Turning – Lathe – With tool turret
Reexamination Certificate
2001-08-08
2003-09-23
Fridie, Jr., Willmon (Department: 3722)
Turning
Lathe
With tool turret
C082S129000
Reexamination Certificate
active
06622600
ABSTRACT:
The present disclosure relates to the subject matter disclosed in German Application No. 100 40 224.0 of Aug. 17, 2000, the entire specification of which is incorporated herein by reference.
The invention relates to a machine tool comprising a machine frame, a first work piece spindle disposed on the machine frame with a first work piece receiving means rotatable around a first spindle axis, a second work piece spindle disposed on the machine frame with a second work piece receiving means rotatable around a second spindle axis, said second spindle being arranged to face the first work piece receiving means, whereby the second work piece spindle is movable in relation to the machine frame in a Z direction parallel to the first spindle axis and an X direction transverse to the first spindle axis, a first tool carriage disposed on the machine frame on one side of the first spindle axis and movable at least in the X direction, its position controlled by a machine control, said first tool carriage having a first tool carrier disposed thereon, in which first tools are disposed.
Such a machine tool is known from the prior art: with this machine tool the ability of the second work piece spindle to move in X direction transversely to the first spindle axis is utilized to conduct a machining operation on the reverse side in the second work piece spindle with an additional tool carrier so that a machining operation can be conducted on the front side with a work piece held in the first work piece receiving means, whereby sufficient space is available for said operation and, in addition, the work piece held in the first work piece receiving means can be supported, for example, by means of a tailstock.
The disadvantage of this solution is that optimum utilization of the machining possibilities cannot be achieved thereby.
Therefore, the object forming the basis of the invention is to improve a machine tool, in particular a lathe, of said type in such a way that an optimized work piece machining operation is possible with respect to the support sides.
This object is achieved according to the invention with a machine tool of the type described above in that at least one further tool is provided on the first tool carriage, that in order to conduct a machining operation of a work piece held in the second work piece receiving means with one of the first tools with the at least one further tool simultaneously with a machining operation of a work piece held in the first work piece receiving means, the second work piece spindle is movable, its position controlled by means of a machine control, and consequently may follow the movement of the first tool carriage with a constant relative position, and in addition is movable relative to the first tool carriage in accordance with the provided machining operation of the work piece held in the second work piece receiving means.
Therefore, the advantage of the solution according to the invention is that this permits a simultaneous machining operation of a work piece in the first work piece receiving means and a work piece in the second work piece receiving means, this being made possible by the first tool carrier and the further tool, both of which, however, are located on a joint tool carriage, and the necessary additional axial movement being achieved by appropriate control of the movement of the second work piece spindle, which must still be movable to be able to remove the work piece from the first work piece receiving means of the first work piece spindle for a machining operation on the reverse side with its second work piece receiving means.
This means that according to the invention a still present movability of the second work piece spindle may be utilized in order to simultaneously conduct a machining operation of a work piece on the first side and another work piece on the second side without further tool carriages, so that low production times result thereby with simple construction.
In order to obtain sufficient space for the machining of the work piece held in the second work piece receiving means in relation to the work piece held in the first work piece receiving means, it is preferably provided that the further tool occupying a working position is displaced towards the second work piece receiving means in relation to the first tool occupying a working position so that collisions between the work pieces themselves or the work pieces and a tool provided for the other work piece may be prevented.
A particularly preferred solution provides that a further tool carrier for the at least one further tool is disposed on the first tool carriage, which thus enables a sufficiently large distance to be created between the tools of the first tool carriage and the at least one further tool.
In addition, the tool carrier provides the possibility of moving the further tool into a working position or out of the working position so that further flexibility is obtained as a result.
No further details have been provided with respect to the arrangement of the first tool carrier and the further tool carrier in relation to one another in association with the explanation of the individual embodiments so far. Thus, it is particularly expedient if the further tool carrier is disposed on a side of the first tool carrier facing away from the first work piece spindle in order to have the further tools in a suitable position for a machining operation of a work piece held in the second work piece receiving means, while at the same time the first tools are available in a suitable position for a machining reformat operation of the work piece held in the first tool receiving means.
It is particularly favorable thereby if several further tools are provided which in a working position face the second work piece receiving means, while the first tools in a working position face the first work piece receiving means.
It would be fundamentally conceivable in the framework of the solution according to the invention to construct the first tool carriages to be movable only in X direction and to perform the Z movement necessary for the machining of the work piece in the first work piece receiving means by an ability of the first work piece spindle to move in Z direction, e.g. by a carriage.
However, a particularly expedient solution structurally provides that in addition to the X direction the first tool carriage is movable in a Z direction parallel to the first spindle axis in a manner controlled by the machine control.
No further details have been given so far with respect to the type of arrangement of the tools of the first tool carrier and of the further tool carrier in relation to one another relative to an X direction running transversely to the first spindle axis.
Thus, alternatively or in addition to the solution of the set problem described above, the object according to the invention is also achieved with a machine tool of the type described above in that the first tool carriage is provided with a further tool carrier, and that on the further tool carrier the further tool occupying a working position is at a greater distance from the first spindle axis in all positions of the first tool carriage than the first tool of the first tool carrier occupying a working position.
This solution has the great advantage that as a result of this changed positioning of the tool respectively occupying a working position, it was possible to conduct the machining of the work piece held in the second work piece receiving means with the further tool occupying a working position in a direction transverse to the first spindle axis, preferably displaced in X direction in relation to the machining of the work piece held in the first work piece receiving means.
It is particularly favorable thereby if the distance of the further tool occupying a working position from the first spindle axis is greater than the distance of the first tool occupying a working position from the first spindle axis by more than a maximum possible work piece diameter.
It is even better if this distance of the further tool oc
Fridie Jr. Willmon
Index-Werke GmbH & Co. & KG Hahn & Tessky
Lipsitz Barry R.
McAllister Douglas M.
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