JP7065055B2 - Deburring tool and deburring method - Google Patents

Description

The present invention relates to a deburring tool and a deburring method.

A machining tool mounted on the spindle of a machine tool, which includes a shank, a case in which the shank is supported so that it can rotate, a positioning engagement part arranged in the case, and an absorption rod arranged in the shank. A machine tool has been proposed that includes a tilting case, a tilting support pin device that supports the tilting case, a holder that is rotatably arranged in the tilting case, and a universal joint that connects the absorption rod and the holder (patented). Document 1).

Japanese Patent No. 4665440

In order to use the deburring tool of Patent Document 1, it is necessary to arrange a fixing portion that engages with the positioning engaging portion on the machine tool.
The present invention provides a deburring tool and a deburring method that do not include a positioning engagement portion.

The first aspect of the present invention is a deburring tool.
A housing with a shank, seat and mechanism chamber arranged along the shank axis,
A plurality of transmission rods arranged around the shank shaft in parallel with the shank shaft and fixed to the mechanism chamber,
A recovery rod that has a first flange and can reciprocate along the shank axis.
It ’s a tilting shaft,
The second flange portion, which is arranged so as to face the first flange portion,
The receiving part through which the transmission rod penetrates, and the receiving part, respectively.
It has a spherical bush, which is supported by the bearing surface and has a tilt center on the shank axis.
A tilting shaft arranged along the tilting axis passing through the tilting center and capable of tilting around the tilting center,
An elastic member that urges the recovery rod toward the tilting shaft, and
A holder that is arranged on the tilting shaft and fixes a blade so that it can rotate by a predetermined rotation angle with respect to the tilting shaft.
The holder has a plunger that can move along the tilt axis, and when the holder rotates by the rotation angle in the direction opposite to the rotation direction of the shank, the first flange portion and the second flange portion A rotary linear motion conversion mechanism that brings the plunger into contact with the recovery rod on the tilting shaft at a distance.
To prepare for.
The second aspect of the present invention is a deburring method.
The transmission rod fixed to the housing abuts on the receiving portion formed on the second flange portion of the tilting shaft, and the rotation of the housing is transmitted to the tilting shaft.
At the time of non-machining, the first flange portion of the recovery rod is urged toward the second flange portion of the tilting shaft.
At the time of processing
The holder that holds the blade due to the cutting resistance received from the work rotates with respect to the tilting shaft in the direction opposite to the rotation direction of the blade.
The rotation linear motion conversion mechanism converts the rotation of the holder to move the plunger to the recovery rod side.
The plunger pushes up the recovery rod and comes into contact with the recovery rod on the tilting shaft, and the first flange portion is separated from the second flange portion.
The blade that rotates integrally with the tilting shaft cuts the work.
The method.

The deburring tool is attached to machine tools such as machining centers and turning centers and is used as a rotary tool. In the deburring tool, the shank is attached to the tool spindle, and the entire deburring tool rotates together with the tool spindle.
For convenience of explanation, the side where the blade is attached is called the tip side, and the side where the shank is arranged is called the base end side.

The recovery rod, spherical bush, bearing surface, holder, plunger and blade are arranged on the shank axis, which is the central axis of the shank.
The guide holes and transmission rods are evenly distributed on the circumference and arranged in the same number on the cylindrical surface centered on the shank axis.
The receiving portions may be evenly distributed on the circumference in a cylindrical surface shape centered on the tilting axis, and may be arranged in the same number as the transmission rods. The receiving portion may have a contact surface on a plane passing through the shank axis.

When the blade comes into contact with the work, the blade receives cutting resistance. Due to the cutting resistance that the blade receives from the work, the holder that holds the blade rotates with respect to the tilting shaft in the direction opposite to the direction of rotation of the deburring tool. The amount of rotation is determined by the structure of the rotational linear motion conversion mechanism.
The blade may include a brush.

