The production process of automobile metal stamping parts is: blanking and punching-punching incision-flanging forming-incision-flanging. There are many forms of tearing and skewing in the forming process of automobile metal stamping parts. The tearing parts are mainly distributed at the hole pattern of the part, the corner of the side wall and the junction of the R arc and the wall neck, etc. Due to the differences of stamping and process conditions, the proportion of each fractured part is different. The tear can be a one-time forming tear, or a tear caused by the development of fatigue cracks, that is, invisible cracks.
In terms of materials of automotive metal stamping parts, materials with good tensile properties are used. Choose a reasonable size and shape of the blank, and use punching to ensure the quality of the edge of the blank; then improve the edge condition of the blank. Generally, the standard of the concave flange blank is determined by correspondingly raising the material standard, and the punching capacity is adjusted to avoid cracking. Secondly, it is necessary to ensure that the void space between the punch and die is uniform, so that the resistance of the material into the die is also uniform, which is also beneficial to reduce splitting.
When splitting occurs due to elongation, the ideal forming quality of automotive stamping parts can be fully ensured by increasing the radius of the convex and concave die fillet and adjusting the pressing force accordingly to reduce the deformation resistance of the flange deformation zone.