JP2011177869A - End mill and machining method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machining method reducing machining man-hour by reducing centering work of a half-annular member and an umbrella-like end mill to half in every replacement of the half-annular member by machining an inclination surface with reverse slope only by movement of the umbrella-like end mill using the umbrella-like end mill when the inclination surface of a joint surface of an annular member formed in a ring-like shape by opposing the half-annular members of the same shape is machined. <P>SOLUTION: A first joint surface 11 having a first C inclination surface 113 extending along an annular axis direction is provided on one end of a half-annular turbine stationary blade 1 of the same shape, and a second joint surface 12 formed in a shape corresponding to the first joint surface 11 shape and having a second C inclination surface 123 is provided on the other end. The umbrella-like end mill 4 attached with a roughing tip 5 on an inclination part 41 having the same inclination as the respective inclination surfaces 11, 12 is moved along a surface plate 2. Thereby, the first C inclination surface 113 and the second inclination surface 123 can be cutting-machined. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an end mill for processing a mating surface to be joined in an annular manner by facing semi-annular members and a method of processing using the end mill.

In the case of manufacturing a turbine vane having a large diameter, a structure in which halved parts having the same shape are manufactured and joined in an annular shape facing each other is produced.
Accordingly, the joining surface for joining the half-shaped turbine stationary blades is often shaped so that the unevenness of the three-dimensional joining surface follows the three-dimensional joining surface in order to prevent the joining surface from being displaced during assembly.

One end of the semi-annular member is a first A surface formed along a plane including an axis when the semi-annular members are combined into an annular shape, and a first extending continuously along the axial direction to the A surface. A first joint surface having an inclined surface and a first B surface arranged in parallel with the first A surface in succession to the first inclined surface is formed.
On the other hand, a surface that abuts on the other end so as to follow the first joint surface is formed.
That is, the second joining surface at the other end includes a second A surface that comes into contact with the first A surface, a second inclined surface that follows the first inclined surface, and a second B surface that comes into contact with the first B surface. And have.
The first A surface and the second A surface, and the first B surface and the second B surface are in an uneven relationship.
As a result, two halved parts having the same shape can be made to face each other and joined together in an annular shape.

However, since the first inclined surface and the second inclined surface are different in the direction of the inclination, as shown in FIG. 5, the processing of the joint surface of the semi-annular member 01 is the first A surface at one end as a reference processing surface. The first A surface 011 and the first B surface 012, and the first A surface 011 and the first B surface 012 are formed in a bowl shape including horizontal portions 014 (two-dot chain line portions) that are horizontally continuous. In the next step, the second part A, the second part B, and the horizontal part connecting the second part A and the second part B are formed. (Not shown)
Thereafter, the horizontal portion 014 is cut by the end mill 02 to process the first inclined surface 013 into a step shape.
However, when the cutting of the first inclined surface 013 is completed by the end mill, it is necessary to reverse the semi-annular member on the surface plate, and after reversing the semi-annular member, the end mill and the semi-annular member are aligned and fixed. There is a need.
This inversion work is because it is difficult to ensure the machining accuracy because the second inclined surface formed on the horizontal portion (downward surface) connecting the second A surface and the second B surface is a cutting operation in a downward inclined state. is there.
In particular, in the case of a large stationary blade turbine used for power generation or the like, it must be set by two persons using a crane or the like, which requires a large number of man-hours for the work and increases the cost. It was a factor.

Japanese Patent Application Laid-Open No. 2004-34170 is known as Patent Document 1 for cutting an inclined surface. As shown in FIG. 6, according to Patent Document 1, the sheet material 020 is sandwiched between the peripheral surface 070a of the guide roller 070 and the blade portion 010a of the end mill 010, and the axis of the end mill 010 is set at a predetermined angle with respect to the rotation axis L of the guide roller 070. A technique is disclosed in which an inclined surface machining is performed by inclining α and rotating the guide roller 070 and the end mill 010 at a predetermined speed.
Even in this case, when the inclination angle α of the end mill 010 is changed with respect to the rotation axis L of the guide roller 070, the relative position between the end mill 010 and the sheet material 020 is changed along with the adjustment of the inclination angle α. Since the relationship is shifted and the cutting range of the sheet material 020 is shifted, it is necessary to correct the axial position of the end mill 010, and a large number of man-hours are required for the adjustment work.

