Transactions of Materials and Heat Treatment

Title：Influence of corner radius of knock-out pin on spider cold forging process

Authors： Wei Kunxia1 2 Niu Ling1 Wei Wei1 2 Du Qingbo1 Hu Jing1 2

Unit： 1.Changzhou University 2. Jiangsu Key Laboratory of Materials Surface Science and Technology

KeyWords： spider Deform 3D corner radius of knock-out pin cold forging finite element analysis

ClassificationCode：

year,vol(issue):pagenumber：2015,40(10):60-64

Abstract：

The spider is an important part of the constant velocity universal joint. 3D models of spider cold forging die and workpiece were set up by Solidworks. The influences of corner radius of knock-out pin on forming defects, equivalent stress distribution, equivalent strain distribution and load-stroke curves in the process of cold forging were investigated by a large-scale finite element analysis Deform 3D software. The results show that when top convex platform diameter D1 of knock-out pin is Ф24 mm, its bottom convex platform diameter D2 is Ф22 mm, and its speed is 10 mm·s-1, the increased bottom corner radius R2 can diminish and even eliminate forming defects of the bases of spider pins. However, the top corner radius R1 has little effect on the spider cold forging process. The maximum equivalent stress and the equivalent strain occur close to the middle hole of spider and the bases of spider pins. It is proposed for the spider cold forging that the top corner radius R1 of knock-out pin is 2 mm and the bottom corner radius R2 of knock-out pin is 10 mm, which is verified by actual experiments.

Funds：

江苏省自然科学基金资助项目（BK2012594、BK20131144）；常州市科技局项目（CZ20130021）

魏坤霞（1973-），女，硕士，副教授

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