JPH081380A - Welding equipment, and mechanism and method for positioning groove part - Google Patents

Abstract

PURPOSE:To provide a welding equipment capable of dispensing the temporary fitting, automatic welding, and obtaining high productivity by reducing the welding time and improving the workability in welding a flanged tube to a branched tube which is projectingly provided on a long main tube. CONSTITUTION:In a welding equipment to weld a branched tube 2 and a flanged tube 3 which are positioned by abutting the edge of the branched tube 2 to be projectingly provided on the circumferential surface of a long main tube 1 on the edge of the flanged tube 3 and in the condition where the groove part is positioned, the branched tube 2 and the flanged tube 3 are opposite to each other e.g. at the position symmetrical to the axis, and welding torches 11, 11 to achieve the welding by being moved by one half circumference along the groove part A of the branched tube 2 and the flanged tube 3 while the opposite condition of both tubes are maintained are provided. The welding torches are moved at least by 360/n along the groove part A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding device for welding a branch pipe provided on a part of the peripheral surface of a long main pipe and a flange pipe in which the edges of the branch pipe are in contact with each other in a groove position alignment. ,
A groove alignment device and alignment method.

[0002]

2. Description of the Related Art For example, there is a long main pipe which is made of aluminum and has a branch pipe projecting from a part of its peripheral surface, and a flange pipe made of aluminum, which is a separate pipe, is provided at the edge of the branch pipe. There is a requirement to weld.

The above-mentioned aluminum material has a large coefficient of thermal expansion as compared with steel pipes and the like, and is greatly affected by thermal deformation in the axial direction of the main pipe in the branch portion and in the direction orthogonal to this axial direction due to welding. There is a difference.

Therefore, prior to actual welding, the flange pipe edge is brought into contact with the branch pipe edge, and the flange pipe is intentionally deformed with respect to the branch pipe to cause so-called misalignment in the welded portion. Align the parts.

Specifically, the main pipe is placed horizontally, the branch pipe is directed upward, and the main pipe is stopped by some means. Then, a flange pipe is placed on the end edge of the branch pipe to cause misalignment in the groove portions which are abutting edge edges of each other, and the groove portions are temporarily attached using a welding torch at a plurality of locations.

After making this temporary attachment, the main pipe 90
Rotate and hold to orient the branch pipe horizontally. Then, the worker performs, for example, TIG welding work along the groove portion.
Further, the groove portion alignment mechanism includes a mechanism for correcting a misalignment of the groove portion and a mechanism for correcting a gap of the groove portion as disclosed in, for example, JP-A-4-127985. It is known to consist of a mechanism for measuring the difference and the amount of gap.

[0007]

As described above, the means for welding the flange pipe made of aluminum material to the branch pipe projecting from the long main pipe made of aluminum material causes a misalignment, and While maintaining the state, the groove part must be temporarily attached and further welded.

Conventionally, all of these series of operations are manually performed by the operator, which is inefficient and requires skill. Moreover, the above-mentioned temporarily attached portion must be finally removed. In order to perform so-called chipping work, it is cut and removed using a grinder. Therefore, extremely large noise is generated in the surroundings and cutting dust is scattered.

Therefore, it is desirable to eliminate the need for temporary attachment and chipping work as welding means under such special conditions. On the other hand, the groove part alignment mechanism described above is a sensor that measures the amount of misalignment and gap,
A converter for calculating the amount of movement of the sensor, a mechanism for correcting the misalignment of the groove portion, a mechanism for correcting the gap of the groove portion, etc. are required, and it is inevitable that the control becomes complicated and the cost becomes high.

The present invention has been made in view of the above circumstances. A first object of the present invention is to weld a flange pipe to a branch pipe protruding from a long main pipe. It is an object of the present invention to provide a welding device that does not require tacking, enables automatic welding, and shortens the welding time and improves workability to obtain high productivity.

