Limitations of stamping

Generally, sheet metal stamping of metal stamping parts can only form parts with equal wall thickness, and thick bottom and thin-wall parts can be obtained at most by the method of thinning and stretching. The limitations of stamping forming limit its application range. In the production of auto parts, some thin-walled but unequal-thickness parts are often encountered. It is very easy to form them by a composite plastic forming method that combines stamping and cold forging. Therefore, it is easy to use a combination of stamping and cold forging. The method can expand the range of sheet metal processing. The method is to pre-form with a stamping method first, and then finally form with a cold forging method. The advantages of stamping and cold forging compound plastic forming are: First, the raw materials are easy to purchase at a low price, which can reduce production costs; second, the large forming force required for a single cold forging is reduced, which is beneficial to improve the life of the die.　　 Dongguan hardware stamping parts For the mold industry, due to the miniaturization of stamping parts and the continuous improvement of precision requirements, higher requirements are placed on mold technology. The reason is that the forming of micro parts is much more difficult than traditional parts. The reasons are: 1. The smaller the part, the rapid increase in the surface area to volume ratio; 2. The adhesion between the workpiece and the tool, surface tension, etc., increase significantly; 3. , The grain size has a significant influence, and it is no longer an isotropic uniform continuum; 4. It is relatively difficult to store lubricant on the surface of the workpiece. An important aspect of micro-punching is punching small holes. For example, there are many small holes that need to be punched in micro-machines and micro-instruments. Therefore, the study of small hole punching should be an extremely important issue in micro punching. The research on punching small holes focuses on: one is how to reduce the size of the punch; the other is how to increase the strength and rigidity of the tiny punch (in addition to the materials and processing technology involved in this aspect, the most commonly used is to increase the size of the punch Guiding and protection of punches, etc.). Although there are still many issues that need to be studied in punching small holes, many gratifying results have been achieved. Some data indicate that the micro-stamping machine tool developed abroad is 111mm long, 62mm wide and 170mm high. It is equipped with an AC servo motor and can generate 3kN pressure. The press machine is equipped with a continuous stamping die, which can realize punching and bending. Previous: Introduction to the stamping process