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Hardware stamping is the first of the four main processes, and its importance can be imagined. The quality of the finished products from Shenzhen Hardware Stamping Factory will lay a solid foundation for the appearance and performance of the entire vehicle. Therefore, the quality assurance of stamping parts has always been a highly valued issue for automotive manufacturing enterprises. Based on the practical experience of quality management in stamping factories in China, the editor summarized common causes and countermeasures in the production process of metal stamping parts, hoping to provide some useful references for improving the quality of stamping parts.
Why does metal stamping parts exhibit steering distortion?
In progressive dies, metal stamping components form the shape of the punch by stamping the residual material around the stamping component. Stamping materials produce turning materials The main reason for distortion is the impact of impact pressure. During stamping, due to the presence of stamping gaps, the material is stretched (warped upwards) on one side of the mold and compressed on the punch side. When using the unloading plate, the material is squeezed by the unloading plate to prevent the material on the side of the mold from warping upwards. At this point, the stress state of the material changes accordingly. As the material increases through the discharge plate, the material on the punch side is stretched (the compressive force tends to decrease), and the material on the mold surface is compressed (the tensile force tends to decrease). The reversal of stamping is due to the stretching of the material on the mold surface. Therefore, when stamping, pressing and pressing the material is the key to preventing the punch from flipping. Reasons and countermeasures for bending and stamping during the bending process. 1. Caused by burrs generated by stamping. It is necessary to study the cutting-edge and pay attention to checking whether the punching gap is reasonable. During the punching process, stamping of stamping components was generated Distortion, resulting in poor forming after bending, needs to be addressed from the punching and unloading stations. Due to three bends, the stamped part is unstable. Mainly used for U-shaped and V-shaped bending. The handling of this issue is focused on bending the guide before impact during the bending process, which leads to material compression during the bending process to prevent the stamping components from sliding during the bending process.
Why can metal stamping components cause tearing? The stamping process for the middle panel bracket of metal stamping parts with common tearing and skewed shapes is: punching, punching, cutting, flanging, forming, cutting, and flanging. During the formation of the intermediate support, there are various forms of tearing and tilting. Due to stamping and production, the torn part is mainly distributed at the intersection of the hole shape, R-arc, and wall neck at the corner of the sidewall of the component. The differences in process conditions vary in the proportion of each fracture site. Tear can be a one-time tear, or it can be caused by fatigue cracks, i.e. the formation of invisible cracks. Based on the actual situation on site, the cause was analyzed and the tearing of the workpiece was determined to be, by examining the fracture shape and degree of fragmentation of the workpiece. Skew behavior is mainly reflected in the formation process of flipping. The reasons for this process are as follows:
1. The molding process parameters are not in place. In the process of forming parts, the mold, pressure core, and two parts must be tightly connected, and when the machine slider slides downwards, the plastic deformation of the paper is forced. Forming.
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