sheet metal plate in the bending on both sides of the extrusion due to the association of metal material bulge, resulting in the total width being larger than the original specification, the bulge size should be related to the material thickness, the thicker the bulge is larger, can be in advance in the bending line feeding, so that the bulge area of the material is larger than the original specification, the bulge size and should be related to the material thickness, the thicker the material is larger, can be solved in the same way.

