JP6573952B2 - Comb height grinding device for labyrinth packing - Google Patents

Description

  The present invention relates to a grinding apparatus, and more particularly to an apparatus suitable for grinding the height of comb teeth in a labyrinth packing.

  It is stipulated by the Electricity Business Law that the turbines of thermal power plants are to be periodically inspected at regular intervals. The labyrinth packing is a non-contact seal installed around the axis of the turbine, and plays a role of reducing the amount of leakage of gas flowing to the turbine. The labyrinth packing has comb-like fins on the sealing surface. The labyrinth packing is subjected to correction processing of the comb-like fins every periodic inspection work.

  Conventionally, the modification work of the comb-like fins has been performed manually by an operator because of the particularity of the form. However, the finish of correction processing and the time required for processing vary greatly depending on the skill level of the operator.

  In view of such a situation, when examining the automation when correcting the labyrinth packing, it has been found that there are various proposals as an apparatus for cutting or grinding a workpiece. As disclosed in Patent Document 1, most of the apparatuses are provided with a stage that holds the workpiece and moves horizontally, and a mechanism that moves the rotary tool in the vertical direction. Further, as disclosed in Patent Document 2, an apparatus has been proposed in which a stage is moved in the longitudinal direction of a workpiece and a rotary tool is moved in the width direction of the workpiece. In the apparatus disclosed in Patent Document 2, the rotary tool is brought into contact with the grinding part of the workpiece obliquely.

Japanese Patent Laid-Open No. 7-60630 JP 2002-273644 A

  When carrying out automatic processing of long objects, it is considered that it is premised that an apparatus having the above-described moving shaft is used. However, most of the proposed apparatuses have a processed surface that is flat (straight) or a new workpiece.

  For this reason, unlike labyrinth packing, there is no apparatus that can cope with the correction processing of a workpiece having different curvatures and sizes depending on the turbine solid and having different states depending on the years of use and the usage environment.

  Therefore, an object of the present invention is to provide a comb-teeth height grinding apparatus for labyrinth packing that can solve the above-described problems and can perform correction processing regardless of the curvature, size, and state.

  In order to achieve the above object, a comb-teeth height grinding apparatus for labyrinth packing according to the present invention includes an X-axis direction along the longitudinal direction of the labyrinth packing to be ground and a Y-axis direction along the width direction of the labyrinth packing. A stage that is movable on the stage, a gripping mechanism that is disposed on the stage and fixes the labyrinth packing, a grinding means for grinding the upper surface of the comb teeth of the labyrinth packing, and a height of the labyrinth packing. Z axis actuator that moves in the Z axis direction along the direction and a plurality of comb teeth formed on the labyrinth packing, at least three Z axes along the X axis direction of the upper surface of the comb teeth for each comb tooth Based on the measuring means for measuring the coordinates, the Z-axis coordinates measured by the measuring means, and the X-axis coordinates at each measurement point, the upper surface of the comb teeth is determined in advance. Was created machining data for grinding in grinding amount, relative to said Z-axis actuator and the stage, characterized in that it comprises a control means for outputting a control signal based on the processed data.

  In the comb-teeth height grinding apparatus for labyrinth packing having the above-described features, the measurement of the Z-axis coordinates is performed by adjoining points along the X-axis, and the control means is based on the coordinates of the measurement points. An approximate arc shape is calculated from the shape of the upper surface of the comb teeth, and processing data for grinding the upper surface of the comb teeth with a predetermined grinding amount by the grinding means is created based on the arc shape. You can also

  In the comb-teeth height grinding apparatus for labyrinth packing having the above-described features, the gripping mechanism includes a fixed contact plate fixed on the stage, and a movable contact plate disposed to face the fixed contact plate. And the labyrinth packing is configured such that the arrangement height of the labyrinth packing is determined with the support as a base point and is gripped by the fixed contact plate and the movable contact plate. good. By having such characteristics, the labyrinth packing can be easily positioned. Therefore, the labor required for fixing the arrangement of the labyrinth packing can be reduced and the time can be shortened.

  In the labyrinth packing comb height grinding apparatus having the above-described features, the fixed contact plate and the movable contact plate may be provided with arc-shaped notches that follow the arc of the labyrinth packing. . By having such a feature, when the labyrinth packing is gripped, a sufficient area of the labyrinth packing gripped by the fixed abutment plate and the movable abutment plate can be secured. Therefore, the fixed state of the labyrinth packing can be stabilized.

