JPH07124782A - Welding equipment for steel sheet - Google Patents

Abstract

PURPOSE:To rapidly and surely welding a member whose material is a stainless steel sheet without generating thermal deformation. CONSTITUTION:A fixed fitting frame body 28 provided with a clamping means 31 is provided on one side of a welding rack 27, a movable fitting frame body 29 provided with a clamping means 31 is provided on the other side of the welding rack in a movable state and mounting tables 35 and 35a provided with cooling receiving plates 30 and 30a in which cooling water is allowed to flow are horizontally and projectingly provided on both of fixed and movable fitting frame bodies 28 and 29. A material to be welded is engaged with and mounted on the mounting tables 35 and 35a and pressurized to contact with the mounting tables by the clamping means 31. In this state, heat inputted in the material to be welded during welding is well expulsed by allowing the cooling water to flow in the cooling receiving plates 30 and 30a and generation of thermal deformation on welding part of the material to be welded is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus for welding a steel sheet, which is capable of quickly and reliably welding a stainless steel sheet without causing thermal deformation after the welding.

[0002]

2. Description of the Related Art In recent years, a switch installed on a power distribution line to open and close an electric circuit includes an oil-filled switch filled with insulating oil, a gas switch filled with insulating gas, and
Alternatively, an air switch or the like adopting a simple air system is used. The switch, for example, the gas switch, has a schematic structure as shown in FIGS. 14 to 16. That is, in FIGS.
Is a case of the gas switch, 2 is a closing plate for fixedly closing one opening end of the case 1, and 3 is a cover body 3 detachably attached to the other opening. Reference numeral 4 denotes a partition wall that divides the inside of the case 1 by the cover body 3 side to divide the inside of the case 1 into a switching drive chamber 5 for switching electrodes and a drive mechanism housing chamber 6. As shown in FIG. 16, 7 and 7a are lead-out porcelain tubes which are horizontally attached to both side walls 1a of the case 1 and are provided with terminals 8 and 9 which are connected to an electric path at the tip of a through conductor (not shown).

Referring to FIG. 16, in the switching drive chamber 5, a movable electrode 10 connected to the input side porcelain tube 7 via a through conductor and a terminal 8 and an output side porcelain tube 7a attached to the movable electrode 10 are connected. The movable electrode 10 is provided with a fixed electrode 11 which comes in contact with each other in a separable manner.
2 is configured to reciprocate in the state of being able to come into contact with and separate from the fixed electrode 11 side to close or cut off the electric path. On the other hand, in the drive mechanism housing chamber 6, the drive arm 12
An unillustrated quick cut drive mechanism for driving the fast cut
It is housed and installed in a state in which it is drivingly connected to the electromagnet of the drive source. Furthermore, the switching drive chamber 5 is filled with an insulating gas (for example, SF ₆ gas or the like) at a constant concentration and pressure in a state where the power supply transformer 13 that supplies the drive power to the electromagnet (not shown) is accommodated. . Reference numeral 14 is a manual operation handle attached to the cover body 3 side, and 15 is an on / off pointer indicating the switching position of the gas switch provided on the closing plate 2 side.

[0004]

The case 1 of the gas switch in which the insulating gas is sealed has conventionally used a case made of an iron plate, so that the outer surface thereof has weather resistance and rust preventive effect. However, since the inner surface is filled with an insulating gas, rusting is unlikely to occur, so no special coating is applied.
Also, in the case of an oil-filled switch in which insulating oil is sealed, the case is coated in the same way as in the case of the gas switch, and the case itself is approximately There is a strong demand today to produce something that can withstand 30 years of use.

However, in the case of a switch in which an insulating medium such as gas is sealed inside, it is unlikely that the inner surface of the case will rust due to the presence of the insulating medium. If the coating film is damaged or peeled off due to collision or a jig, the part will rust and the rusted part will be corroded over the years, and in the worst case, a hole will be created and the insulating medium will leak out. There was a problem of doing. Therefore, recently, in view of the above point, although the cost is high, by changing the material from an iron plate to a stainless steel plate and using it, the rusting is suppressed. However, when the case of the switch is made of a stainless steel plate, the stainless steel plate generally has a poor thermal conductivity and a very large coefficient of linear expansion.
When welding the joined parts of the case of the formed stainless steel plate by welding, the welding heat is hidden in the periphery of the welding point, and this heat input causes a large thermal deformation on the plate surface around the welding point. After that, it was necessary to immediately and forcibly correct the heat-deformed portion with, for example, a press.

