JP2001047281A - Device for butting and joining belt-like metal sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a butt welding in which a clearance between upper clamps is adjusted easily and exactly in accordance with the thickness of a metal sheet. SOLUTION: This device consists of the upper clamps 5a, 5b which are oppositely arranged providing the clearance Go above a worktable 1a, lower clamps 15a, 15b providing two slender stopper guide grooves in parallel-like, stoppers 26a, 26b which are freely slidable in the state where the head parts are slightly projected from the top surface of the lower clamps in the stopper guide grooves, work clamps 6a, 6b for fixing both works a1, a2 on the worktable, pressing guide plates for pressing and holding the tip parts of both the works on the lower clamps, setting plates 27 mounted to the upper parts of the works in the state where the plates are inserted under the pressing guides and an arc guide which is inserted and mounted rotatably in the vicinity of the work butting parts, on the top surface of the head part of which the tip part of a TIG welding electrode rod 20 is situated and with which welding arc is generated.

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 (hereinafter referred to as a work) wound in a coil shape. The present invention relates to an improvement in a joining device for butt-welding a terminal end and a start end of a work by TIG welding.

[0002]

2. Description of the Related Art In a press line for forming and processing parts such as a lead frame while continuously supplying a work,
In order to save the trouble of inserting the work into the press die, when the end of the work being fed is approaching, the supply of the work is stopped and the starting end of the new work is butt-welded to the end, and the work is welded. It is continuously supplied to the press line.

[0003] By the way, in the butt welding of the work as described above, not only the securing of the mechanical strength of the welded portion, but also the
High precision is also required in terms of the thickness and linearity of the weld.
This is because if the finishing 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. For this reason, various developments have been made on this type of workpiece joining device and joining method.
It is also in practical use.

FIGS. 12 to 16 show a butt joining apparatus for a work disclosed by the inventor of the present invention as Japanese Patent No. 2899276 earlier. In FIGS. 12 to 16, a ₁ and a _{2 are shown.} Is a work, a ₁ ′ and a ₂ ′ are cut ends,
t is the thickness of the work, ω is the butted portion of the work, L is the step, G _O is the interval between the upper clamp pieces, 1 is the cabinet body, 1a is the work table, 3 is the cutting device, 4 is the welding device, 5a · 5b is an upper clamp, 6a and 6b are work clamps, 7 is a rolling device, 8 is an operation switch panel, 9 is an operation panel panel, 10 is a caster, 11 is a foot lock device, 12 and 13 are cable reels, and 14 is for welding. Torch, 15a and 15b are lower clamps, 16a and 16b are holding guide plates, 17 is a center reference plate, 18 is a center holding plate, 20 is an electrode rod, 21 is an arc, 22a and 22b
Is a cylinder, and 24 is an arc guide screw.

[0005] With reference to FIGS. 12 to 16, work a ₁
In the butt joining of a ₂ , first, the end portion of the work a ₁ and the tip end of the work a ₂ are cut by using the cutting device 3. Next, the workpiece clamp 6a a tip of the work a ₁
And passed downward pressing guide plates 16a, after its cut edge against abutted to the side surface of the center reference plate 17 to secure the workpiece a ₁ by the workpiece clamp 6a. Similarly, after it allowed to contact the cut end surface of the workpiece a ₂ to the other side of the center reference plate 17 equivalents, to secure the workpiece a ₂ by the workpiece clamp 6b.

[0006] When the clamping of the tips of the two 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 plate 18 is fixed to the upper clamps 5a and 5
b, and inserted from above through the gap G _O between the center reference plate 17 and the concave portion 18 of the center holding plate 18.
Then, the workpiece cutting ends a ₁ ′ and a ₂ ′ are pressed onto the lower clamps 15 a and 15 b.

