由冲裁变形过程的分析可知，决定合理间隙值的理论依据是应保证在塑性剪切变形结束后，由凸模和凹模刃口处所产生的上、下剪切裂纹重合。
According to the blanking distortion procedure, the theory that decide the proper gap is to make sure the edge of the male die and female die's gap can be superposition.
冲裁件的尺寸精度要取决于凸、凹模的刃口尺寸及公差。
The size accuracy of press tools main ly depends on the cutting edge sizes a nd tolerances of punches and matrixes.
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