JP2010234511A - Finishing tool for sealing surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finishing tool for a sealing surface, which is simplified in structure and reliably smoothes cutting marks spirally formed on the sealing surface when subjected to cutting work with a rotary type cutting tool. <P>SOLUTION: The finishing tool 1 for the sealing surface includes: a body 10; an annular flat working surface 11 formed on the leading end of the body to be in contact with the sealing surface; a shoulder 12 formed on the body in an area outside the cutting surface 11 so as to surround the same and inclining toward the base end of the body at an angle of 20 to 30 degrees with respect to the working surface on a longitudinally sectional plane of the body; a relief portion 13 formed in an area surrounded by the working surface 11 in a concave shape; and a pressing member for pressing the base of the body toward the leading end thereof. An angle between the extension of a tangent, appearing when drawing the tangent in a concave shape at the inner edge of the working surface along a longitudinal section of the body, and the working surface ranges from 20 to 30 degrees. The working surface 11 is brought into contact with the sealing surface, resulting from cutting work with the rotary type cutting tool, with an appropriate pressing force, upon which the body is moved in parallel to the working surface for thereby finishing the sealing surface. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing surface finishing tool for finishing a sealing surface cut using a rotary cutting tool.

  2. Description of the Related Art Conventionally, parts manufactured by machining a metal such as aluminum have been used in liquid crystal, vacuum chambers for manufacturing semiconductor parts, and the like. Then, in a part where parts such as a vacuum chamber are in contact with each other, a groove 20 having a rectangular cross section as shown in FIG. In addition, a seal member 4 such as an O-ring is interposed in the groove 20. Alternatively, as shown in FIG. 5 (b), a groove 20 is provided on the periphery of the recess 23 of the component 2 so as to be stepped higher than the recess 23, and the seal member 4 is interposed in the groove 20.

  As shown in FIG. 6A, the groove 20 provided in the part for interposing the seal member 4 is usually cut by a rotary cutting tool 22 such as an end mill using a machine tool such as a milling machine. To do.

  By cutting with the rotary cutting tool 22 at the bottom 21 of the groove 20 processed in this way, a spiral cutting mark 21a remains as shown in FIG. 6B. As shown in FIG. 7, the cutting trace 21 a forms a minute gap 21 c including a directional component perpendicular to the machining locus of the rotary cutting tool 22 on the groove bottom surface 21. Therefore, when a sealing member having a shape along the groove 20 is placed on the minute gap 21c, the inside and outside of the space where airtightness should be ensured penetrate. And there exists a problem that the airtightness and vacuum property in a vacuum chamber etc. cannot be maintained.

  In order to solve this problem, Patent Documents 1 and 2 disclose a technique of cutting so as to trace the groove bottom surface 21 using a cutting tool called a hare bite. This finishing process is called a hail process.

  In addition, as shown in FIG. 8, a method of pressing the bottom surface 21 of the groove 20 in which the minute gap 21c is formed by using the finishing tool 1a and crushing the gap 21c to perform a finishing process is also conceivable. However, when a simple bar-shaped tool is used as the finishing tool 1a, for example, the groove bottom surface 21 is cut because the contact area between the groove bottom surface 21 and the tool is large. When the groove bottom surface 21 is cut, the contact area between the groove bottom surface 21 and the seal member is reduced when the seal member is interposed, and a desired sealing property cannot be obtained. The process to remove is needed and processing cost increases. Moreover, the shavings produced | generated at the time of finishing process adhere to the lower surface or the groove bottom face 21 of the tool 1a for finishing process with the heat at the time of finishing process. When shavings adhere to the lower surface of the tool 1a, the attached shavings further dig down the groove bottom surface 21, and the desired finished surface cannot be obtained as in the case where shavings adhere to the groove bottom surface 21.

  On the other hand, when the flat tool 1a is used in order to reduce the contact area of the finishing tool on the bottom surface of the groove, the finishing process is performed along the processing locus during milling using an end mill or the like, as shown in FIG. As described above, the width of the portion where the gap 21c is crushed narrows locally as the finishing tool 1a advances. And the clearance gap 21c remains in a part of part which the sealing member 4 contacts the groove bottom face 21, and desired sealing performance cannot be ensured. In order to solve this problem, it is necessary to rotate the tool 1a so as to uniformly maintain the width of the portion that crushes the gap 21c.

