Car mold workpiece strain problem

Extension (drawing, stretching), bending, flanging, sheet rolling and other types of molds, the common feature is that the workpiece in the molding process, the mold and the material to be processed contact surface to produce relative sliding. In general, the materials to be processed are mostly various types of steel materials and various types of plated steel sheets, and the molds are generally made of steel. A big problem with this type of working condition is that the surface of the workpiece and the mold is prone to strain during the forming process, which is also called pulling, scratching, or drawing. The consequences of automotive mold strains are the appearance of the product and the quality of the product. In some cases, the surface of the workpiece is strained, which is waste. When the strain is severe, the seizure occurs and normal production cannot be performed. The working pressure of automobile mold forming is relatively large or the tensile phenomenon of austenitic stainless steel materials is particularly serious. For this phenomenon, there is still a lack of systematic research in China, and there is no effective guiding principle for the choice of its solution, while the opposite is true in foreign countries. This paper combines the research and practical experience of the author for many years to analyze this problem and introduce its solution in detail.