Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent
1995-08-23
1997-02-18
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
83 30, 83684, 83685, 425295, B26D 701, B26F 114
Patent
active
056038828
ABSTRACT:
The invention is directed to an improved method and apparatus for a forward extrusion piercing which is able to pierce a long through-hole of slenderness (length/hole diameter) 5 or the like in a hot blank with a high accuracy by one stroke of the piercing punch so as to produce hollow metallic products. In the process, a hot blank forged with a determined outer shape is set on a lower die, and an upper die assembly is provided with the piercing punch, a holding guide and an upper die coaxially with the lower die. Downward movement of the upper die assembly enables the holding guide to hold the blank and then the punch moves down with a retention by a through-hole of the holding guide through which the punch passes, against transverse displacement of the punch. The tip of the punch is adapted to enter a through-hole of a receiver die at its lower stroke end in order to cut off redundant piece of the blank.
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Fujitani Hiroki
Koga Takehiro
Takano Yoshio
Kurimoto Ltd.
Smith Duane S.
TDF Corporation
Woo Jay H.
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