Thereafter, the lower clamps 15a and 15b are moved upward by the air cylinders 22a and 22b while pressing the center pressing plate 18 downward, and the workpieces a ₁ and a ₂ are moved.
And the lower clamp 15a together with the center holding plate 18.
• Lift 15b to the same horizontal position as table 1a. The lower end of the center reference plate 17 is the cabinet 1
As the lower clamp 15 is raised, the protrusion 17a of the center reference plate 17 is pulled out from the gap between the work cutting ends a ₁ ′ and a ₂ ′. Further, the leading ends of the workpieces a ₁ and a ₂ move slightly forward by a step L provided between the table 1 a and the upper surfaces of the lower clamps 15 a and 15 b, and both cut ends a ₁ ′ and a ₂ Are tightly fixed between the end bottom surfaces 5a 'and 5b' of the upper clamps 5a and 5b and the upper surfaces of the lower clamps 15a and 15b in a state where the end surfaces of the upper clamps abut exactly. still,
The center holding plate 18 held by hand is appropriately removed.

When the clamping of the workpiece cutting ends a ₁ ′ and a ₂ ′ is completed, the welding device 4 is operated by operating the switch 8 and the welding torch 14 is automatically lowered to a predetermined position. Thereby, the tip of the tungsten electrode rod 20 of the welding torch 14 is lowered to near the top of the head of the arc guide screw 24 as shown in FIG. 21 is generated. When the arc 21 is generated, the electrode rod 20 is moved at a predetermined speed in the direction of the arrow, and the generated arc 21 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 work. Continue to TI
G welding is performed.

When welding to the other end (left end) of the butting portion ω is completed, the arc 21 is stopped, and the welding device 4 is raised and then returned to the original position. When the welding of the butt portion ω is completed, the butt welding portion is moved below the rolling device 7, and the thickness of the butt welding portion is made uniform by rolling the weld portion with a roller. It is made free from A and sent to the press process.

The metal sheet butt joining apparatus according to Japanese Patent No. 2899276 can easily and accurately abut the cut end faces of both works a ₁ and a ₂ even if the work is extremely thin. Since an ideal butt joint having no partial overlap and no gap is to be welded, high-precision welding can be performed, and the generated arc 21
Since it is carried over to the end of the butted portion ω of the workpiece through the tapered portion 24a of the arc guide screw 24, the arc 2
1 has an excellent practical effect such as being unstable or having no so-called burn-through near the end of the welded portion ω.

However, there are still many problems to be solved in the butt joint apparatus of Japanese Patent No. 2899276. First, the first problem is that the adjustment of the gap G _O between the upper clamp 5a · 5b. In order to perform ideal welding, it is necessary to appropriately adjust the gap G _O between the upper clamps 5a and 5b in accordance with the thickness t of the workpiece a. In general, if the thickness t of the workpiece becomes large, When the gap G _O is widened and the thickness t of the work is reduced, the gap G _O is reduced. For example, when the thickness t of the work is 50 μm, the gap G
Optimally, _{O is set} to 0.6 mm, and when t = 0.1 to 0.5 mm, G _{O is set} to about 1.0 mm.

However, the gap G between the upper clamps 5a and 5b
To adjust _O , once loosen the fixing screws of the clamps 5a and 5b, then tighten or loosen the position adjustment screws to move the positions of the clamps 5a and 5b, and finally reset the fixing screws. It is necessary to tighten, and not only is it troublesome, but also it is extremely difficult to accurately adjust the gap G _O.

The second problem is that the arc guide screw 24 is worn. The arc guide screw 24 is formed of copper or a copper alloy. Therefore, the outer surface of the center part of the head of the arc guide screw 24 is easily damaged by the inrush current at the time of the arc start, and must be replaced every about 20 to 30 times of the arc start. Will increase.

[0014]

[SUMMARY OF THE INVENTION The present invention, said patent No. 2899276 No. of butt welding device in above-mentioned problems, i.e. it takes the trouble to adjust the gap G _O of the upper clamp 5a · 5b, the gap the exact adjustment of the G _O can be difficult, easy arc guide screw 24 is damaged, after the start arc becomes unstable, solves St. problems such that it takes labor to replace the guide screw 24 The gap G _O between the upper clamps 5a and 5b can be precisely adjusted to a desired size without any variation, and the arc guide screw 24 can be used stably for a long period of time. It is intended to provide a butt-joining apparatus for a strip-shaped thin metal plate.