However, in the case of the switch,
For example, as shown in FIG. 16, when the side plate of the case to which each of the movable and fixed electrodes is attached is thermally distorted due to thermal deformation in the vicinity of the attaching part, the movable electrode and the fixed electrode are displaced from each other. As a result, there is a problem that the movable electrode cannot be closed, or the switching operation at the time of closing / closing is not smooth. Therefore, as described above, since it is necessary to correct the thermal strain using a press or the like after welding, it is very time-consuming and, after welding the switch case using the stainless steel plate, It is technically very difficult to correct the thermal strain itself so that the movable electrodes can be smoothly switched, and it is technically very difficult, as a result, as a result, it is difficult to correct the switch. Corrective work after welding the case was virtually impossible.

In view of the above-mentioned various problems, the present invention, when welding a joint portion of a case formed by forming a stainless steel plate, causes thermal distortion by appropriately cooling the welded portion. It is an object of the present invention to provide a steel plate welding apparatus that smoothly and satisfactorily welds a case joint.

[0008]

According to the present invention, there is provided one of a horizontally long welding pedestal, on both sides orthogonal to the longitudinal direction of the pedestal.
With a pair of fixed columns facing each other, a plurality of fixed columns are planted along the length direction of the gantry to form a fixed mounting frame, and the gantry exists between the pair of fixed columns facing each other. In the upper space, in order to mount and fit the case of the switch formed in the shape of a rectangular tube in a horizontally long state, only the base end is attached to the end of the fixed attachment frame body. The mounting base is extended horizontally, and on the front side of the fixed mounting frame, a pair of movable pillars are planted in the same manner as the fixed pillars on a carriage that moves on rails laid on the mounting base. , The movable mounting frame body is formed by providing the movable mounting frame body and the movable mounting frame body in the same horizontal position as the first mounting base on the fixed mounting frame body side. The second mounting base in the form of a short plate is attached to the end of the movable mounting frame.

At the center position in the width direction on the first and second mounting bases, the first and second narrow widths along the length direction of the mounting base.
Each of the cooling receiving plates is laid by arranging a water pipe for circulating cooling water inside the cooling receiving plates.On the other hand, at the upper ends of the fixed column and the movable column, a clamp head descends to the position of the cooling receiving plate. Clamping means set to be movable and driving operation of the clamping means via a piston rod,
For example, a welded object attaching device for mounting and fixing an object to be welded is provided, which is provided with a pneumatic cylinder device, and is provided with these clamp means, fixed and movable attachment frame bodies, first and second cooling receiving plates, and the like. To do.

[0010]

When a welding object formed by using a stainless steel plate is set in the welding object attaching device for welding work, that is, as a welding object, for example, a switch using a stainless steel plate for a distribution line is used. Molded for the case,
The case of welding the joint portion of this case will be described. In this case, a pair of vertically long case elements that are bent so that their longitudinal cross sections have a substantially U shape are formed by bending the ends of the bent portions. The flange portions are combined to form a rectangular tube-shaped case, and in this state, a partition wall that divides the case into two chambers is inserted at a fixed position in the rectangular tube-shaped case. Subsequently, the mutually overlapping flange portion of the case and the joint portion between the inner peripheral surface of the case and the partition wall are partially individually fixed by spot welding or the like, and temporarily fixed so that the appearance of the case is not destroyed. To do.

After temporarily fixing the case as described above,
When setting this case to the welding device, first move the movable mounting frame in the direction to separate it from the fixed mounting frame,
By utilizing the gap between the movable mounting frame and the fixed mounting frame, the rectangular tubular case is opened from one opening end thereof to the first mounting base on the fixed mounting frame side, and the opening edge of the case is formed. Is fitted to a position where it comes into contact with a stopper provided on the first mounting table, and the pair of flange portions forming the overlapping portion of the case are mounted on the first cooling receiving plate laid in the central portion of the mounting table.
After this, move the movable mounting frame to the fixed mounting frame side,
The second cooling receiving plate provided on the second mounting base of the movable mounting frame is fitted into the case from the other opening end side of the case,
The case is mounted on the first and second mounting bases of both fixed and movable mounting frames via the first and second cooling receiving plates.
Although the case has a partition wall inside, when the movable mounting frame body is moved to the fixed mounting frame side, the tip of the second mounting table of the movable mounting frame body has the partition wall. Immediately before colliding with, the opening edge of the case located on the side of the movable mounting frame comes into contact with a stopper provided on the second mounting base of the movable mounting frame, and the second mounting base collides with the partition wall. It is configured to prevent Next, a case pressing plate is applied to both sides of the flange portion of the case in parallel with the first and second cooling receiving plates. In this case, as the case pressing plate, a plate whose thickness is thinner than the height of the flange is used.

