US 12,318,971 B2
Mold for partially shortening circumference of tube billet and using method of mold
Guannan Chu, Weihai (CN); Lei Sun, Weihai (CN); and Anying Yuan, Weihai (CN)
Assigned to CHU, GUANNAN, Weihai (CN); and HARBIN INSTITUTE OF TECHNOLOGY, WEIHAI, Weihai (CN)
Filed by Guannan Chu, Weihai (CN); and Harbin Institute of Technology, Weihai, Weihai (CN)
Filed on Jun. 16, 2022, as Appl. No. 17/841,746.
Claims priority of application No. 202110664990.9 (CN), filed on Jun. 16, 2021.
Prior Publication US 2022/0402176 A1, Dec. 22, 2022
Int. Cl. B29C 43/36 (2006.01); B29C 43/02 (2006.01); B29C 48/03 (2019.01); B29C 48/32 (2019.01); B29L 23/00 (2006.01)
CPC B29C 43/36 (2013.01) [B29C 43/027 (2013.01); B29C 48/131 (2019.02); B29C 48/32 (2019.02); B29C 2043/028 (2013.01); B29C 2043/3665 (2013.01); B29L 2023/22 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A mold for partially shortening the circumference of a tube billet, comprising an upper mold, a lower mold and a mold core used for being inserted into a tube cavity of the tube billet, the upper mold being provided with an upper mold cavity, the lower mold being provided with a lower mold cavity, and the upper mold cavity and the lower mold cavity being matched to form a mold cavity, wherein after the mold core is placed in the mold cavity, a tube billet deformation cavity is formed in the mold cavity, and an outer contour of the mold core is configured to be deviated inwards by a distance of t+a compared with inner surfaces of the upper mold and the lower mold, wherein t is the wall thickness of an initial tube billet that is selected and a is larger than 0.05 mm and smaller than 10 mm; and the upper mold cavity and/or the lower mold cavity are/is in the shape of a flaring, the two sides of the flaring are arc-shaped, and included angles are formed between the two sides of the flaring and the moving direction of the upper mold and/or lower mold.