JPH11291088A - Welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding equipment capable of promoting the automation and the labor saving of, for example, the straight butt welding, and achieving the welding excellent in quality without requiring any skill. SOLUTION: A work W to be butt-welded is fixed by a clamp. A welding truck 62 to be dove-tail fitted to a guide rail 64 along a straight part Wa to be butt welded is driven to advance by a driving means. A press roller 74 to be rolled on the butted part Wa before welding forward of and in the vicinity of a welding torch, in addition to a pre-treatment rotary brush 72 to clean the butted part Wa before the welding, a limit switch L3 to detect an end part and a hole part of the work W, and the welding torch 76 to weld the butted part Wa are arranged on the welding truck 62 opposite to the butted part Wa. When the butted part Wa is stepped, the butted part is pressed inward by the press roller 74 to straighten the stepped part, and welded by the welding torch 76 immediately thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus for performing butt welding along a longitudinal direction such as a straight line.

[0002]

2. Description of the Related Art Conventionally, when a door or other panel-shaped bent product made of iron, stainless steel, or the like is welded in a long linear range, a gap between butted portions or a tilt of a joint surface occurs. There was a problem that it was easy and required straightening work before welding. Automatic welding devices are also used from the viewpoint of saving labor and automating such linear welding. Further, when fixing such a work to be welded on a support table, an operator needs to move a considerably heavy work and position it at a correct position.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a welding device which corrects misalignment and inclination of a butt portion in a longitudinal butt welding such as a straight line and can easily position a work. is there.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, a welding apparatus according to the present invention is a welding apparatus for performing butt welding along a longitudinal butt portion of a work. Fixing means for fixing a workpiece in a butt state before welding, a bogie main body driven and driven by a driving means, a welding head supported by the bogie main body to weld a butt portion of a work, and a bogie main body of the welding head The welding bogie is supported near the side of the traveling direction of the welding bogie, and has a pressing roller for pressing the butt portion before welding while rolling to correct the butt portion, and is disposed along the butt portion of the work, and the running of the welding bogie is carried out. And a carriage guide means for guiding the vehicle.

As described above, the pressing roller is provided on the welding carriage to press the butt portion before rolling while rolling, thereby correcting the butt portion, and the correcting action immediately after the pressing state by the pressing roller works. By performing butt welding while the butt welding is being performed, high-quality butt welding can be advanced while the butt joint correction work is automatically performed by the welding device, achieving automatic, labor-saving, and high-quality welding. Is done. The correction position by the pressing roller moves with the progress of the welding cart, but once welding has been performed immediately after the pressing roller, correction is no longer necessary. No problem. In particular, a bent product of a stainless steel plate often requires correction, and the effect of automation is great. In addition, if the straightening work is insufficient in the manual work, welding may be performed while leaving a step due to a discrepancy in the butt portion,
Although a problem in appearance such that the butted portion after welding is wavy is likely to occur, the welding apparatus of the present invention does not have such a problem because the pressing head uniformly corrects it immediately before welding by the welding head.

A welding apparatus for performing butt welding along a longitudinal butt portion of a work includes a first mounting portion for supporting the work, and a higher position and a lower position with respect to the first mounting portion. A second mounting portion that can move up and down relatively to support the work in a slidable state, and a lifting device that raises and lowers the second mounting portion relative to the first mounting portion The work is supported by the first placement part when the second placement part is at a lower position than the first placement part, and the second placement part is provided with the first placement part. When the workpiece is at a position higher than the work supporting portion, the work supporting base for supporting the work on the second mounting portion and the work provided near the work supporting base and slidably supported on the second mounting portion are welded to each other. The workpiece is positioned at the welding position, and the second mounting portion is the first mounting position. The workpiece is clamped to the first mounting portion while the workpiece in the positioning state is supported by the first mounting portion while being relatively lowered with respect to the workpiece, and the workpiece is fixed in a butted state before welding. A welding carriage having a workpiece fixing means, a bogie main body driven and driven by the driving means, a welding head supported by the bogie main body and welding a butted portion of the work, and a welding bogie arranged along the butted portion of the work Trolley guide means for guiding the traveling of the vehicle.

