Hydraulic press

Details Hydraulic press Hydraulic press

1980-03-26

1981-09-29

Crosby, Gene P.

Metal deforming

By three or more coacting relatively movable tools

With means to actuate tools in sequence

72 7, 72 21, 7245318, B21D 500

Patent

active

042915694

ABSTRACT:
A hydraulic press assembly for forming a U-profile from a rectangular plate comprises horizontally and vertically reciprocatable press members each having two hydraulic actuating cylinders. The horizontal cylinders are energized by respective variable-displacement pumps provided with servomechanisms operated by an electronic control circuit for selectively varying pumping rates to center a plate prior to a first bending phase in which the pump output ducts are connected to the vertical cylinders. During the first bending phase, synchronization of the action of the vertical cylinders is effectuated via control-circuit adjustment of the pump servomechanisms, while horizontal centering is maintained by means of an additional hydraulic circuit connectable by the control circuit to the horizontal cylinders. During a second bending phase, constituting opposing motion by the horizontal presses to form the already bent plate about a semicylindrically shaped head on the vertical press, horizontal centering is attained by selective control-circuit adjustment of the servomechanisms to incrementally differentiate the pressurizations of the horizontal cylinders.

REFERENCES:
patent: 2066025 (1936-12-01), Zublin
patent: 2342745 (1944-02-01), Maize
patent: 2734550 (1956-02-01), Glenn
patent: 2828531 (1958-04-01), Bath

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