  In the technique disclosed in Patent Document 1 described above, a flat plate-shaped tool having a rectangular shape on the bottom surface of the groove is advanced along the groove while rotating, and then the cutting blade of the finishing tool is moved in the advancing direction. On the other hand, it is advanced while being controlled so as to be in the normal direction, and finish cutting is performed.

  In addition, the technique disclosed in Patent Document 2 has a finishing tool having an annular shape on the bottom surface of the groove, and a cutting blade is provided on the periphery of the annular ring to cut the groove bottom surface with a uniform width for finishing. Is.

JP-A-6-126520 JP 2002-144137 A

  However, the above-described conventional technology has the following problems. Since the technique described in Patent Document 1 is configured to control the rotation of the cutting blade of the finishing tool so that it is in the normal direction with respect to the traveling direction, the tool is appropriately rotated according to the shape of the groove to be processed. It needs to be complicatedly controlled.

  In addition, since the techniques described in Patent Documents 1 and 2 are configured to further cut the groove bottom formed by the rotary cutting tool during cutting, as described above, the groove bottom 21 and the seal member after finishing. Or the generated shavings adhere to the finishing tool or the groove bottom, and the desired sealing performance cannot be obtained. Further, even when the shavings do not adhere to the tool or the groove bottom, there is a problem in that a process for removing the shavings is required and the processing cost increases.

  Further, in a machine tool such as a conventional milling machine, as shown in FIG. 8, in order to perform finishing with the tool chucked on the holder 30, for example, finishing is performed using a flat finishing tool. In this case, the area of the portion where the tool comes into contact with the groove bottom surface is still large, and there is a problem that the tool is seized when crushing the cutting trace and the finished surface is not formed smoothly.

  The present invention has been made in view of such problems, has a simple structure, and reliably smoothes the cutting trace formed in a spiral shape on the seal surface cut by the rotary cutting tool. It is an object to provide a tool for finishing a sealing surface.

  A sealing surface finishing tool according to the present invention is a sealing surface finishing tool for finishing a sealing surface that has been cut using a rotary cutting tool. An annular flat processing surface formed in contact with the sealing surface and formed on the outer side so as to surround the processing surface, and at an angle of 20 to 30 ° with respect to the processing surface in the longitudinal section of the main body. A shoulder portion inclined toward the base end side of the main body, a relief portion formed in a concave shape in a region surrounded by the processing surface, and a pressing member that presses the base portion of the main body toward the front end side. An angle formed between an extension line of the tangent line and the machining surface when the tangent line is drawn in the concave shape at the inner edge of the machining surface in a longitudinal section of the main body, and the machining surface is On the cutting surface by the rotary cutting tool The sealing surface is finished by contacting with a pressing force and moving the main body parallel to the processing surface.

  The width of the annular processed surface is preferably 0.2 to 0.25 mm.

  Further, the pressing member is, for example, an elastic member that urges the base end portion of the main body toward the distal end side.

  In this case, the elastic member can be constituted by a compression spring.

  And the said relief part is a hole opened in the front-end | tip part of the said main body, for example, You may supply lubricating oil to the said processed surface through this hole.

  The tool for finishing a sealing surface of the present invention includes an annular flat processing surface, a shoulder inclined toward the base end side of the main body so as to surround the processing surface, and a region surrounded by the inner peripheral edge of the processing surface. It is composed only of a relief portion formed in a concave shape and a pressing member, and the structure is simple.

  In addition, since the machining surface is provided in an annular shape, even when installed on a machine tool that does not have a mechanism for rotating the finishing tool along the direction of travel, the machining surface can be used as a workpiece with a uniform width. It can be touched and finished.

  The annular machining surface is configured to come into contact with the cutting surface with a pressing force by a pressing member, and a concave relief portion is provided in a region surrounded by the machining surface, outside the machining surface. Is provided with a shoulder portion inclined at a predetermined angle with respect to the processing surface. The relief portion is provided such that, when a tangent is drawn to the concave portion at the inner edge of the processed surface in the longitudinal section of the main body, an extension line of the tangent and the processed surface form a predetermined angle. Accordingly, the contact area between the finishing tool and the groove bottom surface can be reduced within a range in which tool seizure does not occur, and the helical cutting trace can be reliably crushed and smoothed with a uniform pressing force. it can.

