JP5331360B2 - Friction welding equipment for metal pipe - Google Patents

Description

The present invention relates to a metal tube friction build-up device that forms a friction build-up layer on a metal tube such as a power generation boiler tube.

There is a friction build-up method as a solid phase surface modification technique capable of high-speed film formation without melting the base material and with little dilution.
This friction build-up method is a method in which after the build-up material is adjusted to a predetermined rotational speed, pressure is applied in the axial direction of the build-up material to bring it into contact with the substrate, and the build-up material is heated sufficiently. A method of generating a friction build-up layer by generating steady friction heat at the interface between the build-up material and the base material by moving it relative to the material, and plastically pressing the build-up material onto the base material It is.
When using this method and forming a friction build-up layer on the surface of a metal plate as a base material, for example, after placing the metal plate on a table, pressure is applied to the rotating build-up material to the metal plate. It is made to contact and move (for example, refer to patent documents 1).

JP 2005-14030 A

However, when a metal tube is used as a base material, the metal tube is cylindrical and hollow, so that if the pressure is applied to the rotating build-up material and brought into contact with the metal tube, the metal tube may be crushed by the pressure. There was a problem that the metal tube could not be used. Moreover, if the pressure is weakened to such an extent that the metal tube is not crushed, it is difficult to form a friction build-up layer of a desired shape, and the adhesion strength between the surface of the metal tube and the friction build-up layer is reduced. .
For this reason, conventionally, no attempt has been made to form a friction build-up layer on the surface of a metal tube.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a friction build-up device for a metal tube capable of stably and easily forming a friction build-up layer having a desired shape on the surface of the metal tube.

A friction welding apparatus for a metal tube according to the present invention that meets the above-described object is characterized in that an inner surface jig is brought into contact with the inside of a metal tube to support the metal tube from the inside, and the cladding material rotated at a high speed is used as the metal After pressing against the joint on the outer surface of the tube and moving the metal tube in its length direction to friction build up the outer surface of the metal tube, the metal tube is rotated or moved to move the outer surface of the metal tube A friction build-up device for a metal tube that forms a friction build-up layer on the entire outer surface of the metal tube by sequentially performing the friction build-up,
The inner surface jig includes a backing metal that contacts the inner surface of the metal tube and supports the metal tube from the inside, and first and second tapers that cause the backing metal to contact and release from the inner surface of the metal tube. An operating means comprising a metal fitting, and a rotating shaft that rotates in the circumferential direction of the metal tube and adjusts the pressing force of the operating means on the backing metal,
The backing metal fitting 1) has a divided metal fitting part divided into two parts, and 2) is aligned with the inner surface of the metal pipe on the side of the divided metal fitting part that contacts the inner surface of the metal pipe. A support surface extending along the length direction is formed, and 3) and on the side opposite to the support surface, when viewed from a side cross-section, the support surface is at least 1 degree and 10 degrees in the length direction of the divided metal part. First and second inclined surfaces inclined in the following range are formed,
The first and second taper fittings are arranged opposite to each other centering on a central portion in the length direction of the inner surface jig,
Each of the divided metal parts is slidable with respect to the first and second tapered metal parts via the first and second inclined surfaces, and the first and second tapered metal parts and the rotating shaft part Are connected by a screw mechanism, and the screw mechanism has a right screw and a left screw at the same pitch on both sides around the central portion in the length direction of the inner surface jig, and by rotating the rotating shaft portion, Adjusting the width of the backing metal fitting in the radial direction of the metal tube by moving the first and second taper fittings closer or further away;
Furthermore, a plurality of metal tube load receiving jigs for positioning and receiving the metal tubes each subjected to friction build-up on a jig table movably provided on the gantry, and both sides of the metal tube load receiving jigs And a free side chuck for positioning the metal tube clamped on the metal tube load receiving jig, a drive side chuck for rotating and positioning the metal tube, and the axis of the metal tube. A rotation motor that rotates about the center, and after rotating the metal tube with the inner surface jig arranged inside the metal tube, the other outer surface of the metal tube is rubbed Build up .

In the friction welding apparatus for a metal pipe according to the present invention, a guide groove is formed on one of the sliding surfaces of the split metal part and the first and second taper metal parts of the backing metal. Preferably it is.
In the friction build-up device for a metal pipe according to the present invention, a seizure preventing process is performed on one or both sliding surfaces of the divided metal part and the first and second taper metal parts. Is preferred.

In the friction welding apparatus for a metal pipe according to the present invention, the screw mechanism is preferably a square screw, a trapezoidal screw, or a ball screw.
In the friction welding apparatus for a metal tube according to the present invention, a moving means for moving the metal tube in its length direction is further provided, and the metal tube is disposed in a state where the inner surface jig is disposed inside the metal tube. After the movement, it is preferable to friction build up another outer surface of the metal tube.

