JP2624546B2 - Method and apparatus for joining strip-shaped metal plates - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for joining metal strips, and more particularly, to a method for joining metal strips to join flexible metal strips together. It relates to a joining device.

[Conventional technology]

In the case of joining conventional strip-shaped metal plates together, as shown in FIG. 3, a method of superposing the strip-shaped metal plates 70 and 72 and bonding the bonding surface 73 with a double-sided adhesive tape, or by ultrasonic bonding (Japanese Unexamined Patent Application Publication No.
As shown in FIG. 4 and FIG.
A method of adhering the two butted portions 75 with single-sided adhesive tapes 76, 76 is adopted (Japanese Patent Laid-Open No. 59-24526).

However, in the method of joining strip-shaped metal plates shown in FIGS. 3 and 4, there is a problem that the joining portion has a step, so that it cannot be smoothly contacted with a pass roller or the like, or that the sheet passes through a coating device in a photosensitive layer coating step. There is a problem that the application device must be retracted so that the time step does not contact the application device.

In order to solve this problem, there has been proposed a joining method in which strip-shaped metal plates are welded to each other, and the joint is rolled to remove a step. In this method, as shown in FIG. 5, after superposing a small amount of the band-shaped metal plates 70 and 72 on the back bar 80,
The shield gas 84 is blown to the upper and lower surfaces of the minutely overlapped portion, and the shielded gas 84 is used to perform arc welding of the minutely overlapped portion while preventing the electrode 86 and the joint 88 of the welding torch 85 from being oxidized. The part 88 is rolled to remove a step at the joint part 88. In this case, the shielding gas is blown out from the welding torch on the upper surface of the minute overlapping portion,
On the lower surface, shielding gas 84 from holes 90, 90 ... of back bar 80
Is blown out.

However, since it is difficult to uniformly blow out the shielding gas 84 from the holes 90, 90... Of the back bar 80, the blowing pressure of the shielding gas varies, and when the thin plate is melted up to the back surface (back wave welding), a location where the blowing pressure is strong. There is a problem that perforations occur. In FIG. 5, reference numeral 91 denotes a clamp.

In order to solve this problem, the applicant of the present invention has proposed a joining method of a strip-shaped metal plate in which the strip-shaped metal plates are joined to each other by back-wave welding without blowing out a shielding gas from the holes 90 of the back bar. I have. (Japanese Patent Application No. 63-304379) The arc generated on the electrode 86 is about
Since 0.1 seconds to several seconds are necessary, if the strip-shaped metal plates are welded and joined immediately after the arc is generated, the strip-shaped metal plates are welded and joined with an arc larger or smaller than a set value. Therefore, there is a problem that melting may occur at the welding start end, poor melting, or unmelting may occur.

Further, when the arc is unstable, it is liable to cause non-uniformity of beads at the time of welding and joining a thin strip-shaped metal plate, and there is a problem that a hole is formed due to poor melting and a poor appearance (loss of glossiness) is caused.

In order to solve this problem, the present applicant separates the electrodes from the strip-shaped metal plate to generate an arc, and the arc is generated from the time when the arc is generated.
Japanese Patent Application No. 1-20534 proposes a joining method of a band-shaped metal plate in which a joining portion of the band-shaped metal plate is welded after a lapse of at least two seconds.

In addition, as shown in FIG.
Moves in the direction of arrow A and reaches the strip-shaped metal plates 70 and 72, the arc length sharply decreases from L to L '.
If the tip of the electrode 86 is sharply formed, the arc becomes unstable. For this reason, it is not possible to sufficiently reverse weld the strip-shaped metal plates 70 and 72 to each other, causing poor fusion at the welded joint at the welding start end, or causing the welded joint to melt down due to excessive arc heat and cause a hole. There is a problem that air gap occurs. Also, since the arc length increases sharply from L 'to L even at the welding end, there is a problem similar to that at the welding start.

In order to solve this problem, the present applicant has proposed a joining method of a strip-shaped metal plate in which the tip of an electrode is formed into a hemispherical shape or a flat surface having a diameter of 0.3 mm or more and is subjected to arc welding (Japanese Patent Application No. Hei 10-26139). No. 1-32292, Japanese Patent Application No. 1-333313).