[0015]

According to the first aspect of the present invention, a strip-shaped thin metal plate is cut by a cutting device, and the cut end faces are butt-fixed, and the butt portion is welded by a TIG welding device. In the joining apparatus, a cabinet main body 1 provided with a work table 1a on which a strip-shaped metal thin plate is placed, and upper clamps 5a and 5b provided opposite to each other with a gap G _O above the work table 1a. Is arranged at the center of the work table 1a so as to be able to move up and down and to be supported at the same height as the work table 1a.
A lower clamp 15 having two narrow stopper guide grooves 23a and 23b arranged side by side in a direction intersecting at an angle θ with the traveling direction of the stopper guide grooves 23a and 23b.
a stopper 2 slidably disposed and fixed in a state in which the head projects slightly upward from the upper surface of the lower clamp 15 in
6a and 26b, work clamps 6a and 6b which are provided on the work table 1a so as to be movable up and down and hold and fix both works a ₁ and a ₂ on the work table 1a, and the stopper guide grooves 23a and 23b. disposed on the lower clamp 15 located on either side of the center line l _2, two workpieces a ₁ ·
a pressing guide plates 16a · 16b for pressing and holding the leading end portion vicinity of a ₂ to lower clamp 15 above, wherein the central portion slender welding groove 29 of the width W, but also on both sides of the weld groove 29 Stopper 26a · 26b Sliding groove 30a · 3 in which the head of
0b are provided in each parallel form, wherein the lower clamp 15 stopper guide groove 23a · 23b both cut ends of the workpiece a which butt on the central line l ₂ a ₁ a '· a _2' butted portion of the ω of The setting plate 27 inserted into the upper part of the work a with the welding groove 29 positioned above and the tip part inserted below the holding guide plates 16a and 16b, and the strip-shaped metal sheet a of the lower clamp 15 ₁・ a
₂ is rotatably inserted in the vicinity of the welding start side of the butt portion ω, and the electrode rod 20 of the TIG welding device 4 is placed on the top surface of the head.
And the arc guide screw 24 for generating the welding arc 21 by positioning the tip of the arc guide screw 24.

According to a second aspect of the present invention, in the first aspect, the stopper guide grooves 23a and 2 of the lower clamp 15 are provided.
The cross angle θ between the traveling direction of the center line l ₂ and the workpiece a and 3b is obtained by approximately 100 to 110 °.

According to a third aspect of the present invention, in the first aspect, the thickness of the setting plate 27 is set to 0.4 to 0.8.
mm and the width W of the welding groove 29 is set to 0.3 to 5.0 mm.
It is intended to be.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the semicircular fitting portion 3 fitted to the outer peripheral surface of the arc guide 25 at the tip of the welding groove 29 of the setting plate 27.
1 is provided.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the stoppers 26a and 26b are provided with a tungsten material 25b at the center.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In the butt joining apparatus according to the present invention, the same parts and members as those of the joining apparatus shown in FIGS. 12 to 16 are denoted by the same reference numerals. The front view of the butt-joining apparatus for a strip-shaped metal sheet according to the present invention is the same as that shown in FIG. 1 is a longitudinal sectional view showing a main part of the present invention, FIG. 2 is a plan view of a work table portion, FIG. 3 is a plan view of a work table portion showing a state where a work a is set, and FIG. FIG. 5 is a plan view of the work table portion in a state where a plate is inserted, and FIG. 5 is a plan view of the work table portion in a welding start state.