After the case is mounted on the first and second mounting bases, the pneumatic cylinder device is driven to rotate the clamp means from the upright state, and the clamp head is brought into contact with the case holding plate to press it. The plate surface adjacent to the flange portion of the case is firmly sandwiched between the case pressing plate and the first and second cooling receiving plates. After the case is fixed on the mounting table by the clamp means, cooling water is passed through the water pipes embedded in the first and second cooling receiving plates. In this state, for example, TI
By operating the G welding robot and running the welding head in parallel along the upper edge of the flange portion of the case, welding for joining the flange portions is performed. The heat input generated during welding of the flange portion is configured to be well absorbed by the cooling water circulating in the first and second cooling receiving plates and not to be hidden in the weld portion of the case. By welding the flange portion of, the problem that the plate surface around the flange portion is thermally deformed can be reliably solved. Also, when setting the case to the welding device, the method of fitting the square tubular case to the mounting table is adopted, and the case is prevented from falling off by moving the movable mounting frame to the fixed mounting frame side. Moreover, in this state, the case can be easily fixed by clamping the case with the clamp means, so that there is also an advantage that the welding work of the joint portion of the case can be performed quickly and easily.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is welded to a case used for a switch for opening and closing an electric circuit installed on a distribution line will be described below with reference to FIGS. FIG. 1 is a schematic view showing a welding device of the present invention.
Welding object mounting device 22 for setting case 21 of switch for welding, welding robot 23, control device 24 for controlling driving of welding robot 23, welding current supply device 25, and operation of control device 24 And box 26. Next, the structure of the welded object attaching device 22, which is a main part of the present invention, will be described with reference to FIGS.

In FIG. 2, the structure of the welded object attaching device 22 is roughly classified into a horizontally long welding mount 27 and a fixed mounting frame 28 installed at one end of the welding mount 27.
Similarly, a movable mounting frame 29 that moves back and forth on a rail a laid on the other end side of the welding base 27, and a copper that is linearly arranged at the central position of both the fixed and movable mounting frames 28, 29. Narrow and horizontally long first and second cooling receiving plates 30 and 30a (see FIG. 3) made of a material having excellent isothermal conductivity, and a plurality of plurality provided on the upper end edges of both the mounting frame bodies 28 and 29. The clamp means 31 and the pneumatic cylinder device 32 for driving and operating the clamp means 31.

As shown in FIGS. 2 and 5, the fixed mounting frame 28 has a pair of fixed columns 33, 33 made of angle steel or the like on one end of the welding base 27 on both sides of the base 27.
a are made to face each other, and moreover, a plurality (in this example, three rows, six lines) are planted along the length direction of the welding mount 27, and are arranged between the pair of fixed columns 33, 33a. In the existing space S on the welding mount 27 (see FIG. 3), as shown in FIGS. 3 and 5, the first mounting member whose base is fixed to the support column 34 which stands upright on the end of the welding mount 27 is provided. The gantry 35
Between the pair of fixed columns 33 and 33a, a fixed height is provided from the welding mount 27 and is horizontally projected toward the movable mounting frame 29 side. On the other hand, the movable mounting frame 29, as shown in FIG. 3, has a movable column 37 that is vertically (only one pair) upright (similar to the fixed columns 33, 33a) on a carriage 36 that can move forward and backward on a rail a via wheels b. , 37a and the movable columns 37, 37
As shown in FIG. 3 between the a and the first mounting base 35, the second mounting base 35a is horizontally attached to the support pillar 34a planted on the carriage 36 at a position on the same horizontal line as the first mounting base 35. When the second mounting base 35a is moved to the fixed mounting frame 28 side by the carriage 36 and reaches the fixed position, the tip of the second mounting base 35a is moved to the case 21 as shown in FIG. It is manufactured with a length that does not collide with the partition wall c.

Next, the first and second cooling receiving plates 30, 30a
The structure will be described with reference to FIGS. As shown in FIG. 5, the first cooling receiving plate 30 is arranged in the center of the first mounting table 35 in the width direction along the length direction of the mounting table 35. As shown in FIG. 9, a water pipe 38 is provided inside and is fixed to the first mounting base 35 by bolting or welding.
Further, the second cooling receiving plate 30a is the same as the first cooling receiving plate 30.
The extension line, which is on the same horizontal line as, is fixed to the second mounting base 35a by bolting or the like, and a water pipe 38a is also provided in the second cooling receiving plate 30a. Then, the first and second cooling receiving plates 30, 30
As shown in FIG. 9, a is formed in a bow shape with a slight curvature so as to apply reverse strain to the side plate around the welded portion of the case 21. Further, as shown in FIG. 11, the water flow pipes 38, 38a connected to the cooling receiving plates 30, 30a do not communicate with each other, one is for the cooling water supply source d, and the other is for the cooling receiving plate 30. , 30a is piped meandering to drainage e
Are in communication with each other.