The rotary linear motion conversion mechanism has a plunger. The plunger moves along the tilting axis, which is the central axis of the tilting shaft. The rotation linear motion conversion mechanism pushes up the plunger toward the base end as the holder rotates in the direction opposite to the rotation direction. The plunger reciprocates by a structurally determined stroke with respect to a predetermined rotation angle of the holder.
When the holder rotates in the direction opposite to the direction of rotation of the deburring tool, the plunger pushes the recovery rod toward the base end side against the urging force of the elastic member. The plunger pushes up the recovery rod to separate the first flange portion and the second flange portion. The top of the plunger abuts on the tilt axis with the recovery rod, allowing the tilt shaft to tilt freely.
When the holder rotates to the end opposite to the direction of rotation of the deburring tool, the top of the plunger comes into contact with the recovery rod near the center of tilt.
The rotary linear motion conversion mechanism is, for example, a cylindrical groove cam mechanism. The cylindrical groove cam mechanism has a cam pin and a plunger. The plunger has a cam groove and is arranged inside the holder so as to be reciprocable and non-rotatable. The plunger moves along the tilt axis. The top of the plunger is on the tilt axis. The cam pin extends and is fixed to the tilt shaft perpendicular to the tilt axis. The cam groove preferably penetrates the plunger. The cam groove has an opening that draws a spiral on the cylindrical surface of the plunger. The cam pin slides in the cam groove.
The holder has a swivel hole that spreads in a fan shape around the tilt axis on a plane perpendicular to the tilt axis. The cam pin penetrates the swivel hole. The central angle of the swivel hole is equal to or greater than the rotation angle of the cam groove.
As the holder rotates in the direction of rotation of the tool with respect to the tilt shaft, the plunger moves toward the tip. When the plunger is at the distal end, the first flange abuts the second flange. Preferably, the top of the plunger is in contact with the recovery rod at this time.

When the blade does not come into contact with the workpiece, the urging force of the spring causes the recovery rod to push down on the plunger. The rotary linear motion conversion mechanism rotates the holder in the rotational direction of the deburring tool with respect to the tilting shaft when the plunger is pushed down. As a result, the holder and the plunger return to their initial positions. Then, the first flange portion comes into contact with the second flange portion. At this time, the tilting shaft cannot be tilted.

According to the present invention, it is possible to provide a deburring tool and a deburring method that do not include a positioning engaging portion.

Longitudinal cross-sectional view of the deburring tool in the non-machining embodiment of the embodiment FIG. 1 is a sectional view taken along line II-II. Section III-III sectional view of FIG. FIG. 1 is a sectional view taken along line IV-IV. FIG. 1 is a sectional view taken along line VV. Perspective view of the plunger of the embodiment Explanatory diagram of the moving stroke of the plunger Vertical cross-sectional view of the deburring tool during machining of the embodiment IX-IX line sectional view of FIG. X-ray cross-sectional view of FIG. Vertical cross-sectional view showing a deburring tool with the tilting shaft tilted.

As shown in FIG. 1, the deburring tool 100 of the embodiment includes a housing 1 having a shank 11, a set of transmission rods 3, a tilting shaft 4, a recovery rod 5, a spring 6, a holder 7, a spherical bush 24, and a rotary straight line. The dynamic conversion mechanism 9 is included. The rotation linear motion conversion mechanism 9 includes a plunger 8, a cam groove 85, a cam pin 84, and a detent mechanism 87.
The deburring tool 100 is used by mounting the shank 11 on a spindle (not shown) of a machine tool such as a machining center, and rotating the entire deburring tool 100 together with the blade 101.
Hereinafter, for convenience of explanation, the direction along the shank axis 15 or the tilt axis 43 may be referred to as a vertical direction.

Housing 1 has a body 12, a mechanism chamber 13 and a seat surface 14. The housing 1 may have an adjusting screw 61. The shank 11 is, for example, a straight shank. The shank 11 extends along the shank axis 15.
The body 12 is arranged on the tip end side of the shank 11. The body 12 has a cylindrical shape centered on the shank shaft 15.
The mechanism chamber 13 is a stepped cylinder centered on the shank shaft 15 and extends inside the shank 11 and the body 12. The mechanism chamber 13 has a small diameter portion 13a arranged at the base end portion and a large diameter portion 13b arranged at the tip end portion. The bush 53 may be arranged on the small diameter portion 13a. The small diameter portion 13a may have an opening 13c on the base end side of the shank 11. A female screw 11a is arranged in the opening 13c. The adjusting screw 61 is screwed into the female screw 11a.
The seat surface 14 is a right-conical inner surface arranged at the tip end portion of the mechanism chamber 13 and whose diameter is reduced toward the tip end side. The seat surface 14 may be a concave spherical surface.