The metal pipe friction build-up device according to any one of claims 1 to 5, a backing metal fitting that contacts the inner surface of the metal pipe and supports the inner side of the metal pipe, and an operating means that makes the backing metal piece contact and release from the inner surface of the metal pipe. An inner surface jig having a rotating shaft portion for adjusting the pressing force to the backing metal fitting of this operating means is disposed inside the metal pipe, and a friction build-up layer is formed on the outer surface of the metal pipe supported by the backing metal fitting. Therefore, the friction build-up layer having a desired shape can be stably and easily formed on the surface of the metal tube without crushing the metal tube by using a metal tube friction build-up device having a simple configuration.

Further, the backing metal has a divided metal part formed with an inclined surface inclined at a predetermined angle, and each of the divided metal parts can slide with respect to the taper metal via the inclined surface. By moving the metal fitting in the length direction of the metal tube, the width of the backing metal fitting constituted by the two divided metal fittings can be adjusted. In addition, the taper bracket and the rotating shaft are connected by a screw mechanism, and by rotating the rotating shaft, the taper bracket can be moved in the length direction of the metal tube, and the width of the backing bracket can be adjusted. The width of the backing metal can be easily adjusted with a simple structure.

In addition, the metal pipe friction build-up device has a taper fitting that is opposed to the central part in the length direction of the inner surface jig, and the same pitch that is a screw mechanism on each taper fitting and the rotating shaft part to which it is connected. Since the right and left screws are formed, by rotating the rotating shaft in one direction clockwise or counterclockwise, the taper fittings facing each other can be brought closer to or away from each other, and the operability can be improved.
Also, a rotation motor that rotates the metal tube around its axis is provided, so that the metal tube can be rotated, so that, for example, the same direction is always maintained without changing the joining angle of the joining machine that performs friction build-up For example, friction build-up can be performed from above the metal tube, and the apparatus configuration of the metal tube friction build-up device can be simplified.
In the metal pipe friction build-up device according to the second aspect, since the guide groove is formed on the sliding surface side of the divided metal part or the tapered metal part, it is possible to prevent the positional deviation of the divided metal part with respect to the tapered metal part.
In the metal pipe friction build-up device according to claim 3 , since the seizure prevention process is performed on the sliding surface side of the divided metal part or the taper metal, the metal metal part and It is possible to prevent seizure from occurring with the taper fitting.

Since the screw mechanism is a square screw, a trapezoidal screw, or a ball screw, the metal pipe friction build-up device according to claim 4 can prevent the screw thread from being crushed.
The metal pipe friction build-up device according to claim 5 is provided with a moving means for moving the metal tube in its length direction, whereby the metal tube can be moved in its length direction. Even when friction build-up is performed on the pipe, it is not necessary to move the welding machine that performs the friction build-up along the metal pipe, and the apparatus configuration of the metal pipe friction build-up apparatus can be simplified.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIGS. 1A to 1C are a partial side sectional view, a partial enlarged side sectional view, and a front view, respectively, of the inner surface jig of the metal pipe friction build-up device according to the first embodiment of the present invention. 2 is an explanatory diagram of the metal pipe friction build-up device, and FIGS. 3A to 3C are views of the inner surface jig of the metal pipe friction build-up device according to the second embodiment of the present invention. Partial side sectional view, partial enlarged side sectional view, front view, and FIGS. 4 (A) to (C) are front views of a friction welding apparatus for metal pipes according to third to fifth embodiments of the present invention, respectively. is there.

As shown in FIGS. 1 (A) to 1 (C) and FIG. 2, a metal pipe friction build-up device (hereinafter also simply referred to as a friction build-up device) 10 according to the first embodiment of the present invention is long. The inner surface jig 12 is brought into contact with the inner side of the metal tube 11 to support the metal tube 11 from the inner side, and the build-up material 13 rotated at a high speed is pressed against the joint portion on the outer surface of the metal tube 11, The outer surface of the metal tube 11 is friction built up while moving the length 11 in the length direction, and then the metal tube 11 is rotated (rotated) or moved to sequentially build up the outer surface of the metal tube 11 by friction welding. This is an apparatus for forming a friction build-up layer on a part or all of the outer surface of the tube 11. Here, although the case where friction build-up is performed by pressing the rotating build-up material 13 from above the metal tube 11 will be described below, it may be performed from another direction.