Next, the clamp means 31 and the pneumatic cylinder device 32 for driving the clamp means 31 will be described. First, as shown in FIG. 2, the clamping means 31 is provided on the fixed pillars 33, 33a and the movable pillars 37, 37a constituting the fixed mount frame 28 and the movable mount frame 29 of the welded object mount device 22, respectively. As shown in FIGS. 2 and 5 and 7, the structure is such that the fixed columns 33, 33a are provided.
And a mounting plate 39 fixed to the upper ends of the movable columns 37, 37a,
A planar U-shaped mounting frame 40 mounted on the front side of the mounting plate 39, a mounting rod 41 pivotably supported on the upper end edge of the mounting frame 40, and a support bolt or the like on the mounting rod 41. Clamp head 42 connected in parallel with the mounting rod 41 via
And a long link f whose one end is pivotally attached to the mounting frame 40 side.
And a link mechanism 43 in which a short link g having one end pivotally attached to the side of the mounting rod 41 is combined. The free end sides of the link mechanism 43 are pivotally supported with respect to each other, and the pneumatic cylinder device 32 described later is formed. Is drivingly coupled to.

Next, as shown in FIGS. 2 and 7, the pneumatic cylinder device 32 is provided with a cylinder mounting frame 44 fixed to the rear side of the mounting plate 39 and the mounting frame 44 tilted at a predetermined angle. The attached pneumatic cylinder 45 and the pneumatic cylinder 45
And a piston rod 46 that moves forward and backward by the driving of the piston rod 46, and a link mechanism 43 is rotatably supported at the tip of the piston rod 46. In FIG. 7, reference numeral 47 denotes a stopper that holds the clamp head 42 at the standby position by receiving the backward movement of the link mechanism 43 when the clamp head 42 is erected at the uppermost position.

The case 21 for the switch, which is the object to be welded and is set in the welding object attaching device 22, will be described. The case 21 is used for a switch installed on a power distribution line described in the section of the related art of the present specification, and is formed by bending a stainless steel plate. 12, 1
3, the schematic structure of the case 21 will be described. FIG. 12 shows a case 21 after the welding work. The case 21 is formed by bending a stainless steel plate into a substantially U-shape to form a case body 21a.
Is formed and the tip of the bent portion of the case body 21a is further bent outward at a right angle to form the flange portions 21b, 2b.
1b is provided. Then, as shown in FIG. 12, the pair of case element bodies 21a, 21a bent and formed in the U shape are
The flange portions 21b, 21b are overlapped with each other to form a square tubular case 21, and the welding device 20 of the present invention is used.
The parts to be welded with are the overlapped flange parts 21b, 21.
It is the upper edge of b. A partition wall c for partitioning the interior into two chambers is attached in the case 21.
Further, the side plate of the case 21 is provided with a required number of mounting holes 21d for mounting a lead-out porcelain tube (not shown).

Next, the flange portion 21 of the case 21
A schematic configuration of the welding robot 23 that joins b and 21b will be described. In FIG. 1, reference numeral 50 denotes the main body of the welding robot 23, and the arm 51 is installed so as to advance and retract toward the welded object attaching device 22 side by electric operation. Reference numeral 52 denotes a welding head attached to the end of the arm 51 of the welding robot 23. The welding head 52 can be moved forward and backward in a radial direction or can be turned up and down and left and right like a human wrist by electric operation, that is, the swing can be arbitrarily performed. It is provided so that it can be done. Further, as shown in FIG. 10, the welding head 52 is provided with, for example, a torch 53 for TIG welding and a contact tip 55 for supplying the welding wire 54 to the melting portion. In FIG. 10, reference numeral 56 is a tungsten electrode.

Further, in FIGS. 6 and 8, reference numeral 60 denotes the first and second cooling receiving plates 30 and 30 via the side plate of the case 21.
The case 21 is a laterally long and narrow case pressing plate mounted on a, and the case 21 is fixed by pressure contact with the first and second cooling receiving plates 30 and 30a by the clamp head 42 lowered by the clamp means 31. . Reference numerals 61 and 61a denote stopper bodies attached to the end portions of the first and second cooling receiving plates 30 and 30a, respectively, and as shown in FIGS. Case 21 mounted on 35, 35a
Also, the case 2 receives the ends of the pressing plates 60, 60.
1 etc. are prevented from moving laterally during welding. Reference numeral 62 is an operation switch of the pneumatic cylinder device 32.

