JP2899276B1 - Butt joining apparatus and joining method for strip-shaped metal sheets - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To make it possible to easily and accurately abut and abut both cut end faces of a work in a butt welding of a strip-shaped metal sheet, so that a more ideal welded portion can be obtained. To SOLUTION: A cut end face of a work is brought into contact with both sides of a center reference plate protruding upward from an upper surface of a lower clamp, and then appropriate portions of both works are located above the upper surface of the lower clamp by a distance L. with the upper surface of the working table located fixedly supported by the workpiece clamp, then place the upper clamp to the opposite shape at intervals G _O at the same height position as and working table above the lower clamp,
The center holding plate is inserted vertically through the gap G _{O, and} the lower end surface of the center holding plate moves the lower clamp upward while pressing the cut ends of both works toward the lower clamp side, thereby moving the center reference plate upward. Withdrawing from between the two cut end faces, holding the cut end of the work between the lower clamp and the upper clamp, and then removing the presser plate, then joining the butted parts of both works by TIG welding. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used in a press line for mass-producing various parts such as a lead frame from a strip-shaped metal sheet wound in a coil shape. TI at end and start
The present invention relates to a joining device for performing butt welding by G welding and an improvement in a joining method using the same.

[0002]

2. Description of the Related Art Generally, in a press line for forming and processing parts such as a lead frame while continuously drawing and supplying a strip-shaped metal sheet (hereinafter referred to as a work), a work is inserted into a press die. When the end of the coiled work that is being fed is approaching, the supply of the work is stopped, and the start of the new coiled work is stopped at the end. The parts are butt-welded, and then the work is continuously supplied to the press line again.

[0003] In the butt welding of thin metal sheets as described above, not only the mechanical strength of the welded portion is ensured, but also the finishing accuracy of the welded portion, for example, the thickness and linearity of the welded portion. High precision is required. Because,
If the welding accuracy of the welded portion is poor, the press die is damaged, or the quality of the molded product including the welded portion is extremely deteriorated.

[0004] For this reason, various kinds of bonding apparatuses and methods for bonding such metal sheet materials have been developed and put to practical use. FIG. 9 and FIG. 10 show a typical example of this type of bonding apparatus.
No. 7382. That is, the joining device D shown in FIGS. 9 and 10 places the frame 32 on the guide rail 31 provided on the base 30 so as to be movable in the direction of the arrow, and places the transport base 33, the high-speed transport base 34, Device 35, holding device 36, welding device 3
7 and a rolling device 38 are provided.

[0005] The strip-shaped metal sheet (work) a is conveyed along the high-speed conveyance base 34, and is fed out to a press device (not shown). The remaining amount of work is low,
When the end of the work a reaches the joining device D, the feed of the work a and the operation of the press device are stopped, a new coiled work a is replaced and mounted, and the start end of the work a is placed on the high-speed transport base 34. Drawn out. Thereafter, the frame 32 is advanced by the cylinder 39, and the end of the work a being processed and the start end of the new work a are moved onto the transport base 33, where the end and start ends of both works a are cut. Each is cut by the device 35. Then, both cut ends are pressed and fixed in a butt state directly below the welding torch 40 by the holding device 36, and the butt portion is TIG-welded by the welding device 37.

[0006] When the butt welding of the end portion and the starting end portion of the work a is completed, the welded portion is moved directly below the rolling device 38 and rolled by the rollers 41 of the rolling device 38 to make the thickness of the welded portion uniform. . After that, the frame 32 is retracted by the cylinder 39, and the joined work a is moved onto the high-speed transport base 34, and then the press device and the like are restarted. As a result, the newly mounted coil-shaped work a is continuously supplied to the press device or the like.

