管状尖角台阶件局部加载过程分析及体积置换减压成形工艺  

Analysis of local loading process of tubular stepped part with sharp corner and volume replacement lower stress forming process

作　　者：胡福泰[1,2] HU Fu-tai(School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;Hebei Innovation Center for Equipment Lightweight Design and Manufacturing,Qinhuangdao 066004,China)

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]河北省轻量化装备设计制造创新中心,河北秦皇岛066004

出　　处：《塑性工程学报》2022年第7期26-32,共7页Journal of Plasticity Engineering

基　　金：河北省自然科学基金资助项目(E2017203127);燕山大学博士基金资助项目(8190004)。

摘　　要：针对管状台阶零件挤压成形工艺的关键问题,对铝合金管状尖角台阶件挤压成形机理进行了全面分析研究,模拟分析了管状尖角台阶件的局部加载精密挤压成形过程。结果表明,三角形台阶顶点两侧材料流动时具有向相反方向翻转的特性。明确了变形不协调和应力集中作用是造成角部开裂的主要原因,最终导致台阶高度难以增长。提出了体积置换法,消除了侧壁成形时的翻转效应,大幅度降低了台阶部位的成形压应力,提高了模具使用寿命,为管状尖角零件的局部大深度台阶挤压成形提供了可行途径。Aiming at the key problems of extrusion forming process of tubular stepped parts, the comprehensive analysis and study of the extrusion forming mechanism of aluminum alloy tubular stepped part with sharp corner were carried out, and the local loading precision extrusion forming process of tubular stepped parts with sharp corner was simulated and analyzed. The results show that the deformation material on two sides of the vertex of the triangular step has the characteristic of turning over in opposite direction. The uncordinated deformation and stress concentration are the main reasons for the cracking of corners, which eventually lead to the difficulty of increasing the height of the step. The volume replacement method was proposed to eliminate the turning over effect during side wall forming, the forming compressive stress around the step and prolong the service life of die, which provides a feasible way for extrusion forming of tubular sharp corner parts with large depth steps.

关 键 词：精密挤压 管状零件 局部加载 体积置换 数值模拟 

分 类 号：TG386[金属学及工艺—金属压力加工]