Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1980-07-16
1982-11-16
Husar, Francis S.
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72 26, 72 31, 73584, B21D 310, G01H 1500
Patent
active
043589456
ABSTRACT:
Piezoelectric transducers are mounted on support members of a gag press for sensing pressure vibrations arising in a workpiece in part as reflections of an initial pulse produced by the striking of the workpiece by a press ram at the initiation of a straightening operation. An electrical circuit is connected to the transducers for analyzing the sensed pressure waves and for comparing the analyzed waves to pre-established sound-threshold data stored in a memory. Upon detecting pressure waves indicative of an internal structural flaw in the workpiece, a microprocessor in the electrical circuit signals a ram drive to raise the ram and thereby terminate straightening operations, the defect-bearing workpiece being transferred to a scrap store or to a heat treatment plant by a sorter according to signals from the microprocessor. The press assembly includes position monitors juxtaposable to the workpiece in the press for determining workpiece curvature, the microprocessor being connected to these monitors and to a ram mount for adjusting in response to signals from the monitors the horizontal position of the ram prior to a downward workpiece-bending stroke thereof. Upon detecting the straightening of the workpiece according to stored tolerance data, the microprocessor elevates the ram and has the workpiece conveyed away for further finishing operations. The press assembly includes in a feeder an automatic centering or grinding apparatus and an oiling device for preparing a workpiece for sound-wave transmission over the supports to the transducers.
REFERENCES:
patent: 3949588 (1976-04-01), Seo
patent: 4144730 (1979-03-01), Judge
patent: 4154073 (1979-05-01), Galdabini
Metalloberflache, No. 5, Published by the Hanser-Verlag in Munich, West Ger., 1979.
Husar Francis S.
Ross Karl F.
Scherer Jonathan L.
Zahnradfabrik Friedrichshafen Aktiengesellschaft
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