Method of controlling the stroke frequency of a forging machine and forging machine for carrying out the method

Abstract

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.

Dependencies are inferred from the claim text.