(A) is the perspective view which looked at the finishing tool of embodiment of this invention from the processing surface side, (b) is a partial cross section figure which shows the finishing tool of this embodiment. It is a longitudinal cross-sectional view which shows the main body and holder of the tool for finishing processing which concern on embodiment of this invention. (A) is a top view which shows the finishing process by the finishing tool which concerns on this embodiment, (b) is the partial sectional view which looked at (a) from the advancing direction of the finishing tool. It is a partial cross section figure which shows the modification of the tool for finishing machining of this invention. (A) is a perspective view which shows the components and seal member which are used for a vacuum chamber etc., (b) is a perspective view which shows the other components and seal member which are used for a vacuum chamber etc. (A) is a perspective view which shows the milling process by an end mill, (b) is a top view of (a). It is a partial cross section figure which shows the groove bottom face in the AA cross section of FIG.6 (b). It is sectional drawing which shows the finishing process with the conventional tool for finishing. It is a top view which shows the finishing process with the conventional tool for finishing.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1A is a perspective view of a main body of a finishing tool according to an embodiment of the present invention as viewed from the processing surface side (upside down), and FIG. 1B is an outside view of the finishing tool according to the embodiment of the present invention. FIG. 2 is a sectional view showing the main body and holder of the finishing tool of the present embodiment, and FIG. 3A is a finishing process using the finishing tool for the seal surface according to the present embodiment. (B) is a partial cross-sectional view of (a) seen from the direction of travel of the finishing tool.

  As shown in FIG. 1 (a), the main body 10 of the sealing surface finishing tool 1 of the present embodiment has a generally cylindrical shape, and an annular flat processing surface 11 is formed at the tip thereof. Yes. A shoulder 12 is formed at the front end of the main body 10 so as to surround an annular processing surface 11 and outward in the radial direction of the main body 10. The shoulder 12 is a flat processing surface 11 of the main body 10. To the base end side of the main body 10. The inclination angle α of the shoulder 12 is 20 to 30 ° with respect to the flat processed surface 11 in the longitudinal sectional view shown in FIG. Further, in the central region of the main body surrounded by the processing surface 11, a concave relief portion 13 is provided, and when a tangent line is drawn on the concave portion at the inner edge of the processing surface 11 in the longitudinal section of the main body 10, The extension line of the tangent line and the processed surface form an angle β of 20 to 30 °. The cylindrical main body 10 has an outer diameter D of, for example, 10 to 30 mm. In the present embodiment, the width W of the processed surface 11 is, for example, 0.2 to 0.25 mm. That is, for example, when the width of the portion to be smoothed by the processed surface 11 is 10 mm, the diameter d1 of the relief portion 13 of the main body 10 is 9.5 to 9.6 mm.

  As shown in FIG. 2, the finishing tool 1 of the present embodiment is attached to a holder 30 such as a main shaft in a machine tool 3 such as a milling machine. In a machine tool such as a milling machine, the tool 1a is detachably attached to the holder 30 as shown in FIG. 8, but in this embodiment, the finishing tool 1 is a holder instead of the tool 1a of the machine tool 3. Attach to 30. That is, the holder 30 is formed such that the mounting hole 31 is coaxial with the holder central axis and opens at the tip (lower end), and the finishing tool 1 enters the hole 31 from the base end side. Inserted. At this time, the compression spring spring 15 is interposed between the wall at the upper end of the hole 31 of the holder 30 and the end surface on the base end side of the main body 10 of the finishing tool 1. Accordingly, the base end portion of the main body 10 is pressed by the spring 15, and the main body 10 is biased toward the front end portion side. Therefore, the main body 10 is pressed against the sealing surface (groove bottom surface 21) of the workpiece 2 having the processed surface 11 at the tip thereof cut by the end mill shown in FIG. Further, a part of the tool 1 is inserted into the holder 30 on the side surface of the main body 10 and a part of the groove 16 is provided, and a screw 30a for preventing the screw 30a is interposed in the groove 16 from the holder 30 side. Thereby, the tool 1 receives the elastic force from the compression spring 15 without coming out of the holder 30 and is pressed against the seal surface (groove bottom surface 21) of the workpiece 2.