An end mill structure is disclosed in Japanese Patent Laid-Open No. 7-195221 as Patent Document 2. As shown in FIG. 7, a roughing ball end mill is disclosed in which a plurality of wave-shaped cutting edges 081 or cutting edges having a nick are provided on the outer peripheral portion of a tool body 080, and a ball-shaped ball edge 082 is provided at the tip. ing.
In this case, if the cutting edge is worn, it is necessary to replace the entire tool 080, which is wasteful of expensive high-speed blade steel (common name; high speed), which is disadvantageous in terms of cost.

JP 2004-34170 A JP-A-7-195221

  In view of the problems of the prior art, the present invention uses an umbrella-shaped end mill to process the inclined surface of the joint surface of the annular member formed in an annular shape by facing the semi-annular members having the same shape to each other. By making it possible to machine the reverse inclined surface only by moving the umbrella-shaped end mill, the centering work between the semi-annular member and the umbrella-shaped end mill that is performed each time the semi-annular member is reversed is reduced, thereby reducing the number of processing steps. An object of the present invention is to provide an end mill for processing a joint surface of a semi-annular member and a processing method using the end mill for improving the processing accuracy of the joint surface.

The present invention achieves such an object, and the semi-annular member having a mating surface shape in which the semi-annular members having the same shape are opposed to each other and joined in an annular shape is a first extending in the annular axial direction at one end. A second joint having a first joint surface having an inclined surface and a second inclined surface formed at the other end in a shape that follows the shape of the first joint surface and having a shape facing the first inclined surface. In the method for processing the joint surface of the semi-annular member of the first inclined surface and the second inclined surface,
The semi-annular member is fixed on a surface plate, and the core of the semi-annular member and an umbrella-shaped end mill having a plurality of luffing tips mounted on an inclined portion having the same inclination as the first and second inclined surfaces After performing the combination, a first step of forming the first inclined surface in the umbrella-shaped end mill,
A second step of moving the umbrella-shaped end mill to the other end along the surface plate and forming the second inclined surface of the second joint surface by the umbrella-shaped end mill; Processing method for mating surfaces.

  In such an invention, the shape of both ends of the semi-annular member is symmetrical in the axial direction of the annular member, and the inclined surface cutting of both ends of the semi-annular member is moved to the inclined surface by moving the umbrella-shaped end mill along the surface plate. Since the cutting surface of the semi-annular member can be cut only by changing the cutting pressure direction, the semi-annular member is reset on the surface plate (reversed), and the semi-annular member and the end mill are aligned. The troublesome work such as this can be reduced, and the cost required for processing can be greatly reduced.

  In the present invention, preferably, the luffing tip attached to the tip of the umbrella-shaped end mill is provided with a roughing R-shaped blade at the tip of the blade tip.

  By adopting such a configuration, it is possible to simultaneously perform the R processing of the corner portion between the surface connected to the inclined surface and the inclined surface and the cutting processing of the inclined surface, thereby reducing the number of processing steps and reducing the cost. .

Preferably, in the invention of the present application, the umbrella-shaped end mill has a plurality of luffing-shaped chips mounted on an inclined portion of the umbrella-shaped end mill at a front-rear luffing chip at a front-rear position in a rotational direction on the umbrella-shaped circumference. It is preferable that the wave shape position of the rear side and the wave shape position of the luffing tip on the rear side are mounted while being shifted along the inclination of the inclined portion.

By adopting such a configuration, the luffing tip is mounted with the remaining portion of the circumferential luffing cut attached in the rotational direction rearward in the umbrella-like circumferential direction and shifted along the inclination of the inclined portion. However, since the workpiece is cut, the surface roughness of the inclined portion can be adjusted by the amount of displacement, and if the amount of displacement is reduced, the surface becomes fine and the finishing process can be omitted depending on the degree of roughness required by the specification.
Furthermore, when a fine finish surface is required, the work time by the high speed of the finishing process is shortened, the amount of wear of the high speed is also reduced, the replacement time of the high speed can be extended, and the cost can be reduced by reducing the number of man-hours.

  In the present invention, the third step of finishing the first inclined surface with an umbrella-shaped finishing high speed blade having a cutting edge on the inclined portion having the same inclination as the first and second inclined surfaces; It is preferable to move the umbrella-shaped finishing high speed along the surface plate to the other end side and finish the second inclined surface.

