Transactions of Materials and Heat Treatment

Title：Study on defect analysis and optimal design of sleeve in cold extrusion

Authors： Chen Lei1 Yao Guoping2 Ying Hao3

Unit： 1.Hangzhou Dianzi University 2. Zhejiang Kangling Industry Co. Ltd. 3.Zhejiang Institute of Mechanical & Electrical Engineering Co. Ltd.

KeyWords： cold extrusion numerical simulation blank design

ClassificationCode：

year,vol(issue):pagenumber：2015,40(10):65-68

Abstract：

Cold extrusion is an advanced and environmental-friendly manufacturing technology. It suits for the manufacture of transmission parts. The defects happen frequently owing to the large deformation of blank, complex materials flow and difficult in designing mould and blank. For the cold extrusion of the sleeve, according to the technical characters of the sleeve, the cold extrusion method was determined. The extrusion dies were designed. The cracking defect in the cold extrusion was analyzed by numerical simulation. The simulation and experiment results were compared by the materials tracking and profile comparison. Therefore, the cause of the crack source was that the large opening hole folding on the edge of hole. Therefore, the hole size in the blank was optimized，the crack was eliminated and the best forming scheme was achieved.

Funds：

浙江省科技厅公益性研究项目（2014C31092）

陈磊（1979-），男，博士，副教授

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