EP3539688A1 - Low-pressure casting multi-sprue process and device for aluminum alloy wheel - Google Patents

Low-pressure casting multi-sprue process and device for aluminum alloy wheel Download PDF

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Publication number
EP3539688A1
EP3539688A1 EP19158971.2A EP19158971A EP3539688A1 EP 3539688 A1 EP3539688 A1 EP 3539688A1 EP 19158971 A EP19158971 A EP 19158971A EP 3539688 A1 EP3539688 A1 EP 3539688A1
Authority
EP
European Patent Office
Prior art keywords
sprue
rim
casting
low
molten aluminum
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.)
Granted
Application number
EP19158971.2A
Other languages
German (de)
French (fr)
Other versions
EP3539688B1 (en
Inventor
Dexi Du
Changhai Li
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.)
CITIC Dicastal Co Ltd
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CITIC Dicastal Co Ltd
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Publication of EP3539688A1 publication Critical patent/EP3539688A1/en
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    • 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
    • B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
    • 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
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/065—Cooling or heating equipment for moulds
    • 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
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2218—Cooling or heating equipment for dies
    • 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
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2272—Sprue channels

Definitions

  • the present invention provides a low-pressure casting multi-sprue process and device for an aluminum alloy wheel.
  • the conventional low-pressure casting of aluminum alloy wheels mostly adopts a center bottom injection process.
  • Molten aluminum enters a mold cavity through a center sprue, flows across the spokes of a wheel, and then turns to fill the rim vertically, until the filling is completed.
  • the rim is at a distal end far away from the center sprue and is solidified first. Therefore, it is necessary to preferentially feed the rim by the spokes to delay the crystallization and solidification time of the spokes, which affects the mechanical properties of the aluminum alloy wheel materials.
  • the elongation of the spokes is generally low, which directly affects the overall quality of the wheel.
  • the object of the present invention is to overcome the defects of the prior art, improve the quality of an aluminum alloy wheel and provide a low-pressure casting process and device for an aluminum alloy wheel, which focus on improving the elongation of spokes of the wheel and improving the casting production efficiency at the same time.
  • the technical solution adopted by the invention is: a low-pressure casting multi-sprue process for an aluminum alloy wheel adopts a multi-sprue casting method, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum, and is pressurized and cooled after the mold cavity is full of the molten aluminum.
  • Top mold coolers are also ring water coolers, the water coolers are located on a top mold above the spokes, and a center water cooler is adopted in the center of the top mold to cool the center sprue.
  • the molten aluminum in the cavity crystallizes in sequence with the cooling of the mold.
  • the crystallization progresses from the outer rim to the rim and the spokes at the same time until the inner rim and the center of the wheel are finally solidified, completing the entire casting process.
  • the front sides of the spokes and the outer rim of the wheel casting are upward, and the rim and the inner rim are at the lower part.
  • the plurality of sprues at the inner rim are arranged directly below the inner rim, the sprues are circular, and the number of the sprues varies according to the size of the wheel and is at least 8.
  • the center sprue is arranged directly below the center of the wheel, and is circular.
  • the side mold ring water cooler and the top mold ring water cooler are 15-40 mm away from the surface of the casting, and the flow rate of the cooling water is 150-400 L/hr.
  • a low-pressure casting device for an aluminum alloy wheel includes a cooling forming mold system and a pressure casting system, the casting device includes a multi-sprue mold, the lower part of the mold communicates with a sprue basin and is fixedly mounted on a machine bed plate, a low-pressure holding furnace is below the machine bed plate, and the molten aluminum in the furnace is connected to the central inlet of the sprue basin via a riser tube.
  • Atop mold and a side mold of the low-pressure casting mold are connected with a hydraulic control system of a machine, and the top mold is provided with an ejection mechanism for de-molding the casting.
  • a plurality of sprues are arranged at the junction of the sprue basin and the mold, a sprue bushing made of ceramic is arranged at each sprue, and the molten aluminum is finally crystallized and solidified at the sprue in the pressure feeding phase after filling of the molten aluminum.
  • the filling time of the molten aluminum is shortened by half and the filling production efficiency is improved; the outer rim begins to solidify in the cooling process, and the spokes and the rim are simultaneously solidified in sequence, so that the crystallization and solidification time of the casting at the rim and the spokes is greatly shortened, the compactness of the internal structure of the casting is improved, the mechanical properties of the materials are good, and particularly, the elongation of the spokes is greatly improved; at the same time, the entire casting device is simple; and a sprue basin is added on the basis of ordinary low-pressure center casting, so that the whole process is simple and easy to operate.
  • Fig. 1 is a casting schematic diagram of a low-pressure multi-sprue process according to the present invention.
  • a low-pressure casting multi-sprue process device for an aluminum alloy wheel mainly includes a mold cooling system and a pressure casting system.
  • the casting mold includes a bottom mold (2), atop mold (4), a side mold (3) and a casting ejection rod (8).
  • the entire mold is placed on a sprue basin (1).
  • the mold cavity communicates with the sprue basin through a plurality of sprue bushings (11).
  • the sprue basin is assembled on a machine bed plate (12) of a low-pressure casting main machine, a riser tube (13) is mounted therebetween to communicate with molten aluminum in a holding furnace (14), and the molten aluminum enters the sprue basin under the action of pressure through the riser tube, and then enters the mold cavity through the sprue bushings.
  • the mold cooling system includes side mold ring water coolers (9) and (10), top mold ring water coolers (6) and (7) and a center sprue spreader water cooler (5).
  • the side mold ring water coolers are quickly started after the mold is full of the molten aluminum, a casting begins to crystallize and solidify at the outer rim, and the top mold ring water coolers and the center water cooler are sequentially started until the casting is solidified in sequence.

