mold to produce a core, and a cast product using the soluble core for high-pressure casting produced by the above-mentioned production method is thermally deformed.
  • one aspect of the present invention is to produce a water-soluble chemical salt mixture having a melting temperature of 390 to 520° C. in a method for producing a soluble core for high pressure casting. and a step of uniformly dispersing and blending a heat-resistant hard powder into the water-soluble chemical salt mixture to produce a molten chemical salt having a heat capacity of 90 J/(mo ⁇ K) or more.
  • the present invention also relates to a method for producing a soluble core for high-pressure casting, which comprises pouring and solidifying the produced molten chemical salt into a core mold to produce a core.
  • the water-soluble chemical salt mixture in the present invention can contain any one or more selected from the group consisting of chloride-based chemical salts, carbide-based chemical salts and sulfide-based chemical salts.
  • Chloride-based chemical salts may include, but are not limited to, any one or more selected from the group consisting of NaCl, KCl, MnCl2 , CaCl, MgCl2 and LiCl.
  • Carbide-based chemical salts may include, but are not limited to, one or more selected from the group consisting of K 2 CO 3 , Li 2 CO 3 and Na 2 CO 3 .
  • the sulfide-based chemical salt may include, but is not limited to, any one or more selected from the group consisting of K 2 SO 4 , Na 2 SO 4 and Li 2 SO 4 .
  • the heat-resistant hard powder in the present invention may contain any one or more selected from the group consisting of TiO2 , Al2O3 and ZrSiO4 .
  • the water-soluble chemical salt mixture in the present invention may have a melting point 140 to 260° C. lower than the melting point of the casting metal.
  • the water-soluble chemical salt mixture comprises any one or more selected from the group consisting of chloride-based chemical salts, carbide-based chemical salts and sulfide-based chemical salts.
  • the melting temperature can be adjusted to 390 to 520°C.
  • the casting metal in the present invention may be aluminum alloy or magnesium alloy, but is not limited thereto.
  • the melting point of the core is about 390 to 520 ° C., which is lower than the temperature of the molten metal to be cast (670 to 720 ° C.), but the heat capacity of the core is 90 J / (mo K) or more.
  • the core manufactured as described above is placed in a mold for high pressure casting, the molten metal is high pressure cast, and then heated to a temperature below the melting point of the casting alloy. It can further include a step of extracting the molten core.
  • Another aspect of the present invention relates to a fusible core for high-pressure casting manufactured by the manufacturing method described above.
  • Still another aspect of the present invention is a melting point 140 to 260°C lower than the melting point of the casting metal containing at least one selected from the group consisting of chloride-based chemical salts, carbide-based chemical salts and sulfide-based chemical salts.
  • the present invention relates to a soluble core for high-pressure casting, characterized by being formed of a molten chemical salt having a heat capacity of 90 J/(mo ⁇ K) or more by uniformly dispersing heat-resistant hard powder. Still another aspect of the present invention is a method for extracting a soluble core for high-pressure casting, characterized in that the soluble core for high-pressure casting is heated to a temperature below the melting point of the product after high-pressure casting, melt-extracted, and then washed with water. Regarding. A method for manufacturing a soluble core for high-pressure casting according to an embodiment of the present invention is described in more detail below.
  • the soluble core for high-pressure casting in the present invention contains any one selected from the group consisting of chloride-based chemical salts, carbide-based chemical salts and sulfide-based chemical salts. It can be manufactured so that the melting temperature of the mixture is 390 to 520°C.
  • the heat-resistant hard powder is uniformly dispersed in the water-soluble chemical salt mixture, and the heat capacity of the molten chemical salt is 90 J/(mo ⁇ K) or more.
  • the mixing ratio for producing the water-soluble chemical salt mixture can be changed in various ways, and various examples can be obtained. It is possible when the heat capacity of the molten chemical salt is 90 J/(mo ⁇ K) or more, so there is no limitation to specific components and compounding ratios.
  • examples of compounding ratio, melting temperature and heat capacity using double partial chloride chemical salt, carbide chemical salt and sulfide chemical salt are shown in the table. to explain.
  • a chloride-based chemical salt, a carbide-based chemical salt, a sulfide-based chemical salt, LiCl, Li 2 CO 3 , and Li 2 SO 4 are 52.9: 19.8: 27.2 ( mol %), the melting point becomes about 445° C., and a core raw material for high-pressure casting with a heat capacity of about 98 J/(mo ⁇ K) can be produced.
