JP2020019084A - Apparatus and method for grinding comb-tooth height of labyrinth packing - Google Patents

Abstract

To provide an apparatus for grinding the comb-tooth height of a labyrinth packing, in which automation is applied also to a position of a measuring point to be a reference, and human-induced variation related to processing can be suppressed more.SOLUTION: An apparatus for grinding the comb-tooth height of a labyrinth packing includes: a stage 14 allowing movement in an X-axis direction and a Y-axis direction, in a state that a labyrinth packing is fixed; grinding means 34 for grinding comb-teeth; first measuring means for measuring a chord length of the labyrinth packing; second measuring means 38 for measuring a Z-axis coordinate of three points to be a reference; and control means for determining X-axis coordinates of the three points, on the basis of the chord length measured by the first measuring means, for creating processing data for executing grinding, on the basis of the X-axis coordinate at each measuring point, after executing the measurement using the second measuring means 38 and the Z-axis coordinate has been measured using the second measuring means 38, and for outputting a control signal based on the processing data.SELECTED DRAWING: Figure 1

Description

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

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

  Conventionally, the work of repairing the comb-shaped fins has been performed manually by an operator due to the peculiarity of the form. However, depending on the skill of the worker, there is a large difference in the finish of the repair processing and the processing time. Was out.

  For this reason, as a technology for automating the correction processing of the labyrinth packing, there is provided a stage for holding and horizontally moving a workpiece and a mechanism for vertically moving a rotary tool as disclosed in Patent Document 1. In addition, an apparatus has been proposed in which a stage is moved in a longitudinal direction of a workpiece and a rotary tool is moved in a width direction of the workpiece, as disclosed in Japanese Patent Application Laid-Open No. H11-163873. However, in the conventional processing apparatus, since the size and the curvature of the labyrinth packing that can be processed are determined, it is not possible to cope with the correction processing of the workpiece in a different state.

  On the other hand, the present applicant has proposed an apparatus as disclosed in Patent Document 3. The apparatus disclosed in Patent Document 3 includes a stage that can move horizontally while holding a labyrinth packing to be processed, and a grinding unit that can move in the vertical direction, and a Z-axis measured by measuring at least three points. Processing data is created based on the coordinate data of the (height axis), and the comb-shaped fins in the labyrinth packing are ground.

JP-A-7-60630 JP-A-2002-273644 Japanese Patent No. 6304614

  According to the technique disclosed in Patent Literature 3, it is possible to perform grinding of comb-shaped fins regardless of the size and curvature of the labyrinth packing to be processed.

  However, the technique disclosed in Patent Literature 3 allows the operator to arbitrarily select a point for detecting the coordinate of the Z axis. For this reason, the measurement position may be shifted toward the center or toward the outside depending on the operator.

  Therefore, in the present invention, a comb tooth height grinding device for a labyrinth packing and a comb tooth height grinding method for a labyrinth packing that can also automate the position of a reference measurement point and further suppress artificial variation in processing. The purpose is to provide.

  In order to achieve the above object, a comb tooth height grinding apparatus for a labyrinth packing according to the present invention comprises: a labyrinth packing to be ground; A stage enabling movement in the Y-axis direction along the width direction of the labyrinth packing, grinding means for grinding comb teeth of the labyrinth packing, first measuring means for measuring a chord length of the labyrinth packing, and A second measuring means for measuring three Z-axis coordinates along the X-axis; and a three-point measuring means for measuring the Z-axis coordinate by the second measuring means based on the chord length measured by the first measuring means. After calculating the X-axis coordinate, outputting a control signal for executing the measurement by the second measuring means, and measuring the Z-axis coordinate by the second measuring means, each measuring point Control means for creating processing data for grinding the upper surface of the comb teeth with a predetermined grinding amount on the basis of the X-axis coordinates in the X-axis coordinates, and outputting a control signal based on the processing data. I do.

  In addition, the comb tooth height grinding device of the labyrinth packing having the above-described features includes a deburring means made of an abrasive material that contacts the top side surface of the comb tooth while rotating according to a control signal based on the processing data. And good. According to this feature, it is possible to automatically perform the deburring work which has been manually performed in the past.

  Further, in the comb tooth height grinding device for a labyrinth packing having the above-mentioned characteristics, it is preferable that the abrasive is flexible. With such a feature, burrs generated on the vertex side surfaces of the comb teeth can be effectively eliminated.

