US 11,673,189 B2
Method and device for casting a rotor of a compressor, vacuum pump and/or expander device with a longitudinal axis
Victor Adriaens, Wilrijk (BE); Jun Wang, Wuxi (CN); and Jan De Backer, Reet (BE)
Assigned to ATLAS COPCO AIRPOWER, NAAMLOZE VENNOOTSCHAP, Wilrijk (BE)
Appl. No. 17/431,514
Filed by ATLAS COPCO AIRPOWER, NAAMLOZE VENNOOTSCHAP, Wilrijk (BE)
PCT Filed Mar. 3, 2020, PCT No. PCT/IB2020/051790
§ 371(c)(1), (2) Date Aug. 17, 2021,
PCT Pub. No. WO2020/208436, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 2019/5229 (BE), filed on Apr. 9, 2019.
Prior Publication US 2022/0143689 A1, May 12, 2022
Int. Cl. B22C 9/02 (2006.01); B22C 9/22 (2006.01); B22D 25/02 (2006.01); B22D 45/00 (2006.01)
CPC B22D 45/00 (2013.01) [B22C 9/02 (2013.01); B22C 9/22 (2013.01); B22D 25/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for casting a rotor (2) with a longitudinal axis (15) for a compressor, vacuum pump and/or expander device,
wherein the method comprises the following steps:
a. the formation of a green sand mold (3) with a cavity (4), wherein the cavity (4) is configured to contain a core (5) with a mold cavity (6), wherein a surface of the mold cavity (6) is configured to form the rotor (2) in such a way that a longitudinal axis of the mold cavity (6) coincides with the longitudinal axis (15) of the rotor (2) formed in the mold cavity(6);
b. inserting the core (5) into the cavity (4); and
c. pouring molten casting material into the mold cavity (6) through an inlet (7) of the core (5), and filling the mold cavity (6) completely or almost completely with casting material to form the rotor (2),
wherein,
the cavity (4) is held in a tilted position by tilting means (16) during step c, with the longitudinal axis of the mold cavity (6) tilted in relation to a gravitationally vertical direction and in relation to a gravitationally horizontal plane.
 
13. A device for casting a rotor (2) with a longitudinal axis (15) for a compressor, vacuum pump and/or expander device,
wherein the device has been configured to perform a method that comprises the following steps:
a. the formation of a green sand mold (3) with a cavity (4), wherein the cavity (4) is configured to contain a core (5) with a mold cavity (6), wherein a surface of the mold cavity (6) is configured to form the rotor (2) in such a way that a longitudinal axis of the mold cavity (6) coincides with the longitudinal axis (15) of the rotor (2) formed in the mold cavity(6);
b. inserting the core (5) into the cavity (4); and
c. pouring molten casting material into the mold cavity (6) through an inlet (7) of the core (5), and filling the mold cavity (6) completely or almost completely with casting material to form the rotor (2),
wherein the device comprises the green sand mold with the cavity and
the device is provided with tilting means (16) configured to hold the cavity (4) in a tilted position during step c with the longitudinal axis of the mold cavity (6) in relation to a gravitationally vertical direction and in relation to a gravitationally horizontal plane.