Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Reexamination Certificate
2000-09-19
2001-12-04
Crane, Daniel C. (Department: 3725)
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
Reexamination Certificate
active
06324882
ABSTRACT:
This application is a continuation of International application number PCT/EP00/00126 filed on Jan. 11, 2000.
The invention relates to a bending machine for flat material, comprising a machine frame, a lower beam arranged on the machine frame and having a lower clamping tool and an upper beam arranged on the machine frame and having an upper clamping tool, with which the flat material can be fixed in a clamping plane, a bending tool moving device which is associated with one of the beams and with which a bending tool carrier with a bending tool can be moved into a plurality of bending positions for bending the flat material about a bending edge relative to the clamping plane.
A machine of this type is known from the state of the art, for example, DE 42 06 417. With this machine, there is the problem, on the one hand, of the pivoting of a bending beam bearing the bending tool being constructionally complicated, in particular, when the bending is intended to be carried out as precisely as possible.
The object underlying the invention is therefore to improve a bending machine of the generic type in such a manner that the movements of the bending tool can be realized technically with simple means and precise bending movements of the bending tool can be carried out.
This object is accomplished in accordance with the invention, in a bending machine of the type described at the outset, in that the bending tool has a bending nose with a curved pressure surface for acting upon one side of the flat material and that the bending tool can be moved by the bending tool moving device between a starting bending position and an end bending position on a path about the respective bending edge which is predetermined in a defined manner such that the curved pressure surface and the side of the flat material acted upon move relative to one another in the form of an essentially slide-free rolling on one another.
The advantage of the inventive solution is to be seen in the fact that as a result of the use of a curved pressure surface and the rolling of the curved pressure surface on the side of the flat material acted upon bending operations which are gentle for the flat material can be realized, on the one hand, with movements of the bending tool which can be carried out in a technically simple manner.
The advantage of the inventive solution is to be seen, in particular, in the fact that no sliding of the bending tool relative to the flat material essentially takes place, wherein the movement of the bending tool required for this purpose can be brought about in a constructionally simple manner.
In principle, it would be conceivable to move the bending tool on the path provided for the inventive solution, for example, by means of numerical path controls. Such a solution does, however, have the disadvantage that large forces have to be generated and controlled exactly for the movement of the bending tool.
For this reason, it is preferably provided for the path of the bending tool to be predetermined in a defined manner by a mechanical path guide means so that no precise path control of the bending tool with the aid of large forces is necessary but merely a driving of the bending tool in such a manner that it follows the path guide means.
The path guide means may be realized in the most varied of ways. For example, it would be conceivable to provide a connecting link path for this purpose which is followed by a path follower. Such a connecting link path is, on the one hand, complicated to produce and, on the other hand, entails a considerable constructional size.
For this reason, one advantageous embodiment provides for the path of the bending tool to be predetermined by at least one pivoting movement. A pivoting movement has the great advantage that this may be realized in a simple manner suitable even for large forces and, in particular, is liable to fewer appearances of wear and tear than a guide means by means of a connecting link path, in a simple manner and without considerable mechanical resources.
The inventive path may be realized particularly favorably when the path of the bending tool is predetermined by way of superposition of at least two pivoting movements, wherein reference is made to the comments made above with respect to the advantage of the pivoting movements in comparison with connecting link guide means.
No further details have so far been given concerning the design and alignment of the bending nose.
One advantageous embodiment, for example, provides for the bending nose to face at least one of the clamping tools with a bending nose tip in all the bending positions, wherein with such an alignment of the bending nose only simple movements thereof are necessary in order to bend the flat material in an inventive manner.
The way, in which the curved pressure surface and the side of the flat material acted upon by the tool are intended to move relative to one another, has not been specified in detail in conjunction with the preceding explanations concerning the invention. It would, for example, be conceivable to configure the rolling along such that a contact line between the pressure surface and the side of the flat material acted upon migrates away from the bending edge.
The movement of the inventive bending nose may be realized particularly favorably when a contact line between the pressure surface and the side of the flat material acted upon moves in the direction of the bending edge on the side of the flat material acted upon during the pass through the bending positions from the starting bending position to the end bending position. This solution has the great advantage that, in relation to the clamping tools, no pivoting of the bending nose itself through large pivoting angles is required in order to fulfill the inventive condition of the essentially slide-free rolling on the side of the flat material acted upon.
With respect to the design of the pressure surface itself, no further details have so far been given. One advantageous embodiment, for example, provides for the pressure surface to have an apex line located closest to the respective clamping tool in the starting bending position and to extend away from the clamping tool proceeding from this apex line. Such a design of the pressure surface of the bending nose likewise offers a simple possibility for being able to carry out the bending of the flat material precisely with movements of the bending tool which are as simple as possible.
A particularly advantageous design of the pressure surface provides for this to have a front pressure surface section which is located so as to face away from the bending tool carrier and extends away from the apex line. Such a type of pressure surface is suitable, in particular, for carrying out bendings of the flat material through angles of up to 90°. It is even more advantageous when the pressure surface has a rear pressure surface section which faces the bending tool carrier and, located opposite the front pressure surface section, extends away from the apex line. Such a design of the pressure surface has the advantage that, in particular, large bending angles, in particular, bending angles of more than 90° can also be realized with a simple movement of the bending tool.
Within the scope of the inventive solution, it is preferably provided for the contact line between the pressure surface and the side of the flat material acted upon to be located in the area of the front pressure surface section in the starting bending position and to move in the direction of the apex line during bending.
In this respect, it is particularly favorable when the bending nose is movable into such an end bending position, in which the contact line is located in the area of the rear pressure surface section so that as large a pressure surface as possible can be utilized during the bending procedure and a bending of the flat material through more than 90° can be carried out, in particular, with simple movement kinematics.
With respect to the arrangement of the bending tool moving device, no further details hav
Kutschker Wolfgang
Pesold Erwin
Crane Daniel C.
Lipsitz Barry R.
Reinhardt Maschinenbau GmbH
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