As shown in FIG. 2, the metal pipe friction build-up device 10 includes a gantry 14, a jig table 15 disposed on the gantry 14, and a spindle head 16 that rotates the built-up material 13 at high speed. The spindle head 16 can be raised and lowered, and has a cylinder 16 a that presses the build-up material 13 against the joint portion on the outer upper surface of the metal tube 11.
The jig table 15 includes a plurality of (here, a total of 10) metal pipe load receiving jigs 17 for positioning the metal pipes 11 on which friction welding is performed, and both sides of the metal pipe load receiving jigs 17. A free side chuck 18 for positioning (clamping only) the metal tube 11 placed and placed on the metal tube load receiving jig 17, and a driving side chuck 19 for rotating and positioning (rotation and clamping) of the metal tube 11. And are provided. The drive chuck 19 is provided with an NC rotary table (an example of a rotation motor) 20 so that the metal tube 11 can be rotated (rotated) about its axis. The metal tube 11 may be rotated manually without using an NC rotary table.
Thereby, the metal tube 11 is fixed to the jig table 15 and positioned.

The jig table 15 is configured to be movable on the gantry 14 by a jig table moving servo motor 15a, and the metal tube 11 fixed to the jig table 15 is moved in the length direction thereof. be able to. The gantry 14 and the jig table 15 are provided with a ball screw feeding mechanism (an example of a moving means) that moves the metal tube 11 in the length direction when friction build-up is performed. Instead of the ball screw feed mechanism, a conventionally known feed mechanism such as a rope feed mechanism, a chain feed mechanism, a gear feed mechanism, a link feed mechanism, or a cylinder feed mechanism may be used, or a manual feed mechanism may be used. You may go on.
A shaft 21 is connected to one side (free side chuck 18 side) of the inner surface jig 12 arranged in the metal tube 11, and the shaft 21 protruding from the metal tube 11 is an inner surface jig support jig 21a. Is supported by suspension. A metal tube support jig 21b for suspending and supporting the metal tube 11 is disposed in the vicinity of the inner surface jig support jig 21a.
A rotation (rotation) motor (servo motor) 21 c for the shaft 21 is connected to the end of the shaft 21.

As shown in FIGS. 1A to 1C, the inner surface jig 12 has a backing metal fitting 22 that contacts the inner surface of the metal tube 11 and supports the metal tube 11 from the inside.
This backing metal fitting 22 is made of, for example, chromium molybdenum steel (SCM), and the length L1 of the metal tube 11 in the length direction is, for example, about 300 to 800 mm. The backing metal fixture 22 is symmetrical with respect to the central portion in the length direction of the inner surface jig 12.
The backing metal member 22 has divided metal parts 23 and 24 having the same shape and divided into two parts around the axis of the metal tube 11. The two divided metal parts may have different shapes.

Arc-shaped support surfaces 25 and 26 that coincide with the inner surface of the metal tube 11 are formed on the divided metal fittings 23 and 24, respectively, on the side in contact with the inner surface of the metal tube 11. The support surface 25 (same as the support surface 26) is a surface for supporting the metal tube 11 from the inside when performing friction build-up. Therefore, when the metal tube 11 is viewed in a front sectional view, the axis of the metal tube 11 is used. The angle θ1 around the heart is preferably defined within a range of 90 degrees to 150 degrees (preferably, the lower limit is 100 degrees, further 110 degrees, and the upper limit is 140 degrees, further 130 degrees).
In addition, on the side opposite to the support surface 25 of the divided metal part 23 (same for the divided metal part 24), the thickness in the vertical direction of the divided metal part 23 gradually increases toward the center in the length direction. Inclined surfaces 27 and 28 (first and second inclined surfaces) are formed. This inclined surface 27 (the same applies to the inclined surface 28) has an angle θ2 with respect to the support surface 25 in a side sectional view, and is 1 degree or more and 10 degrees or less in the length direction of the divided metal fitting part 23 (preferably, the lower limit is 2 degrees, The upper limit is 5 degrees).

The inner surface jig 12 has taper metal fittings (wedge metal fittings) 29 and 30 (first and second taper metal fittings) which are examples of operation means for bringing the backing metal fitting 22 into and out of contact with the inner surface of the metal tube 11. ing.
The taper metal fittings 29 and 30 are the same shape comprised, for example with copper or copper alloy. The taper metal fitting 29 and the taper metal fitting 30 are arranged to face each other with the center in the length direction of the inner surface jig 12 as the center, and the length L2 is shorter than half the length L1 of the backing metal fitting 22 (for example, 50 to 180 mm). Degree).
Further, the taper metal fitting 29 (same for the taper metal fitting 30) has a rectangular cross section orthogonal to the axial direction, and the width in the vertical direction (the distance between the surfaces in contact with the divided metal fitting portions 23 and 24) is the inner surface treatment. The width of the tool 12 is gradually reduced toward the center in the length direction (a wedge mechanism is formed).