Abstract

Disclosed are a low-pressure casting multi-sprue process and device for an aluminum alloy wheel. A multi-sprue casting method is adopted, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum, and is pressurized and cooled after the mold cavity is full of the molten aluminum. During cooling, starting from the outer rim of the wheel filled with the molten aluminum last, side mold ring water coolers are started. The outer rim begins to solidify in the cooling process, and the spokes and the rim are simultaneously solidified in sequence, so that the crystallization and solidification time of the casting at the rim and the spokes is greatly shortened, the compactness of the internal structure of the casting is improved while the production efficiency is improved, the mechanical properties of the materials are good, and particularly, the elongation of the spokes is greatly improved.

Description

    Field of the Invention
  • The present invention provides a low-pressure casting multi-sprue process and device for an aluminum alloy wheel.
    • Background of the Invention
  • At present, the conventional low-pressure casting of aluminum alloy wheels mostly adopts a center bottom injection process. Molten aluminum enters a mold cavity through a center sprue, flows across the spokes of a wheel, and then turns to fill the rim vertically, until the filling is completed. In the process of crystallization and solidification, the rim is at a distal end far away from the center sprue and is solidified first. Therefore, it is necessary to preferentially feed the rim by the spokes to delay the crystallization and solidification time of the spokes, which affects the mechanical properties of the aluminum alloy wheel materials. Particularly, the elongation of the spokes is generally low, which directly affects the overall quality of the wheel.
    • Summary of the Invention
  • The object of the present invention is to overcome the defects of the prior art, improve the quality of an aluminum alloy wheel and provide a low-pressure casting process and device for an aluminum alloy wheel, which focus on improving the elongation of spokes of the wheel and improving the casting production efficiency at the same time.
  • The technical solution adopted by the invention is: a low-pressure casting multi-sprue process for an aluminum alloy wheel adopts a multi-sprue casting method, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum, and is pressurized and cooled after the mold cavity is full of the molten aluminum.
  • During cooling, starting from the outer rim of the wheel filled with the molten aluminum last, side mold ring water coolers are started, and the water coolers are close to the thick portions of the junctions of the spokes of the outer rim and the rim. Top mold coolers are also ring water coolers, the water coolers are located on a top mold above the spokes, and a center water cooler is adopted in the center of the top mold to cool the center sprue.
  • By controlling the cooling time and the flow rate, the molten aluminum in the cavity crystallizes in sequence with the cooling of the mold. The crystallization progresses from the outer rim to the rim and the spokes at the same time until the inner rim and the center of the wheel are finally solidified, completing the entire casting process.
  • In the low-pressure casting process, the front sides of the spokes and the outer rim of the wheel casting are upward, and the rim and the inner rim are at the lower part.
  • The plurality of sprues at the inner rim are arranged directly below the inner rim, the sprues are circular, and the number of the sprues varies according to the size of the wheel and is at least 8.
  • The center sprue is arranged directly below the center of the wheel, and is circular.
  • The side mold ring water cooler and the top mold ring water cooler are 15-40 mm away from the surface of the casting, and the flow rate of the cooling water is 150-400 L/hr.
  • A low-pressure casting device for an aluminum alloy wheel includes a cooling forming mold system and a pressure casting system, the casting device includes a multi-sprue mold, the lower part of the mold communicates with a sprue basin and is fixedly mounted on a machine bed plate, a low-pressure holding furnace is below the machine bed plate, and the molten aluminum in the furnace is connected to the central inlet of the sprue basin via a riser tube.
  • Atop mold and a side mold of the low-pressure casting mold are connected with a hydraulic control system of a machine, and the top mold is provided with an ejection mechanism for de-molding the casting.
