JP2009101379A - Rotary friction welding method for pipe and rotary friction welding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary friction welding method for a pipe and a rotary friction welding device capable of cutting an inside burr while minimizing restriction of the inner face shape of a work piece with a simple constitution. <P>SOLUTION: In the rotary friction welding device 100, a second pipe rotary pressing means 20, a first pipe holding means 10 and an inside burr cutting means 40 are linearly arranged, and a second pipe 2 which is rotated and pressed by the second pipe rotary pressing means 20 is connected to a first pipe 1 held by the first pipe holding means 10. In parallel to or immediately after the connection, the inside burr cutting means 40 inserts an inside burr cutting knife 41 into the first pipe 1 from the front end part 1b of the first pipe 1 opposite to the second pipe 2. During the rotation of the joint body of the first pipe 1 and the second pipe 2 by the second pipe rotary pressing means 20, the inside burr cutting means 40 moves the inside burr cutting knife 41 to the joint part (the rear end face 2b and the front end face 1a are joined), and cuts the inside burr formed on the joint part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating friction welding method and a rotating friction welding apparatus for a tubular body, and more particularly to a rotating friction welding method and a rotating friction welding apparatus for a tubular body that can quickly remove burrs generated by the rotating friction welding.

  The drilling pipe (hereinafter referred to as “drill pipe”) used for drilling oil wells is a thick-walled pipe that is thick and short threaded at the tip of a steel pipe (hereinafter referred to as “drill pipe body”). A certain tool joint is a rotational friction welding (hereinafter, may be abbreviated as “friction welding” or “pressure welding”). In rotary friction welding, the tool joint is rotated while pressing the end faces of the drill pipe tube body and the tool joint against each other. At this time, the respective predetermined ranges are heated by the frictional heat generated on the sliding surface. Both are solid-phase bonded by stopping the rotation and pressing strongly. At this time, on the outer periphery and the inner periphery of the joint portion, “outer surface burr” and “inner surface burr” (hereinafter sometimes referred to as “burr” together or both) may be formed by plastic deformation. Such burrs are mechanically removed.

Then, since the burrs after the pressure welding are in a quenched state by air cooling, it is difficult to cut with a lathe as they are, so that “annealing heat treatment” by high frequency heating is required. Then, after the pressure welding, the drill pipe was removed from the pressure welding device, and after being installed in another cutting device, it was necessary to cut the burr, and the work efficiency was extremely poor.
Therefore, a friction welding machine that can deburr without the need to remove the work piece (corresponding to the integrated drill pipe body and tool joint) following the pressure welding process has been developed (for example, a patent) Reference 1).

JP-A-7-75885 (page 9-10, FIG. 2)

  The invention disclosed in Patent Document 1 holds one of the workpieces (corresponding to a tool joint) and rotates the same while rotating the other workpiece (corresponding to a drill pipe tube). ) Cylindrical main shaft for pressing against the outer surface, outer surface burr cutting means facing the outer surface of one of the workpieces (corresponding to a tool joint), and one of the workpieces (corresponding to a tool joint) penetrating the main shaft And an internal burr cutting means which can enter the inside.

  Then, after the press contact is completed, the position of the outer surface burr tip of the outer surface burr cutting means is adjusted, and the outer surface burr is cut while rotating the main shaft. Further, during or after the press-welding process, the position of the inner-surface burr tip of the inner surface burr cutting means is positioned in the vicinity of the joint, and the inner-surface bite chip (exactly speaking, in the direction opposite to the rotation direction of the main shaft) , The cutting shaft body on which the inner surface bite tip is installed) is rotated, and the formed inner surface burr is immediately cut in the pressure welding process including the heating process and the upsetting (pressing) process or immediately after the pressure welding process. .