The spherical bush 24 has a spherical surface 24a which is a convex surface. The center of the spherical surface 24a is the tilting center 25. The spherical surface 24a is inscribed in the seat surface 14. The spherical bush 24 slides on the seat surface 14.

The transmission rod 3 has a shaft portion 33 and a bulging portion 34. The transmission rod 3 is arranged inside the mechanism chamber 13 in parallel with the shank shaft 15. A plurality of transmission rods 3 are arranged on the circumference of a straight cylindrical surface 16 (see FIG. 2) centered on a shank shaft 15. The transmission rods 3 may be arranged at equal intervals on the circumference. For example, 5 to 7 transmission rods 3 are arranged. The transmission rod 3 is fixed to the housing 1. The transmission rod 3 penetrates the guide hole 51a and the receiving portion 41a.
The outer surface of the bulging portion 34 is a convex spherical surface. The center of the bulging portion 34 is arranged on a plane perpendicular to the shank axis 15 and passing through the tilting center 25 of the tilting shaft 4. The bulging portion 34 is arranged in the receiving portion 41a with a slight amount of play.

The recovery rod 5 has a stem 52, a first flange portion 51, and a guide hole 51a. The first flange portion 51 is a disk centered on the shank shaft 15. The recovery rod 5 may have a convex portion 56, an abutting portion 54, and a bush 55. The convex portion 56 has a cylindrical shape and is arranged at the tip end portion of the first flange portion 51. The concave portion 51b is arranged on the shank shaft 15 at the tip of the convex portion 56. The contact portion 54 is mounted in the recess 51b. The tip surface 54a of the contact portion 54 is a plane perpendicular to the shank axis 15. The tip surface 54a may protrude toward the tip side from the outer peripheral portion of the first flange portion 51, may be recessed toward the base end side, or may be on the same surface.
The stem 52 has a cylindrical shape and is arranged in the small diameter portion 13a. The stem 52 is slidably supported by the small diameter portion 13a or the bush 53.
The same number of guide holes 51a are arranged as the transmission rods 3. The guide hole 51a is a cylindrical hole and is arranged in the first flange portion 51. The guide hole 51a extends parallel to the shank shaft 15 and is arranged on the circumference of the straight cylindrical surface 16. The bush 55 is arranged at the inner diameter of the guide hole 51a.
The transmission rod 3 penetrates the guide hole 51a. The shaft portion 33 slides on the guide hole 51a or the bush 55.
In the recovery rod 5, the stem 52 is guided by the small diameter portion 13a, and the guide hole 51a is guided by the shaft portion 33 so that the recovery rod 5 can reciprocate in the vertical direction.

The spring 6 is, for example, a coil spring or a disc spring. The spring 6 urges the recovery rod 5 toward the tip end. The spring 6 is supported by the recovery rod 5 and the adjusting screw 61. The adjusting screw 61 adjusts the initial length of the spring 6.

The tilting shaft 4 includes a rod portion 42, a second flange portion 41, and a set of receiving portions 41a. The tilting shaft 4 extends along the tilting shaft 43. The tilt axis 43 passes through the tilt center 25. The tilting shaft 4 is supported by the seat surface 14 via the spherical bush 24.
The rod portion 42 has a hollow cylindrical shape. The rod portion 42 is arranged on the tip end side of the second flange portion 41 and extends below the housing 1. The second flange portion 41 is a disk centered on the tilting shaft 43. The receiving portion 41a is arranged on the second flange portion 41.
The receiving portion 41a is a hole that penetrates the second flange portion 41 in the vertical direction. As shown in FIG. 2, the receiving portions 41a are evenly arranged on the right cylindrical surface 44 centered on the tilting shaft 43. The right-sided cylinder surface 44 has the same diameter as the right-sided cylinder surface 16. The number of receiving portions 41a is arranged in the same number as the transmission rods 3. The receiving portion 41a has a contact surface 41b. The contact surface 41b is the wall surface of the receiving portion 41a on the rotation direction side of the blade 101. The contact surface 41b constitutes a part of a plane (for example, a plane 102) including the tilting shaft 43. The contact surface 41b is arranged corresponding to the position of the transmission rod 3. For example, when the transmission rods 3 are evenly arranged on the circumference, the contact surface 41b is also evenly arranged on the circumference. The receiving portion 41a is, for example, rectangular when viewed from the axial direction of the tilting shaft 43. When the tilting shaft 4 is tilted, the receiving portion 41a has a size such that the transmission rod 3 does not come into contact with anything other than the contact surface 41b.

