JPH0775885A - Friction welding machine for long tube - Google Patents

Abstract

PURPOSE:To provide a friction welding machine which can execute the friction welding of long tubes as works, and can execute the deburring without taking out the works following the friction welding process. CONSTITUTION:A friction welding machine 1 consists of a cylindrical body where a main spindle passes through a working body 18 in the advancing/ retracting direction. In addition, the friction welding machine 10 is provided with a cutting shaft which penetrates the hollow part of the main shaft in the longitudinal direction, and has an inner burr cutting blade on the front end part, a second driving device 22 and a third holding device 24. The second driving device is connected to the working body on the opposite side to the first holding device, and can be advanced/retracted in an integrated manner, and holds the other end of the cutting shaft and advances/retracts the cutting shaft in the longitudinal direction of the main shaft, and rotates it around the axis of the main shaft. The third holding device is connected to the working body between the working body 18 and the second driving device, and advances/ retracts in an integrated manner, and rotatably holds the work. This constitution allows the friction welding of long tubes as the works, and the subsequent cutting of burrs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction welding machine for long pipes, and more specifically, one of a pair of workpieces to be pressure-contacted (workpiece A) is fixed and the other (workpiece B) is fixed. A friction welding machine for a peripheral joint of a tubular workpiece, which is brought into contact with the workpiece A under pressure while rotating, and has a length capable of performing friction welding even if the workpiece B is a long pipe. The present invention relates to a friction welding machine for a scale.

[0002]

2. Description of the Related Art A friction welding machine is generally disclosed in JP-A-1-12.
As disclosed in Japanese Patent Publication No. 7202, it includes a base, a first gripping device fixed on the base, and an actuating member that moves forward and backward with respect to the first gripping device on the base. Further, the actuation body includes a drive device, a main shaft that is integrally advanced and retracted with the actuation body, and is rotated by the drive device around an advance / retreat direction line of the actuation body, and an outer burr cutting that rotates together with the main shaft. And a device. The spindle holds the workpiece B inside and holds the workpiece B by providing a second gripping device at the end portion of the spindle on the first gripping device side. Conventionally, the combination of workpieces that can be frictionally welded in a friction welding machine with an internal burr cutting device that has been practically used is a combination of a long pipe and a short pipe, or a long pipe and, for example, a flange, a different diameter joint, a branch pipe, or the like. Only the combination with short piping material, the combination of long pipe and long pipe,
The friction welding could not be done. This is because only the short pipe or the short pipe material having a short length can be accommodated in the main shaft on the rotating side and grasped by the second grasping device because of its structure and function.

Further, friction welding machines have been proposed in which a long tubular workpiece is housed on the rotating side and held, but they have been put to practical use to such an extent that friction welding can be carried out industrially. In addition, in order to remove the burr generated by friction welding, it was necessary to remove the work piece from the friction welding machine and remove it with another deburring device.

[0004]

By the way, a chemical device,
A process device such as an oil refining device is formed by connecting a large number of devices with pipes. Such piping is 1
It is necessary to expand not only in two dimensions but also in two and three dimensions, branching in various ways, bending in places, and having a connection port with equipment, so in piping work, pipes and flanges, elbows, branch pipes It is necessary to connect piping components such as joints with different diameters, or to connect a long pipe to a long pipe. Further, there are cases where it is necessary to connect a pipe to a pipe having a piping component such as an elbow attached at one end, and in some cases, it becomes necessary to connect a long pipe to the piping component with such a piping component. . However, the conventional friction welding machine does not allow the long pipe to be accommodated and held on the rotating side, so use the friction welding machine when the above-mentioned piping work is required. However, the use of friction welding machines was extremely limited. Even if a long pipe can be gripped on the rotating side, it is necessary to remove the workpiece from the friction welding machine after friction welding with the conventional friction welding machine and cut the burr with another cutting device. Because of this, the work efficiency was extremely poor.

By the way, the peripheral joint welding of pipes requires a high level of skill and experience in the pre-welding preparation for welding the groove ends and performing the groove processing and the welding construction itself. It becomes increasingly difficult to arrange a large number of skilled workers with experience, which hinders smooth piping work. Therefore, the advent of a friction welding machine which can accommodate and hold a long pipe on the rotating side and has a wide range of pressure welding and which can be industrially used has been desired.

In view of the above situation, the present invention is to provide a friction welding machine which can frictionally weld long tubes to each other and can perform deburring without having to remove the workpiece after the welding step. .

[0007]

In order to frictionally weld the long tubes to each other, firstly, an appropriate means for accommodating and holding the long tubes on the rotating side, and secondly, the long tubes are rotated. However, a means for effectively stopping the lateral runout, a third means for aligning the cutting shaft penetrating the long pipe to prevent the lateral runout, and a fourth inner burr cutting blade It was necessary to develop a means to prevent the inner surface of the long tube from being damaged. The inventor of the present invention completed the present invention by actually producing an experimental machine and conducting a number of experiments to study friction welding, and then developed each of the above means.

In order to achieve the above object, based on the results of experiments, in the friction welding machine according to the present invention, the main shaft is composed of a cylindrical body which penetrates the operating body in the advancing and retreating direction, and further, the hollow portion of the main shaft is set in the longitudinal direction. A cutting shaft that penetrates and extends through and has an inner burr cutting blade at the end of the second gripping device side, and is connected to the actuation body on the side opposite to the first gripping device to integrally advance and retreat and A second driving device that holds the other end to move the cutting shaft forward and backward in the longitudinal direction of the spindle and rotate around the spindle axis, and is connected to the operating body between the operating body and the second driving device. And a third gripping device that rotatably grips the work piece while moving forward and backward integrally, wherein the tubular work piece B is a long pipe, and the long pipe is provided between the main shaft and the cutting shaft. In the annular space, and one end of the long tube is a second gripping device and the other end is It is characterized in three gripping device that was to grip respectively.

The actuating body is formed of a rigid structure and is driven by a suitable driving device. For example, a shaft extending from a hydraulic cylinder or a pneumatic cylinder fixed on a base is fixed to an actuating body, and the actuating body moves forward and backward relative to the first gripping device on the base due to expansion and contraction of the shaft so that the workpieces can be machined to each other. Pressure contact. A large pressure is required when the work piece is pressed against a large diameter or thick tube, and a small pressure is required when the work piece is pressed against a small diameter or thin tube. It is desirable that the drive unit to be moved forward be composed of two types of drive units, that is, high thrust and low thrust. The cross-sectional shape of the cutting shaft is not particularly limited, but is preferably circular in order to improve the balance during rotation. The member that connects the second drive device to the actuation body is not particularly limited, and for example, the second drive device and the actuation body are connected by two rods that extend in parallel to the left and right around the cutting shaft.

