EP3624987A1

EP3624987A1 - Method and device for machining a component by removing material

Info

Publication number: EP3624987A1
Application number: EP18733796.9A
Authority: EP
Inventors: Michael Clossen-Von Lanken Schulz; Stefan Obermayr
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2017-07-12
Filing date: 2018-06-06
Publication date: 2020-03-25
Also published as: KR20200028420A; AU2018300549C1; DE102017211904A1; WO2019011535A1; US20210146456A1; AU2018300549A1; AU2018300549B2

Abstract

The invention relates to a method for machining a component (2) by removing material, in particular by removing chips, in particular within a groove (1) provided in the component, in which method: spatially resolved measurement data, which comprise information about faults, in particular cracks in the component (2), are provided, and machining of the component (2) by removing material, in particular by removing chips, is performed by means of at least one machining tool (7) mounted for movement in a motorized manner, in particular for translation and/or pivoting in a motorized manner, and is controlled in accordance with the provided measurement data preferably in an automated manner with respect to the positions on the component (2) at which the at least one machining tool (7) is brought into engagement with the component (2) in order to remove material in the region of faults that are present, and in particular is controlled in accordance with the provided measurement data preferably in an automated manner with respect to how deep the at least one machining tool (7) is driven into the component (2). The invention further relates to a device for machining a component (2) by removing material, in particular by removing chips, in particular within a groove (1) provided in the component (2).

Description

Method for carrying out a device and for removing material from a component

The invention relates to a method for carrying out a device and a device for material-removing, in particular machining a component, in particular within a groove provided in the component. Particularly in the turbine sector, components are subject to high mechanical, chemical and thermal stresses, which can be associated with wear and destruction. In the area of the blade root receiving grooves formed on the rotor, for example, in which the rotor blades are held in the turbine, cracks occur due to the stress, which can greatly reduce the service life of the turbine rotor.

If there are cracks or other defects in the area of the blade root grooves on a rotor which are detectable by means of non-destructive testing of components, such as an eddy-current or magnetic powder crack test, these must be removed. For this purpose, in particular cutting machining tools are used according to the prior art.

DE 10 2015 222 529 A1, for example, discloses a milling device which comprises an elongate base body, adapted in its cross section to the cross section of a blade foot receiving groove to be machined, on which a milling tool is held. The shape-adapted base body can be inserted into a Schaufelfußaufnahmenut for processing and moved with slight play through them. The milling tool, which is in particular a milling finger, is held rotatably on the base body about a tool rotation axis. Specifically, the tool is arranged in a recess provided in the lower region of the main body, which recess is provided by a through-groove oriented perpendicular to its longitudinal extent. within half of the receptacle, the tool is held so pivotable about a pivot axis extending perpendicular to the tool axis of rotation, that the tool between a position in which it is completely received in the recess, and a position in which its tip and a predetermined amount away can be moved from the main body protrudes. For a machining of the rotor in the area of a Schaufelfußaufnahmenut the main body is inserted into the groove and inserted slightly into it. The milling tool is pivoted by its pivot axis so that it protrudes outwardly from the recess, wherein the desired degree of projecting, which corresponds to the depth of penetration of the tool into the component to be machined and thus the amount of removed material is set manually. The milling tool is then rotated at its tool axis of rotation and a feed movement of the tool is realized by the

Body is moved by a user by hand through the Schaufelfußaufnahmenut to be processed. As a result, a milled groove is formed along the blade root receiving groove with a constant cross section over its longitudinal extent.

The known milling device has been reinforced in principle to remove defects, in particular cracks in components, especially rotors in the area of Schaufelfußaufnahmenuten. With this, however, comparatively much material, in each case removed over the entire longitudinal extent of a Schaufelfußaufnahmenut. Depending on the component geometry, at least in some sections there is little material available anyway, so that a comparatively large material removal may prove less advantageous.

It is therefore an object of the present invention to provide a method and a device for material-removing, in particular machining a component, which distinguishes a reliable removal of defects in a component with respect to the prior art reduced material removal. At the same time, with the device and The process, in particular machining contour to be produced, which can be calculated and in turn can be examined by a method for non-destructive testing. This object is achieved by a method for carrying out a material-removing, in particular machining, a component, in particular within a groove provided in the component, in which spatially resolved measurement data which contains information about defects, in particular cracks in the component, are provided, and a material-removing, in particular machining of the component with at least one motorized movable, in particular moved motorized and / or pivotally mounted machining tool and is preferably controlled automatically depending on the measurement data provided, at which positions on the component, the at least one machining tool for material removal in the area existing errors are brought into engagement with the component, and in particular is preferably automatically controlled as a function of the measurement data provided, how deep the at least one machining tool penetrates into the component is driven.

In other words, the basic idea of the present invention is to use location-dependent measurement data on defects present in a component, such as cracks for targeted mechanical removal for minimizing the material removed, for defect removal. According to the invention, a fault-finding-dependent control of at least one material-removing tool is carried out for the removal according to findings of existing faults. Specifically, according to the invention, it is preferably automatically controlled as a function of the spatially resolved measurement data on component defects at which positions on a component to be machined at least one machining tool for material removal is engaged and in particular how deep the machining tool is driven into the component. For this purpose, the measured data are preferably read into a control device connected to the at least one machining tool, and the control device controls the at least one machining tool as a function of this. The orientation of the at least one tool is preferred while it varies along the component to be machined by the control device, depending on where specific errors are present. For example, if there is an edit to remove

Errors, in particular cracks in the region of a groove, in particular Schaufelfußaufnahmenut, according to the invention on the basis of provided measurement data on existing errors, for example on the basis of eddy current data, the processing depth in particular in the longitudinal direction of the groove in a turbine blade so in the axial direction varies and indeed in Dependency of existing errors.

