Importance

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Abstract

An extruding press has a housing defining an axis, an end frame displaceable axially on the housing, and a plurality of cylinders on the housing. Respective pistons having axially oppositely directed front and rear faces subdivide the cylinders into front and rear compartments and respective piston rods extend from the pistons axially forward through the respective rear compartments out of the respective cylinders and are connected to the end frame. A tool is fixed on the housing so that a workpiece positioned between the tool and the end frame can be extruded through the tool when the front compartments are pressurized to axially rearwardly displace the end frame and press the workpiece rearward against the tool. Respective fluid-powered actuators braced between the housing and the pistons can be pressurized to displace the end frame forward away from the tool. Passages extending between the compartments and controllable valves in the passages permit free fluid flow between the compartments. Respective filler bodies projecting rearward from the rear faces through the respective front compartments out of the respective cylinders each reduce an effective surface area of the respective rear face so that it is generally equal to an effective surface area of the front face of the respective piston. Respective elements engaging the filler bodies permit same to move radially relative to the respective piston.

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First Claim