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Appearance defects of automotive stamping parts
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Appearance defects of automotive stamping parts

The appearance defects of punching machines mainly include cracks, neck shrinkage, pits, corrosion, wrinkles, burrs, burrs, indentations, scratches, overlaps, etc. Some common appearance defects of automobile stamping parts are introduced below.

automotive stamping parts

(1) neck shrinkage and cracking

The direct cause of necks and cracks is that the stress during stretch forming exceeds the limit of the material, thereby forming necks or cracks. Shrinkage necks and cracks generally occur in processes such as drawing, turning, and drilling, which directly affect the life and structural strength of auto parts. Therefore, if serious neck shrinkage or cracks occur, the parts will be disposed of according to scrap, and the manufacturing cost will be reduced. A substantial increase. Additionally, if neck shrinkage or cracks occur, outage line repairs typically take a long time, further increasing costs while reducing productivity.

(2) Folds and overlaps

Wrinkling and overlapping are due to the large difference between the size of the sheet in the thickness direction and the size in the plane direction, resulting in instability in the thickness direction. After the stress in the plane direction reaches a certain level, the thickness direction is unstable, resulting in wrinkling. Wrinkling is further intensified and overlapping occurs.

(3) Burr

Different degrees of burr defects in the blanking process of automotive stamping parts are generally unavoidable, but by improving the stamping process and stamping conditions, the burrs can be reduced. Occurrence not only makes the subsequent deformation process easy to crack due to stress concentration, but also brings difficulties to the delamination of the subsequent process blank. The big hair is easily scratched by the handle, and the welding is easy to drill when welding, or the welding is not good. Therefore, the burr defects that have occurred are generally eliminated by rework through documents, rolls, electrolysis, etc.