Since, according to the invention, a motorized machining tool is used, the position of which is motorized in order to vary the machining depth according to the actual fault finding - and not by hand - a calculable machining contour is obtained. A working contour calculated, for example, using the finite element method can be used for lifetime analysis.

In a preferred embodiment of the method according to the invention, it is provided that a base body on which the at least one machining tool is held motorized, in particular motorized moved and / or pivoted, preferably manually along the component method, and depending on the provided measurement data preferred It is automatically controlled at which positions on the component the at least one machining tool is moved relative to the base body in such a way that it engages with the component for material removal and in particular how deep it is driven. Furthermore, it can be provided that a material-removing machining takes place within a groove, in particular within a blade root receiving groove of a turbomachine and preferably measurement data are provided which comprise spatially resolved information about defects, in particular cracks in the component in the region of the groove, at least with respect to the longitudinal extension direction of the groove , And the main body in the longitudinal direction of the groove method.

If processing takes place in the region of a groove, in particular a blade root receiving groove, the base body used is preferably characterized by a cross section which is adapted to the cross section of the groove, in particular the blade root receiving groove, as is evident from DE 10 2015 222 529 A1.

In this case, it can be provided, in particular, that the at least one machining tool is pivotably supported on the base body about at least one pivot axis, and in particular is controlled as a function of the measurement data provided, at which positions on the component and to what extent, in particular at what angle the at least one Machining tool is pivoted.

Alternatively or additionally, it can be provided that the at least machining tool on the base body along at least one particular linear travel path

is kept movable, and in particular is controlled depending on the provided measurement data, at which positions on the component and to what extent the at least one machining tool is moved along the trajectory. The at least one tool is held in particular adjustable in height on the base body.

As regards the preparation of the measurement data which are provided according to the invention for the preferably automated control of the machining tool, it can be provided that that these are detected by means of one or more probes, which are held together with the at least one processing tool on the base body. Accordingly, a further embodiment of the method according to the invention is also characterized in that a base body is moved along the component, on which at least one test probe for non-destructive testing of the component is held, and measurement data are recorded using the at least one test probe held on the base body which provide spatially resolved information about faults, in particular cracks in the component, and the acquired measurement data for the control of the at least one processing tool held on the base body. In this case, while the base body is being moved along the component to be machined, both the measurement data acquisition and the material removal take place virtually in one step. Then the test probe or preferably the test probes are preferably arranged on the base body such that in a method of the base body along a predetermined direction of travel first a non-destructive examination of the component by means of at least one test probe and followed by a mechanical processing with the at least one machining tool , Of course, it is also possible for the base body provided with test probe (s) or tool (s) to be moved twice along a component, in particular twice through a groove, once to generate the measurement data on existing defects and once for mechanical processing for error removal. This offers the advantage that the measurement data acquisition is not disturbed by vibrations or the like possibly occurring during mechanical processing.

As an alternative to using a basic body equipped for both testing and machining, it may also be provided that two are preferred in succession At least substantially the same shape having basic body along the component process, wherein at the first along the first component body first body at least one test probe for non-destructive testing of the component is held, and recorded using the at least one held on the first body test probe the measurement data be, which spatially resolved information about errors, in particular cracks in the component include, and wherein the at least one machining tool is then held motorized movable along the component second basic body, and the measured data using the at least one held on the first base probe be provided for the control of the at least one held on the second body machining tool.

A further embodiment is characterized in that the measurement data provided include the depth of defects present in the component to be processed, in particular cracks corresponding depth values and the spatial coordinates respectively associated with the depth values which indicate the respective error position. The depth values may in particular be amplitude values, which is the case, for example, when the measurement data are those obtained by a non-destructive testing of the component by means of eddy current. If the measured data include depth values, it is preferably provided that the at least one machining tool is brought into contact with the component at positions in which, according to the measured data, a depth value is present above a predetermined limit value. Alternatively or additionally, it can then be provided that the at least one machining tool is in each case driven into the component by a depth which depends on the value of the depth value.

A further advantageous embodiment is characterized in that, on the basis of the provided measurement data, at least one envelope is calculated, which contains a plurality of Preferably includes all existing according to the measurement data error, in particular with the respective corresponding error depth. The at least one processing tool is then preferably controlled such that one of the at least one envelope corresponding to material removal is achieved. This procedure allows a material removal optimally adapted to an actual defect finding as well as obtaining a contour that can be checked again for good. It is possible to calculate a plurality of envelopes, in particular belonging to different groove depths, and to achieve a material removal corresponding thereto.

The position determination is particularly preferably carried out using at least one Weggebereinrichtung, which is held in particular to the main body or are. In this case, in particular for the determination of the location coordinates of defects present in a component as well as for the determination of the position of the at least one processing tool train relative to the component, one or more pathway device (s) is used. These preferably have in a manner known per se a movable, in particular rotatable, path detection body mounted on the base body and in particular the further base body, for example in the form of a roller, which runs when the base body or further base body is moved along a component the travel distance is detectable.

The above object is further achieved by a device for material-removing, in particular machining a component, in particular within a groove provided in the component, comprising

- A preferred elongated body, which proceed to process a component along this

at least one material-removing, in particular machining, machining tool which is attached to the base body torisiert movable, in particular motorized is moved and / or pivotally held,

- At least one held on the base body Weggeber- device for determining location coordinates, and

a control device, which is connected to the at least one machining tool and in particular the at least one Weggebereinrichtung preferably via cable or connectable and configured and configured to receive spatially resolved measurement data, the information about errors, in particular cracks in a component to be machined, and the to control at least one machining tool depending on the measured data.