Therefore, it is possible to cut the outer surface burrs and the inner surface burrs without having to remove the workpiece (corresponding to the drill pipe main body and the tool joint joined) following the press contact process. Furthermore, the soft burr before hardening can be cut, and the cutting time of the internal burr is shortened. However, the invention has the following problems although the above-described effects are exhibited.
(A) Since the inner surface burr cutting means that rotates independently of the main shaft is arranged in the main shaft that rotates, the number of parts increases and the structure becomes complicated, which increases the manufacturing cost and maintenance cost. In other words, the reliability of the pressure welding machine decreases.
(Ii) Compared to the end of the tool joint on the side of the joint with the drill pipe body, the end opposite to the joint (same as the end to which the drilling tool is connected) is thickened on the inner surface side. (In some cases, the inner and outer surfaces are increased in thickness) From the end where the inner diameter is reduced by increasing the thickness on the inner surface side, the inner surface burr cutting means is inserted to form a joint with a larger inner diameter. Internal burr cannot be cut.

  The present invention has been made to solve such a problem, and has a simple configuration in which an increase in the number of parts is minimized, and is provided on the inner surface side of a workpiece (corresponding to a tool joint). It is an object of the present invention to provide a method for rotating friction welding of a tubular body and a rotating friction welding apparatus capable of cutting inner surface burrs regardless of the increased thickness.

(1) A rotating friction welding method for a tubular body according to the present invention is a rotating friction welding method for a tubular body, wherein the second tubular body is pressed and joined to the first tubular body while rotating,
Arranging the first tubular body and the second tubular body coaxially with their end faces facing each other;
Inserting an internal burr cutting tool from an end far from the second tube near an end near the second tube inside the first tube;
While rotating the second tubular body, pressing the second tubular body against the first tubular body and holding them together,
While moving the first tubular body and the second tubular body in a joined state, moving the inner surface burr cutting blade to the joint portion between the first tubular body and the second tubular body, Cutting an internal burr formed at the joint.

  (2) In (1), the step of inserting the inner surface burr cutting blade and the step of joining the first tube body and the second tube body are performed in parallel.

(3) In the above (1) or (2), a step of previously arranging an outer surface burr cutting blade facing the side surface of the second tubular body;
By moving the outer surface burr cutting blade to the joint portion of the first tube body and the second tube body while rotating the first tube body and the second tube body in the joined state, And cutting an outer surface burr formed at the joint.

  (4) In (3), the step of cutting the inner surface burr and the step of cutting the outer surface burr are performed in parallel.

(5) Moreover, the rotary friction welding apparatus for a tubular body according to the present invention includes a first tubular body gripping means for gripping the first tubular body in a non-rotatable manner,
The first tubular body gripped by the first tubular body gripping means is opposed to the end surface, and the second tubular body is gripped and rotated coaxially with the first tubular body, and the end surface of the second tubular body Second tube rotation pressing means that presses against the end surface of the first tube,
An inner surface burr cutting means for inserting an inner surface burr cutting blade into the first tube body from an end surface far from the second tube body,
While rotating the second tubular body, the second tubular body is pressed against the first tubular body in a gripped state and joined together, and then the first tubular body and the second tubular body in the joined state Control means for cutting the inner surface burr formed on the joint by moving the inner surface burr cutting blade to the joint between the first tube and the second tube while rotating the body; Have

  (6) In the above (5), the control device, while rotating the second tube, presses the second tube to the gripped first tube and joins them together. The inner surface burr cutting blade is preliminarily disposed near an end surface close to the second tubular body inside the first tubular body.

(7) In the above (5) or (6), the inner surface burr cutting means comprises:
A blade installation bar on which the inner surface burr cutting blade is installed;
A pinch roll drive mechanism for gripping the blade setting bar and moving it forward and backward;
A screw drive mechanism for grasping the blade installation rod and moving it forward and backward;
The speed at which the pinch roll drive mechanism advances / retreats is greater than the speed at which the screw drive mechanism advances / retreats.

