What are the characteristics of cover parts compared with traditional stamping parts?

Stamping products are used in all walks of life. Automobile covering parts are a special kind of stamping parts in the stamping products. Compared with traditional stamping parts, automobile covering parts have many characteristics. Let's take a look at it below; compared with general stamping parts In comparison, covering parts have the characteristics of thin materials, complex shapes, large structural dimensions, and high surface quality. Automobile covering parts have complex shapes and large sizes, so it is generally impossible to obtain directly in a stamping process, and some require more than a dozen processes. Yes, at least three processes are required. The stamping processes of the covering parts include blanking, stretching, flanging, and punching. According to the needs, some processes may be combined, such as trimming and punching, trimming and flanging. Etc.; the holes on the covering parts of the stamping parts are processed by drilling methods, and the drawing dies generally use low-melting alloy molds and zinc-based alloy molds; the shape of the covering parts in the stamping parts is complex, the depth is uneven, and asymmetric, and the material is pressed. Due to its small area, it is necessary to use stretch ribs to increase the feed resistance, or use the reasonable arrangement of stretch ribs to improve the flow conditions of the blank in the press ring, so that the metal flow in each section is uniform, and effectively prevents Wrinkles and cracks; the stretching of the cover not only requires a certain stretching force, but also requires sufficient and stable pressing force during the stretching process. Due to the large outline size of the cover, the ordinary single-action press with air cushion Can not meet its requirements for pressing force, stretching requirements of the cover, good plasticity of the material, high surface quality and high dimensional accuracy; when the cover is stretched, in order to reduce the friction between the sheet and the die and the pressing ring, Reduce the internal stress of the material to avoid the phenomenon of cracks and surface roughness; article recommendation: the drawing process of cylindrical stamping parts with flanges Previous: A brief introduction to the bent parts in stamping parts