Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1986-12-15
1988-08-09
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72173, B21D 514
Patent
active
047619791
ABSTRACT:
A three-roller bending apparatus having a movable top roller and two stationary bottom rollers has a curvature measuring unit for automatically measuring the radius of curvature of a workpiece being bent and for displaying the measured value for an operator. The curvature measuring unit comprises three probes, at least one of which is a movable probe whose displacement produces an electrical output signal while the remaining probes are stationary. The probes are made to contact the surface of a workpiece, and the electrical output signal is applied to a calculating and display unit which calculates the radius of curvature of the workpiece and displays the result. The apparatus may further comprise a CPU which automatically controls both the rolling of the workpiece and the operation of the curvature measuring unit and determines when to terminate rolling based on the output of the curvature measuring unit. The apparatus may also have auxiliary rollers which press the workpiece against the bottom rollers, making it possible for the bottom rollers to move the workpiece even when a gap develops between the workpiece and the top roller.
REFERENCES:
patent: 3459018 (1969-08-01), Miller
patent: 3854215 (1974-12-01), Foster
patent: 3906765 (1975-09-01), Foster
patent: 4080815 (1978-03-01), Foster
Goodwin, L. E., "A Differential Transformer Gauge for Outside and Inside Diameters of Long Tubes", from E. I. du Pont de Nemours and Co. Report DP-263, Jan., 1958, (Instruments/TID-4500, 13th Ed., Suppl.), pp. 1-15.
"Closed-Loop Shape Control of a Roll-Bending Process", from Journal of Dynamic Systems, Measurement and Control, Hardt et al, Dec. 1982 vol. 104, pp. 317-322.
"Modelling of Elastic-Plastic Bending of Beams Using a Roller Bending Machine" Hansen et al, Aug. 1979 vol. 101, from Transactions of the ASME, pp. 304-310.
Kawaguchi Kenji
Yoshida Akio
Crane Daniel C.
Mitsubishi Denki & Kabushiki Kaisha
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