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以某种螺母冷镦过程中受力较大的下冲棒为例,将有限元数值模拟与正交试验相结合,设计下冲棒圆角半径、下冲棒前角、上冲棒速度、下冲棒初始硬度、摩擦系数的五因素四水平正交试验表,基于Archard磨损理论进行下冲棒磨损正交试验。以下冲棒磨损量最小为优化目标,获得最优组合。结果表明,在浮动反挤压过程中下冲棒前角大小对磨损的影响最大,并可根据最优参数预测下冲棒的使用寿命。
Taking a kind of lower punch which is subjected to a large force during the cold heading of a nut as an example, the finite element numerical simulation is combined with the orthogonal test to design the radius of the lower punch, the angle of the lower punch, the speed of the upper punch, Under the initial punch rod hardness, friction coefficient of the four-level orthogonal test table of five factors, based on Archard wear theory orthogonal test under the punch rod wear. The following minimum amount of punch wear optimization objective, to obtain the optimal combination. The results show that the size of the rake angle of the ram has the greatest influence on the wear during the floating anti-extrusion, and the service life of the ram can be predicted based on the optimal parameters.