  In addition, the comb tooth height grinding device for a labyrinth packing having the above-described features includes a first Z-axis actuator for moving the grinding unit in a Z-axis direction along the height direction of the labyrinth packing, and the deburring unit. A second Z-axis actuator for moving in the Z-axis direction, wherein the control signal for the deburring means is a shift amount between the first Z-axis actuator and the second Z-axis actuator for the machining data. It is also possible to adopt a configuration in which the output is added. According to this feature, deburring can be performed without newly creating processing data for controlling the deburring means.

  Furthermore, in the comb tooth height grinding device for a labyrinth packing having the above-described features, the second Z-axis actuator may be a detachable unit. According to this feature, the grinding device can be an extended device.

  In order to achieve the above object, the method for grinding comb tooth height of a labyrinth packing according to the present invention includes: disposing a grinding means for grinding comb teeth of a labyrinth packing; and a burr on a processing surface after the grinding. The processing data of the grinding means and the processing data of the deburring means when the arrangement position of the deburring means for removing is deviated in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction. Is characterized in that one piece of processing data is used by correcting a relative deviation between the two.

  According to the apparatus and the method for grinding the height of comb teeth of a labyrinth packing having the above-mentioned features, it is possible to perform a grinding process irrespective of the curvature, size and state of the labyrinth packing. For this reason, it is possible to perform the correction processing with high accuracy in a short time without depending on the skill of the operator. In addition, by automating the calculation of the three reference measurement points, it is possible to further suppress artificial variations in processing.

It is a front view showing the appearance composition of the comb tooth height grinding device of the labyrinth packing concerning an 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 showing the appearance composition of the comb tooth height grinding device of the labyrinth packing concerning an embodiment. FIG. 3 is an enlarged side view illustrating a configuration of a gripping mechanism. FIG. 3 is an enlarged front view illustrating a configuration of a gripping mechanism. FIG. 4 is a partially enlarged view showing a relationship between a rotating brush and comb teeth in a deburring means for removing a burr generated in a labyrinth packing after grinding. FIG. 4 is a partially enlarged view showing a relationship between comb teeth of a labyrinth packing and measuring pins in a measuring 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 including a control means. It is a flowchart which shows the process at the time of performing the comb tooth grinding of the labyrinth packing by the comb tooth height grinding apparatus of the labyrinth packing which concerns on embodiment. It is a figure showing an example of a measurement route at the time of automatically measuring three Z-axes in labyrinth packing.

  Hereinafter, embodiments of a comb tooth height grinding apparatus for a labyrinth packing and a comb tooth height grinding method for a labyrinth packing according to the present invention will be described in detail with reference to the drawings. 1 to 3 are a front view, a left side view, and a plan view illustrating an external configuration of a comb tooth height grinding device for a labyrinth packing according to the embodiment. FIG. 4 is an enlarged side view showing the configuration of the gripping mechanism, and FIG. 5 is a front view of the same. FIG. 6 is a partially enlarged view showing the relationship between the rotating brush and the comb teeth in the deburring means for removing burrs generated in the labyrinth packing after the grinding process. FIG. 7 is a partially enlarged view showing the relationship between the comb teeth of the labyrinth packing and the measuring pins of the measuring means. FIG. 8 is a block diagram showing an image of the entire system of the comb tooth height grinding device for labyrinth packing including the control means. Further, FIG. 9 is a flowchart showing a process when the comb tooth grinding of the labyrinth packing is performed by the comb tooth height grinding device of the labyrinth packing according to the embodiment. FIG. 10 is a diagram illustrating an example of a measurement route when automatically measuring three Z-axes in the labyrinth packing.

[Configuration of grinding device]
A labyrinth packing comb height grinder (hereinafter, simply referred to as a grinder 10) according to the embodiment includes a base 12, a stage 14, a grinding unit 34, a first Z-axis actuator 26, a deburring unit 70, and a second Z-axis. An actuator 74, a first measuring unit, a second measuring unit 38, and a control unit 42 are provided. The base 12 is a base of the grinding device 10 according to the 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 as a workpiece is provided. In this 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 arranged along the X-axis, a ball screw 16b, and an X-axis motor 16c for rotating the ball screw 16b. The X-axis stage 18 is a slider that moves with the rotation of the ball screw 16b, and has a sliding portion 18a along the guide rail 16a.

