EP3544765A1

EP3544765A1 - Mobile cnc machining machine

Info

Publication number: EP3544765A1
Application number: EP17712062.3A
Authority: EP
Inventors: Jannik Lüpfert; Sebastian POTYKA; Stefan Sellmann; Felix Vogt
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2017-01-31
Filing date: 2017-03-15
Publication date: 2019-10-02
Also published as: WO2018141420A1; KR102294080B1; US20190381613A1; KR20190112754A

Abstract

The invention relates to a mobile CNC machining machine (1) which is designed to machine a rotor (2) of a turbomachine, in particular to machine a rotor of a steam turbine, comprising an x-axis, a y-axis and a z-axis which are arranged perpendicular to one another, a baseplate (3), a stator (9) which is arranged on the baseplate (3) and is movable relative to said baseplate along the x-axis, and a tool module (10) which is held on the stator (9) and is movable along the y-axis and along the z-axis and is designed to accommodate a machining tool (11), characterized in that, guided along a circular-arc-shaped convex guide (12) disposed on the stator (9), the tool module (10) 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.

Description

Mobile CNC processing machine

The present invention relates to a mobile CNC machining machine, which is designed for machining a rotor of a Strö ^¬ tion machine, in particular for machining a rotor of a steam turbine, comprising an X-axis, a Y-axis and a Z-axis, respectively perpendicular zuein ^¬ other are arranged, a base plate, arranged one on the base and relatively to this along the X-axis movable stand and a movable held on the stator along the Y axis and along the Z-axis tool ^¬ module which is designed to increase a machining ^{tool ¬} .

Runners of steam turbines of a power plant are exposed to high mechanical and / or thermal loads during operation. Against this background, it is often erforder ^¬ Lich to undergo the runners in the context of maintenance of mechanical processing. Thus, for example, the provided on a rotor for receiving blades grooves are reworked with a milling tool.

Is such a mechanical machining of a rotor, so there is a possibility to expand the runner and to transport to a production hall in which a suitable for carrying out the required machining CNC processing machine is placed stationary. The transportation is very time intensive, which accompanied ^¬ goes with long downtimes of the power plant and correspondingly high costs.

Another possibility is to machine the runner on site in the power plant mechanically. For this purpose, a suitable for carrying out the required machining mobile CNC processing machine of the type mentioned above for

Power station transported and placed there, whereupon ^¬ the developed runner can be edited. Such mobile processing machine is disclosed for example in WO 2013/178377 AI. The CNC machining machine described here comprises a base plate in the form of a modular machine bed, on which a headstock with a headstock chuck, a tailstock with a tailstock chuck, at least two bearing blocks and at least one stand are arranged. The stand is moved along a presently as the X axis of the CNC machine tool described ^¬ Neten axis extending in the longitudinal direction of the machine bed. On the stand a tool ^¬ module is movably held in two mutually perpendicular directions, which in the present case as Y-axis and Z-axis be ^¬ designated. Accordingly, a machining tool received by the tool module can be moved along the X, Y and Z axes. For machining a rotor this is removed and stored on the bearing blocks between the headstock and tailstock so that it can be driven to rotate about a C-axis of the CNC processing machine. Now, the mechanical processing can be done with the machining tool. However, the CNC processing machine described in WO 2013/178377 AI is very bulky and has a high weight, which is in terms of ^{Anschaffungskos ¬} th and transport disadvantageous. In addition, it takes up a lot of space, which is not available in all power plants.

Based on this prior art, it is an object of the present invention to provide a mobile CNC machine of the type mentioned above with an alternative structure.

To achieve this object, the present invention provides a mobile CNC processing machine of the type mentioned above, which is characterized in that the tool module along a arranged on the stator circular arc-shaped convex guide is movable about a C-axis, which is parallel to the X axis. Axis extends such that the Z-axis intersects the C-axis and that the Y-axis extends tangentially to a circular orbit centering on the C-axis. has. In this way, a new machine design will he ^¬ aims, which is distinguished over the known machine designs into ^¬ special in that completely dispensed with headstock and tailstock and a rotationally drivable uptake of the rotor to be machined about a C-axis of the machining ^¬ machine becomes. Instead, can be at the invention CNC machine the ent ^¬ long the X-axis, Y-axis and the Z-axis position movable tool module about the C-axis along the reasonable arranged on the stator circular arc-shaped convex guide. This means that in particular the base plate or the machine bed can be made very small, whereby a comparatively very low weight of erfindungsge ^¬ MAESSEN CNC processing machine can be achieved, which in particular on the transportability and the associated ^¬ costs , Furthermore, the design of the CNC processing machine according to the invention can be very compact, resulting in low acquisition costs. According to one embodiment of the present invention, the base plate has a plurality of leveling devices, that are designed to align the base plate relative to a Un ^¬ tergrund. Accordingly, the inventions ^¬ tion proper CNC processing machine can be easily set up on a variety of surfaces and align based on the substrate and / or on the workpiece to be machined.

