The underlying invention relates particularly to a hydraulic forming machine, more particularly a forging hammer, for workpiece forming, comprising a hydraulic cylinder for driving a ram configured for workpiece forming, and a hydraulic circuit configured for operation of the hydraulic cylinder, wherein the hydraulic circuit has an actuator with an adjustably variable volume flow via which a first hydraulic working chamber of the hydraulic cylinder, used to accelerate the ram during the execution of a working stroke (A) for workpiece forming, can be provided with hydraulic fluid. The hydraulic circuit is configured to adjust and vary the volume flow of the valve or actuator, depending on a setpoint speed (Vsoll) of the ram to be achieved in an acceleration phase of a working stroke (A), and to optimize the subsequent movement phase.

A method for hot forming of a cast forging ingot uses a forging device with radially guided forging dies of which each have two die parts, which can be radially moved relative to each other and of which the inner die part bearing a forging tool is drive-connected, using a hydraulic cylinder, to the other, outer die part, which can be driven using an eccentric drive. In order to provide advantageous forging conditions, the forging ingot is formed under heat, first using the forging dies driven by the eccentric drive, in near-surface forge processing with a degree of deformation which is above the critical degree of deformation and which excludes the formation of cracks, and then, with the outer die parts stopped, with the aid of the inner die parts driven by the hydraulic cylinders, in forge pressing with a bite ratio of >0.5.

A method for hot forming of a cast forging ingot uses a forging device with radially guided forging dies of which each have two die parts, which can be radially moved relative to each other and of which the inner die part bearing a forging tool is drive-connected, using a hydraulic cylinder, to the other, outer die part, which can be driven using an eccentric drive. In order to provide advantageous forging conditions, the forging ingot is formed under heat, first using the forging dies driven by the eccentric drive, in near-surface forge processing with a degree of deformation which is above the critical degree of deformation and which excludes the formation of cracks, and then, with the outer die parts stopped, with the aid of the inner die parts driven by the hydraulic cylinders, in forge pressing with a bite ratio of >0.5.

A method for material forming uses a movable tool and a drive unit the method including moving the drive unit to provide kinetic energy to the tool, for the tool to strike a work material, so as to form the work material the method including providing an impact head between the drive unit and the movable tool, and providing the kinetic energy to the tool by the drive unit striking the impact head, the impact head (extending in the direction of the stroke from an impact end to a base region, where the base region is closer to the tool than the impact end. The method includes arranging the impact head so that the impact end has laterally, in relation to the direction of the stroke, a smaller extension than the base region.

A method for material forming uses a movable tool and a drive unit the method including moving the drive unit to provide kinetic energy to the tool, for the tool to strike a work material, so as to form the work material the method including providing an impact head between the drive unit and the movable tool, and providing the kinetic energy to the tool by the drive unit striking the impact head, the impact head (extending in the direction of the stroke from an impact end to a base region, where the base region is closer to the tool than the impact end. The method includes arranging the impact head so that the impact end has laterally, in relation to the direction of the stroke, a smaller extension than the base region.

The present invention relates, in particular, to a forging hammer comprising a striker and a hydraulic linear drive that is coupled to the striker and is designed to drive the striker, which drive comprises a hydraulic circuit having a servo-motor hydro pump, a hydraulic cylinder, in particular a differential cylinder, which is fluidically connected downstream of the hydro pump via a directional valve module, and a servo-motor hydro generator, which is fluidically connected downstream of the hydraulic cylinder via the directional valve module, and comprising in addition a control unit configured at least for the simultaneous control of the hydro pump, the hydro generator and the directional valve module.

The present invention relates, in particular, to a forging hammer comprising a striker and a hydraulic linear drive that is coupled to the striker and is designed to drive the striker, which drive comprises a hydraulic circuit having a servo-motor hydro pump, a hydraulic cylinder, in particular a differential cylinder, which is fluidically connected downstream of the hydro pump via a directional valve module, and a servo-motor hydro generator, which is fluidically connected downstream of the hydraulic cylinder via the directional valve module, and comprising in addition a control unit configured at least for the simultaneous control of the hydro pump, the hydro generator and the directional valve module.

A two-step auto stroke hydraulic breaker includes a cylinder including a high-low pressure chamber, a high pressure chamber, and a pressure converting chamber including a pilot port, a high pressure connecting port connected to the high pressure chamber, a sensing port, an oil tank port, a long stroke port, and a short stroke port, a piston including small diameter portions, upper and lower large diameter portions, a sensing fluid groove between the upper and lower large diameter portions, and a return fluid groove formed on the lower the large diameter portion, a fluid circuit unit to control a supply direction of the fluid to the cylinder and to generate a fluid pressure to selectively change a stroke, and a chisel to break the bedrock when a lower portion of the piston descends to impact the chisel during a descending operation.

A forging machine with one or more hammers, comprising, for each hammer, an eccentric shaft (1) adapted to rotate about a first axis; a connecting rod (2), adapted to be actuated by the eccentric shaft operating as crank; a guiding frame (10); wherein the hammer is adapted to perform an alternating working movement within said guiding frame along a second axis perpendicular to the first axis; wherein the hammer comprises a hydraulic cylinder (8) provided with a hollow body (5), to which a forging member (15) is externally fixed, and with a piston (3) at least partially inserted within said hollow body and removably coupled to the connecting rod; wherein a first hydraulic chamber (6), arranged between piston and hollow body, allows to move the hollow body away from and/or towards said piston; wherein uncoupling means are provided for uncoupling the piston from the connecting rod.

A forging machine with one or more hammers, comprising, for each hammer, an eccentric shaft (1) adapted to rotate about a first axis; a connecting rod (2), adapted to be actuated by the eccentric shaft operating as crank; a guiding frame (10); wherein the hammer is adapted to perform an alternating working movement within said guiding frame along a second axis perpendicular to the first axis; wherein the hammer comprises a hydraulic cylinder (8) provided with a hollow body (5), to which a forging member (15) is externally fixed, and with a piston (3) at least partially inserted within said hollow body and removably coupled to the connecting rod; wherein a first hydraulic chamber (6), arranged between piston and hollow body, allows to move the hollow body away from and/or towards said piston; wherein uncoupling means are provided for uncoupling the piston from the connecting rod.