초록 ▼

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

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.

대표청구항 ▼

A hydraulic press assembly for forming U-shaped profiles in the production of pipe sections, comprising: a supporting frame; vertically reciprocatable press means carried by said frame for bending a rectangular plate during a first phase of a deformation process; first horizontally reciprocatable pr

A hydraulic press assembly for forming U-shaped profiles in the production of pipe sections, comprising: a supporting frame; vertically reciprocatable press means carried by said frame for bending a rectangular plate during a first phase of a deformation process; first horizontally reciprocatable press means on said frame; second horizontally reciprocatable press means mounted on said frame and operating in a common plane with said first horizontally reciprocatable press means for coacting therewith in bending a plate during a second phase of a deformation process; aligning means on said frame for centering a plate with respect to said press means prior to said first phase; hydraulic drive means on said frame for actuating said press means, said drive means including a plurality of hydraulic cylinders for operating each horizontally reciprocatable press means; electronic control means operatively connected to said drive means for sequencing the actuation of said press means; and synchronization means on said frame for centering a plate with respect to said press means during said first and second phases, said synchronization means including position monitors engageable with a plate for detecting the position and orientation thereof, said control means being operatively connected to said synchronization means for selectively adjusting, via said drive means, the pressurization of said cylinders in response to signals from said monitors.