  • A plurality of sprues are arranged at the junction of the sprue basin and the mold, a sprue bushing made of ceramic is arranged at each sprue, and the molten aluminum is finally crystallized and solidified at the sprue in the pressure feeding phase after filling of the molten aluminum.
  • Since a plurality of small sprues are arranged below the inner rim of the wheel and a center sprue is arranged in the center of the wheel at the same time, the filling time of the molten aluminum is shortened by half and the filling production efficiency is improved; the outer rim begins to solidify in the cooling process, and the spokes and the rim are simultaneously solidified in sequence, so that the crystallization and solidification time of the casting at the rim and the spokes is greatly shortened, the compactness of the internal structure of the casting is improved, the mechanical properties of the materials are good, and particularly, the elongation of the spokes is greatly improved; at the same time, the entire casting device is simple; and a sprue basin is added on the basis of ordinary low-pressure center casting, so that the whole process is simple and easy to operate.
    • Brief Description of the Drawing
  • The present invention will be further illustrated below in conjunction with the drawing and embodiments.
  • Fig. 1 is a casting schematic diagram of a low-pressure multi-sprue process according to the present invention.
    • Detailed Description of the Embodiments
  • In Fig. 1, a low-pressure casting multi-sprue process device for an aluminum alloy wheel according to the present invention mainly includes a mold cooling system and a pressure casting system. The casting mold includes a bottom mold (2), atop mold (4), a side mold (3) and a casting ejection rod (8). The entire mold is placed on a sprue basin (1). The mold cavity communicates with the sprue basin through a plurality of sprue bushings (11). The sprue basin is assembled on a machine bed plate (12) of a low-pressure casting main machine, a riser tube (13) is mounted therebetween to communicate with molten aluminum in a holding furnace (14), and the molten aluminum enters the sprue basin under the action of pressure through the riser tube, and then enters the mold cavity through the sprue bushings.
  • The mold cooling system includes side mold ring water coolers (9) and (10), top mold ring water coolers (6) and (7) and a center sprue spreader water cooler (5). The side mold ring water coolers are quickly started after the mold is full of the molten aluminum, a casting begins to crystallize and solidify at the outer rim, and the top mold ring water coolers and the center water cooler are sequentially started until the casting is solidified in sequence.

Claims (4)

  1. A low-pressure casting multi-sprue process for an aluminum alloy wheel, characterized in that the casting process adopts a multi-sprue casting method, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, and then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum;
    during cooling, starting from the outer rim of the wheel filled with the molten aluminum last, side mold ring water coolers are started, and the water coolers are close to the thick portions of the junctions of the spokes of the outer rim and the rim; top mold coolers are also ring water coolers, the water coolers are located on a top mold above the spokes, and a center water cooler is adopted in the center of the top mold to cool the center sprue.
  2. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, characterized in that in the low-pressure casting process, the front sides of the spokes and the outer rim of the wheel casting are upward, and the rim and the inner rim are at the lower part.
  3. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, characterized in that a plurality of sprues are arranged directly below the inner rim, a center sprue is arranged in the center, and the sprues are circular.
  4. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, characterized in that side mold ring water coolers and the top mold ring water coolers are 15-40 mm away from the surface of the casting, the flow rate of cooling water is 150-400 L/hr, and the side mold ring water coolers need to be started immediately after the mold cavity is full of the molten aluminum.
EP19158971.2A 2018-03-13 2019-02-23 Low-pressure casting multi-sprue process and device for aluminum alloy wheel Active EP3539688B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810204230.8A CN108284212A (en) 2018-03-13 2018-03-13 A kind of more de-gating process of aluminum-alloy wheel low pressure casting and its device

