22MnB5高强板冲压成形热力耦合数值模拟  

Numerical simulation of thermal-mechanical coupling during stamping forming of 22MnB5 high strength plates

作　　者：李俊琛[1,2] 顾自有 胡彦昭 杨大巍[1] 

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2017年第1期15-18,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51365029);甘肃省自然科学基金(1208RJZA285;1208RJZA121)

摘　　要：采用ABAQUS软件建立基于热力耦合的有限元模型,对22MnB5高强板不同工艺条件下的成形过程进行模拟分析,探究摩擦系数、模具间隙和成形温度等工艺参数对热成形时的减薄率和应力分布的影响.结果表明:成形温度的升高会改善材料的塑性,导致变形抗力减小,危险点应力减小,减薄率增大.随模具间隙增加,危险点应力、减薄率都呈减小趋势.摩擦系数的增大导致材料流动阻力增大,减薄率增加,材料容易被拉裂.研究表明,摩擦系数0.1、模具间隙2.2mm、成形温度800℃为合适的工艺参数.The finite element model is constructed with software ABAQUS based on thermal-mechanical coupling in order to study hot stamping process of high-strength plat 22MnB5, and the influence of processing parameters such as friction coefficient, die clearance and forming temperature on the thinning rate and stress distribution of the plate during thermal forming is studied. The result shows that the increase of forming temperature will improve the plasticity of material, reduce the forming stress, increase the stress at the dangerous point, and in crease the thinning rate. With the increase of die clearnace, the stress at dangerous point and thinning rate will exhibit reducing trend. The increase of friction coefficient will lead to the increase of flow resistance of the material and thinning rate of the plate, so that the sheet metal will be easy to racture. It is found by exploying the feature of the hot stamping forming that following processing parameters will be appropriate： friction coefficient is 0. 1, die clearance is 2. 2 mm, and forming tem- perature is 800 ℃.

关 键 词：数值模拟 冲压工艺 高强钢 热冲压 热力耦合 

分 类 号：TG389[金属学及工艺—金属压力加工]