Transactions of Materials and Heat Treatment

Title：Research on multi-position cold forging process and die design for shafts

Authors： Xia Juchen Jin Junsong Deng Lei1 Wang Xinyun Xia Hanguan Dong Yi Wang Yaozu

Unit： Huazhong University of Science and Technology

KeyWords： shaft multi-position cold forging die cold shrink ironing extrusion semi-closed upsetting

ClassificationCode：

year,vol(issue):pagenumber：2014,39(10):58-62

Abstract：

According to the shape characteristics of shafts, a multi-position process of combination of cold shrink extrusion and semi-closed upsetting was proposed, relatively, the process optimization method and six principles of die design were put forward. A five-position-cold forging process and relative dies were designed for a car driving shaft. After the hardness ≤140~150 HBS of rod blanks through ball annealing, cleaning up oxide coating and phosphating treatment, the multi-position process experiments were carried out by using both single-station die on Y28-400/400 double action hydraulic press and multi-station die on YK34J-1600 five-station hydraulic press. The results show that the forgings obtained by the process have fine dimensional accuracy and quality, the material utilization reaches 90%~95%, and the surface roughness reaches Ra0.4-0.8 μm. The designed die has long service life and is reasonable for manufacturing, fixing and repairing.

Funds：

国家科技重大专项资助项目（2011ZX04016-051）

夏巨谌（1941-），男，本科，教授

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