Metal deforming – With means to drive tool – Including yieldable connection in drive train to movable tool
Patent
1994-11-21
1996-09-03
Jones, David
Metal deforming
With means to drive tool
Including yieldable connection in drive train to movable tool
7245314, B21J 712
Patent
active
055512747
ABSTRACT:
In a stamping press, an outer slide lowers an upper holding ring toward a lower holding ring for pinching the edge of a piece part for maintaining the piece part in fixed position between a lower die and a moveable upper die. Further downward displacement of the upper holding ring also moves the lower holding ring downward, stretching the piece part over the lower die. Striking of a lower die support by the lower holding ring is cushioned by gas-filled cylinders. With the stretched piece part maintained in fixed position on the lower die by the upper and lower holding rings, an inner slide then lowers the upper die toward the lower die for stamping the piece part. A drive mechanism lowers the outer and inner slides via respective pluralities of pull rods coupled to the slides. With the upper holding ring traveling at high speed at mid-stroke when it strikes the lower holding ring, a large instantaneous and momentary impact force is experienced which causes damage to press components over time. An impact absorber is attached to each of the pull rods coupled to the outer slide (and may also be connected to the pull rods coupled to the inner slide) to absorb the high impact force and cushion striking of the lower holding ring by the upper holding ring. Each impact absorber includes one or more stacked disc springs disposed about a respective pull rod for deflecting the high impact force and isolating the pull rod and associated linkage from this force.
REFERENCES:
patent: 2393771 (1946-01-01), Heintz
patent: 3417599 (1968-12-01), Burns
patent: 4610156 (1986-09-01), Kaminshi et al.
patent: 4890476 (1990-01-01), Takahashi et al.
patent: 5078003 (1992-01-01), Oishi
Clearing Niagara, Inc.
Jones David
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