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热冲压技术是一项加工超高强度钢板的新型加工技术。热冲压过程中板料的温度分布情况是热冲压模具冷却系统设计的重要依据。本文建立了B柱的热冲压模型,采用热力耦合数值分析的方法得到了热冲压过程中板料的温度与厚度分布,并比较了热冲压与冷冲压的力能参数。结果表明,板料压边区域温度下降较快,直到成形结束,其温度高于600℃,不会导致该处材料成形困难;零件尾部圆角处温度过高,使板料产生局部流动,导致减薄过大,因此对于局部温度过高的区域要加速模具的冷却,以获得合格的制件。热冲压的力能参数约为冷冲压的十分之一左右。
Hot stamping technology is a new type of processing technology for ultra-high strength steel. Hot stamping process of sheet metal temperature distribution is hot stamping die cooling system design an important basis. In this paper, the hot stamping model of B-column was established. The temperature and thickness distribution of the sheet during hot stamping were obtained by the method of thermo-mechanical coupling numerical analysis. The parameters of hot stamping and cold stamping were also compared. The results show that the temperature in the blank holder area decreases rapidly until the forming temperature is higher than 600 ℃, which will not result in material forming difficulty. The temperature at the fillet of the tail part is too high, which causes local flow of the sheet material, Thinning is too large, so for the local temperature is too high to speed up the mold area cooling, in order to obtain qualified parts. Hot stamping force energy parameters is about one-tenth of the cold stamping.