JPH0767638B2 - Method of joining strip metal plates - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for joining strip-shaped metal plates, and more particularly to a joining method for joining flexible strip-shaped metal sheets.

[Prior art]

As a method of joining the strip-shaped metal plates, there are a method of superposing the strip-shaped metal plates and a method of joining them by abutting.

As shown in FIG. 5 (a), in the conventional lap joining method, the strip metal plate 70 and the strip metal plate 72 are superposed,
The joining surface 73 is joined with a double-sided adhesive tape or is fused by ultrasonic waves (FIGS. 4 and 6 of JP-A-59-24526).

Further, FIG. 5 (b) is a perspective view showing a conventional butt joining method for band-shaped metal plates. As shown in FIG. 5 (b), the ends of the strip-shaped metal plates 70 and 72 are butted, and the butted joint 75 is joined by the upper and lower single-sided adhesive tapes 76 and 76 (JP-A-59-24526). (Fig. 2).

However, according to the conventional joining method of the band-shaped metal plates as shown in FIG. 5 (a), since there is a step at the joining portion, it is not possible to make smooth contact with the pass roller or the like. In addition, the thickness of the joining portion is larger than the thickness of the strip plate, and the overlapping portion is often not joined over the entire surface, so that the overlapping portion may be turned over during the transportation of the strip plate. In addition, there is a problem of contact with other objects during transportation in the process. Further, when there is a surface treatment step of the strip-shaped metal plate using the treatment liquid in the process, when the strip-shaped metal plate passes through the treatment liquid, foreign matter such as the treatment liquid enters the gap of the overlapping portion, In some cases, it may cause quality defects in the subsequent process. Moreover, various problems occur in the surface treatment process of the strip-shaped metal plate. For example, in the photosensitive layer coating step in lithographic printing plate manufacturing,
The coating device must be retracted to prevent damage when the joint portion of the strip-shaped metal plates passes. Further, even when the coating device is not retracted, such a superposed joint surface 73 has a step, which adversely affects the coating state and causes poor quality.

Further, as shown in FIG. 5B, in the joining method by abutting, since the single-sided adhesive tapes 76, 76 are used for joining, the joining portion 75 has a step difference in thickness due to the tapes 76, 76. This step causes a problem similar to the problem in the lap joining method shown in FIG. In particular, in the case of this method, the tapes 76, 76 of the abutting portion are displaced by the edge of the strip plate of the abutting portion while being conveyed by a pass roller or the like during the process, so that the strength becomes weak and the problem of easy cutting occurs. There was a point. Furthermore, the strip-shaped metal plates 70, 72 are
Bending stress is applied when passing through the pass roller, and the bending stress easily causes breakage in the joint portion 75. In particular, it occurs remarkably when a thin strip-shaped metal plate of 0.1 mm to 0.2 mm is used or when there is a large difference in thickness between the two strip-shaped metal plates to be joined.

A method of joining strip-shaped metal plates that solves such a problem is disclosed in Japanese Patent Application Laid-Open No. 01-27776. According to the disclosed method, as shown in FIG. 6, the end faces of the strip-shaped metal plate 70 and the strip-shaped metal plate 72 are butt-welded or overlapped with each other by a small amount and welded, and the welded portion 78 is rolled to weld the welded portion. Both ends of 78
It is characterized by trimming A. As a result,
Since the stress concentration of the welded portion 78 can be reduced, the welded portion 78 does not break.

Further, as shown in FIGS. 7 (a) and 7 (b), when the narrow strip metal plate 82 and the large strip metal plate 84 are welded and joined, both end portions of the joint portion 80 and the large and end portions are trimmed. To do.

[Problems to be solved by the invention]

However, when metal plates with different width dimensions are butt-joined, the strength can be greatly improved by significantly trimming the end portions of the strip-shaped metal plates in a taper shape, but large tension is applied to more complicated steps. In order to carry it while receiving it, it was necessary to further increase the strength.

The present invention has been made in view of such circumstances, and even when the strip-shaped metal plates having different width dimensions are butt-joined or welded together by superimposing a small amount, the joining portion does not break in a short time. The purpose is to propose a method.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is to weld a large strip-shaped metal plate and a narrow strip-shaped metal plate by abutting or superimposing a small amount on each other, rolling the welded joint, and joining the end portion of the joined large strip-shaped metal plate. Is subjected to a trimming process so as to form a direct part having the same width as the narrow band metal plate. The length of the linear part is preferably 10 mm or more, and more preferably 50 mm or more.

[Action]

According to the joining method of the strip-shaped metal plate according to the present invention, the large strip-shaped metal plate and the narrow width strip-shaped metal plate are welded by abutting or overlapping by a small amount, and the end portion of the large strip-shaped metal plate is connected to the narrow strip-shaped metal plate. Since the linear portions having the same width are formed, the joint portion between the strip-shaped metal plates does not break during the carrying process.

〔Example〕

Hereinafter, preferred embodiments of a method for joining strip-shaped metal plates according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view of a method for joining strip-shaped metal plates according to the present invention. As shown in FIG. 1, the strip-shaped metal plate 10 is rewound from the roll 12, rolled on the pass roller 14, and conveyed to the joining device 16. The precut device 18 of the joining device 16 includes cutters 20 and 20, and the tip portion 10A of the strip-shaped metal plate 10 has a precut device 18
The rear end 22 of the strip-shaped metal plate 22 that is cut and joined by
It is formed so that it can be accurately abutted with or superposed on a minute amount. The tip of the strip-shaped metal plate 10 to be rewound
If 10A can be directly abutted on the rear end 22A of the strip-shaped metal plate 22 or superposed by a small amount, a precut device
18 is not used.

