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Defect prevention and precision improvement measures in the processing of stamping parts
In the process of pressing parts, any slight error will lead to defects, such as cracks under small bending radius and substandard bending height. It is necessary to further analyze its causes to ensure the accuracy of stamping parts processing. In the processing of stamping parts, if the radius is less than 0.5 when bending ordinary cold-rolled steel sheets, cracks on the outer surface will occur. This is mostly caused by compressive or tensile stress on the inner and outer surfaces of the bent part of the stamping part. For a certain bending radius, the greater the thickness of the material and the longer the bending width, the easier it is to produce cracks. The former is because the distance from the neutral surface to the inner surface becomes larger, and the latter is because the bending width limits the amount of external deformation, so it is necessary to control the bending radius of the stamping part. The fact that the stamping parts cannot reach the required bending height may be because the material is in a free state between the convex and concave dies, which is prone to mis-shift. Tests have proved that in the L-shaped bending, the bending radius, the size of the die radius and the degree of finishing of the side wall cause the friction to increase and the material is pulled into the die, and the length of the material in the rotary convex die decreases. In order to further improve the processing accuracy of stamping parts, it is necessary to study the rationality, economy and value of its dimensional accuracy. In the case of mass production, progressive bending molds should be used as much as possible. Since the gap of the guide pins is directly related to the accuracy of the parts, it is also helpful to improve the accuracy if it is adjusted. From the perspective of the structure and shape of the stamping parts, when the thickness and hardness of the material are different, the height dimension cannot be kept constant, a post-bending resection process should also be appropriately added to ensure the desired processing accuracy.