Analysis of various problems in the debugging of metal stamping parts (1)

After assembling the mold for processing metal stamping parts, the quality of the metal stamping parts and the performance of the mold must be comprehensively inspected and tested through test punching. All kinds of problems that appear in the test punching must be comprehensively analyzed to find out the problem. Reasons, and make appropriate adjustments and corrections to the die, so as to finally obtain qualified metal stamping parts; let’s take a look at what are the problems that may arise? 1. Poor section shape. Poor section shape occurs. Generally speaking, the blanking gap between the working parts of the metal stamping die is unreasonable. A reasonable gap means that the burrs and collapse angles are relatively small, and the shear section remains The gap is small in stress; the size of the bright band of the section is one of the important factors to measure the quality of the shear section. The smaller the gap, the larger the bright band, but to a certain extent, secondary shearing surfaces and thin and high burrs will appear. Therefore, when determining the gap, the required shear surface shape, the material to be processed, and the lubrication method should be considered; Second, the secondary shear surface and thin and high burrs around the cause analysis: 1. Punch and The gap between the dies is too small; 2. The method for debugging the cutting edge wear of the punch and the dies: 1. Generally, if the blanking gap is too small, secondary shear is likely to occur during the blanking process, which needs to be increased gap. As for the grinding convex mold or the concave mold, the size of the product needs to be measured and determined according to the dimensional tolerance of the product drawing of the metal stamping part. 2. In the mass production of metal stamping parts, if the cutting edge is worn, the generation of cracks during punching will lag behind. The shape of the shear section is similar to the shape of the shear gap when the shear gap is too small, and the height of the burr also increases at the same time. In mass production, in order to determine the grinding period after the cutting edge is worn, the height of the burr is measured, and if the limit is reached, it needs to be ground again; 3. Analysis of the reasons for the thick and high burrs around: 1. Between the punch and the die The gap between the two is too large; 2. In the stamping production process, the verticality error of the die due to wear becomes larger, and at the same time, the gap between the die and the punch is out of tolerance; debugging methods: 1, mainly to reduce the gap 2, For metal stamping parts with a simple shape and small size, it can be reworked. 3. Anneal the metal stamping part mold to repair the blade, then heat treatment and grinding. 4. When using the insert, use the mold backing plate and wait for the blade to be pressed out. Further processing; article recommendation: debugging of stamping parts and the purpose of debugging Previous: How to improve the utilization rate of automotive stamping parts