Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Plural or complex apparatus
Patent
1997-03-26
1998-06-16
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Plural or complex apparatus
72313, 72386, 72322, B21D 504
Patent
active
057654271
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP95/02794, filed Jul. 17, 1995. The present invention relates to a bending press for sheet metal and has been designed for application in the bending of very thick sheet metal, for example 5-10 mm thick, but is not limited to this application.
The principle object of the invention is to produce a versatile bending press of simple design that can carry out bends in one direction or the other, as desired, relative to a plane in which the sheet lies, and that can carry out these bends at any angle within a range from 0.degree. to 90.degree..
By virtue of this solution to the problem, the press can be selectively set in order to bend the sheet in one direction or the other simply by relatively displacing the tool holders, in the direction of introduction of the sheet, from one working position to the other. The angle of bending can be set simply by adjusting the relative working stroke of the tool holders in the direction normal to the plane in which the sheet lies.
The invention will be understood more clearly from the detailed description which follows of a preferred embodiment of the bending press, which description is given with reference to the appended drawings which are provided by way of nonlimiting example and in which:
FIG. 1 is a perspective view of the press,
FIG. 2 is a side view thereof on a larger scale and in partial cross-section,
FIGS. 3a, 3b, 3c, 3d, 3e and 3f are side views on a reduced scale showing successive stages in a so-called "negative" bending operation, and
FIGS. 4a, 4b, 4c, 4d, 4e and 4f are views similar to the preceding ones, showing successive stages in a so-called "positive" bending operation.
With reference to FIG. 1, a bending press according to the invention is indicated overall by the reference numeral 10.
The press 10 is associated with a table 12 that feeds the sheets to said press.
The table 12 has a horizontal upper support surface 14 of the known type with balls 16. The upper surface 14 is divided up into various parts by longitudinal channels 18 and by a transverse channel 20.
Pushers 22 can move backwards and forwards within the longitudinal channels 18, in the direction of the double arrows X, so as horizontally to feed a sheet to be bent into the press 10 and correctly position it in the place where the bend is to be carried out.
The double arrows X also conventionally indicate the direction of introduction of the sheet to be bent in the press, details of which direction will be discussed below.
Abutment elements 24, that serve to centre the sheets transversely with respect to the press 10, can move towards one another and back again in the transverse channels. The direction of movement of the abutment elements 24 is indicated by the double arrows Y, which also conventionally indicate the direction parallel to the bends to be carried out by the press 10. Details of the direction Y will also be discussed below.
The directions X and Y also define a horizontal plane in which the sheet to be bent lies.
Still with reference to FIG. 1, the press 10 comprises a sturdy base 26 on which a first immovable lower tool holder 28a is fixed, which will be described in detail when referring to FIG. 2.
The base 26 carries a slide in the form of clevis pads 30 that slide on the base 26 in the direction X of introduction of the sheet in the press. This direction X is again indicated by a double arrow. Associated with each clevis 30 are means for controlling its movements backwards and forwards in the direction X. Preferably, these control means take the form of hydraulic jacks 32, as illustrated.
A sturdy frame 34 is hinged about horizontal pins 35, which are parallel to the transverse direction Y, in the clevis pads 30 constituting the slide.
Control means, preferably in the form of hydraulic jacks 36, are interposed between the slide 30 and the frame 34.
A sturdy transverse plate 38 is fixed on that side of the frame 34 which faces the table 12 and is opposite the side with the pins 35. On its lower side the plate 38 carries a second movable upper
REFERENCES:
patent: 3407850 (1968-10-01), Kelm
patent: 4043165 (1977-08-01), Badger
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