  The Y-axis mechanism 20 includes, on the X-axis stage 18, a guide rail 20a arranged along the Y-axis, a ball screw 20b, and a Y-axis motor 20c for rotating the ball screw 20b. The Y-axis stage 22 is a slider that moves with the rotation of the ball screw 20b, and has a sliding portion 22a along the guide rail 20a. On the Y-axis stage 22, a gripping mechanism 24 is provided.

[Gripping mechanism]
The gripping mechanism 24 is a means for fixing the labyrinth packing 60. In the grinding device 10 according to the embodiment, the gripping mechanism 24 includes a fixed abutment plate 24a, a movable abutment 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 abutment plate 24b is a member arranged to face the fixed abutment plate 24a and serving to sandwich the labyrinth packing 60 between the fixed abutment plate 24a and the movable abutment plate 24b. The column 24c is a slide guide for the movable abutment plate 24b, which extends along the Y-axis direction with the fixed abutment plate 24a as a base point and is arranged to penetrate the movable abutment plate 24b. In the case of the present embodiment, two pairs of columns 24c are provided along the X axis.

  In this 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 arc shapes of the notches 24a1 and 24b1 may follow the arc shape of the labyrinth packing 60 to be ground. By providing arc-shaped notches 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 achieved. Further, the arcs forming the notches 24a1 and 24b1 may be formed in accordance with the arc of the labyrinth packing 60 having a large overall diameter. By forming the notches 24a1 and 24b1 in accordance with the large arc, it becomes possible to cope with the labyrinth packing 60 having a small diameter.

  In addition, by setting the arrangement height of the columns 24c arranged in pairs with the grip height of the labyrinth packing 60, the arrangement height of the labyrinth packing 60 can be determined based on the columns 24c. Therefore, the labyrinth packing 60 can be easily arranged (positioned).

  The clamp 24d has a role of pressing the movable abutment plate 24b holding the labyrinth packing 60 against the fixed abutment plate 24a and maintaining the labyrinth packing 60 in a fixed state. The clamp 24d is not limited to a specific configuration as long as it plays a role, and may be, for example, a shaman. In the present embodiment, in consideration of the easiness of the process of gripping the labyrinth packing 60, a toggle clamp of a lateral pressing type 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 abutment plate 24b, it is possible to perform the pressing and releasing according to the swing of the lever. In the present 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 the present embodiment, a router is selected as the grinding means 34, and the router is attached to a slider 30 of a first Z-axis actuator 26, which will be described later, so that relative operation with respect to three axes such as X, Y, and Z axes is possible. Configuration.

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

[First Z-axis actuator]
The first Z-axis actuator 26 is an element responsible for an operation on a movement axis (Z-axis) in a direction (vertical direction) orthogonal to both the X-axis and the Y-axis. The configuration of the first Z-axis actuator 26 can be basically the same as the X-axis mechanism 16 and the Y-axis mechanism 20. That is, a guide rail 26a disposed along a vertical base 28 erected along the Z-axis direction with the base 12 as a base point, a power unit including a ball screw 26b and a first Z-axis motor 26c, and a rotation of the ball screw 26b. It has a slider 30 that moves with it, 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 first Z-axis motor 26c.

[Deburring means]
The deburring means 70 is an element for removing burrs 62 a generated on the upper surface of the comb teeth 62 after being ground by the grinding means 34. In the present embodiment, the deburring means 70 is a router provided with a rotating brush 72 made of a ceramic brush. In the present embodiment, the deburring means 70 is attached to a slider 76 of a second Z-axis actuator 74 described later. With such a configuration, the deburring means 70 can perform relative operations with respect to three axes such as the X axis, the Y axis, and the Z axis, similarly to the grinding means 34.

  The deburring means 70 is arranged with respect to the slider 76 of the second Z-axis actuator 74 so that the rotation axis of the rotating brush 72 is along the Y-axis. As shown in FIG. 6, by rotating the rotating brush 72 of the deburring means 70 so as to bite into the tip of the comb tooth 62, the brush separates along the tip of the comb tooth 62, and the burr 62a generated on the upper surface is removed. Can be dispelled.

