来源：http://www.jnhjgs.cn 发布时间：2021-04-07 15:27:22 点击：
Mold is a very important part of the manufacturing industry, the following brings you the Shandong mold processing skills. From the waste situation, we can see that the waste is actually the reverse image of the forming hole. That is, the same part with opposite position. After inspection, you can judge whether the gap between the upper and lower die is correct. If the gap is too large, the scrap will show rough, undulating fracture surface and a narrow bright zone area.
The larger the gap, the greater the angle between the fracture surface and the bright zone. If the gap is too small, the scrap will show a small angle fracture surface and a wide bright zone area. Too large gap forms a hole with large curl and edge tear, which makes a thin edge protrude slightly. Too small gaps result in slight curling and large angle tearing, resulting in the profile being more or less perpendicular to the surface of the data.
An ideal waste material should have reasonable collapse angle and average bright band. In this way, the punching force can be kept small and a clean round hole with few burrs can be formed. From this point of view, increasing the gap to extend the life of the die is at the expense of the quality of the waste hole. The choice of the die gap is related to the type and thickness of the stamping data.
Unreasonable gap can cause the following problems: if the gap is too large, the burr of the stamping workpiece is relatively large, and the stamping quality is poor. If the gap is too small, the quality of punching is better, but the wear of the die is more serious, which greatly reduces the service life of the die, and it is easy to break the punch. If the gap is too large or too small, it is easy to produce adhesion on the punch data, so as to form the strip during stamping. Too small gap is easy to form a vacuum between the bottom of the punch and the sheet metal.