[0007] As described above, the work supporting base for supporting the work at the time of welding includes the first mounting portion for fixedly supporting the work and the second mounting portion for slidably supporting the work. If the work is moved on the work support base, the second mounting part is higher than the first mounting part and can be easily moved in a sliding state. On the other hand, in the fixed state at the time of welding, the fixing is stable. For this purpose, the second mounting portion can be made lower than the first mounting portion to be in a non-sliding state. As a result, the work can be set efficiently, and the work can be stabilized during welding.

Further, if the second mounting portion of the work supporting table is a ball supported so as to be able to move up and down and roll in the first mounting portion, the work can be slid in any of the front, rear, right and left directions. Therefore, the work can be slid to the desired position.

[0009]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a right side view of a welding apparatus according to an embodiment of the present invention. The welding apparatus 1 includes a base 2 having an upper surface forming a plane having a constant height from the floor, and a frame base 4 having a frame structure connected in front of the base 2 at substantially the same height. These form the basis of the device. Further, as shown in FIG. 2, a control device 6 of the present welding device 1 is independently installed on the floor on the right rear side of the base 2. In the following description, as shown in FIG.
Is defined as the front side, and the opposite side is defined as the rear side.

Here, the work W to be welded by the welding device 1
Has a longitudinal, for example, a straight, welded portion. However, the shape is not limited to a straight line, but may be a predetermined length, for example, a curved shape extending at a predetermined curvature as long as the shape is long. In the embodiment described below, welding of two stainless steel plate bent products or integrally bent products used for manufacturing a fire door as shown in FIG. 17A is taken as an example. Each stainless steel plate bent product is set up by setting up the four sides of the rectangular stainless steel plate at the same height at a predetermined height of 90 ° to form a panel with the same dimensions (flat box shape without lid). The workpiece W shown in FIG. 17A is formed by stacking the workpieces with their rising portions abutting each other. Alternatively, instead of overlapping two bent sheet products, a butt portion formed by folding one sheet material in the middle may be welded. The butting portion Wa is shown in FIG.
As shown in (b), it is linearly welded in a fixed state. In addition, in this welding apparatus 1, not only stainless steel materials but also processed products of iron materials and aluminum materials can be welded.

As shown in FIG. 1 and FIG.
On the plurality of horizontal upper frame members 4a constituting the upper part of the table, a partition-like work supporting leg 8 having a predetermined height is provided. A work support 10 as shown in FIGS. 4A and 4B is fixed to the upper end of each work support leg 8, and the work W is welded to the entire work support 10 during welding. It is placed horizontally so as to straddle it. 5 (a) and 5 (b), the upper surface 16a of the fixed housing 16 having a rectangular parallelepiped outer shape constitutes a first mounting portion. Has an air acting portion 12 continuous in the longitudinal direction, and a cylinder hole 14 formed at a predetermined pitch in the longitudinal direction and opened upward communicating with the air acting portion 12.
Each cylinder hole 14 has an ascending and descending elevating member 1
8 is fitted into the cylinder hole 14 in an airtight and slidable manner. Further, a ball (steel ball) 19 as a second mounting portion that can roll in an arbitrary direction of 360 ° is fitted in an upper portion of the elevating member 18. Further, as shown in FIG. 4B, an air supply pipe 20 for supplying air from the air supply device (FIG. 5) to the fixed housing 16 is connected to an end of the fixed housing 16.

As shown in FIG. 5 (a), when air is supplied to the air acting portion 12 in the fixed housing 16, each elevating member 18 receives pressure from below to ascend and rises, and It is in a state of being pressed against the end 24 in the vicinity.
At this time, the upper portion of the ball 19 protrudes from the opening 22 and lifts the work W. However, since the air is supplied to all the work support bases 10 at the same time, the work W is horizontally supported on each work support base 10, In addition, the ball 19 can be slid on the work support 10 using the rolling of the ball 19.
Therefore, even if the work W is a large panel, it can be easily moved to a desired position on the work support base 10.

