JP5101215B2 - Cutting jig - Google Patents

Description

  The present invention provides a labyrinth of a labyrinth ring that seals between a workpiece, such as a fin group provided with a heat exchanger, a turbine rotor shaft, and a passenger compartment, in which narrow uneven portions are formed along a side surface or a peripheral surface. The present invention relates to a cutting jig capable of cutting a seal or the like with a simple apparatus configuration with high accuracy.

  2. Description of the Related Art Conventionally, a labyrinth ring having a labyrinth seal is attached to an inner peripheral surface in order to seal a casing penetration portion of a rotor shaft of a steam turbine or a gas turbine. FIG. 7 shows the configuration of the rotor shaft end of the gas turbine disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 10-8993). In FIG. 7, a seal case 05 is fixed to an end surface of a casing 02 that surrounds an end portion of a rotor shaft 01 of a gas turbine, and an expansion difference sensor 06 is provided at this end portion so as to face the end surface of the rotor shaft 01. Yes.

  The differential expansion sensor 06 electrically communicates with the servo motor 07, and the servo retainer 08 moves the seal retainer 08 in the axial direction in accordance with the amount of differential expansion detected by the differential expansion sensor 06. The seal retainer 08 holds a labyrinth ring 03 having a labyrinth seal on the inner peripheral surface, and performs an effective seal by maintaining the contact length of the labyrinth seal regardless of the amount of difference in elongation. A space 09 for introducing steam for cooling the turbine rotor blade (not shown) is provided inside the seal case 05, and the steam is guided from the space 09 through the space 010 in the rotor shaft 01 to the turbine rotor blade. .

  FIG. 8A is an enlarged cross-sectional view of a seal portion to which the labyrinth ring 03 is attached, and FIG. 8B is a partially enlarged cross-sectional view thereof. In FIG. 8, an annular labyrinth ring 03 having a labyrinth seal 04 is attached to a portion where the rotor shaft 01 passes through the wall portion of the casing 02. The labyrinth seal 04 is a kind of non-contact seal that seals a fluid by providing a minute gap gap (labyrinth) between two surfaces to be sealed. The fluid pressure head is a gap difference with this minute gap. The pressure is reduced by the friction loss at the part, the squeezing effect, etc., and the seal is made. In order to provide a staggered gap, the rotor shaft 01 is provided with a convex part 01a and a concave part 01b.

  The fins 04a of the labyrinth seal 04 are composed of a plurality of disc-shaped protrusions having different heights in the narrow space n. That is, a plurality of long fins 04b having a long length and short fins 04c having a short length are alternately arranged. A gap t between the tip of the fin 04a and the rotor shaft 01 is a minute gap of 1 mm or less. In addition, since the rotor shaft 01 generates an axial thermal expansion difference of 5 to 6 mm at a high temperature with respect to the width l of the recess 01b, the tip of the fin 04a may come into contact with the side wall of the recess 01b. In this case, the rotor shaft 01 may have a straight structure without providing irregularities.

  When the gap t between the fin 04a of each labyrinth seal 04 and the rotor shaft 01 is out of the planned value, it is necessary to cut the tip of the fin 04a or the jaw of the labyrinth ring 03 to correct the planned value. However, the cutting surface is an arcuate curved surface, and in particular, the tip of the short fin 4c is disposed in a narrow space n sandwiched between the long fins 4b, so that it is manually cut using a grinder or a jig. The gap t is adjusted. However, since the work is performed by the operator's sense, there may be cases where the cutting is insufficient or excessive, and the gap confirmation and adjustment work may be repeated many times. The labyrinth ring 03 is usually divided into 6 or 8 parts, and the cutting work is individually performed in the divided state.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-281387) is intended for chamfering and the like, and even if the workpiece is thin and narrow, desired processing is possible while following the shape of the workpiece with a stylus. A processing apparatus is disclosed. Hereinafter, this processing apparatus will be described with reference to FIG. In FIG. 9, a work 022 is fixed to a work gripper 021, and the work gripper 021 is rotated by a drive motor (not shown). Two cutting tips 041 and 041 are detachably attached to the tip of the spindle 035 at positions separated by 180 °.

