JPS6158939U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 and 2 show the overall configuration of a forging die according to an embodiment of the present invention, where Figure 1 is a vertical cross-sectional side view at the latter stage of the punch forming stroke, and Figure 2 is a punch forming die. FIG. 3 is a longitudinal side view at the end of the stroke. FIG. 3 is a vertical side view of a conventional forging die, FIG. 4 is a perspective view of a hollow processed product, and FIG. 5 is a perspective view of a hollow stepped molded product. 2...Molding hole, 3...Die, 4...Upper mold holder,
6... Mandrel, 7... Punch, 8... Knockout member, a... Hollow processed product, b... Hollow hole, c... Stepped molded product.

Claims (1)

[Scope of utility model registration request] A die having a stepped forming hole, an upper die holder that moves up and down in opposition to the die, and a hollow hole of a hollow processed product supported by the upper die holder and inserted into the forming hole of the die. A mandrel that can be inserted into the die, and a punch supported by the upper die holder in a state fitted to the outer periphery of the mandrel, and when the upper die holder is lowered, the mandrel and punch are inserted into the forming hole of the die. In a forging die for forging a hollow stepped molded product by lowering the die by a predetermined stroke, the mandrel is supported to be movable in the vertical direction relative to the upper die holder, and a punch is installed in the forming hole of the die. A forging die characterized in that a knockout member is provided that comes into contact with the tip end face of the mandrel to restrict its movement in the latter half of the forming stroke.