Practically, the third length is adjusted according to the length of the long pipe.
It would be desirable to be able to easily adjust the position of the gripping device. Therefore, as in the case of the embodiment described later, by cutting a spiral screw on these two rods, the third gripping device is movable along the screw, and by locking with a nut, The two grippers integrally connect the third gripping device to the actuation body. The cutting shaft is connected to a plunger that moves forward and backward in a hydraulic cylinder provided in the second drive device, and moves forward and backward in the longitudinal direction of the main shaft as the plunger moves forward and backward. Further, as described in the embodiment, a thrust bearing and a journal bearing are attached to the plunger connected to the cutting shaft so that the thrust bearing functions in the forward / backward direction and the journal bearing functions in the rotation. Is desirable. The cutting shaft rotating means provided in the second drive device is not particularly limited, and for example, an electric motor can be used.

In a preferred embodiment of the present invention, a cutting shaft has a cutting shaft body, a cutting shaft body housed in a hollow portion, and a ring-shaped low friction oilless bush interposed between the cutting shaft body and the cutting shaft body. A cutting shaft body is provided with an inner burr cutting blade at an end on the second gripping device side, and the other end is an outer pipe for accommodating the inner pipe in a hollow portion. Is driven by a second drive device that grips to move the inner burr cutting blade forwards and backwards in the longitudinal direction of the spindle to move the inner burr cutting blade in and out through the spindle opening, and the outer tube has a front end portion of the inner burr cutting blade of the cutting shaft body. It is provided with an inner peripheral surface located behind and formed in a tapered surface whose diameter decreases toward the inner burr cutting blade, and a plurality of slits formed so as to extend to the tip in the longitudinal direction of the spindle. , Further rear end is first The middle tube is fixed to the drive device, and the front end portion of the middle tube is located at the front end portion of the outer tube or behind the outer tube and has an outer peripheral surface formed into a tapered surface that matches the inner peripheral surface of the front end portion of the outer tube, Furthermore, the rear end portion is attached to the second drive device so that it can be freely moved back and forth in the longitudinal direction of the main shaft by being driven by the second drive device.

The cross-sectional shapes of the outer pipe and the middle pipe are not particularly limited, but it is desirable that they are similar to the cross-sectional shape of the cutting shaft main body in view of the structure of the combination, and when the cutting shaft main body is a round bar. A circular pipe is suitable for both the outer pipe and the middle pipe. The front ends of the outer tube and the middle tube may be the same as the outer tube body or the middle tube body, or may be separate bodies as in the embodiment.

In another preferred embodiment of the present invention, the inner burr cutting blade is composed of a plurality of bite tips held by a cylindrical holder attached to the end of the cutting shaft on the side of the second gripping device. On the outer periphery of the holder, a rotatable ring-shaped roller having an outer diameter larger than the outer diameter of the holder and smaller than the inner diameter of the workpiece B is provided concentrically with the holder.
At least one of the plurality of bite tips (one bite tip) has a diameter position slightly larger than the outer diameter of the roller, and the remaining bite tips are slightly inward of the outer diameter. The cutting shaft is arranged so that one bite tip is positioned on the upper side and the remaining bite tips are positioned on the lower side in the peripheral position of the holder end face at the entered radial position in the mutually opposite directions with respect to the center of the holder. The rotation phase of the cutting shaft is maintained while the rotation of the cutting shaft is stopped.

Further, in a more preferable embodiment thereof, the cylindrical holder is a bite having an elastic means for pushing down the cutting shaft by pushing the inner peripheral surface of the workpiece B against the holder. It is provided at the same circumferential position as the tip, and while the workpiece B is being rotated and brought into contact with the workpiece A under pressure, the cutting shaft is pushed downward to move one bite tip to the inner periphery of the workpiece B. The feature is that it does not touch the surface.

According to another preferred embodiment of the present invention, the outlet through which the cutting shaft assembly penetrates the operating body on the side opposite to the second gripping device is provided with a work piece B inserted outside the cutting shaft assembly. It is characterized in that an aligning device for holding the workpiece B to prevent the workpiece B from swaying is provided. One preferable embodiment of the aligning device is provided with a pressing roller that rotates around an axis parallel to the longitudinal direction of the cutting shaft assembly at one end, and each of the pressing rollers rotates around a fulcrum symmetrically arranged with respect to the cutting shaft axis. It is characterized by comprising at least three levers that rotate, a link mechanism that moves the other end of the lever so that the pressing roller presses the workpiece B, and a fluid pressure cylinder that drives the link mechanism.

In another preferred embodiment of the present invention, the inner diameter is larger than the outer diameter of the work piece B and the outer diameter is smaller than the inner diameter of the main shaft. -The present invention is characterized in that a sleeve equipped with a ring and slidable with respect to the main shaft is provided in the main shaft, and the workpiece B is inserted into the sleeve. The sleeve can be replaced according to the outer diameter of the workpiece B. For the O-ring, for example, a commercially available Teflon O-ring can be used.

A preferred embodiment of the method for joining the peripheral joints of the tubular work pieces using the friction welding machine according to the present invention is to use one of the work pieces (workpiece A ) Is fixed and the other (workpiece B) is brought into contact with the workpiece A under pressure while rotating, and when the peripheral joint joining of the tubular work piece is performed, the main shaft is rotated and By moving the workpiece B held and held in the main shaft while rotating, the workpiece B is brought into contact with the workpiece A under pressure, and the inner burr cutting blade is attached to the workpiece during the pressure welding step of joining the two. The cutting shaft was rotated in a rotation direction opposite to the rotation direction of the main shaft while being positioned in the vicinity of the joining portion between A and B, and thus was formed in a pressure welding process including a heating process and an upsetting process. The feature is that the inner burr is cut immediately. There.

Here, the heating step is a step of fixing the workpiece A and bringing the workpiece B into contact with and rotating the workpiece A to heat the workpiece A, and the upsetting step is the step of heating the workpiece B. In this step, the rotation is stopped and the workpiece A is pressed and pressed. For the inner burr cutting blade, a high heat resistant inner burr cutting blade, for example, a bite tip made of ceramics, cermet, or cemented carbide is used.

[0019]

According to the first aspect of the invention, the long tube is housed in the annular space between the main shaft and the cutting shaft, which are formed of a cylindrical body,
By gripping the front and rear ends of the long pipe by the second gripping device provided in the main shaft and the third gripping device that moves back and forth integrally with the actuating body and grips the workpiece rotatably, The long tube is accommodated and held so that friction welding can be performed. In addition, by providing an inner burr cutting blade at the tip of the cutting shaft that can move forward and backward, and adjusting the forward and backward movement of the cutting shaft so that the position of the inner burr cutting blade matches the position of the inner burr, after pressing the long tubes together , Internal burrs can be cut without removing from the friction welding machine.

