基于性能梯度分布的B柱加强件热冲压模具冷却系统研究  

Research on Cooling System of Hot Stamping Die for B-Pillar Reinforcement Part Based on Performance Gradient Distribution

作　　者：刘雪飞 李磊[2] 石娟昌 王梦寒[2] LIU Xuefei;LI Lei;SHI Juanchang;WANG Menghan(Chongqing Jiangdong Machinery Co.,Ltd.,Chongqing 404100,China;College of Material Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆江东机械有限责任公司,重庆404100 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《热加工工艺》2020年第21期89-95,98,共8页Hot Working Technology

摘　　要：合理的冷却系统方案是分区冷却热冲压模具设计的关键和难点。为了获得最优的冷却系统方案,设计了缩小B柱加强件的三种热冲压冷却系统:预埋弯管随形冷却、配流板-钻孔冷却、钻孔随形冷却。基于Deform软件建立了相变-温度-硬度多物理场耦合模型,分析了保压淬火过程模具的冷却效果。通过对比分析保压淬火完成后零件的组织分布及模具温度变化,得出采用钻孔随形冷却效果最好。最后,基于最优冷却系统方案,以保压时间、保压力为设计变量进行单因素分析,讨论了保压时间、保压力对零件性能的影响规律。结果表明,兼顾生产效率及设备要求,合理的保压时间为10 s,保压力为10 MPa。Reasonable cooling system scheme is the key and difficult point in the design of zonal cooling hot stamping die. In order to obtain the optimal cooling system scheme, three kinds of hot stamping cooling systems(pre-buried curved pipe shape cooling, flow distribution plate-drilling hole cooling and drilling shape cooling)of the reduced scale B-pillar reinforced panel were designed. Based on Deform software, a multi-physical field coupling model of phase transition,temperature and hardness was established, and the cooling effect of dies in pressure holding quenching process was analyzed.By comparing and analyzing the microstructure distribution and die temperature change of the parts after pressure holding quenching, it was concluded that the cooling effect of drilling hole shape was the best. Finally, based on the optimal cooling system scheme, taking the pressure holding time and pressure as the design variables, the single factor analysis was carried out, and the influence rule of the pressure maintaining time and the maintaining pressure on the performance of the part was discussed. The results show that taking into account the production efficiency and equipment requirements, the reasonable pressure holding time is 10 s and the holding pressure is 10 MPa.

关 键 词：变强度 热冲压 冷却系统 相变 

分 类 号：TG385.2[金属学及工艺—金属压力加工]