MOBILE CNC MACHINING MACHINE

Abstract

Provided is a mobile CNC machining machine which is designed to machine a rotor of a turbomachine, wherein the turbomachine is a rotor of a steam turbine, including an x-axis, a y-axis and a z-axis which are arranged perpendicular to one another, a baseplate, a stator which is arranged on the baseplate and is movable relative to the baseplate along the x-axis, and a tool module which is held on the stator and is movable along the y-axis and along the z-axis and is designed to accommodate a machining tool wherein, guided along a circular-arc-shaped convex guide disposed on the stator, the tool module is movable about a c-axis which extends parallel to the x-axis; in that the z-axis intersects the c-axis; and in that the y-axis extends tangentially to a circular path, of which the c-axis is the center point.

Claims

1. A mobile CNC machine tool designed to machine a rotor of a continuous-flow machine, wherein the continuous flow machine is a rotor of a steam turbine, comprising an X axis, a Y axis, and a Z axis which are each arranged at right angles to one another, a bottom plate, a stand arranged on the bottom plate and capable of being displaced relative to the latter along the X axis, and a tool module which is held on the stand so that it can be displaced along the Y axis and along the Z axis and is designed for receiving a machining tool, wherein the tool module is guided on a convex guide in the shape of an arc of a circle arranged on the stand, and can be displaced about a C axis which extends parallel to the X axis, in that the Z axis intersects the C axis, and in that the Y axis extends tangentially to a circular path which has the C axis as a center point.

2. The CNC machine tool as claimed in claim 1, wherein the bottom plate has a plurality of leveling devices which are designed for orienting the bottom plate relative to a subsurface.

3. The CNC machine tool as claimed in claim 1, wherein a baseplate is fastened removably to the bottom plate using screws and centering pins, the baseplate being provided on its upper surface with linear guides for the displacement of the stand along the X axis.

4. The CNC machine tool as claimed in claim 3, wherein an intermediate plate on which the stand is fastened is guided on the linear guides, wherein the intermediate plate is fastened removably in particular using fastening screws and centering pins.

5. The CNC machine tool as claimed in claim 4, wherein a working platform, having an integrated switch cabinet, is fastened on the intermediate plate.

6. The CNC machine tool as claimed claim 1, wherein the tool module can be displaced along the convex guide in the shape of an arc of a circle which is arranged on the stand, by a defined angle about the C axis.

7. The CNC machine tool as claimed in claim 1, wherein the tool module can be locked steplessly in the different angular positions.

8. The CNC machine tool as claimed in claim 1, wherein the tool module is a milling module which is designed to drive a milling tool in rotation about the Z axis.

9. A method for mechanically machining a rotor of a continuous-flow machine using a CNC machine tool as claimed in claim 1, which has the steps: a) jacking the rotor to be machined up on support blocks; b) constructing the CNC machine tool next to the jacked-up rotor in such a way that the X axis of the CNC machine tool extends parallel to the longitudinal axis of the rotor, and that the C axis of the CNC machine tool coincides with the longitudinal axis of the rotor; c) machining a first peripheral part region of the rotor using the CNC machine tool; d) rotating the rotor about its longitudinal axis by a predetermined angle; e) machining a further peripheral part region of the rotor using the CNC machine tool; and f) repeating steps d) and e) until the whole peripheral region of the rotor has been machined.

Description

BRIEF DESCRIPTION

[0017] Some of the embodiments will be described in detail, with references to the following Figures, wherein like designations denote like members, wherein:

[0018] FIG. 1 is a schematic perspective view of a mobile CNC machine tool according to embodiments of the present invention;

[0019] FIG. 2 is a schematic perspective view of the CNC machine tool shown in FIG. 1 during the machining of a rotor; and

[0020] FIG. 3 is a side view of the arrangement shown in FIG. 2.