A second object of the present invention is to provide a groove position aligning mechanism which has a simple structure and ensures the groove position alignment to improve reliability. A third object of the present invention is to provide a groove part alignment method capable of reliably aligning the groove part with a simple operation and improving workability.

[0012]

In order to satisfy the first object, the welding device according to the first aspect of the present invention provides a welding device according to a first aspect of the present invention, wherein an end of a branch pipe projecting from a peripheral surface of a long main pipe is provided. In a welding device for welding an edge and an edge of a flange pipe in a groove alignment state, a welding torch is provided equally around the groove of the branch pipe and the flange pipe, and the welding is performed. The torch is moved along the groove by at least 360 / n degrees to perform the entire circumference welding of the groove.

In order to satisfy the first object, the welding device according to the second aspect of the present invention provides a welding device according to a second aspect of the invention, wherein an end of a branch pipe and an end of a flange pipe projecting from a peripheral surface of a long main pipe. In a welding device that welds the edge and the groove in a groove aligned position, the groove position for holding and positioning the flange pipe in the axial direction of the main pipe and in a direction orthogonal to the axial direction in a misaligned state A matching mechanism, n pieces are provided evenly around the groove part of the branch pipe and the flange pipe, and are moved at least 360 / n degrees along the groove part to move the entire groove part. A welding torch for performing circumferential welding is provided.

In order to satisfy the second object, the groove position adjusting mechanism according to the third aspect of the present invention is as follows.
A groove portion alignment mechanism for abutting and positioning a branch pipe end edge projecting on a part of the peripheral surface of the main pipe and a flange pipe end edge, and having a diameter dimension smaller than the branch pipe inner diameter dimension. A substrate, a guide jig which is arranged on the substrate, has a tip portion that can be moved back and forth, and is placed on the branch pipe end edge in a protruding state to position the substrate in the branch pipe, and on the substrate. A branch pipe pressure chuck for arranging the tip end of each branch pipe so that the tip of the branch pipe is in contact with the inner peripheral surface of the branch pipe in a protruding state so that the center of the substrate coincides with the center of the branch pipe and the pressure for the branch pipe. A first lining jig provided in parallel with the chuck and provided with a flange tube pressure chuck for pressing the inner peripheral surface of the flange tube to generate a misalignment in the flange tube, and a tip part thereof arranged on the substrate It can move back and forth, and it is in a protruding state A second lining jig that abuts on the inner peripheral surface of the branch pipe to match the center of the substrate with the center of the branch pipe, and the first lining jig provided at the tip of the second lining jig. When the tool causes misalignment in the flange pipe, the flange pipe is provided with a misalignment step portion that causes misalignment in a direction different from the misalignment direction.

According to a fourth aspect, the first lining jig according to the third aspect is wider than the branch pipe in the direction orthogonal to the axial direction of the main pipe in the flange pipe by the pressure chuck for the flange pipe. The second lining jig is characterized in that the second lining jig causes a misalignment step portion to make a misalignment in the flange pipe in a direction along the axial direction of the main pipe and narrower than the branch pipe.

A fifth aspect of the present invention is the first aspect of the present invention.
Of the second liner jig is provided with a plurality of second liner jigs by a pressure chuck for the flange pipe, which causes a difference in the flange pipe in a direction orthogonal to the axial direction of the main pipe and wider than that of the branch pipe. It is characterized in that the respective misalignment step portions cause misalignment in the flange pipe in a direction along the axial direction of the main pipe and narrower than the branch pipe.

