第43卷第2期 Vol. 43No. 2
叙压技木
FORGING & STAMPING TECHNOLOGY
旋转通道等径角平行挤压模具应力分析
2018年2月 Feb.2018
张婷，何敏，原浩，颜林泉，达成，丁鹏，周凡哲，姚倩楠
（徐州工程学院机电工程学院，江苏徐州221111）
摘要：为制备超细晶结构时效硬化型铝合金提出了旋转通道等径角平行挤压工艺，针对该工艺建立模具模型，采用Deform-3D 软件对能转通道等径角平行挤压模具进行了应力分析。利用容差值插值计算法，
获得容差值与挤压模具力的关系，得出旋转
通道模具的应力分布规律及容差值对模具应力的影响规律。结果表明：过小的容差值，会导致成形力与模具力相差较大；过大的容差值，并不一定能提高计算精度，但会增大计算量；准确的容差值是成形力映射到模具获得模具应力的关键，该工艺
中模具应力分析容差值应为1。模具外壁50MPa为安全载荷，线性外推法获得模具厚度为40mm
应力集中区域在旋转通道与直通道过渡处。此安全载荷下通过
关键词：旋转通道等径角平行挤压；模具应力分析；容差值；Deform-3D；模具厚度 DOI: 10. 13330/j. issn. 1000-3940. 2018. 02. 026
中图分类号：TG375*.41
文献标识码：A
文章编号：1000-3940（2018）02-0157-05
Stress analysis on parallel extrusion die with rotated channel and equal angular
Zhang Ting, He Min, Yuan Hao, Yan Linquan, Da Cheng, Ding Peng, Zhou Fanzhe, Yao Qiannan(School of Mechanical and Electrical Engineering, Xuzhou University of Technology, Xuzhou 221111, China)
Abstract : In order to prepare age hardened aluminum alloy with ultra-fine grain structure, a paralled extrusion process with rotated chan nel and equal angular was proposed. Then, the die model was built, and the die stress analysis on parallel extrusion die with rotated chan-nel and equal angular was conducted by software Defom-3D. Furthermore, the relationship between tolerance value and extnusion force was obtained, and the stress distribution and the influence of tolerance value on die stress were obtained by tolerance interpolation calcula-tion method. The results show that the small tolerance value leads to a great difference between foming force and extrusion force, and an excessive tolerance value may not improve the calculation accuracy and can increase the calculation complexity., However, the exact toler. ance value is the key to obtain die stress after mapping the forming force to the die, and the tolerance value is designed as 1. Thus, the safe load at die edge is set as 50 MPa, and the stress concentration region locates at the transition behween rotating channel and straight channel. Finally, the die thickness is designed as 40 mm by the method of linear extrapolation.
Key words : parallel extrusion with rotated channel and equal angular; die stress analysis; tolerance value; Deform-3D; die thickness
随着高速轨道交通、微机电系统、工程机械轻量化技术的快速发展，高技术精密锻件、超塑成形零件、高技术工程装备等对高性能金属材料
收稿日期：20171124；修订日期：20180104
基金项目：国家自然科学基金资助项目（51401177）；江苏省高校自然科学研究重大项目（17KJA460010，16KJA430003）；江苏省自然科学基金资助项目（BK2013222）；江苏省青莹工程优秀青年骨干教师计划（苏教师2014-23）；徐州市科学计划项目（KC16SG279，KC16HQ238）；徐州工程季院大学生创新创业基金项目（XCX2017109)
作者简介：张婷（1993-），女，本科 E-mail: 15722868937@ 163. com
通讯作者：何板（1980-），女，博士，副教授万方据ail：heminbox@sohu.com
提出追切需求，需要金属材料表现出有别于传统的优异物理、力学和成形性能，如高磁导率、高强度、高韧性、超塑性等。超细晶（Ultra-FineGrained， UFG）材料的晶粒尺寸为1~100nm（纳米级）及 100nm~1μm（亚微米级）[1]。特别是当高比强度高强韧性成为结构设计的关键因素时，UFG材料所表现出的物理、力学和成形性能对于基础研究和工业应用十分重要。
根据实验研究，真应变至少达到4.0及以上才能够获得微米及亚微米晶粒[2】，材料才能体现出较好的细晶强化效果。20世纪80年代SegelVM等[3] 提出等径角挤压（Equal Channel Angular Pressing， ECAP）方法，相比于气相法、球磨法等传统加工技术，它可以克服其他方法制备试样孔洞、致密性差
模具栏目是由焦杰汉金(沧州)精密模具有限公司EORGEWN /DIUET费助刊出