  With such a configuration, finishing is performed when the processed surface does not satisfy the required roughness in the finished state of the first and second steps, but the umbrella-shaped end mill is also defined in the finishing step. By moving along the plate, it is possible to cut the inclined surface at both ends of the semi-annular member only by changing the cutting pressure direction to the inclined surface, so set the semi-annular member on the surface plate again. The troublesome work such as centering of the semi-annular member and the end mill can be halved, and the cost required for processing can be greatly reduced.

According to the present invention, by moving the umbrella-shaped end mill along the surface plate, the inclined surface cutting in which the shapes of both ends of the semi-annular member are symmetrical in the axial direction of the annular member is performed. By changing only the direction of the pressing force on the surface, it is possible to perform inclined surface cutting at both ends, and the cost required for processing can be greatly reduced.
Also, the luffing tip attached to the tip of the umbrella-shaped end mill is provided with a roughing R-shaped blade at the tip of the blade tip. Since the R processing of the bent portion with the surface can be performed, the number of processing steps is reduced, and the cost can be reduced.

These show the schematic of the cutting condition concerning embodiment of this invention. Is a process diagram showing the machining shape and sequence of machining processes, (A) rough machining of the machining reference surface, (B) reference flat surface finishing machining and inclined surface rough machining, (C) inclined surface finishing machining. And (D) shows the R section finishing process drawing. The end mill perspective view of the umbrella-like luffing tip mounting concerning the embodiment of the present invention is shown. 1A is a perspective view of a luffing tip, and FIG. 2B is an enlarged plan view of a luffing R portion according to an embodiment of the present invention. The cutting process figure of the inclined surface in a prior art is shown. The other cutting form figure in a prior art is shown. (Patent Document 1) The external view of the other roughing end mill in a prior art is shown. (Patent Document 2)

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 components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

FIG. 1 shows a state where a semi-annular turbine stationary blade 1 which is a semi-annular member is fixed on a surface plate 2 via a setting block 3 by a fixing clamp (not shown). The end mill 4 is a tool for cutting the inclined surface of the semi-annular turbine stationary blade 1.
A head portion 8 that fixes and rotates the end mill 4 is held so as to be movable (slidable) along a surface plate 2 on a sliding bed of a machine tool (not shown). The relative positional relationship between the sliding bed of the machine tool and the surface plate 2 is maintained precisely.
The head unit 8 has a device that can adjust the movement in the direction perpendicular to the moving direction of the sliding bed (distance from the surface plate 2) and the vertical direction with high accuracy.
In the drawing, in order to clarify the explanation of each part of the semi-annular turbine stationary blade 1, the shape of the joining portion is the shape in the cutting finished state.

As shown in FIG. 1, the semi-annular turbine vane 1 is formed in a semi-annular shape, and a first seaming surface 11 at one end and a second seaming surface 12 at the other end are in the direction of arrow A, Are formed symmetrically in the vertical direction.
The semi-annular turbine stationary blade 1 has an outer ring 101 as an outer periphery, an inner ring 102 that externally fits a rotor (not shown) that is an output shaft of the turbine, and a steam flow between the outer ring 101 and the inner ring 102 on the rotor blades of the turbine. The nozzle plate 103 (blade) is guided so as to guide it efficiently.

A first seaming surface 11 at one end of the semi-annular turbine vane 1 includes a first A surface 111 formed on the outer ring 101 along a surface including an axis (axis when formed annularly), the first A surface. A first C inclined surface 113 that is an inclined surface extending in the axial direction continuously to 111, and a first B surface arranged in parallel to the first A surface 111 continuously to the first C inclined surface 113 112 and the first A ′ surface 114 and the first C ′ inclined surface formed on the inner ring 102 and located in the same plane as the first A surface 111, the first C inclined surface 113, and the first B surface 112, respectively. 116 and the first B ′ surface 115.
In addition, in order to prevent the following description from being complicated, the first A surface 111 and the first A ′ surface 114 are collectively referred to as the first A surface 111, and the first B surface 112 and the first B ′ surface 115 are combined. The first B surface 112 is collectively referred to, and the first C inclined surface 113 and the first C ′ inclined surface 116 are collectively referred to as a first C inclined surface 113.