  Here, in the present embodiment, as an example of the simple and effective deburring means 70, the rotary brush 70 made of a ceramic brush is taken as an example. However, as the deburring means, any abrasive material such as a grindstone may be used as long as it comes into contact with the top side surface of the comb teeth 62 and exhibits a deburring effect. Further, as an element having the same effect as that of the rotating brush 70, a flexible abrasive may be employed. For example, in addition to the above-described rotating brush 70, any structure may be used as long as a cloth abrasive, a paper abrasive, or the like is brought into rotational contact.

[Second Z-axis actuator]
Like the first Z-axis actuator 26, the second Z-axis actuator 74 is an element responsible for an operation with respect to a movement axis (Z-axis) in a direction (vertical direction) orthogonal to both the X-axis and the Y-axis. The configuration of the second Z-axis actuator 74 can be basically the same as that of the X-axis mechanism 16 or the Y-axis mechanism 20, similarly to the first Z-axis actuator 26. That is, a guide rail 76a disposed along a vertical base 78 erected along the Z-axis direction with the base 12 as a base point, a power unit including a ball screw 76b and a second Z-axis motor 76c, and a rotation of the ball screw 76b. A slider 76 that moves with the slider 76 is provided, and a bracket 80 is attached to the slider 76. With such a configuration, the slider 76 can be moved along the Z-axis by a control signal to the second Z-axis motor 76c.

[About the first measuring means]
The first measuring means is an element for measuring the length of the chord in the labyrinth packing 60 and automatically recognizing the set position of the labyrinth packing 60 gripped by the gripping mechanism 24. It is constituted by the axis stage 18 and the laser displacement meter 82 attached to the bracket 32 provided on the slider 30 of the first Z-axis actuator 26. When the stage 14 is moved in the X-axis direction while measuring the distance in the Z-axis direction with the laser displacement meter 82 to obtain the coordinates (movement distance), the X between the two points where the distance in the Z-axis direction becomes the shortest is obtained. The axial distance is the chord length of the labyrinth packing 60.

Further, based on the length of the distance in the Z-axis direction, the center position and width of the labyrinth packing 60, the degree of inclination at the time of installation, and the like can also be calculated.
By measuring the chord length in the labyrinth packing 60, it becomes possible to automatically obtain the X-axis coordinates of three points for measuring the Z-axis coordinates in the second measuring means 38, which will be described in detail later. For example, as shown in FIG. 5, one point having the longest Z-axis distance measured by the laser displacement meter 82 (for example, point A) is shifted from the one point by a predetermined distance in the X-axis direction with respect to this point. One point (for example, point B) and one point (for example, point C) located on the X-axis coordinate line-symmetrically with point B with the line connecting the laser displacement meter and point A as an axis. Can be sought.

  When the stage 14 is moved in the Y-axis direction while measuring the distance in the Z-axis direction with the laser displacement meter 82 to obtain the coordinates (movement distance), the Y of the valley portion of the distance measurement trajectory in the Z-axis direction is obtained. The interval between the axial positions is the pitch interval between the comb teeth 62 in the labyrinth packing 60.

[About the second measuring means]
The second measuring means 38 is an element for measuring the Z-axis coordinate of the upper surface of the comb teeth 62 in the labyrinth packing 60. In the present embodiment, the second measuring means 38 is attached to the bracket 32 provided on the slider 30 of the first Z-axis actuator 26. ing. By measuring the Z-axis coordinate of the upper surface of the comb teeth 62 in the labyrinth packing 60 by the second measuring means 38, a zero point at the time of performing grinding can be derived. Also, 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. This makes it possible to determine the relative movement path of the grinding means 34 in the relationship between the first Z-axis actuator 26 and the X-axis mechanism 16.

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

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

  Further, in the present embodiment, the contact-type second measuring means 38 is employed because the measuring 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. As shown in FIG. 7, the measuring pin 38a of the second measuring means 38 has a linear contact portion 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. 38a1 is adopted, and the linear portions are arranged in a direction intersecting with the extending direction of the comb teeth 62. With 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. 7).