According to the second aspect of the present invention, the cutting shaft is configured as a combination of the cutting shaft body, the outer pipe outside the cutting shaft body, and the outer pipe outside the cutting shaft body, and the second drive unit is provided through the rear end portion of the middle pipe. By advancing and retracting the middle pipe, the front end of the middle pipe freely enters the eye end portion of the outer pipe, and the outer peripheral taper surface of the middle pipe is engaged with the inner peripheral taper surface of the outer pipe front end portion. The tip of the pipe is expanded to press the inner peripheral surface of the workpiece. As a result, the cutting shaft body can be automatically aligned with the axial center of the long tube and held at that position, and the rigidity of the cutting shaft body is increased.

According to the third aspect of the invention, at least one of the plurality of bite chips (one bite chip) has a diameter position slightly larger than the outer diameter of the roller, and the remaining bite chips are slightly smaller than the outer diameter. The cutting shaft is placed so that one bite tip is on the upper side and the rest is on the lower side at the inward radial position on the peripheral edge of the holder end surface in the opposite direction to the center of the holder. Since the rotation phase is maintained while the rotation is stopped, even if the holder comes into contact with the inner surface of the workpiece by its own weight, the bite tip does not come into contact with the inner surface of the workpiece. As a result, even if the bite tip is moved back and forth, or even if the work piece is pulled out from the spindle after the inner burr is cut, the inner surface of the work piece is not damaged by the bite tip. Further, at the time of internal burr cutting, the remaining bite tip is roughly cut and the one bite tip is finish-cut.

In a fourth aspect of the present invention, in the cylindrical holder, the elastic means for pushing down the cutting shaft by pushing the inner peripheral surface of the workpiece B against the holder is one bite tip. By equipping the same circumferential position, the cutting shaft is pushed down during the pressure welding process in which the workpiece B is brought into contact with the workpiece A under pressure while rotating, and one bite tip is placed on the inner periphery of the workpiece B. The inner peripheral surface of the workpiece B is prevented from being damaged so as not to contact the surface. When performing inner burr cutting, if the middle tube is advanced,
Due to the cooperation of the front end of the middle pipe and the front end of the outer pipe, the cutting shaft body, that is, the inner burr cutting blade with the bite tip attached, is positioned at the axis of the workpiece B, and one bite tip is just the workpiece. Located on the inner peripheral surface of B.

According to the fifth and sixth aspects of the invention, the centering device prevents lateral runout during rotation of the long tube, and a smooth friction welding operation can be realized. Further, when the workpiece B is inserted into the spindle, the cutting shaft is held on the axis of the spindle to ensure a uniform gap between the workpiece and the second gripping device in the circumferential direction. Functions to facilitate insertion into the inside. In the invention of claim 7, when there is a large difference between the inner diameter of the spindle and the outer diameter of the long tube, the work piece B is inserted horizontally into the spindle by keeping the core in the spindle center by mounting the sleeve. In addition, it is possible to easily prevent the horizontal pipe from swinging while rotating.

According to the invention of claim 8, the inner burr cutting blade is located near the joining portion from the beginning, and the cutting shaft is rotated in the rotation direction opposite to the rotation direction of the main shaft, so that the inner burr is immediately formed. Internal burr can be cut.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail based on embodiments with reference to the accompanying drawings. 1 is a plan view of an embodiment of a friction welding machine according to the present invention, FIG. 2 is a side view of the friction welding machine of FIG. 1, and FIG. 3 is a longitudinal sectional view of a spindle. Each drawing is a schematic drawing.

The friction welding machine 10 according to the present invention, as shown in FIGS. 1 and 2, has a base 12 and a first gripping device fixed on one end (front end) 14 of the base 12. 16, an operating body 18 that advances on the base 12 toward the first gripping device 16 and then retracts, and an operating body 18 located on the side of the end (rear end) 20 opposite to the front end. A second drive device 22 that is connected and is capable of integrally advancing and retreating, and a third gripping device 24 that is located between the operating body 18 and the second drive device 22 and that is connected to the operating body 18 and that is integrally advancing and retracting. It is basically composed of In the illustrated example, the pair of tubular work pieces A and B to be pressed are both long pipes, one pipe A being clamped by the first gripping device 16, and the other pipe. B penetrates the actuation body 18 and one end thereof is clamped by the third gripping device 24. The pipe A does not necessarily have to be a straight pipe, and may be, for example, a pipe in which an elbow is connected to the end portion, or the pipe B may be connected to an elbow having an elbow.

The base 12 has a rectangular plane and a rear end portion 20.
(The front end portion 14 side is hereinafter referred to as the front portion or the front portion, and the rear end portion 20 side is referred to as the rear portion or the rear portion.) This is a rigid structure that is formed in a higher shape and is fixed on the floor of the factory. First
The gripping device 16 includes a drive device 26A such as a hydraulic cylinder,
28A, B of a pair of clamp pawls each having B respectively
Is provided on the left and right, and the clamp claws 28A and 28B are connected to the drive unit 26
The pipe A is clamped by being operated by A and B.
The present inventors have already researched various configurations of the gripping device and put them into practical use, for example, Japanese Patent Publication No. 1-53.
Although disclosed in Japanese Patent Publication No. 160, etc., the gripping device proposed in Japanese Patent Application No. 4-001738 is used in this embodiment. This gripping device is improved so that the stationary side workpiece A and the rotating side workpiece B can be easily aligned.

The actuating member 18 is a rectangular rigid structure, and has an electric motor 30 as a first driving device for rotating a main shaft, which will be described later, on its upper surface and a second gripping device 32 on its front surface. The bottom surface slides on the base 12 in the longitudinal direction of the base 12 and moves back and forth with respect to the first gripping device 16. Actuator 18
The forward / backward movement of the drive device is fixed to the support members 34A and 34B that are integrally formed with the base 12 and stand upright on the left and right of the base 12,
For example, the driving force of a hydraulic cylinder is used. The hydraulic cylinder is composed of a set of a high-thrust hydraulic cylinder 36 and a low-thrust hydraulic cylinder 38, and the sets A and B are attached to the support members 34A and B, respectively.
The tip ends of the shafts 40A and 40B are fixed to the operating body 18.

The main shaft 42, as shown in FIG.
It is formed of a cylindrical body penetrating 8 and extending in the advancing / retreating direction thereof, and moves forward / backward integrally with the operating body, and at the same time, the electric motor 3
0 rotates about the axis of the cylindrical body via the gear mechanism. A second gripping device 32 is provided on the end surface of the cylindrical main shaft 42. Incidentally, 18 in FIG.
Shows a cross section of a part of the casing of the actuation body 18. The first journal bearing 44 is located behind the second gripping device 32, and the second journal bearing 46 is located near the main spindle rear end so that the main shaft 42 freely rotates around the main shaft axis with respect to the actuating body 18. It is provided. A thrust bearing 48 is provided between the first and second journal bearings 44 and 46 so as to receive thrust during frictional rotation and pressure contact.