In order to satisfy the third object, the groove position aligning method according to the fourth aspect of the present invention provides a guide jig, a branch pipe pressure chuck, and a flange pipe presser member on a substrate. A method of performing alignment using a groove portion alignment mechanism in which a first lining jig including a pressure chuck and a second lining jig including a step portion for misalignment are arranged,
The guide jig is placed on the end edge of the branch pipe while the substrate is inserted into the branch pipe provided in the main pipe, and then the second pipe
Of the inner pipe of the branch pipe is projected and protruded from the inner peripheral surface of the branch pipe, and then the pressure chuck for the branch pipe of the first inner pipe is pressed against the inner peripheral surface of the branch pipe. Then, the guide jig is retracted from the edge of the branch pipe, then the flange pipe is placed on the edge of the branch pipe, and then the pressure chuck for flange pipe of the first lining jig is placed inside the flange pipe. The flange pipe is brought into contact with and pressed against the peripheral surface to cause a wider misalignment in the flange pipe in a direction orthogonal to the axial direction of the main pipe than in the branch pipe. It is characterized in that it is brought into contact with the step portion for misalignment and deformed so that a misalignment narrower in the direction along the axial direction of the main pipe than in the branch pipe is generated.

[0018]

In the first aspect of the present invention, the welding torches are provided equidistantly around the groove portions of the branch pipe and the flange pipe, and the welding torch is at least 360 / n along the groove portions.
The groove is moved around to weld the groove all around. Automatic welding can be performed, and temporary mounting and chipping work are not required.

In the second aspect of the invention, the groove aligning mechanism positions and holds the flange pipe in the axial direction of the main pipe and the direction orthogonal to the axial direction in a misaligned state, and the welding torch as the branch pipe. N pieces are evenly arranged around the groove of the flange pipe, and at least 360 / n are provided along the groove.
The groove is moved around to weld the entire circumference of the groove. Automatic welding can be performed, and temporary mounting and chipping work are not required.

In the third aspect of the invention, as the groove position aligning mechanism, a guide jig for mounting the substrate on the edge of the branch pipe and positioning the substrate in the branch pipe, and a branch for aligning the center of the substrate with the center of the branch pipe A first lining jig equipped with a pressure chuck for a pipe and a pressure chuck for a flange pipe that causes a misalignment in the flange pipe, the center of the substrate is aligned with the center of the branch pipe, and the pressure chuck for the flange pipe is attached to the flange pipe. The second lining jig is provided with a misalignment step portion that causes misalignment in a direction different from the different direction.

In the fourth aspect of the invention, as a groove alignment method, a guide jig is placed on the edge of the branch pipe, and a second lining jig is projected to abut and lock the inner peripheral surface of the branch pipe. Then, the branch pipe pressure chuck of the first lining jig is pressed against the inner peripheral surface of the branch pipe, and the guide jig is retracted from the branch pipe edge so that the flange pipe is placed on the branch pipe edge. It is placed and the flange tube pressure chuck of the first lining jig is pressed against the inner peripheral surface of the flange tube to cause misalignment in the flange tube.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, welding in which a flange pipe 3 is aligned with a branch pipe 2 projecting from the main pipe 1 via a groove alignment mechanism described later, and the branch pipe 2 and the flange pipe 3 are welded. The equipment consists of a main pipe support 4 and a welding machine body 5.
Composed of and.

The main pipe support 4 supports the main pipe 1.
The main pipe 1 is oriented horizontally in the axial direction, and the branch pipe 2 provided on a part of its peripheral surface is oriented directly above. The welder body 5 is arranged near the main pipe support 4. The welding machine main body 5 is arranged along the longitudinal direction of the main pipe 1 in parallel with a base 6, and is supported on the base in a standing position, and in the X direction along the longitudinal direction of the base. A movable column 7, a movable arm 8 in a Y direction that is a direction orthogonal to the X direction of the column, and a Z direction that is a vertical direction, and a suspended end portion of the arm 8. And a torch support portion 9.

The torch support portion 9 is rotatably supported by the arm portion 8 and its position is fixedly held. A pair of support rods 1 is provided on the lower surface side.
0 and 10 are erected. The support rods 10 and 10 are provided at symmetrical positions with respect to the center point, and are simultaneously movable in the directions toward and away from each other while maintaining the symmetrical positions. Furthermore, it can be freely rotated by a predetermined angle.

