Abstract: The present invention relates to a servo hydraulic press for sheet metal forming. The press comprises a hydraulic cylinder, at least two servo motors and at least two pumps for supplying pressurized fluid to the hydraulic cylinder, where each servo motor drives at least one pump. The servo motors are operable at variable speed, and the first servo motor and first pump are operable in an opposite direction to the second servo motor and the second pump. With this arrangement, the servo hydraulic press may be operated at low speed without causing damage to the pumps or motors.

Abstract: The present invention relates to a method, and system for performing such method, for producing a press hardened part (2?) of heat treatable material having zones of different structure by partially heating a blank (2) before the blank is processed. The method (100) comprises the steps of arranging (104) the blank in a furnace (10) for heating the blank to a temperature equal to or above the austenitization temperature of the material of the blank to get the blank into an austenitic phase, in a IR heating station (10) partially heating (106), by means of IR radiation (24), at least one first zone (2a) of the blank thereby keeping the at least one first zone of the blank in the austenitic phase, and arranging (108) the blank in a processing unit (30) for forming and quenching the blank to a press hardened part.

Abstract: A method for locally increasing pressing pressure on a press tool having an abutment surface for being clamped onto a clamping surface in a press comprises providing a power unit smaller than the abutment surface and having an internal space, positioning the power unit between the clamping surface and the abutment surface, pressing the clamping surface against the abutment surface, connecting the internal space to a source of pressurized hydraulic fluid, and supplying the pressurized hydraulic fluid to the internal space thereby causing the power unit to expand and to exert a local pressure on the abutment surface.

Abstract: An apparatus is provided for compensating for such deformations as occur in operation in first and second clamping surfaces intended for a tool in a press. The clamping surfaces are reciprocally moveable towards and away from one another in order to move a first and second part of the tool towards and away from one another, and the first and second tool parts have a first and second abutment surface for abutment against the first and second clamping surfaces and the deformations cause uneven pressure in at least one contact region between the tool and the clamping surfaces. According to the present invention, there is disposed, in at least one contact region between a clamping surface and an abutment surface, a power unit which, on activation, is operative to press, away from the clamping surface located in the contact region at least a part of the abutment surface of the tool located there.

Abstract: A method for locally increasing pressing pressure on a press tool having an abutment surface for being clamped onto a clamping surface in a press comprises providing a power unit smaller than the abutment surface and having an internal space, positioning the power unit between the clamping surface and the abutment surface, pressing the clamping surface against the abutment surface, connecting the internal space to a source of pressurized hydraulic fluid, and supplying the pressurized hydraulic fluid to the internal space thereby causing the power unit to expand and to exert a local pressure on the abutment surface.

Abstract: An apparatus for hydroforming workpieces includes a first (11) and a second tool part (13) and a press device (1, 6, 7) which closes and holds together the tool parts during a forming cycle. The first tool part (11) is mounted in the press device (1, 6, 7). The second tool part (13) is disposed for insertion into and removal from the press device (1, 6, 7), for example with the aid of a conveyor (8). Further, the apparatus includes a supply of pressurized fluid (12) to the first tool part (11).