Preferably, a base plate under Ver ^¬ application of screws and centering pins is detachably secured, which is provided at its upper side with linear guides for the method of the stator along the X-axis on the base plate. The detachable arrangement is a modular design of the CNC processing ^¬ machine and the associated good portability beneficial. Centering is useful in order not to lose the alignment of the CNC machine tool with multiple Umposi ^¬ tioning. Preferably an intermediate plate is open ^¬ leads on which the stand is attached to the linear guides, wherein the interim ^¬ rule plate particular using fastening bolts ^¬ and centering pins is detachably fastened. The intermediate plate provides the stand with a detachable interface to the moving unit along the X-axis.

A work platform is be advantageous ^¬ solidifies on the intermediate plate, in particular such a cabinet with an integrated switch. In this way, a very compact construction of the CNC processing machine according to the invention is achieved.

According to one embodiment of the present invention, the stator is designed as a cast construction, which is advantageous for the reduction of vibrations.

Preferably, the tool module along the arranged on the stator circular arc-shaped convex guide by a defined angle about the C-axis is movable. For example, at 90 degrees of freedom, a circumferential machining of the rotor would be possible with only three rotations.

Advantageously, the tool module is steplessly lockable in the various win ^¬ kelstellungen. This can be done in particular the processing of Schaufelfußaufnahmenut by the tool module aligned in a first step relative to the C-axis, then locked and finally by Ver ^¬ drive the tool unit along the X, Y and Z axis be ^¬ works.

According to one embodiment of the present invention, in the tool module to a routing module that is added to from ^¬, a milling tool rotating around the Z axis anzutrei ^¬ ben.

Furthermore, the present invention provides a method for the mechanical machining of a rotor of a turbomachine using a CNC machining according to the invention. processing machine of the type described above, the method comprising the steps of: a) jacking the runner to be processed on storage stands; b) constructing the Bearbeitungsma ^¬ machine next to the jacked rotor such that the X-axis of the machine tool extends parallel to the longitudinal axis of the rotor and that the C-axis of the Bearbeitungsma ^¬ machine coincides with the longitudinal axis of the rotor; c) Bear ^¬ working a first circumferential portion of the rotor using the processing machine; d) turning the rotor about its longitudinal axis by a predetermined angle, for example ^¬ with the support of a hall crane; e) processing a further peripheral portion of the rotor using the processing machine; and f) repeating steps d) and e) until the entire circumferential region of the rotor has been processed.

Further features and advantages of the present invention will become apparent from the following description of a mobile CNC processing machine according to an embodiment of the vorlie ^¬ ing invention with reference to the accompanying drawing ^¬ tion. That's it

Figure 1 is a schematic perspective view of a

mobile CNC processing machine according to one ^{embodiment of} the present invention;

Figure 2 is a schematic perspective view of the in

Figure 1 shown CNC processing machine during the machining of a rotor; and

FIG. 3 shows a side view of the arrangement shown in FIG.

The mobile CNC processing machine 1 is used for processing a rotor 2 of a turbomachine, such as a rotor of a steam turbine. It has a modular design, whereby the size of the modules is selected such that the CNC processing machine in disassembled state in conventional can transport freight containers and is accordingly mobile. The CNC machine tool 1 comprises a base ^¬ plate 3 with a plurality of leveling devices 4 which are designed to align the base plate 3 relative to a UN tergrund. 5 On the base plate 3 is a Ba ^¬ sisplatte 6 using screws, not shown, and centering pins is detachably secured, which is comparable to see on their upper side with it in the direction of X-axis of the CNC machine tool 1 extending linear guides. 7 On the linear guides 7, an intermediate plate 8 is guided, on which a stand 9 is fixed, wherein the Zwi ^¬ rule plate 8 is releasably secured using also unspecified Darge ^¬ stellter mounting screws and centering. On the stand 9, a tool module 10 along a Y-axis and along a Z-axis of the CNC machining ^¬ processing machine 1 is held movable. The tool module 10 is presently designed as a milling module and adapted to receive a machining tool 11 in the form of a milling cutter and to drive in rotation about the Z-axis. The movable along the Y and Z axis tool module 10 is held on the stator 9 on a circular arc-shaped convex guide 12 and thus pivotally about a C-axis of the CNC processing machine 1 along a circular line extending parallel to the X-axis and the Z-axis intersects. Accordingly, it means that the Y-axis extends tangentially to a circular path, wel ^¬ che having the C axis as center. The tool module 10 can be steplessly locked in a circle about the C-axis in the various angular positions. Furthermore, the CNC processing machine 1 has a working platform 13 with an integrated control cabinet 14, which in the present case is fastened to the intermediate plate 8 and from which the CNC processing machine 1 can be controlled by an operator.