By the way, in the conventional joining apparatus D,
When butt welding both cut ends of the work a,
First, as shown in FIG. 11 and FIG.
Flat plate-shaped copper electrode plate (lower clamp) 42a / 42
b, between 0.1 and 0.2 mm thick stainless steel
Insert the gauge plate 43 vertically, and then
Kua₁Cut end a₁'To the side of the gauge plate 43
Then, the copper electrode plate (upper clamp) 44a is
Let go down and cut end a₁′, And then the gauge plate
43 and the other work a_TwoCut end a_Two′
The work a ₁Cut end a₁′ End face,
Lower the other upper clamp 44b to cut the end a._Two′
After fixing the welding torch 40,
The welding torch 40 while keeping the position at the specified value.
By running along the joint, both cut ends a₁′
・ A_Two′ Are welded.

However, it is extremely difficult to bring the two cut ends a ₁ ′ and a ₂ ′ into accurate butting contact, and requires considerable experience and skill. In particular, when the eyesight is deteriorated due to the age of the worker, not only does the butt contact work take much time, but also a gap is formed in the butt contact surface, or both cut ends a ₁ ′ ・ a ₂ ′
Often cause partial overlap. If the two cut ends a ₁ ′ and a ₂ ′ are not completely abutted with each other, poor penetration of the welded portion, unevenness in the thickness of the welded portion, perforation, bending of the joint portion, etc. may occur. This causes various inconveniences in the pressing process and the like.

Further, in the conventional bonding apparatus D, FIG.
As shown in FIG. 3 and FIG. 14, the arc P is generated by lowering the welding torch 40 and appropriately adjusting the interval between the tip of the electrode rod and the joint, but this corresponds to the positioning of the tip of the electrode rod. And the arc P in the initial stage is likely to be unstable. As a result, there is a problem that a so-called burn-out portion e is generated at the end of the joint portion, and the consumption of the tungsten electrode rod S becomes severe. Wake up.

Incidentally, in order to prevent the occurrence of the burn-through portion e, a tab material T is provided at the end of the joint as shown by a dotted line in FIG. A TIG welding method has been developed in which an arc P is generated and the torch 40 is moved in the direction of the arrow after the initial arc P has become stable. However, even with this welding method, it is troublesome to set the tab material T. In addition, it is necessary to remove the tab material T after welding and to remove burrs between the tab material T and the work-joined portion, which leaves many practical problems.

[0011]

SUMMARY OF THE INVENTION The present invention relates to the above-mentioned problem in the conventional butt welding of such band-shaped thin metal sheets, namely, to accurately butt and contact the cut end faces of the workpieces to be joined. It is extremely difficult to achieve ideal welding because of partial overlap and uneven gaps, and considerable skill is required to quickly and accurately abut and abut the cut end faces. It is difficult to obtain an excellent operator, it takes time to position the tip of the electrode rod at the start of welding, and the arc at the beginning of welding is unstable. That is, when the tab material T is used, the problem that the work efficiency of the butt welding is greatly reduced is solved, and the cut end faces of the workpieces are extremely easily and accurately butted. Make contact A butt-joining method of a strip-shaped metal thin plate that can perform ideal welding with high efficiency with no burn-through and with little electrode rod wear, with a stable arc from the beginning of welding. An object of the present invention is to provide a bonding apparatus used for this.

[0012]

According to the first aspect of the present invention, a strip-shaped metal sheet is cut by a cutting device, and the cut end faces are butt-fixed, and the butt portion is TIG-fixed.
In a joining device that is to be welded by a welding device,
A cabinet main body 1 provided with a work table 1a on which a strip-shaped thin metal plate is placed, and upper clamps 5a and 5b arranged opposite to each other with a gap G _O above the work table 1a.
And a distance L from the upper surface of the center of the work table 1a.
And a lower clamp 15 which is held and fixed only below and is pushed up to the same height position as the work table 1a by the drive unit 22, and is provided on the work table 1a so as to be vertically movable, and both strip-shaped metal sheets a ₁ Work clamps 6a and 6b for holding and fixing a ₂ on work table 1a
A center reference plate 17 made of a thin plate in which a central portion of the lower clamp 15 is vertically inserted and supported and fixed, and an upper portion 17a of the lower clamp 15 projects upward from an upper surface of the lower clamp 15 at a lower position; Holding guide plates 16a and 16b, which are disposed on the lower clamp 15 at both sides of the center reference plate 17 and press and hold the vicinity of the front ends of the two strip-shaped thin metal plates a ₁ and a ₂ on the lower clamp 15; The cut ends a ₁ ′ and a ₂ ′ of the strip-shaped metal plate, which is vertically inserted through the gap G _O between the upper clamps 5 a and 5 b and abuts against both side surfaces of the center reference plate 17, are clamped from above by the lower clamp 1.
A basic structure of the present invention is to include a center pressing plate 18 for pressing to the fifth side.

