In a method for thickening a plastically deformable hollow body wall of a hollow body, with effective radial support of the unthickened hollow body wall on an outer supporting face of an outer mold and with effective radial support of the hollow body wall on an inner supporting face of an inner supporting body, the hollow body is acted on by a compressive force by two application members at application points by moving the application members towards one another in the axial direction with a compressing movement. The application points on the hollow body are distanced from one another in the axial direction. An expansion space of the outer mold is arranged between the application points. Due to the compressing movement of the application members, material of the hollow body wall between the application points is plasticised in the region of the expansion space of the outer mold, and plasticised material of the hollow body wall flows into the expansion space of the outer mold, thus thickening the hollow body wall.

In a method for thickening a plastically deformable hollow body wall of a hollow body, with effective radial support of the unthickened hollow body wall on an outer supporting face of an outer mold and with effective radial support of the hollow body wall on an inner supporting face of an inner supporting body, the hollow body is acted on by a compressive force by two application members at application points by moving the application members towards one another in the axial direction with a compressing movement. The application points on the hollow body are distanced from one another in the axial direction. An expansion space of the outer mold is arranged between the application points. Due to the compressing movement of the application members, material of the hollow body wall between the application points is plasticised in the region of the expansion space of the outer mold, and plasticised material of the hollow body wall flows into the expansion space of the outer mold, thus thickening the hollow body wall.

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 system and method for detecting a defective part and the type of defect formed during stamping operations. The system and method will not only detect the defect but also the nature of the defect and the time at which the defect occurred during stamping operations. Such information is useful not only in quality control but also in isolating a problem which may exist in stamping operations and thus eliminating time for isolating such problems and correcting them. The system and method uses a profile of a properly stamped part to detect a defect, and the root cause of the defect.

A system and method for detecting a defective part and the type of defect formed during stamping operations. The system and method will not only detect the defect but also the nature of the defect and the time at which the defect occurred during stamping operations. Such information is useful not only in quality control but also in isolating a problem which may exist in stamping operations and thus eliminating time for isolating such problems and correcting them. The system and method uses a profile of a properly stamped part to detect a defect, and the root cause of the defect.

Provided is a press forming apparatus for a semi-solid metal material, including: a slide caused to make a reciprocating linear motion; a sub-slide mounted so as to be movable relatively to the slide; a fluid pressure mechanism interposed between the slide and the sub-slide, which is capable of moving the sub-slide relatively to the slide by fluid pressure; an upper die mounted to the sub-slide; and a lower die. The press forming apparatus is configured to press-form the material while applying predetermined pressure to the material for a predetermined period by bringing, along with descent action of the slide, the upper die into contact with the material fed into the lower die, then stopping the slide at a predetermined position, and moving the upper die mounted to the sub-slide relatively to the slide by the fluid pressure mechanism under a state in which the slide is stopped.

A press for pressing workpieces can have a) at least two pressing tools and at least one slide that performs working movements with an associated working stroke, b) at least one hydraulic slide drive unit for the slide, which separates a first sub-chamber and a second sub-chamber of a working chamber, and c) at least one slide position measurement device. Additionally, the press can include d) at least one medium reservoir, e) at least one first hydraulic delivery device connected to the first sub-chamber and to the medium reservoir, and f) at least one second hydraulic delivery device. The press can further include g) at least one controllable hydraulic valve, and h) a control device that checks the volumetric flows, pressures, and flow direction of hydraulic medium as a function of the measured slide position and stored or desired movement profiles of the slide and/or of input information from users.

A press for pressing workpieces can have a) at least two pressing tools and at least one slide that performs working movements with an associated working stroke, b) at least one hydraulic slide drive unit for the slide, which separates a first sub-chamber and a second sub-chamber of a working chamber, and c) at least one slide position measurement device. Additionally, the press can include d) at least one medium reservoir, e) at least one first hydraulic delivery device connected to the first sub-chamber and to the medium reservoir, and f) at least one second hydraulic delivery device. The press can further include g) at least one controllable hydraulic valve, and h) a control device that checks the volumetric flows, pressures, and flow direction of hydraulic medium as a function of the measured slide position and stored or desired movement profiles of the slide and/or of input information from users.

A pressing apparatus includes a driving device, a platform configured to support a workpiece, a movable support mounted to the driving device, a pressing member rotatably mounted to the movable support, and a limiting block mounted on the platform. The movable support is movable in a direction substantially perpendicular to the platform. The limiting block rotates the pressing member down pressing the workpiece between the platform and the pressing member when the movable support moves.

A forging method is set in a shaping hole of a die body, and the forging material is pressed with a punch to perform plastic shaping of the forging material. Ultrasonic vibration having a vibration frequency is applied to the die body with a vibration applying apparatus during the plastic shaping of the forging material. The vibration frequency is converged to a resonance frequency of the die body when the vibration frequency is within a tracking range of the vibration applying apparatus during the plastic shaping of the forging material. When the tracking range is shifted in accordance with a discontinuous change of the resonance frequency during the plastic shaping of the forging material to deviate from the vibration frequency, the reference frequency is changed so as to fall within a shifted tracking range.