On the other hand, as shown in FIG. 5 (b), when air is sucked to the outside and the inside of the fixed housing 16 is in a negative pressure state, the lifting member 18 descends by its own weight and negative pressure, and the opening of the fixed housing 16 is opened. Ball 19 protruding from 22
Is retracted downward from the opening 22 together with the elevating member 18. As a result, the work W supported by the ball 19 descends to the upper surface 16a of the fixed housing 16.
Since a normal frictional force acts between the work W and the upper surface 16a of the fixed housing 16, the work W is supported on the work support 10 without slipping.

Returning to FIG. 1, a gate-shaped body frame 32 that is long in the lateral direction is provided upright toward the front of the upper surface of the base 2. The main body frame 32 includes side frames 34 on both sides and an upper frame 36 connecting the side frames 34. Below the upper frame 36, a plurality of block bases 38 for receiving a pressing force of a clamp 58 described later are fixedly arranged between the side frames 34 on both sides. Then, a plate-shaped clamp receiving base 40 is attached to the upper surfaces of the plurality of block bases 38. The upper surface of the clamp receiver 40 is adjusted to substantially the same height as the upper surface 16 a of the fixed housing 16 of the work support 10, and the work W pressed by the clamp 58 is moved between the clamp receiver 40 and the work support 10. It is supported almost horizontally.

As shown in FIG. 2, positioning stoppers 42, 42 for positioning the work W in the front-rear direction on the work support 10 are provided on the upper surface of the clamp receiving base 40.
And a positioning stopper 44 for positioning in the lateral direction is provided to protrude upward. The work W is easily guided to a predetermined position by being slid on the work support table 10 as described above and hitting the three stoppers 42, 42, 44. Further, as shown in FIGS. 2 and 3, the light transmitter 48 and the light receiver 50 of the photoelectric sensor 46 are horizontally mounted at the front side of both the side frames 34 and at substantially the same height as the work W. I have. Then, the work W is placed between them, and the light from the light projector 48 is blocked.
It is detected that there is a work W above.

As shown in FIG. 1, the upper frame 36 includes
Three air cylinders 52 and two guide bushes 54
Is attached. A piston rod 56 and a guide bush 54 of each air cylinder 52 penetrate the upper frame 36, and a horizontally long rod-shaped clamp 58 as a work fixing means is horizontally fixed to a tip end thereof by a screw fastening means or the like. The clamp 58 fixes the work W from before welding to after welding to prevent the movement of the work W and keeps cooling after welding. In the case of butt welding, the butt portion (W
It serves to reduce the gap of a). This clamp 5
The air cylinder 8 descends while being guided by the guide shaft 57 and the guide bush 54 when air is supplied to each air cylinder 52 from an air supply device (not shown) and the respective piston rods 56 extend. Then, the work W located below is clamped and fixed by the clamp receiving base 40. Note that the lowering operation of the clamp 58 is performed by the operator pressing the clamp operation button after the positioning of the work W is completed.

Next, as shown in FIG. 2, a welding carriage 62 is provided on the upper surface of the base 2 and a guide rail 64 as a carriage guiding means on which the welding carriage 62 travels is laid. The laying direction of the guide rail 64 depends on the clamp 5
8 and thus parallel to the linear welding line of the workpiece W,
The inner rail is located almost directly below the welding surface of the workpiece W positioned by the stoppers 42,42.

As shown in FIG. 6, each of the rails 64 has an intermediate portion on both sides which is recessed inward and has a cross-sectional shape for a groove. On the other hand, on the bottom surface of the welding carriage 62 guided by the guide rail 64, a total of two pairs of groove members 63 are mounted, one pair in front and rear. A dovetail groove having a shape corresponding to the shape of the guide rail 64 is formed on the bottom surface of the dovetail groove member 63, and this is fitted into the guide rail 64, so that the welding carriage 62 can slide and run on the guide rail 64 without being pulled out. It is said. Further, even when a lateral force is applied, the welding cart 62 does not easily float up or out of the guide rail 64.