A configured in this way device is particularly suitable for carrying out the method according to the invention.

In a preferred embodiment, the control device comprises at least one in particular programmable microcontroller or is formed by such a microcontroller. If at least one microcontroller is provided, it preferably has a circuit board and / or a microprocessor and / or a plurality of input / output connections. Most preferably, the microcontroller is designed as an Arduino board or includes such. Programmable microcontrollers sold under the brand name Arduino are previously known from the prior art. These include in particular a printed circuit board with a microprocessor and input / output pins. The control device can be arranged within the preferably hollow base body. Alternatively, the control can be done through a computer

In a preferred embodiment of the device, at least one test probe for non-destructive testing of a component is provided which is provided on the main body or on a further at least substantially the same shape as the main body further base body on which at least one is held further Weggebereinrichtung for determining location coordinates, is arranged. The control device is then preferably connected to the at least one test probe and configured to control the at least one machining tool as a function of measured data acquired with the at least one test probe. Particularly preferably, a plurality of probes forming a test probe array is held on the main body or the further main body. In a further development of the device according to the invention it is provided that at least two Weggebereinrichtungen are held on the base body for determining location coordinates, and preferably the Weggebereinrichtungen each have a Wegerfassungskörper which is held on the base body movable, in particular rotatable and arranged such that it with the surface a device to be examined is brought into contact, wherein each of the base body held Weggebereinrichtung is adapted to output in response to that their Wegerfassungskörper moved relative to the base body, a motion signal containing information about the instantaneous speed of movement of the path detection body relative to contains the base body or from which such is derivable, and preferably an arranged in particular in the body Weggeberauswerteeinheit is provided, which verbu with the held on the main body Weggebereinrichtungen and is configured and configured to receive motion signals from the encoders during operation, and to determine continuously or at predetermined time intervals the path detection body of which encoder held on the body is moved fastest, and in particular the motion signal of the encoder with the fastest moving pathfinder body. If the device comprises two main bodies, wherein at least one test probe is held on the one main body and the at least one processing tool is held on the other main body, the further, second basic body can analogously also characterized by at least two Weggebeeinrichtungen. Accordingly, it is provided in a further embodiment that at least two Weggebereinrichtungen for determining location coordinates are held on the further base body, and preferably the Weggebereinrichtungen each have a Wegerfassungskörper which is held on the other body movable, in particular rotatable and arranged such that it with the Surface of a component to be examined is brought into contact, wherein each held on the further base body Weggebereinrichtung is adapted to output in response to that their Wegerfassungskörper is moved relative to the other body, a motion signal containing information about the instantaneous speed of movement of the Contains path detection body relative to the other base body or from which such is derivable, and preferably a arranged in particular in the further body Weggeberauswerteeinheit is provided, which with the on the Grundkör connected to held Weggebereinrichtungen and is designed and configured to receive motion signals from the Weggebereinrichtungen in operation, and to determine continuously or at predetermined time intervals, the Wegsfassungskörper which which is held on the other body held Weggebereinrichtung fastest, and in particular to the motion signal output the Weggebereinrichtung with the fastest moving path detection body.

In a particularly preferred embodiment, the Weggeberwertwerteinheit comprises at least one particular programmable microcontroller or is formed by such. If at least one microcontroller is provided, it preferably has a circuit board and / or a microprocessor and / or a plurality of input / output connections. For example, the microcontroller is designed as an Arduino board or includes such.

Alternatively or additionally, it may be provided that the position encoder evaluation unit is located within the preferably hollow hollow space. formed basic body or within the preferably hollow formed further body is arranged.

The base body preferably has a cross section which is substantially constant along its longitudinal extension. Alternatively or additionally, the main body is characterized by a fir tree or swallow or tea or hammerhead shaped cross section. Does the device include one

Base body and another body for a separate preparation of the measurement data and mechanical processing, so the other body can also be characterized by the above features, each alone or in combination. Furthermore, it can be provided that the at least one machining tool is pivotable about a pivot axis and / or held along a preferably linear trajectory movable on the base body and in particular the control device is designed and configured to the at least one machining tool depending on the provided measurement data about the pivot axis to pivot and / or along the trajectory to process.

Particularly preferably, the control device is designed and set up to carry out the method according to the invention.

The machining contours resulting from the post-processing according to the invention are characterized by the fact that, according to the invention, material is always removed only at those axial positions at which defects are actually present due to a cross section which is not constant in the axial direction. In order to enable a renewed reliable non-destructive testing of machining contours produced in the manner according to the invention, it can furthermore be provided that the test probe or test probes are held resiliently on the main body or further main body in such a way that they move outwards from the main body

Protrude base body and towards the main body against a spring force in these are movable. The resilient mounting ensures that the test probes are always in contact with the surface of the processing contour even when checking machining contours with a variable cross section, while the main body travels along the component to be machined, in particular by a (blade root) becomes. If spring-loaded probes are used to examine a component which has already been mechanically machined according to the invention, its contour is preferably adapted to the contour of the milling tool used for the preceding machining. The test probes can then nestle into the milled groove depending on the depth of cut and have minimal, in the best case no distance to the surface to be measured.

Particularly preferably, a basic body is used for the renewed inspection of an already processed component, which has test probes targeted at those locations which are known to be particularly stressed. In this way it is also possible to record particularly good remaining defects, in particular cracks.