  The cutting tip 041 is thin and has a triangular shape, and is detachably fixed to the spindle 035 by a fixing screw member 043. The cutting tip 041 includes a cutting blade 041a on each of the three surfaces. When the cutting blade 041a on one surface side is consumed, the cutting tip 041 can be reattached so that another cutting blade 041a is at the cutting position.

  A stylus 051 is attached to the lower end of the spindle 035. The stylus 051 is a bearing type, and includes an inner ring member 053 and an outer ring member 055, a plurality of balls 057 interposed therebetween, and a ring-shaped member 056 attached to the outer peripheral side of the outer ring member 055. The inner ring member 053 is fixed to the front end surface of the spindle 035 with a fixing screw member 059. With the machining apparatus having such a configuration, the spindle 035 is rotated by a drive motor (not shown), and the corner portion of the flange portion 022a of the workpiece 022 is chamfered.

Japanese Patent Laid-Open No. 10-8993 JP 2006-281387 A

  In the processing apparatus disclosed in Patent Document 2, the diameter of the spindle 035 is large, and the cutting blade 041a cannot be brought close to the short fin 4c arranged in the narrow space n like the labyrinth fin 04a. Therefore, this processing apparatus cannot cut the tip of the short fin 04c arranged in the narrow space n.

In the processing apparatus of Patent Document 2, the diameter of the spindle 035 cannot be reduced because the object is to chamfer the flange portion 022a of the workpiece 022.
In addition, when the machining device is driven by an electric motor, when load fluctuation occurs, it cannot be absorbed and stops, or because the cutting surface is uneven due to the impact of load fluctuation, chamfering is possible, It is inconvenient for cutting.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to realize a cutting jig capable of cutting a concave portion of a workpiece in which a concave and convex portion is formed in a narrow space like a fin of a labyrinth ring. And It is another object of the present invention to provide a cutting jig capable of forming a smooth cutting surface without absorbing and stopping even when a load fluctuation occurs in the cutting jig during cutting.

In order to achieve the above object, the cutting jig of the present invention comprises:
In a cutting jig for cutting a recess by allowing a cutting blade to enter a narrow space where the uneven portion is formed with respect to a workpiece in which a narrow uneven portion is formed along a side surface or a peripheral surface,
The cutting jig includes a chip mounting portion having a plurality of chip mounting bases radially projecting in a radial direction with respect to the rotation direction, a rotation shaft that rotatably supports the chip mounting portion around a central axis, It consists of multiple cutting tips removably attached to the tip mounting base,
The outer peripheral end of the cutting tip attached to the tip mounting base is located outside the outer diameter of the rotating shaft, and the distance between the outer diameter of the rotating shaft and the cutting edge of the cutting tip is the concave and convex portions of the concave and convex portions. Is greater than the distance between
Provided is a moving positioning means for positioning the tip mounting portion into a narrow space where the concave and convex portions are formed and positioning the concave portion through the rotating shaft at a position for cutting the concave portion ;
The movement positioning means includes a position adjusting member that moves the tip attaching portion forward and backward to bring the cutting tip into contact with the recess of the workpiece, and is attached to the position adjusting member. A micrometer that sets the cutting amount by bringing the cutting tip into contact with the concave portion and setting the reference position as a reference position, and further advancing the cutting tip through a contact by an amount corresponding to the cutting amount. .

By adopting such a configuration, it becomes possible to cut the recess by allowing the cutting blade to enter the narrow space in which the uneven portion is formed. Moreover, in the present invention, since the plurality of chip mounting bases project radially in the radial direction with respect to the rotation direction, it is possible to continuously perform cutting with a plurality of cutting chips. Therefore, a smooth cutting surface can be obtained, and the cutting amount added to each cutting tip can be small. Therefore, since the load applied to each cutting tip is reduced, the life of each cutting tip can be extended.
Further, the movement positioning means includes a position adjusting member that moves the tip mounting portion forward and backward to bring the cutting tip into contact with the recess of the workpiece, and is attached to the position adjusting member. And a micrometer for setting the cutting amount by further advancing the cutting tip through the contact by the amount of cutting after the cutting tip is brought into contact with the recess and set as a reference position. A precise cutting amount can be set and cutting can be performed with high accuracy.