  Note that the length of the compression spring spring 15 is, for example, 50 mm. If the length of the spring 15 is shorter than necessary, it is difficult to adjust the pressing force due to an increase in the spring constant. Therefore, the length of the spring 15 can be determined in relation to the protrusion length of the tool 1 from the holder 30. preferable. Further, when the outer diameter D of the main body 10 is, for example, 20 mm, the pressing force by the compression spring 15 is about 125 kgf, but the spring 15 has a force depending on the material of the member 2 to be cut and the roughness of the groove bottom surface 21 after milling. It is preferable to adjust the pressing force. In this case, for example, a screw 30b for adjusting the pressing force of the spring is provided on the wall at the upper end of the hole 31 of the holder 30, and the amount of protrusion of the screw 30b from the wall at the upper end of the hole 31 is adjusted. The pressure can be adjusted. Furthermore, in order to prevent the tool 1 from collapsing during the finishing process, it is preferable that the protrusion length of the tool 1 from the holder 30 is as short as possible within a range in which the holder 30 does not interfere with the workpiece 2 and the like.

  Next, the operation of the sealing surface finishing tool 1 of this embodiment will be described. For example, the O-ring arrangement groove 20 of the vacuum chamber as shown in FIG. 5 is cut by a rotary cutting tool 22 such as an end mill. Then, by cutting with the rotary cutting tool 22 at the bottom 21 of the groove 20, a spiral cutting mark 21a remains as shown in FIGS. 6 (b) and 3 (a).

  Next, the finishing tool 1 of this embodiment is mounted on the holder 30 of the machine tool 3, and the holder 30 is lowered from above the groove 20, thereby lowering the main body 10 of the processing tool 1, and the tip of the main body 10. The (bottom end) flat processed surface 11 is brought into contact with the groove bottom surface 21. When the holder 30 is further lowered, the compression spring spring 15 is retracted, exerts a biasing force on the main body 10, and presses the processed surface 11 of the main body 10 against the groove bottom surface 21. Then, in this state, as shown in FIG. 3A, by moving the holder 30 along the groove 20, the machining surface 11 of the main body 10 crushes the cutting marks 21a on the groove bottom surface 21, and the groove bottom surface. 21 is smoothed.

  The movement of the holder 30 is relative to the member to be cut 2, and the holder 30 may be moved, or the member to be cut 2 may be moved. Further, the finishing tool 1 according to the present embodiment crushes the cutting trace 21a by moving parallel to the machining surface 11 on the groove bottom surface 21, and does not rotate (spin). Therefore, the positional relationship between the main body 10 or the holder 30 and the groove 20 is constant, and the main body 10 slides in one direction along the groove 20. Since the machining surface 11 of the main body 10 has an annular shape, the machining tool 1 according to the present embodiment also has the main body 10 or holder when passing through the bent portion of the groove 20 shown in FIG. The positional relationship between 30 and the groove 20 may be kept constant. That is, the direction of the main body 10 is constant even at the 90 ° bent portion of the groove 20, and as a result, the main body 10 rotates relative to the traveling direction in a direction opposite to the bending direction. . In this way, the main body 10 rotates relative to the traveling direction at the bent portion, and the direction in which the main body 10 is facing is always a constant direction. Therefore, the orientation of the holder 30 that holds the main body 10 Can always be constant. Therefore, the control of the movement of the holder 30 in the machine tool is only movement along the groove 20 of the holder without rotation of the holder (although relatively rotating with respect to the traveling direction) in the bent portion. Easy.

  As described above, the processed surface 11 of the main body 10 slides on the groove bottom surface 21 along the groove 20, whereby the indentation 21a of the groove bottom surface 21 is crushed and the surface is smoothed. As a result, a smooth surface 21 b is formed on the groove bottom surface 21. At this time, since the pressing force of the processed surface 11 against the groove bottom surface 21 is kept constant by the compression spring 15, the smooth surface 21 b is prevented from waviness in the groove traveling direction. Further, the width of the smooth surface 21b is always constant along the traveling direction of the finishing tool 1. At this time, a minute impression may be formed on the smooth surface 21 b by sliding of the finishing tool 1, and the direction of the impression is parallel to the longitudinal direction of the groove 20. That is, the minute indentation has no component extending in the width direction of the groove 20, and even when the seal member is interposed on the smooth surface 21 b, the seal surface (groove 20) is not provided between the groove 20 and the seal member. There is no gap extending in the width direction. Therefore, the sealing performance by the sealing member can be reliably ensured.

