Gfm Holding Aktiengesellschaft

Gfm, Inc.

V&m Deutschland Gmbh

Gfm Beteiligungs- Und Management Gmbh & Co Kg

Vallourec Deutschland Gmbh

Rupert Wieser

Alfred Seeber

Gottfried Blaimschein

Robert Koppensteiner

Rolf Kümmerling

Christoph Prasser

Otto Hein

Stefan Wiedenmaier

Pierre Lefebvre

Thomas Schlothane

Antonio Sergio Medeiros Fonseca

An apparatus for forging a hollow body from a pre-perforated hollow block includes forging tools that can be driven radially in relation to a forging axis, a clamping head which is displaceable on a guide bed in the direction of the forging axis and includes collet chucks for the hollow block, and a mandrel carriage which is arranged on the side of the clamping head facing away from forging tools, which is displaceable independently of the clamping head along the guide bed, and whose mandrel bar provided with the forging mandrel penetrates the clamping head coaxially to the forging axis. In order to provide advantageous constructional conditions the mandrel carriage includes an axial actuating drive for the mandrel bar and can be coupled in a tension-proof manner to the clamping head.

Apparatus for forging a hollow body from a pre-perforated hollow block

In a method of making a seamless hot-finished steel pipe a billet heated to a shaping temperature is pierced by a first shaping to a thick-walled hollow ingot which subsequently undergoes a radial forging process using an internal tool inserted in the hollow ingot and at least two forging jaws of a forging machine. The forging jaws act on the outer surface area of the hollow ingot, wherein the hollow ingot is turned and axially advanced in a clocked manner in the idle stroke phase of the forging jaws.

Method of making a seamless hot-finished steel pipe, and device for carrying out the method

A swaging machine (1) for swaging rod-shaped workpieces (W) has a ring-shaped forging box (3) supported in a machine frame (2) so as to be driven and rotated about the travel axis (A) of the workpiece (W), where in radial recesses (4) of the forging box forging punches (5) are accommodated which act against each other and can be lifted via a lifting drive (7) while the forging box rotates at the same time. To ensure swaging with a non-rotating workpiece (W) subjected to a pure longitudinal feed, the forging punches (5) are supported in the recesses (4) of the forging box (3) via pivotally mounted longitudinal guideways (13), and oscillating movements with a direction of movement lying in a normal plane (N) with respect to the travel axis (A) can be superimposed on the lifting movements of the forging punches (5) for swinging back the associated forging tools (6) relative to the forging box (13) during their contact with the workpiece at an angular velocity corresponding to the angular velocity of the rotation of the forging box, but directed in the opposite direction.

Swaging machine

For producing metallic bar stock there is first of all fabricated a primary product of substantially regularly round or angular cross-section, and this primary product is then deformed in cross-section to the final dimension corresponding to the bar stock by means of shaping. To provide for an efficient production of high-quality bar stock also in a minor quantity, the completely solidified primary product is subjected to a forging operation for a structural improvement before shaping it to the final dimension, during which forging off in one processing plane a spreading-restricted reduction of the cross-section in the range from (1.5 to 5):1 is effected.

Method of producing metallic bar stock

A forging machine (1) comprises at least two forging punches (5) acting against each other and longitudinally guided in a machine frame (2), which each have separate stroke drives (9) and stroke position adjusting means (10). To make the forging machine (1) suitable for a large forging range with a simple design, each forging punch (5) together with longitudinal guideway (8) and stroke position adjusting means (10) and the associated stroke drive (9) are combined to a forging unit (3) and disposed in a separate housing (7), which is pivotally or movably mounted in the machine frame (2) and for adjustment is supported on an actuator (11).

Forging machine

For controlling the stroke frequency of a forging machine (1), which comprises a mechanical stroke drive (3) for the stroke movement of the forging punch (2) and a hydraulic drive connection (4) between stroke drive (3) and forging punch (2), the rotational speed of the stroke drive (3) is adjusted to a high stroke frequency of the forging punch (2), and for reducing the stroke frequency the hydraulic pressure of the drive connection (4) is decreased for periodically succeeding drive strokes in accordance with the drive-related increase with constant rotational speed of the drive (3), while at the same time the forging punch (2) is preferably blocked in the vicinity of the upper dead center. For this purpose, the drive connection (4) is connected to an accumulator (20) via a control valve (23) to be actuated in dependence on the stroke movement.

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Seitenstetten, Austria

Rupert Wieser