A gear 50 having teeth engraved on its outer circumference is attached to the main shaft 42 between a thrust bearing 48 and a journal bearing 46, and a gear mechanism 52, a part of which is shown in FIG. The rotary force of the electric motor 30 is received therethrough, whereby the main shaft 42 rotates. The gear mechanism 52 is composed of a low speed gear mechanism having a large rotation ratio (for example, 2: 1) used during outer flash cutting and a high speed gear mechanism having a small rotation ratio (for example, 1: 1) used during friction heating, Each can be switched by a clutch mechanism (not shown).

The second gripping device 32 has already been studied by the present inventors and various devices have been put to practical use.
They are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 4-41086 and 4-52089, and Japanese Patent Application No. 4-00.
1781 proposed. The gripping device used in this embodiment is substantially the same as the collet chuck type gripping device proposed in Japanese Patent Application No. 4-001781. As shown in FIG. 3, the second gripping device 32 of the present embodiment is a combination of a collet chuck outer cylinder 54, a collet chuck 56, a first plunger 58, and a cylinder cover 60. Since the details of each component of the combination are described in the above-mentioned application specification, only the basic configuration related to the present invention will be described here.

The collet chuck outer cylinder 54 is a cylindrical member having an inner peripheral surface formed on a conical tapered surface 62 whose inner diameter increases toward the front, and which is the main shaft 42.
Is connected to the front end face of. The collet chuck 56 is also
Basically, it is a member formed in a cylindrical shape, the front part is a claw part 57 for gripping a workpiece, the rear part is a cylinder having a smaller diameter than the front part, and a screw is engraved on the cylindrical outer peripheral surface. The screw engaging portion 59 and the middle portion are formed as a cylindrical connecting portion that connects the front portion and the rear portion. The collet chuck 56 is fixed to the front portion of the first plunger 58 via a screw engaging portion 59. The claw portion 57 includes a plurality of slits, for example, eight slits, including the outer peripheral portion of the annular plate 61 of the cylindrical connecting portion.
The tip of the claw portion is cut in the longitudinal direction of 2, and the portions between the slits each function as a claw.
On the other hand, the outer peripheral surface of the claw portion 57 is formed as a tapered surface that matches the tapered surface 62 of the collet chuck outer cylinder 54. With the above configuration, when the collet chuck 56 retracts rearward, the diameter of the claw portion 57 is reduced so that the claw between the slits firmly and firmly holds the workpiece, and when the collet chuck 56 moves forward, the claw portion 57 is formed.
The diameter of the workpiece increases and the claw between the slits releases the workpiece from the gripped state.

The first plunger 58 is a cylindrical body,
The cylinder 63 formed between the main shaft 42 and the cylinder cover 60 is configured to move forward and backward, and has small annular chambers 64, 66 in front of and behind the plunger portion.
It moves forward and backward by the hydraulic pressure of the hydraulic oil flowing in and out of it. Since the collet chuck 56 is connected to the first plunger 58, when the first plunger 58 retracts, the collet chuck 56 retracts with respect to the collet chuck outer cylinder 54 and the claw portion 57 contracts, so that the first plunger 58 moves. When advanced, the collet chuck 56 advances with respect to the collet chuck outer cylinder 54, and the diameter of the claw portion 57 returns to its original value.

The collet chuck outer cylinder 54 is provided with an outer burr cutting device 68 for cutting the outer burr formed on the work piece pressure contact portion after the pressure contact. The inventors of the present invention have also studied outer burr cutting devices for many years, and have developed various types of outer burr cutting devices in JP-A-1-127202 and JP-A-3-2085.
Although disclosed in JP-A No. 03, etc., in this embodiment, the outer burr cutting device 68 disclosed in JP-A-208503 is used as the outer burr cutting device 68. Since the details of each component of the outer burr cutting device 68 are described in the above-mentioned publication, only the basic configuration related to the present invention will be described here. The outer burr cutting device 68 is provided with an arm that is supported in parallel with the main axis of the main shaft and is made to oscillate, and the bite tip 69 disposed at the tip thereof is brought into contact with the outer burr for cutting. The device is designed so that the arm can be fast-moved to a predetermined position and can be moved at a fine speed. The outer burr cutting device 68 rotates integrally with the main shaft 42 through the attached collet chuck outer cylinder 54, whereby the bite tip 69 cuts the outer burr.

FIG. 4 is a longitudinal partial cross-sectional view showing the structure of the cutting shaft assembly 71 existing in the hollow portion of the pipe B held by the collet chuck assembly 32 provided on the front portion of the main shaft 42. 5 is a partial cross-sectional view of the second drive device 22, and FIG. 6 is a partial cross-sectional view of the outer pipe front end portion. Figure 4
As shown in FIG. 4, the cutting shaft combination 71 includes a cutting shaft main body 72 that extends through the main shaft 42 to the second drive device 22, a middle pipe 74 and an outer pipe 76 that extend in the same manner, and a cutting shaft main body 72. It is composed of an inner burr cutting blade portion 78 at the front end. In the figure, reference numeral 70 denotes an adjusting collet chuck, which is used when the outer diameter of the workpiece is smaller than the diameter of the collet chuck 56, and has substantially the same configuration as the collet chuck 56.

The cutting shaft main body 72 is a solid round bar-shaped member having an inner burr cutting blade portion 78 at its front portion, and as shown in FIG. 5, at the rear end portion 120 by the second drive device 22. It is supported. The inner burr cutting blade portion 78 is attached to inner burr cutting blades 80A and B composed of two bite tips, a holding member 82 that holds the inner burr cutting blades 80A and B, and the front end of the cutting shaft body 72. Holding member 8
2 and a columnar holder 84 that accommodates 2.
The holder 84 is a cylindrical member having a hollow portion having the same inner diameter as the outer diameter of the cutting shaft main body 72, and is engaged with the cutting shaft main body 72 by an engaging means by a combination of a key groove and a key (not shown). The cutting shaft body 72 is rotated integrally with the cutting shaft body 72. On the outer circumference of the holder 84, a rotatable ring-shaped roller 86 having an outer diameter larger than the outer diameter of the holder 84 and slightly smaller than the inner diameter of the pipe B is provided concentrically with the holder 84. By interposing the holder 84, the holder 84 can freely rotate with respect to the pipe B and the cutting shaft 72 as the cutting shaft body 72 rotates.