According to a second aspect of the present invention, in the first aspect of the present invention, the arc guide screw 24 is moved to the vicinity of the welding start side of the butt portion W of the strip-shaped thin metal plates a ₁ and a ₂ of the lower clamp 15.
Is screwed so that the height position can be adjusted.
4, the tip of the electrode rod 20 of the TIG welding apparatus 4 is positioned on the top surface of the TIG welding apparatus 4 to generate a welding arc 21.

According to a third aspect of the present invention, a strip-shaped metal sheet a₁・ A
_TwoProject upward from the upper surface of the lower clamp 15
Abutted against both sides of the center reference plate 17
And then both strip-shaped metal sheets a₁・ A_TwoBelow the appropriate places
Work that is located a distance L above the upper surface of the
Work clamps 6a and 6b on the upper surface of the work table 1a
And then fixed above the lower clamp 15
At the same height as the work table 1a_OTo
When the upper clamps 5a and 5b are arranged facing each other,
The interval G_OThrough the center holding plate 18
At the lower end of the center press plate 18.
Double strip metal sheet a₁・ A_TwoCut end a of₁'・ A_Two′
Press the lower clamp 15 upward while pressing it toward the lower clamp 15 side.
By moving the center reference plate 17
Withdraw from between both cut end faces, and lower clamp 15
Metal strips a between the upper and lower clamps 5a and 5b₁
・ A _TwoThe holding end of the holding plate 18 is then held.
After removal of both strip-shaped metal sheets a₁・ A_TwoButting
It is a basic feature of the present invention that the joint W is joined by TIG welding.
It should be.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a butt-joining apparatus for a strip-shaped metal sheet (work) according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a plan view thereof. The butt-joining apparatus A according to the present invention is formed in a movable cabinet type, and a welding gas cylinder (argon gas) 2 and its accessories, a welding cylinder, and a welding cylinder 1 are provided inside a cabinet 1 provided with a work table 1a. Power supply device and its control device (not shown), power supply cable reel body (not shown), drive motor and drive cylinder (not shown) of cutting device 3, welding device 4, rolling device 7, etc. A drive motor, a control device for a drive cylinder (not shown), and the like are stored.

A cutting device 3, a welding device 4, and upper clamps 5a and 5b of a work are arranged movably in the front-rear direction at the back of the work table 1a of the cabinet 1. A rolling device 7 is provided on the upper right side of the table 1a, and work lamps 6a and 6b are movable up and down on the table 1a located on both outer sides of the upper clamps 5a and 5b of the work. Is provided.

The work piece upper clamps 5a and 5b
Is a work both ends a as described later. ₁'・ A_Two′ Top
Side before the welding of the butt joint.
Sending out the upper part of the table 1a by the operation of the switch 8a
Will be. Also not shown in FIGS. 1 to 3
However, in the central portion of the table 1a,
The clamps 15a and 15b are slightly
1a, move upward and downward while sinking below the upper surface.
The lower clamps 15a and 15b
By pushing the upper clamp 5a upward.
Of the work between the lower clamp 5a and the lower clamps 15a and 15b.
Both ends a₁'・ A_Two'Is held and fixed.

Further, in FIGS. 1 to 3, reference numeral 8 denotes an operation switchboard for operating various devices such as the cutting device 3 and the welding device 4, and is provided with a plurality of air switches 8a to 8n. An operation panel 9 is provided with meters for setting welding conditions, electrode positions, and the like. FIG.
3 to 10, reference numeral 10 denotes a caster, reference numeral 11 denotes a caster foot lock device, and reference numerals 12 and 13 denote electric and pneumatic cable reels.

