Transactions of Materials and Heat Treatment

Title：Research on wear performance of reverse extrusion punch for automotive deep hole nut based on numerical simulation

Authors： Zhang Yuhang Zhang Jiarui

Unit： Chongqing Technology & Business Institute

KeyWords： punch wear deep hole nut composite coating wear model wear amount

ClassificationCode：TG376.3

year,vol(issue):pagenumber：2022,47(2):180-185

Abstract：

For the problems of serious wear, frequent replacement and high scrap rate of punch during one-time extrusion forming process of a deep hole nut parts, the coating on the punch surface and the improvement of punch structure were proposed to minimize the punch wear, and based on the numerical analysis software DEFORM-3D, the wear model of punch and the extrusion simulation model were established. Then, the wear conditions of uncoated punch, single-coated punch and TiN-TiCN composite coating punch with different film thicknesses during the extrusion process were studied, and the important parameters of punch were optimized by orthogonal test method. The results show that the wear of uncoated punch is the most serious, and the wear for TiN-TiCN composite coating punch with the film thickness of 4 μm is the smallest. When the front angle of punch is 8°, the transition angle is 33°, the fillet radius is 0.2 mm and the outer diameter of head is Φ19.46 mm, the wear amount of punch is the smallest. It has been proved that the service life of punch with coating technology and optimal parameters is increased by 5.5 times.

Funds：

重庆市教育委员会科学技术研究项目（KJQN202104013）；重庆自然科学基金资助项目（cstc2020jcyj-msxmX0940）

作者简介：张宇杭（1989-），女，硕士，讲师，E-mail：jackson1211@sohu.com

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