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对偏心螺母进行工艺分析,提出了两种不同的工艺方案,并基于Deform-3D对两种冷镦工艺方案进行数值模拟。对比分析了两种方案成形过程中应力应变分布以及载荷行程曲线的变化规律。通过优化工艺及模具结构使得多工位冷镦过程中各工位模具承受的载荷值较小并且分布均匀。经仿真分析以及实验验证证明,通过第2种工艺方案生产出来的偏心螺母表面质量较好,填充饱满,无裂纹、折叠等缺陷,采用该工艺方法更适用于零件的大批量生产。
The process of eccentric nut is analyzed, two different process schemes are proposed, and the two cold heading processes are numerically simulated based on Deform-3D. The stress-strain distribution and the change rule of load-stroke curve in the two schemes are compared and analyzed. By optimizing the process and the structure of the mold, the load values of the molds of various stations in the multi-station cold heading process are small and evenly distributed. The simulation analysis and experimental verification proves that the eccentric nut produced by the second process scheme has better surface quality, full filling, no cracks, folding defects and the like, and the method is more suitable for mass production of parts.