If spring-loaded test probes are used to check already processed components, a base body is particularly preferably used on which test probes are attached to those

Provided in accordance with a previous review

Further features and advantages of the present invention will become apparent from the following description of two embodiments of a device according to the invention with reference to the accompanying drawings. That's it

Figure 1 is a schematic representation of a device for milling according to an embodiment of the present invention, the base body is inserted into a groove of a component to be machined;

Figure 2 is a side view of the device shown in Figure 1;

FIG. 3 is an enlarged schematic representation of one of the eddy current test probes held on the main body of FIG. FIG. 4 shows the coil main body of the eddy current

Test probe of Figure 3 in a perspective front view;

FIG. 5 shows a diagram with the TTL signals of the encoders of the device from FIG. 1 and the TTL signal output by the encoder-evaluation unit of the device,

FIG. 6 is a schematic representation of a first basic body provided with an eddy-current probe array of a second embodiment of a device according to the invention;

FIG. 7 is a schematic side view of a second basic body provided with a milling tool of the second embodiment of the device according to the invention; and

Figure 8 is a schematic sectional view of the

Inner wall of an open basic body with spring-loaded test probes. 1 shows a schematic perspective view of a first embodiment of a device according to the invention, which is designed to carry out a milling operation within a Schaufelfußaufnahmenut 1 only partially shown in Figure 1 rotor 2 a turbomachine, in which a side wall of the Schaufelaufnahmenut 1 defining rotor claw is machined. The blade foot-receiving grooves 1 of the rotor 2 are of identical design and, in the present case, have a cross-section which is constant along their longitudinal extent and has a fir-tree-like cross-section.

The illustrated embodiment of the device according to the invention comprises as main components a hollow main body 4 made of plastic, on which a plurality of vortex flow probes 5, which form a probe array 6, is held, as well as a likewise held on the base 4 milling tool 7, which is formed in the present case by a milling cutter. A side view of the base body 4 with test probe array 6 and milling tool 7 can be seen in FIG.

The main body 4 is elongated and has along its longitudinal extent a substantially constant cross section, which is adapted to the fir-tree-shaped cross section of the Schaufelfußaufnahmenuten 1. Accordingly, this can be inserted into a Schaufelfußaufnahmenut 1 and moved with slight play by this, wherein projections 8 of the base body 4, which extend along the longitudinal extension of the base body 4 and perpendicular to

Protrude longitudinal extension, in corresponding recesses 9 of the grooves 1 engage (see, in particular Figure 1).

To compensate for the existing between the opposing rotor blades 3 and the main body 4 game are distributed over the side walls 10 of the main body 4 spring plungers 11, projecting their hemispherically shaped free ends outwardly from the main body 4 and in the direction of the main body 4 against a spring force are movable.

In the lower region of the base body 4, a recess 12 in the form of a continuous groove is provided in the longitudinal direction. Within this is the milling tool 7, which is rotatable about a tool axis of rotation 13 to a pivotally extending perpendicular to the tool axis of rotation 13 pivot axis 14 held such pivotable that the milling tool 7 between a position in which it is completely received in the recess 12, and a Position in which its tip protrudes by a predetermined amount away from the body 4, as shown for example in Figure 1, can be moved. The milling tool 7 is further motorized height adjustable held on the base body 4, can be moved concretely parallel to the pivot axis 14 up and down. For this purpose, the arrangement is designed accordingly, which is not recognizable in the simplified figures. Both the pivoting movement and the height adjustment take place by way of motorized motors which are not recognizable in the figures and which are arranged within the basic body 4 or within a tool housing 15 assigned to the milling tool 7.

The test probes 5, which are also held on the base body 4, are eddy current test probes in the exemplary embodiment shown. These each sit in a corresponding bore (cf., in particular, FIG. 2) in the hollow main body 4 provided through hole. Of the eddy current probes 5 can be seen in an enlarged view of Figure 3. Each of the eddy current probes comprises a coil base 16, which is produced generatively by the SLS (Selective Laser Sintering) method and consists of a plastic material. A coil main body 16 can be seen in an enlarged schematic representation of Figure 4. The coil main body 16 has a winding head 17, which defines a longitudinal axis 18 of the coil base body 16 and in its outer surface two circumferential grooves 19 are formed, each extending along the entire circumference of the winding head 17 about a winding core 20, wherein the circumferential grooves 19 intersect at the top and at the bottom of the winding head 17 each at the longitudinal axis position at an angle of 90 °. In the circumferential grooves 19, a coil wire 21 is wound in the manner of a cross winding.

By the circumferential grooves 19, the Spulengrundkorper 16 receives a structure with a central winding core 20 around which the coil wire 21 is laid in the manner of a cross winding, and four retaining webs 22, 23, 24, 25 which extend in the longitudinal direction and both in Direction of the two axial end portions of the winding head 17, as well as in the radial direction over the winding core 20 protrude. In this case, the mutually diametrically opposite holding webs 22, 23, 24, 25 are formed corresponding to each other, i. they have the same cross-section and the same external shape. The windings of the eddy current probes 5 are characterized by a high number of turns and winding density.

The shape of the holding webs 22, 23, 24, 25 is adapted to the contour of the surface of the Schaufelfußaufnahmenut 1 to be scanned or tested. This ensures that the eddy current probes 5 can be brought close enough to the contour to be tested. For the connection with the lines, each test probe 5 has two electrical connection lugs 26 each. Each of the plurality of eddy current probes 5 is over lines not shown in Figures 1 and 2, which are all bundled outside the main body 4 in the recognizable in Figures 1 and 2 cable 27, with a

Prüfsondenauswerteeinheit connected in the form of a conventional vortex - power device 28.

By means of the eddy current probes 5, a nondestructive testing of the rotor 2 in the area of the blade root receiving 1, by generating scanning signals and receiving measuring signals from the eddy current probes having the coil wires 22 in a manner known per se, while the base body 4 is guided by a user through a blade root receiving groove 1 to be examined and machined is pushed, for which a handle 29 is provided on the upper side of the base body 4.