Referring to FIG. 12 and FIGS. 1 to 5, the butt-joining device A is formed in a movable box shape, and an argon gas cylinder is provided inside the cabinet 1 provided with the work table 1a. And its accessories, welding power supply device and its control device, power supply cable reel, drive motors and drive cylinders for cutting device 3, welding device 4, rolling device 7, etc., and drive motors and drive cylinders to be described later. Are stored.

A cutting device 3, a welding device 4, and upper clamps 5a and 5b of the work are disposed movably in the front-rear direction at the back of the work table 1a of the cabinet body 1. A rolling device 7 is provided on the upper right side of the table 1a.
Work lamps 6a and 6b are provided on the outside of 5b so as to be movable up and down.

Upper clamps 5a and 5b of the work a
Are used to hold the upper surface sides of both ends a ₁ ′ and a ₂ ′ of the work, and are fed forward and upward of the table 1 a by operating the switch board 8 before welding the butted portion ω.
As shown in FIG. 1, lower clamps 15a and 15b are provided at the center of the table 1a with the upper surfaces thereof slightly lowered below the upper surface of the table 1a.
It is disposed movably downward, by pushing up the lower clamp 15a · 15b upwardly, both end portions a ₁ '· a work between the upper clamp 5a · 5b and lower clamp 15a · 15b ₂ 'is held and fixed.

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

The welding device 4 is a so-called TIG welding type welding portion. The tip position of the welding torch 20 of the welding device 4 is automatically set to a set position by operating an air switch on the operation operation switch panel 8. The workpieces a ₁ and a ₂ are linearly moved at a predetermined speed along a butt line ω at both end faces of the workpieces 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 butted portion ω is completed, the welded portion is positioned on the receiving plate, and the rolling roller to which the downward pressing force is applied is moved in the front-rear direction along the welded portion, thereby forming the welded portion. Press to make its thickness uniform.

FIG. 1 is a longitudinal sectional view showing a main part of a butt joining apparatus A. In FIG. 1, 1a is a work table, 5a and 5b are copper work upper clamps, 6a and 6
b is a work clamp, 14 is a welding torch, 15a · 1
5b is a copper work lower clamp, 16a and 16b are steel holding guide plates, 17 is a thin steel center reference plate, 1
8 is a center holding plate, 19 is a square hole formed in the work table 1a, 20 is an electrode rod, 21 is an arc, 22
a and 22b are air cylinders, 25 is an arc guide, 2
6a and 26b are stoppers, and 27 is a setting plate.

The work table 1a is formed horizontally at an intermediate portion on the front side of the cabinet 1. A rectangular hole 19 is provided in the center of the work table 1a, and the lower clamp 15a
15b is about 3 to 3 by air cylinders 22a and 22b.
It is arranged to be able to move up and down with a stroke of about 6 mm. In this embodiment, the lower clamps 15a and 15b are divided.
Needless to say, it may be.

The 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, the tip end portions of the upper clamp 5a · 5b is with a cross-sectional shape 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' Then, the upper surfaces of the tips of the workpieces a ₁ and a ₂ are held and fixed. In the present embodiment, the upper clamp 5a-5b, the horizontal movement only in the longitudinal direction without moving the upper and lower direction, of the work a _{1-a 2} as a clamp, a forward by operation of the switch panel 8 It is moved to a position above the hole 19 and is held in a horizontal posture. The upper clamp 5a
The lower surface of 5b is held at a level higher than the upper surface of table 1a by the thickness of setting plate 27 described later.

Each of the lower clamps 15a and 15b is a thick flat plate 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 15b
In the normal state (when the air cylinder is not operated), the upper surface is arranged and held such that the upper surface thereof is located at a distance L = about 2 to 4 mm lower than 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. 1 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 via a setting plate 27 described later. Note that 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.

As shown in FIG. 2, narrower stopper guide grooves 23a and 23b are formed in the lower clamps 15a and 15b in parallel on both sides of the butted portion ω of the work a. A stopper 26a having a structure as shown in FIGS. 6 and 7 is provided in the guide grooves 23a and 23b.
26b is inserted movably in the front-rear direction with the head protruding upward from the upper surfaces of the lower clamps 15a and 15b by the thickness of the setting plate 27, and is fixed by tightening the fixing screw 34.

