摘要
铝合金覆盖件冲压成形遇到的常见质量问题是起皱、破裂和回弹。利用计算机辅助实验(CAT)技术研究工艺参数和板坯形状对某汽车发动机罩外板成形质量的影响,找出满足质量评价指标要求的最优工艺水平组合。结果表明:实验方案中所有工艺水平组合均能很好地控制制件的起皱和破裂;一个板厚的凸凹模间隙有利于改善制件的贴膜性;采用矩形板坯可降低制件局部的最大减薄率和削弱其切边后的回弹;压边力和拉深筋高度对定量评价指标的影响不显著,但适当提高压边力和增加拉深筋高度可在一定程度上减小制件的回弹量。在压边力300 kN、凸凹模间隙0.8 mm、拉深筋高度14 mm、矩形板坯(虚拟)拉深速度3000 mm·s-1条件下,能够获得满足质量评价指标要求的发动机罩外板制件。
The common quality problems are wrinkle, fracture and spring-back in stamping Al-alloy auto-body panels. Based on computer aided test, the effect of technological parameters and blank shapes on forming quality of an Al-alloy hood outer was studied, and a group of optimizing parameter levers to meet the demand of quality evaluation index were determined. The results show that all level combina- tions in the experiment plan can well control wrinkle and fracture when forming the panel. The punch-die gap of one blank thickness is propitious to improve the fit-ability between panel and die. The rectangle blank used in forming may reduce the local maximum thinning when forming panel and the spring-back after trimming. The effect of draw-bead height and blank hold force on quantized evaluation indica- tors is not remarkable, but apropos increasing the blank holder force and the drawbead height will reduce the panel spring-back within a certain degree. The hood outer to meet the demand of quality evaluation index can be produced under the conditions of blank hold force 300 kN, punch-die gap 0. 8 mm, draw-bead height 14 mm, （virtual） drawing speed of rectangle blank 3000 mm ·s-1
出处
《锻压技术》
CAS
CSCD
北大核心
2014年第2期31-36,共6页
Forging & Stamping Technology
基金
四川省教育厅重点项目(11ZA282)
西华大学"流体及动力机械"省部共建教育部重点实验室学术成果培育项目(SBZDPY-11-16)
