JPH1015665A - Automatic welding equipment for welding ring to cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a ring to be tack welded surely and easily at a prescribed position of a cylindrical body without using a tightening band, to perform automatically, surely and quickly the positioning of a welding starting position for a torch, and to correct the deformation of the cylindrical body so as to obtain the welding condition of a prescribed strength. SOLUTION: This equipment is provided with a ring clamp mechanism 54 which performs tack welding of a ring N attached to a pipe M, by pressurizing the ring inwardly in the radial direction with circumferentially plural ring pressurizing rollers 42, 43, 53; pipe straightening mechanism 33 which corrects the deformation of the pipe M by pressurizing from inside the pipe outwardly in the radial direction; and a sensor 31 which detects the welding starting position of a torch 2A, 2B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically welding a ring to a cylindrical body, which is applied, for example, when automatically fixing a detachment preventing ring to an outer peripheral surface of an insertion portion of a ductile cast pipe. It is.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for automatically welding a ring for preventing detachment to an outer peripheral surface of an insertion portion of a ductile cast pipe (pipe), for example, as shown in FIG. 11, a pipe M is connected to a pair of turning rollers 101, 101. After being carried into the upper portion, the operator attaches the ring N to the outer peripheral surface of the insertion portion of the pipe M, as shown in FIG. 12, the metal N is wound around the outer peripheral surface of the ring N. The band W is temporarily fastened to the pipe M by tightening, and in this state, the pipe M is rotated via the turning rollers 101, 101, so that the torch 102 has the missing circular portion of the ring N determined as the welding start position. After setting at a predetermined target position toward Na, the turning roller 10
It is known that the pipe M is continuously rotated through the bases 1 and 101, and at the same time, the ring N is welded to the outer peripheral surface of the pipe M by the torch 102 by arc start.

[0003]

In the conventional automatic ring welding apparatus for pipes having the above-described structure, after attaching the ring N to the pipe M, an operator tightens the band W to temporarily fix the ring N. In addition to putting a large work load on the operator, even after the ring N is temporarily fixed, the torch 102 is searched while rotating the pipe M to find the missing circular portion Na of the ring N which is the welding start position. Has to be set at a target position toward the above-mentioned missing portion Na.

The pipe M is often deformed into an elliptical shape as the diameter thereof increases.
When welding is performed while rotating the torch 102 with the turning rollers 101, the distance between the torch 102 and the welding point varies over the entire circumference of the pipe M. As a result, the ring N cannot be welded uniformly over the entire circumference. However, there is a problem that the ring N cannot be fixed by welding to a predetermined strength. The present invention has been made in view of the above circumstances, and can securely and easily temporarily fix a ring to a predetermined position on an outer peripheral surface of a pipe without using a tightening band with a large work load, and automatically positions a torch. The present invention provides an automatic ring welding apparatus for a pipe, which can be easily and quickly performed, and even when the pipe is deformed, can be welded almost uniformly over the entire circumference and fixed at a predetermined strength. The purpose is.

[0005]

According to a first aspect of the present invention, there is provided an automatic ring welding apparatus for a cylindrical body according to the present invention. An automatic ring welding device for a cylinder for welding and fixing a ring mounted at a predetermined position to a cylinder by using a torch capable of controlling a plurality of axes of a ring as a welding start position. A ring clamp mechanism for temporarily fixing the mounted ring by pressing it radially inward by a plurality of ring pressing rollers in the circumferential direction, and pressing the cylindrical body outward from the inside thereof to form the cylindrical body. And a sensor for detecting a missing circular portion of the ring as a welding start position when welding is started by the torch.

According to this configuration, the ring mounted at a predetermined position of the cylindrical body is pressed inward in the radial direction by a plurality of ring pressing rollers in the circumferential direction of the ring clamp mechanism, thereby winding the ring around the outer peripheral surface of the ring. The ring can be easily temporarily fixed to a predetermined position on the outer peripheral surface of the cylindrical body without using a troublesome and force-consuming tightening band such as tightening, thereby improving workability. In addition, after the ring is temporarily fixed, the missing circular portion of the ring is detected by the sensor, and the torch can be automatically and accurately positioned at the welding start position (missing circular portion) in accordance with the sensor. Can be performed efficiently. In addition, even if the cylindrical body is deformed into an elliptical shape, the cylindrical body correcting mechanism corrects the deformation by pressing the cylindrical body almost uniformly from the inside toward the radially outward side all around. It is possible to increase the roundness of the cylindrical body, thereby making it possible to substantially eliminate variations in the distance between the torch and the welding point over the entire circumference of the cylindrical body and to weld the ring almost uniformly over the entire circumference. Thus, it can be fixed to the cylindrical body with a predetermined strength.

