How to suppress the turning and distortion of the stamping parts in the progressive die

Stamping is one of the most important processes in processing and production. The quality of the products made by the stamping factory will lay the foundation for the overall appearance and performance. With the refinement of industrial electronics, various industries have higher and higher requirements for metal stamping parts, including the shape of stamping parts. In the process of punching its shape, it is easy to produce material turning and distortion, which seriously affects the product quality. How to solve this phenomenon? First of all, we must be clear about the reasons for the turning and distortion, in order to find a feasible and effective solution. The metal stamping parts are formed in the progressive die by punching the remaining material around the stamping parts to form the shape of the stamping parts. The main reason for the turning and distortion of stamping parts is the influence of punching force. During punching, due to the existence of the punching gap, the material is stretched on one side of the die (the material is warped upward) and compressed on the side of the male die. When using the unloading plate, use the unloading plate to compress the material to prevent the material on the die side from warping upwards. At this time, the force of the material changes accordingly. As the discharge plate increases its pressing force, the material on the punch side is stretched (compression force tends to decrease), while the material on the concave die surface is compressed (tension force tends to decrease). The overturning of the stamping part is caused by the stretching of the material on the die surface. Therefore, when punching, pressing and compressing the material is the key point to prevent the punching from turning over and twisting. In order to suppress the turning and distortion of stamping parts, the following points must be paid attention to: 1. Reasonable mold design. In the progressive die, the arrangement of the blanking sequence may affect the forming accuracy of the stamping parts. For the blanking of small parts of stamping parts, generally a larger area of u200bu200bpunching is arranged first, and then a smaller area of u200bu200bpunching is arranged to reduce the impact of the punching force on the forming of the stamping part. 2. Hold down the material. Overcome the traditional mold design structure, open a material-containing gap on the discharge plate (that is, when the mold is closed, the discharge plate is attached to the concave mold, and the gap between the discharge plate and the concave mold where the material is contained is the material thickness t-0.03 ~0.05mm). In this way, the unloading plate moves smoothly during stamping, and the material can be compressed. The key forming part, the unloading plate must be made into a block-type structure to facilitate the solution of the wear (compression) loss of the pressing part of the unloading plate caused by long-term stamping, and the material cannot be compressed. 3. Add strong pressure function. That is to increase the size of the press part of the unloading insert (normal unloading insert thickness H+0.03mm) to increase the pressure on the material on the side of the die, so as to prevent the stamping part from turning over and twisting during punching. 4. The end of the punch blade is trimmed with a bevel or arc. This is an effective way to reduce cushioning power. By reducing the buffer cutting force, the tensile force on the side material of the die can be reduced, so as to achieve the effect of suppressing the turning and twisting of the stamping parts. 5. In daily mold production, care should be taken to maintain the sharpness of punching convex and concave die cutting edges. When the punching edge is worn, the tensile stress on the material will increase, and the tendency of the stamping part to turn over and twist becomes greater. 6. Unreasonable or uneven blanking gap is also the cause of turning over and distortion of stamping parts, which needs to be overcome. Recommended article: Talking about the causes and solutions of wrinkles in the drawing process of metal stamping parts Previous: Introduction to the drawing process of stamping parts