[Problems to be solved by the invention]

However, Japanese Patent Application No. 63-304379, Japanese Patent Application No. 1-3229
No. 2, Japanese Patent Application No. 1-20534 and Japanese Patent Application No. 1-331313, the method of joining strip-shaped metal plates involves dust, paper debris, thread debris, cutting debris of the strip-shaped metal plate, and fumes generated by welding at the welded portion. When there is a foreign substance such as the above, there is a problem that the foreign substance cannot be removed, so that a hole is generated due to the burning of the foreign substance.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bonding method and a bonding apparatus for a band-shaped metal plate, which can prevent a hole due to burning of foreign matter such as dust.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a method of joining a strip-shaped metal plate in which ends of a strip-shaped metal plate are welded to each other by a welding device, and the welded joint is rolled by a rolling device. A suction device that is disposed at a predetermined distance in front of a welding direction of the welding device that moves along a joint to be welded and welds the joint and that moves integrally with the movement of the welding device. Is moved prior to the movement of the welding device, and after the dust or the like before welding that adheres to the joining portion is suctioned by the suction device, welding is performed by the welding device.

[Action]

According to the present invention, the relationship between the welding device and the suction device is configured so that the suction device moves integrally with the welding device prior to the welding device moving along the joint, and the relationship exists between the welding device and the joint to be welded. Immediately after the foreign matter such as dust to be removed is removed by the suction device, welding can be performed immediately after that, so that the foreign matter such as dust can be welded in a state where foreign matter such as dust is surely removed from the welding portion of the joint.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for joining strip-shaped metal plates according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a method for joining a strip-shaped metal plate according to the present invention. As shown in FIG. 1, the strip-shaped metal plate 10 is rolled.
The joining device 16 is rewound from the roller 12 and is rolled on the path roller 14.
Transported to The pre-cut device 18 of the joining device 16 is a cutter
It consists of 20, 20. The tip 10A of the strip-shaped metal plate 10 is
It is cut by the pre-cut device 18 and formed so as to be able to accurately abut against or slightly overlap a rear end portion 22A of the strip-shaped metal plate 22 to be joined. Note that the precut device 18 is not used when the front end portion 10A of the strip-shaped metal plate 10 to be rewound can be abutted against or slightly overlapped with the rear end portion 22A without cutting.

A welding device 24 is provided downstream of the pre-cut device 18, and the welding device 24 mainly includes a welding torch 30, a suction nozzle 32, and a blowing nozzle 34, as shown in FIG. The welding torch 30 is mounted on the left side of the traveling unit 36, and the traveling unit 36 is supported by the welding device 24 so as to be movable in the left-right direction in FIG. The suction nozzle 32 is provided on the right side of the traveling unit 36. The suction nozzle 32 has a supply pipe 38 for supplying compressed air and an exhaust pipe for exhausting the supplied air.
40 are provided. Therefore, when compressed air is supplied from the supply pipe 38 and exhausted from the exhaust pipe 40, a suction force is generated in the opening 32A of the intake nozzle 32. The blowing nozzle 34 is located on the right side of the suction nozzle 32 in FIG. 2, and is attached to the traveling unit 36 via a member (not shown). Blow nozzle 34
Is provided with a supply pipe 42 for supplying compressed air to the blowing nozzle 34. The blow-out nozzle 34 is provided to float or blow off foreign matters fixed to the ends of the strip-shaped metal plates 10 and 22. Use this function as needed.

When welding the end portions of the strip-shaped metal plates 10 and 22 with the welding device 24, first, a very small amount of the front end portion 10A of the strip-shaped metal plate 10 and the rear end portion 22A of the strip-shaped metal plate 22 are attached to the back bar 44. Overlap and fix the tips 10A and 22A with clamps (not shown). Next, a high-frequency pulse arc is generated from the electrode 30A of the welding torch 30, and compressed air is supplied to the supply pipe 38 to generate a suction force on the suction nozzle 32.
The compressed air is also supplied to 42 and the compressed air is blown out from the blowing nozzle 34. In this state, when the traveling unit 36 is moved in the right direction (the direction of arrow A) in FIG. 2, the blowing nozzle 34, the suction nozzle 32, and the welding torch 30 in the order of the end portions 10 of the strip-shaped metal plates 10, 22.
As it moves along the small-amount overlapping portion of A and 22A, foreign matter such as dust stuck to the minute-amount overlapping portion of the end portions 10A and 22A is lifted by compressed air blown out from a blowing nozzle as needed. The arc welding can be performed after the foreign matter left in the overlapping portion is sucked or blown off by the suction nozzle.