  • Heat-resistant hard ceramic particles such as TiO 2 , Al 2 O 3 , ZrSiO 4 are uniformly dispersed and blended therein, and a molten chemical salt mixed solution produced so that the heat capacity is 90 J/(mo ⁇ K) or more is placed in the medium.
  • a core is produced by pouring and solidifying in a child mold.
  • heat-resistant hard ceramic particles such as TiO 2 , Al 2 O 3 , and ZrSiO 4 can be dispersed more uniformly.
  • the heat capacity of the element can be further increased, and the mechanical strength can be increased and improved.
  • a soluble core for high-pressure casting can be manufactured by pouring the solution in which the hard ceramic powder is dispersed and mixed into a core mold and solidifying it.
  • a water-soluble chemical salt having a melting point lower than the melting point of the casting metal by 140 to 260° C. and a heat capacity of 90 J/(mo ⁇ K) or more is used.
  • the method of manufacturing cores in which heat-resistant hard ceramic powder is dispersed is a very useful technology that can easily manufacture cores for high-pressure casting of metals such as aluminum and magnesium. It can be easily heated and extracted at a temperature below the melting point of , and the core material can be recycled.
  • a thick-walled product having a complicated shape inside is subjected to high-pressure casting using a high-pressure casting core made of a water-soluble chemical salt having a lower melting point and a higher heat capacity than the casting alloy of the present invention.
  • FIG. 1 shows the shape of a core for high-pressure casting (symbol CL-460) according to an embodiment of the present invention.
  • FIG. 2 shows a front view and a side view of a sample used in an example of the present invention, with a high-pressure casting mold and a core mounted thereon.
  • FIG. 3 shows a thermal analysis graph of a fusible core (symbol CL-460) according to an embodiment of the present invention.
  • FIG. 4 is a photograph of a high-pressure casting product to which a soluble core (designation CL-460) is applied according to an embodiment of the present invention.
  • FIG. 5 is a photograph of a fusible core (designated CL-460) according to an embodiment of the present invention after high-pressure casting and heat extraction of the core.
  • FIG. 6 shows a photograph of the boundary surface after hot extraction of the core of the high-pressure casting product to which the fusible core (symbol CL-460) is applied according to the embodiment of the present invention.
  • FIG. 7 shows a thermal analysis graph of a fusible core (symbol SL-512) according to an example of the present invention.
  • the thermal analysis method used here measures the difference in energy input to a sample and reference material as a function of temperature while varying the temperature of the sample and reference material in Differential Scanning Calorimetry (DSC). It is a method of measuring as FIG.
  • DSC Differential Scanning Calorimetry
  • Thermal analysis results of the soluble core for high-pressure casting produced in this manner show that melting begins at 460°C (melting point: 456°C) as shown in FIG.
  • the performance of the core was evaluated by a high-pressure die casting method using an AC4C aluminum alloy.
  • High-pressure casting used AC4C aluminum alloy heated to 700° C., gate injection speed of molten metal was 55 m/sec, and final pressure was 980 kg/cm 2 .
  • the core was extracted by heating the casting at a temperature of 500° C. for about 5 minutes to dissolve and extract the core, followed by washing with water.
  • FIG. 5 shows the shape of a cast product obtained by heating and extracting the core after high-pressure casting by the above manufacturing method. It can be seen that it is transcribed as it is. Similar to FIG. 6, it can be seen that the casting surface is clean.
  • cores having a core melting temperature of 390° C. or less form a reaction layer on the boundary surface of the cast product, and are not suitable for use as cores for high-pressure casting of thick-walled products of about 40 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
PCT/JP2023/010489 2022-03-03 2023-02-28 高圧鋳造用可溶性中子及びその製造方法 Ceased WO2023167342A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2024504459A JPWO2023167342A1 (https=) 2022-03-03 2023-02-28
CN202380025187.8A CN118891116A (zh) 2022-03-03 2023-02-28 高压铸造用可熔性型芯及其制造方法
US18/842,701 US20250170637A1 (en) 2022-03-03 2023-02-28 Soluble core for high-pressure casting and manufacturing method thereof
EP23763599.0A EP4487978A4 (en) 2022-03-03 2023-02-28 SOLUBLE CORE FOR HIGH-PRESSURE CASTING AND ITS MANUFACTURING PROCESS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020220027303A KR102576599B1 (ko) 2022-03-03 2022-03-03 고압주조용 가용성 중자 제조 및 이를 이용한 주조방법
KR10-2022-0027303 2022-03-03