At the lower ends of the support rods 10 and 10 as described above,
Welding torches 11, 11 are provided respectively. That is, the welding torches 11 and 11 maintain their symmetrical positions with respect to the center point, the distance between them changes, and they can swing freely, and the movement in the circumferential direction and the movement in the X, Y, and Z directions are possible. You are free.

As shown in the figure, the welding torches 11, 11 are opposed to the groove portions A of the branch pipe 2 and the flange pipe 3 so as to perform a welding action and the torch support portion 9 is 180 °.
Rotate. The pair of welding torches 11, 11 weld the groove portions A by 180 °, respectively, and complete the entire circumference welding.

By using such a welding device,
Performs reliable and reliable welding automatically and in a short time. Moreover, so-called temporary mounting work is not required, and accompanying this, the work of shaving is unnecessary, there is no noise, and cutting powder does not scatter, and an ideal working environment is obtained.

The welder main body 1 has a structure capable of coping with all forms regardless of the total length of the main pipe 1 or the position and diameter of the branch pipe 2 protruding therefrom. If all of the main pipe 1, the branch pipe 2, the flange pipe 3 and the like are made of aluminum, for example, the branch pipe 2
Since the rising height of the branch pipe differs between the axial direction of the main pipe 1 and the direction orthogonal to the main pipe 1, the rigidity of the branch pipe greatly differs, and the difference in thermal deformation becomes remarkable depending on the direction.

If the flange pipe 3 is welded to the branch pipe 2 as it is, there is a risk that misaligned steps will occur at these welded portions. Therefore, by using a groove alignment mechanism as described below, the flange pipe 3 is misaligned with the branch pipe 2 as shown in FIG. 2 (A) before welding, and this state is maintained. By performing the above-described welding, a welded finish in which the branch pipe 2 and the flange pipe 3 have the same inner and outer diameters as shown in FIG.

The direction of the misalignment will be further explained. In the axial direction of the main pipe 1 (hereinafter referred to as the X direction), a narrower misalignment is generated in the flange pipe 3 than the branch pipe 2 and is orthogonal to the axial direction. In the direction (hereinafter, referred to as the Y direction), the flange pipe 3 must have a larger misalignment than the branch pipe 2.

As shown in FIG. 3, the groove position adjusting mechanism K is constructed. In the figure, reference numeral 15 is a substrate, which is a disk having a diameter smaller than the inner diameter of the branch pipe 2.

On this substrate 2, the first direction is along the direction orthogonal to the axial direction of the main pipe 1 (hereinafter referred to as the Y direction).
Of the main pipe 1 (hereinafter, X
The second jig 17 is arranged in a direction along the direction (referred to as a direction), and a plurality of guide jigs 18 are radially arranged between the first and second jigs 16 and 17.

First, the guide jig 18 will be described. As shown in FIG.
It is arranged and fixed on the upper side, and the operating rod 2 is attached to the jig body 19.
0 is set so that it can move back and forth.

An L-shaped hooking member 21 is provided at the tip of the operating rod 20 and is placed on the end edge of the branch pipe 2 in a protruding state to mount the substrate 15 on the branch pipe. It is designed to be located within 2.

As shown in FIG. 5, in the first lining jig 16 arranged along the Y direction, the flange tube pressure chuck 21 and the branch tube pressure chuck 22 are vertically stacked. Composed of.

The rods 21a and 22a projecting from both sides of the chucks 21 and 22 can move back and forth by the same amount at the same time, and the hook 21 of the guide jig 18 is located on the edge of the branch pipe 2. Pressure chuck for branch pipe 2 in the locked state
The tip of the rod portion 22 a of the second rod 2 can abut the inner peripheral surface of the branch pipe 2.

Further, in this state, the pressure chuck 21 for the flange pipe is in a position projecting outward from the edge of the branch pipe 2. As shown in FIG. 6, the second lining jig 17 is
The fixing jig 23 is arranged at a position along the X direction on one end side of the substrate 15, and the pressure cylinder 24 is arranged on the other end side.

