US 11,684,965 B2
Method for forming large-size QCr0.8 alloy tapered cylindrical ring
Jing Zhang, Shaanxi (CN); Jinwu Miao, Shaanxi (CN); Yanpei Shi, Shaanxi (CN); Kai Wang, Shaanxi (CN); Zhimin Chen, Shaanxi (CN); Yang Ding, Shaanxi (CN); and Guojin Zhang, Shaanxi (CN)
Assigned to Xi'an Space Engine Company Limited, Xi'an (CN)
Filed by Xi'an Space Engine Company Limited, Shaanxi (CN)
Filed on Nov. 17, 2021, as Appl. No. 17/528,343.
Claims priority of application No. 202011311170.3 (CN), filed on Nov. 20, 2020.
Prior Publication US 2022/0097123 A1, Mar. 31, 2022
Int. Cl. B21D 53/16 (2006.01); B21J 5/02 (2006.01); C22C 9/02 (2006.01)
CPC B21D 53/16 (2013.01) [B21J 5/02 (2013.01); C22C 9/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for forming a QCr0.8 alloy tapered cylindrical ring, comprising:
(S1) heating a raw material to 750-850° C. followed by upsetting and stretching at least twice to obtain a primary blank;
wherein the raw material is a standard cylindrical part made of QCr0.8 alloy;
(S2) heating the primary blank to 750-850° C. followed by upsetting and chamfering to obtain a secondary blank with a top end and a bottom end; wherein a diameter of the top end of the secondary blank is greater than a diameter of the bottom end of the secondary blank;
(S3) subjecting the secondary blank to backward extrusion to process the top end and the bottom end of the secondary blank to obtain a preform;
(S4) machining the preform to remove a flash and a bottom residue of the preform;
(S5) subjecting a bottom end of the preform to local bulging to enable a shape and a size of the bottom end of the preform to match a shape and a size of a drive roller in a forming tooling, so as to form a profiled ring blank; and
(S6) rolling the profiled ring blank by using a radial-axial ring rolling machine in combination with the forming tooling to form a tapered cylindrical ring;
wherein the step (S3) is performed through steps of:
heating the secondary blank to 750-850° C. at a heating coefficient of 0.4-0.6 min/mm;
subjecting the secondary blank to one-step extrusion molding on a press machine; and
performing air cooling after forging to form the preform with a cone angle of 40-90° and a bottom diameter of Φ330-480 mm;
wherein a final forging temperature is not less than 650° C.