On the other hand, the second joining surface 12 is formed on the outer ring 101 at the other end so as to follow the shape of the first joining surface 11, and the second A surface 121 having a shape facing the first A surface 111, the first A second C inclined surface 123 having a shape facing the C inclined surface 113, a second B surface 122 having a shape facing the first B surface 112, and the inner ring 102, the first A surface 121, the first C The first A ′ surface 124, the first C ′ inclined surface 126, and the second B ′ surface 125 are located in the same plane as the inclined surface 123 and the first B surface 122.
In addition, in order to prevent the following description from being complicated, the second A surface 121 and the second A ′ surface 124 are collectively referred to as a second A surface 121, and the second B surface 122 and the second B ′ surface 125 are combined. The second B surface 122 is collectively referred to, and the second C inclined surface 123 and the second C ′ inclined surface 126 are collectively referred to as a second C inclined surface 123.
Therefore, the semi-annular turbine stationary blade 1 is formed in an annular shape by causing two identically shaped objects to face each other and bringing the first seaming surface 11 and the second seaming surface 12 into contact with each other and fixing them together. .
By forming the semicircular ring in this way, the size of the manufacturing facility can be halved, the capital investment can be halved, the handling is facilitated, and the cost can be reduced.

The cutting method of the first joint surface 11 and the second joint surface 12 is as follows:
The semi-annular turbine stationary blade 1 is placed on the surface plate 2 via the setting block 3 and fixed by a fixing clamp (not shown). Next, the first and second joint surfaces 11 and 12 of the semi-annular turbine vane 1 are aligned with the cutting tool (not shown) having a cutting edge in the front-rear, left-right, and vertical directions to perform cutting. A first step of setting a processing reference position.
As a 2nd process, after cutting the 1st A surface 111 of the 1st splicing surface 11 with a cutting tool, the 1st B surface 112 is cut, and a gap between 1st A surface 111 and 1st B surface 112 is made. Process to form a reference surface for cutting. (Shape of Fig. 2-A. Cutting the shaded area)
As a third step, the cutting tool is moved along the surface plate 2 to the second joining surface 12 side, which is the other end, and after cutting the second A surface 121 on the second joining surface side 12, the second B surface The process of cutting 122, cutting between the 2nd A surface 121 and the 2nd B surface 122 in a bowl shape, and forming the reference surface of cutting.
Note that there is no special reason for the cutting order of the second A surface 121 and the second B surface 122 whichever comes first. (The shape of Fig. 2-A. The part corresponding to the shaded area is cut.)

As a fourth step, the first A surface 111 and the first B surface of the first joining surface 11 are obtained in an end mill 02 (see FIG. 5, this process is the same as the conventional one) on which a plurality of luffing tips 5 are mounted. The first C inclined surface 113 is formed by roughing a portion cut into a bowl shape between 112. (Cutting into the shape of Fig. 2-B)
As a fifth step, the end mill 02 is moved along the surface plate 2 toward the second joining surface 12, and the cutting pressure direction in which the end mill 02 is pressed against the first C inclined surface 113 is opposite to the axis of the end mill 02. The second C inclined surface 123 is formed by roughing the portion of the second joint surface 12 that has been cut into a bowl shape between the second A surface 121 and the second B surface 122. . (Cutting into the shape of Fig. 2-B)

As the sixth step, the first A surface 111 and the first B surface 112 of the first joint surface 11 are finished with a throw-away milling tool.
As a seventh step, the milling tool is moved along the surface plate 2 to the second joining surface 12 side, and finishing of the second A surface 121 and the second B surface 122 is similarly performed.

As an eighth step, the plurality of luffing chips 5 have the same inclination as the first C and second C inclined surfaces 113 and 123, and the same length as the inclination, or a slightly longer length (length from the A surface to the B surface direction). The tip of the so-called general-shaped umbrella-shaped end mill 4 mounted on the inclined portion 41 (FIG. 3) having the) is aligned with the bent portion of the first A surface 111 and the first C inclined portion. The first C inclined surface 113 is formed by the umbrella-shaped end mill 4. (So-called first step)
As a ninth step, the umbrella-shaped end mill 4 is moved to the second joining surface 12 side along the surface plate 2, and the cutting pressure direction of the umbrella-shaped end mill 4 is set to the first C inclined surface 113 with respect to the axis of the umbrella-shaped end mill. The second C inclined surface 123 between the second A surface 121 and the second B surface 122 of the second joining surface 12 is formed by pressing to the opposite side to the direction pressed. (So-called second step)

