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Abstract：
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Taking the cold heading formed fixing nut of a municipal pipe gallery as an example, the lower punch of station four during cold heading process of nut was optimized by finite element software Deform-3D based on Archard wear theory. Then, the influences of stamping speed, hardness of mold surface, fillet radius of mould core and friction coefficient on the wear of lower punch were obtained by orthogonal test. The obtained optimum parameters were the punching speed of 5 mm·s-1, the hardness of mould surface surface of 58 HRC, the fillet radius of mould core of 3 mm and the friction coefficient of 0.13. Through the simulation analysis with optimal parameters, the maximum wear of lower punch was 2.93×10-5 mm, which was reduced significantly compared with that before optimization，and then the service life of lower punch was predicted based on simulation results. Moreover, a mould test was carried out with the optimal parameters. And the workpiece has a good quality without material defects such as folding and nap，which meets the production requirements and provides a theoretical basis for actual production.
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Funds：
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企业横向项目 (J2015-272)
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AuthorIntro：
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石君（1981-），女，硕士，讲师
E-mail：42883679@qq.com
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Reference：
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