The cutting device 3 cuts the ends of the works a ₁ and a _{2 in} a straight line, and includes a fixed blade, a movable blade, a work clamp, a cutting table, and the like. The movement in the front-back direction, the operation of the movable blade, the operation of the clamp, and the like are all automatically operated by operating the air switch 8a on the operation switch panel 8.

[0020] Incidentally, the cutting device 3 is led into the work a ₁ · a ₂ cutting only when on a table 1a, except when a workpiece cutting are stored pushing the table 1a inner part. Also,
Since the configuration of the cutting device 3 itself is known, a detailed description thereof is omitted here.

The welding device 4 is a so-called TIG welding type welding portion. By operating an air switch 8a on the operation operation switch panel 8, a welding torch 20 of the welding device 4 is provided.
Is automatically held at the set position, and moves linearly at a predetermined speed along a butt line between both end faces of both works a ₁ and a ₂ . The configuration and operation of the welding device 4, the welding mechanism, and the like are all publicly known, and therefore, detailed description thereof is omitted here.

The rolling device 7 is always disposed on the right side of the table 1a and comprises a receiving plate and rolling rollers. When the welding of the butt portion is completed, the welding portion is positioned on the receiving plate, and the rolling roller to which the downward pressing force is applied is moved back and forth along the welding portion to press the welding portion. To make the thickness uniform. still,
Since the configuration and operation of the rolling device 7 are known,
Detailed description is omitted.

FIG. 4 shows a butt joining apparatus A according to the present invention.
5 is an enlarged cross-sectional view showing an inserted state of the center press plate 18 at the work butting portion in FIG. 4, and FIG. 6 is a vertical cross-sectional view of the work clamp 6b. .

In FIG. 4, 1a is a work table, 5
a and 5b are copper work upper clamps, 6a and 6b are work clamps, 14 is a welding torch, 15a and 15b are copper work lower clamps, 16a and 16b are steel holding guide plates, and 17 is a thin steel plate. A center reference plate, 18 is a center holding plate, 19 is a square hole formed in a work table, 20 is an electrode rod, 21 is an arc, and 22 (22a
22b) is a driving device (air cylinder), 23 is a support case body, and 24 is an arc guide screw.

The work table 1a is formed horizontally at the intermediate portion on the front side of the cabinet 1 as described above. A rectangular hole 19 is provided in the center of the work table 1a, in which lower clamps 15a and 15b are moved up and down with a stroke of about 3 to 6 mm by air cylinders 22a and 22b. It is arranged movably. In the present embodiment, the lower clamp 15a
Although 15b is divided, it is needless to say that these may be integrated into the lower clamp 15.

The work upper clamps 5a and 5b are formed of a copper material, and are supported so as to be horizontally movable in the front-rear direction as described above. That is, both upper clamps 5a and 5
b of the tip with at cross section is formed in a triangular shape, the tip bottom surface 5a of the disposed face shape at a slight gap G _O upper clamp '· 5b', the work a ₁ · a ₂ Hold and fix the top surface of the tip. The upper clamp 5a
- 5b is a horizontal movement only in the longitudinal direction without moving the upper and lower direction, when the clamp of the workpiece a _{1-a 2,} is moved to a position above the front of the hole 19 by operating the switch 8a, the horizontal It is held in a posture. In addition, the upper clamps 5a and 5
The lower surface of b is held at the same height level as the upper surface of table 1a.

