BALL GROOVE MILLING-FREE MACHINING METHOD FOR INNER RACE OF AUTOMOBILE UNIVERSAL JOINT

WIPO Patent Application WO/2023/087849

A1

A ball groove milling-free machining method for an inner race of an automobile universal joint. The method comprises the following steps: blanking; pre-upsetting; pre-forging; inner hole punching; pretreatment; and finish forging, which step comprises performing divided-flow forging on a pre-forged piece (13) by using a divided-flow forging die. The divided-flow forging die comprises a lower die, an upper die (20) and a reaming mandrel (30), wherein a lower-section ball groove profile hole is formed in the lower die; a star-shaped hole (21) and an upper-section ball groove profile hole (22) are formed in the upper die; and the reaming mandrel passes through the star-shaped hole, and a material dividing cavity (40) is formed between the reaming mandrel and a hole wall of the star-shaped hole. A final forged piece (14) is provided, at the upper end, with a divided-flow block (141) formed in the material dividing cavity, and is provided with ball grooves (143) formed in the lower-section and upper-section ball groove profile holes. The method further comprises: finish machining, which step comprises: finishing the ball grooves of the final forged piece, and turning off the outer-circle allowance and the divided-flow block from the final forged piece. In the method, divided-flow forging is performed on a pre-forged piece during final forging, such that the forming force during forging can be reduced, and the dimensional precision and stability of a final forged piece after finish forging can be improved, thereby omitting subsequent milling machining on ball grooves, and thus reducing costs.

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ZENG FAN (CN)
WU BING (CN)
SHEN JIANLONG (CN)
HU YIRUI (CN)

PCT/CN2022/116680

May 25, 2023

September 02, 2022

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SHANGHAI GKN HUAYU DRIVELINE SYSTEMS COMPANY LTD (CN)

B21K1/28; B21J5/02

CN114309442A	2022-04-12
CN110434263A	2019-11-12
CN110216232A	2019-09-10
CN101031375A	2007-09-05
CN102728773A	2012-10-17
JP2008036642A	2008-02-21
CN107717365A	2018-02-23

J.Z.M.C. PATENT AND TRADEMARK LAW OFFICE (GENERAL PARTNERSHIP) (CN)

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