As shown in FIG. 1, a center reference plate 17 made of a thin steel plate having a thickness of about 0.1 to 0.3 mm is provided between the lower clamps 15a and 15b. When both lower clamps 15a and 15b are lifted upward, the lower clamps 15a and 15b are pulled inward.

[0033] The holding guide plates 16a · 16b are band-like short steel having a thickness of about 2 to 3 mm, are arranged in positions on either side of the center line l ₂ of the stopper guide groove. Base ends (rear) of the presser guide plates 16a and 16b
Is fixed to the lower clamp 15, and a slight gap is formed between the front end of the lower clamp 15 and the upper surface of the lower clamp 15 for inserting the workpieces a ₁ and a ₂ . In addition, work a ₁
When welding a ₂ , as described later, both guide plates 1
The tips of the workpieces a ₁ and a ₂ are inserted below 6 a and 16 b, and then the workpiece cutting ends a ₁ ′ and a ₂ ′ are finely positioned. Further, the guide plates 16a and 16b are provided with long holes 28 in order to enhance their spring properties.

The setting plate 27 is provided with lower clamps 15a, 15a to adjust the gap G _O between the upper clamps 5a, 5b according to the thickness of the work a.
It is inserted between the upper part of the workpiece a butted on the upper part b and the upper clamps 5a and 5b. FIG.
9 is a plan view and a side view of the setting plate 27, and has a thickness of 0.4 mm such as SUS, BsBM, or Cu.
It is formed in a substantially square shape from a thin plate of about 0.8 mm. That is, the width W is set at the center of the setting plate 27.
Is provided with a narrow width welding groove 29 of about 0.3 to 5 mm, and on both sides of the welding groove 29, stopper guide grooves 23a / 2 of the lower clamps 15a / 15b.
Sliding grooves 30a and 30b into which the heads of the stoppers 26a and 26b fixed in 3b are fitted are formed. Furthermore,
A fitting portion 31 that contacts an outer peripheral surface of an arc guide 25 described later is provided at a deep portion of the welding groove 29 (that is, on a welding start point side).
Are formed.

The width W of the welding groove 29 is related to the thickness t of the work a, and when the thickness t = 50 μm, W =
W = 1.0 when 0.6 mm and t = 0.1 to 0.2 mm
mm, W = 1.0 mm when t = 0.2 to 0.5 mm,
When t = 1 mm, W is selected to be 5.0 mm.

The material of the setting plate 27 is appropriately selected depending on the material of the work, the temperature of the welded portion, and the like.
When it is necessary to keep the heat conduction during welding low, a stainless steel plate is used. Further, the fitting portion 3 in FIG.
Between the center O ₁ of 1 and the center line l ₁ of the welding groove 29, the inner diameter φ of the fitting portion 31 is a 12.0mm and welding groove 2
The crossing angle θ between the center line l _{1 of No.} 9 and the traveling direction of the workpiece a is 1
At 00 °, a deviation D of about 1.2 mm is provided. This is because if the deviation D is not provided, both cut ends a
Welding start side end portion of the joint ₁ '· a _2' are, because not contact tangentially to the outer surface of the arc guide 25.

The arc guide 25 is formed of a copper material. A cylindrical tungsten material 25b is formed at the center of a copper main body 24a having an outer diameter of 12 mm as shown in FIGS.
Is fixed, and an extraction hole 25c is provided on the upper surface side.
Also, a fixing screw hole 25d for tungsten material is provided on the side surface. The arc guide 25 is connected to the lower clamp 1.
5 is rotatably inserted into a hole 35 provided at the end of the butt portion ω of the two workpieces a ₁ and a ₂ on the welding start side, and is engaged by a locking mechanism (not shown) using a ball. It is held so that it does not easily jump upward. When the arc guide 25 is taken out, the take-out hole 25c is required.
Fit the special jig and pull it up. The head of the arc guide 25 is formed in a flat shape,
The outer peripheral portion is provided with a tapered surface 25a. The height H 'of the arc guide 25 is appropriately selected between 10.2 to 10.8 mm according to the thickness t of the workpiece a.