Each of the divided metal parts 23 and 24 is slidable with respect to the taper metal parts 29 and 30 via the inclined surfaces 27 and 28. The taper metal fitting 29 (same for the taper metal fitting 30) has a reduced width corresponding to the angle θ2 of the inclined surface 27 of the divided metal fitting parts 23, 24. The width of the backing metal fitting 22 in the vertical direction is the same over the length direction of the backing metal fitting 22.
The inclined surfaces 27 of the divided metal parts 23 and 24 are respectively formed in guide grooves 31 and 32 (that is, groove bottoms) that are concave along the length direction of the divided metal part 23. The upper part of the taper metal fitting 29 (same for the taper metal fitting 30) and the lower part of the taper metal fitting 29 are slidably fitted in the guide groove 32, respectively. In addition, a guide groove can also be formed in a taper metal fitting, and in this case, the upper part and the lower part of the divided metal part are slidably fitted into the guide groove.

The inner surface jig 12 has its axis aligned with the axis of the metal tube 11, and rotates clockwise or counterclockwise around the axis of the metal tube 11 (that is, rotates in the circumferential direction). A portion 33 is provided.
The rotary shaft portion 33 is formed with a male screw portion, and this male screw portion is screwed into a female screw portion formed in the axial center direction of the taper fittings 29 and 30 so that the rotation shaft portion 33 and the taper fittings 29 and 30 are connected. It is connected. The male screw portion and the female screw portion constitute a screw mechanism 34. The screw mechanism 34 is a trapezoidal screw, but may be a square screw or a ball screw.
The rotation shaft portion 33 is formed with a right-hand thread on the both sides, that is, on the taper fitting 29 side and a left-hand screw on the taper fitting 30 side at the same pitch with the central portion in the length direction of the inner surface jig 12 as the center. By rotating 33 in one direction, the taper fitting 29 and the taper fitting 30 facing each other can be brought closer to or away from each other. The right and left screws may be reversed.

Further, the rotary shaft portion 33 is disposed between the tapered metal fitting 29 and the taper metal fitting 30 that are arranged to face each other, protrudes from the diameter of the rotary shaft portion 33, and is located at the center in the length direction of the divided metal fitting portions 23 and 24. A positioning portion 37 is provided in the recesses 35 and 36 so as to be freely rotatable. Thereby, position shift of each division metal fitting parts 23 and 24 of backing metal fitting 22 to rotation axis part 33 can be prevented.
With this configuration, when the inner surface jig 12 is used, by rotating the rotation shaft portion 33, the opposing taper fittings 29 and 30 are moved closer to or away from each other in the length direction of the metal tube 11. The pressing force applied to the backing metal fitting 22 can be adjusted, and the width of the backing metal fitting 22 in the radial direction of the metal tube 11 can be adjusted.

In addition, since heat is transferred to the inner surface jig 12 during friction build-up, for example, a nitriding treatment or the like is performed on one or both of the divided metal parts 23 and 24 and the taper metal parts 29 and 30 on the sliding surface side. Although it is good to give a sticking prevention process, it is not necessary to give it.
Further, since there is a risk that the pitch of the taper metal fitting and the rotation shaft portion is shifted due to the difference in thermal expansion between the taper metal fitting and the rotary shaft portion, the taper metal fitting is divided into two or three or more in the length direction, for example, It is good to make a clearance of 1 pitch or 2 pitches or more and screw it to the rotating shaft. Thereby, the difference in thermal expansion can be absorbed by the gap, and the rotation of the rotating shaft portion with respect to the taper fitting can be smoothly performed.

The rotating shaft portion 33 of the inner surface jig 12 described above is connected to the shaft 21 connected to the rotating motor 21c via a universal joint. Thereby, before or after the start of the friction build-up, the rotating shaft portion 33 is rotated, and the divided metal fitting portions 23 and 24 of the backing metal fitting 22 are brought into contact with or separated from the inner surface of the metal tube 11. In addition, you may rotate manually, without using the motor for rotating shaft parts.
As a result, the metal tube 11 can be supported by the backing metal fitting 22.

Then, about the friction build-up method of the metal pipe which concerns on the 1st Embodiment of this invention, using above-described friction build-up apparatus 10, FIG.1 (A)-(C) and FIG.2 are referred. While explaining.
First, a metal tube 11 that performs friction build-up and a build-up material 13 that is used for friction build-up are prepared.
The metal tube 11 is, for example, a steel tube, and has an inner diameter of about 30 to 100 mm and a length of about 1 to 10 m. The metal tube is not limited to this as long as it is made of metal and can be friction built up.
Further, the cladding material 13 is usually a material on which friction cladding is performed, for example, a nickel-based alloy (for example, Inconel, which is a Ni—Cr—Fe alloy, Hastelloy, which is a Ni—Fe—Mo alloy), or the like. Can be used.
Hereinafter, a method for friction build-up of the cladding material 13 on the outer periphery of the metal tube 11 will be described.