As shown in FIGS. 1 and 5, the holder 7 is arranged inside the rod portion 42 in the radial direction. The holder 7 is supported so that the tilting shaft 43 is suppressed from moving in the axial direction and can rotate about the tilting shaft 43 by a turning angle 78 (see FIG. 4).
The deburring tool 100 may include a ball holding hole 42a, an annular groove 71, and a ball 72.
The ball holding hole 42a is arranged in the rod portion 42. A plurality of ball holding holes 42a (two in FIG. 5) are formed at equal intervals on the circumference extending in the radial direction.
The annular groove 71 has a substantially semicircular vertical cross section and extends in the circumferential direction of the holder 7. The annular groove 71 may be arranged over the entire circumference.
The ball 72 is held between the ball holding hole 42a and the annular groove 71, and rolls on the annular groove 71.
The ball holding hole 42a may extend in the radial direction and penetrate the rod portion 42. In this case, the holding cylinder 73 is arranged on the radial outer side of the ball holding hole 42a. The holding cylinder 73 has a hollow cylindrical shape and is arranged outside the ball holding hole 42a. The ball 72 is held by the holding cylinder 73.

As shown in FIGS. 1 and 4, the holder 7 has a holding hole 74 and a swivel hole 77, and has a hollow cylindrical shape.
The holding hole 74 is a cylindrical hole extending along the tilting shaft 43. The holding hole 74 penetrates the holder 7.
The swivel hole 77 extends along a plane perpendicular to the tilt axis 43. With reference to FIG. 4, the swivel hole 77 expands in a fan shape around the tilting shaft 43. The widening central angle of the swivel hole 77 is the swivel angle 78. The vertical width of the swivel hole 77 is larger than the diameter of the cam pin 84. The turning angle 78 is equal to or larger than the turning angle φ.
The holder 7 may have a collet 75. The collet 75 is attached to the tip of the holding hole 74. The collet 75 holds the blade 101. For example, the holding hole 74 has a female screw 74a, and the collet 75 has a male screw 75a on its outer peripheral portion. The collet 75 is screwed to the female screw 74a.

As shown in FIG. 6, the plunger 8 has a cannonball shape and has a tubular portion 82, a top portion 81, and a cam groove 85. The plunger 8 is arranged inside the holding hole 74.
The tubular portion 82 is a cylinder centered on the tilting shaft 43. The tubular portion 82 may be hollow. The tubular portion 82 slides on the holding hole 74.
The top portion 81 is arranged so as to project toward the base end side of the tubular portion 82. The top 81 is hemispherical. The top 81 abuts on the abutting portion 54. The center of the top 81 is located on the tilt axis 43.

The cam groove 85 is a spiral groove. The cam groove 85 penetrates the plunger 8 in a direction orthogonal to the tilt axis 43. The cam groove 85 has an opening 85a in the cylindrical surface 82a of the tubular portion 82. The opening 85a is configured to draw a spiral along the cylindrical surface 82a. The opening 85a faces the tip direction as it rotates along the rotation direction of the blade 101. For example, when the blade 101 rotates clockwise when viewed from the proximal end direction, the opening 85a is spiraled upward to the right. As shown in FIG. 7, the cam groove 85 satisfies the following equation.
L = φDtanA
here,
A: Lead angle of spiral groove φ: Rotation angle (rad)
D: Diameter of the plunger (cam groove part) L: Movement stroke of the plunger

For example, the lead angle A is 15 ° to 20 °, and the rotation angle φ is 60 ° to 120 °. The width of the cam groove 85 is substantially equal to the diameter of the cam pin 84.

When the plunger 8 is at the end in the proximal direction, the apex 86 of the apex 81 is located near the tilt center 25.