Further, in the above automatic ring welding apparatus for a cylindrical body, as described in claim 2, a vibration is applied to the torch at a position near the torch by contacting the torch after welding to remove attached spatter. A vibrator-type spatter remover, a welding wire cutting mechanism, and a container containing an anti-spatter agent applied to the torch by the operation of the torch are arranged, so that spatter adhered to the torch during welding is provided. Is automatically removed to improve welding conditions, and it is possible to automatically apply a spatter inhibitor to the torch before welding to suppress the adhesion of spatter during welding. Not only is it possible to improve the welding accuracy of the ring to the cylinder with a large amount of generation, but also because there is little spatter adhesion from the beginning,
It enables continuous welding and improves the productivity of ring welded products.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an entire ring automatic welding apparatus for pipes according to the present invention.
Reference numeral 1 denotes an apparatus main body provided on the insertion port Ma side of the pipe M, and an insertion side and a receiver for welding a ring (FIG. 7) N mounted on the outer peripheral surface of the pipe M on the insertion port Ma side. Side has a pair of torches 2A, 2B. Reference numeral 3 denotes a receiving port support mechanism provided on the receiving port side of the pipe M, and a cylinder 5 for fitting the receiving port fitting 4 to the receiving port Mb, and a pipe via the receiving port fitting 4. A rotation drive device 6 for rotating M around its axis. 7, 7 is the pipe M
Is a pipe supporting portion for supporting the pipe from below. An installation base 11 such as a welding power source 8, a wire pack 9, and a cooling device 10 is fixed to the apparatus main body 1 side.

FIGS. 2 and 3 are a front view and a left side view of a main part (apparatus main body side) of the welding apparatus, respectively.
2 and 3, reference numeral 21 denotes a base which constitutes a part of the apparatus main body 1, and reference numeral 22 denotes a support standing upright on the rear end side of the base 21. An X-axis servo unit 23 for positioning the torches 2A and 2B in the left-right direction (X-axis direction) is provided at the upper end of the column 22.
On the axis servo unit 23, a Y-axis servo unit 24 for positioning the torches 2A, 2B in the front-rear direction (Y-axis direction) is provided. Further, a Z-axis servo unit 25 for positioning the torches 2A, 2B in the vertical direction (Z-axis direction) is provided at the tip of the Y-axis servo unit 24. Furthermore, on the front surface of the Z-axis servo unit 25, an X-axis servo unit for individual torch, that is, an X-axis servo unit for insertion torch 26A,
An X-axis servo unit for receiving torch 26B is provided.

[0010] The X-axis servo unit 26 for the insertion side torch.
The manual adjustment shafts 28A, 29A, and 30A in the X-axis, Y-axis, and Z-axis directions are provided on the support member 27A fixed to A.
The insertion side torch 2A is supported via the X-axis servo unit 26B for the receiving side torch, and a manual adjustment shaft 28B for each of the X-axis, Y-axis and Z-axis directions Receiver torch 2 via 29B, 30B
B is supported. Thus, the torch 2 is 6
The axis is configured to be servo-controllable.

The apparatus main body 1 is provided with a laser sensor 31 for detecting a missing circular portion Na of the ring N (FIG. 7), that is, a welding start position. Reference numeral 32 denotes a cylinder for positioning the laser sensor 31.

Reference numeral 33 denotes a pipe straightening mechanism which is installed on the apparatus main body 1 so as to face the opening Ma side of the pipe M. The straightening mechanism 33 is, for example, as shown in FIG. A hydraulic chuck (head portion) 34 having three chuck pieces 34A arranged equally around the center and capable of being displaced in the radial direction, and a cylinder 35 for opening and closing the hydraulic chuck 34; 3
4 with the hydraulic chuck 34 inserted into the pipe M.
Is displaced radially outward, and the pipe M
Is pressed so that the inner peripheral surface thereof is pressed almost uniformly over the entire circumference toward the radially outward side. The object of the correction mechanism 33 is not limited to a circular cylindrical body, but may be a square or elliptical cross section.

Reference numeral 36 denotes a guide rail 37 on the base 21.
The movable base is movably disposed in the left-right direction via a movable rod, and is connected to a piston rod 38a of a cylinder 38. On the movable base 36, as shown in FIGS. An upwardly directed guide cylinder 39 located radially downward of the ring N and a forwardly directed guide cylinder 41 located rearward in the radial direction of the ring N via a support leg 40 are provided. 42, 43 are the cylinders 39,
Each of the ring press rollers 42 and 43 has a ring-shaped inclined groove (FIG. 8) 42a, 43a. The ring N is positioned in the axial direction (width direction).

