In order to solve the problem existing in the process of punched hole and punched chink, existing in part coaxial assured,the die is used the sleeve in convex die.The die of life has risen greatly.

• 该模具结构上采用凸模护套技术,克服了薄板冲孔、冲缝的凸模细长易断及孔的同轴度难以保证的困难,使模具使用寿命大大增强。