  Further, in the comb-teeth height grinding apparatus for labyrinth packing having the above-mentioned features, the measuring means is provided in a slider attached to the Z-axis actuator, and is capable of moving between a measuring position and a retracted position. It is good if it is said. By having such a feature, the measurement unit can change the arrangement position via the slider.

  Furthermore, the measurement means may be a contact-type measurement means having a measurement pin having a linear contact portion that is larger than the width of the upper surface of the comb teeth and smaller than the pitch between the plurality of comb teeth arranged in parallel. By having such a feature, it is possible to prevent a measurement error due to the position of the measurement pin of the measurement means and the comb teeth being displaced in the Y-axis direction.

  According to the comb-teeth height grinding apparatus for labyrinth packing having the above-described features, the comb-teeth height can be ground regardless of the curvature, size, and state of the labyrinth packing. For this reason, it becomes possible to correct the labyrinth packing with high accuracy in a short time without depending on the skill level of the operator.

It is a front view which shows the external appearance structure of the comb-tooth height grinding apparatus of the labyrinth packing which concerns on embodiment. It is a left view which shows the external appearance structure of the comb-tooth height grinding apparatus of the labyrinth packing which concerns on embodiment. It is a top view which shows the external appearance structure of the comb-tooth height grinding apparatus of the labyrinth packing which concerns on embodiment. It is an enlarged side view which shows the structure of a holding | grip mechanism. It is an enlarged front view which shows the structure of a holding | grip mechanism. It is the elements on larger scale which show the relationship between the comb tooth of a labyrinth packing, and the measurement pin in a measurement means. It is a block diagram which shows the image of the whole system of the comb-tooth height grinding apparatus of the labyrinth packing containing a control means. It is a flowchart which shows the process at the time of performing comb-tooth grinding of a labyrinth packing with the comb-tooth height grinding apparatus of the labyrinth packing which concerns on embodiment. It is the partial enlarged front view of the labyrinth packing shown in order to calculate the circular arc shape approximated based on a plurality of measurement points, and to create the processing data, when there are a plurality of measurement points.

  Hereinafter, an embodiment according to a comb tooth height grinding apparatus for labyrinth packing of the present invention will be described in detail with reference to the drawings. In the drawings, FIGS. 1 to 3 are a front view, a left side view, and a plan view showing an external configuration of a labyrinth packing comb tooth height grinding device according to an embodiment. FIG. 4 is an enlarged side view showing the configuration of the gripping mechanism, and FIG. 5 is a front view thereof. FIG. 6 is a partially enlarged view showing the relationship between the comb teeth of the labyrinth packing and the measuring pins in the measuring means. FIG. 7 is a block diagram showing an image of the entire system of the comb-teeth height grinding apparatus for labyrinth packing including the control means. Furthermore, FIG. 8 is a flowchart which shows the process at the time of performing the comb-teeth grinding of the labyrinth packing by the comb-teeth height grinding apparatus of the labyrinth packing according to the embodiment.

[Configuration of grinding equipment]
The comb-teeth height grinding apparatus (hereinafter simply referred to as the grinding apparatus 10) of the labyrinth packing according to the embodiment includes a base 12, a stage 14, a grinding means 34, a Z-axis actuator 26, a measuring means 38, and a control means 42. Have. The base 12 is a foundation of the grinding apparatus according to the tenth embodiment.

[About the stage]
The stage 14 is a table that moves in the X-axis direction and the Y-axis direction. Further, on the stage 14, a gripping mechanism 24 for fixing a labyrinth packing 60 that is a workpiece is provided. In the present embodiment, the X axis is a direction indicated by an arrow A in FIGS. 1 and 3, and is a direction along the longitudinal direction when the labyrinth packing 60 is fixed by the gripping mechanism 24. The Y axis is a direction indicated by an arrow B in FIGS. 2 and 3, and is a direction along the width direction when the labyrinth packing 60 is fixed by the gripping mechanism 24.