The welding carriage 62 moves by receiving the driving force of a motor 66 (FIGS. 7 and 8) disposed below the base 2. A reduction gear 67 is connected to a rotation shaft (not shown) of the motor 66, and a rotation shaft of the reduction gear 67 and a rotation shaft of the electromagnetic clutch / brake device 69 are connected by a belt 67a. Further, a chain 70 is hung between the sprocket 68a of the rotating shaft of the electromagnetic clutch / brake device 69 and the upper sprocket 68b, and the sprocket 68b
Can rotate integrally and coaxially with another sprocket 68c by a shaft 68g fixed to the base 2.

A chain 73 is hung between the sprocket 68c and the sprocket 68f at the end in the welding direction as shown in FIG. 9, and both ends of the chain 73 are fixed to the welding carriage 62. More specifically, as shown in FIG. 8, both sides of the chain 73 are connected to a connecting member 71 extending downward from the bottom side of the welding cart 62. Therefore, when the reduction gear 67, the electromagnetic clutch / brake 69, and the sprocket 68 b are rotated by the drive of the motor 66, the welding cart 62 moves along the guide rail 64 via the chain 73. The sprockets 68d and 68e are attached to prevent the chains 70 and 73 from hanging.

The starting and stopping of the traveling of the welding cart 62 is performed by operating the electromagnetic clutch / brake device 69. As shown in FIG. 2 and FIG. 9, limit switches L1 and L2 for detecting the arrival of the welding carriage 62 at the end of the guide rail 64 are provided slightly inside both ends of the guide rail 64, respectively.
The electromagnetic clutch / brake device 69 is operated by the operation of these limit switches L1 and L2, and the traveling of the welding carriage 62 is stopped.

As shown in FIGS. 10 and 11, on the upper surface of the welding carriage 62, in order from the front in the traveling direction of the welding carriage 62,
A pre-processing rotary brush 72, a detection roller 90 for a limit switch L3, a pressing roller 74, a welding torch 76 as a welding head, and a post-processing grinding roller 78 are arranged side by side. All of them are adjusted so that their tips are at the same height as the welding line, and the tips are arranged substantially on the same horizontal distance from the welding line.

First, the pretreatment rotating brush 72 positioned at the front end is rotated by the motor 83 while rotating the workpiece W before welding.
Rubbing the surface of the abutting portion Wa to remove attached dust and the like. As shown in FIG. 11, a support 80 is fixed on the welding carriage 62, and a support frame 77 is mounted on the support 80 in a direction perpendicular to the support 80.
a (FIG. 11) so as to be rotatable. The support frame 77 is divided into two parts, and is fixed by, for example, bolts and nuts with the brush holder 72a sandwiched therebetween.

An arm 81 is attached to the support frame 77, a spring mounting shaft 82 fixed to the support base 80 penetrates the arm 81 loosely, and a nut 82a as a stopper is screwed into a threaded portion at the tip. ing. Then, the compression spring 84 mounted between the support base 80 and the arm 81 presses the rotating brush 72 against the butt welding portion Wa. By changing the tightening position of the nut 82a (position change of the stopper), the rotation is stopped. The position of the brush 72 with respect to the workpiece W can be adjusted.

Next, the limit switch L3 is provided with a detection shaft member 88 which is a movable member, a main body portion 86 which slidably supports the detection shaft member 88, an ON-OFF contact portion 88a, and a rotatable end of the shaft member 88. It has a detection roller 90 attached and rotatable along the butting portion Wa. The main body 86 is fixed to a support 87 fixed to the welding carriage 62, and a shaft member 88.
Is urged against the main body 86 by a compression spring 89 in the protruding direction. When the detection roller 90 contacts the workpiece W,
The shaft member 88 compresses the compression spring 89 more, and
6, and closes the contact portion 88a (hereinafter referred to as ON state). Conversely, when not in contact with the workpiece W,
The shaft member 88 extends from the inside of the main body portion 86 to form a contact portion 88a.
(Hereinafter referred to as OFF state). As described above, the presence of the work W in front of the welding torch 76 can be detected by the expansion and contraction of the shaft member 88. Then, when the welding cart 62 starts running and the detection roller 90 of the limit switch L3 rides on the end of the work W, or when the welding cart 62 reaches the end on the opposite side of the work W and is in contact with the work W. When the detected detection roller 90 comes off the work W, the end position of the work W is detected.

