Metal deforming – By relatively movable offset tool-faces – Embodying three or more coacting relatively movable tools
Patent
1981-10-27
1984-05-22
Larson, Lowell A.
Metal deforming
By relatively movable offset tool-faces
Embodying three or more coacting relatively movable tools
72385, B21D 706
Patent
active
044493886
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of bending shaped or corrugated metal sheet, which has alternatingly occurring longitudinal ridges and valleys, the side portions of which also constitute the side portions of the ridges, about an axis, which extends perpendicularly to the longitudinal direction of the ridges and valleys and is in parallel with the plane of the metal sheet. The invention further relates to an apparatus for carrying out the method.
For bending such shaped or corrugated metal sheets, plates, strips and the like of metal about an axis, which extends perpendicularly in relation to the longitudinal direction of the shaping and is in parallel with the plane of the sheet, it is previously known from U.S. Pat. Nos. 4,195,511 and 4,220,031, to form in the corrugations, the tops of which are located closest to said axis, strip-shaped projections in the direction of the axis which project from one and the same side of the sheet. Each such projection extends continuously over at least a portion of the lateral portion and intermediate portion of the respective corrugation, and the projections are given such shape that the sheet is shrunk more closest to the axis than farthest away from it. By this method of bending shaped metal sheet, in the zone of transition between the lateral portions of the corrugation and the intermediate portion an accumulation of material is obtained which renders it impossible to bend shaped metal sheets provided with a surrace-covering coat, without damaging the coat on one side or the other, which can give rise to weakenings in the material at the bending place. It is not possible either, with this known method to bend a shaped sheet to a radius smaller than about 750 mm, which is a substantial limitation of the applicability of the bending method. It further is known to bend shaped metal sheet about an axis, which extends perpendicularly to the longitudinal direction of the shaping and in parallel with the plane of the sheet, according to which method impressions are effected from below in those portions of the corrugations of the sheet which are facing toward said axis. Said impressions are made in subsequent steps until the desired bending angle is achieved. As by this known method a relatively small bending angle, for example 15.degree., is obtained for each bending operation, i.e. for each impression, consequently six subsequent bending operations are required for obtaining a total bending angle of 90.degree..
The present invention, therefore, has the object a.o. to provide a bending method, which can be applied to substantially all existing types of shaped or corrugated metal sheet, and which renders possible the bending of such shaped sheet up to at least 90.degree. in one step or bending moment, and which, besides, shall be careful to the sheet and not weaken it to an appreciable degree at and about the place of bending.
In order to achieve this object, according to the present invention a bending method and an apparatus are proposed, which have been given the characterizing features defined in the attached claims.
The invention is described in the following in greater detail, with reference to the accompanying drawings, in which
FIG. 1 is a lateral view of a bending and pressing frame according to the invention,
FIG. 2 is a section along the line II--II in FIG. 1,
FIG. 3 is a section along the line III--III in FIG. 2 on an enlarged scale,
FIG. 4 is a section along the line IV--IV in FIG. 2 on an enlarged scale,
FIG. 5 is a section along the line V--V in FIG. 3 on an enlarged scale,
FIGS. 6, 6a and 7 show in a schematical way the bending tool according to the invention and together illustrate the principle, on which the method according to the invention is based,
FIG. 8 is an end view of strippers arranged on each side of the pressing frame,
FIG. 9 is a view along the line IX--IX in FIG. 8,
FIG. 10 is a schematic lateral view of a plant provided with the bending frame according to the invention and capable to bend corrugated sheets for pallets,
FIG. 11 is a horizont
REFERENCES:
patent: 3664170 (1972-05-01), Davis
patent: 3838590 (1974-10-01), Van Dijk
patent: 4220031 (1980-09-01), Naslund
Groko Maskin AB
Larson Lowell A.
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