JPS5666324A - Press die - Google Patents

Abstract

PURPOSE: To prevent the spring-back of the folded product, by inward inclining the side plane of the punch by an angle almost equal to the angle of spring-back, and by interposing the elastic body between the die and the housing holding the die slidably.

CONSTITUTION: The ram 18 and the upper holder 19 go down, and the pad 20 at first touches the work 15 and presses it to the punch 13. The ram 18 and the upper holder 19 further go down, and the dies 23, 23', cooperate with the punch 13 in folding both edges 16, 16', of the work 15 downward. The ram 18 and the upper holder 19 further go down, and the dies 23, 23', touch the stoppers 14, 14'; The ram 18 and the upper holder 19 further go down, and the housings 22, 22', also go down, and the elastic bodies 24, 24', are pressed upward and downward to cause an elastic deformation and to protrude toward the side plane 17 of the punch. As a result, both edges 16, 16', of the work 15 are bent inward by an angle almost equal to the angle of their spring-back action. After finishing the forming work, both edges 16, 16', cause the spring-back movement, resulting in the specified shape.

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