基于热加工图和NURBS曲线的伺服热冲压工艺设计  

Servo hot stamping process design based on hot working maps and NURBS curves

作　　者：宋燕利[1,2,3] 曹威圣 谢光驹 路珏[1,2,3] 刘鹏 SONG Yan-li;CAO Wei-sheng;XIE Guang-ju;LU Jue;LIU Peng(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan 430070,China;Hubei Research Center for New Energy&Intelligent Connected Vehicle,Wuhan University of Technology,Wuhan 430070,China;Dongshi(Wuhan)Industry Co.,Ltd.,Wuhan 430070,China)

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070 [2]武汉理工大学汽车零部件技术湖北省协同创新中心,湖北武汉430070 [3]武汉理工大学湖北省新能源与智能网联车工程技术研究中心,湖北武汉430070 [4]东实(武汉)实业有限公司,湖北武汉430070

出　　处：《塑性工程学报》2023年第9期50-62,共13页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51975440;51675392);新能源汽车科学与关键技术学科创新引智基地(B17034);教育部创新团队发展计划项目(IRT_17R83)。

摘　　要：考虑热冲压成形过程中工艺流程和材料变形行为的复杂性以及温度分布的时变性,提出一种基于热加工图和NURBS曲线的伺服热冲压工艺设计。以常用B1500HS热成形试样为研究对象,通过高温拉伸实验测得了不同热变形参数下B1500HS硼钢的真应力-真应变曲线,基于DMM原理构建了不同应变量下的B1500HS硼钢热加工图,计算了该材料在伺服热冲压过程中成形阶段最优速度和温度区间。根据典型热冲压模式的各阶段工艺特征和NURBS曲线数学模型,规划和建立了符合各约束条件的伺服热冲压工艺曲线,实现了对伺服热冲压工艺曲线的设计。借助CAE分析软件,开展了汽车中立柱伺服热冲压对比仿真实验。综合分析表明,与常规热冲压工艺相比,采用所提出的伺服热冲压工艺曲线模型成形时中立柱样件应力和温度分布更均匀,最大减薄率降低约8.5%,最大起皱度为4.002×10-3,主应变降低约12.5%,表明所提出的伺服热冲压工艺对危险位置破裂趋势有明显的抑制作用。Considering the complexity of process flow and material deformation behavior in hot stamping process and the time-varying of temperature distribution,a servo hot stamping process design based on hot working maps and NURBS curves was proposed.Taking the common B1500HS hot forming sample as the research object,the true stress-true strain curves of B1500HS boron steel with different hot deformation parameters were measured by high temperature tensile experiments.Based on the DMM principle,the hot working maps of B1500HS boron steel with different strains were constructed,and the optimal speed and temperature range in the forming stage of the material in the servo hot stamping process were calculated.According to the process characteristics of each stage of the typical hot stamping mode and the mathematical model of NURBS curves,the servo hot stamping process curve that meets the constraints was planned and established,and the servo hot stamping process curve was designed.The contrast simulation the experiment of servo hot stamping for auto-mobile middle pillar was carried out by CAE analysis software.The comprehensive analysis shows that,compared with the conventional hot stamping process,the stress and temperature distribution of the middle pillar specimen formed by the proposed servo hot stamping process curve model is more uniform,the maximum thinning rate is reduced by about 7.3%,the maximum wrinkle degree is 4.002×10-3,and the principal strain is reduced by about 12.5%,which indicates that the proposed servo hot stamping process has significant inhibition effect on the fracture trend at dangerous locations.

关 键 词：工艺曲线设计 伺服热冲压 DMM热加工图 NURBS数学模型 

分 类 号：U461[机械工程—车辆工程]