In order to enable a local assignment between the measured signals detected with the eddy current test probes 5 and the position points on the rotor surface on which the test probes 5 for measuring signal recording and the displacement of the main body 4 were respectively positioned, an additional positional information of the main body 4 is required to the surface to be tested. To obtain this, the device according to the invention comprises two encoder devices 30 for determining location coordinates associated with detected measurement signals, which are arranged in the hollow base body 4 in the illustrated embodiment. These are shown in dashed lines in the figures. Each of the two Weggeberereinrichtungen 30 each includes a given here by a roller 31 Wegerfassungskörper which is rotatably supported about a rotation axis 32 on the base body 4, wherein the arrangement is such that the two axes of rotation 32 of the rollers 31 are oriented parallel to each other. As can be seen in the figures, the rollers 31 are arranged on the base body 4 such that they project in sections from the base body 4 in order to be able to come into contact with the surface of the rotor claw 3 when the base body 4 is pushed by a user through it , Of the rollers 31, one is arranged on each side of the test probe array 6, specifically one on the left and one on the right. Each of the two encoders 31 is configured to output a motion signal containing information about the instantaneous speed of movement of the roller 31 in response to its roller 31 being rotated such a derivable. Concretely, the encoder devices 31 are each designed to output as motion signal two TTL signals offset by 90 ° from each other, which is also referred to as a 2-phase TTL signal. To this end, the encoders 30 comprise, in addition to the rollers 31, further mechanical and electrical components which are well known from the prior art and are not shown in the purely schematic figures. The device further comprises an encoder encoders 33 arranged in the hollow body 4 in the form of a microcontroller, which in the illustrated embodiment is provided by an arduino board. Both encoders 30 are connected to the path sensor evaluation unit 33 via lines extending within the main body 4 and not shown in the figures. The Weggeberauswerteeinheit 33 is further connected via a likewise not visible in the figures line, which runs outside of the main body 4 together with the lines for the probes through the cable 27, connected to the eddy current device 28.

During a test procedure, that is to say while the main body 4 is moved by a blade root receiving groove 1, the encoder devices 30 transfer their motion signals to the position sensor evaluation unit 33, and this is designed and set up to determine at predetermined time intervals the roller 31 which position encoder device 30 currently being moved the fastest. Only the motion signal of the encoder device 30 with the currently fastest moving roller 31 is output to the eddy current device 28 for assignment to measurement signals detected by the eddy current probes 5.

Specifically, in the described embodiment, the determination of which roller 31 is currently moving faster, by means of a counter. If the role 31 of an encoder 30 is faster, the value is incremented in a global variable. Is the role of the others 31 faster, the same variable is counted down. Depending on the upper value is greater than 2 or less than -2, the corresponding faster Weggebereinrichtung 30 is selected. So the

Count does not run against infinity, the counting interval is limited to the numbers between -2 and 2 here. In order to avoid step losses during the switching process, the additional condition that the two motion signals are equal to the counting of the counter in the illustrated embodiment. For this purpose, the two 2-phase TTL signals are compared directly with each other, and only at phase coincidence is the encoder 30 with the faster roller 31 chosen, i. on the output of the motion signal this changed to the eddy current device 28. This should e.g. Avoid an unwanted change of signal direction, because the switching sequence with 2-phase TTL signals indicates the direction of rotation.

The above becomes particularly clear from consideration of FIG. In this is a 2-phase TTL signal Tl having a first phase PI and a second phase P2 shifted by 90 ° relative thereto, the left-hand travel device 30 in FIGS. 1 and 2 and a 2-phase TTL signal T2 having a first one Phase P3 and a shifted by 90 ° relative to this second phase P4 of the right in Figure 1 and 2 Weggebereinrichtung 30 over the distance s shown. The roller 31 of the left-hand travel device 30 in FIGS. 1 and 2, whose 2-phase TTL signal T 1 is forwarded to the eddy current device 28 by the travel sensor evaluation unit 33, starts to move somewhat slower than that of the right-hand, which can be seen in the larger distance of adjacent rising and falling edges in the signal Tl.

When the first condition occurs (see the associated marking in FIG. 5), the right-hand travel device 30 has issued two edge changes more than the left one. From here on is waiting for phase equality. Only at the position marked "Condition 2" in FIG. 5 is the phase coincidence present. Here, the switchover to the output of the 2- Phase TTL signal T2 of the right Weggebereinrichtung 30 instead of the left.

The resulting 2-phase TTL output signal T3 having a first phase P5 and a second phase P6, which starting from the 2-phase TTL signal Tl the left and from the switching time the 2-phase TTL signal T2 of the right Encoder device 30 corresponds, is also shown in FIG. If the ongoing monitoring results at a later time in that the roller 31 of the left-hand travel device 30 rotates faster than that of the right one, it is switched back again and so on.

All of these evaluation steps are completed with the help of the Wegergieberwerteinheit 33 in the form of an Arduino board.

Of course, a deviating from the above procedure may apply, provided that it is equally suitable to determine the currently fastest role 31.

By using two encoders 30 arranged on both sides of the test probe array 6, on the one hand it is ensured that, for the entire scanning process, a blade root receiving groove 1 is conveyed by means of the eddy current sensor.

