The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1999
Filed:
Sep. 16, 1997
Alfred Seeber, Garsten/Steyr, AT;
Rupert Wieser, Seitenstetten, AT;
GFM Holding Aktiengesellschaft, Steyr, AT;
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.