For example, when the thickness t of the workpiece a is 0.2 mm
Sometimes, as shown in FIG.
The head height of the electrode rod 2 is adjusted by operating the welding torch 14.
0, the head top surface and the tip of the electrode rod 20
Distance S between₁Is adjusted to be 0.1 to 0.2 mm.
And the side of the arc guide 24 and the workpiece a ₁
・ A_TwoDistance S between_TwoIs 0.2 to 0.3 mm
Kua₁・ A_TwoS between the electrode and the tip of the electrode rod 20_ThreeIs 0.
Each is set to 3 to 0.7 mm. In addition, each said distance
S₁, S_Two, S_ThreeDepends on the thickness t of the workpiece a.
Needless to say, it is adjusted appropriately.

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 operated by a cylinder 32 as shown in FIG. 1, and a pressing claw body 33 is supported and fixed to a piston of the cylinder 32.

Next, the operation of the joining apparatus according to the present invention will be described. First, as shown in FIG. 2, the positions of the stoppers 26a and 26b in the stopper guide grooves 23a and 23b are adjusted in accordance with the width of the work a, and the stoppers are fixed by fixing screws. Next, as shown in FIG.
Guide plates 16a · 1 pressing both cutting edges a ₁ '· a _2' of
The work a is fixed by being inserted below the base 6b so as to contact both ends of the center reference plate 17 and operating the work clamps 6a and 6b.

Thereafter, as shown in FIG. 4, the setting plate 27 is placed above the lower clamps 15a and 15b, and the stopper 26a is inserted into the sliding grooves 30a and 30b.
Fitting the head of 26b and fitting part 3 at the tip
1 is brought into contact with the outer peripheral surface of the arc guide 25.

Next, as shown in FIG.
To a position above the lower clamps 15a and 15b.
After that, the cylinder 2 of the lower clamps 15a and 15b
Activate 2a / 22b and lower clamps 15a / 15b
Is moved upward (see FIG. 1). As a result,
The center reference plate 17 has both cut ends a of the work a.₁'
a _Two′ And the lower clamp
Between work 15 and upper clamps 5a and 5b.
Both cut ends a₁'・ A_Two′ With the end faces in contact
It is clamped and held.

With the above operations, the preparation for butt welding of the workpieces a ₁ and a ₂ is completed.
G weld. Before the lower clamps 15a and 15b are lifted upward by the cylinders 22a and 22b,
As shown in FIG. 15, the distance G _O between the upper clamps 5a and 5b
The center holding plate 18 is vertically inserted through the lower end of the center holding plate 18, and the lower clamp 15 is pressed while pressing both cut ends a ₁ ′ and a ₂ ′ of the work a toward the lower clamp 15. The center reference plate 17 is pulled out from between the two cut end faces, and both cut ends a ₁ ′ and a ₂ ′ are clamped and held between the lower clamp 15 and the upper clamps 5a and 5b. Next, after the holding plate 18 is removed, it is a matter of course that the butt portion ω of the work a may be joined by TIG welding.

At the time of TIG welding, first, the electrode rod 20
5 is opposed to a tungsten material 25b provided at the center of the arc guide 25 as shown in FIG. 5, and an initial arc is generated between the tungsten material 25b and the tungsten material 25b. afterwards,
The electrode rod 20 is moved at a predetermined speed along the butted portion ω of the work a. As a result, the initial arc 21 is carried over to the butt portion ω via the tapered surface of the arc guide 25, and excellent butt welding without so-called burn-through is performed.