Next, the operation of the welding device 20 of the present invention will be described. First, referring to FIGS. 2 and 3, a case where the case 21 which is an object to be welded is set in the welding object attaching device 22 will be described. When the case 21 is set, as shown in FIG. 3, the movable mounting frame body 29 is manually moved on the welding mount 27 in a direction of separating it from the fixed mounting frame body 28. That is, the carriage 36 is manually moved to the right in FIG.
A space is provided between the movable mounting frame 29 and the movable mounting frame 29 so that the case 21 can be fitted therein. Subsequently, the case 21 formed in a rectangular tube shape shown in FIG. 12 is mounted on the first mounting base 35 of the fixed mounting frame 28. Case 2 mounted on the above-described mount 35
FIG. 12 shows a pair of case elements 21a formed by bending a stainless steel plate into a substantially U shape, and the flange portions 21b and 21b at the ends of the bent portions that are bent into the U shape. As described above, the overlapping portions are overlapped with each other, and the overlapped portions are temporarily fixed by spot welding or the like so as not to be disassembled, so that they are formed in advance in a rectangular tube shape. Further, when the case body 21a is temporarily fixed in a rectangular tube shape, a partition wall c that partitions the inside of the case 21 is formed.
Needless to say, it is temporarily fixed in advance to a predetermined position of the case body 21a by spot welding or the like.

When the square tubular case 21 temporarily fixed as described above is mounted on the first mount 35, the case 2 is used.
As shown in FIG. 3, the partition wall c side of FIG.
Side, and in this state, the opening end of the case 21 located in the direction away from the partition wall c (leftward in FIG. 3) is lifted and placed on the first mounting table 35 as shown in FIGS. , One of the flange portions 21b, 21b is mounted on the first cooling receiving plate 30, and in this state, the case 21 is maintained horizontally to the back of the fixed mounting frame 28 (leftward in FIG. 3). As shown in FIG. 5, one side of the case 21 is pushed to bring the one opening edge of the case 21 into contact with the concave portion of the stopper body 61 on the side of the fixed mounting frame 28, so that one side of the case 21 is placed on the first mounting table 35. To board. Subsequently, the movable mounting frame 29 corresponding to the fixed mounting frame 28 is moved to the left in FIG.
The second mounting base 35a provided on the fixed mounting frame 29 is moved to the fixed mounting frame 28 side, fitted into the case 21 from the other opening end of the case 21, and moved as shown in FIG. By bringing the other opening end edge of the case 21 into contact with the stopper body 61a on the side of the mounting frame body 29, the case 21 is fixed and movable to the mounting frame bodies 28 and 29. , 35a can be mounted and fitted.
When the case 21 is set in the welded object mounting device 22, the clamping means 31 is set by the pneumatic cylinder device 32.
As shown in FIG. 7, since the case 21 is in the upright state, the work of loading the case 21 can be performed smoothly.

The case 21 fitted and mounted on the first and second mounting bases 35 and 35a has flange portions 21b and 21b.
Only one inner surface of b has the first and second cooling receiving plates 30, 3
Although it is mounted on 0a, as shown in FIG. 7, it is received in a point state by a plurality of case support bolts 63, 63 that are previously planted on the mounting bases 35, 35a. As a result of being fitted and mounted horizontally on the mounting bases 35, 35a of the case 21, the case 21 swings on the first and second mounting bases 35, 35a with the overlapping portion of the flange portion 21b facing upward. Instead, it can be smoothly and satisfactorily mounted on the welded object attaching device 22. Subsequently, as shown in FIGS. 6 and 7, the flange portion 21b located on the upper side of the case 21,
Horizontally long case pressing plates 60, 60 are placed on both sides of the stopper 21b with the flanges 21b, 21b sandwiched between the stopper bodies 61, 61a.

