BR1500HS高强钢热冲切件断面质量分析及试验研究

发布时间：2018-06-09 02:27

本文选题：BR1500HS + 高强钢　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：BR1500HS高强钢热冲压件,以独特的优点,在实现汽车车身轻量化的同时又能够保证高强度的要求,故广泛应用于各种车身构件中。但是,热冲压件后续需进行冲孔、切边处理,可激光切割效率低、成本高,传统冷冲切容易引起模具崩刃,严重影响模具的使用寿命。因此,通过BR1500HS高强钢热冲切工艺研究,获得不同冲切约束条件下,不同冲切工艺参数对高强钢热冲切件断面质量的影响规律,对热冲压、冲孔、切边一体化工艺的应用具有重要意义。基于高强钢热冲切变形过程的分析,研究了冲切变形各个阶段的特点,分析了各工艺参数对热冲切件断面质量的影响,确定以Oyane韧性断裂准则作为高强钢热冲切数值模拟的断裂模型,并通过混合法建立了Oyane韧性断裂准则的参数方程。采用仿真软件Abaqus,建立了BR1500HS高强钢热冲切件的数值仿真模型,研究了在不同冲切约束条件下,不同冲切工艺参数对断面质量的影响规律,并通过对比,分析了冲切约束条件对热冲切件断面质量的影响。结果表明:随着冲切工艺参数的改变,热冲孔与热切边断面各特征区占比变化趋势基本相同,但热冲孔与热切边断面质量存在明显差异,对冲切工艺参数变化的敏感程度也不相同。通过BR1500HS高强钢热冲切试验,获得了不同冲切约束条件下,不同冲切工艺参数对热冲切件断面质量的影响规律,并对数值模拟结果进行验证,二者之间符合程度较好。通过对试验与仿真结果的分析,以断面毛刺占比不超过板厚的10%、光亮带占比不低于板厚的50%为标准,确定了热冲切件的合理冲切间隙和冲切初始温度。
[Abstract]:BR1500HS high-strength steel hot stamping parts are widely used in various body parts because of their unique advantages, which can not only realize the lightweight of automobile body but also guarantee the requirement of high strength at the same time. However, the hot stamping parts need to be punched and trimmed, the laser cutting efficiency is low and the cost is high. The traditional cold blanking is easy to cause die breakage, which seriously affects the service life of the die. Therefore, through the research of BR1500HS high strength steel hot punching process, the influence of different punching process parameters on the cross section quality of hot punching cutting parts of high strength steel under different punching constraints is obtained. The application of integrated edge cutting process is of great significance. Based on the analysis of hot punching deformation process of high strength steel, the characteristics of each stage of blanking deformation are studied, and the influence of each technological parameter on the cross section quality of hot blanking parts is analyzed. The Oyane ductile fracture criterion is used as the fracture model for the numerical simulation of hot punching shear of high strength steel, and the parameter equation of the Oyane ductile fracture criterion is established by mixing method. The numerical simulation model of BR1500HS high strength steel hot punching cutting parts is established by using the simulation software Abaqus. the influence of different punching process parameters on section quality under different punching constraints is studied, and the results are compared. The influence of blanking constraints on the cross section quality of hot blanking parts is analyzed. The results show that with the change of punching process parameters, the change trend of the ratio of hot punching hole and hot edge section is basically the same, but the quality of hot punching hole and hot edge section is obviously different. The sensitivity of the change of cutting parameters is also different. Through the hot punching test of BR1500HS high strength steel, the influence of different punching process parameters on the cross section quality of hot blanking parts under different punching constraints is obtained, and the numerical simulation results are verified, and the coincidence between them is good. Based on the analysis of the test and simulation results, the reasonable blanking clearance and the initial blanking temperature of hot punching parts are determined by the standard of 10 burr ratio of section burr less than the thickness of the plate and 50% of the bright zone.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG142.1;TG306

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