模具参数对旋转通道等径角平行挤压工艺的影响

发布时间：2018-01-22 20:23

本文关键词： 旋转通道等径角平行挤压大塑性变形变形均匀性损伤超细晶　出处：《锻压技术》2017年02期 　论文类型：期刊论文

【摘要】：为克服传统等径角挤压反复多道次累积塑性变形带来多次装料、多次加载以及棒料机械加工等耗时问题,无损伤地制备均匀超细晶结构时效硬化型铝合金,提出旋转通道等径角平行挤压大塑性变形新工艺。该工艺在一个通道内设置多个剪切变形区,通过在两个等径角挤压通道之间设置旋转通道来改变圆棒料剪切方向和剪切角度,实现Bc加工路径,提高变形均匀性。采用正交试验法选取内角Φ、外角Ψ、升角γ、椭圆因子m、第2个通道中第1段直通道长度L_1作为因素,采用有限元模拟法对棒料在16组不同水平的模具中进行有限元挤压模拟。以等效应变、等效应力、损伤量以及变形均匀性系数作为指标值分析其对挤压过程的影响。模拟实验结果表明,良好的挤压通道内角Φ的合理范围为90°~120°,外角Ψ的合理范围为30°~40°,升角γ的合理范围为60°~80°,m的合理范围为1.2~1.4,L_1、L_3的合理范围为(1~1.5)d。
[Abstract]:In order to overcome the time-consuming problems such as multiple loading, multiple loading and bar machining caused by repeated multi-pass cumulative plastic deformation of conventional equal-diameter angular extrusion, homogeneous ultra-fine grain structure aging hardening aluminum alloy was prepared without damage. A new process of large plastic deformation for parallel extrusion of rotating channels with equal diameter angle is proposed, in which multiple shear deformation zones are arranged in one channel. By setting a rotating channel between two equal diameter angular extrusion channels to change the shearing direction and shearing angle of circular bar material, the machining path of BC is realized and the deformation uniformity is improved. The orthogonal test method is used to select the inner angle 桅 and the outer angle 蠄. The ascending angle 纬, the elliptic factor m, and the length of the first straight channel in the second channel, L _ 1, were taken as the factors. The finite element simulation method was used to simulate the extrusion of the bar in 16 different levels of die. The equivalent strain and equivalent stress were used. The effect of damage and deformation uniformity coefficient on the extrusion process is analyzed. The simulation results show that the reasonable range of internal angle 桅 is 90 掳/ 120 掳. The reasonable range of external angle 蠄 is 30 掳/ 40 掳, and the reasonable range of rising angle 纬 is 60 掳/ 80 掳/ m. The reasonable range of L3 is 1 / 1 / 2 / d.
【作者单位】：徐州工程学院机电工程学院;
【基金】：国家自然科学基金资助项目(51401177) 江苏省自然科学基金资助项目(BK2013222) 江苏省青蓝工程优秀青年骨干教师计划(苏教师2014-23) 徐州工程学院大学生创新创业基金项目(201526)
【分类号】：TG379
【正文快照】： 随着航天航空技术、交通运输工具和军事机械装备等领域的迅速发展,具有优异综合性能的金属材料受到了与日俱增的关注。制备高比强度与良好塑性相匹配的金属材料,一直是各国材料科学和材料工程领域研究的热点,也是国际材料领域竞争最激烈的研究方向之一[1]。根据目前各国的研究

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