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Industry knowledge
Solutions to various process problems in the processing of metal stamping parts
12-15 / 2023

Most of the steel products are made by stamping, which can produce workpieces with reinforcing ribs, ribs, undulations or flanges that are difficult to manufacture by other methods to improve their rigidity. Moreover, compared with castings and forgings, stamped parts have the characteristics of being thin, uniform, light, and strong. The workpiece accuracy can reach the micrometer level, and the repetition accuracy is high. The specifications are consistent, and can be stamped out with holes, protrusions, etc.

Hardware stamping parts are formed and processed by applying external forces on plates, strips, pipes, and profiles using a press and mold, resulting in plastic deformation or separation to obtain the desired shape and size of the workpiece. During this process, it is inevitable to encounter some problems. How should we handle and respond? When the cross-sectional quality and dimensional accuracy of the workpiece are required to be high in the processing of stamping parts, a trimming process can be added after the punching process or a precision punching process can be directly adopted. In order to improve the stability of precision stamping process, it is sometimes necessary to increase the number of processes to ensure the quality of stamping parts. Many times, the number of bending processes for a workpiece mainly depends on the complexity of its structural shape, depending on the number of bending angles, relative positions, and bending direction. When the bending radius of the bent part is less than the allowable value, an additional shaping process is added after bending. Similarly, the number of drawing processes for deep drawing parts is related to material properties, drawing height, number of drawing steps, drawing diameter, material thickness, and other conditions, and can only be determined through calculation of the drawing process. When the fillet radius of the deep drawn part is small or the dimensional accuracy requirement is high, a shaping process needs to be added after the deep drawing. On this basis, the determination of the number of stamping processes should also comply with the existing mold making capacity and stamping equipment status of the enterprise.

The mold making ability should ensure the corresponding improvement of mold processing and assembly accuracy requirements, otherwise only the number of processes can be increased. For cutting workpieces with simple shapes, a single process mold is used to complete the process; On the contrary, for stamping parts with complex shapes, due to limitations in the structure or strength of the mold, the inner and outer contours should be divided into several parts for stamping, requiring multiple stamping processes

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