DETAILED DESCRIPTION

[0021] The mobile CNC machine tool 1 serves to machine a rotor 2 of a continuous-flow machine, such as, for example, a rotor of a steam turbine. It has a modular structure, the size of the modules being chosen such that, in the disassembled state, the CNC machine tool can be transported in conventional freight containers and is accordingly mobile. The CNC machine tool 1 comprises a bottom plate 3 with a plurality of leveling devices 4 which are designed for orienting the bottom plate 3 relative to a subsurface 5. A baseplate 6, which is provided on its top side with linear guides 7 extending in the direction of an X axis of the CNC machine tool 1, is fastened removably to the bottom plate 3 using screws and centering pins (not shown in detail). An intermediate plate 8, on which a stand 9 is fastened, is guided on the linear guides 7, wherein the intermediate plate 8 is fastened removably using fastening screws and centering pins (likewise not shown in detail). A tool module 10 is held on the stand 9 so that it can be displaced along a Y axis and along a Z axis of the CNC machine tool 1. In the present case, the tool module 10 is designed as a milling module and designed for receiving a machining tool 11 in the form of a milling cutter and driving it in rotation about the Z axis. The tool module 10 which can be displaced along the Y and Z axes is held on the stand 9 on a convex guide 12 in the shape of an arc of a circle and can thus be displaced, in pivoting fashion about a C axis of the CNC machine tool 1, along a circular line which extends parallel to the X axis and intersects with the Z axis. The Y axis correspondingly extends tangentially to a circular path which has the C axis as its center point. The tool module 10 can be locked steplessly in the shape of a circular line about the C axis in the different angular positions. The CNC machine tool 1 moreover has a working platform 13 with an integrated switch cabinet 14 which, in the present case, is fastened on the intermediate plate 8 and from which the CNC machine tool 1 can be controlled by an operator.

[0022] The X axis, the Y axis, and the Z axis are each arranged at right angles to one another. The X axis is here fixed, whilst the Y axis and the Z axis vary depending on the pivoted position of the tool module 10 about the C axis.

[0023] In order to machine a rotor 2, as shown in FIGS. 2 and 3, the latter is first disassembled and, after the rotor blades held on it have been removed, arranged on support blocks 15. The CNC machine tool 1 is then constructed next to the jacked-up rotor 2 in such a way that the X axis of the CNC machine tool 1 extends parallel to the longitudinal axis L of the rotor 2, and that the C axis of the CNC machine tool 1 coincides with the longitudinal axis L of the rotor 2. The rotor 2 can then be mechanically machined over a first peripheral part region using the machining tool 11. In a further step, the rotor 2 is rotated on the support blocks 15 by a predetermined angle about its longitudinal axis L, which can be effected, for example, with the assistance of an indoor crane or the like. The mechanical machining of a further peripheral part region of the rotor 2 then follows. The last two steps are then repeated until the whole peripheral region has been machined. If further regions are then required to be machined, the CNC machine tool can be repositioned in the direction of the X axis if this is necessary for machining further turbine stages.

[0024] An essential advantage of the above-described CNC machine tool 1 consists in the fact that the tool module 10 can be displaced about the C axis along the convex guide 12 in the shape of an arc of a circle arranged on the stand 10. It is thus not absolutely necessary to mount the rotor so that it can be driven in rotation, which means that in particular the bottom plate can be relatively small in design. This entails a low dead weight of the CNC machine tool 1 and a small space requirement, which in particular has a positive influence on the acquisition costs and the transportability of the CNC machine tool 1.

[0025] Although the invention has been illustrated and described in greater detail with reference to the preferred exemplary embodiment, the invention is not limited to the examples disclosed, and further variations can be inferred by a person skilled in the art, without departing from the scope of protection of the invention.

[0026] For the sake of clarity, it is to be understood that the use of a or an throughout this application does not exclude a plurality, and comprising does not exclude other steps or elements.

LIST OF REFERENCE SYMBOLS

[0027] 1 CNC machine tool

[0028] 2 rotor

[0029] 3 bottom plate

[0030] 4 leveling device

[0031] 5 subsurface

[0032] 6 baseplate

[0033] 7 linear guide

[0034] 8 intermediate plate

[0035] 9 stand

[0036] 10 tool module

[0037] 11 machining tool

[0038] 12 guide

[0039] 13 working platform

[0040] 14 switch cabinet

[0041] 15 support block

[0042] L longitudinal axis