The lower clamps 15a and 15b are thick flat plates made of a copper material.
It is disposed inside a hole 19 provided at the center of the portion a. That is, the lower clamps 15a and 15
b is arranged and held so that, in normal times (when the air cylinder is not operated), its upper surface is located at a distance L = about 2 to 4 mm below the upper surface of the work table 1a as shown in FIG. When the workpieces a ₁ and a ₂ are clamped, the upper surfaces thereof are lifted upward by 2 to 4 mm from the position shown in FIG. 4 by the air cylinders 22 a and 22 b.
The workpieces a ₁ and a ₂ are firmly held and fixed between the upper clamps 5 a and 5 b of the workpieces a ₁ and a ₂ while being raised to a position horizontal to the upper surface of the workpiece a.

The step distance L is equal to the work a ₁ · a ₂
The thickness can be adjusted as appropriate in accordance with the thickness t.
Further, between the lower clamps 15a and 15b, FIG.
As shown in FIG. 2, a center reference plate 17 made of a thin steel plate having a thickness of about 0.1 to 0.3 mm is provided with its upper end portion 17a slightly projecting upward, and both lower clamps 15a are provided. When 15b is lifted upward, the lower clamps 15a and 15b are pulled inward. The gap between the center reference plate 17 fixed to the cabinet main body 1 and the lower clamp 15 is used as a passage for a sealing welding gas (argon gas).

The pressing guide plates 16a and 16b have a thickness
It is a strip-shaped steel plate of about 2 to 3 mm.
7 are disposed on both sides. In addition, the presser
The base ends (rear) of the id plates 16a and 16b are lower clamps.
15 and its front end and lower clamp 15
Work a₁・ A_TwoFor inserting
It is a kana gap. In addition, work a₁・ A_TwoFor welding
In this case, as described later, the two guide plates 16a and 16b
Work a downward₁・ A_TwoInsert the tip of the
Cut end a ₁'・ A_Two′
It is.

As shown in FIG. 5, the center pressing plate 18 is formed of a steel plate having a thickness substantially equal to the gap G _O between the opposing upper clamps 5a and 5b. 18 for inserting the upper part 17a of the center reference plate 17 disposed through the
a is formed.

The workpiece clamps 6a and 6b are
60~100m _1-cut end portion a ₁ of a ₂ '· a _2'
A portion of about m is fixed on the table 1a.
The work clamps 6a and 6b are, as shown in FIG. 6, a holding claw body 25 having an inverted L-shaped cross section, a cylinder 26 for moving the holding claw body 25 up and down, and nylon or urethane adhered to the lower surface side of the holding claw body 25. The cylinder 26 is held and fixed to the table 1a, and the pressing claw body 25 is supported and fixed to the piston of the cylinder 26. In FIG. 6, reference numeral 28 denotes a stopper for regulating the position of the inserted works a ₁ and a ₂ .

[0032] The arc guide screw 24 is formed by a copper material, both work a ₁ ·, as shown in FIGS. 7 and 8
a ₂ is provided on the side of the butt portion ω, and the lower clamp 1
5 is screwed and fixed so that the height position can be adjusted. That is, the head of the arc guide screw 24 is formed in a flat shape, and a tapered surface 24a is provided on an outer peripheral portion thereof.

For example, the thickness t of the work a is 0.2 mm
In the case of, the head height of the arc guide screw 24 is
When the welding torch 14 is operated is lowered the electrode rod 20, the distance l ₁ between the head top face and the electrode rod 20 tip is adjusted so that 0.1~0.2mm Further, the distance l ₂ between the side surface and the workpiece a ₁ · a ₂ arc guide screw 24 is 0.2 to 0.3 mm, the work a ₁ ·
The distance between a ₂ and the electrode rod 20 distal l ₃ is from 0.3 to 0.
Each is set to 7 mm. The distances l ₁ and l
Needless to say, the sizes of ₂ and l ₃ are appropriately adjusted depending on the plate thickness t of the work a.

Next, the butt joining of the workpiece a by the butt joining apparatus A according to the present invention will be described. Referring to FIG. 4, first, cutting the tip of the terminal end and the new work a ₂ of the work a ₁ using the cutting device 3. Next, the cut end surface of the work a ₁ abutment Toe to sides of the center reference plate 17 through the distal end portion of the work a ₁ downward work clamp 6a and the pressing guide plates 16a, then by the work clamps 6a to work a ₁ Fix it. Similarly abutment Toe new cut end surface of the workpiece a ₂ to the other side of the center reference plate 17 to secure the workpiece a ₂ by the workpiece clamp 6b.