Test probe arrays 6 location coordinates are available. Specifically, the roller 31 of the left-hand Weggebereinrichtung 30 in Figures 1 and 2 is already set in motion before the first eddy current data can be obtained with the eddy current Prüfsonden- array 6. Has the left roller 31 the

Leaving Schaufelfußaufnahmenut 1 on the figure 1 to the left side again, is the role 31 of the right Weggebereinrichtung 30 still in contact with the wave claw 3 and provides location information to the recorded with the Prüfsonden- array 6 measurement data. On the other hand, it is ensured that even in the event that a roller 31 moves too slowly due to an error, for example because of a

Slippage in case of contamination of the rotor surface, reliable Location information - about the role 31 of the second Weggebereinrichtung 30 - delivered.

As far as the milling of the shaft claw 3 in the area of the blade root receiving groove 1 is concerned, according to the invention it takes place selectively as a function of the test probe array

6 obtained spatially resolved information about in the rotor 2 in the field of Schaufelfußaufnahmenuten 1 existing defects, in particular cracks.

Specifically, on the basis of eddy current measurement data acquired by means of the test probe array 6, which are spatially resolved as a result of the location information provided by the encoders 30, the positions on the shaft claw 3 are controlled by the milling tool rotating around the tool rotation axis 13 for material removal

7 for material removal in the range of existing errors with the wave claw 3 is engaged. Depending on the spatially resolved eddy current measurement data provided, it is also automatically controlled how deep that is

Milling tool 7 is driven into the shaft claw 3 at the respective positions.

For the control of the milling tool 7, the device comprises a control device 35, which is given in the described embodiment by another microcontroller in the form of another Arduinoboardes and which is also located within the hollow body 4. The control device 35 for the tool control is connected to the not visible in the figures motors for the height adjustment, for the pivoting about the pivot axis 14 and for the rotation of the milling tool 7 about the tool axis of rotation 13. Also connected to the control device 35 for the tool control with the eddy current device 28 to receive spatially resolved eddy current data from this and the Weggebereinrichtungen 31 for positioning the milling tool 7. The control device 35 is - analogous to the Wegge- berauswerteeinheit 33 - designed and configured to to determine which role 31 is currently moving fastest and always use the motion signal of the fastest moving roller 31 for the positioning of the Fräswerkezuges 7 relative to the base body 4.

For detection and subsequent removal of defects, such as cracks in the area of Schaufelfußaufnahmenut 1, the base body 4 by a user by hand through the

Shovel foot groove 1 moves. In the exemplary embodiment shown, the base body 4 is first of all moved through the groove 1 and meanwhile eddy current measurement data and associated location information are detected.

The main body 4 is then moved several more times through the groove 1 in order to remove all, in the measuring passage non-destructively detected defects by material removal.

In the further processing passes, the rotated milling tool 7 is only there by a targeted pivoting about the pivot axis 14 in the shaft claw 3 in the region of

Schaufelfußaufnahmenut 1 driven where there is an error by the non-destructive test with the probe array 6. The extent to which the milling tool 7 is swung out, ie how deep the machining is at the respective point, is controlled in dependence on the relative error depth resulting from the error measurement data. If there are errors, such as cracks at different groove depth positions, ie at different radial positions, the milling tool 7 for the several passes is automatically moved to different radial positions and in the respective radial position the milling machine train 7 is automated only at those axial positions the rotor 2 by a

Pivoting about the pivot axis 14 driven at which there are errors according to the eddy current measurement data. For the removal of material chips created as a result of the milling, a suction device, not shown in the figures, is connected to the suction connection 36. As an alternative to the illustrated embodiment, a computer, such as a laptop as a control device can be used, which can then be connected to the motors via more in particular also bundled leaded out by a cable from the base body 4 lines.

Figures 6 and 7 show a second embodiment of an inventive device for milling a rotor in the range of Schaufelfußaufnahmenuten 1. The same components are provided with the same reference numerals.

The essential difference between the first and the second embodiment of the device according to the invention is that the means for non-destructive testing of Schaufelfußaufnahmenut 1, so the eddy current Prüfsonden- array 6 and the means for error removal, so the milling tool 7 spatially separated from each other, concretely two separate bodies 4 are held.

Correspondingly, the second embodiment of the device according to the invention comprises two hollow base bodies 4, which are characterized by identical outer contours and, in the present case, are identical to the base body 4 of the device according to the first embodiment. In this case, the eddy current probe array 6 is held on the one base body 4 (see FIG. 6) and the milling tool 7 on the other base body 4 (see FIG. Both the first and the second base body 4 are - in analogy to the first embodiment - each provided with two Weggebereinrichtungen 30 each having a roller 31, so that the above already discussed advantages are given both for the measurement data acquisition and the milling. Those Weggebereinrichtungen 30, which are arranged on the milling tool 7 carrying the base body 4, serve in particular the reliable positioning of the milling tool relative to the rotor to be machined when the milling tool 7 carrying the base body 4 by a user by hand by the Schaufelfußaufnahmenut 1 is moved ,

As in the first embodiment, both the Weggeberauswerteeinheit 33 and the control device 35 is given to the tool control in each case by an Arduinoboard, which serves as Weggeberauswerteeinheit 33

Arduinoboard in which the test probe array 6 carrying hollow base body 4 and serving as control means 35 for tool control Arduinoboard in which the milling tool 7 supporting hollow base body 4 is arranged and the corresponding connections are given by lines. The Weggeberauswerteeinheit 33 and the controller 35 are formed and arranged analogous to the above-described the first embodiment.

The main body 4 carrying the test probes 5 is - in analogy to the first embodiment - connected via the cable 27 to an eddy current device 28, not shown in the figure.