1. The rotation of the shaft 21 connected to the rotating shaft portion 33 is stopped, and the rotation of the inner surface jig 12 and the movement in the length direction are fixed. Further, the metal tube 11 is disposed on the jig table 15 of the gantry 14. Note that a plurality of support trolleys that respectively support the long metal tube 11 or the long shaft 21 may be disposed on both sides of the gantry 14, and in this case, the metal tubes provided on each support trolley. It is preferable that the receiving portion 11 and the receiving portion of the shaft 21 have a rolling receiving structure such as a roller.
2. The free side chuck 18 and the drive side chuck 19 are closed, and the metal tube 11 is fixed on the jig table 15.
3. The shaft 21 is set in a free state so that the inner surface jig 12 can be rotated and moved in the length direction. When inserting the inner surface jig 12 into the metal tube 11 arranged on the gantry 14, the distance between the taper metal fitting 29 and the taper metal fitting 30 arranged opposite to each other is increased, and the width of the backing metal fitting 22 is increased. Then, the metal tube 11 is inserted to be narrower than the inner diameter.

4). The rotation motor 21c is operated to reduce the distance between the taper fitting 29 and the taper fitting 30 that are opposed to each other in the length direction of the metal tube 11, and adjust the width of the backing fitting 22 in the radial direction of the metal tube 11. The rotating motor 21 c stops after the support surfaces 25 and 26 of the divided metal parts 23 and 24 of the backing metal 22 are brought into contact with the inner surface of the metal tube 11.
5. The metal tube 11 is fixed by the metal tube load receiving jig 17.
6). By operating the jig table moving servo motor 15 a and moving the jig table 15, the build-up start position of the metal tube 11 is aligned with the spindle head 16.
7). Friction welding is performed at a predetermined position of the metal tube 11. In addition, when performing the friction build-up, the build-up material 13 is rotated at a high speed (for example, about 200 to 1500 times / min), and the build-up material 13 is pressed against the joint portion on the outer surface of the metal tube 11 while being cured. The tool table 15 is moved by a predetermined length (for example, within a range of 5 to 40 cm). After building up, the jig table 15 is returned to the start position (initial position).

8). After the build-up layer of a predetermined length is formed, the fixed state of the metal tube 11 by the metal tube load receiving jig 17 is released.
9. The free side chuck 18 is opened, and the drive side chuck 19 is rotated to a predetermined angle together with the metal tube 11 and the inner surface jig 12 by the NC rotary table 20.
10. The free side chuck 18 is closed, and the metal tube 11 is fixed on the jig table 15.
11. The metal tube 11 is fixed by the metal tube load receiving jig 17.
12 Friction welding is performed at a predetermined position of the metal tube 11. In addition, when performing friction build-up, the jig table 15 is pressed to a predetermined length (for example, within a range of 5 to 40 cm) while pressing the build-up material 13 rotated at a high speed against the joint on the outer surface of the metal tube 11. Move. After the build-up, the jig table 15 is returned to the start position.

13. The rotation of the inner surface jig 12 and the movement in the length direction are fixed.
14 The metal tube 11 is released by the metal tube load receiving jig 17.
15. The rotation motor 21c is rotated in the reverse direction, the distance between the taper metal fitting 29 and the taper metal fitting 30 arranged opposite to each other in the length direction of the metal pipe 11 is increased, and the backing metal piece 22 (that is, the divided metal fitting portion) is separated from the inner surface of the metal pipe 11. 23, 24) are released.
16. The free side chuck 18 is opened, and the fixed state of the metal tube 11 is released.
17. The drive side chuck 19 is rotated together with the metal tube 11 to a predetermined angle by the NC rotary table 20.
18. The free side chuck 18 is closed, and the metal tube 11 is fixed on the jig table 15.
19. The shaft 21 is set in a free state so that the inner surface jig 12 can be rotated and moved in the length direction.

20. The rotation motor 21c is operated, and as described above, the distance between the taper metal fitting 29 and the taper metal fitting 30 is shortened, and the width of the backing metal fitting 22 in the radial direction of the metal tube 11 is adjusted. The support surfaces 25 and 26 of the divided metal parts 23 and 24 are brought into contact with the inner surface of the metal tube 11.
21. The metal tube 11 is fixed by the metal tube load receiving jig 17.
22. Friction welding is performed at a predetermined position of the metal tube 11. In addition, when performing friction build-up, the jig table 15 is pressed to a predetermined length (for example, within a range of 5 to 40 cm) while pressing the build-up material 13 rotated at a high speed against the joint on the outer surface of the metal tube 11. Move. After the build-up, the jig table 15 is returned to the start position.
23. The fixed state of the metal tube 11 is released by the metal tube load receiving jig 17.