After the clamping of the front ends of the workpieces a ₁ and a ₂ is completed, the upper clamps 5 a and 5 b are moved forward (ie, above the lower clamp 15), and thereafter, as shown in FIG. The center holding plate 18 is fixed to the upper clamp 5a.
Insert from above through the gap G _O between 5b, fitted the upper protrusion 17a of the center reference plate 17 into the recess 18a of the center presser plate 18, the workpiece cut end a ₁ '· a _2'
Is pressed onto the lower clamp 15.

Thereafter, the air switch 8a is operated while pressing the center pressing plate 18 downward, and the air cylinder 2 is pressed.
The lower clamps 15a and 15b are moved upward by 2a and 22b, and the workpieces a ₁ and a ₂ and the center holding plate 1 are moved.
8 together with the lower clamps 15a and 15b on the table 1
Lift to the same horizontal position as a.

Since the lower end of the center reference plate 17 is fixed to the cabinet 1 side, the lower clamp 1
The increase of 5, with the protrusion 17a of the upper center reference plate 17 is withdrawn from the gap of the work cut end a ₁ '· a _2', the tip portion of the work a ₁ · a ₂ is, tables 1a and a lower state moves forward by a certain amount by a step L, which is provided, in which end faces of the two cut ends a ₁ '· a _2' are combined thrust precisely between the upper surface of the clamp 15, the upper clamp 5a · 5b Bottom 5a'.5
b 'and the upper surfaces of the lower clamps 15a and 15b are tightly held and fixed. Further, the center holding plate 18 held by hand is appropriately removed.

In the embodiment of FIGS. 4 and 5,
Cutting end a ₁ ′ · a of work by center pressing plate 18
_Although the pressing of ₂ ′ is performed manually, the center pressing plate 18 is separately held by a cylinder or the like, and the pressing operation of the work cutting ends a ₁ ′ and a ₂ ′ and the cutting end a ₁ '.A ₂ ' center clamp plate 1 after clamping
Needless to say, the removal of 8 may be automatically performed.

After the clamping of the cut ends a ₁ ′ and a ₂ ′ of the work is completed, the welding device 4 is operated by operating the switch 8a.
To automatically lower the welding torch 14 to a predetermined position. That is, the tip of the tungsten electrode rod 20 of the welding torch 14 is lowered to the vicinity of the top of the head of the arc guide screw 24 as shown in FIGS. , An arc 21 is generated.

When the arc 21 is generated, the electrode rod 20
Is moved in the direction of the arrow at a predetermined speed, and the generated arc 2
1 passes through the tapered surface 24a of the arc guide screw 24 and is carried over to the end of the butted portion ω of the workpiece, and then the TIG welding of the butted portion ω is performed.

When the welding is completed to the other end (left end) of the butting portion ω, the arc 21 is stopped and the welding device 4
Is raised and then pulled back to its original position. Further, in the present invention, since the arc 21 is carried over to the end of the butted portion ω of the work through the tapered portion 24a of the arc guide screw 24, the arc 21 becomes unstable or the vicinity of the end of the welded portion ω The so-called burn-through does not occur at all.

When the welding of the butt portion ω is completed, the butt weld portion is moved below the rolling device 7, and the welded portion is rolled by rollers by the same operation as before, so that the thickness thereof is made uniform. Thereafter, the butt-joined work is released from the butt-joining apparatus A and sent to a pressing step or the like.