The case pressing plates 60, 60 are attached to the case 21.
After mounting on the upper side, the pneumatic cylinder device 32 is driven to lower the clamp means 31 onto the case pressing plates 60, 60, and the case 21 is cooled by the cooling receivers provided on the first and second mounting bases 35, 35a. Pressed and fixed on the plates 30 and 30a. That is, in FIGS. 6 and 7, when the pneumatic cylinder 45 is driven and the piston rod 46 is pushed out from the cylinder 45, the link mechanism 43 at the tip of the piston rod 46 operates and the mounting rod 41 is linked to the link mechanism 43. The clamp heads 42 mounted on the mounting rod 41 are lowered onto the case pressing plates 60, 60 as shown in FIG. Is pressed against the case 21 side. As a result, as shown in FIG. 9, the case 21 has the first and second cooling receiving plates 3 on which it is mounted.
Since 0 and 30a themselves are formed in an arc shape with a slight curvature, they can be pressed and fixed along the cooling receiving plates 30 and 30a in a state in which reverse strain is applied in advance.

Further, as shown in FIG. 7, when the clamp head 42 is moved down by the pneumatic cylinder 45 at the same time on the left and right sides, the collision occurs on the way, so that the operation switch 62 is used to, for example, the welding mount 27. First, the pneumatic cylinder 45 installed at the upper end edge on the side of the fixed column 33a and the movable column 37a (see FIG. 5) which are upright on one side is driven,
Lower the clamp head 42 located on the right side of FIG.
Subsequently, the fixed column 33 and the movable column 37 on the opposite side corresponding to each other.
When the pneumatic cylinder 45 installed on the side is driven to lower the clamp head 42 located on the left side of FIG. 7, that is, by operating the left and right clamp heads 42, 42 with a time lag, the clamp head 42, It is possible to surely avoid the collision between the 42. As a result, the fixed columns 33, 33a and the movable columns 37, 37a can be designed with the minimum width dimension with respect to each other.

The case 21 is operated by operating the clamp means 31.
After fixing and supporting the fixed and movable mounting frames 28 and 29, as shown in FIG. 11, when the water supply source d is automatically opened and cooling water is passed through the water passages 38 and 38a, the water passage 3
The side plate adjacent to the flange portion 21b for welding the case 21 is forcibly cooled through the cooling receiving plates 30 and 30a having the embedded 8 and 38a. In this state, the arm 51 moves the welding head 52 of the welding robot 23 in response to commands such as movement and copying control from the control device 24, as shown in FIG.
1b Move to the welding start position at the left end. When the welding robot 23 is energized in this state, as shown in FIG. 10, the welding current, the shield gas and the like are supplied to the torch 53 of the welding head 52. Further, the welding wire 54 is fed by the contact tip 55 to the flange portion 21b of the case 21 at an appropriate speed. As described above, when welding is started, as shown in FIG. 10, a welding current flows from the tungsten electrode 56 to the flange portion 21b, whereby the overlapping portions of the flange portions 21b and 21b of the case 21 are gradually melted. At the same time, the wire 54 also melts and welds the overlapped portion (joint portion) of the flanges 21b, 21b of the case 21. Then, the melted portions of the flange portions 21b, 21b solidify sequentially and regularly as the welding progresses.

The welding head 52 controls the torch 53 to move linearly along the flange portion 21b for welding together with the wire 54 in response to a movement command from the controller 24, and the welding end position of the flange portion 21b (see FIG. Welding is continued until it reaches the right end of 4) and the welding is completed.
The heat input generated during the welding of the flange portions 21b, 21b is due to the fact that the material of the case 21 is a stainless steel plate,
It has poor thermal conductivity and is hidden by the flange portions 21b and 21b. However, the flange portion 2 for welding the case 21
As shown in FIGS. 8 and 9, the peripheral edges 1b and 21b are in direct contact with the first and second cooling receiving plates 30 and 30a, and
Water passages 38, 3 piped in the cooling receiving plates 30, 30a
Since the cooling water is passed through 8a during welding of the flange portions 21b, 21b, the heat input is the cooling receiving plates 30, 30a.
Is absorbed well and can be diffused from the periphery of the flange portions 21b, 21b. That is, the flanges 21b and 21b around which welding is performed are efficiently cooled by the presence of the cooling receiving plates 30 and 30a through which cooling water flows, and the heat input during welding is hidden near the welded parts. Can be resolved smoothly and satisfactorily.

One flange portion 21b, 2 of the case 21
When the welding work of 1b is completed, the operation switch 62 is operated to activate the pneumatic cylinder 45, the clamp means 31 is rotated by the link mechanism 43, and the clamp head 42 is moved to the position shown in FIG.
As shown in FIG. 5, the case pressing plates 60, 60 are lifted to release the pressure contact, and the pressing plates 60, 60 are once removed. Thereafter, the movable mounting frame 29 is separated from the position close to the fixed mounting frame 28 side shown in FIG. 4 by using the carriage 36 as shown in FIG. Next, the case 21 is once pulled out from the first mounting base 35 of the fixed mounting frame 28, the welded flange portion 21b is directed downward, and then the case 21 is fitted into the first mounting base 35 again. Carry together. That is, the inner surfaces of the flange portions 21b, 21b, which are located on the lower side until now, are welded to the cooling receiving plates 30, 3
It is placed on 0a in the same manner as described above.