Reference numeral 44 denotes a shaft supporting member fixed to the front portion of the movable base 36 via a base 45. A shaft 46 supported by the shaft supporting member 44 has a shaft 46 as shown in FIGS. , The upper end of the drive lever 47 is connected and fixed.
Pin 4 is attached to the tip end of piston rod 48a of cylinder 48.
9 are pivotally connected. Reference numeral 50 denotes a lever having a lower end fixed to the shaft 46 corresponding to the ring N. On the upper end of the lever 50, a U-shaped roller support member 51 is pivotably pivoted via a pin 52. A pair of ring pressing rollers 53, 53 for supporting and clamping the ring N inward in the radial direction are attached to both ends of the support member 51.
The lever 50 is rotated counterclockwise by extending the piston rod 48a of the roller 53,5.
Each of the annular inclined grooves 53a (FIG. 8) positions the ring N in the axial direction. Cylinders 39 and 41, roller 4
2, 43, cylinder 48, lever 50 and roller 53
Thus, the ring clamp mechanism 54 is configured.

In the apparatus for automatically welding a ring to a pipe having the above-described structure, a pipe straightening mechanism is inserted into an opening Ma of the pipe M in a state where the pipe M conveyed to a predetermined position is supported by the pipe supporting portions 7,7. While the hydraulic chuck 34 in 33 is inserted, the socket fitting 4 is fitted to the socket Mb side of the pipe M, and in this state, the chuck piece 34A of the hydraulic chuck 34 is displaced radially outward. When the inner peripheral surface of the pipe M is pressed almost uniformly over the entire circumference toward the outside in the radial direction, even if the pipe M is deformed into an elliptical shape, this is corrected and the roundness is increased.

Next, a ring N is mounted on the outer peripheral surface of the pipe M on the side of the insertion opening Ma. At this time, by using the laser sensor 31, the ring N can be accurately positioned at a predetermined position in the axial direction. Can be positioned.

After the ring N is mounted on the pipe M, the movable base 36 is displaced in the left-right direction by the cylinder 38 to position the ring clamp mechanism 54 at a predetermined position. Then, while rotating the pipe M by the rotation driving device 6, the cylinders 39, 41 of the ring clamp mechanism 54 press the respective ring pressing rollers 42, 43 radially inward with respect to the ring N to clamp the ring N. On the other hand, a pair of ring pressing rollers 53, 53 are driven by a cylinder 48 via a driving lever 47 and a lever 50.
Is pressed against the ring N to be clamped. As a result, each inclined groove 4 of each of the ring pressing rollers 42 and 43 is
2a, 43a and a pair of ring pressing rollers 53, 5
The ring N is reliably positioned in the axial direction by the respective inclined grooves 53a. Accordingly, the ring N can be automatically temporarily fixed to the predetermined position without using the tightening band, and the work for the ring temporary fixing can be rationalized.

After the ring N is temporarily fixed, the laser sensor 31 detects the missing circular portion Na (FIG. 7) of the ring N, that is, the welding start position, while rotating the pipe M. By the detection signal from the laser sensor 31, the torches 2A and 2B are accurately positioned toward the welding start position.
By B, the ring N is welded to the pipe M,
Here, since the pipe M is deformed and given a high roundness, the distance between the torches 2A, 2B and the pipe M is kept constant with high accuracy over the entire circumference of the pipe M, A good welding condition can be obtained.

A gantry 61 fixed on the base 21 in the automatic ring welding apparatus for pipes as described above.
Is provided with a torch cleaning section 62 having a configuration as shown in FIGS.

9 and 10, reference numeral 63 denotes a vibrator type spatter remover having a manual adjustment shaft 64, and 65 denotes a wire cutting mechanism having a manual adjustment shaft 66, and a welding wire cutting cutter 68 driven by a cylinder 67. It has. Reference numeral 69 denotes a container containing an anti-sputtering agent. The torch cleaning operation in the torch cleaning section 62 having such a configuration is as follows.