These fixing jig 23 and pressure cylinder 24
Gradient step portions 25 and 26 are provided at the tips, respectively. In each of these misalignment step portions 25 and 26, the lower end surfaces 25a and 26a project, and the upper end surface 25
b and 26b are at the retracted position, and the step amounts are equal to each other.

Then, the lower end surface 25a of the misalignment step portion 25 of the fixing jig 23 is held in contact with the inner peripheral surface of the branch pipe 2 and the pressurizing cylinder 24 is projected to make the misalignment. With the lower end surface 26a of the step portion 26 in contact with the inner peripheral surface of the branch pipe 2, the upper step end surfaces 25b and 26b of the respective misalignment step portions 25 and 26 project outward from the end edge of the branch pipe 2. It is like this.

Since the groove position adjusting mechanism K is constructed as described above, first, the substrate 15 is attached to the main pipe 1.
It is inserted in the branch pipe 2 provided in the above, and the operating rod 20 of each of the guide jigs 18 is projected in this state. The latching pieces 21 provided at the tips of these operating rods 20 are all mounted on the edge of the branch pipe 2.

That is, in the state as shown in FIG. 4, the substrate 15 is inserted into the branch pipe 2. Then, the second lining jig 17 is projected. That is, the pressurizing cylinder 24 is projected, and the tip end surface of the misalignment step portion 26 is brought into contact with the inner peripheral surface of the branch pipe 2. At this time, the fixing jig 23
If there is a gap between the tip of the misalignment step portion 25 and the inner peripheral surface of the branch pipe 2, the pressurizing cylinder 24 is further continued to project.

When the tips of the lower step end surfaces 25a and 26a of the step difference portion of both the pressurizing cylinder 24 and the fixing jig 23 come into contact with the inner peripheral surface of the branch pipe 2 and engage with each other, pressurize the pressurizing cylinder 24. Stop. The state shown in FIG. 6 is reached, and the upper step end surfaces 25a and 26a of the respective step difference portions project outward from the end edges of the branch pipe 2.

Next, the branch pipe pressure chuck 22 of the first lining jig 16 is brought into contact with the inner peripheral surface of the branch pipe 2. That is, the rod portions 22a, 22a on both sides are projected at the same time,
These tip surfaces are brought into contact with the inner peripheral surface of the branch pipe 2, and the rod portion is projected so that sufficient pressure is applied.

In this state, the flange tube pressure chuck 2
1 projects outward from the edge of the branch pipe 2, but the rods 2 on both sides
The tips of 1a and 21a are retracted sufficiently inside the inner diameter of the branch pipe.

Then, the hooking piece 21 of the guide jig 18 is retracted inward from the end edge of the branch pipe 2 to remove the engagement between the guide jig and the branch pipe. Already, the first and second lining jig 1
6 and 17 are hooked on the branch pipe 2, and the groove position adjusting mechanism K does not have any position fluctuation.

Then, the flange pipe 3 is placed on the edge of the branch pipe 2. Then, the flange tube pressure chuck 21 of the first lining jig 16 is brought into contact with the inner peripheral surface of the flange tube 2 and performs a pressing action with an extremely high pressure.

From the arrangement of the first lining jig 16,
As shown in FIG. 5, the flange pipe 3 is Y with respect to the branch pipe 2.
A wide misalignment occurs in the direction and wider than this branch pipe. Then, due to the occurrence of misalignment in the Y direction, the flange pipe 3 is
As indicated by the chain double-dashed line, the abutment deformation occurs on the double-difference step portions 25 and 26 of the second lining jig 17, and a narrower misalignment than the branch pipe 2 occurs in the X direction.

After all, as shown in FIG. 2 (A), the flange pipe 3 has a larger misalignment in the Y direction than the branch pipe 2 due to the first lining jig 16, and the second inner pipe 16 The misalignment step portions 25 and 26 of the tension jig 17 cause a misalignment narrower than that of the branch pipe 2 in the X direction, and this condition is held by each jig.

