Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1983-11-14
1986-04-08
Husar, Francis S.
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72465, 100258R, B21D 502
Patent
active
045804346
ABSTRACT:
A deflection compensating cylinder and auxiliary cross-member assembly, for use with a press brake of the type having a bed, a ram, and a pair of main cylinders actuating the ram. The assembly causes the die-supporting edges of the bed and ram to remain substantially parallel under load. A pair of auxiliary cross-members are located to each side of the bed, extending the majority of the length thereof. The cross-members are affixed to the bed by a pair of pins, each located near an end of the cross-members and extending therethrough and through the bed. The cross-members have corresponding, coextensive, longitudinal slots formed therein and located centrally thereof. The bed contains a similar slot, slightly offset in a vertical direction with respect to the cross-member slots. A deflection compensating cylinder is mounted in the cross-member and bed slots with the cylinder contacting one of the bed and cross-members and its piston contacting the other of the bed and cross-members. The compensating cylinder has a working area four times that of one of the main cylinders. The compensating cylinder is connected to the same hydraulic source as the main cylinders and is subject to the same pressure so that when the bed and ram are under load against a workpiece, the compensating cylinder will remove the downward deflection from the bed and impart thereto an upward deflection substantially similar to that of the ram. The deflection compensating assembly could be mounted on the ram, instead of the bed, to accomplish the same results.
REFERENCES:
patent: 3550425 (1970-12-01), Cailloux
patent: 3914975 (1975-10-01), Kawano
patent: 4016742 (1977-04-01), Shiokawa
patent: 4098109 (1978-07-01), Cailloux
Cincinnati Incorporated
Husar Francis S.
Jones David B.
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