If the second exemplary embodiment of the device according to the invention is used, the first and the second basic body 4 are pulled successively through a blade root receiving groove 1 to be tested and, first, that basic body 4 which carries the test probe array 6 for detecting spatially resolved eddy current measured data and then the main body 4, which is provided with the milling tool 7, in order to remove material in the range of existing defects on the basis of the provided data, whereby according to the invention an automated control of the milling tool 7 takes place as a function of the eddy current measurement data. The eddy current measurement data acquired with the test probes 5 and position data acquired with the encoder devices 30 are processed and computed in the illustrated embodiment on a computer not shown in the figures. For example, an envelope or several envelopes belonging to different groove depths is calculated, which include or include all detected errors. The computer transmits the processed data to the control device 35 for the control of the milling tool 7 and this is controlled depending on the data, while the milling tool 7 carrying the base body 4 by hand by the Schaufelfußaufnahmenut 1 is pushed. The control is carried out, for example, such that a material envelope corresponding to the envelope or the envelopes is achieved. This procedure allows material removal optimally adapted to an actual defect finding as well as the preservation of a contour which can in turn be checked thoroughly. Of course, an envelope curve calculation and corresponding subsequent removal of material can also be carried out in the context of the first exemplary embodiment described above with a base body.

With the use of the device according to the invention of carrying out the method according to the invention, various advantages are associated. On the one hand, the amount of removed material compared to the prior art is significantly reduced, in particular limited to one of the actually existing error finding possible minimum. In addition, 7 computable machining contours are obtained in particular as a result of the motorized control of the milling tool. These are particularly suitable for carrying out a basis for a service life calculation. If detected defects were removed with a completely hand-held tool, there would be no certainty about the geometry of the resulting contours.

The machining contours resulting from the post-processing according to the invention are characterized by the fact that the material always only starts removed from those axial positions where there are actually errors, by a non-constant in the axial direction of cross-section. In order to enable a renewed reliable non-destructive inspection of machining contours produced in the manner according to the invention, it can be provided that the test probes 5 of the test probe array 6 on the main body 4 are held resiliently on the base body 4 in a manner similar to the spring pressure pieces 11 outwardly projecting from the base body 4 and in the direction of the main body 4 against a spring force in these are movable.

FIG. 8 shows an exemplary embodiment for the resilient mounting of the test probes 5 on a hollow main body 4. The figure shows a sectional view of the inside of the wall 37 of an open hollow body 4, as can be seen in Figures 1 and 2 and 5 and 6. The resilient mounting is realized via metallic spring elements 38, which are fixed at one end by means of a screw 39 on the wall 37 of the base body 4 inside and with its other end in each case a test probe 5, into which a line 34 opens, overlap on the back. If a force is exerted on a test probe 5 from the outside, this force is displaced inward against the then yielding spring element 38 within the receiving bore. If no force acts from outside, the test probe 5 protrudes from the base body 4 by a defined maximum value. In this state, protruding from the test probe 5 stops 40 on the inside of the wall of the body 4 at. The respective spring element 38 fixing screws 39 are each screwed into a threaded bore which is provided in a projecting from the wall 37 inwardly projecting cylindrical projection 41 and the probes 5 each sit in a through hole, which is also provided in such a cylindrical projection 41 ,

If a basic body 4 equipped with test probes 5 held in this way is held by a blade root receiving groove 1 moves follow the probes 5 already prepared machining contours even in that case that they are characterized by a variable cross-section. As a result of this embodiment, the eddy current probes 5 can be used in different milling depths. The spring-mounted probes are preferably designed such that their contour is adapted to the contour of the milling tool 7 used in the context of a previous machining. Depending on the depth of cut, the test probes 5 can then nestle into the recessed groove and have minimal, in the best case, no distance from the surface to be measured. Since the test probes 5 are always in contact with the component surface even in the case of grooves with an axially variable depth of cut in the case of resilient mounting, they also provide reliable measurement data for existing components, even for components processed according to the invention

Errors.

Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims

claims

1. A method for performing a material-removing, in particular machining a component (2), in particular within a provided in the component groove (1), are provided in the spatially resolved measurement data, the information about errors, in particular cracks in the component (2) , and

- A material-removing, in particular machining of the component (2) with at least one motorized movable, in particular motorized moved and / or pivotally mounted machining tool (7) takes place and is preferably controlled automatically depending on the measurement data provided, at which positions on the component (2) the at least one machining tool (7) for material removal in the range of existing errors with the component (2) is brought into engagement, and in particular automatically controlled depending on the provided measurement data, how deep the at least one Machining tool (7) is driven into the component (2).

2. The method according to claim 1,

characterized in that

a base body (4) on which the at least one machining tool (7) is held movably movable, preferably manually moved along the component (2), and is preferably automatically controlled in dependence on the provided measurement data, at which positions on the component (2) the at least one machining tool (7) is moved relative to the base body (4) in such a way that it engages with the component (2) for material removal.

3. The method according to claim 2,

characterized in that

the at least one machining tool (7) on the base body (4) is pivotable about a pivot axis (14) and / or moveable along a preferably linear trajectory, and controlled in particular as a function of the provided measurement data, at which positions on the component (2) and to what extent the at least one machining tool (7) pivots about the pivot axis (14)

and / or moved along the travel distance.

4. The method according to claim 2 or 3,

characterized in that

a material-removing machining within a groove (1) takes place, in particular within a blade root receiving groove of a turbomachine, and measurement data is preferably provided which contains spatially resolved information about defects, in particular cracks in the component (2), at least in relation to the longitudinal extension direction of the groove (1). in the area of the groove (1), and the base body (4) is moved in the longitudinal direction of extension of the groove (1).

