Transactions of Materials and Heat Treatment

Title：Durability research on precision forging die for claw pole

Authors： Yang Cheng1 Zhang Jinhu1 Xu Chen1 Zhuang Xiaowei2 Liu Wu2 Wang Ling2

Unit： 1.School of Metallurgical Engineering Xi′an University of Architecture and Technology 2. Longcheng Precision Forging Group Co. Ltd.

KeyWords： claw pole precision forging die wear failure die service life convex rib

ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(12):168-174

Abstract：

In order to prevent the premature failure of die caused by the local dimensional deviation at the convex rib of lower die for claw pole precision forging, the reasons for the low service life of precision forging die for claw pole were analyzed by the finite element method, and it was found that the wear failure was the main factor causing the dimensional deviation at the convex rib of lower die for claw pole precision forging. Then, based on the characteristics of forging die cavity for claw pole, the forming process was improved, and the protrusion corresponding to the position and size of convex rib in the precision forging lower die was set in the pre-forging upper die for claw pole, which could effectively reduce the temperature, relative sliding speed and contact stress at the convex rib of precision forging lower die, and make the wear amount of a single forging pass from 1.08×10-5 mm before optimization reduce to 3.65×10-6 mm. Furthermore, the improved forgings had no defects such as folds, turbulence and eddy currents, and according to the optimized scheme, the die produced under the optimized scheme was verified in actual production. The results show that the optimized scheme increases the average service life of the precision forging lower die for claw pole from 5000 pieces before optimization to 6000 pieces.

Funds：

国家自然科学基金资助项目（51874226）；西安市科技局科技创新引导项目（201805033YD11CG17）；陕西省重点研发计划项目(2018ZDXM-GY-120)

杨程(1976-)，男，博士，副教授 E-mail：yang.cheng@ stu.xjtu.edu.cn

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