The holding member 82 includes a disc portion 88 and a disc portion 8
8 and a rod portion 90 integrally formed with the rod portion 90 and extending in the longitudinal direction of the main axis from the center thereof. The rod portion 90 penetrates into the holder 84 and is screwed thereto. The two bite chips 80A and 80B are arranged on the tip surface of the disk portion 88 at the peripheral portions in directions opposite to each other with respect to the center thereof. The tip of one bite tip 80A has a diameter position slightly larger than the outer diameter of the roller 86 (for example, 1 mm larger), and the tip of the other bite tip 80B has a diameter slightly inside the outer diameter, for example, within 1 mm. It is attached to the disc portion 88 at a radial position inward. In the cutting shaft main body 72, the rotation thereof is stopped or the workpiece B is rotated so that the bite tip 80A is located on the upper side and the bite tip 80B is located on the lower side.
Since the rotation phase is maintained, the cutting shaft main body 72
When the pipe B is pulled out from the main shaft 42 during the forward / backward movement or after the internal burr cutting, the inner surface of the pipe B is not damaged by the bite tip 80. Further, at the time of internal burr cutting, the bite tip B is subjected to rough cutting, and the bite tip A is subjected to finish cutting.

In this embodiment, the bite chip retracting device 81 is provided behind the roller 86 at the rear of the holder 84, as shown in FIG.
It is provided as shown in. Bite chip retractor 81
Is the elastic force of an appropriate elastic means, for example, the elastic force of the leaf spring 83 shown in FIG. 9B or the coil spring 85 shown in FIG. 9C, and the inner peripheral surface of the pipe B through the sliding piece 87. The inner burr cutting blade portion 78 of the cutting shaft assembly 71 by pressing the
Push down. 9 (b) or 9 (b) corresponds to FIG.
It is sectional drawing of the arrow I-I of (a). This prevents the bite tip 80A from being damaged by the tip of one bite tip 80A coming into contact with the inner peripheral surface of the pipe B while the cutting shaft assembly 71 is stopped rotating. For internal burr cutting, the front end of the middle pipe (inner deburring inner collet) 1
When 06 is advanced, the collet is tightened and the cutting shaft (cutting shaft main body) 72, the inner burr cutting blade portion 78, and the cutting shaft assembly 71 are returned to the shaft center of the workpiece B, and the bite tip 80A moves to the pipe B. The inner burr is cut by contacting the inner peripheral surface of. Since the sliding piece 87 slides on the inner peripheral surface of the pipe B in the circumferential direction during rotation of the pipe B, it is made of a wear-resistant alloy or ceramics. Instead of the sliding piece 87, a roller that rolls on the inner peripheral surface of the pipe B may be used. In addition, FIG.
In (a) and (b), 89 is a holder for the leaf spring 83 or the coil spring 85.

The middle pipe 74 is a cylindrical body formed to accommodate the cutting shaft main body 72 in its hollow portion, and has a ring-shaped low friction oilless bush between the cutting shaft main body 72 and, for example, oil-impregnated sintered body. A metal bush 92 is interposed. Further, the outer pipe 76 is a cylindrical body formed to accommodate the middle pipe 74 in its hollow portion. At the front portion of the outer pipe 76, a cylindrical front end portion (inner deburring outer collet) 94
Are screwed together and arranged behind the holder 84.
As shown in FIG. 5, the rear end portion 96 of the outer tube 76 is fixed to the casing 100 of the second drive device 22 by screw connection via a mounting ring 98. As shown in FIG. 6, the front end portion 94 includes an inner peripheral surface formed on the tapered surface 102 whose diameter decreases toward the front, and a plurality of front end portions 94 extend to the tip in a direction parallel to the main shaft axis. Slit 10
4 are provided. In FIG. 6, reference numeral 105 denotes a screw connection portion with the outer tube 76.

A cylindrical front end portion 10 is provided on the front portion of the middle pipe 74.
6 are screwed together and arranged behind the front end 94 of the outer tube 76. As shown in FIG. 5, the rear end portion 108 of the middle pipe 74 is fixed to the front end portion of the second plunger 110 in the second drive device 22 by screw connection. Front end 106
Has a tapered surface formed on the outer circumference so as to match the tapered surface 102 on the inner circumference of the front end portion 94 of the outer tube 76,
A ring-shaped low-friction oilless bush, for example, a bush 112 made of oil-impregnated sintered metal is interposed between the front end portion 106 and the cutting shaft body 72. Second plunger 11
Reference numeral 0 denotes a cylindrical body, which is arranged in a hydraulic cylinder 114 formed in the casing 100 of the second drive device 22 and moves forward and backward by the hydraulic pressure acting on the annular small chambers 116 and 118 in front of and behind the second plunger 110. When the second plunger advances, the middle pipe 74 advances and its front end portion 106 enters the front end portion 94 of the outer pipe 76, and its tapered surface 102.
Engage with. As a result, the front end portion 94 of the outer pipe 76 is expanded to press the pipe B, and the cutting shaft main body 72 is automatically placed in a state in which the center line of the cutting shaft main body 72 and the center line of the pipe B coincide with each other. Align and hold in that position.

In front of the rear end portion 120 of the cutting shaft body 72, a third plunger 122 made of a cylindrical body is attached. The third plunger 122 is the second drive device 22.
Of the annular small chambers 126, which are arranged in the hydraulic cylinder 124 of the casing 100 of FIG.
The hydraulic pressure acting on 28 moves forward and backward. The cutting shaft main body 72 is moved by moving the third plunger 122 forward and backward.
Moves forward and backwards. As a result, the cutting shaft body 72
The inner burr cutting blade 78 at the tip of is advanced toward the inner burr,
Can be retracted after cutting. As the cutting shaft body 72 is rotatable with respect to the third plunger 122,
Two journal bearings 130A and 130B are attached to the front and rear portions of the third plunger 122, respectively. Further, in order to receive the thrust at the time of cutting the inner burr, the two thrust bearings 132A and 132B are respectively provided in the third plunger 1
Stoppers 134 attached to the front and rear of 22 and projecting annularly from the cutting shaft body 72 at the front.
And, in the rear part, it functions in cooperation with the annular stop plate 136 fixed to the casing 100.

Further, the rear end portion 12 of the cutting shaft body 72 is
0 is pivotally supported by a rotary bearing 140 fixed to a support (not shown) on the base 12, so that the cutting shaft main body 72 is pivotally supported by the second drive device 22 at the rear end 120. At its front end, it is supported by the inner surface of the pipe B via the roller 86 of the holder 84. Also pulley 1
38 is a cutting shaft main body 72 via a mounting plate 142.
It is fixed to. The cutting shaft body 72 is the pulley 1
It is rotated by an electric motor (not shown) mounted on the second drive device 22 via 38. As shown in FIG. 1, the second drive device 22 is connected to the actuation body 18 so as to integrally advance and retract with the actuation body 18 by two left and right connecting rods 144 </ b> A and B extending forward and backward on the base 12. There is. A spiral screw is engraved on the connecting rod 144 so that the relative connecting position of the third gripping device 24 described later can be adjusted.

