Transactions of Materials and Heat Treatment

Title：Design and research of cold extrusion process for oil valve sleeve

Authors： Yang Ning Tian Haiyang Xue Huipeng Zheng Weigang

Unit： Guizhou University

KeyWords： oil valve sleeve cold extrusion slip line field Qform2D/3D

ClassificationCode：

year,vol(issue):pagenumber：2015,40(7):53-57

Abstract：

A cold extrusion process was determined preliminarily by a structure analysis on the oil valve sleeve. The extrusion forming process was simulated by Qform2D / 3D software，and the stress and strain in the parts during the forming process were analyzed, and the material filling situation was observed. After trial production，it is found that the forming pressure is too high, and the punch is broken. In view of the above problems, the original scheme was modified. A new process of forming hexagonal in advance was designed. Based on the theory of slip line field, the extrusion force was calculated by graph algorithm. Then the forming process was simulated again. The results show that the extrusion force is within the allowable stress range of punch. Meanwhile， surface cracking is avoided by applying combined punch structure and strengthening lubrication. The feasibility of the new scheme is verified by producing sample, and the size accuracy can meet the requirement of performance specification.

Funds：

贵州省科学技术厅、贵州大学联合资金项目（黔科合LH字\[2014\]7622号）

杨宁（1973-），男，硕士，副教授

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