24. The free side chuck 18 is opened, and the drive side chuck 19 is rotated together with the metal tube 11 and the inner surface jig 12 to a predetermined angle by the NC rotary table 20.
25. The free side chuck 18 is closed, and the metal tube 11 is fixed on the jig table 15.
26. The metal tube 11 is fixed by the metal tube load receiving jig 17.
27. Friction welding is performed at a predetermined position of the metal tube 11. In addition, when performing friction build-up, the jig table 15 is pressed to a predetermined length (for example, within a range of 5 to 40 cm) while pressing the build-up material 13 rotated at a high speed against the joint on the outer surface of the metal tube 11. Move. After the build-up, the jig table 15 is returned to the start position.
By sequentially repeating the operations in steps 13 to 27 described above, friction build-up is performed on a part (for example, only one side) or all (all circumferential surfaces) of the outer surface of the metal tube 11 supported by the backing metal fitting 22. A composite metal tube with layers can be produced.

Here, the case where the location where the metal pipe 11 is frictionally built in the length direction is changed will be described below. This is because, as shown in Steps 7, 12, 22, and 27 of the method of friction overlaying the above-described build-up material 13, after the build-up, the jig table 15 is not returned to the start position, but at the start position. Do not return.
1. The rotation of the shaft 21 connected to the rotation shaft portion 33 is fixed, and the rotation of the inner surface jig 12 and the movement in the length direction are fixed.
2. The fixed state of the metal tube 11 is released by the metal tube load receiving jig 17.
3. The free side chuck 18 and the drive side chuck 19 are opened, and the fixed state of the metal tube 11 is released.
4). With the metal tube 11 fixed at the buildup end position, only the jig table 15 is moved back to the buildup start position.
5. The free side chuck 18 and the drive side chuck 19 are closed, and the metal tube 11 is fixed on the jig table 15.
6). The rotation motor 21c is rotated in the reverse direction, the distance between the taper metal fitting 29 and the taper metal fitting 30 arranged opposite to each other in the length direction of the metal pipe 11 is increased, and the backing metal piece 22 (that is, the divided metal fitting portion) is separated from the inner surface of the metal pipe 11. 23, 24) are released.

7). The shaft 21 is set in a free state so that the inner surface jig 12 can be rotated and moved in the length direction.
8). The inner surface jig 12 is retracted to the build-up start position.
Thereafter, a part (for example, only one side) or all of the outer surface of the metal tube 11 supported by the backing metal fitting 22 is performed by performing steps 4 to 27 of the method of friction building the above-described cladding material 13. A composite metal tube having a friction build-up layer formed on the (whole circumferential surface) can be manufactured.

Subsequently, a metal pipe friction build-up device according to a second embodiment of the present invention will be described. The same members as those of the metal pipe friction build-up device 10 are denoted by the same reference numerals.
As shown in FIGS. 3A to 3C, the inner surface jig 40 has a backing metal fitting 41 that contacts the inner surface of the metal tube 11 and supports the metal tube 11 from the inside. The backing metal 41 has a function similar to that of the above-described backing metal 22 and is different only in shape, and has divided metal parts 42 and 43. The split metal fittings 42 and 43 are respectively formed with arc-shaped support surfaces 44 and 45 parallel to the inner surface of the metal tube 11 on the side in contact with the inner surface of the metal tube 11, opposite to the support surfaces 44 and 45. On the side, inclined surfaces 46 and 47 are formed so that the thickness of the divided metal fittings 42 and 43 gradually decreases toward the center in the length direction.

The inner surface jig 40 has a rotation shaft portion 33, and taper fittings 48 and 49 are screwed to the rotation shaft portion 33 via a screw mechanism 34. The taper fittings 48 and 49 have the same functions as the taper fittings 29 and 30 described above, and only the shapes thereof are different. The cross section orthogonal to the axial direction is rectangular, and the width in the vertical direction However, the width of the inner surface jig 40 is increased so as to gradually increase toward the center in the length direction.
For this reason, when adjusting the width of the backing metal fitting 41, the taper fitting 48 and the taper fitting 49 which are arranged to face each other are brought close to each other, whereby the width of the backing fitting 41 is narrowed. By separating, the backing metal 41 becomes wider.