The third gripping device 24 rotatably holds a conventional three-way chuck 146 (see FIG. 1) for gripping the end of the pipe B, and is connected to the actuating body 18 by a connecting rod 144. Also, it can be used as a stopper for the pipe B during the frictional contact and the pressure contact while advancing and retreating integrally with the second drive device 22 and for taking in and out the pipe before the pressure contact. The third gripping device 24 is hooked on the connecting rod 144 by fitting a nut (not shown) to the connecting rod 144 before and after the connecting rod penetrating portion of the third gripping device 24 and fastening the nut.

As shown in FIG. 1, the aligning device 150 is arranged outside the rear end of the main shaft 42 penetrating the operating body 18 and projects from the main shaft 42.
Is positioned so that it becomes the center. Figure 7
6 is a configuration diagram of the aligning device when the aligning device 150 is viewed from the back of the actuation body 18. FIG. The aligning device 150, as shown in FIG.
A hydraulic cylinder 152 fixed to the operating body 18 so as to freely rotate in a plane parallel to the back surface of the operating body 18,
It is composed of three sets of levers 154, 156, and 158 of different shapes connected to the hydraulic cylinder 152, and a link mechanism for moving the levers. First lever 1
Reference numeral 54 is a "" -shaped member that is located far from the hydraulic cylinder 152 and rotates around a fulcrum 160. The fulcrum 160 is located at a bending point of a V shape, and has a roller 162 attached to one end thereof, which rotates around an axis parallel to the axis of the main shaft 42, and has a first end at the other end. Arm 1
It is rotatably connected to one end of 64.

The second lever 156 is an "L" -shaped member which is located between the first lever 154 and the hydraulic cylinder 152 and which rotates around a fulcrum 166. Fulcrum 166
Is at a bending point of "L", a roller 168 similar to the roller 162 is attached to one end portion, and is rotatably connected to an intermediate point of the first arm 164 at the other end portion. ing. The third lever 158 is a “<”-shaped member that is located below the first lever 154 and the second lever 156 and that rotates around the fulcrum 170. The fulcrum 170 is "ku"
The roller 172, which is similar to the roller 162, is attached to one end of the second end at the second bending point.
It is rotatably connected to one end of the arm 174. Second
The other end of the arm 174 is rotatably connected to one end of an intermediate lever 178 that rotates around a fulcrum 176, and the other end of the first arm 164 rotates between the fulcrum 176 and the other end of the intermediate lever 178. It is movably connected. On the other hand, the other end of the intermediate lever 178 is connected to the shaft of the hydraulic cylinder 152.

Also, the rollers 162, 168 and 172.
Are arranged so as to press the outer periphery of the pipe B inserted outside the cutting shaft combination 71 at equal intervals. With the above-described configuration, the centering device 150 includes the hydraulic cylinder 1.
52 shaft expansion and contraction, intermediate lever 178, first
In cooperation with the linking operation of the arm 164 and the second arm 174, the rollers B, 168 and 172 press the pipe B arranged outside the cutting shaft combination 71 to prevent lateral shake. Further, the workpiece B is set to the spindle 42.
When the cutting shaft combination 71 is inserted into the inside, the cutting shaft combination 71 is kept at the main shaft axis to facilitate the insertion of the workpiece B. In FIG. 7, the dotted line indicates the position occupied by each member when the pipe B ′ has a small diameter.

When the difference between the inner diameter of the main shaft 42 and the outer diameter of the pipe B is large, the rotating pipe B may shake laterally in the main shaft 42. In such a case, the sleeve explained below is used. 42 from the middle to the rear end of the main shaft 4
It is installed in the annular space between 2 and the pipe B. Figure 8
FIG. 7 is a partial longitudinal cross-sectional view of the sleeve 180 for such a purpose. The sleeve 180 has a length slightly shorter than the length of the main shaft 42, an outer diameter smaller than the inner diameter of the main shaft 42, and an inner diameter of the pipe B.
The circular pipe 182 is slightly larger than the outer diameter of the circular pipe 182. An annular O- is provided on each of the front portion and the rear portion of the circular pipe 182.
The ring attachment portions 184 and 186 are integrally fixed. Two Teflon O-rings 188 are attached to the front O-ring mounting portion 184. The rear O-ring 186 also has two Teflon O-rings 1
90 are mounted at some distance. The outer diameters of the O-rings 186 and 190 are set to be substantially equal to the inner diameter of the main shaft 42.

The operation of the friction welding machine 10 will be briefly described below. The pipe B is inserted into the main shaft 42, the rear end of the pipe B is held by the third gripping device 24, and the front end thereof is held by the second gripping device 3.
Clamp by 2 respectively. At this time, the position of the third gripping device 24 is adjusted according to the length of the pipe B. Furthermore,
The pipe B is pressed and held by the rollers 160 and the like by operating the aligning device 150. Next, the pipe A is clamped by the first gripping device 16 while being aligned with the pipe B. Low thrust hydraulic cylinder 38 or high thrust hydraulic cylinder 36
Thus, the actuation body 18 is advanced to bring the pipe B into contact with the pipe A. Then, the electric motor 30 is driven to drive the main shaft 42.
The low thrust hydraulic cylinder 38 is operated while rotating the engine (rotation speed of about 250 to 1500 rpm) (pressure of about 10 to 20 kg).
f / cm ² ), which preheats pipe B and pipe A by friction. Next, the low thrust hydraulic cylinder 36 is operated (pressure is about 20 to 30 kgf / cm ² ) to frictionally heat the pipe A and the pipe B. The rotation of the main shaft 42 is stopped, and then the high thrust hydraulic cylinder 36 is operated (pressure of about 80
Approximately 120 kgf / cm ² ), and pipe A and pipe B are pressed together.

Next, the operation of the low-thrust hydraulic cylinder 36 is stopped, and the bite tip position of the outer burr cutting device 68 is adjusted with respect to the outer burr (the above is a case where the pipe diameter is relatively small, but a large diameter). On the other hand, it is operated with high thrust). Then, the rotation ratio of the gear mechanism is increased to rotate the electric motor 30, and the main shaft 42 is rotated at a low rotation speed (rotation speed is about 300 to 600 rpm, setting is changed depending on the pipe diameter).
The outer burr is cut by the outer burr cutting device 68 while rotating with. After the outer burr cutting, the electric motor 30 is stopped to stop the rotation of the main shaft 42, and then the second drive device 22 is operated. First, the cutting shaft body 72 is advanced to position the bite tip 80 of the inner burr cutting blade 78 at the position of the inner burr, and then the middle pipe 74 is advanced to move the cutting shaft body 7
Align the 2 and fix the position. Next, the cutting shaft main body 72 is rotated and the inner burr is cut by the inner burr cutting blade 78. After cutting, the two cutting tips 80A, B are brought into a rotation phase of the cutting shaft main body 72 that does not contact the pipes A, B, and the rotation of the cutting shaft main body 72 is stopped. Next, the middle pipe 74 is retracted, and the cutting shaft main body 7
2 is released and the engagement between the pipe B and the outer pipe 76 is released. Finally, the clamps of the first gripping device 16, the second gripping device 32, and the third gripping device 24 are released, and the continuous body of the pipe A and the pipe B that have been pressure-welded is removed from the friction welding machine 10.

