JP2021154373A - Apparatus for manufacturing flanged piping - Google Patents

Abstract

To provide an apparatus for manufacturing flanged piping, which can increase strength of junction of piping and a flange and enhance durability.SOLUTION: A control part 7 controls a rotary drive part 5 and adjusts a rotational speed of piping 10 so as to adjust welding speeds of outside and inside welders 22 and 23. The control part controls a weld zone 6 so as to adjust each electric current for being supplied to the outside and inside welders 22 and 23. Thus, an in-hole wall surface at an end of the piping 10 and a connection surface of a flange 11 are welded not to produce a surplus molten pool between them.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a flanged pipe manufacturing apparatus that welds a flange to the end of a pipe.

In order to simplify the connection work of pipes at construction sites and the like, a flange is provided at the end of the pipe, the flanges of each pipe are joined to each other, and these flanges are fixed by bolting.
The prefabricated pipe used for such work has a flange welded to the end of the pipe in advance at a factory or the like, and is configured so that welding work does not occur when the pipe is joined at a construction site or the like. ..

For example, when manufacturing a pipe (steel pipe) of an arbitrary length having a first flange and a second flange at both ends, the following manufacturing work is performed.
The above pipe is divided into a first pipe and a second pipe. The first flange is welded to one end of the first pipe, and the second flange is welded to one end of the second pipe.
For example, when manufacturing a pipe in which a part of the pipe is bent, a curved pipe is used as the first pipe and a straight pipe is used as the second pipe.
Next, the other end of the first pipe and the other end of the second pipe are welded to form a pipe having a flange (see, for example, Patent Document 1).

Japanese Patent No. 2632630

When joining a flange to the end of a pipe, welding is performed on the outer peripheral side of the pipe, and when this flange is fixed to the flange of a structure or other pipe, for example, when stress is applied to the pipe, the welded part The joint strength may be insufficient due to the tendency for defects such as cracks to occur.
In addition, if only the outer peripheral side of the pipe of the joint portion is welded, a minute gap or the like may be generated on the inner side of the pipe of the joint portion, and gas or liquid may enter the gap or the like and deterioration such as corrosion progresses. There is.

The present disclosure has been made in view of the above problems, and provides a flanged pipe manufacturing apparatus capable of increasing the joint strength between a pipe and a flange and improving the durability.

The flanged pipe manufacturing apparatus of the present disclosure includes a support portion that supports the flange and a rotary drive portion that rotates a pipe inserted into a through hole provided in the center of the connection surface from the back surface side of the connection surface of the flange. A welded portion that welds an end portion of the pipe inserted into the through hole and the flange, and a control portion that controls the operation of the rotation drive portion and the operation of the welded portion. An outer welder that welds the outer periphery of the end of the pipe and a portion on the back surface side of the flange, and an inner welder that welds the inner wall surface of the hole at the end of the pipe and the portion on the connection surface side of the flange. The control unit adjusts the welding speeds of the outer welding machine and the inner welding machine by controlling the rotation driving unit and adjusting the rotation speed of the pipe, and controls the welding portion. Then, each current supplied to the outer welding machine and the inner welding machine is adjusted to weld the outer periphery of the end portion of the pipe and the back surface side portion of the flange with a predetermined strength, and the hole at the end portion of the pipe. It is characterized in that welding is performed so that an excess molten pool is not generated between the inner wall surface and the connecting surface of the flange.

Further, in the control unit, the inner welding is performed so that the welding pond formed between the hole inner wall surface at the end of the pipe and the connection surface of the flange does not protrude from both the hole inner wall surface and the connection surface. It is characterized by adjusting the current supplied to the machine.

Further, when welding is performed by the outer welding machine, the control unit controls the rotation drive unit to rotate the pipe at a rotation speed at which an annular molten pool is formed along the outer periphery of the pipe. When welding is performed by the inner welding machine, the rotation driving unit is controlled to rotate the pipe at a rotation speed at which an annular molten pool is formed along the inner wall of the hole of the pipe.