  In the present invention, the moving positioning means includes spring force biasing means for applying a spring force in a direction in which the cutting tip is pressed against the cutting surface of the recess to be processed, and rotates via the spring force biasing means. It may be configured to support the shaft. With such a configuration, the cutting tip is always pressed against the cutting surface of the concave portion to be processed by the spring force during the cutting process, so that the cutting process is reliably performed. In addition, even if there is a load fluctuation during cutting, the cutting tip can retreat from the cutting surface against the spring force, so an excessive load is not applied to the cutting tip and the cutting tip is damaged. There is no.

Further, the positioning means, the rotary shaft and provided integrally, and said contactor in contact with the scanning surface provided in a circular arc shape of the workpiece, in a direction of pressing the contacts into surface have該倣You may comprise with the spring force urging means which provides a spring force. As a result, the contact can always be cut along the copying surface, so that the set cutting surface can be accurately formed even for the recess in the narrow space. Therefore, the cutting operation can be completed with a single cutting operation.

In the present invention, the rotating shaft may be configured to be driven to rotate by an air motor. Compared with the electric motor drive, the air motor drive can absorb the impact by the elastic force of the air even if the load fluctuates, so that the cutting process can be continued without stopping. Moreover, since pressure adjustment is easy, it is easy to control the rotational speed and rotational torque of the rotary shaft.
Further, the compressed air supply source can be easily obtained at a factory or the like, and can be easily obtained overseas regardless of the frequency of the commercial power source unlike an electric motor.

Further, in the present invention, the cutting tip has a polygonal shape, each side of the polygon individually constitutes a cutting blade, and it may be configured to be attachable to a cutting position at which any side of the polygon faces the concavo-convex portion. .
Thus, when the cutting blade on one side of the polygon is consumed, one cutting tip can be used for a long time by reattaching the other cutting blades so as to come to the cutting position. Moreover, since the cutting tip is commercially available as a general-purpose product, it can be replaced at a low cost, and the maintenance cost can be reduced.

  According to the cutting jig of the present invention, the tip mounting portion having a plurality of tip mounting bases radially projecting in the radial direction with respect to the rotation direction, and the rotation for rotatably supporting the tip mounting portion around the center axis. And a plurality of cutting tips removably attached to the tip mounting base, and an outer peripheral end of the cutting tip attached to the tip mounting base is positioned outside the outer diameter of the rotary shaft, The distance between the outer diameter of the rotating shaft and the cutting edge of the cutting tip is larger than the distance between the concave and convex portions of the concave and convex portions, and the narrow portion in which the concave and convex portions are formed through the rotary shaft. By providing a moving positioning means that enters the space and positions the concave portion at a position where the concave portion is cut, a simple and inexpensive configuration can be achieved with respect to a workpiece in which a narrow uneven portion is formed along a side surface or a peripheral surface. Easily cut the recess using a cutting jig Can Engineering, yet it is possible to form a smooth cutting surface.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the present invention to that only, unless otherwise specified.

  An embodiment in which the cutting jig of the present invention is applied to the labyrinth seal cutting will be described with reference to FIGS. FIG. 1 is a perspective view showing the entire copying apparatus according to the present embodiment, and FIG. 2 is an enlarged view showing a cutting jig of the present embodiment attached to the processing apparatus and its periphery.

  1 and 2, a rotating column 2 is erected in the vertical direction in the vicinity of one side of the fixed platen 1 provided in the horizontal direction. The rotating column 2 is configured to be rotatable around a longitudinal axis by a driving means (not shown). The horizontal fixed surface 1a of the fixed platen 1 is provided with a plurality of grooves 1b that are radially formed around the rotating column 2. Inserted into the groove 1b are a fixing jig 5a for fixing both ends of the workpiece 3 at processing positions on the fixed platen 1, and a fixing jig 5b for fixing the workpiece 3 by sandwiching the workpiece 3 from both sides in the radial direction. In this state, the workpiece 3 is fixed on the stationary platen 1 by fixing the fixing jigs 5a and 5b to the concave groove 1b.

  The workpiece 3 in the present embodiment is obtained by dividing the labyrinth ring, which is attached to the casing penetration portion of the rotor shaft of the steam turbine, into six or eight parts. The labyrinth ring 3 is provided with an L-shaped fitting portion 3a that is fitted in a groove provided on a not-shown facing surface on the passenger compartment side in the circumferential direction on the outer peripheral surface 3b, and a labyrinth seal 4 is formed on the inner peripheral side. Has been. The labyrinth seal 4 has a plurality of fins 4a protruding in the circumferential direction, and as shown in FIG. 2, long fins 4b having long lengths and short fins 4c having short lengths are alternately arranged. Therefore, a narrow space n sandwiched between the long fins 4b is formed around the short fins 4c.