When the inner burr is cut, the following method is preferable. That is, during the pressure welding step of joining the pipe A and the pipe B, while the inner burr cutting blade 78 is positioned in the vicinity of the joining portion between the workpiece A and the workpiece B, the rotation direction of the spindle 42 is opposite to the rotating direction. Cutting shaft body 7 in the direction of rotation
The 2 is rotated so that the formed inner burr is immediately cut in the pressure welding process including the heating process and the upsetting process. When performing such cutting, the inner deburring collet is utilized even during the pressure welding process, that is, the middle pipe 74
Must be advanced to fix the axial center of the cutting shaft main body 72. At this time, since the pipe and the collet rotate in the same direction at the same time, the thrust bearing should be inserted in the middle pipe and the outer pipe.

In the actual machine, the friction welding machine 10 is provided with a control device (not shown), and the operation steps and operation conditions described above are stored in the storage device of the control device in advance, and further the necessary measuring device and control mechanism are installed. It is provided at a required position, and is configured to automatically perform all necessary operations by interlocking the control device, the measuring device, and the control mechanism.

With the above structure, the friction welding machine 10 is
For example, a long straight pipe B having a nominal diameter of 8B and a length of 3 to 4 m is housed in the main shaft 42, and the pipe A is fixed to the first gripping device 16 or a pipe component such as an elbow is connected to the other end. The outer burrs and the inner burrs can be immediately removed by friction-welding to A and without removing the pressure-welded pipe.

[0053]

According to the first aspect of the present invention, the main body is formed of a cylindrical body which penetrates the actuating body and can advance and retreat integrally with the actuating body, and the hollow portion of the main spindle. A cutting shaft provided with an inner burr cutting blade, and a second drive device that holds the rear end of the cutting shaft to move it forward and backward and rotate it.
By equipping the friction welding machine with the second gripping device that grips the rear end of the workpiece, which is a long tube, the long tube is housed, held, and housed in the annular space between the spindle and the cutting shaft. The long tube and the long tube fixed to the first gripping device are friction-welded to each other,
In addition, after the press contact, the inner burr can be cut without removing the long tube from the friction welding machine. By using this friction welding machine, it is possible to efficiently perform friction welding between long tubes, which has been difficult in practice in the past.

According to the second aspect of the present invention, the cutting shaft is configured as a combination of the cutting shaft body having the inner burr cutting blade at the tip, the middle pipe and the outer pipe, and the middle pipe front end is inside the outer pipe front end. By engaging the inner peripheral taper surface of the outer pipe front end portion with the outer peripheral taper surface of the middle pipe front end portion,
The front end of the outer tube can be expanded to press the inner peripheral surface of the workpiece. This automatically aligns the cutting shaft body with respect to the work piece, holds it in that position, and increases the rigidity of the cutting shaft body, so that internal burrs can be removed without damaging the inner surface of the work piece. Can be cut smoothly and completely.

In the invention of claim 3, a rotatable ring-shaped roller having an outer diameter larger than the outer diameter of the holder and smaller than the inner diameter of the workpiece B is provided on the outer periphery of the holder concentrically with the holder, and a plurality of rollers are provided. At least one bite tip (one bite tip) is located at the center of the holder at a diameter position slightly larger than the outer diameter of the roller and the rest slightly inside the outer diameter. The rotation phase of the cutting shaft is maintained while the rotation of the cutting shaft is stopped so that one bite tip is positioned on the upper side and the rest is on the lower side so that they are arranged in the peripheral part of the tip surface of the holder in mutually opposite directions. Therefore, the holder freely rotates with respect to the workpiece B as the cutting shaft body rotates, and even if the holder comes into contact with the inner surface of the workpiece due to its own weight, the bite tip is Touch the inner surface of It has become strange. This allows
Inner burr cutting is performed smoothly, and the inner surface of the work piece is not damaged by the bite tip when the cutting shaft is moved back and forth or when the work piece is pulled out from the spindle.

According to the eighth aspect of the present invention, during the pressing step, the inner burr cutting blade is positioned in the vicinity of the joint between the workpieces A and B, but in the rotation direction opposite to the rotation direction of the spindle. By rotating the cutting shaft and immediately cutting the formed inner burr in the pressure welding process including the heating process and the upsetting process, the inner burr can be cut in a soft state before hardening, and the inner burr can be cut. The cutting time can be shortened. Moreover, the positioning of the inner burr cutting blade becomes easy.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a friction welding machine according to the present invention.

2 is a side view of the friction welding machine of FIG. 1. FIG.

FIG. 3 is a longitudinal sectional view of a main shaft.

FIG. 4 is a longitudinal sectional view of a cutting shaft assembly and an inner burr cutting blade.

5 is a partial cross-sectional view of the second drive device of FIG.

FIG. 6 is a partial cross-sectional side view of the front end portion of the outer tube of the cutting shaft assembly.

FIG. 7 is a configuration diagram of an alignment device.

FIG. 8 is a partial cross-sectional view of the sleeve.

FIG. 9 (a) is a cross-sectional view of a bite chip retracting device,
9A and 9B are views I- of FIG. 9A, respectively.
It is sectional drawing of I.