  In the finishing tool 1 of the present embodiment, the shoulder 12 formed outside the machining surface 11 is inclined with respect to the machining surface 11 at an angle α of 20 to 30 °. The inclination of the shoulder portion 12 reduces the area where the finishing tool 1 contacts the groove bottom surface 21 and stably applies the force by which the processing surface 11 presses the groove bottom surface 21 from the base end side of the cylindrical main body 10. This contributes to the stable formation of the smooth surface 21b by plastically deforming the member 2 to be cut. If the angle α formed by the shoulder 12 with respect to the machining surface 11 is less than 20 °, the shoulder 12 is formed on the groove bottom 21 when the machining surface 11 crushes the groove bottom 21 to form the smooth surface 21b. The contact area increases, and the groove bottom surface 21 has substantially the same effect as the processed surface 11. Therefore, there is a possibility that the bottom surface 21 is cut to generate shavings, or the tool is seized when the cutting marks 21a are crushed, and the finished surface may not be formed smoothly. On the other hand, when the angle α formed by the shoulder 12 with respect to the processing surface 11 exceeds 30 °, the action of supporting the force pressing the groove bottom surface 21 from the base end side of the cylindrical main body becomes small, and the groove bottom surface 21 The crushing of the cutting marks 21a becomes insufficient, and it becomes difficult to stably form the smooth surface 21b. Therefore, in the present invention, the angle α formed between the shoulder 12 and the processing surface is defined as 20 to 30 °.

  The relief portion 13 of the present embodiment is provided in a region surrounded by the processing surface 11 on the distal end side of the main body, and has a concave shape. And, similarly to the shoulder portion 12, when the concave relief portion 13 is tangent to the concave portion at the inner edge of the machining surface 11 in the longitudinal section of the main body 10, the extension line of the tangential line and the machining surface 11 Forms an angle β of 20 to 30 °. By defining the angle of the relief portion 13 with respect to the processing surface 11, as with the shoulder portion 12, the area where the finishing tool 1 contacts the groove bottom surface 21 is reduced, and the processing surface 11 presses the groove bottom surface 21. The force can be stably supported from the base end side of the columnar main body 10, and the member to be cut 2 can be plastically deformed to stably form the smooth surface 21b. In the finishing process, the cutting mark 21a is first crushed in contact with a portion between the inclined surface of the shoulder portion 12 and the processing surface 11 to be plastically deformed. However, on the front side in the processing direction, the cutting trace 21a may not be completely plastically deformed, and the shape may be slightly restored due to elastic deformation. In the present embodiment, when a tangent line is drawn on the concave portion at the inner edge of the processed surface 11 in the longitudinal section of the main body 10, the angle β formed between the extended line of the tangent line and the processed surface 11 is inclined to the shoulder 12 By setting the same range as the angle α, the cutting trace 21a that has been restored by elastic deformation can be reliably crushed even on the rear side in the machining direction, and the cutting trace 21a can be reliably plastically deformed. That is, on the rear side in the processing direction, the end of the escape portion 13 has the same action as the shoulder portion 12 on the front side in the processing direction. Therefore, the angle β is defined as 20 to 30 °. This angle β is preferably the same as the inclination angle α of the shoulder 12 with respect to the processed surface 11.

  In the present embodiment, the width W of the processed surface 11 is, for example, 0.2 to 0.25 mm as described above. When the width W of the processed surface 11 is less than 0.2 mm, the processed surface 11 comes into contact with the groove bottom surface 21 in a form that is substantially close to line contact, and the processed surface 11 having a sharp tip is the end thereof. The groove bottom surface 21 is cut at the portion, and the finishing tool 1 itself is easily crushed at the contact portion. On the other hand, even when the width W of the machining surface 11 exceeds 0.25 mm, the area where the machining surface 11 contacts the groove bottom surface 21 increases, and the groove bottom surface 21 is cut to generate shavings. Moreover, when crushing the cutting trace 21a, the tool may be burned and the finished surface may not be formed smoothly. Therefore, the width of the processed surface 11 is defined as 0.2 to 0.25 mm. The diameter d1 of the relief portion 13 determines the width of the processed surface 11 of the main body 10 as described above, adjusts the contact area between the processed surface and the groove bottom surface 21, and adjusts the width of the smooth surface 21b. You can decide to do that. The width of the smooth surface 21b needs to be determined in consideration of the width of the sealing member and the sealing performance. That is, when a sealing member such as an O-ring is placed on the groove bottom surface 21, the sealing property is better when the contact area between the sealing member and the groove bottom surface 21 is substantially equal to the width of the smooth surface 21b. In addition, considering the degree of finishing, there is no waste and it is efficient.

