What are the common problems in the fabrication of stamping parts for automobile sheet metal parts?

Automotive sheet metal is a comprehensive cold working process for sheet metal (usually below 6mm), including shearing, punching/cutting/compounding, folding, welding, riveting, splicing, forming (such as auto body), etc. Its remarkable feature is that the thickness of the same part is the same. The products processed by the sheet metal process are called sheet metal parts. The sheet metal parts referred to by different industries are generally different, and are mostly used for assembly.

Burrs: In the process of punching or cutting corners, the residual material is not completely left, and burrs are generated in the lower part of the truncated surface of the steel plate. Based on the truncated surface, when the burr height is more than 0.2mm, the iron powder that occurs will damage the mold and cause convex and concave.

Concave and convex: The surface of the material is abnormally convex or concave, which is caused by the mixing of foreign objects (iron filings, dust) in the uncoiled wire.

Roller printing: caused by foreign matter attached to the cleaning roller or feeding roller (occurs at a fixed pitch), in general, the foreign matter of the roller printing on the sheet can be removed.

Slippage: Caused by roller slippage, which occurs when a sudden stop or acceleration occurs.

Coil crushing may cause wrinkling at the edge: the guide roller of the uncoiler line may be a wrinkle caused by the small gap between the guide rollers on the die, which is caused by the unbalanced feeding of the coil.

Scratches: The main reason for scratches on auto parts, sharp scratches on the mold or metal dust falling into the mold, the preventive measures are to grind the scratches on the mold and remove the metal dust.

Bottom cracking: The main reason for the bottom cracking of the part is poor material plasticity or too tight pressing of the mold blank holder. The preventive measures are to replace the material with better plasticity or loosen the blank holder.

Wrinkles on the side wall: The main reason for the wrinkle on the side wall of the part is that the thickness of the material is not enough (smaller allowable thickness is thinner) or eccentricity occurs when the upper and lower molds are installed, resulting in a large gap on one side and a small gap on the other side. Preventive measures For instant material change and re-adjustment of molds.