According to the present disclosure, sufficient strength and durability can be provided at the joint portion between the pipe and the flange by performing welding on the outer peripheral side and the inner side of the pipe, respectively.

It is explanatory drawing which shows the schematic structure of the flanged pipe manufacturing apparatus by embodiment of this disclosure. It is explanatory drawing which shows the structure of the upper part of the rotation drive part of FIG. It is explanatory drawing which shows the state of the pipe and the flange supported by the support roller of FIG. It is explanatory drawing which shows the state of the part welded by the flanged pipe manufacturing apparatus of FIG.

Hereinafter, embodiments of the present invention will be described.
Here, the flanged piping manufacturing apparatus is referred to as the piping manufacturing apparatus 1.
FIG. 1 is an explanatory diagram showing a schematic configuration of a pipe manufacturing apparatus 1 according to an embodiment of the present disclosure. The piping manufacturing apparatus 1 is, for example, a base 2 mounted on a floor surface and extended in the horizontal direction, a machine frame 3 arranged vertically at one end of the base 2 in the longitudinal direction, and a base. It is configured to include a machine frame 4 arranged at the other end of the base 2 in the longitudinal direction.
Further, the pipe manufacturing apparatus 1 supports a part of the pipe 10 which is a metal pipe material from below, and welds flanges 11 and 12 to each end of the rotary drive unit 5 and the pipe 10 which rotates the pipe 10 in the circumferential direction. It is provided with a control unit 7 for controlling the operation of the welded portion 6, the rotary drive portion 5, the welded portion 6, and the like.

The base 2 is formed in a flat plate shape that can be installed horizontally on, for example, the floor surface of a work place, and is provided with a guide rail 8 on the upper surface or the like.
When the guide rail 8 abuts on the lower portion of the rotary drive unit 5 so that the rotary drive unit 5 can move on the upper surface of the base 2, and the pipe 10 is installed in the pipe manufacturing apparatus 1, the guide rail 8 of the pipe 10 It extends along the longitudinal direction (provided between the machine frame 3 and the machine frame 4).
In other words, when the rotation drive unit 5 moves on the upper surface of the horizontally provided base 2, the guide rail 8 determines the movement direction (track) of the rotation drive unit 5 and drives the rotation on the upper surface of the base 2. It is configured to position the portion 5.

As described above, the pipe 10 is a metal pipe material, for example, a pipe material formed in a straight tubular shape using a steel material, and is a so-called prefabricated pipe in which flanges 11 and 12 are joined to both longitudinal ends, respectively.
The flange 11 and the flange 12 are formed, for example, in the same size and shape. Here, the configuration of the flange 11 will be described as an example.

The flange 11 is formed in a substantially disk shape having a smooth flat connecting surface 11a described later by using the same steel material as the pipe 10, and the pipe 10 can be inserted into the center of the circular connecting surface 11a. It has a through hole (not shown) with a diameter that allows it to be formed. The hole diameter of the through hole is substantially the same as the outer diameter of the pipe 10, and is preferably formed to fit.
Further, the flange 11 is provided with a plurality of bolt holes (not shown) through which bolts used for connection fixing are inserted, for example, when connecting and fixing to another flange or the like.
Note that FIG. 1 illustrates a state in which the flange 11 is welded to one end of the pipe 10 (and the other end of the pipe 10 is inserted into the through hole of the flange 12).

The machine frame 3 is provided with, for example, two support rollers 21 on the upper portion. The two support rollers 21 are arranged side by side in the horizontal direction, and the encoder 14 is connected to one or both of them.
The support roller 21 is formed like, for example, a pulley for hanging a drive belt, has protruding portions protruding in the radial direction at both ends of the outer peripheral surface, and is sandwiched between the central portions of the outer peripheral surface (sandwiched between the two protruding portions). The portion) is provided with a rim portion recessed on the back side (rotating shaft side) of the protruding portion.
In other words, the support roller 21 is provided with a groove portion having a substantially U-shaped cross section so as to orbit the outer peripheral surface, and is formed so that the outer peripheral portion of the flange 11 (flange 12) is inserted into the groove portion.

