Packaging steel strip two-way greeted with crack propagation separation mechanism

Packaging steel strip greeted with two-way crack extension separation mechanism & other; Two-way greeted with crack propagation throughout separation &; Mechanism of blanking process, can be divided into the following three stages: the first stage of elastic deformation stage. After blanking, punch contact materials, because of the punch pressing, make the material produces elastic compression and bending, and slightly to squeeze into the concave die hole. The internal stress of the material does not exceed the elastic limit. The second stage of plastic deformation stage. When punch continue to pressure, material internal stress reaches the yield limit, metal is squeezed into the concave die hole, produce plastic deformation. Because that there was a gap between the convex and concave die material producing bend and stretch, so punch continue to pressure, material internal stress is increasing, the convex and concave die blade material library force concentration. When the internal stress exceeds the shear strength of the material, the stress concentration of the material to produce crack. The third stage for tear stage. As punch to continue to pressure, convex and concave die edge in extended to the inside material of material, the material and then be pulled apart. When the clearance value is reasonable, the overlap between upper and lower two cracks. Due to the die plate is still belongs to the blanking clearance, its materials are hardened steel, convex and concave die and blade part and a sharp, so, & other; Two-way greeted with crack propagation throughout separation &; Mechanism adapted to the die plate.