  A long hole 2a is formed in the rotating column 2 in the longitudinal axis direction, and the inside is hollow. A screw rod (not shown) is arranged inside the rotary column 2 in the vertical direction. The arm 6 extends in the horizontal direction from the rotating column 2, and one end of the arm 6 is inserted into the rotating column 2 through the long hole 2 a and screwed into the screw rod. The shaft 7a of the handle 7 provided on the top of the rotating column 2 is connected to the screw rod. By rotating the handle 7, the screw rod rotates, and the arm 6 screwed to the screw rod maintains the horizontal posture. It can be moved up and down. Further, the arm 6 rotates in the horizontal direction as the rotating column 2 rotates.

  As shown in FIG. 2, a cutter attachment portion 6a is provided at the tip of the arm 6, a cutting jig 10 is attached to the lower surface of the cutter attachment portion 6a, and cutting treatment is applied to the upper surface of the cutter attachment portion 6a. A hose 8 for supplying compressed air to the tool 10 is attached. The cutter attachment portion 6a is attached to the arm 6 so that the position of the arm 6 in the longitudinal axis direction (the radial direction of the workpiece 3; the arrow j direction) can be adjusted.

  The cutting jig 10 includes a spindle 12 arranged in a vertical direction, a bearing portion 11 that rotatably supports the spindle 12, and a tip attachment portion 13 attached to the tip of the spindle 12. The cutting jig 10 incorporates an air motor 11a that is driven to rotate by compressed air supplied from the hose 8, and the spindle 12 rotates at a high speed by the rotation of the air motor 11a.

  3 and 4, the tip mounting portion 13 attached to the lower end of the spindle 12 has four tip mounting bases 13 a radially in the radial direction with respect to the rotation direction h of the tip mounting portion 13. Projected at an angle. The spindle 12 is attached to the center axis of the chip attachment portion 13. Further, a cutting tip 14 is detachably fixed to each tip mounting base 13 a by a bolt 15.

  The cutting tip 14 has a square shape, and each side of the square has a size that protrudes slightly outside the outline of the tip mounting base 13a, and any side of the square is constituted by the cutting blade 14a, so that cutting is possible. It has become. Therefore, when one cutting blade 14a is worn, it is remounted so that the other cutting blade 14a is at the cutting position. Thus, cutting can be performed while sequentially switching to all the cutting blades 14a.

  Further, the distance x between the outer peripheral end of the cutting tip 14 mounted on the tip mounting base 13a and the outer diameter of the spindle 12 is such that the cutting tip 14 can reach the short fin 4c of the labyrinth seal 4a. And the short fin 4c is formed longer than the distance y.

  In FIG. 2, a position adjusting member 20 is provided outside the cutter mounting portion 6a. A screw hole 20a is formed in the position adjusting member 20, and a position adjusting screw 21 is screwed into the screw hole 20a. By turning the handle 21a of the position adjusting screw 21, the distance between the cutter mounting portion 6a and the position adjusting member 20 can be finely adjusted.

  A micrometer 22 is attached to the lower part of the position adjusting member 20, and the contact rod 22b is advanced and retracted in the direction of the arrow e in units of 1/100 mm by rotating the scaled rotary ring 22a in the direction of the arrow d. It is configured. As shown in FIG. 1, a support post 23 is erected on the upper surface of the cutter mounting portion 6 a, one end of the coil spring 24 is connected to the support post 23 via a turnbuckle 25, and the other end of the coil spring 24 is connected to the rotating column 2. It is connected. Thereby, the spring force i of the coil spring 24 is urged toward the rotating column 2 with respect to the cutter mounting portion 6a. Therefore, the tip end surface of the contact rod 22 b of the micrometer 22 is always pressed against the outer peripheral surface (copied surface) 3 b of the labyrinth ring 3 by the spring force of the coil spring 24.

