锻压技术

汽车前围板模具表面摩擦敏感区域的划分及优化设计

英文标题：Division and optimization design on friction sensitive region for automobile front plate die surface

作者：符永宏胡光耀符昊

单位：江苏大学机械工程学院江苏镇江 212013

分类号：TG316

出版年,卷(期):页码：2019,44(5):121-125

摘要：

开裂是冲压成形件的主要缺陷之一，为了改善板料成形质量，对模具表面摩擦系数进行优化设计。以汽车前围板为例，分析汽车前围板冲压模具的特征结构，对模具表面进行初步的区域划分。利用ABAQUS对汽车前围板的冲压过程进行数值模拟，以板料A和B两处的厚度为优化目标，采用单因素方法，分析模具表面不同区域的摩擦特性对板料成形的影响，确定模具表面摩擦敏感区域。通过均匀设计方法，确定模具表面摩擦系数的最优组合为：μ1=0.02，μ2=0.03，μ4=0.04，μ5=0.06，μa=0.18，μd=0.21，其他区域为0.12，此时板料A和B两处的减薄率最小。结果表明，减小区域1、2、4、5的摩擦，增大区域a、d的摩擦，可以减小厚度减薄程度，从而降低成形件拉裂的几率.

Cracking is one of the main defects of stamping parts. In order to improve the forming quality of sheet metal, the friction coefficient of die surface was optimized. For the automobile front plate, the characteristic of die structure was analyzed, the die surface was divided into several parts, and the stamping process of automobile front plate was simulated by ABAQUS software. Taking the thickness in the A and B positions of sheet metal as the optimization objective, the influences of friction characteristics of different regions of die surface on sheet metal forming were analyzed by single factor method, and the friction sensitive region of die surface was determined. Then, through the uniform design method, the optimal combination of friction coefficient of die surface is determined as μ1=0.02,μ2=0.03, μ4=0.04, μ5=0.06，μa=0.18, μd=0.21, the friction coefficients of other die surfaces are 0.12, and the minimum reduction rates in the A and B positions of sheet metal are the smallest. Reducing the friction in the regions 1, 2, 4, 5 and increasing the friction in the regions a, d can reduce the thickness reduction and the probability of forming parts to crack.

基金项目：

江苏省重点研发计划项目（BE2016144）

作者简介：符永宏（1965-），男，博士，教授 Email：〖WTBZ〗brillo@foxmail.com

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