  The stage 14 according to the embodiment includes an X-axis mechanism 16, an X-axis stage 18, a Y-axis mechanism 20, and a Y-axis stage 22. The X-axis mechanism 16 includes, on the base 12, a guide rail 16a disposed along the X-axis, a ball screw 16b, and an X-axis motor 16c that rotates the ball screw 16b. The X-axis stage 18 is a slider that moves as the ball screw 16b rotates, and has a sliding portion 18a along the guide rail 16a.

  The Y-axis mechanism 20 includes a guide rail 20a disposed along the Y-axis on the X-axis stage 18, a ball screw 20b, and a Y-axis motor 20c that rotates the ball screw 20b. The Y-axis stage 22 is a slider that moves as the ball screw 20b rotates, and has a sliding portion 22a along the guide rail 20a. A gripping mechanism 24 is provided on the Y-axis stage 22.

[Gripping mechanism]
The gripping mechanism 24 is a means for fixing the labyrinth packing 60, and the grinding apparatus 10 according to the embodiment includes a fixed contact plate 24a, a movable contact plate 24b, a support 24c, and a clamp 24d. The fixed abutment plate 24 a is a positioning member that is fixed to the Y-axis stage 22 constituting the stage 14. The movable contact plate 24b is a member that is disposed to face the fixed contact plate 24a and plays a role of sandwiching the labyrinth packing 60 between the fixed contact plate 24a and the movable contact plate 24b. The support column 24c is a slide guide for the movable contact plate 24b that extends along the Y-axis direction with the fixed contact plate 24a as a base point and is disposed through the movable contact plate 24b. In the case of this embodiment, it is set as the structure which provides two pairs of support | pillars 24c along an X-axis.

  In the present embodiment, arc-shaped notches 24a1 and 24b1 (see FIG. 5) are provided at the upper ends of the fixed abutment plate 24a and the movable abutment plate 24b. The circular arc shape of the notches 24a1 and 24b1 may follow the circular arc shape of the labyrinth packing 60 to be ground. By providing the arc-shaped cutouts 24a1 and 24b1 in the fixed abutment plate 24a and the movable abutment plate 24b constituting the gripping mechanism 24, a sufficient gripping area of the labyrinth packing 60 having an arcuate shape can be secured, and the gripping state is stabilized. Can be realized. The arcs forming the notches 24a1 and 24b1 are preferably formed in accordance with the arc of the labyrinth packing 60 having a large overall diameter. This is because by forming the notches 24a1 and 24b1 in accordance with the large arc, it is possible to cope with the labyrinth packing 60 having a small diameter.

  Moreover, the support | pillar 24c arrange | positioned in a pair can determine the arrangement | positioning height of the labyrinth packing 60 from the support | pillar 24c as a base point by matching the arrangement | positioning height with the holding height of the labyrinth packing 60. FIG. Therefore, the arrangement (positioning) of the labyrinth packing 60 can be easily performed.

  The clamp 24d plays a role of pressing the movable contact plate 24b holding the labyrinth packing 60 against the fixed contact plate 24a and maintaining the fixed state of the labyrinth packing 60. As long as the clamp 24d plays the role, it does not ask | require a specific structure, For example, a thing like a shaman may be sufficient. In the present embodiment, in consideration of the ease of the process of gripping the labyrinth packing 60, a laterally pressing toggle clamp is employed. By fixing the main body of the clamp 24d to the Y-axis stage 22 and bringing the pressing portion into contact with the movable contact plate 24b, it is possible to perform pressing and releasing according to the swing of the lever. In this embodiment, the clamps 24d are arranged at two points along the X axis so as to stabilize the gripping state.

[About grinding means]
The grinding means 34 is an element for grinding the upper surface of the comb teeth 62 in the labyrinth packing 60. In this embodiment, a router is selected as the grinding means 34, and this router is attached to a slider 30 of a Z-axis actuator 26 described later, thereby enabling relative operations with respect to three axes such as the X-axis, Y-axis, and Z-axis. It is configured.

  The grinding means 34 includes a rotating grindstone 36. The grinding means 34 is arranged so that the rotational axis of the rotating grindstone 36 is along the Y axis with respect to the slider 30 of the Z-axis actuator 26.