It should be noted that the present invention can be applied to the butt joining apparatus A of the present invention.
As the work a to be cut, the thickness is 0.1 to 0.4 mm (copper
Brass / aluminum) and 0.1-0.3mm thick (iron / steel
And the width of the work is in the range of 15 to 45 mm.
It is. Also, the joining angle is about 100-110 °,
Allowable bending of the joint is 1 / 500mm, thickness of the joint and step
The difference is t₀≧ t₁(However, t₀Is the thickness of the weld, t₁Is pressure
(Thickness after elongation), the non-welded part at the end of the joint is 0.5 m on the starting side
m and the end side 0.5 mm or less, respectively.
You. Further, the power capacity of the butt joining device A is 7 KVA,
Compressed air pressure is 4kg / cm ^Two, Allowable ambient temperature is 0 to 45
° C respectively.

[0044]

According to the present invention, the lower clamp 15 is held at a position lower than the upper surface of the work table 1a by a distance L so as to be able to move up and down freely, and the lower clamp 15 is moved to both side surfaces of the center reference plate 17. Both workpieces a ₁・
near the junction of a _2, fixed on a table 1a by the work clamps 6a · 6b, and the two cut ends of the workpiece a ₁ · a ₂ a ₁ by the center presser plate 18 '· a _2'
While pressing the lower clamps 15a and 15b onto the lower clamps 15a and 15b, the lower clamps 15a and 15b are lifted upward to pull out the center reference plate 17 from between the two cut ends a ₁ ′ and a ₂ ′, and the upper and lower clamps 5 and 15. The butting portion is sandwiched and held between them. As a result, the lower clamp 15
When the workpieces a ₁ and a ₂ are lifted, there is a margin in the left and right movement amounts corresponding to the drop amount of the distance L in the workpieces a ₁ and a ₂ . When the center reference plate 17 is pulled out, it is in a state where the center reference plate 17 is accurately butted, there is no occurrence of partial overlap or gap at the joint, and an ideal butt joint can be welded.

Further, in the present invention, the arc guide screw 24 is provided near the welding start side of the butt portion, and the height of the arc guide screw 24 is first adjusted so that the initial distance between the screw head and the electrode rod 20 is increased. An arc is generated, and the initial arc is transferred to the butt portion ω via the tapered surface 24a of the screw head. As a result, the generated arc becomes extremely stable from the beginning of the welding start, and excellent butt welding without burn-through can be performed without using the tab T or the like as before. The present invention has excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is a front view of a butt-joining apparatus for a strip-shaped metal sheet.

FIG. 2 is a side view of the joining device of FIG. 1;

FIG. 3 is a plan view of the bonding apparatus of FIG. 1;

FIG. 4 is a longitudinal sectional view showing a main part of the butt joining device.

FIG. 5 is an enlarged cross-sectional view showing an inserted state of a center press plate at a butted portion of the work of FIG. 4;

FIG. 6 is a vertical sectional view of a work clamp (a in FIG. 4);
FIG.

FIG. 7 is a schematic plan view of a work butt portion of the butt joining device.

FIG. 8 is a schematic sectional view taken along the line II in FIG.

FIG. 9 is a front view showing an example of a conventional butt joining apparatus.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is an explanatory view of a conventional butt joining method (N
o1).

FIG. 12 is an explanatory view of a conventional butt joining method (N
o2).

FIG. 13 is an explanatory diagram of a butt joining method using a tab.

FIG. 14 is an explanatory diagram of a welded portion according to a conventional butt joining method.

[Explanation of symbols]

A is a butt joining device, a (a ₁ · a ₂ ) is a work (a strip-shaped metal sheet), a ₁ · a ₂ is a cut end of the work, t is a work plate thickness, ω is a work butt portion, L is table 1
a is the step between the lower clamp 15 and G _O is the distance between the upper clamp pieces, 1 is the cabinet body, 1a is the work table, 2 is the gas cylinder for welding, 3 is the cutting device, 4 is the welding device, 5a and 5b are the upper portions. Clamps, 5a 'and 5b' are bottom surfaces of tips, 6a and 6b are work clamps, 7 is a rolling device,
8 is an operation switch panel, 8a is an air switch, 9 is an operation panel, 10 is a caster, 11 is a foot lock device, 12 and 13 are cable reels, 14 is a welding torch, 15a and 15b are lower clamps, 16a and 16b. Is a guide plate, 17 is a center reference plate, 17a is an upper portion, 18 is a center press plate, 18a is a concave portion, 19 is a hole in a table, 20 is an electrode rod, 21 is an arc, 22a and 22a.
b is an air cylinder, 22 is a driving device, 23 is a support case body, 24 is an arc guide screw, 24a is a tapered surface,
25 is a claw body, 26 is a cylinder, 27 is a cushion member,
28 is a work stopper.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 37/04 B23K 9/025 B23K 9/167