By performing welding with the welding torches 11, 11 on the groove portion A thus formed, the thermal deformation of the branch pipe 2 differs depending on the direction. Flange pipe 3 and branch pipe 2 as shown
Welding with the same diameter can be obtained.

In the above embodiment, the pair of welding torches are provided in equal distribution. However, the present invention is not limited to this, and n welding torches are evenly arranged and the welding torches are provided in the flange pipe. 3 along groove A at least 360 /
Any number may be used if it is moved by n degrees.

Further, in the above embodiment, one set of the second lining jig 17 is provided together with the first lining jig 16, but the branch pipe 2 and the flange pipe 3 having large diameters are used. However, the present invention is not limited to this.

That is, as shown in FIG. 7, when welding a large-diameter flange pipe to a large-diameter branch pipe 2A, a long first pipe having basically the same configuration along the Y direction is used.
The second lining jig 17A includes a fixing jig 23 and a pressurizing cylinder 24, which are provided so as to face each other in the X direction, and these first lining jig 16A. 16
And a plurality of pressurizing cylinders 24, which are provided between A and A (interval of about 45 °).

A guide jig is provided between the pressurizing cylinder 24 other than the X direction and the first lining jig 16A and between the fixing jig 23 and the pressurizing cylinder 24 in the X direction. The tool 18 is arranged.

The fixing jig 23 constituting the first lining jig 17A, each pressurizing cylinder 24 and the guiding jig 18 are basically the same as those described above. There is no problem.

Such a first lining jig 16A and a second lining jig 16A
The operations of the lining jig 17A and the guide jig 18 are exactly the same as those described above. As a result, even in the large-diameter branch pipe 2A and the flange pipe, differences in directionality are obtained, and the diameters of the welded pipes are the same.

[0056]

As described above, the welding apparatus according to the first aspect of the invention eliminates the need for temporary attachment and automatic welding when welding a flange pipe to a branch pipe protruding from a long main pipe. This makes it possible to shorten the welding time and improve workability to obtain high productivity.

The groove part alignment mechanism of the second aspect of the present invention has a simple structure and ensures the groove part alignment, and has the effect of obtaining the groove part alignment with improved reliability. The groove part alignment method according to the third aspect of the invention has the effect of reliably aligning the groove part with a simple operation and improving workability.

[Brief description of drawings]

FIG. 1 is a side view of a welding apparatus showing an embodiment of the present invention.

FIG. 2A is a plan view of the main pipe for explaining the occurrence of misregistration in the embodiment. (B) is a plan view of the main pipe for explaining a welding completion state.

FIG. 3 is a plan view of a groove aligning mechanism that hooks a branch pipe provided in a main pipe of the embodiment.

FIG. 4 is a diagram showing how a guide jig is attached in the embodiment.

FIG. 5 is a view showing the attachment of the first lining jig of the embodiment.

FIG. 6 is a view showing the attachment of a second lining jig of the same embodiment.

FIG. 7 is a plan view of a groove portion alignment mechanism of another embodiment.

[Explanation of symbols]

1 ... Main pipe, 2 ... Branch pipe, 3 ... Flange pipe, A ... Groove part,
K ... Groove position alignment mechanism, 11 ... Welding torch, 15 ...
Substrate, 18 ... Guide jig, 16 ... First lining jig, 2
2 ... Pressure chuck for branch pipe, 21 ... Pressure chuck for flange pipe, 17 ... Second lining jig, 23 ... Fixing jig, 2
4 ... Pressurizing cylinder, 25, 26 ... Step portion for misalignment.

