JPS5691945A - Forging device - Google Patents

Abstract

PURPOSE: To forge a part having an undercut in one process by inserting the cam pieces formed to the inside surface shape of a molding into a blank material and drawing the outside circumference.

CONSTITUTION: When a slide 6 lowers, all of six cam pieces 6 enter the inside of a blank material A. A punch 5 pressed by a spring 7 moves downward and the cam pieces 9 are gradually expanded so that the outer side faces thereof contact the inside surface of the blank material A. When the slide 6 descends further, a male die 3 draws the outside circumference of the opening inlet part of the blank material A. Thereupon, the inside surface of the blank material A deforms, and abuts on the outside shape of the cam pieces 9, whereby the spherical working having an undercut is accomplished. After the molding, the slide 6 ascends, and a knock-out 12 contacts the top surface of the molding, thereby parting the male die 3 and the molding. As the punch 5 ascends, the cam pieces 9 shrinks in the outside diameter and they are removed altogether from the molding. Near the top dead center, the molding is pushed out by a pin 13 and is taken out from the female die 1 by the knock-out of the press.

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