摘要
为了解决高强度钢板热冲压成形过程中圆角破裂的缺陷问题,进而提高零件的成形质量,采用响应曲面法和数值模拟相结合的方法,对汽车加强件热冲压成形进行模拟,分析高强度钢板加强件圆角产生破裂的原因,并以热冲压件圆角区域的厚度减薄率为优化目标,成形极限图为约束条件,建立目标与板料温度、摩擦因数、压边力之间的二阶函数模型,根据建立的模型确定最佳工艺参数组合。研究结果表明:零件圆角处发生破裂的主要原因是成形过程中圆角处的温度变化及受力状态。最佳工艺参数组合为:初始成形温度850℃,摩擦因数0.12,压边力23.74 MPa。以数值模拟和生产试验验证了优化结果的准确性,得到成形质量比较好的热冲压件。
In order to solve the fillet cracking of high strength steel plate in hot stamping, and then improve the quality of forming parts, the method combining response surface methodology and numerical simulation was employed. Auto reinforcement was studied to analysis reasons for fillet cracking. And the optimal quadratic function model of goals and blank temperature, friction coefficient, blank-holder forces was established with the least fillet thickness as the object, the process parameters as the variables and the constraints as the FLD. Finally the process parameters were optimized. The results show that the main reasons for fillet cracking is temperature and stress state of round corner area. The optimum process parameters are blank temperature 850 ℃, friction coefficient 0.12, and the blank-holder forces 23.74 MPa. The numerical simulation and the pressing test are carried out to verify the optimization result and the best part is gained.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第12期4161-4167,共7页
Journal of Central South University:Science and Technology
基金
中央高校基本科研业务费资助项目(CDJZR11130003)~~
关键词
响应面法
高强度钢板
热冲压成形
圆角破裂
数值模拟
response surface methodology
high strength steel sheet
hot stamping
fillet cracking
numerical simulation