A metal pipe friction build-up device (hereinafter also simply referred to as a friction build-up device) according to a third embodiment of the present invention shown in FIG. The jig 50 includes a backing metal 51 that contacts the inner surface of the metal tube 11 and supports the metal tube 11 from the inside.
The backing metal 51 is made of, for example, chromium molybdenum steel (SCM), and the length of the metal tube 11 in the length direction is, for example, about 300 to 800 mm. Further, the backing metal 51 is provided with a support surface 52 having an arcuate cross section on the side in contact with the inner surface of the metal tube 11, and positioned on the opposite side over the length direction of the metal tube 11. A recess 53 is formed.
The support surface 52 of the backing metal 51 is a surface for supporting the metal tube 11 from the inner side when performing friction welding. Therefore, when the metal tube 11 is viewed from the front cross section, the axis of the metal tube 11 is aligned. The center may be defined within a range of 90 degrees to 150 degrees (preferably, lower limit is 100 degrees, further 110 degrees, upper limit is 140 degrees, and further 130 degrees).

Further, the inner surface jig 50 has an elliptical metal fitting (an example of an operating means) 54 having an elliptical cross section for bringing the backing metal piece 51 into and out of contact with the inner surface of the metal tube 11.
When viewed in cross section, the length of the elliptical metal fitting 54 in the major axis direction is such that the major axis is arranged in the radial direction of the metal tube 11, and both outer surfaces thereof are in the recess 53 of the backing metal fitting 51 and the opposite side. The length is set such that the support surface 52 of the backing metal fitting 51 comes into contact with the inner surface of the metal tube 11. On the other hand, the length of the elliptical metal fitting 54 in the minor axis direction is such that the support surface 52 of the backing metal fitting 51 is separated from the inner surface of the metal tube 11 when the minor axis is arranged in the radial direction of the metal tube 11. Is set.
In addition, the rotating shaft part which makes this elliptical metal fitting 54 rotatable is attached to the elliptical metal fitting 54. FIG.

With this configuration, the backing metal 51 can be brought into contact with or detached from the inner surface of the metal tube 11 by rotating the rotation shaft portion by a predetermined angle (here, 90 degrees).
In addition, like the inner surface jig of the friction welding apparatus for metal pipes according to the fourth embodiment of the present invention shown in FIG. A rounded oval metal fitting (an example of an operating means) 55 may be used.
Further, as an inner surface jig of the metal pipe friction build-up device according to the fifth embodiment of the present invention shown in FIG. You may use what has the division metal fitting parts 57 and 58 divided | segmented into two. The split metal parts 57 and 58 have the same shape, and extend in the length direction of the split metal parts 57 and 58 on the opposite side to the surface in contact with the inner surface of the metal tube 11 as in the case of the backing metal 51 described above. Thus, concave portions 59 and 60 for positioning are formed.

Note that the axis of the oval metal fitting 61 as the operating means coincides with the axis of the metal tube 11.
The length of the elliptical metal fitting 61 in the major axis direction is such that the major axis is arranged in the radial direction of the metal tube 11 and both outer surfaces thereof are in contact with the recesses 59 and 60 of the divided metal fitting parts 57 and 58, respectively. In this case, the length is set such that the divided metal fittings 57 and 58 come into contact with the inner surface of the metal tube 11. On the other hand, the length in the minor axis direction of the oval metal fitting 61 is set to a length in which the divided metal fitting portions 57 and 58 are separated from the inner surface of the metal tube 11 when the minor axis is arranged in the radial direction of the metal tube 11. ing.
As described above, the rotating shaft portion is rotated by a predetermined angle (90 degrees in this case), the elliptical metal fittings 54, 55, 61 are rotated, and the metal pipe 11 to which the build-up material is pressed is attached to the backing metal 51, 56. It is possible to manufacture a composite metal tube in which a friction build-up layer is formed on the metal tube 11.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the metal pipe friction build-up device of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Moreover, in the said embodiment, the case where a taper metal fitting was opposingly arranged centering on the center part of the length direction of an inner surface jig | tool was demonstrated .
A plurality of taper fittings may be arranged over the length direction of the metal tube. In this case, the length of the backing metal is determined according to the shape.

Moreover, in the said embodiment, the case where a backing metal fitting was comprised by the division metal fitting part divided | segmented into two was demonstrated .

(A)-(C) are the partial sectional side views, the partial expanded sectional side view, and the front view of the inner surface jig | tool of the friction build-up apparatus of the metal pipe which concern on the 1st Embodiment of this invention, respectively. It is explanatory drawing of the friction build-up apparatus of the metal pipe. (A)-(C) are the partial sectional side view, the partial expanded sectional view, and the front view of the inner surface jig | tool of the friction welding apparatus of the metal pipe which concern on the 2nd Embodiment of this invention, respectively. (A)-(C) are the front views of the friction welding apparatus of the metal tube which concerns on the 3rd-5th embodiment of this invention, respectively.

