The machlnes are used for punching shear the cold crimped engine bed with the thickness of 0.5mm- 6mm, the width of 600mm-2000mm, Material strength of 450N/mm2, type:6.3T,16T,25T,63T,125T,the specifications of punching shear are su~eyed by the bit of TB5-20 mesh grid plate:if the TB TL are changed the punching shear knife is also changed;TB,TL are increased,the punching shear strength is reduced: ...