Causes and solutions for turning and twisting of metal stamping parts

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 affects the quality of the product. (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 edge 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 stamping parts to turn over and twist becomes greater. (6). Unreasonable or uneven blanking clearance is also the cause of turning over and twisting of stamping parts, which needs to be overcome. 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. The reasons and solutions for turning and twisting of metal stamping parts: 1. It is caused by the burrs of stamping parts during stamping. Need to study the cutting edge, and pay attention to check whether the blanking gap is reasonable. 2. Turning, twisting and deformation of the stamping parts have occurred during stamping, resulting in poor forming after bending, which needs to be solved from the blanking and unloading station. 3. It is caused by the instability of stamping parts during bending. Mainly for U-shaped and V-shaped bending. To deal with this problem, guiding the stamping parts before bending, guiding during the bending process, and pressing the material during the bending process to prevent the stamping parts from slipping during bending are the key points to solve the problem. Previous post:Resolution for springback of automotive metal stamping parts, detection features of automotive stamping parts