Patent ID: 6237381
Filing Date: 2001-05-29
Classification: B21D

Abstract:
A power press comprising; a frame, a stationary portion connected to the frame, a press ram movably mounted on the frame, a die assembly have a portion connected to the ram and another portion connected to the stationary portion, a force modulator connected to the frame, and a die ring connected to the force modulator, said die ring releasably secured to a work piece to hold a peripheral portion of the work piece between the die ring and one of said portions of the die assembly while the work piece is formed by the die assembly, said force modulator produces a predetermined force on the press ram for incremental positions of the ram in response to the position of the ram relative to the stationary portion of the press, the force modulator includes a vessel, hydraulic fluid in the vessel, a hydraulic fluid container mounted on the vessel, and a regulator connected to the container controlling the flow of hydraulic fluid from the vessel to produce a predetermined force on the press ram for incremental positions of the ram in response to the position of the ram relative to the stationary portion of the press as the work piece is formed.