Metal deforming – With means to drive tool – With means to selectably control movement of tool
Patent
1997-09-16
1999-01-12
Jones, David B.
Metal deforming
With means to drive tool
With means to selectably control movement of tool
72402, 72446, 724525, 100257, B21J 746
Patent
active
058573780
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.
REFERENCES:
patent: 3783672 (1974-01-01), Morgolenko et al.
patent: 4148209 (1979-04-01), Bessho
patent: 5582059 (1996-12-01), Schubert
patent: 5669128 (1997-09-01), Futamura et al.
Seeber Alfred
Wieser Rupert
GFM Holding Aktiengesellschaft
Jones David B.
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