In the present embodiment, the head portion 8 holding the umbrella-shaped end mill 4 can move on the sliding bed of the machine tool along the surface plate 2 while maintaining the relative positional relationship with the surface plate 2 with high accuracy. Since the cutting pressure direction of the umbrella-shaped end mill 4 having the same inclination as the inclinations of the first and second C inclined surfaces 113 and 123 is changed, the conventional semi-annular turbine stator blade 1 is inverted. Compared to the construction method, it becomes easy to increase the processing accuracy.
Further, since the work of inverting the semi-annular turbine stationary blade 1 can be omitted, the centering work of the semi-annular turbine stationary blade 1 and the umbrella-shaped end mill 4 can be halved, and the cost can be reduced along with the reduction in the number of processing steps.

In the present embodiment, as shown in FIG. 4, a plurality of luffing tips 5 attached to the umbrella-shaped end mill 4 are provided with a roughing R portion 51 having an R-shaped blade portion at a corner portion, and at least a portion B in FIG. 3. Arranged.
As a result, the first chamfering of the concave bent portion between the first A surface 111 and the first C inclined surface 113 can be performed simultaneously with the cutting of the first C inclined surface 113.
In addition, the R-shaped blade portion of the corner portion is less likely to generate stress in the corner portion by reducing the luffing pitch than other flat portions and reducing the chamfered first R surface roughness of the concave bent portion. Has the effect of reducing.

Furthermore, the arrangement of the plurality of luffing tips 5 arranged on the inclined surface 41 of the umbrella-shaped end mill 4 is as follows.
On the circumference of the inclined surface 41, the wave shape position of the rear luffing tip 5 is along the inclined surface 41 with respect to the wave shape position of the front luffing tip 5 at the front and rear positions in the rotational direction of the umbrella-shaped end mill 4. It is installed with a shift.
When the shift amount is set to 1/4 pitch (roughing), the cutting roughness becomes 1/4 of the luffing pitch, and when it is set to 1/2 pitch, the cutting is performed to a roughness twice the 1/4 pitch.
Therefore, the cutting surface roughness of the first C inclined surface (including the second C inclined surface) to be ground can be made fine by reducing the amount of shifting, and the finishing process may be omitted depending on the required specifications. is there.
Moreover, when the cutting surface roughness does not satisfy the required specifications in the previous step, the following steps are further added.

As a tenth step, instead of the umbrella-shaped end mill 4 equipped with a plurality of luffing tips 5, the same inclination as the first C and second C inclined surfaces 113 and 123 and the same as the inclination or a slightly longer length ( The first C inclined surface 113 on the first joining surface 11 side by the umbrella-shaped finishing high speed 6 having a cutting blade 61 on the inclined surface of the inclined portion having a length from the A surface to the B surface direction). So-called third process of finishing. (Shape of Fig. 2-C)
As an eleventh step, the umbrella-shaped finishing high speed 6 is moved along the surface plate 2 to the second joining surface 12 side, and the second C inclined surface 123 on the second joining surface 12 side is finished so-called fourth. Process. (Shape of Fig. 2-C)

As a twelfth step, in place of the umbrella-shaped finishing high speed 6, an R-shaped high speed 7 having a concave cutting edge (see FIG. 2D), the first C inclined surface 113 on the first joining surface 11 side, A finishing step of chamfering the second R of the convex bent portion with the first B surface. (Shape of Fig. 2-D)
As a thirteenth step, the R-shaped high speed 7 is moved along the surface plate 2 to the second joining surface 12 side, and the second C inclined surface 123 and the second B surface 122 on the second joining surface 12 side are A finishing step of chamfering the second R of the convex bent portion. (Shape of Fig. 2-D)

The cutting process of the mating surfaces of the first seaming surface 11 and the second seaming surface 12 of the semi-annular turbine stationary blade 1 is completed through the above steps.
In the present embodiment, the start of the machining process is described to be performed from the first joining surface 11 side, but when the process ends at the second joining surface 12 side and the process proceeds to the cutting process of the next shape, The cutting process of the next shape is started on the second joining surface 12 side, and after the cutting process is finished, the tool is moved to the first joining surface 11 side, and the cutting process of the same shape is performed on the first joining surface 11 side. Of course, it is also possible to implement.