After the welding of the one flange portion 21b, 21b of the case 21 is completed in this way, the clamping means 31
Is released and the case 21 is inverted to weld the other flange portion 21b, 21b. In this case, the flange portion 21b, which has already been welded, is welded.
Since 21b is forcibly cooled in the periphery of the welded portion during welding, it does not undergo thermal deformation, and although there is some heat input to the welded portion after welding, the periphery of the welded portion is a cooling receiving plate during welding. Since the reverse strain is applied by 30, 30a, while the residual heat input is naturally extinguished, the part to which the reverse strain is applied returns to the original state (horizontal state). It is possible to reliably solve the problem that the periphery of the welded portion of the case 21 is thermally deformed due to the residual.

Then, the flange portion 21b on the opposite side,
When 21b is mounted on the first mounting table 35 and the setting at the welding site is completed, the movable mounting frame 29 is moved to the fixed mounting frame 28 side, and the case 21 is fixed and movable in the same manner as described above. First and second mounts 35, 35a of the mounting frames 28, 29
The inner side surfaces of the flange portions 21b, 21b that are fitted to and welded to each other are placed on the first and second cooling receiving plates 30, 30a.
After that, the case pressing plates 60, 60 are placed on both sides of the flanges 21b, 21b for welding, and the case pressing plates 60, 60 are pressure-contacted by the clamp means 31 to form the case 2
1 is fixed to the welded object attaching device 22. Subsequently, water is passed through the cooling receiving plates 30 and 30a, and the welding robot 23 is operated to weld the remaining flange portions 21b and 21b, whereby the pair of case elements 21a and 21a are connected to the flange portion 21b. , 21b are joined by welding to complete the welding work on the flange portions 21b, 21b of the rectangular tubular case 21.

As described above, in the present invention, since the method of welding is performed by forcibly cooling the welded portion with the cooling water, there is no possibility that the periphery of the welded portion is thermally deformed. , For example, when manufacturing a case for a switch for distribution lines using stainless steel plates, even if welding work is performed on the joint, no thermal distortion occurs in the case itself. It is possible to reliably eliminate the problems that make the drive of the incorporated device unsmooth and make it difficult to use. Although the present invention has been described with respect to an embodiment in which a case of a switch used for a distribution line is welded, the present invention is not limited to this, and is of course applicable to all cases in which a member using a stainless steel plate is welded. Is.

[0033]

Since the present invention is constructed as described above, it has the following effects. (1) According to the present invention, since the cooling receiving plate having excellent thermal conductivity, through which the cooling water flows, is laid under the welding portion of the workpiece, heat input generated during welding and hidden in the welding portion. Can be satisfactorily excluded from the welded portion, so that the object to be welded can be surely protected from the evil caused by the heat input during welding, and the welding work can be performed quickly and surely. Moreover, since it is possible to protect the object to be welded from the harmful effects of heat input,
No work is required to straighten the work piece after welding.

(2) In the present invention, the clamp means for pressing the welded portion of the work piece so as not to swing during welding can be driven with a time lag between them, so that the clamp means can be driven. As a result, they can be installed close to each other.As a result, a weldment mounting device that holds and holds the workpiece to be welded can be manufactured with the minimum required dimensions, which makes it possible to reduce the size and weight of the welding device itself. You can measure.

(3) In addition, the cooling receiving plate on which the welded portion of the workpiece is fitted and mounted is subjected to reverse strain in the welded portion in order to prevent thermal deformation of the welded portion after welding. Since it is formed in a bow shape in advance to be applied, the welded object can satisfactorily remove the heat input during welding, and the welded part can be smoothly and satisfactorily without causing thermal deformation. Can be welded.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a welding device of the present invention.

FIG. 2 is a perspective view of a welding object attaching device used in the welding device of the present invention.

FIG. 3 is a side view of the welded object attaching device showing the process of attaching the welded object.

FIG. 4 is a side view of the welded object attaching device showing a state in which an object to be welded is attached.

FIG. 5 is a plan view showing a state where the object to be welded is being attached.

FIG. 6 is a plan view showing a state in which an object to be welded is also attached.

FIG. 7 is an explanatory diagram illustrating an opened state of a clamp unit.

