Patent Application
20150013511
The invention relates to a vertical lathe.
Such a vertical lathe is known from DE 20 2009 008 850 U1 for example. It discloses that a travelling-field motor is used as a motor, whose primary segments forming the stator are positioned in the bottom table and the secondary segments forming the rotor are positioned in the working table.
This vertical lathe has proven to be extraordinarily successful concerning its functionality. However, problems can arise by the heat which is produced during operation of the travelling-field motor, since thermal tensions occur in the involved components such as the working table, which tensions will lastly have an influence on the machining precision.
Since especially large precision parts such as bearing rings and rotors of wind turbines or the like are produced with such a vertical lathe, the uncontrolled increase in heat of the respective carrier components and the resulting disadvantages are especially relevant.
The invention is based on the object of further developing a vertical lathe of the kind mentioned above in such a way that its usefulness is improved.
This object is achieved by a vertical lathe according to the present invention.
In accordance with the invention, the travelling-field motor is in operative connection with a heat-removing heat exchanger, which absorbs the heat produced by the travelling-field motor in operation and dissipates said heat, for which purpose a suitable medium is used.
Since especially the secondary segments of the travelling-field motor which forms the rotor produce heat during operation and said secondary segments are held on the working table, the heat exchanger is also preferably arranged on the working table in direct contact with the secondary segments.
The heat exchanger, in its capacity as a heat sink, is preferably made of a material that conducts heat very well, e.g. aluminium or the like, and is preferably positioned between the secondary segments and the working table.
In order to prevent heat transmission between the heat exchanger and the working table, a preferably plate-like insulation is provided as an intermediate layer.
The heat exchanger can be arranged in such a way that the cooling medium flows about said heat exchanger at least in sections, which cooling medium is held in an annular cooling chamber and can be supplied in a circuit to a separate cooler.
The cooling chamber can be provided in an outer peripheral region of the vertical lathe and is used simultaneously as a liquid seal, by means of which a substantially hermetic sealing of the travelling-field motor is achieved both in the bottom table and also in the working table.
It needs to be mentioned further that the new vertical lathe can be realised with relatively little effort concerning construction and production. It is necessary in this respect that the secondary elements are screwed together with the heat exchanger, wherein they rest on the heat exchanger over the entire surface, which heat exchanger is massively arranged so that optimal heat transmission is provided from the secondary elements to the cooling medium, which preferably consists of a suitable oil.
Further advantageous embodiments of the invention are made apparant by the discussion that follows.
An embodiment of the invention will be described below by reference to the enclosed drawings, wherein:
The travelling-field motor 3 consists in the known manner of primary segments 4 forming a stator and secondary segments 5 forming a rotor. The primary segments 4 are fixedly positioned in the bottom table, whereas the secondary segments 5 are held on the working table 2, wherein the mutually facing effective surfaces of the primary segments 4 and the secondary segments 5 extend in a horizontal plane by forming an air gap.
The travelling-field motor 3 is in operative connection with a heat-removing heat exchanger 6 in accordance with the invention, which heat exchanger is fixed to the working table 2 in the example and on which the secondary segments 5 rest over the entire surface and are fastened thereto by a screwed joint.
The heat exchanger 6 is preferably arranged in an annular fashion and is situated in the peripheral region of the working table 2, as also the travelling-field motor 3.
An insulating layer 11 is provided on the bottom side of the working table 2 which faces away from a workpiece fixture 13 between the heat exchanger 6 and the region of the working table 2 situated above said heat exchanger (
For the purpose of removing the heat from the heat exchanger 6, it comprises a concentrically extending leg 14 which protrudes into a cooling chamber 7 of the bottom table 1 and where a cooling medium flows around said leg 14, which cooling medium is held in the cooling chamber 7 and can be guided into the cooling chamber 7 by way of a circuit via a cooling unit (not shown) and a connected coolant supply 10.
The cooling chamber 7 is a component of a liquid seal 8, which comprises a sealing chamber 15 in addition to the cooling chamber 7, which are both separated by a vertically aligned concentric web 9, wherein the sealing chamber 15 simultaneously forms a discharge for the cooling medium.
In the outermost peripheral region, the rotating working table 2 is sealed in relation to the opposite stationary bottom table 1 by a labyrinth seal 12, so that no dirt will reach the region of the travelling-field motor 3 in correspondence with the liquid seal 8.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202012100266.3 | Jan 2012 | DE | national |
This is a U.S. National Stage of International Patent Application No. PCT/EP2013/051118, filed Jan. 22, 2013, and to German Priority Patent Application No. DE 20 2012 100 266.3, filed Jan. 26, 2012, the entire contents of both of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2013/051118 | 1/22/2013 | WO | 00 |