  As shown in FIG. 2, the turnbuckle 25 and the column 23 are connected via a screw 25 a screwed with a screw hole provided in the turnbuckle 25, and the turnbuckle 25 and the coil spring 24 have the same configuration. And is connected via a screw 25a. Therefore, when the turnbuckle 25 is turned, the relative position between the turnbuckle 25 and the screw 25a is changed, whereby the spring force of the coil spring 24 applied to the contact rod 22b of the micrometer 22 can be changed. ing.

In this embodiment, the work procedure in the case of cutting the short fins 4c of the labyrinth seal 4 of the labyrinth ring 3 will be described below mainly based on FIGS.
First, the labyrinth ring 3 is fixed to the fixing surface 1 a of the horizontal fixing plate 1 by the fixing jig 5. In this case, the labyrinth ring 3 may be positioned so as to roughly match the movement locus of the cutter attachment portion 6a attached to the tip of the arm 6, that is, the movement locus making an arc motion, and the cutting treatment attached to the cutter attachment portion 6a. It is not necessary to precisely match the movement trajectory of the tool 10.

  Next, as shown in FIG. 5, the cutter attaching portion 6 a is attached to the arm 6 so that the position of the arm 6 in the longitudinal axis direction (the radial direction of the workpiece 3, the arrow j direction) can be adjusted. The tip surface of the contact rod 22b of the micrometer 22 can be pressed against the outer peripheral surface (copying surface) 3b of the labyrinth ring 3 by the spring force of the coil spring 24. Then, the spring force of the coil spring 24 applied to the contact bar 22b is adjusted by adjusting the positional relationship between the turnbuckle 25 and the screw 25a screwed with the turnbuckle 25. Next, the position adjusting screw 21 is rotated to set the cutting tip 14 and the tip of the short fin 4c of the labyrinth seal 4 to the reference position a before cutting in FIG.

  Next, the arm 6 is rotated in the horizontal direction (direction f or g in FIGS. 5 and 6), and the cutting jig 10 and the micrometer 22 are once moved outside the fixed position of the labyrinth ring 3. At that position, the contact rod 22b of the micrometer 22 is advanced by the cutting amount. As a result, the cutting tip 14 moves forward to the position b in FIG. 2, and an accurate cutting amount c (ab) is set. The spring force applied to the contact bar 22b by the coil spring 24 acts in the direction of arrow i in FIG.

  Next, compressed air is supplied from the hose 8 to rotate the air motor 11a, and the tip mounting portion 13 is rotated in the direction of arrow h. Then, the tip of the arm 6 is rotated in the circumferential direction (f or g direction) of the labyrinth ring 3 so that the contact bar 22b of the micrometer 22 is brought into contact with the copying surface 3b, and the contact bar 22b is moved along the copying surface 3b. And the short fins 4c are cut with the cutting tip 14.

  According to this embodiment, when the labyrinth ring 3 that is a workpiece is first fixed on the stationary platen 1, accurate positioning work is not required. That is, since the elastic force i of the coil spring 24 acts on the rotary column 2 side with respect to the cutter mounting portion 6a, the tip surface of the contact rod 22b of the micrometer 22 is always pressed against the copying surface 3b of the labyrinth ring 3. It has become. Therefore, accurate copying can be performed without accurately positioning the fixed position of the labyrinth ring 3.

  Further, the cutting tip 14 of the cutting jig 10 is aligned with the tip position of the short fin 4c of the labyrinth seal 4 to be cut by the position adjusting screw 21, and this is used as a reference position. Since the cutting amount c (ab) is set by moving forward, it is possible to cut only a desired cutting amount by one cutting operation. In addition, since the micrometer 22 can advance and retract the contact rod 22b in units of 1/100 mm, the cutting amount can be set accurately, and therefore cutting with high accuracy can be performed.

The cutting jig 10 includes a chip mounting portion 13 having a chip mounting base 13a protruding radially in the horizontal direction, and has a structure in which cutting tips 14 are mounted on the chip mounting base 13a, respectively. Since the distance x between the outer peripheral end of the tip 14 and the outer diameter of the spindle 12 is longer than the distance y between the long fin 4b and the short fin 4c, the cutting tip 14 is placed in the short fin 4c in the narrow space n. Therefore, the short fin 4c can be cut.
Moreover, since the set cutting amount c can be accurately cut, only one cutting process is required. Therefore, it is not necessary to repeat the gap confirmation and adjustment work many times as in the case of using a grinder or a grindstone.