[About control means]
The control means 42 (see FIG. 8) includes the stage 14, the first Z-axis actuator 26, the second Z-axis actuator 74, the grinding means 34, the deburring means 70, the laser displacement meter 82, the second measuring means 38, the slide mechanism 40 and the like. It has the role of performing operation control. Then, under the control of the control means 42, an operation is performed in which the upper surface of the comb teeth 62 in the labyrinth packing 60 is ground by the grinding means 34, and the burr 62a generated on the upper surface of the comb teeth 62 after grinding is removed by the deburring means 70. . FIG. 8 shows an example of the configuration of the control means 42 applied to the grinding device 10 and the deburring means 70 according to the embodiment. The control unit 42 receives predetermined element data. The input of the element data is performed via an input terminal 44 such as a control PC attached to the control means 42. In addition, the input terminal 44 only needs to store a program (for example, a grinding application 44a) for controlling elements such as the grinding device 10 and the deburring unit 70.

  The control means 42 includes a motion control board 46, a first router controller 48, a second router controller 49, an amplifier 50 for measuring means, and the like as interfaces for transmitting and receiving control signals to and from the input terminal 44. I have. The motion control board 46 is an element for controlling the stage 14, the first Z-axis actuator 26, and the second Z-axis actuator 74 in the grinding device 10, and includes an X-axis driver 46a, a Y-axis driver 46b, a first Z-axis driver 46c, Further, a control signal (drive pulse) for drive control is generated and output via the second Z-axis driver 46d. The X-axis motor 16c, the Y-axis motor 20c, the first Z-axis motor 26c, and the second Z-axis motor 76c are rotated according to control signals output from the drivers (46a to 46d).

  The first router controller 48 is an element for controlling the grinding means 34. The first router controller 48 outputs a signal for controlling the number of revolutions of the rotating grindstone 36 in the grinding means 34.

  The second router controller 49 is an element for controlling the operation of the deburring unit 70. The second router controller 49 outputs a signal for controlling the rotation speed of the rotating brush 72 in the deburring unit 70.

  A regulator 54 for adjusting the supply pressure of compressed air and valves 56a and 56b are provided between the compressor 52, the second measuring means 38, and the slide mechanism 40. The valves 56a and 56b may be switching valves such as electromagnetic valves, and open a supply path of compressed air by inputting a control signal from a controller (not shown) or the like. As a result, position control of the measurement pin 38a in the measurement means 38, switching control between the measurement position and the retreat position in the slide mechanism 40, and the like are performed. Specifically, the compressed air supplied from the compressor 52 to the measuring means 38 has a role of extending the measuring pin 38a of the measuring means 38 to the standby state. The compressed air supplied from the compressor 52 to the slide mechanism 40 has a role of moving the second measuring means 38 from the retracted position to the measured position.

  The measuring unit amplifier 50 has a role of amplifying the electric signal output from the second measuring unit 38 due to the measurement of the comb teeth 62 in the labyrinth packing 60 and outputting the amplified electric signal to the input terminal 44 as a detection signal.

  Further, in this embodiment, a laser amplifier 58 for controlling the laser displacement meter 82 constituting the first measuring means is provided. Here, the laser amplifier 58 may be configured to be incorporated in the control means 42.

[About grinding control]
Hereinafter, the grinding of the comb teeth 62 in the labyrinth packing 60 by the grinding device will be described with reference to FIG. 9 together with the description of the above-described element data.

  First, the labyrinth packing 60 as a work is set on the gripping mechanism 24 (step 10). After the labyrinth packing 60 is set on the gripping mechanism 24, the first measuring means constituted by the stage 14 and the laser displacement meter 82 is operated to automatically recognize the setting position of the labyrinth packing 60 (step 20).

  After calculating the set position of the labyrinth packing 60 based on the value measured by the first measuring means, the set value (element data) of the processing condition is input to the control means 42. The data necessary for the grinding of the labyrinth packing 60 include the number of cracks in the packing, the bow size (chord length), the number of comb teeth, the comb tooth pitch, the starting measurement point, and the designated processing amount. Data such as the number of cracks, bow size, number of comb teeth, comb tooth pitch, start measurement point, etc. can be calculated based on the measured values by the means. Therefore, the set value of the processing condition input by the operator is about the designated processing amount. By reducing the input requirements by the operator, processing defects due to input errors can be suppressed.