(8) In any one of the above (5) to (7), an outer surface burr that is arranged side by side with the second tube body rotation pressing means and advances and retracts an outer surface burr cutting blade toward the side surface of the second tube body. Having cutting means,
The control means presses the second tubular body while pressing the second tubular body while rotating the second tubular body, joins the two, and then joins the first tubular body. The outer surface burr formed on the joint is cut by moving the outer surface burr cutting blade to the joint between the first tube and the second tube while rotating the first tube and the second tube. It is characterized by making it.

Since the rotational friction welding method according to the present invention is as described above, the following effects can be obtained.
(I) Since the inner surface burr cutting blade is inserted into the inside of the first tube gripped so as not to rotate from the end far from the second tube, the inner diameter of the joint portion of the second tube is large, Even when the inner diameter on the opposite side of the joint is small, the inner surface burr formed in the joint can be cut. That is, it can be used for joining a tool joint whose inner diameter increases toward the joint with the drill pipe body.
At this time, since the inner surface burr cutting blade is inserted into the first tube that is not rotating, the inner surface burr cutting blade does not inadvertently cut the inner surface of the first tube, and the inner surface burr cutting blade. The support mechanism is simplified. Moreover, since the inner surface burr cutting blade is cut by moving the inner surface burr cutting blade while rotating the joined first tube body and the second tube body, it is not necessary to turn the inner surface burr cutting blade blade, and the number of parts can be reduced. Increase is suppressed and the structure is simplified. Therefore, an increase in manufacturing cost and maintenance cost is suppressed, and the reliability of the pressure welding apparatus is improved.
Furthermore, since it is not necessary to remove the joined first tube body and the second tube body from the pressure welding apparatus and move to another apparatus for cutting the inner surface burr, the operation is simple and quick. Furthermore, since the inner surface burr is cut in a soft state before being cooled by air and cured, an annealing process is not required, the cutting time is shortened, and the tool life is extended. Therefore, the production efficiency is improved and the tool basic unit is improved.

  (Ii) Since the inner surface burr cutting blade is inserted during the joining step, the work time is reduced by the time required for the insertion, so that the production efficiency is further improved.

(Iii) Since the outer surface burr cutting tool is cut by moving the outer surface burr cutting blade while rotating the joined first tube and the second tube body, it is not necessary to rotate the outer surface burr cutting blade, The increase in the number of parts is suppressed, and the structure is simplified. Therefore, an increase in manufacturing cost and maintenance cost is suppressed, and the reliability of the pressure welding apparatus is improved.
Furthermore, since it is not necessary to remove the 1st pipe body and the 2nd pipe body in the state joined from the pressure welding apparatus, and to move to another apparatus for cutting an outer surface burr | flash, work becomes simple and quick. Furthermore, since the outer surface burr is cut in a soft state before being cooled by air and cured, the cutting time is shortened and the tool life is extended. Therefore, the production efficiency is improved and the tool basic unit is improved.

  (Iv) Since the inner surface burr and the outer surface burr are cut simultaneously, the working time is shortened, and further, both the inner surface burr and the outer surface burr are cut in a soft state before being cured by air cooling, so that the cutting time is shortened. As a result, the tool life is extended. Therefore, the production efficiency (pressure contact efficiency) is improved and the tool basic unit is improved.

Moreover, since the rotational friction welding apparatus according to the present invention is as described above, the following effects can be obtained.
(V) Inner surface burr cutting means for inserting an inner surface burr cutting blade from the end surface far from the second tube into the first tube, and the first tube and the second tube joined after press contact, And the control means for cutting the inner surface burr by moving the inner surface burr cutting blade while rotating the blade, so that the same effect as the above (i) can be obtained. In addition, each equipment such as an induction annealing apparatus, an internal burr cutting lathe, and an external burr cutting lathe is not required, so that the manufacturing cost of the pressure welding apparatus can be reduced, and energy saving and the installation area of the equipment can be reduced.