[Explanation of symbols]

 10 One Example of Friction Welding Machine 12 Base 14 Front End 16 First Gripping Device 18 Actuator 20 Rear End 22 Second Driving Device 24 Third Gripping Device 26 First Gripping Device Driving Device 28 First Gripping Device Clamp claw 30 Electric motor 32 Second gripping device 34 Supporting member 36 High thrust hydraulic cylinder 38 Low thrust hydraulic cylinder 40 Shaft 42 Main shaft 44 First journal bearing 46 Second journal bearing 48 Thrust bearing 50 Gear 52 Gear mechanism 54 Collet chuck outer cylinder 56 Collet chuck 58 1st plunger 60 Cylinder cover 62 Tapered surface 68 Outer burr cutting device 71 Cutting shaft combination 72 Cutting shaft body 74 Medium pipe 76 Outer pipe 78 Inner burr cutting blade part 80 Byte tip 81 Byte tip retracting device 82 Holding member 83 leaf spring 84 holder 8 5 Coil Spring 86 Ring-shaped Roller 87 Sliding Piece, Roller 88 Disc Part 89 Elastic Means Holding Part 90 Rod Part 92 Oil Free Bushing 94 Outer Pipe Front End (Inner Deburring Outer Collet) 96 Rear End 98 Mounting Ring 100 Casing 102 Taper Surface 104 Slit 106 Middle pipe front end (inner deburring inner collet) 108 Rear end 110 Second plunger 112 Oil-free bush 120 Rear end 122 Third plunger 130 Journal bearing 132 Thrust bearing 134 Stopper 136 Annular plate 138 Pulley 140 Rotating bearing 142 Mounting plate 144 Connecting rod 146 Three-way chuck 150 Aligning device 152 Hydraulic cylinder 154, 156, 158 Lever 162, 168, 172 Roller 164, 174 Arm 178 Intermediate lever

Claims (8)

[Claims] 1. A tubular work piece, wherein one of the work pieces (workpiece A) is fixed and the other (workpiece B) is brought into contact with the work piece A under pressure while rotating. A friction welding machine for a peripheral joint, comprising a base, a first gripping device fixed on the base, and an actuating body that moves forward and backward with respect to the first gripping device on the base, the actuating body comprising: A first drive device, a main shaft that moves back and forth integrally with the actuating body and is rotated by the first drive device around the advancing / retracting direction line, and an outer burr cutting device that rotates together with the main shaft, Further, the spindle is
In the friction welding machine in which the workpiece B is housed inside thereof and the workpiece B is gripped by a second gripping device provided at the end portion of the first gripping device-side spindle, A cutting shaft formed of a cylindrical body penetrating the body in the advancing and retreating direction, and further having a hollow portion of the main shaft penetrating and extending in the longitudinal direction and having an inner burr cutting blade at the end of the second gripping device side; In order to move the cutting shaft in the longitudinal direction of the main shaft and rotate it around the main shaft axis while being connected to the actuation body on the side opposite to the gripping device and integrally moving back and forth, while holding the other end of the cutting shaft. And a third gripping device that is connected to the actuating member between the actuating member and the second actuating member to integrally advance and retreat and grip the workpiece rotatably, The workpiece B is a long tube, and the long tube is A friction for a long pipe, characterized in that the long pipe is housed in an annular space between the main shaft and the cutting shaft, and one end of the long pipe is held by a second holding device and the other end is held by a third holding device. Crimping machine. 2. The cutting shaft comprises: a cutting shaft main body; and a middle pipe that houses the cutting shaft main body in a hollow portion and has a ring-shaped low friction oilless bush interposed between the cutting shaft main body and the cutting shaft main body. And a combination comprising an outer tube for accommodating the middle tube in a hollow portion, wherein the cutting shaft body is provided with the inner burr cutting blade at an end portion on the second gripping device side and grips the other end. Driven by the second driving device, the inner burr cutting blade is advanced and retracted in the longitudinal direction of the spindle to move in and out through the spindle opening, and is rotated, and the outer pipe has its front end portion behind the inner burr cutting blade of the cutting shaft body. Positioned and provided with an inner peripheral surface formed into a tapered surface whose diameter decreases toward the inner burr cutting blade, and a plurality of slits formed so as to extend to the tip in the longitudinal direction of the main shaft, The rear end is the second drive The front end of the middle pipe is located at or behind the front end of the outer pipe, and has an outer peripheral surface formed into a tapered surface that matches the inner peripheral surface of the front end of the outer pipe. 2. The friction welding machine for a long pipe according to claim 1, wherein a rear end portion is attached to the second drive device so that it can be driven by a drive device to freely move back and forth in the longitudinal direction of the main shaft. 3. The inner burr cutting blade is composed of a plurality of bite tips held by a cylindrical holder attached to the end of the cutting shaft on the side of the second gripping device. A rotatable ring-shaped roller having an outer diameter larger than the outer diameter of the holder and smaller than the inner diameter of the workpiece B is provided concentrically with the holder, and the plurality of bite tips are at least one of the bite tips. One (one bite tip) is at a diameter position slightly larger than the outer diameter of the roller, and the remaining bite tip is at a diameter position slightly inward of the outer diameter. The cutting shafts are arranged in opposite directions to each other with respect to the center of the cutting shaft so that the one bite chip is located on the upper side and the remaining bite chips are located on the lower side. The friction welding machine for a long pipe according to claim 1 or 2, wherein the rotational phase is maintained. 4. The cylindrical holder has elastic means for pressing the cutting shaft downward by pressing the inner peripheral surface of the workpiece B against the holder in the same circumference as the one bite tip. In a directional position, the cutting shaft is pushed downward to bring one bite tip into contact with the inner peripheral surface of the work piece B during the press contacting process in which the work piece B is brought into contact with the work piece A under pressure while rotating. The friction welding machine for a long pipe according to claim 3, wherein the friction welding machine is not provided. 5. The workpiece B inserted outside the cutting shaft assembly is elastically gripped at an outlet through which the cutting shaft assembly penetrates the operating body on the opposite side of the first gripping device. The friction welding machine for a long pipe according to any one of claims 1 to 4, further comprising a centering device for stopping the steady motion of the workpiece B. 6. The aligning device includes a pressing roller that rotates around an axis parallel to the longitudinal direction of the cutting shaft combination at one end, and around a fulcrum symmetrically arranged with respect to the cutting shaft axis. At least three levers that rotate respectively, a link mechanism that moves the other end of the lever so that the pressing roller presses the workpiece B, and a fluid pressure cylinder that drives the link mechanism. The friction welding machine for long pipes according to claim 5. 7. A cylindrical shape having an inner diameter larger than the outer diameter of the workpiece B and an outer diameter smaller than the inner diameter of the main shaft, and having low friction O-rings mounted near both ends thereof. 7. A sleeve adapted to be slidable with respect to the spindle is provided in the spindle, and the workpiece B is inserted into the sleeve. Friction welding machine for long tubes described. 8. The friction welding machine for a long pipe according to claim 1, wherein one of the workpieces (workpiece A) is fixed and the other (workpiece B) is rotated, When the tubular work piece is brought into contact with the work piece A under pressure to join the peripheral joint of the tubular work piece, the work piece is accommodated and held in the main spindle by advancing toward the work piece A while rotating the main spindle. While rotating B, the workpiece B is brought into contact with the workpiece A under pressure, and the inner burr cutting blade is positioned in the vicinity of the joint between the workpiece A and the workpiece B during the pressure welding step of joining the two. While rotating, the cutting shaft is rotated in a rotation direction opposite to the rotation direction of the main shaft, so that the inner burr formed is immediately cut in a pressure welding process including a heating process and an upsetting process. A method for joining a peripheral joint of a tubular work to be characterized.