印制板在冲裁时,往往会产生下列一些问题。这些问题的产生,将影响到尺寸精度、元件插入、焊接、绝缘性能等。甚至造成板子报废。因此必须认真解决。一、毛刺大原因:1、凹、凸模冲裁间隙小,如图一所示。在这种情况下的剪切属挤压剪切,造成凸模和凹模两侧产生裂纹不重合,断面两端发生两次挤压剪切。 PCB in punching, often have the following problems. These problems will affect the dimensional accuracy, component insertion, welding, insulation and so on. Even caused the board scrapped. It must be seriously resolved. First, a large burr reasons: 1, concave, punching punching gap is small, as shown in Figure one. In this case the shear is extrusion shear, resulting in punch and die on both sides of the cracks do not coincide, the two ends of the cross-section occurred twice squeeze shear.