第42卷第12期 Vol. 42No. 12
饭
压技
FORGING & STAMPING TECHNOLOGY
铝合金螺旋面挤压过程数值模拟及模具优化
刘厚根1,2，赵贝贝，夏
峰
2017年12月 Dec.
2017
（1.中南大学机电工程学院，潮南长沙，
410083；2.中南大学高性能复杂制造国家重点实验室，潮南长沙
410083）
摘要：采用模拟软件Defom-3D基于热力耦合对6063铝合金螺能面型材挤压成形过程进行模拟，获得了挤压过程中载荷-时间曲线、应变场、应力场、速度场及金属流动情况。结果表明，金属流出工作带后，在同一截面内的应力、应变分布不均
使螺旋面的螺旋升角变小。针对上述间题，提出在模具工作带后面增设可拆卸式矫正器的方法，
型材内部金属发生回弹运动，
保证铝合金螺旋面螺旋角度的精度。最后，通过实验验证了这一方法的可行性，模具优化后螺旋面螺旋升角由11.96°提高至 20.99°，螺旋面精度提高了33.7%
关键词：铝合金；螺能面型材；热挤压；有限元仿真；模具优化 DOI: 10. 13330/j. issn. 1000-3940. 2017. 12. 031
中图分类号：TG376
文献标识码：A
文章编号：1000-3940（2017）12-0169-06
Numerical simulationandmold optimization onextrusionprocessof
aluminum alloy spiral surface Liu Hougen'.2, Zhao Beibei', Xia Feng'
(1. College of Mechanieal and Electrical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083 , China)
Abstract : The extrusion process of aluminum alloy 6063 spiral profile was simulated by software Deform 3D based on the thermo-me-chanical coupling, and the load time curve, strain field, stress field, relocity field and metal flow situation in the extrusion process were obtained. However, after the metal flowed out of working band, the stress and strain distribution of metal in the same cross sextion are une-ven, and the springhack movement occurres in internal metal of profile, which makes the spinal angle of the spinal surface smaller. For the above problems, the method of adding disassembly correction equipment at the back of working band of the mold was put forward to ensure the precision of spiral angle of the spiral surface for aluminum alloy. Finally, the feasibility of this method was verified by experiment. Thus,
the spiral angle of the spiral surface is raised from 11. 96° to 20. 99° after mold optimization, and its accuracy is improved by 41% Key words : aluminium alloy ; spiral profile; hot extrusion; finite element simulation; mold optimization
铝合金螺旋面型材是带有一定螺旋角度的空间曲收稿日期：20170619；修订日期：20170925
基金项目：高性能复杂制造国家重点实验室自主探索基金（2zyjkt2013）；谢南省科技重点研发计划（2015GK3006）
作者简介：刘厚根（1959-），男，颈士，副教投 E-mail: Ihg, esu@ 126. com
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面型材，如图1a所示，应用于如罗茨机械增压器的转子、无油螺杆压缩机的螺杆、转子流量计的转子等。图1b为铝合金螺旋面的端面型线，其为圆弧包络线—渐开线型线(")，单侧齿廊由3部分组成：（1）齿顶CD为心在端面型线中心、率径为r。的圆弧，T。=40mm；（2）齿根AB是另一转子齿顶圆弧在
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