The arc guide 25 includes a lower clamp 15.
As in the case of FIG. 16, the head is inserted into the arc guide insertion hole 35 provided above with the head protruding upward by a predetermined dimension S ₁ , and the setting position of the arc guide 25 is rotated. By moving the head, the entire surface of the top of the head is effectively used as a movement path of the initial arc.

Further, the center position O of the insertion hole 35 of the arc guide body 25 provided in the lower clamp 15 and the center line l ₁ of the welding groove 29 of the setting plate 27 (that is, the center line l ₂ of both stopper guide grooves). 2, a deviation D of about 1.2 mm is provided as shown in FIG. By providing this deviation D, the outer diameter of the arc guide 25 becomes 12
mm and the inclination angle θ of the butted portion ω of the workpiece is 100
When the angle is between 110 ° and 110 °, the tip of the butting portion ω just comes into contact with the outer peripheral surface of the arc guide 25 in a tangential manner, and the initial arc 21 is more smoothly transferred from the arc guide 25 onto the butting portion ω. Can be done.

[0047]

According to the present invention, a welding groove 29 having a predetermined lateral width W is provided at the center of the workpiece a above the abutting portion ω of both cut end faces, and sliding grooves 30a and 3 are provided on both sides thereof.
0b are formed in parallel, and a setting plate 27 made of a thin metal plate is inserted.
Upper clamps 5a and 5b and lower clamp 15a through
・ 15b and the contact part ω of both works a ₁・ a ₂
Are sandwiched. As a result, the upper clamp 1
Spacing G _O of 5a · 15b is the Setteingu plate 2
7 is regulated by the lateral width W of the welding groove 29, and the adjustment of the upper clamp interval G _{O in} TIG welding is compared with the case where the interval G _O between the conventional upper clamps 15a and 15b is directly adjusted. Becomes extremely easy.

Further, stopper guide grooves 23a and 23b are provided in the lower clamps 15a and 15b, and the stopper 26 is movably moved into the stopper guide grooves 23a and 23b.
a and 26b, and the stopper 26a is inserted into the sliding grooves 30a and 30b of the setting plate 27.
• The head of 26b is fitted. As a result, when the setting plate 27 is inserted above the butted portion ω of the work a, the position of the setting plate 27 can be easily regulated.
Moreover, it is possible to carry out extremely accurately.

Further, in the present invention, the initial arc 21
Since the arc guide 25 for generating the arc guide has a structure in which the tungsten material 25b is provided at the center, the service life of the arc guide 25 is greatly extended, and semi-permanent use is possible. The present invention has excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a butt joining apparatus according to the present invention.

FIG. 2 is a schematic plan view showing a work table portion.

FIG. 3 is a schematic plan view showing a state where a work is set on a work table.

FIG. 4 is a schematic plan view showing a state in which a setting plate is inserted above an abutting portion ω of a work.

FIG. 5 is a schematic plan view showing a state in which an upper clamp has been moved onto a setting plate.

FIG. 6 is a plan view of a stopper.

FIG. 7 is a sectional view of a stopper.

FIG. 8 is a plan view of a setting plate.

FIG. 9 is a cross-sectional view of a setting plate.

FIG. 10 is a plan view of the arc guide.

FIG. 11 is a sectional view of an arc guide.

FIG. 12 is a front view of a conventional butt joining apparatus.

FIG. 13 is a schematic plan view of a work butt portion of the butt joining device.

FIG. 14 is a longitudinal sectional view showing a main part of the butt joining device.

FIG. 15 is an enlarged cross-sectional view showing a state in which a center holding plate is inserted into a butted portion of a work.