The X-axis, the Y-axis and the Z-axis are arranged perpendicular to each other. The X-axis is fixed, while the Y-axis and the Z-axis in response to the pivotal position of the tool module 10 about the C-axis variie ^¬ ren. For machining a rotor 2, it is first removed, as shown in FIGS. 2 and 3, and after removal of the rotor blades held on it, it is placed on storage blocks 15. Subsequently, the CNC processing machine 1 is constructed next to the jacked rotor 2 such that the X-axis of the CNC processing machine 1 extends parallel to the longitudinal axis L of the rotor 2 and that the C-axis of the CNC processing machine 1 with the Longitudinal axis L of the rotor 2 coincides. Now, the rotor 2 can be machined over a first circumferential portion 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 done, for example, with the assistance of a hall crane or ^¬ same. Then, the mechanical processing of another circumferential portion of the rotor 2 can join. The last two steps are then repeated until the entire circumferential area has been processed. If further areas are then to be machined, the CNC processing machine can be repositioned in the direction of the X axis, if necessary, in order to process further turbine stages. An essential advantage of the previously described CNC processing machine 1 is that the tool module 10 can be moved about the C axis along the arcuate convex guide 12 arranged on the stand 9. Thus, it is not absolutely necessary to support the rotor 2 in a rotationally driveable manner, which means that in particular the base plate can be made comparatively small. This is associated with a low weight of the CNC machining ^¬ processing machine 1 and with a small space requirement, which in particular has a positive effect on the cost and transportability of the CNC processing machine 1.

Although the invention has been illustrated and described in detail by the preferred embodiment, so ^¬ not limit the invention to the disclosed examples and other variations can be derived therefrom by the skilled artisan without departing from the scope of the invention.

Reference sign list

1 CNC processing machine

2 runners

3 base plate

4 leveling device

5 underground

6 base plate

7 linear guide

8 intermediate plate

9 stands

10 tool module

11 machining tool

12 leadership

13 work platform

14 control cabinet

15 storage rack

L longitudinal axis

Claims

claims

1. Mobile CNC processing machine (1),

which is designed for machining a rotor (2) of a flow ^¬ machine,

in particular for machining a rotor of a steam turbine,

comprising an X-axis, a Y-axis and a Z-axis, which are each arranged perpendicular to each other, a Grund ^¬ plate (3), one on the base plate (3) arranged and movable relative to this along the X-axis stand (9) and to the stand (9) along the Y-axis and along the Z-axis movable held tool module (10) which is adapted to receive a machining tool (11) to increase ^¬,

characterized in that

the tool module (10) is guided along a circular arc-shaped convex guide (12) arranged on the stand (9) and can be moved about a C-axis which extends parallel to the X axis.

Axial extends that the Z-axis intersects the C-axis and that the Y-axis tangential to a circular path he ^¬ stretches, which has the C-axis as the center.

2. CNC processing machine (1) according to claim 1,

characterized in that

the base plate (3) comprises a plurality of leveling means (4) adapted to orient the base plate (3) relative to a base (5).

3. CNC processing machine (1) according to one of the preceding ^¬ the claims,

characterized in that

a base plate (6) is releasably secured on the base plate (3) using screws and centering pins provided on its upper side with linear guides (7) for moving the stator (9) along the X-axis.

4. CNC processing machine (1) according to claim 3,

characterized in that

on the linear guides (7) an intermediate plate (8) is guided, on which the stand (9) is fixed,

wherein the intermediate plate (8) is releasably secured, in particular using fastening screws and centering pins.

5. CNC processing machine (1) according to claim 4,

characterized in that

on the intermediate plate (8) a working platform (13) is fixed, in particular one with integrated switching ^¬ cabinet (14).

6. CNC processing machine (1) according to one of the preceding claims,

characterized in that

the tool module (10) along the on the stand (9) arranged circular arc-shaped convex guide (12) is movable by a defined angle about the C-axis.

7. CNC processing machine (1) according to one of the preceding ^¬ the claims,

characterized in that

the tool module (10) is steplessly lockable in the various angular positions.

8. CNC processing machine (1) according to one of the preceding ^¬ the claims,

characterized in that

If the tool module (10) to a router module han ^¬ delt, which is adapted to rotate about the Z axis to drive a milling tool.

9. A method for machining a rotor of a turbomachine using a CNC machining ^¬ processing machine (1) according to one of the preceding claims, comprising the steps of:

a) jacking up of the rotor to be machined (2) on filing ^¬ blocks (15);

b) establishing the CNC machine tool (1) next to (on ^¬ gebockten rotor 2) such that the X axis of the CNC machine tool (1) (parallel to the longitudinal axis L) of the rotor (2) and that the CNC machining ^¬ coincides C-axis processing machine (1) with the longitudinal axis (L) of the rotor (2);

c) machining a first circumferential portion of the rotor (2) using the CNC processing machine (1); d) turning the rotor (2) about its longitudinal axis (L) by a predetermined angle;

e) machining a further peripheral portion of the rotor (2) using the CNC processing machine (1); and

f) repeating steps d) and e) until the entire area to ^¬ fängliche of the rotor (2) is processed.