Further, when there is a hole, such as a long hole 92 for key attachment, at which welding is to be stopped as shown in FIG. . The operation is shown in FIG. 12 (b), and the detection roller 90 abuts against the butting portion Wa and moves forward while rotating.
() Is inserted into the long hole 92 to be in an OFF state (), welding is stopped while the traveling of the welding carriage 62 is kept as it is, and then, when the vehicle runs on the butt portion Wa after passing through the long hole 92, the state becomes ON (). , Resume welding. As a result, as shown in FIG. 12C, the arc is temporarily stopped in the range of the long hole 92 while welding the front and rear of the long hole 92.

Next, as shown in FIGS. 10 and 11, the pressing roller 74 is located immediately before the welding torch 76, and the butting portion Wa of the upper and lower joints of the workpiece W shown in FIG.
13B, when the corners of the work W shown in FIG. 13B are not sufficiently bent and the butted portion Wa is bulged outward, the butted portion Wa is pressed inward to correct it. Things.

Returning to FIG. 10, the pressing roller 74 is formed of, for example, a steel material, is supported by the tip of an L-shaped roller support member 94, and rotates along the abutting portion Wa. A pressing roller 74 is rotatably supported in a horizontal plane by a vertical shaft 74 a at an end of a portion of the L-shaped roller supporting member 94 substantially parallel to the axial direction of the welding torch 76, and an outer peripheral surface of the pressing roller 74. Are very close to each other via a slight gap with a tapered outer peripheral surface 76a formed at the tip of the welding torch 76. A portion of the L-shaped roller support member 94 that is substantially perpendicular to the welding torch 76 extends substantially parallel to the welding line (butting portion Wa) away from the welding torch 76, and a shaft hole 9 formed in that portion.
Guide shafts 95 and 97 slidably pass through 4a and 94b, respectively, and are supported by a mounting plate 91 whose position is fixed.
The roller support member 94 is formed by these guide shafts 95 and 97.
Is movable in a direction approaching / separating from the butting portion Wa of the work. A compression spring 95a is mounted on one of the guide shafts 95, and the roller support member 94 is moved forward, that is, the pressing roller 74 is moved to the butting portion Wa of the work.
Side, and the pressing roller 74 rolls while being pressed against the butting portion Wa of the work by the urging force of the compression spring 95a, and corrects it.

As described above, the pressing roller 74 is very close to the tapered outer peripheral surface 76a of the welding torch 76 and opposes it. Immediately before pressing roller 7
The pressing force of No. 4 can be applied to the butting portion Wa of the work, and the welding is performed immediately after the correction by the pressing force.

The welding torch 76 has an elongated cylindrical MI shape.
It is a torch for G welding, and a wire-like electrode passes through the center of its cross section. While discharging, for example, argon gas as an inert gas for shielding from the opening at the tip, arc heat is generated by a DC arc to weld the butt portion Wa of the work W.
The use of argon gas makes it possible to weld stainless steel plates that are difficult to use with carbon dioxide gas. The welding torch 76 is supported by a torch support member 98 fixed to the welding carriage 62 so as to sandwich the outer peripheral portion.
By turning the two adjustment knobs 99 and 100, the horizontal and height positions can be adjusted.

Finally, the post-processing grinding roller 78 is rotated by a drive motor (not shown), and finishes the welded portion by grinding and removing a raised portion or the like generated in the welded portion by welding of the welding torch 76. The supporting state is the same as that of the above-described pretreatment rotary brush 72, and therefore detailed description is omitted. In short, it is supported rotatably around the shaft 82 and the compression spring 8
4, the post-processing grinding roller 78 is moved to the butting portion Wa of the work.
And adjusts the tip position of the subsequent processing roller 78 with the adjusting screw 82a.

