锻压技术

汽车B柱高强度钢热冲压工艺

英文标题：Hot stamping process of high-strength-steel for automotive B-pillar

作者：赵运运李亨李明崔江涛吴玉程

分类号：TH16

出版年,卷(期):页码：2017,42(2):66-71

摘要：

采用数值模拟与试验相结合的方法，研究了汽车B柱22MnB5高强度钢热冲压成形工艺。根据对B柱零件结构的分析，设计模具型面，并合理添加压料板。建立B柱热冲压有限元模型，设置板料加热温度、模具温度、压料板的压力、冲压速度、淬火保压压力等工艺参数，确定工艺参数方案。对B柱热冲压进行全过程数值模拟，得到了热冲压件的厚度、微观组织、硬度等性能分布情况，并与试验结果进行对比。热冲压件性能检测结果表明：零件的厚度分布较均匀，最大减薄率小于25%，平均硬度达到470 HV以上，平均抗拉强度达到1400 MPa以上，显微组织为均匀板条状马氏体。成形后的B柱各项性能均满足热冲压技术规范要求，表明了该B柱热冲压成形工艺的可靠性。

The hot stamping process of high strength steel 22MnB5 for automotive B-pillar was investigated combining with numerical simulation and experiments. According to the analysis of B-pillar structure, the die surface was designed and PAD was added reasonably. Then, a hot forming FE model of automotive B-pillar was established, and the process parameters including blank heating temperature, tool temperature, pad pressure, drawing velocity, holding pressure of quenching, etc. were set in order to confirm the whole process scheme. Therefore, the hot stamping process of B-pillar was numerically simulated, and the distribution of thickness, microstructure, hardness, etc. was obtained and compared with the experimental results respectively. The mechanical property testing of hot formed parts show that the thickness distribution of parts is uniform, the largest thinning ratio is less than 25% and the average hardness is up to 470 HV. Furthermore, the average tensile strength is more than 1400 MPa, and the microstructure is homogenous lath martensite. Thus, the final properties of formed B-pillar satisfy the requirements of hot stamping quality specification, and the hot stamping process of B-pillar is reliable.

基金项目：

合肥工业大学博士学位人员专项科研资助基金（JZ2015HGBZ0136）；高等学校博士学科点专项科研新教师基金（2013JYXJ0653）

赵运运（1991-），女，硕士研究生李亨（1984-），男，博士，讲师

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