How to solve the problem that the punching size of the stamping parts of the hardware automobile does not match?

2019-11-04 09:22:57

Metal stamping industry is an industry which involves a wide range of fields. It goes deep into all aspects of the manufacturing industry. It is a kind of technology that uses punch and mold to deform or fracture iron, aluminum, copper and other materials to reach a certain shape and size.

Metal stamping process can be divided into separation process and forming process. The purpose of forming process is to make the sheet metal plastic deformation without breaking the blank, and to make the required shape and size of the workpiece. The purpose of the separation process is to separate the stamping parts from the sheet along a certain contour line and ensure the quality requirements of the separation section. In actual production, it is often a variety of processes applied to a workpiece. Punching, bending, shearing, drawing, bulging, spinning and straightening are the main stamping processes.

The surface and internal properties of sheet materials for metal automobile stamping have a great influence on the quality of stamping products, which requires that the thickness of stamping materials is accurate and uniform; the surface is smooth without scratch or surface crack; the yield strength is uniform without obvious directionality; the uniform elongation is high; the processing hardness is low.

In the production process of metal stamping parts, we will encounter the situation that the punch size is too large or too small and the difference between punch size and punch size is large. In order to solve this problem, we should not only consider the planning size, processing accuracy and blanking clearance of forming punch and die, but also think about the following aspects.

1. As a result of the rough edge of the punching part during blanking, it is necessary to study the cutting edge and check whether the blanking clearance is reasonable. It is mainly aimed at U-bend and V-bend. The key to solve the problem is to guide the stamping parts before bending, during bending, and to press the material to prevent the stamping parts from sliding during bending.

2. The tensile stress of the material increases, and the tendency of turning over and twisting of the stamping parts increases. When turning over occurs, the punching size tends to be smaller. The strong pressure on the material causes the deformation of the material, which will lead to the increase of the punching size. When the pressure is reduced, the punching size will be smaller.

3. If a bevel or arc is made at the end, the punching size will be larger because the punching force is relieved and the punching parts are easy to turn over and smear. When the end of the punch is flat (no bevel or arc), the punch size will be smaller.