The detent mechanism 87 limits the rotation of the plunger 8 with respect to the holder 7. The detent mechanism 87 has, for example, a holding hole 79, an elongated hole 83, and a detent pin 76.
As shown in FIGS. 1 and 3, the holding hole 79 is arranged in the holder 7. The holding hole 79 extends orthogonally to the tilt axis 43 and penetrates the holder 7. The inner diameter of the holding hole 79 is substantially the same as that of the detent pin 76.
The slotted hole 83 is arranged in the plunger 8. The slotted hole 83 penetrates the tubular portion 82 in a direction orthogonal to the tilting axis 43. The slotted hole 83 extends along the tilting shaft 43. The vertical length of the slot 83 is substantially the same as the moving stroke L of the plunger 8.
The detent pin 76 is supported by the holding hole 79. The detent pin 76 extends radially in the holder 7 and is arranged in the holder 7. The detent pin 76 penetrates the slotted hole 83. The detent pin 76 slides on the slotted hole 83.
The plunger 8 is restricted in rotation with respect to the holder 7 and can move in the axial direction.

As shown in FIG. 4, the cam pin 84 extends radially and is arranged on the rod portion 42. The cam pin 84 may be fixed to the rod portion 42. The cam pin 84 penetrates the swivel hole 77 and the cam groove 85. The cam pin 84 slides on the swivel hole 77 and the cam groove 85.

The operation of the deburring tool 100 of this embodiment will be described.
The shank 11 is attached to the spindle (not shown) of the machine tool. Housing 1 rotates with the spindle. The rotation of the housing 1 is transmitted to the tilting shaft 4 via the transmission rod 3. The blade 101, the holder 7, and the tilting shaft 4 rotate together.

As shown in FIG. 1, when the blade 101 is not in contact with the work 103 (see FIG. 8), the first flange portion 51 abuts on the second flange portion 41 due to the elastic force of the spring 6, and the second flange portion Encourage 41. The tilting shaft 43 and the shank shaft 15 are held in the same state.

The machine tool moves the deburring tool 100 while rotating it. The blade 101 comes into contact with the work 103. Then, the blade 101 receives the cutting resistance, and the holder 7 rotates with respect to the tilting shaft 4 in the direction opposite to the rotation direction of the deburring tool 100. As shown in FIGS. 8 to 10, the plunger 8 is moved toward the proximal end by the rotary linear motion conversion mechanism 9. The plunger 8 pushes up the recovery rod 5 toward the proximal end. The first flange portion 51 is separated from the second flange portion 41. The top portion 81 abuts on the tilting shaft 43 with the abutting portion 54 in a state where the tilting shaft 43 coincides with the shank shaft 15. The tilting shaft 4 is in a state where it can be tilted.
When the holder 7 rotates with respect to the tilting shaft 4 by the rotation angle φ, the plunger 8 moves to the end in the proximal direction. The contact position between the top portion 81 and the contact portion 54 is near the tilt center 25.

As the spindle moves, the blade 101 moves along the ridgeline of the work 103 to scrape the work 103. At this time, the recovery rod 5 urges the tilting shaft 4 toward the tip end via the plunger 8 and the cam pin 84 by the elastic force of the spring 6. The spherical bush 24 is slidably supported by the seat surface 14, and the tilting shaft 4 can be tilted about the tilting center 25 (see FIG. 11).

When the blade object 101 is separated from the work 103 again, the blade object 101 is not subjected to cutting resistance. Then, the recovery rod 5 pushes down the plunger 8 toward the tip by the elastic force of the spring 6. The recovery rod 5 moves smoothly with the stem 52 guided by the bush 53 and the guide hole 51a guided by the shaft portion 33. As the plunger 8 moves toward the tip end, the holder 7 rotates in the rotation direction of the blade 101 with respect to the tilting shaft 4. The first flange portion 51 abuts on the second flange portion 41. The tilting shaft 43 reduces the tilt with respect to the shank shaft 15 as the recovery rod 5 moves toward the tip end. The recovery rod 5 and the plunger 8 reach the end in the tip direction. The tilt axis 43 coincides with the shank axis 15.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention, and all the technical matters included in the technical idea described in the claims are all. It is the subject of the present invention. Although the above-described embodiment shows a suitable example, those skilled in the art can realize various alternative examples, modified examples, modified examples, or improved examples from the contents disclosed in the present specification. These are included in the technical scope set forth in the appended claims.