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WO2023167342A1 true WO2023167342A1 (ja) 2023-09-07

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PCT/JP2023/010489 Ceased WO2023167342A1 (ja) 2022-03-03 2023-02-28 高圧鋳造用可溶性中子及びその製造方法

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US (1) US20250170637A1 (https=)
EP (1) EP4487978A4 (https=)
JP (1) JPWO2023167342A1 (https=)
KR (1) KR102576599B1 (https=)
CN (1) CN118891116A (https=)
WO (1) WO2023167342A1 (https=)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407864A (en) 1965-06-12 1968-10-29 Schmidt Gmbh Karl Forming hollow cast articles
US3459253A (en) 1964-03-25 1969-08-05 Wellworthy Ltd Method of casting pistons
US3963818A (en) 1971-10-29 1976-06-15 Toyo Kogyo Co., Ltd. Water soluble core for pressure die casting and process for making the same
US4629708A (en) 1983-05-20 1986-12-16 Doulton Industrial Products Limited Moulding
KR20020009334A (ko) 2000-07-26 2002-02-01 김준수 주조용 용해성 코어의 제조방법과 코어 및 그 코어의추출방법
JP2003503210A (ja) * 1999-07-06 2003-01-28 テクノロジー、ユニオン、カンパニー、リミテッド 高圧鋳造用分解性コア、その製造方法、およびその抽出方法
JP2011031276A (ja) * 2009-08-01 2011-02-17 Toyama Prefecture 鋳造用コア
JP2016064436A (ja) * 2014-09-25 2016-04-28 スズキ株式会社 鋳造用塩中子の製造方法および鋳造用塩中子

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840219A (en) * 1988-03-28 1989-06-20 Foreman Robert W Mixture and method for preparing casting cores and cores prepared thereby

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459253A (en) 1964-03-25 1969-08-05 Wellworthy Ltd Method of casting pistons
US3407864A (en) 1965-06-12 1968-10-29 Schmidt Gmbh Karl Forming hollow cast articles
US3963818A (en) 1971-10-29 1976-06-15 Toyo Kogyo Co., Ltd. Water soluble core for pressure die casting and process for making the same
US4629708A (en) 1983-05-20 1986-12-16 Doulton Industrial Products Limited Moulding
JP2003503210A (ja) * 1999-07-06 2003-01-28 テクノロジー、ユニオン、カンパニー、リミテッド 高圧鋳造用分解性コア、その製造方法、およびその抽出方法
KR20020009334A (ko) 2000-07-26 2002-02-01 김준수 주조용 용해성 코어의 제조방법과 코어 및 그 코어의추출방법
JP2011031276A (ja) * 2009-08-01 2011-02-17 Toyama Prefecture 鋳造用コア
JP2016064436A (ja) * 2014-09-25 2016-04-28 スズキ株式会社 鋳造用塩中子の製造方法および鋳造用塩中子

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4487978A4

Also Published As

Publication number Publication date
KR102576599B1 (ko) 2023-09-08
US20250170637A1 (en) 2025-05-29
EP4487978A4 (en) 2026-04-29
CN118891116A (zh) 2024-11-01
JPWO2023167342A1 (https=) 2023-09-07
EP4487978A1 (en) 2025-01-08

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