JPS5699040A - Die for manufacturing flanged hollow product - Google Patents

Abstract

PURPOSE: To perfectly fill the material in the space corresponding to the toothing part of the product, by forming the tip of the punching tool for press-forming the flange of the product, into a shape to intercept the inward flow of material or to cause outward flow of material.

CONSTITUTION: For example, at manufacturing a bossed gear blank, a punch (e) is placed so as to face a die (g); in which, the punch (e) is provided with an outer shape equivalent to the outer shape of the flange (b) of the product, and the die (g) is provided with a stepped inner shapes (f), (f'), equivalent to outer shapes of the flange (b) and the boss (a) of the product. A mandrel (h), possessing an outer shape equivalent to the inner shape of the center hole (c) of the product, is set at the center of the punch (e) so as to be extrusile. A material (i) is interposed between the punch (e) and the die (g), and then, the punch (e) is pressed to the material (i); at the same time, the mandrel (h) is extruded; hereby, a product is obtained. Hereupon, the annular face of the tip of the punch (e) is formed into a protruding annular face 3 whose section is shaped as an inclined roof, for example. Hereby, the material (i) is extruded outward along the inclined face of the outer edge and is perfectly filled in the space, corresponding to the toothing part (d), formed by the outer and inner surfaces of the punch (e) and the die (g).

COPYRIGHT: (C)1981,JPO&Japio