锻压技术

B柱热冲压数值分析研究

英文标题：Numerical analysis of B pillar hot stamping

作者：张志强

单位：武汉钢铁（集团）公司研究院华中科技大学材料科学与工程学院吉林大学材料科学与工程学院

分类号：TH16

出版年,卷(期):页码：2010,35(3):57-60

摘要：

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 is a new technology for forming ultra high strength steel sheet. The temperature distribution of the blank during the process is very important for designing the tools with necessary cooling capability. The hot stamping FE model of the B pillar was built. Through the thermo-mechanical coupling analysis, the temperature and thickness distribution of the blank was obtained. The forces of hot stamping and cold stamping were compared. The results show that the temperature in the holding area of the blank decreases quickly. It will not affect the formability of blank because the temperature in this area is above 600 ℃. The higher temperature area lies in the tail round corner. Because of high temperature, local flow and thinning will happen in this area. Therefore, fast cooling in the high temperature is needed for high quality part. The force of hot stamping is about one tenth of that of cold stamping.

基金项目：

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