  The number of cracks is the number of divisions of the labyrinth packing 60. The labyrinth packing has a circular shape corresponding to the shaft diameter of a turbine (not shown). Become one. Further, since the division is made equally, 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 surface of the comb teeth 62 of the labyrinth packing 60 to be ground, that is, the length (chord length) of the chord of the arc. By calculating or inputting the bow size, the moving distance of the X-axis in one grinding can be obtained. The inner angle of the vertex located at the base of the isosceles triangle having the bow as the base and the center of the circle as the vertex is obtained from the number of cracks. Therefore, by obtaining the bow size, the length of two sides forming the isosceles triangle (the radius R of the arc forming the labyrinth packing) can be obtained. Specifically, it can be obtained by calculating a / (2 × cos θ), where a is the length of the base, and θ is the interior angles 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 for determining the number of times of grinding. In addition, the comb tooth pitch is an arrangement interval of the comb teeth 62 along the Y-axis direction. This is for determining the moving distance of the rotary grindstone (grinding means) in the Y-axis direction when each comb tooth 62 is ground.

  The start measurement points are the XY coordinates of three points on the comb teeth 62 to be processed first, and the designated processing amount is the grinding amount for grinding the upper surface of the comb teeth 62 (step 30).

  The control means 42 to which such element data has been input first supplies compressed air to the slide mechanism 40 and the measuring means 38, moves the measuring means 38 to the measuring position, and extends the measuring pin 38a. To enter standby mode. Thereafter, the X-axis motor 16c, the Y-axis motor 20c, and the first Z-axis motor 26c are moved along the radius R of the upper surface of the comb teeth 62 of the labyrinth packing 60 calculated based on the set position automatically recognized in step 20. Then, a control signal is given thereto, and measurement of the Z-axis coordinates of three points at the upper surface position of the comb teeth 62 by the measuring means 38 is performed. Then, the radius of curvature 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.

  Here, the Z-axis coordinate is measured at three points for each comb tooth. In the present embodiment, as shown in FIG. 10, the Z at the common point (first point) of the plurality of comb teeth 62 is set along the arrangement direction of the comb teeth 62 (Y-axis direction: direction indicated by arrow B). After measuring the respective axis coordinates, it is moved in the X-axis direction (the direction indicated by arrow A) to measure the second Z-axis coordinate. Further, it moves in the X-axis direction and measures the Z-axis coordinate of the third point. As described above, by measuring the Z-axis coordinates while moving the stage 14 in a zigzag shape, the number of movements in the X-axis direction can be reduced as compared with the case where three points are measured for each comb tooth. The measurement time can be reduced (step 40).

  After the radius of curvature of the upper surface of the comb teeth 62 is obtained, the machining path, the operation amounts of the X-axis motor 16c, the Y-axis motor 20c, and the first Z-axis motor 26c, and the grinding are determined based on the input element data and the calculated radius of curvature. Processing data such as the rotation speed of the means 34 is created (step 50).

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

  After the grinding step is completed, the second measuring means 38 is moved to the measuring position again, and the measurement of the Z-axis coordinates of the three points measured in the measuring step is performed. Then, the processing amount is calculated based on the measured value before the grinding step and the measured value after the grinding step (step 70). It is determined whether the calculated machining amount is a value approximating the designated machining amount. Here, the approximation range may be a range of a threshold value predetermined according to the required processing accuracy (step 80).

  If it is determined that the processing amount is within the range of the threshold value, the grinding of the labyrinth packing 60 ends. On the other hand, if the processing amount is out of the range of the threshold value, a processing amount based on the remaining processing amount is obtained (step 90), and the process returns to step 50, where processing data is created and the labyrinth packing 60 is ground. You. Here, factors that cause the machining amount to be outside the threshold range include wear of the rotating grindstone 36, escape of the rotating shaft in the grinding means 34, and the fact that the machining amount itself is larger than the grinding amount of the grinding tool. it can. Therefore, if necessary, the dimensions of the rotary grindstone 36 and the mounting state of the grinding means 34 may be checked before reworking, and the necessity of reinput of the element data may be determined.

  When the grinding is completed in step 80, an operation of removing burrs generated on the processing surface of the labyrinth packing 60 by the grinding is performed. Deburring is performed by the deburring means 70 using the processing data used in the grinding. By comparing the X-axis coordinate, the Y-axis coordinate, and the Z-axis coordinate of the rotary brush 72 provided in the deburring means 70 with the rotary grindstone 36, a difference amount for each coordinate is obtained. Is given as the shift amount in each axis direction to the machining data, the machining data can be used.

