Press forming die assembly

Abstract

The invention relates to a die for press forming, wherein a panel (20) of a blank material (10) is formed by the press forming die. The press forming die comprises draw beads for controlling the amount of the blank material flowing into a draw forming portion during the press forming. The draw heads comprises a conventional first draw bead (in accordance with a first bead (15)) and a second draw bead (in accordance with a second bead (16)) in a direction intersecting the first draw bead. The second draw bead is provided so that strain (fold) occurring at a thick sheet portion (11) in a shrink forming of a flange portion (23) is not transmitted to a thin sheet portion (12), thereby inhibiting the rotary of the thick sheet portion (11).

Description

technical field [0001] The present invention relates to a die for stamping forming, which is provided with a stretch blanking die for controlling the inflow amount of a blank into a stretch forming part during stamping forming, and particularly relates to a die for stamping and forming of plates having different thicknesses and rigidities. The improvement of the shape of the drawing blank formed by the stamping forming of the collective blank. Background technique [0002] Panels such as vehicle door panels are manufactured by press forming a collective blank made of a plurality of sheets of different thickness and rigidity, which are joined together by butt welding. [0003] The mold used for press forming has a stretch forming part composed of a stretch forming concave part provided at the center of the die and a stretch forming convex part provided at the front end of the punch. The product surface corresponds to the forming surface. In the die for press forming, the pe...

AI Technical Summary

Problems solved by technology

However, in this technology, it is difficult to suppress the rotation of the material of the thick plate part caused by the movement of the assembled blanks to the stretch forming part, and the vertical wall edge of the product surface of the panel is Reduced plate thickness at the line

Therefore, the above problems cannot be solved

Especially when the corner portion of the stretch forming portion is close to the joint portion of the thick plate portion and the thin plate portion, the above-mentioned problem is severe.

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