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首次拟定了等应变模变薄拉延时的运动学容许速度场。根据上限原理,研究了等应变模变薄拉延时各变形工艺参数对冲头单位压力的作用。同时,结合最小能量原理,优化了重要工艺参数—凹模型线高度(H_(opt))值。研究结果表明:变薄系数、加工硬化效应、变形体与凹模间的摩擦是决定冲头单位压力的主要因素;变薄系数、变形体与凹模间的摩擦和工件外形尺寸R_e值是确定H_(opt)值的决定性因素。黄铜H62和H68的实验结果表明:理论分析与实验结果比较一致。
For the first time, the kinematic allowable velocity field for constant strain mode thinning is formulated. According to the principle of upper limit, the effect of process parameter of each deformation on the unit pressure of punch was studied. At the same time, combined with the principle of least energy, the important process parameters - the height of the concave mold (H_ (opt)) are optimized. The results show that: the thinning coefficient, work hardening effect, the friction between the deformable body and the die are the main factors that determine the unit pressure of the punch; the thinning coefficient, the friction between the deformable body and the die and the dimension R_e of the workpiece are determined H_ (opt) the decisive factor in the value. The experimental results of brass H62 and H68 show that the theoretical analysis is in good agreement with the experimental results.