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Dimensional accuracy of the stamping part

- May 11, 2018 -

Most of the steel products are stamped products. Stamping can produce workpieces with stiffeners, ribs, undulations, or flanging that are otherwise difficult to manufacture to increase their rigidity. Compared with castings and forgings, stampings are thin, uniform, light and strong. The accuracy of workpieces can reach micrometers, and the repeat accuracy and specifications are consistent. Holes and bosses can be punched out.

Stampings are forming methods that require the external force to be exerted on the plate, strip, pipe, and profile by the press and mold to produce plastic deformation or separation, thereby obtaining the desired shape and size of the workpiece. In the process, it will inevitably encounter some problems. How should we deal with it and respond?


When the workpiece quality and dimensional accuracy of the stamping part are required to be high during the stamping process, the dressing process may be added after the stamping process or the precision blanking process may be directly used. In order to improve the stability of the precision stamping process, it is sometimes necessary to increase the number of processes to ensure the quality of the stamped parts.

In many cases, the number of steps in a bending part depends mainly on the complexity of its structural shape, depending on the number of bending angles, the relative position and the bending direction. When the bending radius of the bending member is less than the allowable value, a plasticizing process is added after the bending.

 In the same way, the number of processes for drawing parts is related to material properties, drawing depth, number of drawing steps, drawing depth diameter, and material thickness, etc., which must be determined by the drawing process calculation. When the deep drawing piece has a small fillet radius or a high dimensional accuracy, it is necessary to add a shaping process after deep drawing.


On this basis, the number of stamping process steps should also be determined in line with the company's existing mold making capabilities and stamping equipment. Molding capacity should be able to ensure that the mold processing, assembly accuracy requirements increase accordingly, otherwise you can only increase the number of processes.


In punching a workpiece with a simple shape, a one-step mold is used to complete the punching; instead of punching out a stamped part with a complicated shape, since the structure or strength of the mold is limited, the inner and outer contours should be divided into several parts, and a plurality of punching processes are required.

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