汽车B柱热冲压模具温度场研究

Study on Temperature Field of Hot Stamping Dies for B Pillar of Vehicles

采用有限元仿真技术对汽车B柱热冲压成形的温度场进行分析计算。模拟连续热冲压生产,计算10个成形周期中热冲压模具和板料的温度变化。结果表明,热冲压模具冷却系统切实有效,板料的平均冷却速率可达60℃/s,满足超高强钢马氏体转变条件;在7个成形周期以后,热冲压模具在冷却系统的作用下即可达到热平衡状态,保证了连续生产的顺利进行,该技术指标可为实际生产中工艺参数的制定提供依据。

The hot stamping temperature field for shaping of vehicle B pillars is analyzed and calculated with finite element simulation technique. The temperature change of hot stamping dies and plates are calculated in 10 shaping cycles under simulated continuous hot stamping operation. The result reveals the cooling system for hot stamping dies can work effectively to cool the plates at average cooling rate up to 60 ℃/s, which allows for martensitic transformation of super-high strength steel.After 7 shaping cycles, the hot stamping die can reach thermal balancing condition by the aid of the cooling system to ensure the continuous operation. The technical data provide the basis for determination of actual process parameters.