Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1988-07-01
1990-04-24
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72407, B21J 1302
Patent
active
049189700
ABSTRACT:
According to the present invention, there is provided a fully enclosed die forging apparatus having an upside die and an underside die disposed opposedly in a vertical direction between a slide and a bolster. There is an upside cylinder mechanism contained in the slide which urges the upside die downward. There is an underside cylinder mechanism contained in the bolster which urges the underside die upward. An upside punch is inserted in the upside die and moves synchronously with the movement of the slide. An underside punch is inserted into the underside die and is supported by the bolster. There is a cam mechanism that causes both punches to rush into the dies, respectively, by moving the upside die and underside die toward the underside punch at a speed slower than the moving speed of the slide. The cam mechanism has a push pin, and a cylinder with an abutting piston that prevents damage to the cam mechanism by reducing pressure that may be exerted on the cams.
REFERENCES:
patent: 1979931 (1934-11-01), Beche
patent: 4653310 (1987-03-01), Urata et al.
Aida Engineering Ltd.
Larson Lowell A.
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