Claims (3)

(57) [Claims] 1. A strip-shaped metal sheet is cut by a cutting device,
In a joining apparatus in which cut end surfaces are butt-fixed and the butt portion is welded by a TIG welding device, a work table (1) on which a strip-shaped thin metal plate is placed.
a), a cabinet body (1) provided with a), upper clamps (5a) and (5b) disposed opposite to each other with a space (G _O ) above the work table (1a), and a work table ( A lower clamp (15) which is held and fixed at a central portion of 1a) below the upper surface by a distance (L) and is pushed up to the same height as the working table (1a) by a driving device (22); The two metal strips (a ₁ ) and (a) are provided on the work table (1a) so as to be vertically movable.
₂ ) Work clamps (6a) and (6b) for holding and fixing the work clamp (1a) on the work table (1a);
The center part of 5) is vertically inserted and supported and fixed, and its upper part (17a) is attached to the lower clamp (1) at the lower position.
5) A center reference plate (17) made of a thin plate protruding upward from the upper surface of the center reference plate (17), and disposed on the lower clamp (15) at both sides of the center reference plate (17). a ₁₎ · (a ₂₎ pressing guide plate for pressing and holding the leading end portion vicinity of the lower clamp (15) above (16a) ·
(16b) and the cut end portion of the strip-shaped metal plate inserted vertically through the gap (G _O ) between the upper clamps (5a) and (5b) and brought into contact with both side surfaces of the center reference plate (17). a ₁ ′) and (a ₂ ′) are clamped from above to below (1
5) A butt-joining apparatus for a strip-shaped metal thin plate, comprising: a center pressing plate (18) for pressing to the side. 2. The height position of an arc guide screw (24) can be adjusted to a position near the welding start side of a butt portion (ω) of the strip-shaped metal sheets (a ₁ ) and (a ₂ ) of the lower clamp (15). And a welding arc (21) generated by positioning the tip of the electrode rod (20) of the TIG welding device (4) on the top surface of the head of the arc guide screw (24). 2. The butt-joining apparatus for a strip-shaped metal sheet according to 1. 3. The cut end faces of the strip-shaped metal sheets (a ₁ ) and (a ₂ ) are opposed to both side faces of a center reference plate (17) projecting upward from the upper surface of the lower clamp (15). Then, work clamps (appropriate portions of both strip-shaped metal sheets (a ₁ ) and (a ₂ )) are attached to the upper surface of the work table (1a) located above the upper surface of the lower clamp (15) by a distance (L). 6a) and (6b), after which the upper clamp (5a) is opposed to the upper clamp (5a) above the lower clamp (15) and at the same height as the work table (1a) with an interval ( _GO ). ) · (5b) and the center pressing plate (18) through the space (G _O )
Are vertically inserted, and the cut ends (a ₁ ′) and (a ₂ ′) of the two strip-shaped metal thin plates (a ₁ ) and (a ₂ ) are clamped by the lower end surface of the center pressing plate (18). By moving the lower clamp (15) upward while pressing toward the (15) side, the center reference plate (17) is removed from between the two cut end faces, and the lower clamp (15) and the upper clamp (5a) are removed. (5b), the cut ends of both strip-shaped metal sheets (a ₁ ) and (a ₂ ) are clamped and held, and then, after the holding plate (18) is removed, both strip-shaped metal sheets (a) are removed. ₁ ) A method of butt joining thin metal sheets, wherein the butt portion (ω) of (a ₂ ) is joined by TIG welding.