  By forming the smooth surface 21b on the groove bottom surface 21 through the above steps, the seal member comes into surface contact with the smooth surface 21b of the groove bottom surface 20 without a gap when the seal member is interposed. And the airtightness by a sealing member is ensured and the reliability of components, such as a vacuum chamber, improves.

  The tool 1 for finishing a sealing surface according to this embodiment has a simple structure. Moreover, since the processing surface 11 that presses the groove bottom surface 21 is provided in an annular shape, the smooth surface 21b is always formed with the same width along the movement locus. Accordingly, even when the holder 30 is attached to the machine tool 3 that does not have a mechanism for rotating and finished, the sealing surface can be stably finished.

  Further, by providing the relief portion 13 and the shoulder portion 12, the area where the machining surface 11 contacts the groove bottom surface 21 of the workpiece 2 can be kept small, and cutting of the groove bottom surface along with the increase of the contact area, shavings. Generation and seizure can be prevented.

  Further, the sealing surface finishing tool 1 of the present embodiment is provided with a compression spring spring 15 as a pressing member. Thereby, the pressing force to the groove bottom face of the machining surface can be made constant, and the seizure of the tool and the generation of shavings due to the excessively large pressing force can be prevented.

  Then, when the movement of the main body 10 on the groove bottom surface 21 is made to circulate a plurality of times and the finishing process by the finishing tool 1 is repeated a plurality of times, the indentation remaining on the smooth surface 21b is further disappeared and the surface is made. Further smoothing can be achieved.

  In this embodiment, the compression spring 15 is provided as a pressing member. However, the pressing member is not limited to an elastic member, and may be a pneumatic or hydraulic type between the cylindrical main body 10 and the holder 30 of the machine tool 3. A cylinder may be provided, and the pressing force of the machining surface 11 against the groove bottom surface 21 may be controlled by the cylinder, or an air pressure or hydraulic pressure adjusting device may be provided separately from the main body 10, and the air pressure or the hydraulic pressure adjusting device may provide pressure. You may control the pressing force with respect to the groove bottom face of the process surface 11 with the controlled pressurization mechanism.

  Also, as shown in FIG. 4, if the lubricating oil supply hole 14 communicating with the concave relief portion 13 is provided and the lubricating oil is supplied to the processing surface 11 during the finishing process, the lubricating oil is supplied from the lubricating oil supply hole 14. Due to the lubricating action of the lubricating oil thus made, the relative movement of the tool for finishing the sealing surface becomes smooth, and the seizure of the tool is more reliably prevented.

  1: Finishing tool (for sealing surface), 1a: Finishing tool, 10: Main body, 11: Working surface, 12: Shoulder part, 13: Relief part, 14: Lubricating oil supply hole, 15: Compression spring spring , 16: groove, 2: member to be cut, 20: groove, 21: groove bottom, 21a: cutting trace, 21b: smooth surface, 22: rotary cutting tool, 23: recess, 3: machine tool, 30: holder, 30a: screw, 30b: screw, 4: seal member

Claims (5)

In a sealing surface finishing tool for finishing a sealing surface that has been cut using a rotary cutting tool,
The body,
An annular flat processing surface that is formed on the tip side of the main body and contacts the sealing surface;
A shoulder portion that is formed on the outside of the main body so as to surround the processing surface and is inclined toward the base end side of the main body at an angle of 20 to 30 ° with respect to the processing surface in the longitudinal section of the main body;
An escape portion formed in a concave shape in a region surrounded by the processing surface;
A pressing member that presses the base of the main body toward the distal end side; and
Have
An angle formed between an extension line of the tangent line and the machining surface when the tangent line is drawn in the concave shape at the inner edge of the machining surface in the longitudinal section of the main body, is 20 to 30 °,
The sealing surface is characterized by finishing the sealing surface by bringing the processing surface into contact with the cutting surface by the rotary cutting tool with a pressing force and moving the main body parallel to the processing surface. Finishing tool.   2. The tool for finishing a sealing surface according to claim 1, wherein a width of the annular processing surface is 0.2 to 0.25 mm.   The tool for finishing a sealing surface according to claim 1, wherein the pressing member is an elastic member that biases the base end portion of the main body toward the distal end side.   4. The sealing surface finishing tool according to claim 3, wherein the elastic member is a compression spring spring.   The sealing surface according to any one of claims 1 to 4, wherein the relief portion is a hole that opens at a front end portion of the main body, and the lubricating oil is supplied to the processing surface through the hole. Finishing tool.

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