Turning – Lathe – Vertical
Reexamination Certificate
2000-11-21
2003-12-02
Tsai, Henry W. H. (Department: 2183)
Turning
Lathe
Vertical
C082S132000
Reexamination Certificate
active
06655247
ABSTRACT:
The invention relates to a machine tool, in particular for the rotary machining of workpieces.
Machine tools of this type are known, the tool carrier and the workpiece carrier being movable relative to each other in these known machine tools as a result of the fact that they are mounted directly on one or more slides movable in a linear manner relative to the machine frame.
In order to obtain three-dimensional mobility of the tool carrier and the workpiece carrier relative to each other, it is necessary to arrange at least one of the two on a cross slide.
A cross slide of this type has the drawback that in this case substantial masses have to be moved.
The object of the invention is therefore to provide a machine tool in which the moved masses can be kept as low as possible.
This object is attained according to the invention by a machine tool, in particular for the rotary machining of workpieces, in that the machine tool comprises a machine frame, a tool carrier, a workpiece carrier and a parallel kinematic arrangement, which has three parallelogram guides connected in an articulated manner at one end to a receiving means for one of the carriers and at the other end to one of the slides and an N/C-controlled linear drive for each slide and by which the carrier arranged on the receiving means is movable relative to the machine frame in a three-dimensional movement space.
The advantage of the parallel kinematic arrangement according to the invention is that the moved masses can be kept low by means of this, since each slide has to be guided movably only in one axial direction and so all the drives for the slides can be arranged on the machine frame.
In principle it would be sufficient in the case of a machine tool according to the invention for the tool carrier to be equipped with one tool. It is particularly advantageous, however, if the tool carrier can be equipped with a plurality of tools, so that as extensive a complete machining as possible can be performed by the plurality of tools
In principle it would be possible in this case for the tools to be arranged along one direction, for example in a linear manner. It is particularly advantageous, however, for the machine tool according to the invention to be constructed when the plurality of tools are arranged in two directions and mutually spaced in each case, so that a two-dimensional matrix of tools is available.
By means of a two-dimensional matrix a plurality of tools can be arranged in a relatively small space, so that in this way the space requirement of the machine tool in particular is small despite the plurality of tools.
A particularly advantageous solution provides that the plurality of tools can be used for machining a workpiece, so that in this way a time-saving complete machining is made possible by a rapid change from machining with one tool to machining with the other tool.
In principle, in the case of the machine tool according to the invention it would be possible to provide a tool carrier in which the tools are movable relative to the machine frame. A known tool carrier of this type is a tool revolver, which may be a revolver rotatable about a revolver axis or even a linear revolver.
It is particularly advantageous for the solution according to the invention, however, in particular on account of the existing three-dimensional mobility of the receiving means, if the tool carrier is arranged stationary on the machine frame and, in particular, the tools used are arranged with such an orientation that they can be used for machining by bringing the workpiece to the tool, so that in this case exclusively the workpiece carrier is movable relative to the machine frame by means of the receiving means.
In order to ensure an optimum chip clearance it is preferably provided that chip spaces, by way of which the chips produced can be removed, are arranged between the tools.
It is particularly advantageous in this case if the tool carrier has an aperture for the removal of chips which drop down, so that these chips can be removed in a simple manner.
In this case a particularly expedient arrangement in the case of a plurality of tools provides that the tools are arranged around the aperture.
In addition, in order to obtain an expedient removal of the chips by way of the machine frame, it is preferably provided that the tool carrier is arranged in the machine frame above a recess which receives falling chips.
With respect to the arrangement of the receiving means relative to the parallel kinematic arrangement used according to the invention, more precise details have not been provided hitherto. For example, the parallel kinematic arrangement could be designed in such a way that the receiving means is supported by the parallel kinematic arrangement with respect to the machine frame, i.e. the receiving means stresses the parallelogram guides essentially with pressure.
In the case of a workpiece receiving means with a tool arranged in a suspended manner, however, this would have the disadvantage that in this case the parallelogram guides would extend on the same side as the workpiece and would restrict the operating space.
For this reason a particularly advantageous embodiment provides that the receiving means is arranged in a suspended manner on the parallelogram guides and so the latter are stressed by tension. The parallelogram guides are thus situated in a region in which they do not restrict the accessibility to the operating space and also not the operating space itself.
With respect to the workpiece receiving means it would be possible to arrange them in such a way that the workpiece rests thereon. It is particularly expedient, however, if the workpiece receiving means receives the workpiece in a suspended manner.
With respect to the design of the workpiece receiving means, no more precise details have been given in conjunction with the previous explanation of the individual embodiments. In this way, it would be possible, for example, to use a driven tool for machining a workpiece, so that it would be sufficient to use the workpiece carrier only for positioning the workpiece relative to the driven tool.
A particularly advantageous solution, however, in particular with respect to rotary machining, provides that the workpiece carrier is a workpiece spindle.
For example, in the case of the solution according to the invention the workpiece spindle could be arranged as before on the machine frame and the workpiece could be machinable by arranging the workpiece carrier on the receiving means.
It is particularly expedient, however, particularly in order to be able to integrate a workpiece manipulation in a simple manner without additional manipulation devices, if the workpiece spindle is arranged on the receiving means, so that the workpiece spindle is movable in the movement space provided for the receiving means.
To this end, it is preferably provided that the workpiece spindle is movable in the movement space in such a way that all the tools of the tool carrier can be used on the workpiece.
In this case the workpiece spindle is advantageously designed in the form of a suspended spindle, i.e. the workpiece spindle is arranged on the receiving means in such a way that the workpiece receiving means points in the direction of a base area of the machine tool.
It is particularly expedient if the workpiece spindle is a vertical spindle, i.e. the spindle axis is designed in such a way that it extends substantially parallel to the vertical. With a vertical spindle of this type, gripping and/or depositing a workpiece can advantageously be combined with machining, particularly in the case of small parts. In this way, for example, in particular the three-dimensional mobility of the workpiece spindle can be utilized expediently in order to grip and/or to machine a workpiece available on a conveying device and subsequently to deposit it again.
In addition to the movable workpiece spindle, however, the concept according to the invention can also advantageously provide a counter spindle which is arranged adjacent to the tools on the machi
Haberkern Anton
Hafla Dietmar
Link Helmut
Walker Bernd
Index-Werke GmbH & Co. & KG Hahn & Tessky
Leydig , Voit & Mayer, Ltd.
Tsai Henry W. H.
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