According to the present embodiment, the first and the second ends of the semi-annular turbine stationary blades 1 are configured so that the shapes having the inclined portions at both ends of the semi-annular turbine stationary blade 1 are symmetrical in the axial direction of the semi-annular turbine stationary blade 1. By moving the umbrella-shaped end mill 4 along the surface plate to cut the second inclined surfaces 113 and 123, only the cutting pressure direction on the first and second inclined surfaces 113 and 123 is changed, so that the semi-annular shape is changed. Since the first and second inclined surfaces 113 and 123 at both ends of the turbine vane 1 can be cut, the semi-annular turbine vane 1 is reversed on the surface plate 2, and the semi-annular turbine vane 1 and the end mill The troublesome work such as centering can be cut in half, and the cost can be reduced by reducing the number of processing steps.
Further, since the luffing R-shaped blade portion is formed at the tip portion of the cutting edge of the luffing tip 5 attached to the tip portion of the umbrella-shaped end mill 5, the first A surface 111, the first inclined surface 113, and the second A surface Since the first R processing of the bent portion between the second inclined surface 123 and the second inclined surface 123 can be performed simultaneously with the inclined surface processing, the number of processing steps can be reduced and the cost can be reduced.
The luffing tip 5 in which the luffing R-shaped blade portion is formed at the tip of the cutting edge of the luffing tip 5 is not used only at the tip of the umbrella-shaped end mill 4, and is attached to the other portion of the inclined portion 41. The cost reduction effect can be achieved by using the luffing chip 5 in common and suppressing the increase in the number of parts management points.

  An inclined surface in which the joining surface of the semi-annular member having a mating surface shape that faces the semi-annular members of the same shape and joins in an annular shape is formed symmetrically with respect to the annular axial direction is formed on the inclined surface. The present invention can be applied to turbine stationary blades that require umbrella-shaped end mill processing along an inclination.

DESCRIPTION OF SYMBOLS 1 Semi-annular turbine stationary blade 2 Surface plate 3 Block for set 4 Umbrella-shaped end mill 5 Roughing tip 6 Finishing high speed 7 R-shaped high speed 11 First joint surface 12 Second joint surface 41 Inclined portion 51 Roughing R portion 61 Cutting blade 101 Outer ring 102 Inner ring 103 Nozzle plate 111 First A surface 112 First B surface 113 First C surface 121 Second A surface 122 Second B surface 123 Second C surface

Claims (4)

  The semi-annular member having a mating surface shape for facing the semi-annular members of the same shape and joining them in an annular shape includes a first seaming surface having a first inclined surface extending in the annular axial direction at one end. A second seam surface having a second sloped surface having a shape opposite to the first sloped surface and having a shape facing the first sloped surface at the other end, and the first sloped surface, In the joint surface processing method of the semi-annular member of the second inclined surface, the semi-annular member is fixed on a surface plate (fixed surface), and the same as the semi-annular member and the first and second inclined surfaces. A first step of forming the first inclined surface with the umbrella-shaped end mill after centering with an umbrella-shaped end mill having a plurality of luffing tips attached to an inclined portion having an inclination; and the umbrella-shaped end mill; Is moved to the other end along the surface plate, and the umbrella-shaped end Processing method of seaming surface of the semi-annular member and a second step of forming the second inclined surface of said second seaming surface at.   2. The processing of the joining surface of the semi-annular member according to claim 1, wherein the roughing tip attached to the tip of the umbrella-shaped end mill has a roughing R-shaped blade at the tip of the blade tip. Method.   In the umbrella-shaped end mill, the plurality of luffing-shaped tips attached to the inclined portion of the umbrella-shaped end mill are front and rear positions in the rotational direction on the umbrella-shaped circumference, the wave-shaped position of the luffing tip on the front side, and the rear side 3. The method for processing a joining surface of a semi-annular member according to claim 1, wherein the luffing tip is mounted with a wave shape position shifted along the inclination of the inclined portion.   In the present invention, the third step of finishing the first inclined surface with an umbrella-shaped finishing high speed blade having a cutting edge for an inclined portion having the same inclination as the first and second inclined surfaces, and the umbrella The shape finishing high speed is moved to the other end side along the surface plate, and the cutting pressure direction in which the umbrella shaped finishing high speed is pressed against the first inclined surface is pressed opposite to the axis of the umbrella shaped finishing high speed. The method for processing a joining surface of a semi-annular member according to claim 1 or 3, further comprising a fourth step of finishing the second inclined surface.

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