  Moreover, since the cutting tip 14 can use a commercial item, it is inexpensive, and when one cutting blade 14a of the four sides is worn, another cutting side 14a is reattached so as to come to the cutting position. All cutting blades 14a can be used. Therefore, the life of the cutting tip 14 can be extended and the maintenance cost can be reduced.

  Furthermore, in this embodiment, since compressed air is used as a drive source for the cutting jig 10, it can be easily used in a factory or the like, and the performance of the cutter can be varied depending on the number of cycles of the commercial power supply as in the case of using an electric motor. Is not affected. Further, since the air motor 11a is used, even if galling occurs and the load fluctuates, the load fluctuation can be absorbed by the elastic force of the air, so that the cutting operation can be maintained without stopping, so that smooth A smooth cutting surface can be formed.

  In the present embodiment, the short fins 4c of the labyrinth seal 4 are cut. However, as a matter of course, the cutting jig of the present invention is used even when the long fins 4b of the labyrinth seal 4 are cut. be able to.

  According to the cutting jig of the present invention, like a fin of a labyrinth ring, it is possible to cut a concave portion of a workpiece in which a concave and convex portion is formed in a narrow space.

It is a perspective view showing the whole composition of one embodiment of the present invention. It is a front view which shows the cutter attachment part of the said embodiment. It is a top view of the chip attachment part of the embodiment. It is a front view of the chip | tip attachment part of the said embodiment. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the rotor shaft end of the conventional gas turbine. (A) is sectional drawing which shows the labyrinth seal part of the conventional turbine rotor axis | shaft, (b) is the enlarged view. It is a vertical elevation view which shows the conventional cutting jig.

Explanation of symbols

1 Fixed platen 2 Rotating column 3 Labyrinth ring (workpiece)
3a Outer peripheral surface (copy surface)
4 Labyrinth seal 4a Fin (uneven portion)
6 Arm 10 Cutting jig 12 Spindle (Rotating shaft)
21 Position adjusting screw 22 Micrometer 22b Contact rod (contact)
24 Coil spring (spring force biasing means)
Reference position before cutting b Cutting position c Cutting depth f, g Circumferential direction of workpiece 3 i Spring force j Radial direction of workpiece 3 h Direction of rotation of tip mounting portion 13

Claims (5)

In a cutting jig for cutting a recess by allowing a cutting blade to enter a narrow space where the uneven portion is formed with respect to a workpiece in which a narrow uneven portion is formed along a side surface or a peripheral surface,
The cutting jig includes a chip mounting portion having a plurality of chip mounting bases radially projecting in a radial direction with respect to the rotation direction, a rotation shaft that rotatably supports the chip mounting portion around a central axis, It consists of multiple cutting tips removably attached to the tip mounting base,
The outer peripheral end of the cutting tip attached to the tip mounting base is located outside the outer diameter of the rotating shaft, and the distance between the outer diameter of the rotating shaft and the cutting edge of the cutting tip is the concave and convex portions of the concave and convex portions. Is greater than the distance between
Provided is a moving positioning means for positioning the tip mounting portion into a narrow space where the concave and convex portions are formed and positioning the concave portion through the rotating shaft at a position for cutting the concave portion ;
The movement positioning means includes a position adjusting member that moves the tip attaching portion forward and backward to bring the cutting tip into contact with the recess of the workpiece, and is attached to the position adjusting member. A micrometer that sets the cutting amount by bringing the cutting tip into contact with the recess and setting the reference position as a reference position, and further moving the cutting tip forward through the contact by the amount of cutting. Cutting jig to do.   The moving positioning means includes spring force biasing means for applying a spring force in a direction in which the cutting tip is pressed against the cutting surface of the recess, and supports the rotating shaft via the spring force biasing means. The cutting jig according to claim 1, wherein the cutting jig is configured as follows. Said positioning means, said rotary shaft and provided integrally, and said contactor in contact with the scanning surface provided in a circular arc shape of the workpiece, the spring force in a direction of pressing the contacts into surface have該倣The cutting jig according to claim 1, further comprising: a spring force urging unit that applies   The cutting jig according to claim 1, wherein the rotating shaft is driven to rotate by an air motor.   The cutting tip has a polygonal shape, each side of the polygon individually constitutes a cutting blade, and any side of the polygon can be attached to a cutting position facing the uneven portion. The cutting jig according to claim 1.

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