Transactions of Materials and Heat Treatment

Title：Deformation analysis and die design of cold heading extrusion for a conical nut based on numerical simulation

Authors： Liang Jianping1 Cheng Wangjun2

Unit： 1. China CNR Corporation 2.Taiyuan University of Technology

KeyWords： conical nut cold heading extrusion numerical simulation die design

ClassificationCode：

year,vol(issue):pagenumber：2015,40(7):151-155

Abstract：

A new cold heading extrusion process for forming a conical nut was presented，and the forming process was simulated by three-dimensional finite element software Deform-3D. The distributions of the flow velocity field and the temperature field of the tubular billets in the process of filling the die cavity were obtained, respectively. The results show that the die cavity can be fully filled by the plastic deformation process of tubular billets. The threads of the forming conical nut are completely full and without larger flashes and broken material gaps. The phenomena of a large area of uneven temperature and hot damage do not occur during the whole extrusion process，which indicates that cold heading extrusion process for producing a conical nut by tubular billet is feasible. Finally, a set of die structure for cold heading extrusion of the conical nut was designed and the result was validated by the test.

Funds：

国家自然科学基金资助项目 (51274149)

梁建平 (1968-), 男，学士，高级工程师

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