The support roller 21 has, for example, an encoder 14 connected to the rotation shaft of the support roller 21, and detects the rotation speed of the support roller 21, the rotation speed of the flange 11 that abuts on the support roller 21, and the like. It is configured to let you.
The main body of the encoder 14 or the like is installed inside the machine frame 3, for example, and is wired and connected so as to input the output signal of the encoder 14 to the control unit 7 (rotation control unit 16).
The support portion for supporting the flange 11 and the like is configured by the support roller 21, the machine frame 3 and the like for arranging the support roller 21 at a predetermined height.

The rotary drive unit 5 is moved to an appropriate position along the guide rail 8 as described above, and is installed at a position where the pipe 10 can be supported in a stable state. In the pipe manufacturing apparatus 1 shown in FIG. 1, the rotary drive unit 5 is installed on the machine frame 4 side, that is, at a position supporting the vicinity of the flange 12 installed on the pipe 10.
The rotary drive unit 5 includes, for example, two drive rollers 20 having an outer peripheral portion projecting upward.
Further, inside the rotary drive unit 5, a drive mechanism unit 13 including a power source for rotationally driving the drive roller 20 is provided.

The drive mechanism unit 13 includes, for example, a motor as a power source, and also includes a mechanism unit that transmits the rotational driving force of the motor to the drive roller 20.
The drive mechanism unit 13 is configured to rotate and drive two drive rollers 20 in the same direction, for example, and is connected by wiring so that the rotation control unit 16 controls the rotation drive.
That is, the drive mechanism portion 13 is configured to start / stop the rotation of the drive roller 20, adjust the rotation speed, and the like in response to the control signal output from the rotation control unit 16.

FIG. 2 is an explanatory diagram showing a configuration of an upper portion of the rotation drive unit 5 of FIG. This figure shows the configuration of the upper portion of the rotary drive unit 5 when the machine frame 3 side (or the machine frame 3 side to the machine frame 4 side) is viewed from the machine frame 4 side of FIG. It represents a state in which the pipe 10 is placed on the two drive rollers 20 (a state in which the pipe 10 is installed in the pipe manufacturing apparatus 1).
The pipe 10 in FIG. 2 represents a cross section of a portion that abuts (supports) the drive roller 20.

The two drive rollers 20 are arranged in the rotation drive unit 5 so that their respective rotation axes are parallel to each other and, for example, the two rotation axes are lined up at the same height. In other words, the two drive rollers 20 are installed in the rotation drive unit 5 so that the extension direction of the pipe 20 mounted on the upper side of the drive roller 20 and each rotation axis are parallel to each other. As shown in FIG. 2, the drive roller 20 places the outer peripheral portion of the pipe 10 between the two drive rollers 20 so that the outer peripheral portions do not come into contact with each other and on the upper portion of the drive roller 20. They are arranged as far apart as possible.
When the two drive rollers 20 separated in this way are rotationally driven in the same direction, the pipe 10 placed so as to come into contact with the outer peripheral portion of each drive roller 20 rotates in the opposite direction of the rotational drive. ..

As shown in FIG. 1, the pipe manufacturing apparatus 1 includes, for example, a welded portion 6 in the vicinity of the machine frame 3, and supports the outer welder 22 and the inner welder 23 constituting the welded portion 6 with support rollers 21 and the like. It is placed in the vicinity of.
The welding unit 6 is connected to the control unit 7 by wiring, and is individually welded to the outer welding machine 22 and the inner welding machine 23 in response to a control signal output from the welding control unit 15 constituting the control unit 7. It is configured to perform operations.
The outer welding machine 22 and the inner welding machine 23 are, for example, plasma welding machines. The inner welding machine 23 is arranged on the connection surface 11a side of the flange 11 supported by the support roller 21, and the piping 10 is connected to the flange 11. The outer welding machine 22 is arranged on the extended side, that is, on the back side of the connecting surface 11a.