That is, the torches 2A, 2B are brought into contact with the vibrator-type spatter remover 63 by driving the torches 2A, 2B after welding.
By applying vibration to B, spatters attached to the torches 2A, 2B can be dropped and removed. Wire cutting mechanism 6
By cutting and removing the welding wire by 5, mistakes at the time of arc start can be reduced. Furthermore,
By operating the torches 2A and 2B so as to be immersed in the anti-spatter agent in the container 69 before welding,
It is possible to apply a spatter preventing agent to the torches 2A and 2B to reduce in advance the spatter adhered at the next welding. Such a torch cleaning operation is preferably performed each time welding is performed, but a sufficient effect can be obtained even if performed every several times.

[0022]

As described above, according to the first aspect of the present invention, a ring mounted at a predetermined position of a cylindrical body is radially inwardly moved by a plurality of circumferential ring pressing rollers in a ring clamp mechanism. , The ring can be securely and easily temporarily fixed to a predetermined position on the outer peripheral surface of the cylinder, and it is troublesome and requires tightening such as winding and tightening on the outer peripheral surface of the ring as in the past. This eliminates the need for using a band, thereby improving the workability of temporarily fixing the ring and saving labor. In addition, after the ring is temporarily fixed, the torch can be automatically and accurately positioned at the welding start position (missing portion) by detecting the missing portion of the ring with a sensor, and the setup work until the welding starts Can be performed very efficiently. Moreover, even if the cylindrical body is deformed into an elliptical shape, the correcting mechanism presses the cylindrical body almost uniformly from the inside toward the radially outward side to correct the deformation and correct the roundness of the cylindrical body. Therefore, the distance between the torch and the welding point is kept almost constant over the entire circumference of the cylinder, and the ring is almost uniformly welded over the entire circumference and fixed to the cylinder at a predetermined strength. This has the effect that it can be performed.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the welding conditions are improved by automatically removing spatters attached to the torch during welding. In addition to this, it is possible to take measures such as suppressing the adhesion of spatter at the time of the next welding to the torch before welding. In addition to the improvement of the welding accuracy, the effect that the adhesion of spatter is originally reduced and the productivity of the ring welded product by the continuous welding can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of an entire apparatus for automatically welding a ring to a cylindrical body according to the present invention.

FIG. 2 is an enlarged front view of a main part of a device for automatically welding a ring to the upper cylindrical body.

FIG. 3 is an enlarged left side view of a main part of the automatic ring welding device for the upper cylindrical body.

FIG. 4 is an enlarged left side view of the ring clamp mechanism.

FIG. 5 is an enlarged front view of the same ring clamp mechanism.

FIG. 6 is an enlarged plan view of the ring clamp mechanism.

FIG. 7 is a side view showing how a laser sensor detects a missing circular portion of a ring.

FIG. 8 is a cross-sectional view showing a state where the ring pressing roller positions the ring.

FIG. 9 is a side view illustrating a configuration of a torch cleaning unit.

FIG. 10 is a plan view showing a configuration of a torch cleaning unit according to the third embodiment.

FIG. 11 is a side view showing an outline of a conventional apparatus for automatically welding a ring to a cylindrical body.

FIG. 12 is a cross-sectional view of a state in which the ring of FIG. 11 is temporarily fixed with a band.

[Explanation of symbols]

 2A, 2B Torch 31 Sensor 33 Pipe straightening mechanism 42, 43, 53 Ring press roller 54 Ring clamp mechanism M Pipe N ring Na Ring lacking part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B23K 9/23 B23K 9/23 D 37/047 502 37/047 502 37/053 37/053 D ( 72) Inventor Shigetoshi Asai 2-47 Shishitsu Higashi, Naniwa-ku, Osaka City, Osaka Prefecture Kubota Corporation

Claims (2)

[Claims] 1. A torch capable of controlling a plurality of axes of a ring mounted at a predetermined position on an outer peripheral surface of a cylindrical body rotatably supported about an axis, and using the missing circle portion of the ring as a welding start position to a cylindrical body. An automatic ring welding apparatus for welding and fixing to a cylindrical body, wherein a ring mounted on the cylindrical body is pressed radially inward by a plurality of circumferential ring pressing rollers to temporarily fix the ring. And a cylinder correcting mechanism for pressing the cylindrical body from the inside toward the outside to correct the deformation of the cylindrical body, and starting welding the missing circular portion of the ring when starting welding with the torch. An automatic ring welding device for a cylinder, comprising: a sensor for detecting a position. 2. A vibrator-type spatter remover that abuts on the torch after welding and applies vibration to the torch to remove attached spatter, a welding wire cutting mechanism, and a torch near the torch. The apparatus for automatically welding a ring to a cylindrical body according to claim 1, further comprising a container containing a spatter preventing agent applied to the torch.