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采用对开凹模实验装置和测力传感器分别测出在不同模角、摩擦条件下总变薄拉延力、冲头顶推力和分模力,求出变形时工件内外接触表面上的平均摩擦系数,代入主应力法和上限法理论公式表明,拉拔应力的试验值和理论计算值吻合较好。根据试验结果给出模角、工件内外表面上的摩擦系数差对拉拔应力的影响规律,并在合适的工艺参数条件下用单模一次成形出变薄系数达0.2的试件,其变形程度约为目前生产中达到的极限变形程度的2倍以上。本研究为生产上优化工艺参数、提高生产率提供了科学的依据。
The open die test device and the load cell were used to measure the total thinning force, punch thrust and die clamping force under different die angles and friction conditions respectively. The average friction coefficient , Substituting the principal stress method and the upper bound method, the theoretical formula shows that the experimental values of tensile stress are in good agreement with the theoretical values. According to the experimental results, the influence of the die angle and the friction coefficient difference between the inner and outer surfaces of the workpiece on the drawing stress is given. The deformation coefficient of the specimen with the thinning coefficient of 0.2 is formed by a single mold under suitable process parameters About 2 times more than the limit of deformation reached in the current production. This study provides a scientific basis for optimizing process parameters in production and improving productivity.