10: Metal pipe friction build-up device, 11: Metal pipe, 12: Inner surface jig, 13: Overlay material, 14: Mount, 15: Jig table, 15a: Servo motor for moving jig table, 16: Main shaft Head: 16a: Cylinder, 17: Metal tube load receiving jig, 18: Free side chuck, 19: Drive side chuck, 20: NC rotary table (rotation motor), 21: Shaft, 21a: Support jig for inner surface jig 21b: metal tube support jig, 21c: motor for rotation, 22: backing metal fitting, 23, 24: divided metal fitting part, 25, 26: support surface, 27, 28: inclined surface, 29, 30: taper metal fitting (Operating means), 31, 32: guide groove, 33: rotating shaft portion, 34: screw mechanism, 35, 36: recessed portion, 37: positioning portion, 40: inner surface jig, 41: backing metal fitting, 42, 43: Divided metal parts, 44, 45: Holding surface, 46, 47: inclined surface, 48, 49: taper fitting (operation means), 50: inner surface jig, 51: backing metal fitting, 52: support surface, 53: recess, 54: elliptic fitting (operation means) ), 55: Ellipse fitting (operating means), 56: Back fitting, 57, 58: Split fitting, 59, 60: Recess, 61: Elliptical fitting

Claims (5)

An inner surface jig is brought into contact with the inner side of the metal tube to support the metal tube from the inner side, and the cladding material rotated at a high speed is pressed against the joint on the outer surface of the metal tube, and the length of the metal tube is increased. Friction build-up on the outer surface of the metal tube while moving in the direction, and then rotate or move the metal tube to sequentially build up the outer surface of the metal tube, so that the entire outer surface of the metal tube A metal tube friction build-up device that forms a build-up layer,
The inner surface jig includes a backing metal that contacts the inner surface of the metal tube and supports the metal tube from the inside, and first and second tapers that cause the backing metal to contact and release from the inner surface of the metal tube. An operating means comprising a metal fitting, and a rotating shaft that rotates in the circumferential direction of the metal tube and adjusts the pressing force of the operating means on the backing metal,
The backing metal fitting 1) has a divided metal fitting part divided into two parts, and 2) is aligned with the inner surface of the metal pipe on the side of the divided metal fitting part that contacts the inner surface of the metal pipe. A support surface extending along the length direction is formed, and 3) and on the side opposite to the support surface, when viewed from a side cross-section, the support surface is at least 1 degree and 10 degrees in the length direction of the divided metal part. First and second inclined surfaces inclined in the following range are formed,
The first and second taper fittings are arranged opposite to each other centering on a central portion in the length direction of the inner surface jig,
Each of the divided metal parts is slidable with respect to the first and second tapered metal parts via the first and second inclined surfaces, and the first and second tapered metal parts and the rotating shaft part Are connected by a screw mechanism, and the screw mechanism has a right screw and a left screw at the same pitch on both sides around the central portion in the length direction of the inner surface jig, and by rotating the rotating shaft portion, Adjusting the width of the backing metal fitting in the radial direction of the metal tube by moving the first and second taper fittings closer or further away;
Furthermore, a plurality of metal tube load receiving jigs for positioning and receiving the metal tubes each subjected to friction build-up on a jig table movably provided on the gantry, and both sides of the metal tube load receiving jigs And a free side chuck for positioning the metal tube clamped on the metal tube load receiving jig, a drive side chuck for rotating and positioning the metal tube, and the axis of the metal tube. A rotation motor that rotates about the center, and after rotating the metal tube with the inner surface jig arranged inside the metal tube, the other outer surface of the metal tube is rubbed A metal tube friction build-up device characterized by being built-up . 2. A friction welding apparatus for a metal pipe according to claim 1 , wherein a guide groove is formed on a sliding surface side of one of the split metal part and the first and second taper metal parts of the backing metal part. Friction build-up device for metal pipes The metal pipe friction build-up device according to claim 2 , wherein a seizure preventing process is performed on one or both sliding surfaces of the divided metal part and the first and second taper metal parts. A metal tube friction build-up device. The metal pipe friction build-up device according to any one of claims 1 to 3 , wherein the screw mechanism is a square screw, a trapezoidal screw, or a ball screw. . The friction build-up device for a metal tube according to any one of claims 1 to 4 , further comprising a moving means for moving the metal tube in a length direction thereof, wherein the inner surface jig is provided inside the metal tube. After the metal tube is moved in a state where the metal tube is disposed, another metal outer surface of the metal tube is friction built up.

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