The traditional process of cold extrusion is usually based on experiences,which requires repeatedly testing and repairing dies,and there is a long production cycle and high cost.The process analysis and two different cold heading plans for hexagonal slot nut were described.Numerical simulation for two different plans was proposed based on the finite element analysis software DEFORM-3D. The law of stress and strain, load was analyzed and compared. The result show that the deformation degree distribution is more reasonable, parts surface quality is better and die service life is longer by using the second plan.Application of finite element technology in the technology optimization of hexagonal slot nut has a certain value to the same type of parts forming technology and die design.%传统的冷挤压工艺通常是根据经验反复的试模修模加以确定的,生产周期长,成本高.对六角开槽螺母进行了工艺分析,提出了两种不同的多工位冷镦工艺方案,并基于有限元技术DEFORM-3D分别对两种方案进行数值模拟仿真计算.分析比较了两种方案应力应变、载荷分布的规律.结果表明,采用第2种冷镦工艺方案时,各工位变形程度分配更为合理,模拟得到的零件表面质量更佳,模具使用寿命更长.将有限元技术应用于六角开槽螺母的工艺优化,对同类紧固件的成型工艺及模具设计具有一定的参考价值.
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