FIG. 3 is an explanatory view showing a state of the pipe 10 and the flange 11 supported by the support roller 21 of FIG. This figure shows the arrangement of the two support rollers 21 when the machine frame 3 side is viewed from the machine frame 4 side of FIG. 1, and shows a state in which the flange 11 is placed on the two support rollers 21. ing. The flange 11 in FIG. 3 represents a state in which one end of the pipe 10 is inserted into the central through hole.

The two support rollers 21 are installed on the machine frame 3 so that the rotation axes of the support rollers 21 are parallel to each other and are aligned at the same height.
In the two support rollers 21, the vicinity of the other end of the pipe 10 (the end on the side where the flange 12 is inserted) is supported by the drive roller 20 of the rotary drive unit 5, and the flange into which one end of the pipe 10 is inserted. The outer peripheral portion of 11 is arranged at a height at which the pipe 10 becomes horizontal when the support roller 21 supports it.
When the flange 11 (in which the pipe 10 is inserted) is placed between the two support rollers 21, the outer peripheral edge portion of the flange 11 has a substantially U-shape provided on each support roller 21. Each of them is inserted into the groove portion, and the flange 11 and the pipe 10 are positioned and supported so as not to wobble in the extending direction of the pipe 10. In this way, the flange 11 is positioned and supported by two support rollers 21 at two outer peripheral portions that are appropriately separated from each other.

Next, the operation will be described.
FIG. 4 is an explanatory view showing a state of a portion welded by the pipe manufacturing apparatus 1 of FIG. This figure shows a cross section of the pipe 10 and the flange 11. A state in which one end of the pipe 10 is inserted into the through hole of the flange 11 and welded to the outer peripheral portion of the flange 11 and the inside of the through hole of the flange 11. Represents.

First, for example, the connection surface 11a of the flange 11 is directed toward the machine frame 3, and the flange 11 is placed between the two support rollers 21, and one end of the pipe 10 is placed from the back side of the connection surface 11a. Is inserted into the through hole of the flange 11, and the other end side of the pipe 10 is placed on the rotary drive unit 5. In this way, the flange 11 placed on the support roller 21 and one end of the pipe 10 are welded and joined.
Further, the flange 11 is replaced with the flange 12, and the flange 11 is placed between the two support rollers 21. The other end of the pipe 10 is inserted into the through hole of the flange 12, and the flange 12 and the pipe 10 are welded together. do. The order of welding the pipe 10 and the flanges 11 and 12 may be either the flange 11 or the flange 12 first.

Alternatively, for example, before installing the pipe 10 in the pipe manufacturing apparatus 1, one end of the pipe 10 is inserted into the through hole of the flange 11, and the other end of the pipe 10 is inserted into the through hole of the flange 12. In this way, both ends of the pipe 10 are inserted into the through holes of the flanges 11 and 12, and this is installed in the pipe manufacturing apparatus 1 (mounted on the support roller 21 and the rotary drive unit 5), and the flange 11 and the flange 11 and the pipe 10 are mounted on the pipe 10. The flange 12 is welded and joined in the same manner.
Here, welding of the flange 11 and one end of the pipe 10 will be described as an example.

One end of the pipe 10 is inserted into the through hole at the center from the back side of the connection surface 11a of the flange 11, and is inserted, for example, to a position of about half the hole depth of the through hole of the flange 11. That is, the tip of one end of the pipe 10 is inserted so as not to protrude from the connection surface 11a of the flange 11.
The flange 11 into which one end of the pipe 10 is inserted is placed between the two support rollers 21 as described above, and the other end side (the side inserted into the flange 12) of the pipe 10 is the rotary drive unit 5. It is placed between the two drive rollers 22 of the above.
In the pipe manufacturing apparatus 1, when the pipe 10 is mounted, the rotation drive unit 5 starts operation by the control signal output from the control unit 7 (rotation control unit 16), and the drive roller 20 operates at an appropriate speed. Rotate. At this time, the flange 11 and the like rotate at the same rotation speed as the rotation-driven pipe 10.