The pre-processing rotary brush 7 described above
2. Each device of the welding torch 76 and the post-processing grinding roller 78 is supplied with electric power and operates, but its electric wire is arranged at a position so as not to hinder the advance of the welding carriage 62. For example, FIG.
As shown in FIG. 3, the electric wire 1 is attached to a bar 105, both ends of which are supported by both edges of the base 2 and arranged in parallel with the guide rail 64.
07 in a spiral state. A connector 109 is attached to the end of the electric wire 107 opposite to the power supply side, and an electric wire 110 such as the pretreatment rotating brush 74 is connected to the connector 109. In this way, the electric wire 107 follows the bar while sliding on the outer surface of the bar with the forward and backward movement of the welding cart 62, so that the electric wire 107 and the welding cart 62 can be prevented from interfering with each other.

Hereinafter, the operation of the welding apparatus 1 will be described with reference to FIGS.
This will be described based on the flowchart shown in FIG. First, a work W as shown in FIG. 17A is placed on the work support table 10, for example. Then, the work support table 10 (FIG. 2)
5), the ball 19 is projected by supplying air to the elevating member 18 at the ascending position, and the three positioning stoppers 42, 42,
44 (FIG. 2) for positioning (S1). Next, a clamp down switch (not shown) is pressed to
(FIG. 1) is lowered, and the work W is pressed against the clamp 58 and the receiving base 40 to be fixed. Here, the photoelectric sensor 46
(FIG. 2) detects the presence or absence of the work W, so that if the clamp lowering switch is pressed without setting the work W at the predetermined position, the clamp 58 does not lower for safety reasons (S2 to S4). .

Next, the operation switch of the welding carriage 62 is pressed to rotate the motor 66 in the forward direction and the traveling of the welding carriage 62 is started. However, if the welding carriage operation switch is pressed without fixing the workpiece W with the clamp 58, the welding carriage is pressed. 62 does not run (S5 to S7). Although the traveling speed of the welding bogie 62 is adjusted by the speed reducer 67, the traveling speed can be changed by changing the setting. Therefore, appropriate welding according to the thickness and material of the work W can be performed.

The welding cart 62 moves forward, the detection roller 90 of the limit switch L3 on the welding cart 62 rides on the end of the workpiece W, and the limit switch L3 is turned off from the OFF state.
When the state is switched to the N state, driving of each roller of the pre-processing rotary brush and the post-processing grinding roller based on the signal change,
The energization of the welding torch and the supply of the inert gas to the welding torch are started, and welding is started (S8-S9). It should be noted that a timer may be incorporated in the control device 6, and a predetermined time difference may be provided between the time when the end of the work W is detected by the limit switch L3 and the above-described time to adjust the welding start position. The same applies to a position where welding is once stopped and then restarted, and a welding end position, which will be described below.

The welding bogie 62 which has started welding advances as it is, and continuously performs butt welding on the linear butt portion Wa. That is, as shown in FIG.
In the clamped state shown in FIG. 7A, the surfaces of the butting parts Wa are cleaned by the pretreatment rotating brush 72 (FIG. 7B), and then displaced by the pressing roller 74 that follows the butting part Wa. Are pressed inward and corrected (FIGS. (C) and (d)), and immediately thereafter, they are welded by the welding torch 76 (FIGS. (E) and (f)). Further, the post-processing grinding roller 78 is finished by shaving off the ridges and the like generated by welding (FIGS. (G) and (h)).

As described above, the welding carriage 62 continuously welds the linear butting portion Wa. If there is a long hole in the middle of the welding, the detection roller 90 of the limit switch L3 is turned on. It falls into a long hole and turns off from the ON state
Change to a state. Based on the signal change, the energization of the pre-rotating brush and the post-processing grinding roller, the welding torch, and the gas supply of the welding torch are stopped (S10, S11). The welding trolley 62 moves forward as it is,
When the detection roller 90 of the limit switch L3 rides on the butting portion Wa again from the long hole and the limit switch L3 returns to the ON state (S12), welding is resumed by energizing the welding torch 76 or the like (S9).