  (Vi) Since the control device previously arranges the inner surface burr cutting blade near the press contact portion before press contact, the operation time is shortened and the production efficiency is improved.

  (Vii) Since the inner surface burr cutting means includes a pinch roll drive mechanism with a fast advance / retreat speed and a screw drive mechanism with a slow advance / retreat speed, the working time is shortened and the production efficiency is improved. Further, the inner surface deburring can be surely performed by the slow advance and retreat by the screw drive mechanism.

  (Viii) an outer surface burr cutting means for advancing and retracting the outer surface burr cutting blade toward the side surface of the second tube body, and after the pressure contact, the outer surface burr is rotated while rotating the joined first tube body and the second tube body. Therefore, the same effect as (iii) can be obtained. Further, if the inner surface burr and the outer surface burr are cut simultaneously, the same effect as the above (iv) can be obtained.

[Embodiment 1]
FIG. 1 is a side view schematically showing a rotary friction welding apparatus according to Embodiment 1 of the present invention. In FIG. 1, the size of each constituent member and the interval between them are not limited, and each constituent member is indicated by a symbol mark.
In FIG. 1, a rotary friction welding apparatus (hereinafter sometimes abbreviated as “pressure welding apparatus”) 100 includes a first tubular body (hereinafter referred to as “drill pipe body”) 1 and a second tubular body (hereinafter referred to as “drilling pipe body”). The first tube gripping means 10, the second tube rotation pressing means 20, and the inner surface burr cutting means 40 are arranged in a straight line. The outer surface burr cutting means 30 is installed alongside the two-pipe rotation pressing means 20.

(First tube gripping means)
The first tubular body gripping means 10 has a first chuck 11 that grips the drill pipe body 1 and a first turning roll 12 that rotatably supports the drill pipe body 1.
The first chuck 11 is a known air chuck, but its structure is not limited, and the drill pipe body 1 is gripped in a non-rotatable and non-movable (non-sliding) manner at a predetermined timing, and at a predetermined timing. As long as the grip of the drill pipe body 1 is released.
The first turning roll 12 has a function as a transport roll that supports the drill pipe body 1 so as to be rotatable around the pipe axis and moves in the pipe axis direction. However, the present invention is limited to this. The first turning roll 12 may be specialized in that the drill pipe main body 1 is rotatably supported around the pipe axis by separately installing a transport roll.

(Second tube rotation pressing means)
The second tube rotation pressing means 20 includes a second chuck 21 that holds the tool joint 2, a pressing mechanism 22 that moves the second chuck 21 back and forth in the tube axis direction, and a rotation mechanism that rotates the pressing mechanism 22 around the tube axis. 23.
The second chuck 21 is a known air chuck, but the structure thereof is not limited, and the tool joint 2 is gripped in a non-rotatable and non-movable (non-slip) manner at a predetermined timing, and at a predetermined timing. Any device that releases the grip of the tool joint 2 may be used. Further, in order to match the axis of the tool joint 2 gripped by the second chuck 21 with the axis of the drill pipe body 1 gripped by the first chuck 11 of the first tube gripping means 10, the second chuck 21 or One of the first chucks 11 is provided with a mechanism (not shown) for aligning the axes.

(External burr cutting means)
The outer surface burr cutting means 30 includes an outer surface burr cutting blade 31 and an outer surface burr cutting blade advance / retreat mechanism 32 that advances and retracts the outer surface burr cutting blade 31 toward the outer surface of the tool joint 2.
The outer surface burr cutting blade advance / retreat mechanism 32 has a tool post for fixing the outer surface burr cutting blade 31, a guide mechanism for guiding the tool post in a translational manner, a screw connected to the tool post, and rotationally driving the screw. Although it is a screw mechanism which comprises a motor (both not shown), it is not limited to this.