FIG. 16 is a schematic cross-sectional view taken along the line E in FIG. 13;

[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, the step between the lower clamp 15, G _O is the distance between the upper clamp pieces, θ is the intersection angle, W is the width of the welding groove, l ₁ is the center line of the welding groove, l ₂ is the center line of both stopper guide grooves, H '
Is the height of the arc guide, 1 is the cabinet body, 1a is a work table, 2 is a welding gas cylinder, 3 is a cutting device, 4 is a welding device, 5a and 5b are upper clamps, 5a '.
5b 'is the bottom of the tip, 6a and 6b are the work clamps,
7 is a rolling device, 8 is an operation switchboard, 9 is an operation panel, 10 is a caster, 11 is a foot lock device, 12
13 is a cable reel, 14 is a torch for welding, 15a
15b is a lower clamp, 16a and 16b are holding guide plates, 17 is a center reference plate, 18 is a center holding plate, 1
9 is a square hole of a work table, 20 is an electrode bar, 21 is an arc, 22a and 22b are air cylinders, 23a and 23
b is a stopper guide groove, 25 is an arc guide, 25a
Is a copper body, 25b is a tungsten material, 25c is an extraction hole, 25d is a tungsten material fixing screw hole, 26a
26b is a stopper, 27 is a setting plate, 2
8 is a long hole, 29 is a welding groove, 30a and 30b are sliding grooves, 3
1 is a fitting portion, 32 is a cylinder, 33 is a claw body, 34 is a stopper fixing screw, and 35 is an insertion hole of an arc guide.

Claims (5)

[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 ( 1a) is arranged at the center of the work table so as to be movable up and down and supported at the same height as the work table (1a). A lower clamp (15) having stopper guide grooves (23a) and (23b) having a width in parallel, and a lower clamp (1) provided in each of the stopper guide grooves (23a) and (23b).
5) Stoppers (26a) and (26) slidably disposed and fixed with the head slightly projecting upward from the upper surface.
b) and a work clamp (6a), which is vertically movable on the work table (1a) and holds and fixes both works (a ₁ ) and (a ₂ ) on the work table (1a).
(6b), the stopper guide grooves (23a) and (2)
3b) is disposed on the lower clamp (15) at both sides of the center line (l ₂ ), and presses the vicinity of the tip of both works (a ₁ ) and (a ₂ ) onto the lower clamp (15). The holding guide plates (16a) and (16b) to be held, a narrow welding groove (29) having a width (W) in the center, and a welding groove (2) are provided.
Sliding grooves (30a) and (30b) into which the heads of the stoppers (26a) and (26b) fit are provided in parallel on both sides of 9), respectively, and stopper guide grooves (15) of the lower clamp (15). 23a) and (23b), both cut ends (a ₁ ') of the work (a) butted on the center line (l ₂ ) of the work (a).
Above the butted portion (ω) of (a ₂ ′), the welding groove (2)
9), and the setting plate (2) inserted into the upper part of the work (a) with the leading end inserted below the presser guide plates (16a) and (16b).
7) and the workpieces (a ₁ ) and (a) of the lower clamp (15)
₂ ) It is rotatably inserted in the vicinity of the welding start side of the butt portion (ω), and the tip of the electrode rod (20) of the TIG welding device (4) is positioned on the top surface of the head to perform welding. Arc (2
An arc guide (25) for generating 1), the butt joining apparatus for a strip-shaped metal sheet. 2. A crossing angle θ between the center line (l ₂ ) of the stopper guide grooves (23a) and (23b) of the lower clamp (15) and the traveling direction of the work (a) is set to about 100 to 110 °. Item 2. The apparatus for butt-joining strip-shaped metal sheets according to Item 1. 3. The thickness of the setting plate (27) is set to 0.4 to 0.8 mm, and the width (W) of the welding groove (29) is set to 0.3 to 5.0 mm.
3. The butt-joining apparatus for a strip-shaped metal sheet according to item 1. 4. A semicircular fitting portion (31) fitted to the outer peripheral surface of an arc guide (25) is provided at a tip end of a welding groove (29) of a setting plate (27). 3. The butt-joining apparatus for a strip-shaped metal sheet according to item 1. 5. The stoppers (26a) and (26b)
2. The butt-joining apparatus for strip-shaped thin metal sheets according to claim 1, wherein a tungsten material (25b) is provided at the center.