For example, the outer welding machine 22 is brought close to the joint portion (outer welding portion 30) between the outer outer peripheral portion of the pipe 10 and the flange 11.
After that, the welding unit 6 starts operation by the control signal output from the control unit 7 (welding control unit 15), and for example, the outer welding machine 22 welds a current having a magnitude corresponding to the control signal. It is supplied from the power supply unit (not shown) of the unit 6 and starts welding the outer welded portion 30.
For example, the outer welding machine 22 is supplied with a current of about 600 [A] to perform plasma welding of the outer welding portion 30.
For example, the control unit 7 (welding control unit 15) controls the welding unit 6 (power supply unit), and the current supplied to the outer welding machine 22 according to the size and material of the pipe 10 and the flange 11 and the like. May be adjusted and a current of 600 [A] or more may be supplied so as to generate an appropriate molten pool.

At this time, the pipe 10 and the flange 11 are rotated together (at the same rotation speed), and an annular outer welded portion 30 (annular molten pool) is formed at the joint portion between the outer peripheral portion of the pipe 10 and the flange 11. Is generated, and welding is performed so as to go around the outer peripheral portion of the pipe 10.
Further, when welding the outer welded portion 30, the operation of the rotation drive unit 5 is controlled by the control signal output from the control unit 7 (rotation control unit 16), and the rotation speed of the pipe 10 or the like is set to an appropriate speed. By doing so, the welding speed is adjusted.

After welding around the outer circumference of the pipe 10 and the like, the welding portion 6 stops the welding operation of the outer welding machine 22 in response to the control signal output from the control unit 7 (welding control unit 15). In addition, the welding operation of the inner welding machine 23 is started.
Before the inner welding machine 23 starts welding, the inner welding machine 23 is brought close to a portion where the connection surface 11a of the flange 11 and the inner wall surface 10a of the hole of the pipe 10 are close to each other, that is, the inner welding portion 31.

When the welding unit 6 that has input the control signal from the control unit 7 (welding control unit 15) starts the welding operation of the inner welding machine 23, the inner welding machine 23 receives a current having a magnitude corresponding to the control signal. Is supplied from the power supply unit (not shown) of the welded unit 6.
For example, a current of about 300 [A] to 550 [A] is supplied to the inner welding machine 23 to perform plasma welding of the inner welding portion 31.
At this time, for example, the control unit 7 (welding control unit 15) controls the welding unit 6 (power supply unit) and supplies the welding unit 6 (power supply unit) to the inner welding machine 23 according to the size and material of the pipe 10 and the flange 11. Adjust the current to prevent excess molten pools, as described below.

When the inner welding machine 23 starts welding, the pipe 10 and the flange 11 are rotating together (at the same rotation speed). Therefore, an annular inner welded portion 31 (annular molten pool) is formed between the inner wall surface 10a of the hole and the connecting surface 11a, and the through hole provided at the tip of one end of the pipe 10 and the center of the flange 11 Welding is performed around the inside of the hole.
The inner welded portion 31 is welded so that the annular molten pool generated by the welding work does not protrude in the normal direction from the hole inner wall surface 10a and does not protrude in the normal direction from the connecting surface 11a.
Specifically, the control signal output from the control unit 7 (welding control unit 15) controls the magnitude of the current supplied from the power supply unit of the welding unit 6 to the inner welding machine 23 to control the inner welding machine. The welding temperature of 23 is adjusted to an appropriate level, and the inner welded portion 31 is welded in an annular shape (uniformly) so that the molten pool does not protrude from the hole inner wall surface 10a or the connecting surface 11a.
Although the operation of welding the inner welded portion 31 after welding the outer welded portion 30 has been described here, the order of welding the inner welded portions 31 is not limited to the order described above.

The distance from the central axis of the pipe hole of the pipe 10 to the inner wall surface 10a of the pipe (inner welded portion 31) and the distance from the central shaft to the outer peripheral wall of the pipe 10 (outer welded portion 30) are slightly different.
Therefore, when the rotation speed of the pipe 10 when welding the inner welded portion 31 and the rotation speed of the pipe 10 when welding the outer welded portion 30 are the same, the welding speed of the inner welded portion 31 The welding speed of the outer welded portion 30 is faster than that of the above.
Further, the size of the molten pool generated when the inner welded portion 31 is welded is limited, and the molten pool generated when the outer welded portion 30 is welded needs to have sufficient strength after solidification. That is, the appropriate size of the molten pool is different at each welded part.

