The depth of the upper die into the lower die when metal stamping-hardware

The depth of the upper die into the lower die is too large during metal stamping. When stamping, the depth of the upper die into the lower die should not be too large. Generally, it is better to just punch the sheet material. The depth can be 0.5-1mm. If the upper mold enters the lower mold too deeply, the wear of the upper mold and the lower mold will be aggravated. In the case of poor mold guiding and punching accuracy, the cutting edge of the mold will be damaged, especially for punching thick materials and punching small holes. In high-speed stamping, the depth of the punching upper die into the lower die cannot be too large. In order to prevent the upper mold from entering the lower mold too deeply, a limit sleeve can be installed on both sides of the upper mold to limit the depth of the upper mold entering the lower mold. When grinding the upper mold, the limit sleeve is also ground to the same amount of grinding. 2. There is an eccentricity between the pressure center of the metal stamping parts and the pressure center of the punch. The point of action of the resultant force of the punching force is called the punching pressure center. If the punching pressure center and the punching pressure center (usually located on the axis of the die shank hole) are not on the same axis, the punch slider will bear an eccentric load, which will cause abnormal wear of the slider guide rail and die guide part, and damage the movement accuracy of the punch , Reduce the life of the mold, and even damage the mold. Therefore, determining the stamping pressure center is an important task of mold design. For workpieces with simple and symmetrical shapes, the resultant stamping force is at its geometric center, and the pressure center does not need to be calculated. For workpieces with complex shapes and multi-process continuous stamping dies, the method of finding the combined force point of the parallel force system should be used to determine the stamping pressure center. 3. The force of metal stamping parts exceeds the nominal pressure of the punching press. The selection of the punching press is mainly based on the punching force. The principle is that the punching force cannot exceed the nominal pressure of the punch. The main factors affecting the punching force are the material thickness and mechanical properties, the peripheral length of the stamping part, the size of the die gap and the sharpness of the cutting edge. When stamping high-strength materials or workpieces with large thicknesses and large contours (such as thick plate stamping), the required punching force is often close to or exceeds the nominal pressure of the punching machine, and when the number of punching machines available in the factory is limited, this is the case. It is necessary to consider trying to reduce the punching force from the mold structure. The main methods to reduce the punching force are: oblique edge stamping method, step upper die stamping method, part step stamping method, heating stamping method, etc. If you need to know more about the production cycle of metal stamping parts, welcome to consult: