间接热成形中预成形量对零件成形质量的影响

Influence of pre-forming amount on forming quality of parts in indirect hot forming

为了更好地掌握间接热成形技术,以22MnB5钢材料为例,结合数值模拟与试验两种手段对盒形零件的间接热成形工艺进行研究。讨论间接热成形中,预成形量对零件成形质量的影响以及预成形量的设计原则。结果表明:间接热成形中,当以冲压行程作为预成形量设计的参考对象时,盒形零件满足随着预成形量的增大,最大减薄率逐渐减小的规律,并且预成形量≥90%时零件的成形性更好,厚度分布更加均匀。对于间接热成形来说,终成形作用更多的是对预成形板料进行整形以及局部特征的成形。此外,不同预成形量不会对零件的力学性能产生很大影响。

In order to better grasp the indirect hot forming technology,for 22MnB5 steel material,the indirect hot forming process of boxshaped parts was studied by combining two methods of numerical simulation and experiment,and the influence of pre-forming amount on the forming quality of parts and the design principles of pre-forming amount were discussed.The results show that in indirect hot forming,when the stamping stroke is used as the designed reference object of the pre-forming amount,the box-shaped parts satisfy the law that the maximum thinning rate gradually decreases with the increasing of the pre-forming amount,and when the pre-forming amount is≥90%,the part formability is better and the thickness distribution is more uniform.For the indirect hot forming,the role of the final forming is more about shaping and forming local features of pre-formed sheet.In addition,different pre-forming amounts do not have a significant effect on the mechanical properties of part.