(Internal burr cutting means)
The inner surface burr cutting means 40 includes an inner surface burr cutting blade 41, an inner surface burr cutting blade installation bar 42 that fixes the inner surface burr cutting blade 41, a pinch roll 43 that holds and moves the inner surface burr cutting blade installation bar 42, and an inner surface It has a blade installation bar chuck 44 that holds the burr cutting blade installation bar 42, and a blade installation bar chuck moving means 45 that moves the blade installation bar chuck 44 back and forth in the axial direction.
That is, it has a pinch roll drive mechanism that includes an advance / retreat mechanism (not shown) for moving the pinch roll 43 toward and away from the blade installation bar and a motor (not shown) that rotationally drives the pinch roll 43.
Further, the blade setting bar chuck 44 is a mechanism that grips the inner surface burr cutting blade setting bar 42 so that it cannot rotate and translate (so as not to slip), and can freely open the grip, and its structure is limited. is not.
The blade setting bar chuck moving means 45 includes a guide mechanism that guides the blade setting bar chuck 44 in a translational manner, a screw that is screwed to the blade setting bar chuck 44, and a motor that rotationally drives the screw (not shown). However, the present invention is not limited to this, and any screw mechanism may be used as long as it can advance and retract at a very low speed necessary for the cutting operation described later and can support the cutting reaction force.

[Embodiment 2]
2 and 3 are side views schematically showing a rotational friction welding method according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted. Also, in the figure, the description of some components is omitted, the right side is referred to as “front”, and the left side is referred to as “rear”. In the figure, movement to the right is “forward” and movement to the left is referred to. This will be described as “retreat”.
In the initial step of the pressure welding operation, the drill pipe body 1 is gripped by the first chuck 11 of the first tube gripping means 10, and the tool joint 2 is gripped by the second chuck 21 of the second tube rotation pressing means 20. ing. At this time, the axis of the drill pipe body 1 and the axis of the tool joint 2 coincide with each other, and one end surface (hereinafter referred to as “rear end surface”) 1a of the drill pipe body 1 and one of the tool joint 2 It faces the end face (hereinafter referred to as “front end face”) 1b with a predetermined interval (see FIG. 1).

In FIG. 2A, while rotating the tool joint 2, the front end surface 2b of the tool joint 2 is pressed against the rear end surface 1a of the drill pipe main body 1 to press the two. Such work is the same as the known pressure welding work.
However, in the present invention, the inner surface burr cutting blade 41 is inserted into the drill pipe body 1 prior to or in parallel with the pressure welding operation. That is, the inner surface burr cutting blade installation bar 42 is inserted from the front end surface 1b side of the drill pipe body 1 by the rotation of the pinch roll 43 while being held by the pinch roll 43, and the inner surface burr cutting blade 41 is pressed against the pressure contact portion (drill pipe). The main body 1 is retracted to the vicinity of the rear end face 1a) (for example, a position 20 mm away from the press contact portion). At this time, the blade setting bar chuck 44 does not hold the inner surface burr cutting blade setting bar 42.
Therefore, since the inner surface burr cutting blade 41 is inserted into the drill pipe main body 1 in a non-rotating state, the inner surface is not cut carelessly, and the support mechanism (centering mechanism or drill) of the inner surface burr cutting blade 41 is prevented. The sliding mechanism with the inner surface of the pipe body 1 is simplified.

In FIG. 2B, when the pressure welding operation is completed, the first chuck 11 of the first tube gripping means 10 releases the grip of the drill pipe body 1. Therefore, in the second tube rotation pressing means 20, the pressing mechanism 22 moves backward while the second chuck 21 holds the tool joint 2, and the phase of the joint 3 between the drill pipe body 1 and the tool joint 2. However, it stops at a position corresponding to the phase of the outer surface burr cutting blade 31. The first turning roll 12 may be rotationally driven or rotated freely in synchronization with the backward movement.
At this time, the pinch roll 43 of the inner surface burr cutting means 40 releases the grip of the inner surface burr cutting blade installation bar 42, and instead of this, the blade installation bar chuck 44 holds the inner surface burr cutting blade installation bar 42. . Then, in accordance with the retreat of the pressing mechanism 22 (same as the retreat of the position of the joint portion 3), the blade setting bar chuck moving means 45 retreats, and the inner surface burr cutting blade 41 is positioned at a close distance of the joint portion 3. .