[Z-axis actuator]
The Z-axis actuator 26 is an element responsible for the operation with respect to the movement axis (Z-axis) in a direction (vertical direction) orthogonal to both the X-axis and the Y-axis. The configuration of the Z-axis actuator 26 can be basically the same as that of the X-axis mechanism 16 and the Y-axis mechanism 20. That is, with the rotation of the guide rail 26a disposed along the vertical base 28 erected along the Z-axis direction with the base 12 as a base, the power unit including the ball screw 26b and the Z-axis motor 26c, and the rotation of the ball screw 26b. The slider 30 is provided, and a bracket 32 is attached to the slider 30. With such a configuration, the slider 30 can be moved along the Z-axis by a control signal to the Z-axis motor 26c.

[Measurement means]
The measuring means 38 is an element for measuring the Z-axis coordinates of the upper surface of the comb teeth 62 in the labyrinth packing 60, and is attached to the bracket 32 provided in the slider 30 of the Z-axis actuator 26 in this embodiment. By measuring the Z-axis coordinate of the upper surface of the comb teeth 62 in the labyrinth packing 60 by the measuring means 38, the zero point at the time of grinding can be derived. Further, by measuring at least three Z-axis coordinates along the X-axis direction, the radius of curvature of the upper surface of the comb teeth 62 in the labyrinth packing 60 to be ground can be calculated. As a result, the relative movement path of the grinding means 34 can be obtained in the relationship between the Z-axis actuator 26 and the X-axis mechanism 16.

  Further, in the present embodiment, the slide mechanism 40 is provided between the measuring unit 38 and the bracket 32 because the arrangement positions of the measuring unit 38 and the rotating grindstone 36 of the grinding unit 34 are close. By providing the slide mechanism 40, the arrangement position of the measuring means 38 can be switched between the measurement position and the retracted position.

  As a specific configuration of the slide mechanism 40, any structure may be used as long as it includes a rail along the Z-axis direction with respect to the bracket 32 and a slider movable on the rail, and the measuring means 38 is fixed to the slider. Just do it. Although the drive type of the slider is not limited, in the present embodiment, from the viewpoint of not requiring stepwise movement control, shortening the arrangement position switching time, and simplifying the configuration. An air cylinder type is used.

  Further, in the present embodiment, the measurement point is not a flat surface but a narrow convex portion such as the upper surface of the comb teeth 62 in the labyrinth packing 60, and thus the contact-type measuring means 38 is employed. Further, as shown in FIG. 6, the measuring pin 38a of the measuring means 38 has a linear contact portion 38a1 that is larger than the width of the upper surface of the comb teeth 62 and smaller than the pitch between the adjacent comb teeth 62 and the comb teeth 62. What is possessed is adopted, and the linear portion is arranged in a direction crossing the extending direction of the comb teeth 62. By adopting such a configuration, it is possible to prevent a measurement error due to a shift in the position with respect to the Y-axis direction (the direction indicated by the arrow B in FIG. 6).

[About control means]
The control means 42 (see FIG. 7) controls the operation of the stage 14, the Z-axis actuator 26, the grinding means 34, the measurement means 38, the slide mechanism 40, etc., and the grinding means 34 controls the upper surface of the comb teeth 62 in the labyrinth packing 60. Play the role of grinding. An example of the structure of the control means 42 applied to the grinding apparatus 10 according to the embodiment is shown in FIG. Input of predetermined element data is made to the control means 42. The element data is input via an input terminal 44 such as a control PC attached to the control means 42. Further, the input terminal 44 only needs to store a program (for example, a grinding application 44a) for controlling the grinding apparatus 10.

  The control means 42 is provided with a motion control board 46, a router controller 48, a measuring means amplifier 50, and the like as interfaces for transmitting and receiving control signals to and from the input terminal 44. The motion control board 46 is an element for controlling the stage 14 and the Z-axis actuator 26 in the grinding apparatus 10, and for driving control via the X-axis driver 46a, the Y-axis driver 46b, and the Z-axis driver 46c. The control signal (drive pulse) is generated and output. The X-axis motor 16c, the Y-axis motor 20c, and the Z-axis motor 26c are rotated in accordance with control signals output from the drivers (46a to 46c).