Therefore, when the outer welding portion 30 is welded, the control unit 7 associates the current (discharge strength) supplied to the outer welding machine 22 with the rotation speed (welding speed) of the pipe 10 to drive the rotation drive unit. When 5 and the welded portion 6 are controlled and the inner welded portion 31 is welded, the current (discharge strength) supplied to the inner welder 23 is associated with the rotation speed (welding speed) of the pipe 10. The rotary drive unit 5 and the welded unit 6 are controlled.
Further, the control unit 7 controls each part when welding the outer welded portion 30 and each part when welding the inner welded portion 31 with different control contents. That is, each of the above parts is controlled by adjusting to an appropriate control content according to each welded portion, or by switching and selecting an appropriate control content from the preset control contents.

As described above, according to the present embodiment, the outer peripheral portion of the pipe 10 and the joint portion such as the flange 11 are welded, and the portion between the inner wall surface 10a of the hole of the pipe 10 and the connection surface 11a of the flange 11. By welding and welding two places for convenience, the pipe 10 and the flange 11 and the like can be joined with sufficient strength.
Further, since welding is also performed between the inner wall surface 10a of the hole and the connecting surface 11a, the size of the welded portion (outer welded portion 30) on the outer periphery of the pipe 10 can be suppressed, and the pipe 10 and the flange 11 or the like can be suppressed. It becomes possible to improve the appearance of the joint portion with.

1 Piping manufacturing equipment 2 Base 3 Machine frame 4 Machine frame 5 Rotation drive part 6 Welding part 7 Control part 8 Guide rail 10 Piping 10a Hole inner wall surface 11 Flange 11a Connection surface 12 Flange 13 Drive mechanism part 14 Encoder 15 Welding control part 16 Rotation control unit 20 Drive roller 21 Support roller 22 Outer welding machine 23 Inner welding machine 30 Outer welding part 31 Inner welding part

Claims (3)

A support part that supports the flange and
A rotary drive unit that rotates a pipe inserted into a through hole provided in the center of the connection surface from the back side of the connection surface of the flange.
A welded portion for welding the end of the pipe inserted into the through hole and the flange,
A control unit that controls the operation of the rotation drive unit and the operation of the welded unit, and
With
The welded part
An outer welder that welds the outer circumference of the end of the pipe to the back side of the flange.
An inner welder that welds the inner wall surface of the hole at the end of the pipe to the portion of the flange on the connection surface side.
With
The control unit
By controlling the rotation drive unit to adjust the rotation speed of the pipe, the welding speeds of the outer welding machine and the inner welding machine are adjusted.
By controlling the welded portion, each current supplied to the outer welding machine and the inner welding machine is adjusted.
Weld the outer circumference of the end of the pipe and the back surface of the flange with a predetermined strength, and at the same time.
Welding is performed so that no excess molten pool is formed between the inner wall surface of the hole at the end of the pipe and the connecting surface of the flange.
A flanged piping manufacturing device. The control unit
The current supplied to the inner welding machine is adjusted so that the welding pond generated between the inner wall surface of the hole at the end of the pipe and the connecting surface of the flange does not protrude from both the inner wall surface of the hole and the connecting surface. do,
The flanged piping manufacturing apparatus according to claim 1. The control unit
When welding is performed by the outer welding machine, the rotation drive unit is controlled to rotate the pipe at a rotation speed at which an annular molten pool is formed along the outer periphery of the pipe.
When welding is performed by the inner welding machine, the rotation drive unit is controlled to rotate the pipe at a rotation speed at which an annular molten pool is formed along the inner wall of the hole of the pipe.
The flanged piping manufacturing apparatus according to claim 1 or 2.

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