[Effects]
According to the grinding device 10 as described above, the grinding process can be performed regardless of the curvature, the size, and the state of the labyrinth packing 60. For this reason, it is possible to perform the correction processing with high accuracy in a short time without depending on the skill of the operator. In addition, by automating the calculation of the three reference measurement points, it is possible to further suppress artificial variations in processing.

  In the above-described embodiment, it is described that the rotating grindstone 36 is used for the grinding process. However, in the grinding device 10 according to the present embodiment, a superhard tool capable of rotary grinding may be used instead of the rotary grindstone 36. By using a carbide tool, clogging hardly occurs as compared with a grindstone, and a large amount of grinding can be performed in one processing. In addition, since the wear of the tool is small, it is possible to reduce the trouble such as changing the element data.

  In the above-described embodiment, the first Z-axis actuator 26 and the second Z-axis actuator 74 are described as actuators that perform the operation in the Z-axis direction. The second Z-axis actuator 74 includes the deburring unit 70. The configuration was adopted. Here, in the grinding device 10 according to the present invention, the second Z-axis actuator 74 may be detached from the base 12 depending on whether or not the deburring means 70 is required. Furthermore, if there is not enough space for a working tool or the like to be operated in the Z-axis direction, third and fourth Z-axis actuators (not shown) are arranged on the base 12, and an extended grinding device is used. It may be configured.

10 Grinding device 12 Base 14 Stage X-axis mechanism 16a Guide rail 16b Ball screw 16c X-axis motor 18 ... X-axis stage, 18a sliding section, 20 Y-axis mechanism, 20a guide rail, 20b ball screw, 20c Y-axis motor, 22 Y-axis stage , 22a ... sliding part, 24 ... gripping mechanism, 24a ... fixed abutment, 24a1 ... notch, 24b ... movable abutment, 24b1 ... notch, 24c ... Support, 24d Clamp, 26 First Z-axis actuator, 26a Guide rail, 26b Ball screw, 26c First Z-axis motor, 28 Vertical base, 30 Slider, 32 ... Bracket, 34 ... Grinding means 36 Rotating stone 38 Second measuring means 38a Measurement pin 38a1 Contact part 40 Slide mechanism 42 Control means 44 Input terminal, 44a Grinding application, 46 Motion control board, 46a X-axis driver, 46b Y-axis driver, 46c First Z-axis driver, 46d Second Z Axis driver, 48 First router controller, 49 Second router controller, 50 Amplifier for measuring means, 52 Compressor, 54 Regulator, 56a, 56b Valve 58 laser amplifier, 60 labyrinth packing, 62 comb teeth, 62a burr, 70 burr removing means, 72 rotating brush, 74 second Z axis A Chuator, 76 Slider, 76a Guide rail, 76b Ball screw, 76c Second Z-axis motor, 78 Vertical base, 80 Bracket, 82 Laser displacement meter .

In order to achieve the above object, a comb tooth height grinding apparatus for a labyrinth packing according to the present invention comprises: a labyrinth packing to be ground; A stage enabling movement in the Y-axis direction along the width direction of the labyrinth packing, grinding means for grinding comb teeth of the labyrinth packing, first measuring means for measuring a chord length of the labyrinth packing, and A second measuring means for measuring three points along the X-axis, which is a Z-axis coordinate which is a coordinate in the Z-axis direction along the height direction, and the second measuring means based on a chord length measured by the first measuring means. The X-axis coordinates of three points at which the Z-axis coordinates are measured by the measuring means are determined, and a control signal for executing the measurement by the second measuring means is output. After the coordinates are measured, processing data for grinding the upper surface of the comb teeth with a predetermined grinding amount is created based on the X-axis coordinates at each measurement point, and a control signal based on the processing data is output. Control means, a first Z-axis actuator for moving the grinding means in the Z-axis direction, and a detachable unit, which contact the top side surface of the comb teeth while rotating according to a control signal based on the processing data. A second Z-axis actuator for moving deburring means made of an abrasive in the Z-axis direction, at least the stage, and the first Z-axis actuator are provided, and a detachable space for the second Z-axis actuator is provided. And a base that is provided.

In comb tooth height grinding apparatus labyrinth packing having the features as described above, in accordance with a control signal based on the processed data, by providing a deburring means consists abrasive in contact with the top side of the comb teeth while rotating In addition, it is possible to automatically perform the deburring work that has been performed manually in the past.

