Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form
Patent
1995-10-06
1998-07-28
Larson, Lowell A.
Metal deforming
By deflecting successively-presented portions of work during...
By use of work-contacting wiper and moving, work-holding form
72157, 72 202, 72 215, 72 201, B21D 704, B21D 905, B21B 3708
Patent
active
057849137
ABSTRACT:
A machine for cold bending a thick walled tube is provided which includes a rotatable bend die around which the tube is bent and a pressure die which engages an outer side wall of the tube tangential to the bend. The pressure die has a pinch-type tube groove with multiple radiuses which receives the tube and substantially prevents relative movement between the pressure die and the outer side wall of the tube. The machine also includes a pressure die boost system which linearly advances the pressure die in a forward direction as the bend die is rotated. The boost system includes a linear actuator and an electro-hydraulic control system which automatically drives the linear actuator in accordance with a pre-programmed profile of pressure and flow parameters. The linear actuator has a hydraulic cylinder with a piston, a pusher coupling the piston to the pressure die, and ports in the cylinder on opposite sides of the piston. The electro-hydraulic control system has a hydraulic pump which provides hydraulic fluid to the cylinder, a proportional flow directional valve which varies flow of the hydraulic fluid from the hydraulic pump to each of the ports, a proportional pressure control valve which varies pressure of the hydraulic fluid in the cylinder, a sensor which detects a rotational angle of the bend die, and a microprocessor based controller. The controller receives a signal from the sensor representative of the rotational angle of the bend die and sends control signals to the valves to set the flow and pressure of the hydraulic fluid to pre-programmed levels at pre-programmed rotational angles of the bend die.
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Butler Rodney
Larson Lowell A.
Pines Manufacturing
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