B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/78
B21D 24/02 (2006.01) B21J 13/00 (2006.01) B30B 15/00 (2006.01)
Patent
CA 1326172
ABSTRACT A power press, used for forging, stamping and forming metal workpieces, provided with a cushioning system including die cushions combined with snubbers and intensifiers and counterbalances. During the operation of a press abrupt changes in the velocity of certain moving parts of the press may damage or cause rapid wear to press, dies and workpeice. Cushioning systems in the past have utilized piston and cylinder actuators which require frequent replacement of seals and packing to prevent or limit leakage of air or oil. The present invention utilizes pneumatic bellows actuators which do not require seals. The hydraulic snubber and snubber-intensifier are closed systems in combination with a pneumatic bellows actuated die cushion. The snubber has a piston (814) slideable within cylinder assembly (800). During the upward stroke of the ram of the press the movable plate (50) of the die cushion is held back by the piston (814) to which it is attached through a piston rod by pressure created in the fluid above the piston so as to prevent a damaging impact on the movable die parts (26) and workpiece (22) supported by the air cushion. The fluid is allowed to flow from the top of the piston through a fixed orifice or an adjustable flow valve (850) to return to a reservoir within the die cushion or to the bottom of the cylinder. During the downstroke the piston causes an increase in pressure in the oil below the piston, which flows out through flow control valve (876), so as to increase the force holding the work in the die. A programmable controller may be used to control the valves (850) and (876) to produce a desired program of piston upward motion and oil pressure below the piston during the downstroke.
577956
Bozich George John
Kotynski Robert Joseph
Smedberg Kenneth Leonard
Macrae & Co.
Smedberg Kenneth Leonard
LandOfFree
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