When the welding carriage 62 further advances and passes through the end of the work W, the limit switch L3 is extended and turned off, and the energization of the welding torch 76 is stopped (S1).
0, S11). The welding carriage 62 in the welding stopped state moves forward as it is. When the welding cart 62 comes into contact with the limit switch L2 installed at the end of the guide rail 64,
The motor 66 driving the welding cart 62 is stopped, and FIG.
As shown in S14 of No. 5, the welding cart 62 automatically stops running. If there is no long hole in the work W, S1
From 0, the process proceeds to S14 via YES in S10 '. S1
After 4, the clamp 58 automatically rises at the same time,
The operator removes the work W from the clamp position on the work support base 10 (S15, S16). Then, the photoelectric sensor 46 detects that there is no work W at the clamp position, and the motor 66 is driven to rotate in the reverse direction based on the signal, and the welding carriage 62 starts reversing in a welding stopped state (S17,
S18). At this time, the traveling speed is set to be higher than that at the time of forward movement, and the return time to the forward movement start position (original position) is reduced. The backward traveling welding carriage 62 abuts against the limit switch L1 installed near the forward start position to stop the backward traveling, and the return is completed (S19 to S20).

As described above, the welding apparatus using MIG welding has been described as an embodiment of the present invention. However, the welding apparatus according to the present invention is not limited to such MIG welding. And widely includes a welding device for performing welding along a linear welding line of the work W by listing a welding head. Further, the welding apparatus of the present invention is intended for longitudinal welding, but is not limited to continuous long welding. Tap welding for performing longitudinal welding intermittently by controlling ON / OFF of the current supply to the welding head. Also applies to For example, it is used for temporary fixing welding. Further, the traveling guide means for guiding the traveling of the welding bogie may be configured so that the convex shaped portion of the welding bogie is fitted into a guide rail formed on the base base and formed with a groove, for example. In addition, it goes without saying that the present invention can be implemented in various modes based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front view showing a welding apparatus according to one embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a right side view thereof.

FIG. 4 is an explanatory view showing a work support base.

FIG. 5 is an explanatory diagram of the operation.

FIG. 6 is a diagram showing a joint state between a guide rail and a welding cart.

FIG. 7 is a side view showing a driving unit of the welding cart.

FIG. 8 is a rear view thereof.

FIG. 9 is a schematic diagram illustrating a traveling mechanism of the welding cart.

FIG. 10 is a plan view showing an arrangement state of each unit on a welding cart.

FIG. 11 is a front view thereof.

FIG. 12 is a view for explaining the operation of the long hole of the limit switch on the welding bogie.

FIG. 13 is a view exemplifying a failure state of a butting portion of a work.

FIG. 14 is a flowchart showing a flow of control of the welding device of FIG. 1;

FIG. 15 is a flowchart following FIG. 14;

FIG. 16 is a view for sequentially explaining the action of the welding device of FIG. 1 on the butted portion of the work.

FIG. 17 is an explanatory view illustrating an example of a work to be welded by the welding device of FIG. 1 and a welding location thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding apparatus 10 Work support base 16 Fixed housing 16a Upper surface of fixed housing (first mounting table) 18 Lifting member 19 Ball (second mounting table) 42, 44 Positioning stopper 58 Clamp (work fixing means) 62 Welding cart 64 Guide Rail (trolley guide means) 72 Pretreatment rotating brush 74 Pressing roller 76 Welding torch 78 Posttreatment grinding roller W Work Wa Butt joint

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[Procedure amendment]

[Submission date] March 9, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Claim 5

[Correction method] Change

[Correction contents]

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, a welding apparatus according to the present invention is a welding apparatus for performing butt welding along a longitudinal butt portion of a work. Work fixing means for fixing the work in a butt state before welding; a bogie main body driven and driven by a driving means; a welding head supported by the bogie main body for welding the butted portion of the work ; In the direction of travel
At the position immediately before the welding head.
Integrated with the welding head by the bogie body and
Moved slightly ahead of it, butch before welding
It is pressed against the
Immediately after the joint is straightened
Of the part where the straightening action is working on the welding torch
Welding bogie having a pressing roller for performing butt welding
And a bogie guide means arranged along the butting portion of the work and guiding the traveling of the welding bogie.