Also, in the comb tooth height grinding device for labyrinth packing having the above characteristics, when the second Z-axis actuator is attached to the base, a control signal for the deburring means is: it can be taken into account to configure output the shift amount between the first 1Z axis actuator and said second 2Z axis actuator. According to this feature, deburring can be performed without newly creating processing data for controlling the deburring means.

Furthermore, in the comb tooth height grinding device for the labyrinth packing having the above characteristics, the second Z-axis actuator is a detachable unit, so that the grinding device can be an extended device.

In order to achieve the above object, a comb tooth height grinding apparatus for a labyrinth packing according to the present invention comprises: a labyrinth packing to be ground; , A stage enabling movement in the Y-axis direction along the width direction, grinding means for grinding a plurality of comb teeth arranged along the width direction of the labyrinth packing, and a first for measuring a chord length of the labyrinth packing. Measuring means, second measuring means for measuring three points along the X-axis, which are coordinates in the Z-axis direction along the height direction of the labyrinth packing, and strings measured by the first measuring means Based on the length, the X-axis coordinates of three points for measuring the Z-axis coordinates by the second measuring means are determined, and a control signal for executing the measurement by the second measuring means is output. After the Z-axis coordinate is measured by the second measuring means, processing data for grinding the upper surface of the comb teeth with a predetermined grinding amount is created based on the X-axis coordinate at each measurement point, and the processing data Control means for outputting a control signal based on the machining data, a first Z-axis actuator for moving the grinding means in the Z-axis direction, and a detachable unit, wherein the comb rotates while rotating in accordance with the control signal based on the processing data. A second Z-axis actuator for moving, in the Z-axis direction, deburring means made of abrasive material in contact with the top side surface of the tooth; at least the stage; and the first Z-axis actuator; and a base desorption space is provided, the control signal to execute the measurement by the second measuring means, the plurality of the comb teeth After measuring the Z-axis coordinate of the first point along the Y-axis direction, moving in the X-axis direction and measuring the Z-axis coordinate of the second point along the Y-axis direction, respectively. The signal is a signal for moving in the X-axis direction and measuring a third Z-axis coordinate along the Y-axis direction .

Claims (6)

With the labyrinth packing to be ground fixed, a stage enabling movement in the X-axis direction along the longitudinal direction of the labyrinth packing and the Y-axis direction along the width direction of the labyrinth packing,
Grinding means for grinding the comb teeth of the labyrinth packing,
First measuring means for measuring a string length of the labyrinth packing;
Second measuring means for measuring Z-axis coordinates of three points along the X-axis in the labyrinth packing;
Based on the chord length measured by the first measuring means, the X-axis coordinates of three points for measuring the Z-axis coordinates by the second measuring means are determined, and a control signal for executing the measurement by the second measuring means is output. Then, after the Z-axis coordinate is measured by the second measuring means, processing data for grinding the upper surface of the comb teeth with a predetermined grinding amount is created based on the X-axis coordinate at each measurement point, Control means for outputting a control signal based on the processing data, the comb tooth height grinding device for labyrinth packing.   2. Comb tooth height grinding of a labyrinth packing according to claim 1, further comprising a deburring means made of an abrasive material which comes into contact with the top side surface of said comb teeth while rotating according to a control signal based on said processing data. apparatus.   The apparatus for grinding comb height of a labyrinth packing according to claim 2, wherein the abrasive has flexibility. A first Z-axis actuator for moving the grinding means in a Z-axis direction along a height direction of the labyrinth packing;
A second Z-axis actuator for moving the deburring means in the Z-axis direction,
The control signal for the deburring means is configured to be output in consideration of a shift amount between the first Z-axis actuator and the second Z-axis actuator with respect to the processing data. 4. The comb tooth height grinding device for labyrinth packing according to 2 or 3.   The comb height grinding device for labyrinth packing according to claim 4, wherein the second Z-axis actuator is a detachable unit. The arrangement position of the grinding means for grinding the comb teeth of the labyrinth packing and the arrangement position of the deburring means for removing burrs on the processed surface after the grinding are in the X-axis direction, the Y-axis direction, and the Z-axis direction. In at least one direction,
A method for grinding comb tooth height of a labyrinth packing, wherein the processing data of the grinding means and the processing data of the deburring means are used by adding one processing data to the relative deviation between the two. .

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