Control analysis of wrinkle and crack in stamping

With the rapid development of the domestic automobile industry, stamping technology has also obtained great development in the field of automobile. Auto parts stamping production is prone to wrinkling, cracking problems, related causes and control measures are: 1, wrinkling and stack wrinkling is the most important and one of the most difficult problems in stamping production. Wrinkling defects will cause a lot of adverse consequences, serious will also form a stack. Wrinkling will have a serious impact on the appearance of the parts, especially after painting. Serious wrinkling will make the parts not be repaired, resulting in the scrapping of the parts. Reason: sheet metal Deep Draw Stamping in the process of stamping material flow imbalance, extrusion and can not be absorbed and eliminated. Solution: balance sheet flow speed. The solution:

(1) Welding to increase the drawing bar, increase the flow resistance of sheet metal;

​the wrinkled part of the pressure treatment, reduces the surface gap;

(3) Change the shape of a drawing bar, such as a round bar to a square bar, or change the size of a drawing bar;

(4) Increase the size of falling parts and increase the role of blank holder. Temporary measures for production:

(1) increase the blank holder force of the press;

⑵ in the relevant place pad tape;

(3) Adjust the balance block, reduce the local balance block gasket, increase the local sheet metal flow resistance.

611a5ada6d4173fe43a2b22696085b9c2, cracking and line (neck) crack generally in new mould when debugging or sheet, cracking directly leads to scrap parts, break line for parts to come the limits of cracking performance, after coating baking, materials stress release, is still likely to result in the cracking of the parts, therefore, must put an end to finished products in the process of stamping production line. Reason: Due to the smooth flow of sheet metal, the degree of tensile deformation of sheet metal in the stamping process exceeds the requirement of the elongation rate of the material itself, resulting in the cracking of the stamping part. Solution: improve the flow speed of sheet metal. The solution:

(1) Welding to reduce drawing bar, reduce sheet metal walking resistance;

⑵ Improve the surface finish;

(3) increase the piercing knife, increase the local sheet metal flow supply;

(4) Change the shape of drawbead (Fig. 7);

⑸ Reduce the size of the sheet edge. Temporary measures for production:

⑴ Apply lubricating oil at the crack or wound line;

(2) reduce the blank holder force;

(3) Adjust the balance block, increase the local balance block gasket, reduce the local sheet metal flow resistance.

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