  The router controller 48 is an element for performing operation control of the grinding means 34, the measuring means 38, and the slide mechanism 40. The router controller 48 directly outputs a signal for controlling the rotational speed of the rotating grindstone 36 in the grinding means 34. On the other hand, position control of the measurement pin 38a in the measurement means 38, switching control between the measurement position and the retracted position in the slide mechanism 40, and the like are performed indirectly. Specifically, a compressor 52 for supplying compressed air is connected to the measuring means 38 and the slide mechanism 40. The compressed air supplied from the compressor 52 to the measuring unit 38 plays a role of extending the measuring pin 38a of the measuring unit 38 to the standby state. The compressed air supplied from the compressor 52 to the slide mechanism 40 plays a role of moving the measuring means 38 from the retracted position to the measuring position.

  Between the compressor 52, the measuring means 38, and the slide mechanism 40, a regulator 54 for adjusting the supply pressure of compressed air and valves 56a and 56b are provided. The valves 56 a and 56 b may be switching valves such as electromagnetic valves, and the compressed air supply path is opened when a control signal from the router controller 48 is input.

  The amplifier 50 for measuring means plays a role of amplifying an electric signal output from the measuring means 38 due to the measurement of the comb teeth 62 in the labyrinth packing 60 and outputting it to the input terminal 44 as a detection signal.

[About grinding control]
Hereinafter, grinding of the comb teeth 62 in the labyrinth packing 60 by the grinding apparatus will be described with reference to FIG. 8 together with the description of the element data described above.

  First, the element data, which is the input data described above, can include the number of cracks, the arch size, the number of comb teeth, the comb tooth pitch, the start measurement point, the designated processing amount, and the like. Here, the number of cracks is the number of divisions of the labyrinth packing 60. The labyrinth packing has a circular shape that matches the shaft diameter of a turbine (not shown), and the labyrinth packing 60 to be processed (more precisely, the labyrinth packing piece) is a piece obtained by dividing the circular labyrinth packing into a plurality of pieces. One. Further, since the division is equally divided, the inner angle of the circle can be obtained by inputting the number of divisions.

  The bow dimension is the distance between the ends of the upper surfaces of the comb teeth 62 in the labyrinth packing 60 to be ground, that is, the length of the portion corresponding to the chord of the arc. The movement distance of the X axis in one grinding can be determined. In addition, since the interior angle of the apex of the isosceles triangle is determined by the number of cracks, the length of the two sides that make up the isosceles triangle (the radius of the arc) can be entered by entering the base length (bow dimension) by the bow dimension. R) can be determined. Specifically, it can be obtained by calculating a / (2 × cos θ), where a is the length of the base, and θ is the internal angle located at both ends of the base.

  The number of comb teeth is the number of comb teeth 62 provided in one labyrinth packing 60 to be ground. This is to determine the number of times of grinding. Further, the comb tooth pitch is an arrangement interval of the comb teeth 62 along the Y-axis direction. This is to determine the moving distance in the Y-axis direction of the rotating grindstone (grinding means) when grinding each comb tooth 62.

  The start measurement point is the three XY coordinates of the comb tooth 62 to be processed first, and the designated processing amount is a grinding amount for grinding the upper surface of the comb tooth 62 (S10: element data input).

  In the control means 42 to which such element data is input, first, compressed air is supplied to the slide mechanism 40 and the measurement means 38, the measurement means 38 is moved to the measurement position, and the measurement pin 38a is extended. To enter standby mode. Thereafter, control signals are given to the X-axis motor 16c, the Y-axis motor 20c, and the Z-axis motor 26c based on the radius R of the upper surface of the comb teeth 62 in the labyrinth packing 60 calculated based on the input element data, and measurement is performed. The Z-axis coordinates of the three points at the upper surface position of the comb teeth 62 by means 38 are measured. Thereafter, the curvature radius of the upper surface of the comb teeth 62 in the labyrinth packing 60 is calculated based on the measured three Z-axis coordinates and the measured X-axis coordinates (S20: measurement).

  After obtaining the curvature radius of the upper surface of the comb tooth 62, based on the input element data and the calculated curvature radius, the machining path, the operation amount of the X-axis motor 16c, the Y-axis motor 20c, and the Z-axis motor 26c, grinding means Machining data such as the rotational speed 34 is created (S30: machining data creation).