As described above, since the welding torch 30, the suction nozzle 32, and the blowing nozzle 34 are integrated, foreign matter can be removed immediately before welding and joining. Therefore, the probability that foreign matter accumulates in the minutely overlapped portions of the strip-shaped metal plates 10 and 22 is reduced, so that holes are not generated in the minutely overlapped portions during arc welding. Further, harmful substances such as fumes generated by welding can be removed.

A rolling device 48 is provided at a stage subsequent to the welding device 24, and a rolling roller 50 of the rolling device 48 performs rolling of a welded joint between the end portions 10A and 22A of the strip-shaped metal plates. By such a rolling process,
The step generated at the weld joint is pressed and compressed. This rolling process increases the bonding strength. This is because the tensile strength reduced by welding is work-hardened and recovered by the rolling process, and at the same time, it can be processed into a shape that does not easily cause stress concentration.

In the above embodiment, the band-shaped metal plate 10 and the band-shaped metal plate 22 are overlapped by a small amount, but they may be butt-welded. Although high-frequency pulse arc welding is used, joining may be performed by TIG arc welding. Further, although the suction nozzle is of an ejector type using compressed air, a vacuum pump or a suction blower may be used. The apparatus according to the present invention can also be used as a continuous welding apparatus such as a pipe making line.

Next, a description will be given of a method of joining a strip-shaped metal plate and a test of a joined portion joined by a joining apparatus according to the present invention.

The test conditions were a compressed air pressure of 4 kg / cm ² and a welding speed of 6 m / cm.
Min, shield gas flow rate from welding torch Ar2 / min, He1
0 / min, distance between suction nozzle, air blowing nozzle and butt or micro overlapped part 20mm, distance between welding torch and suction nozzle 190mm, distance between suction nozzle and air blowing nozzle 7
5 mm.

 Table 1 shows the results of welding under these conditions.

From Table 1, it was found that there was no problem in the welding result when the suction nozzle was used and when the suction nozzle and the blowing nozzle were used.

Next, for Test Nos. 1, 2 and 4 in Table 1, the plate thickness was 0.24 m.
An aluminum alloy strip having a thickness of m, a width of 1000 mm, a thickness of 0.10 mm, and a width of 1000 mm was welded 10 times each, and the traces of foreign matter burning and the presence or absence of holes due to foreign matter burning were examined. Table 2 shows the results.

From Table 2, it was found that Test Nos. 1 and 2 did not cause foreign matter burning marks or holes in the welded joint.

〔effect〕

As described above, according to the method and the apparatus for joining strip-shaped metal plates according to the present invention, after removing foreign matter at the butt portion or the minutely overlapped portion of the strip-shaped metal plates, welding and joining are performed. No holes are created by burning foreign matter. Therefore, the quality can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method of joining a strip-shaped metal plate according to the present invention,
FIG. 2 is an enlarged view of a main part of the joining apparatus according to the present invention, FIG. 3 is a perspective view showing a conventional lap joining method, FIG. 4 is a perspective view showing a conventional butt joining method, FIG. FIG. 6 is an enlarged view of a main part of a welding device used in a conventional joining method. 10, 22 ... strip metal plate, 16 ... joining device, 18 ... pre-cut device, 24 ... welding device, 30 ... welding torch, 32 ...
Suction nozzle, 34 ... Blowing nozzle, 48 ... Rolling machine, 50 ...
... rolling rollers.

Claims (2)

(57) [Claims] In a method for joining strip metal plates, the ends of the strip metal plates are welded and joined by a welding device, and the welded joints are rolled by a rolling device. A suction device, which is arranged at a predetermined distance in front of the welding direction of the welding device for welding and joining the joint by moving along the joint and moves integrally with the movement of the welding device, is used for moving the welding device. A method for joining strip-shaped metal plates, wherein the welding device is moved forward, and the suction device sucks dust and the like before welding adhered to the joining portion, and then welds with the welding device. 2. A joining apparatus for a strip-shaped metal plate, comprising: a welding device for welding end portions of the strip-shaped metal plates to each other; and a rolling device for rolling a welded joint portion. A suction device that moves along the portion and that is integrated with the movement of the welding device at a predetermined distance in front of the welding direction of the welding device that welds and joins the joining portion; A welding device for a strip-shaped metal plate, wherein after welding dust or the like adhering to a portion, suction is performed by the welding device.