5. The method according to any one of claims 2 to 4,

characterized in that

a base body (4) is moved along the component (2), on which at least one test probe (5) is held for non-destructive testing of the component (2), and using the at least one test probe held on the base body (4) ( 5) measurement data are recorded, which spatially resolved information about errors, in particular cracks in the component (2) include, and the detected measurement data for the control of the at least one on the base body (4) held machining tool (7) are provided.

6. The method according to any one of claims 2 to 4,

characterized in that

successively two preferably at least substantially the same shape having basic body (5) along the component (2) are moved, wherein at the first along the first component (2) first base body (4) at least one test probe (5) for non-destructive testing of the component (2), and using the at least one test probe (5) held on the first base body (4), the measurement data are acquired which contain spatially resolved information about defects, in particular cracks in the component, and along which of the component (2) moved second basic body (4) the at least one machining tool (7) is held movable by motorized, and by using the at least one on the first base body (4) held test probe (5) detected measurement data for controlling the at least one on the second base body (4) held machining tool (7) are provided.

7. The method according to any one of the preceding claims, characterized in that

the provided measurement data on the depth of defects present in the component (2), in particular depth values corresponding to cracks, in particular amplitude values and spatial coordinates respectively associated with the depth values, which indicate the respective fault position, and that the at least one machining tool (7) Positions is brought into engagement with the component (2) at which, according to the measured data, a depth value is above a predetermined limit, and / or the at least one machining tool (7) in each case by a depth of the depth dependent depth in the component (2 ) is driven.

8. The method according to any one of the preceding claims, characterized in that

on the basis of the provided measurement data, at least one envelope is calculated, which includes several, preferably all, errors according to the measurement data, and that the at least one processing tool (7) is controlled such that a material removal corresponding to the at least one envelope is achieved.

9. Device for removing material, in particular machining a component (2), in particular within a provided in the component (2) groove (1) comprising

- A preferably elongated base body (4), which is to be moved for machining a component (2) along this, at least one material removing, in particular machining of the machining tool (7) which on the base body (4) motorized movable, in particular motorized traversing and / or is held pivotably, at least one of the base body (4) held Weggebereinrichtung (30) for determining location coordinates, and a control device (35) which with the at least one machining tool (7) and in particular the at least one Weggebereinrichtung (30) preferred Connected via cable or connectable and trained and is directed to receive spatially resolved measurement data, the Informa tions about errors, in particular cracks in a bear to processing component (2) to receive and we least one machining tool (7) depending on the measured data to control.

10. Apparatus according to claim 9,

characterized in that

at least one test probe (5) for non-destructive testing of a component (2) is provided, on the base body (4) or on a preferably at least substantially the same shape as the base body (4) further base body (4) on which at least another Weggebereinrichtung (30) is held for the determination of location coordinates, is arranged, and the control device (35) with the at least one test probe (5) connected and adapted to the at least one machining tool (7) in dependence on at least one Test probe (5) control measured data.

11. Apparatus according to claim 9 or 10,

characterized in that

on the base body (4) at least two Weggebereinrichtungen (30) are held for determining location coordinates, and preferably the Weggebereinrichtungen (30) each have a Wegerfassungskörper (31) which is held on the base body (4) movable, in particular rotatable and arranged in that it can be brought into contact with the surface of a component (2) to be examined, each positioner device (30) held on the base (4) being designed in response to its position-sensing body (31) relative to the latter The base body (4) is moved to output a motion signal which contains information about the instantaneous speed of movement of the position-sensing body (31) relative to the base body (4) or from which such is derivable, and preferably one in particular in the base body (FIG. 4) arranged Weggeberauswerteeinheit (33) is provided, which with the on the base body (4) held Weggebereinrichtungen (30) ver and adapted and configured to receive motion signals from the encoder means (30) during operation, and to determine continuously or at predetermined time intervals, the position sensing body (31) which moves the encoder (30) mounted on the body fastest and, in particular, to output the motion signal of the encoder means (30) with the fastest moving path detecting body (31).

12. Device according to claim 10 or 11,

characterized in that

the at least one test probe (5) is arranged on a further basic body (4), and at least two encoder devices (30) for determining location coordinates are held on the further main body (4), and the encoder devices (30) each prefer a position detector body (31) which is movable, in particular rotatably held on the further base body (4) and is arranged such that it can be brought into contact with the surface of a component to be examined (2), wherein each of the further base body (4 ) is arranged to output a motion signal in response to its path detection body (31) being moved relative to the further base body (4) containing information about the instantaneous speed of movement of the path detection body (31) relative to contains the further basic body (4) or from which such a derivative is derived, and preferably one in particular in the further Grundkö 4), which is connected to the immobilizer devices (30) held on the main body (4) and is designed and configured to receive motion signals from the encoder devices (30) during operation, and to continuously monitor them. lent or to determine at predetermined time intervals, the path detection body (31) which is moved to the further base body held Weggebereinrichtung fastest, and in particular to output the motion signal of the Weggebereinrichtung (30) with the fastest moving Wegerfas- sungskörpers (31).

13. The method according to any one of claims 9 to 12, characterized in that

the base body (4) and in particular the further basic body (4) has a substantially constant cross-section along its longitudinal extent and / or that the base body (4) and in particular the further base body (4) has a fir-tree or swallows or T-shaped or Hammerkopf- shaped cross-section.

14. The method according to any one of claims 9 to 13,

characterized in that

the at least one machining tool (7) is pivotable about a pivot axis (14) and / or held movably along a preferably linear travel path on the base body (4), and in particular the control device (35) is designed and arranged around the at least one machining tool (7) in response to the measurement data provided to pivot about the pivot axis (14) and / or to move along the trajectory.

15. The method according to any one of claims 9 to 14,

characterized in that

the control device (35) is designed and set up to carry out the method according to one of Claims 1 to 8.