  After the machining data is created, various controls are performed according to the machining data, and the upper surfaces of the comb teeth 62 in the labyrinth packing 60 are ground. The measuring means 38 is controlled to move to the retracted position at least before the grinding step after the measurement of the Z-axis coordinates (S40: grinding).

  After the grinding process is completed, the measuring means 38 is moved again to the measurement position, and the three Z-axis coordinates measured in the measurement process are measured (S50: re-measurement). Based on the measured value before the grinding process and the measured value after the grinding process, the machining amount is calculated (S60: machining amount measurement). It is determined whether or not the calculated machining amount is a value that approximates the designated machining amount. Here, the approximate range may be a predetermined threshold range according to the required processing accuracy (S70: determination).

  If it is determined that the machining amount is within the threshold value range, the grinding of the labyrinth packing 60 ends. On the other hand, when the machining amount is out of the threshold range, the machining amount is input again (S80: re-input of machining amount), and the process returns to S30 to create machining data and the labyrinth packing 60 is ground. The Here, examples of factors that cause the machining amount to be outside the threshold range include wear of the rotating grindstone 36 and escape of the rotating shaft in the grinding means 34. Therefore, the necessity of re-inputting element data may be determined by checking the dimensions of the rotating grindstone 34 and the mounting state of the grinding means 34 before reworking as necessary.

[Function and effect]
According to the grinding apparatus 10 as described above, grinding can be performed regardless of the curvature, size, and state of the labyrinth packing 60. For this reason, it is possible to perform correction processing with high accuracy in a short time without depending on the skill level of the operator.

[Modification]
Moreover, you may make it provide the following functions and mechanisms in the grinding apparatus 10 which concerns on the said embodiment.

  First, in the said embodiment, it described that it arrange | positions in the direction (direction orthogonal to X-axis) along the Y-axis about the rotating shaft (rotating shaft of the grinding means 34) of the rotating grindstone 36. FIG. However, the rotation axis of the rotating grindstone 36 may be set to be inclined with respect to the Y axis. By setting it as such an arrangement | positioning form, the rotating grindstone 36 will contact diagonally with respect to the comb tooth 62. FIG. Thereby, the contact area of the rotary grindstone 36 and the comb teeth 62 can be increased. For this reason, it is possible to suppress the knitting wear of the rotating grindstone 36.

  Further, as a means for suppressing knitting wear of the rotating grindstone 36, the amount of movement of the Y axis that is moved each time the comb teeth 62 are ground may be shifted by plus or minus several percent with respect to the pitch of the comb teeth 62. good. This is because the contact points of the comb teeth 62 with the rotating grindstone 36 can be dispersed.

  Furthermore, the grinding apparatus 10 may be provided with a function for performing a cleaning (leveling) operation of the rotating grindstone 36 at the end of the grinding process. This is because knitting wear of the rotating grindstone 36 can be suppressed by providing such a function.

  Moreover, in the said embodiment, when creating process data, the measurement means 38 measures the Z-axis coordinate of the upper surface of the comb tooth 62 at three points along the X-axis direction of the labyrinth packing 60, and the X at each measurement point. It was described that the radius of curvature was calculated based on the axis coordinates and the Z axis coordinates. However, the creation of the processing data in the grinding apparatus 10 of the present invention may be performed using data based on various measurement values.

  For example, when the points along the X-axis for measuring the Z-axis coordinates are adjacent to each other and the number thereof is increased, the coordinates of the measurement points obtained continuously are the data representing the shape (profile) of the upper surface of the comb teeth 62. It is possible to use an approximate value of. The control means 42 calculates an approximate arc shape from the profile of the upper surface of the comb teeth 62 based on the measured actual coordinates, and creates machining data based on the arc shape. Here, the approximate arc shape means coordinates (points indicated by a to x) located at a plurality of measurement points indicated as concave portions or convex portions, as shown in the partial enlarged view of the labyrinth packing 60 in FIG. Among the shapes shown connected by straight lines or arcuate curves, it passes through a plurality of convex points (in FIG. 9, for example, b, c, i, j, m, n, w, x, etc.). The arc may be a circle defined by (indicated by a two-dot chain line in FIG. 9). By defining in this way, the grinding process is performed based on the most convex point, and the escape of the rotating grindstone 36 from the labyrinth packing 60 due to the deep grinding depth and the damage due to the applied load are prevented. Because you can do things. In FIG. 9, the top surface of the comb teeth 62 is exaggerated for easy understanding.

