The stretching and plastic deformation process of metal stamping parts is mainly composed of three stages: uniform elongation stage, partial elongation stage, and cracking stage. The uniform elongation stage is the ideal stage while the material is in the length direction, and the thickness is uniformly thinned. The quality is good, smooth and the original roughness of the material has no obvious change, which is almost invisible to the naked eye.
In the local elongation stage, the material is basically close to the limit of elongation. At this time, the purpose of elongation is achieved mainly through local severe and rapid deformation. In this way, the length direction is elongated while the thickness direction is sharply thinned, due to the flow of metal stamping parts. Insufficient, rough surface, obvious graininess, the naked eye looks like orange peel, the closer it is to the cracking, the rougher the surface, and as the degree of necking increases, the surface will appear off-white. These two are more obvious Characteristics
Of course, the relationship between it and the thickness of the material needs to be summarized in actual experience. My method is to do a cutting test, cut parts with different degrees of phenomenon, and then measure the degree of thinning of the metal stamping products. Focus on and manage areas prone to cracking.
Link to this article：The mechanism of material deformation of metal stamping parts
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