MANUFACTURING APPARATUS AND MANUFACTURING METHOD FOR STRETCH FORMED PRODUCTS

摘要

Provided are a manufacturing apparatus and manufacturing method for stretch formed products with which it is possible to improve the yield of material in stretch forming that is performed while clamping a blank using a lock bead. The manufacturing apparatus for stretch formed products is provided with: a die and blank holder having clamping surfaces that face each other; a punch for stretch forming the forming region of a blank of a sheet material by relatively pressing the forming region of the blank in towards the die when the margin of the blank is clamped by said clamping surfaces of the die and the blank holder; and lock beads, which are provided on the clamping surfaces of the die and the blank holder in shapes that are similar to each other, which have, from the outer edges of the die and the blank holder to the centers thereof, first surfaces, second surfaces that intersect with the first surfaces, and third surfaces that intersect with the second surfaces, and in which the first surfaces have multiple depressions and protrusions.