  As another machining data creation method, a grinding amount for each measurement point is determined based on each measurement coordinate and a predetermined grinding amount, and machining is performed so that each point has a designated grinding amount. You may make it produce the data to perform.

DESCRIPTION OF SYMBOLS 10 ......... Grinding device, 12 ......... Base, 14 ......... Stage, 16 ... X-axis mechanism, 16a ... Guide rail, 16b ... Ball screw, 16c ... X-axis motor, 18 ... ...... X-axis stage, 18a ......... sliding part, 20 ......... Y-axis mechanism, 20a ......... guide rail, 20b ......... ball screw, 20c ......... Y-axis motor, 22 ......... Y-axis stage , 22a ......... Sliding part, 24 ......... Grip mechanism, 24a ......... Fixed abutment plate, 24a1 ......... Notch, 24b ......... Moving abutment plate, 24b1 ......... Notch, 24c ......... Post, 24d ......... Clamp, 26 ......... Z-axis actuator, 26a ......... Guide rail, 26b ......... Ball screw, 26c ......... Z-axis motor, 28 ......... Vertical base, 30 ......... Slider, 32 ......... bracket, 34 ......... grinding hand 36 ......... Rotating grinding wheel 38 ......... Measuring means 38a ......... Measuring pin 38a1 ......... Contact part 40 ......... Sliding mechanism 42 ......... Control means 44 ......... Input terminal, 44a ... Grinding app, 46 ... Motion control board, 46a ... X-axis driver, 46b ... Y-axis driver, 46c ... Z-axis driver, 48 ... Router controller, 50 ......... Amplifier for measuring means, 52 ......... compressor, 54 ......... regulator, 56a, 56b ......... valve, 60 ...... labyrinth packing, 62 ...... comb teeth.

Claims (5)

A stage that enables movement in the X-axis direction along the longitudinal direction of the labyrinth packing to be ground, and the Y-axis direction along the width direction of the labyrinth packing;
A gripping mechanism disposed on the stage and fixing the labyrinth packing;
Grinding means for grinding the upper surface of the comb teeth of the labyrinth packing;
A Z-axis actuator for moving the grinding means in the Z-axis direction along the height direction of the labyrinth packing;
Measuring means for measuring at least three Z-axis coordinates along the X-axis direction of the upper surface of the comb teeth for each of the plurality of comb teeth formed on the labyrinth packing;
Machining data is created based on the Z-axis coordinates measured by the measuring means and the X-axis coordinates at each measurement point, and a control signal based on the machining data is output to the stage and the Z-axis actuator. Control means;
Equipped with a,
The measurement of the Z-axis coordinate is performed with adjacent points along the X-axis,
The machining data is created by calculating an approximate arc shape from the shape of the upper surface of the comb teeth based on the coordinates of the measurement point, and grinding the predetermined upper surface of the comb teeth by the grinding means based on the arc shape. A comb-teeth height grinding apparatus for labyrinth packing, characterized in that machining data for grinding with a quantity is created . The gripping mechanism has a fixed abutment plate fixed on the stage, a movable abutment plate disposed to face the fixed abutment plate, and a support column for guiding the operation of the movable abutment plate,
2. The comb tooth height of the labyrinth packing according to claim 1 , wherein an arrangement height of the labyrinth packing is determined with the support as a base point, and the labyrinth packing is gripped by the fixed abutment plate and the movable abutment plate. Grinding machine. The comb-teeth height grinding device for labyrinth packing according to claim 2 , wherein the fixed abutment plate and the movable abutment plate are provided with arc-shaped notches following the arc of the labyrinth packing. . It said measuring means is provided in a slider which is attached to the Z-axis actuator, in any one of claims 1 to 3, characterized in that there is a moving configuration capable of measuring position and a retracted position Comb height grinding device for labyrinth packing as described. The measuring means is a contact-type measuring means provided with a measuring pin having a linear contact portion that is larger than the width of the upper surface of the comb teeth and smaller than the pitch between the plurality of comb teeth arranged in parallel. The comb-teeth height grinding apparatus for labyrinth packing according to any one of claims 1 to 4 .

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