In FIG. 2C, the second chuck 21 holding the tool joint 2 rotates. At this time, the outer surface burr cutting blade advance / retreat mechanism 32 advances the outer surface burr cutting blade 31 toward the joint portion 3, thereby cutting the outer surface burr. At the same time, the blade setting bar chuck moving means 45 retracts the inner surface burr cutting blade 41 toward the joint portion 3, whereby the inner surface burr is cut.
That is, since the outer surface burr and the inner surface burr are cut in a soft state immediately after the pressure welding operation and before being hardened by air cooling, the cutting time is shortened and the outer surface burr cutting blade 31 and the inner surface burr cutting blade 41 are cut. Extends tool life. Therefore, the production efficiency is improved and the tool basic unit is improved.

Further, since the outer burr and the inner burr are cut by the rotation of the second chuck 21, it is not necessary to turn both the outer burr cutting blade 31 and the inner burr cutting blade 41, the increase in the number of parts can be suppressed, and the structure is simple. become. Therefore, an increase in manufacturing cost and maintenance cost of the pressure welding apparatus 100 is suppressed, and the reliability of the pressure welding apparatus 100 is improved.
Note that when the inner surface burr cutting tool 41 is moved backward toward the joint portion 3, oscillation in which forward movement is mixed may be performed, or the speed of backward movement or forward movement may be changed.

In FIG. 3, after the cutting of the outer surface burr and the inner surface burr is completed, the outer surface burr cutting blade 31 is separated from the joint portion 3. Further, the cutter setting bar chuck 44 releases the gripping of the inner surface burr cutting tool setting bar 42, and instead, the pinch roll 43 grips the inner surface burr cutting tool setting bar 42 and advances the inner surface burr cutting tool setting bar 42. Therefore, the inner surface burr cutting blade 41 is extracted from the drill pipe body 1.
Furthermore, the second chuck 21 of the second tube rotation pressing means 20 releases the grip of the tool joint 2 (the drill pipe body 1 is joined), and the blade setting bar chuck 44 of the inner surface burr cutting means 40 is used for the inner surface burr. The gripping of the cutting blade installation bar 42 is released. At this time, since the first chuck 11 of the first tube gripping means 10 has already opened the grip of the drill pipe body 1 (the tool joint 2 is joined), the drill pipe body 1 and the tool joint 2 The joined body is supported by the first turning roll 12 of the first tube gripping means 10.

Therefore, the first turning roll 12 is rotationally driven to advance the joined body of the drill pipe main body 1 and the tool joint 2, and is stopped at a position where it can be conveyed in the front or back direction or the upward direction in the drawing. .
The inner surface burr cutting blade 41 is extracted from the drill pipe body 1 (the same as the advance of the inner surface burr cutting blade installation bar 42 by the pinch roll 43), and the joined body of the drill pipe body 1 and the tool joint 2 is advanced (first). 1 turning roll 12 may be driven substantially simultaneously in parallel.

  The present invention has a simple configuration and can cut the inner surface burr while minimizing the restriction on the inner surface shape of the workpiece. Therefore, the present invention is not limited to the steel pipe body and is made of various materials. It can be widely used as a rotary friction welding method and a rotary friction welding apparatus for hollow bodies.

