Metal deforming – By use of roller or roller-like tool-element – Comprising tool movable relative to stationary work-portion...
Patent
1998-12-29
2000-04-11
Tolan, Ed
Metal deforming
By use of roller or roller-like tool-element
Comprising tool movable relative to stationary work-portion...
72220, 72316, 72322, B21D 702
Patent
active
060475854
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for shaping workpieces that are generally are panels, sheet metal, foil or sheeting, which are disposed in such a manner between two tools, that a part to be shaped is not covered by the tools. After the workpieces are fixed, shaping work, such as bending work, is carried with a third tool.
Apparatuses are known which carry out shaping work (bending work) on workpieces which are clamped between two working panels. The clamping usually is mechanical, for example, by G clamps or cheek plates, which are disposed so that they can be moved hydraulically towards one another. The shaping, which is to be brought about by the bending work, generally is carried out by dies or bottom dies. Likewise, for the shaping of less complex formations, as required for profiles or chamfers, so-called "free bending" is carried out. Free bending, however, permits only a limited degree of complexity. An apparatus for carrying out such a method is known from the German patent 40 09 466. The method described there offers the possibility, after a particular adjustment of the tool, of producing a particular type of corner using a particular sheet metal. The pre-setting of the tool must be taken into consideration already when the tool is manufactured, since later modifications, which may be required for other workpieces (workpiece thickness, edge height, characteristic values of the material), cannot be carried out.
Moreover, this patent discloses an apparatus for bending and profiling corners, a tool for holding down the workpiece being used to lock the workpieces in position. The basic shape of this holding-down device is rectangular, so that it covers completely the region of the corner of the workpiece. However, due to the complete coverage of the corner region, stretching of the material in this region is prevented, so that cracks, which are not acceptable for esthetic as well as safety reasons, can develop in the comer region.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an apparatus for shaping workpieces, which enables the tool geometry to be modified with respect to the workpieces that are to be shaped and permits a reliable, qualitatively high-grade corner profiling.
Pursuant to the invention, this objective is accomplished by providing an hourglass-shaped roller as bending tool. Workpieces in each case are clamped between a first and a second tool, the second tool having a holding-down surface. The invention is characterized in that superimposed vertical side surfaces of the workpiece are offset by a horizontal dimension X, which corresponds at most to five times the thickness of the panel-shaped workpiece, and in that the second workpiece, having the holding-down surface, is inclined and forms a further vertical surface in a region A, in which the panel-shaped workpiece is to be shaped into a corner and in which the tool does not cover the workpiece.
The present invention also provides a that the dimension X, as a distance between the molded edge and the vertical surface, can be adjusted as a function of the thickness and edge height of the workpiece.
According to a feature of the invention, there is further provided that the holding surface of the second tool has a plastic coating or consists of a metallic material and is flat. The plastic coating optionally consists of polyethylene.
The present invention further provides that the end region of the holding surface is inclined in such a manner, that the free edge is at a lesser distance Z from the workpiece.
The present invention is further characterized by a feature that the second tool can be shifted exclusively in the vertical direction.
Since the second tool is equipped with a longitudinal displacement device (hydraulic or pneumatic) and only a displacement in the intended direction is desired, the second tool has a device, which prevents a twisting or displacement of the second tool in a direction, which does not correspond to the intended direction of displacement by the lon
REFERENCES:
patent: 2175679 (1939-10-01), Beatty
patent: 2476596 (1949-07-01), Green
patent: 5765427 (1998-06-01), Codatto
GFI Fertigungstechnik GmbH
Tolan Ed
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