Claims (6)

[Claims] 1. A welding device for welding an end edge of a branch pipe and an end edge of a flange pipe projecting from a peripheral surface of a long main pipe in a groove position alignment state, wherein a welding torch is the branch. The welding torch is provided equidistantly around the groove of the pipe and the flange pipe, and the welding torch is moved along the groove by at least 360 / n degrees to perform the entire circumference welding of the groove. A welding device characterized in that 2. A welding device for welding an end edge of a branch pipe and an end edge of a flange pipe projecting from a peripheral surface of a long main pipe in a groove position alignment state, wherein the flange pipe is A groove part alignment mechanism that positions and holds the main pipe in the axial direction and a direction orthogonal to this axial direction in a misaligned state, and is equally distributed around the groove parts of the branch pipe and the flange pipe. n pieces are provided and at least 36 along the groove.
A welding device, comprising: a welding torch that moves by 0 / n degrees to perform the entire circumference welding of the groove portion. 3. A welding device for welding the end edge of a branch pipe and the end edge of a flange pipe projecting on the peripheral surface of a long main pipe in a groove position aligned state, the peripheral surface of the main pipe. A groove portion alignment mechanism that positions the branch pipe end edge projecting in a part and the flange pipe end edge by abutting, and a substrate having a diameter dimension smaller than the branch pipe inner diameter dimension. A guide jig which is arranged on the substrate, has a tip portion that can be moved back and forth, and is mounted on the edge of the branch pipe in a protruding state to position the substrate in the branch pipe; A pressure chuck for a branch pipe and a pressure chuck for the branch pipe in which the tip ends of the branch pipe are in contact with the inner peripheral surface of the branch pipe in a projecting state so that the center of the substrate coincides with the center of the branch pipe; It is provided in parallel and presses the inner peripheral surface of the flange pipe to The first lining jig provided with a pressure chuck for the flange pipe that causes a misalignment in the flange pipe, and the tip of the lining jig, which is arranged on the above-mentioned substrate and can be moved forward and backward, and is protruded. A second lining jig that abuts on the peripheral surface and matches the center of the substrate with the center of the branch pipe, and the first lining jig is provided at the tip of the second lining jig, and the first lining jig is the flange pipe. A groove position aligning mechanism comprising a misalignment step portion that causes misalignment in a direction different from the misalignment direction when the misalignment occurs in the flange tube. 4. The first lining jig produces a misalignment in the flange pipe in a direction orthogonal to the axial direction of the main pipe and wider than the branch pipe by a pressure chuck for the flange pipe. 4. The groove part alignment mechanism according to claim 3, wherein the lining jig generates a misalignment in the flange pipe in the direction along the axial direction of the main pipe and narrower than the branch pipe by the misalignment step portion. . 5. The first lining jig uses a pressure chuck for a flange pipe to generate a misalignment in the flange pipe in a direction orthogonal to the axial direction of the main pipe and wider than the branch pipe. 4. A plurality of lining jigs are provided, and each of the misalignment step portions causes a misalignment in the flange pipe in a direction along the axial direction of the main pipe and narrower than the branch pipe. Groove position alignment mechanism. 6. A first jig having a guide jig, a branch pipe pressure chuck and a flange pipe pressure chuck on a substrate.
This is a method of aligning by using a groove alignment mechanism in which the inner lining jig and the second inner lining jig provided with a step portion for misalignment are arranged. The guide jig is placed on the edge of the branch pipe in a state where it is inserted into the branch pipe, and then the second lining jig is projected and abutted against the inner peripheral surface of the branch pipe. The pressure chuck for the branch pipe of the first lining jig is contacted and pressed against the inner peripheral surface of the branch pipe, then the guide jig is retracted from the edge of the branch pipe, and then the flange is placed on the edge of the branch pipe. Place the pipe, then press the flange pipe pressure chuck of the first lining jig against the inner peripheral surface of the flange pipe to press the flange pipe, and branch the flange pipe in the direction orthogonal to the axial direction of the main pipe. A misalignment wider than that of the pipe is generated, and this misalignment causes the flange pipe to become the misalignment step of the second lining jig. A groove aligning method, characterized in that the groove is abutted and deformed to generate a narrower gap in a direction along the axial direction of the main pipe than that of the branch pipe.