US 11,858,032 B2
High-temperature alloy pressure casting mold and casting process for impeller and guide vane
Juming Zhou, Shanghai (CN)
Assigned to SHANGHAI CHANGQIANG INDUSTRIAL TECHNOLOGY LIMITED COMPANY, Shanghai (CN)
Appl. No. 17/596,174
Filed by SHANGHAI CHANGQIANG INDUSTRIAL TECHNOLOGY LIMITED COMPANY, Shanghai (CN)
PCT Filed Jun. 4, 2019, PCT No. PCT/CN2019/089968
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/243900, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 201910475916.5 (CN), filed on Jun. 3, 2019.
Prior Publication US 2022/0241848 A1, Aug. 4, 2022
Int. Cl. B22D 17/22 (2006.01); B22C 9/06 (2006.01); B22C 9/20 (2006.01)
CPC B22C 9/20 (2013.01) [B22C 9/065 (2013.01); B22D 17/2218 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A high-temperature alloy pressure casting process for casting of impellers and guide vanes, the high-temperature alloy pressure casting process comprising:
injecting liquid steel into a casting main pipe in a middle of the mold, keeping metal inclusions in the liquid steel suspended on a liquid surface of the liquid steel, and maintaining a height difference between the liquid surface of the liquid steel and the top of an inner surface of a forming steel mold at 120 mm-400 mm;
pressurizing the casting main pipe so that the liquid steel in the casting main pipe flows into a lower casting pipe and flows into each forming steel mold from bottom to top through a casting gate;
transferring pressure obtained by the casting main pipe to the liquid steel in the forming steel mold during crystallization of the liquid steel in the forming steel mold, so that the liquid steel fills an inner cavity of the forming steel mold;
waiting 3-5 minutes to allow the liquid steel in the forming steel mold to crystallize and form the impeller and guide vane casting, with the liquid steel at the casting gate being in a liquid state;
filling shrinkage cavities with the liquid steel at the casting gate to form risers; and
cooling and demolding of an impeller and guide vane casting.