The solution to the rupture defect of stamping forming

Stamping forming is a very important metal plastic forming method, which is widely used in various fields such as electrical machinery, aerospace, construction, automobiles and locomotives. In the actual stamping production process, some product defects, such as cracks and wrinkles, often appear, which directly affect the surface quality, geometric accuracy and mechanical properties of metal stamping parts. Precision, a manufacturer dedicated to precision metal stamping custom processing and precision drawing custom processing for 12 years. The author will briefly introduce the solutions to the defects of stamping forming fractures. In the final analysis, the rupture of metal stamping parts is caused by excessive local tensile strain of the material. Therefore, the principle of eliminating the rupture phenomenon is to change the distribution of normal contact force and tangential friction to reduce the tensile strain value in the fracture area. 1. Choose a reasonable size and shape of the blank. The size and shape of the blank during the material forming process will affect the forming quality. For example, when drawing a square tube, first use a square blank for stretching. If it breaks, you can adjust the four corners of the blank. Cut corners of appropriate size can eliminate cracks. 2. Improve lubrication conditions. The relationship between the quality of stamping forming and lubricants is extremely important. Poor lubrication conditions or improper selection of lubricants may cause material cracking. 3. Increase the auxiliary process (change the arc or slope of the product, increase the shaping or process cut) Under the premise of meeting the functional requirements of the part, appropriately increasing the mold fillet or reducing the slope can reduce the flow of materials during the molding process Resistance to avoid rupture. Punching process incisions at the appropriate part of the material, so that the easily broken area can be supplemented with material from the adjacent area, so as to improve the deformation of the area, and it can also avoid the occurrence of cracks. 4. Adjust the drawbead parameters or blank holder force. Although the use of drawbeads can prevent wrinkles in the flange part, its side effect is to increase the flow resistance of the material into the die. Therefore, improper drawbead parameters may cause The flow resistance is too large, causing the sheet to crack. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automobile stamping parts molds Learn more: Points to note in the design of continuous stamping dies (2)