Claims (5)

[Claims] 1. A welding apparatus for performing butt welding along a longitudinal butt portion of a work, a work fixing means for fixing the work in a butt state before welding, and a bogie driven and driven by a driving means. A main body, a welding head supported by the bogie main body and welding the butted portion of the work;
A welding trolley supported by the welding head near the front side in the traveling direction of the bogie main body and having a pressing roller for pressing the butt portion before welding while rolling to correct the butt portion; And a bogie guide means arranged along the section for guiding the traveling of the welding bogie. 2. A welding device for performing butt welding along a longitudinal butt portion of a work, wherein the first mounting portion supports the work and a position higher than the first mounting portion. And a second mounting portion that can move up and down relatively to a low position and support the work in a slidable state, and move the second mounting portion up and down relatively to the first mounting portion. An elevating device for moving the workpiece, wherein when the second placement portion is at a lower position than the first placement portion, the work is supported by the first placement portion, and the second placement portion is supported. The part is the first
A work supporting table that supports the work with the second mounting section when the work supporting section is at a position higher than the mounting section; and a work supporting table that is provided near the work supporting table and is slidable with the second mounting section. A positioning stopper for positioning the work supported on the welding position at a fixed position for welding; the work is positioned at the welding position; and the second mounting portion is lowered relative to the first mounting portion. A work fixing means for clamping the work to the first mounting part and fixing the work in a butted state before welding in a state where the work in the positioning state is supported by the first mounting part; A welding bogie having a bogie main body driven and driven by means, a welding head supported by the bogie main body and welding the butting portion of the work, and a welding bogie arranged along the butting portion of the work; Guide the running of Welding apparatus characterized by comprising: a car guide means. 3. A welding device for performing butt welding along a longitudinal butt portion of a work, wherein the first mounting portion supports the work and a position higher than the first mounting portion. And a second mounting portion that can move up and down relatively to a low position and support the work in a slidable state, and move the second mounting portion up and down relatively to the first mounting portion. An elevating device for moving the workpiece, wherein when the second placement portion is at a lower position than the first placement portion, the work is supported by the first placement portion, and the second placement portion is supported. The part is the first
A work supporting table that supports the work with the second mounting section when the work supporting section is at a position higher than the mounting section; and a work supporting table that is provided near the work supporting table and is slidable with the second mounting section. A positioning stopper for positioning the work supported on the welding position at a fixed position for welding; the work is positioned at the welding position; and the second mounting portion is lowered relative to the first mounting portion. Work fixing means for clamping the work to the first mounting part and fixing the work in a butted state before welding in a state where the work in the positioned state is supported by the first mounting part, and driving means A bogie main body driven and driven by the bogie main body, a welding head supported by the bogie main body to weld the butted portion of the work, and a welding head supported near a front side of the bogie main body in the traveling direction of the bogie main body, before welding Do not roll the butted part of A welding carriage having a pressing roller that presses the welding part to correct the butting part, and a bogie guiding means that is arranged along the butting part of the work and guides the traveling of the welding carriage. Welding equipment. 4. A rotary brush is provided on the welding cart in front of the pressing roller in the traveling direction and rubs and cleans a butted portion of a workpiece before welding, and is provided on a rear side of the pressing roller. The welding device according to claim 1, further comprising a grinding roller that flattens a butt weld after welding. 5. The work supporting table according to claim 2, wherein the second mounting portion is a plurality of balls supported in the first mounting portion so as to be vertically movable and rollable. The welding device as described.