1 Housing 11 Shank 13 Mechanism room 14 Seat surface 15 Shank shaft 24 Spherical bush 25 Tilt center 3 Transmission rod 34 Swelling part 4 Tilt shaft 41 2nd flange part 41a Receptive part 41b Contact surface 43 Tilt shaft 5 Recovery rod 51 1st Flange 51a Guide hole 6 Spring (elastic member)
61 Adjusting screw 7 Holder 71 Circular groove 72 Ball 76 Anti-rotation pin (Anti-rotation mechanism)
8 Plunger 81 Top 83 Long hole (anti-rotation mechanism)
84 cam pin (rotational linear motion conversion mechanism)
85 Cam groove (rotational linear motion conversion mechanism)
87 Anti-rotation mechanism 9 Rotational linear motion conversion mechanism 100 Deburring tool 101 Blade

Claims (11)

A housing with a shank, seat and mechanism chamber arranged along the shank axis,
A plurality of transmission rods arranged around the shank shaft in parallel with the shank shaft and fixed to the mechanism chamber,
A recovery rod that has a first flange and can reciprocate along the shank axis.
It ’s a tilting shaft,
The second flange portion, which is arranged so as to face the first flange portion,
The receiving part through which the transmission rod penetrates, and the receiving part, respectively.
It has a spherical bush, which is supported by the bearing surface and has a tilt center on the shank axis.
A tilting shaft arranged along the tilting axis passing through the tilting center and capable of tilting around the tilting center,
An elastic member that urges the recovery rod toward the tilting shaft, and
A holder that is arranged on the tilting shaft and fixes a blade so that it can rotate by a predetermined rotation angle with respect to the tilting shaft.
The holder has a plunger that can move along the tilt axis, and when the holder rotates in a direction opposite to the rotation direction of the shank, the first flange portion and the second flange portion are separated from each other. A rotary linear motion conversion mechanism that brings the plunger into contact with the recovery rod on the tilting shaft, and
Deburring tool equipped with. The rotation linear motion conversion mechanism brings the plunger into contact with the recovery rod at the tilt center when the holder rotates by the rotation angle in the direction opposite to the rotation direction of the shank.
The deburring tool according to claim 1. The rotary linear motion conversion mechanism is
A detent mechanism that limits the rotation of the plunger with respect to the holder,
The cam groove formed in a spiral shape on the plunger and
A cam pin that penetrates the tilting shaft and the cam groove perpendicularly to the tilting shaft, is arranged on the tilting shaft, and slides on the cam groove.
Have,
The deburring tool according to claim 1 or 2. The detent mechanism is
An elongated hole that penetrates the plunger in the radial direction and extends in the axial direction of the plunger,
It has a detent pin that penetrates the slot and is radially located in the holder.
The deburring tool according to claim 3. The transmission rod has a bulge that is perpendicular to the shank axis and is located on a plane passing through the center of tilt.
The receiving portion has a contact surface that abuts on the bulging portion.
The deburring tool according to any one of claims 1 to 4. The recovery rod is arranged in the first flange portion and has a plurality of guide holes through which the transmission rods pass.
The recovery rod is guided by sliding the guide hole with the transmission rod.
The deburring tool according to any one of claims 1 to 5. The deburring tool according to claim 6, wherein the recovery rod is guided by the transmission rod inserted into the guide hole formed in the first flange portion and the housing, and moves in the shank axial direction. The transmission rod fixed to the housing abuts on the receiving portion formed on the second flange portion of the tilting shaft, and the rotation of the housing is transmitted to the tilting shaft.
At the time of non-machining, the first flange portion of the recovery rod is urged toward the second flange portion of the tilting shaft.
At the time of processing
The holder that holds the blade due to the cutting resistance received from the work rotates with respect to the tilting shaft in the direction opposite to the rotation direction of the blade.
The rotation linear motion conversion mechanism converts the rotation of the holder to move the plunger to the recovery rod side.
The plunger pushes up the recovery rod and comes into contact with the recovery rod on the tilting shaft, and the first flange portion is separated from the second flange portion.
The blade that rotates integrally with the tilting shaft cuts the work.
Deburring method. In addition,
The holder rotates by a predetermined rotation angle, and the plunger comes into contact with the recovery rod at the center of tilt.
The deburring method of claim 8. In addition,
The elastic member urges the recovery rod toward the tilting shaft.
The deburring method according to claim 8 or 9. In addition,
The transmission rod guides the recovery rod, and the recovery rod moves.
The deburring method according to any one of claims 8 to 10.

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