US 11,752,548 B2
Die casting method for filtering cavity
Ying Zhang, Zhuhai (CN); Jie Tan, Zhuhai (CN); Jicheng Wang, Zhuhai (CN); Gunan Li, Zhuhai (CN); Ziqiang Huang, Zhuhai (CN); and Huaide Ren, Zhuhai (CN)
Assigned to ZHUHAI RUNXINGTAI ELECTRICAL CO., LTD, Zhuhai (CN)
Appl. No. 17/413,762
Filed by ZHUHAI RUNXINGTAI ELECTRICAL CO., LTD, Zhuhai (CN)
PCT Filed Dec. 2, 2019, PCT No. PCT/CN2019/122416
§ 371(c)(1), (2) Date Jun. 14, 2021,
PCT Pub. No. WO2020/119502, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 201811532158.8 (CN), filed on Dec. 14, 2018.
Prior Publication US 2022/0032364 A1, Feb. 3, 2022
Int. Cl. B22D 43/00 (2006.01); B22F 1/148 (2022.01); B22D 1/00 (2006.01); B22D 17/00 (2006.01); B22D 27/02 (2006.01); C22F 1/04 (2006.01); B22F 9/08 (2006.01)
CPC B22D 43/004 (2013.01) [B22D 1/00 (2013.01); B22D 17/007 (2013.01); B22D 27/02 (2013.01); B22F 1/148 (2022.01); C22F 1/04 (2013.01); B22F 9/08 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A die casting method for a filtering cavity comprising:
transferring an aluminum alloy liquid to a stirrer including:
an electromagnetic inductor; and
a stirring rod arranged across an inside of the stirrer;
covering the stirrer and evacuating air inside the stirrer;
starting the stirrer to stir the aluminum alloy liquid under an airtight vacuum condition, the aluminum alloy liquid being simultaneously subjected to:
an electromagnetic stirring in a direction of a magnetic field generated by the electromagnetic inductor; and
a mechanical stirring under a rotation action of the stirring rod;
continuing stirring the aluminum alloy liquid for 20-80 minutes until the aluminum alloy liquid becomes semisolid to obtain a semisolid aluminum alloy slurry, a temperature of the semisolid aluminum alloy slurry being 550-650° C.; and
injecting the semisolid aluminum alloy slurry into a filter die to perform die casting molding at an injection speed of 1.5-2.5 m/s, an injection specific pressure of 30-80 MPa, a pressurization pressure of 60-80 MPa, and a temperature of the filter die of 250-400° C., and maintaining pressure for 7-30 seconds to obtain the filtering cavity.