The side view which shows typically the rotational friction welding apparatus which concerns on Embodiment 1 of this invention. The side view which shows typically the rotational friction welding method which concerns on Embodiment 2 of this invention. The side view which shows typically the rotational friction welding method which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drill pipe main body 2 Tool joint 3 Joint part 10 1st pipe body holding means 11 1st chuck 12 1st turning roll 20 2nd pipe body rotation press means 21 2nd chuck 22 Pressing mechanism 23 Rotating mechanism 30 Outer surface burr cutting means 31 Outer surface burr cutting tool 32 Outer surface burr cutting blade advance / retreat mechanism 40 Inner surface burr cutting means 41 Inner surface burr cutting blade 42 Inner surface burr cutting blade installation bar 43 Pinch roll 44 Cutter installation bar chuck 45 Cutter installation bar chuck moving unit 100 Pressure welding device

Claims (8)

A rotating friction welding method for a tubular body, wherein the second tubular body is pressed and joined to the first tubular body while rotating,
Arranging the first tubular body and the second tubular body coaxially with their end faces facing each other;
Inserting an internal burr cutting tool from an end far from the second tube near an end near the second tube inside the first tube;
While rotating the second tubular body, pressing the second tubular body against the first tubular body and holding them together,
While moving the first tubular body and the second tubular body in a joined state, moving the inner surface burr cutting blade to the joint portion between the first tubular body and the second tubular body, Cutting internal burrs formed at the joint,
A method for rotating friction welding of a tubular body.   The rotational friction of the tubular body according to claim 1, wherein the step of inserting the inner surface burr cutting blade and the step of joining the first tubular body and the second tubular body are performed in parallel. Pressure welding method. Preliminarily disposing an outer surface burr cutting blade facing the side surface of the second tubular body;
By moving the outer surface burr cutting blade to the joint portion of the first tube body and the second tube body while rotating the first tube body and the second tube body in the joined state, Cutting the outer surface burr formed at the joint;
The method of rotating friction welding of a tubular body according to claim 1 or 2, wherein:   The method of rotating friction welding the tubular body according to claim 3, wherein the step of cutting the inner surface burr and the step of cutting the outer surface burr are performed in parallel. First tube gripping means for gripping the first tube in a non-rotatable manner;
The first tubular body gripped by the first tubular body gripping means is opposed to the end surface, and the second tubular body is gripped and rotated coaxially with the first tubular body, and the end surface of the second tubular body Second tube rotation pressing means that presses against the end surface of the first tube,
An inner surface burr cutting means for inserting an inner surface burr cutting blade into the first tube body from an end surface far from the second tube body,
While rotating the second tubular body, the second tubular body is pressed against the first tubular body in a gripped state and joined together, and then the first tubular body and the second tubular body in the joined state Control means for cutting the inner surface burr formed on the joint by moving the inner surface burr cutting blade to the joint between the first tube and the second tube while rotating the body;
A rotary friction welding device for a tubular body.   The controller, while rotating the second tube body, presses the inner tube burr cutting blade in advance before pressing the second tube body against the first tube body and joining them together. The rotary friction welding apparatus for a tubular body according to claim 5, wherein the rotational friction welding apparatus for a tubular body is arranged near an end surface close to the second tubular body inside the first tubular body. The inner surface burr cutting means includes a blade setting bar on which the inner surface burr cutting blade is set, a pinch roll driving mechanism that holds the blade setting bar and moves it forward and backward, and holds the blade setting bar and moves it back and forth. A screw drive mechanism
The rotating friction welding apparatus for a tubular body according to claim 5 or 6, wherein a speed at which the pinch roll drive mechanism advances and retreats is higher than a speed at which the screw drive mechanism advances and retreats. An outer surface burr cutting means for moving an outer surface burr cutting blade forward and backward toward the side surface of the second tube body, which is arranged side by side with the second tube body rotation pressing means;
The control means presses the second tubular body while pressing the second tubular body while rotating the second tubular body, joins the two, and then joins the first tubular body. The outer surface burr formed on the joint is cut by moving the outer surface burr cutting blade to the joint between the first tube and the second tube while rotating the first tube and the second tube. The rotary friction welding apparatus for a tubular body according to any one of claims 5 to 7, wherein:

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