拉深成形中变形减轻孔的研究与应用

拉深是冲压成形中最基本的成形工序之一，对于拉深系数小于极限拉深系数的工件来说，为防止变形拉裂通常需要多次拉深成形工序，在每次拉深成形后，为消除冷作硬化给后续成彤工序带来的不利影响，两次拉深成形之间，还需要增加一些辅助工序，这样一来，拉深次数越多，所需要的模具副数越多，拉深成形的后续工序也越多，不仅使生产效率降低，而且提高了生产成本，使经济效益下降。对于底部有孔的深拉深件，根据金属成形的强弱区理论及变形趋势的控制方法，在理论分析的基础上，针对生产实际中的零件，进行了一些模拟实验，较好地解决了需要多次拉深的问题。

Research and Application of Reduce the Hole in Drawing

The drawing is one of most basic formed working procedures in ramming forming.In order to prevent the distortion tension fracture usual need multiple drawing forming working procedure for work piece that smaller than regarding the drawing coefficient the limit drawing coefficient,After each time drawing forming,In order to eliminate the hammer-harden the adverse effect which brings for the following formed working procedure,Between two drawing formings,but also needs to increase some auxiliary working procedures.Therefore,the drawing number of times are more,needs the mold vice-number are more,the drawing forming's subsequent handling are also more,Not only causes the production efficiency to reduce,moreover enhanced the production cost,causes the economic efficiency to drop.If deep drawing has the hole in the base,Treats separately according to metal forming's strong and the weak concerns the distortion tendency the control method,In theoretical analysis foundation,In view of production actual components,We have carried on some modelling to rsolved well the question which needed the multiple drawing.