FIG. 8 is an explanatory view showing a state in which the object to be welded is clamped by the clamp means.

FIG. 9 is a cross-sectional view showing a main part of the welded object attaching device showing a cooling state during welding of the object to be welded.

FIG. 10 is an explanatory diagram illustrating a welding state of an object to be welded.

FIG. 11 is an explanatory diagram showing a flow path of cooling water during welding.

FIG. 12 is a perspective view of a switch case that is an object to be welded.

FIG. 13 is likewise a sectional view showing a main part of the case.

FIG. 14 is a front view of a switch used for a distribution line shown as an example of a case to be welded by the welding device of the present invention.

FIG. 15 is a vertical cross-sectional view of the same switch.

FIG. 16 is a vertical sectional front view of an essential part of the switch.

FIG. 17

[Explanation of symbols]

 20 Welding device 21 Case 22 Welding object mounting device 23 Welding robot 27 Welding platform 28 Fixed mounting frame body 29 Movable mounting frame body 30 First cooling receiving plate 30a Second cooling receiving plate 31 Clamping means 32 Pneumatic cylinder device 35th 1 mount 35a 2nd mount 38, 38a Water pipe 42 Clamp head 43 Link mechanism 50 Welding robot body 52 Welding head 60 Case holding plate

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a welding device of the present invention.

FIG. 2 is a perspective view of a welding object attaching device used in the welding device of the present invention.

FIG. 3 is a side view of the welded object attaching device showing the process of attaching the welded object.

FIG. 4 is a side view of the welded object attaching device showing a state in which an object to be welded is attached.

FIG. 5 is a plan view showing a state where the object to be welded is being attached.

FIG. 6 is a plan view showing a state in which an object to be welded is also attached.

FIG. 7 is an explanatory diagram illustrating an opened state of a clamp unit.

FIG. 8 is an explanatory view showing a state in which the object to be welded is clamped by the clamp means.

FIG. 9 is a cross-sectional view showing a main part of the welded object attaching device showing a cooling state during welding of the object to be welded.

FIG. 10 is an explanatory diagram illustrating a welding state of an object to be welded.

FIG. 11 is an explanatory diagram showing a flow path of cooling water during welding.

FIG. 12 is a perspective view of a switch case that is an object to be welded.

FIG. 13 is likewise a sectional view showing a main part of the case.

FIG. 14 is a front view of a switch used for a distribution line shown as an example of a case to be welded by the welding device of the present invention.

FIG. 15 is a vertical cross-sectional view of the same switch.

FIG. 16 is a vertical sectional front view of an essential part of the switch.

[Explanation of Codes] 20 Welding device 21 Case 22 Welding object mounting device 23 Welding robot 27 Welding platform 28 Fixed mounting frame 29 Movable mounting frame 30 First cooling receiving plate 30a Second cooling receiving plate 31 Clamping means 32 Empty Pressure cylinder device 35 1st mounting stand 35a 2nd mounting stand 38,38a Water pipe 42 Clamp head 43 Link mechanism 50 Welding robot main body 52 Welding head 60 Case holding plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B23K 9/23 B 8315-4E

Claims (4)

[Claims] 1. A laterally long welding pedestal is provided with a clamp means at an upper end thereof, and fixed mounting frames are planted on both sides in the width direction of the welding pedestal so as to face each other, and the other side of the welding pedestal is provided. On both sides in the width direction, a movable mounting frame body having a clamp means at the upper end is movably installed toward the fixed mounting frame side, and a tubular workpiece is attached to both the fixed and movable mounting frame bodies. The mounting bases for mating and mounting are installed horizontally,
A cooling plate for cooling the welded part of the workpiece is laid on each of these mounts to form a welded object mounting device, and the welding head maintains a predetermined space with the welded object mounting device. A welding robot that moves closer to and away from the welded object is placed, and the welded part of the welded object mounted on the welded object mounting device and fixed by the clamp means is forcibly cooled by the cooling receiving plate and welded. Welding equipment for steel plates. 2. Clamping means installed on the fixed mounting frame and the movable mounting frame so as to face each other, are configured to be driven by a cylinder device for driving the clamping means with a certain time lag. The steel plate welding apparatus according to claim 1, wherein: 3. A cooling steel plate laid on the gantry according to claim 1, wherein the cooling steel plate is bent in an arc shape with a predetermined curvature to apply reverse strain to the welded portion of the workpiece. Welding equipment. 4. The steel plate welding apparatus according to claim 1, wherein the cooling receiving plate is configured by burying a predetermined number of cooling water passages communicating with a water supply source, a drainage groove, and the like.