Publications (2)

Publication Number Publication Date
EP3539688A1 true EP3539688A1 (en) 2019-09-18
EP3539688B1 EP3539688B1 (en) 2022-07-06

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EP19158971.2A Active EP3539688B1 (en) 2018-03-13 2019-02-23 Low-pressure casting multi-sprue process and device for aluminum alloy wheel

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US (1) US20190283122A1 (en)
EP (1) EP3539688B1 (en)
CN (1) CN108284212A (en)
MA (1) MA45320B1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN115041664A (en) * 2022-04-29 2022-09-13 河南科技大学 Low-pressure pouring liquid die forging forming die and forming method of automobile wheel

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
CN110303136B (en) * 2019-07-11 2021-03-26 北京航空航天大学青岛研究院 Casting method for improving mechanical property of large-size aluminum alloy wheel
CN110918940B (en) 2019-12-18 2021-12-31 内蒙古工业大学 Casting device and casting method for large-scale non-ferrous metal thin-wall structural part
CN112536970B (en) * 2020-11-23 2023-04-25 刘自福 Full-automatic data line injection molding system
WO2023018964A1 (en) * 2021-08-12 2023-02-16 Superior Industries International Inc. Multi-gate molten feedbox system
CN115495454B (en) * 2022-09-30 2023-05-30 中信戴卡股份有限公司 Characterization method for casting molding process of aluminum wheel

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GB2253171A (en) * 1991-02-27 1992-09-02 Honda Motor Co Ltd Method of casting vehicle wheel
JPH07155928A (en) * 1993-12-02 1995-06-20 Toshiyuki Tsukamoto Mold structure for vehicle wheel
JP2000237862A (en) * 1999-02-17 2000-09-05 Hitachi Metals Ltd Low pressure casting method of wheel for vehicle and metallic mold therefor
CN104785732A (en) * 2015-04-22 2015-07-22 成都陵川特种工业有限责任公司 Wheel hub casting mold
CN207723471U (en) * 2018-01-18 2018-08-14 内蒙古霍煤车轮制造有限公司 A kind of aluminum-alloy wheel low pressure casting water mist cooling mold

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CN203281820U (en) * 2013-05-28 2013-11-13 江苏东方龙机车集团有限公司 Hub casting mold able to optimize cooling effect
CN203917867U (en) * 2014-07-14 2014-11-05 中信戴卡股份有限公司 Wheel low pressure casting die is revolved in casting
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Publication number Priority date Publication date Assignee Title
GB2253171A (en) * 1991-02-27 1992-09-02 Honda Motor Co Ltd Method of casting vehicle wheel
JPH07155928A (en) * 1993-12-02 1995-06-20 Toshiyuki Tsukamoto Mold structure for vehicle wheel
JP2000237862A (en) * 1999-02-17 2000-09-05 Hitachi Metals Ltd Low pressure casting method of wheel for vehicle and metallic mold therefor
CN104785732A (en) * 2015-04-22 2015-07-22 成都陵川特种工业有限责任公司 Wheel hub casting mold
CN207723471U (en) * 2018-01-18 2018-08-14 内蒙古霍煤车轮制造有限公司 A kind of aluminum-alloy wheel low pressure casting water mist cooling mold

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115041664A (en) * 2022-04-29 2022-09-13 河南科技大学 Low-pressure pouring liquid die forging forming die and forming method of automobile wheel
CN115041664B (en) * 2022-04-29 2024-03-15 河南科技大学 Low-pressure casting liquid die forging forming die for automobile wheels and forming method thereof

Also Published As

Publication number Publication date
MA45320A (en) 2020-08-26
MA45320B1 (en) 2022-09-30
US20190283122A1 (en) 2019-09-19
CN108284212A (en) 2018-07-17
EP3539688B1 (en) 2022-07-06

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