A welding device 24 is provided downstream of the precut device 18, and the welding device 24 includes clamps 26 and 28 and a welding torch 30. The clamp 26 holds the tip 10A of the strip-shaped metal plate 10, the clamp 28 holds the rear end 22A of the strip-shaped metal plate 22, and the strip-shaped metal plate 10 and the strip-shaped metal plate 22 are abutted or superposed on each other in a minute amount. A TIG arc welding method is adopted for the welding torch 30, and other than this welding torch 30, MIG arc welding, gas welding, laser welding of CO ₂ , YAG or the like may be used. The welding torch 30 melts and welds the end portions 10A, 22A of the strip-shaped metal plates while moving in the width direction of the strip-shaped metal plates 10, 22 from above the butted or small amount superposed portions.
Further, particularly when the thickness of the strip-shaped metal plates 10 and 22 is 0.3 mm or less, the strip-shaped metal plates 10 and 22 are easily melted, so that the strip-shaped metal plate ends 10A and 22A are slightly overlapped and welded. To be done.

A rolling device 32 is provided after the welding device 24.
32 is composed of a rolling roller 34 and a back bar 36, and the welding portion 40 between the strip-shaped metal plate 10 and the strip-shaped metal plate 22 is rolled by the operation of the rolling roller 34.

Further, an edge trimming device 42 is provided at the subsequent stage of the rolling device 32, and the pair of die sets 4 of the edge trimming device 42 are provided.
The welded portions of the narrow band-shaped metal plate 10 and the large band-shaped metal plate 22 are moved between 4 and 44, and the large band-shaped metal plate 22 is trimmed together with the welded part into a straight line portion and a taper portion described later. This trimming is performed by positioning the die sets 44, 44 in the width direction of the welded portion and punching out only the end portion of the largely strip-shaped metal plate 22. Further, if necessary, the narrow strip metal plate 10 and the end portion 46 of the welded part may be punched together. In addition to this punching method, a method using a running notcher, a laser cutting method, an air plasma cutting method, or the like may be used. After trimming in this way, the strip-shaped metal plate is sent to the coating process.

FIG. 2 (a) is a plan view in which the narrow strip metal plate 10 rewound from the roll 12 is joined to the large strip metal plate 22 by using the strip metal plate joining method according to the present invention. 2B is a plan view in which the narrow strip metal plate 22 is joined to the large strip metal plate 10 which is rewound in the opposite direction. As shown in FIG. 2 (a), the edge of the large strip metal plate 22 is an edge trimming device.
Edge trimming is performed by 42 so as to form a linear portion A having the same width as that of the narrow strip metal plate 10 and a tapered portion B. Also in FIG. 2 (b), a straight line portion A and a taper portion B are formed as in FIG. 2 (a).

As shown in FIGS. 2 (a) and 2 (b), the abutting or overlapping part of the strip-shaped metal plates is cut at an angle θ with respect to the width direction of the strip-shaped metal plates. Strength is improved.

According to the method for joining strip-shaped metal plates according to the present invention configured as described above, the strip-shaped metal plate 10 and the strip-shaped metal plate 22 are butted or overlapped with each other, and then the butted or overlapped portion is welded by the welding device 24. After being welded, the weld 40 is rolled by the rolling device 32. Therefore, the welded portion 40 has a small step, and the belt-shaped metal plates 10 and 22 welded and joined are smoothly transported while being in contact with the pass roller and sent to a coating device (not shown) in the subsequent stage, and the coating process is uniformly performed. In this case, the welded portion 40 has a large joint strength and is smoothly transported, so that there is no fear of breakage. Further, it is possible to uniformly apply the coating to the welded portion 40 without retracting the coating device from the welded portion 40 as in the conventional case.

In addition, the work strength of the welded portion 40 is recovered by rolling, so that the tensile strength is recovered and the joint strength is improved as compared with the welding. Therefore, it is particularly effective for crystals, such as aluminum, whose crystals are coarsened by melting during welding. In addition, it is possible to process the joint portion into a shape in which stress concentration is less likely to occur by rolling.

Further, the surface shape of the welded portion 40 is distorted due to heat concentration during welding and pressure fluctuation during rolling, and stress is concentrated during tension load during transportation. However, as shown in FIG. Since it is formed in A and the taper portion B, the stress of the welded portion 40 is reduced, and there is no risk of the strip-shaped metal plates 10 and 22 breaking.

Next, a comparative test was performed on the joint 40 joined by the method for joining strip-shaped metal plates according to the present invention and the conventional joint 80 shown in FIG. An aluminum plate with a width of 1030 mm and a thickness of 0.15 mm was used for the large strip metal plate, and an aluminum plate with a width of 840 mm and a thickness of 0.30 mm was used for the narrow strip metal plate.

No. 1 sample with 50 mm straight line A formed and trimmed
The sample trimmed without forming the straight line portion A is designated as No. 2.

Using these test samples No.1 and No.2, the tension is 386kg.
While being loaded, two rubber rolls (φ600), 22 rubber rolls (φ200), and two rubber rolls (φ180) were lapped, and the number of laps until cutting was examined, and a pass roller passing test was conducted. The results are shown in Table 1.

As is clear from Table 1, a sample having a straight line portion A
It can be seen that the pass roll passability of No. 1 is significantly improved as compared with the sample No. 2 having no straight line portion A.

Further, in the above-described embodiment, the strip-shaped metal plate is cut at an angle of θ ° with respect to the width direction, but the present invention is not limited to this.
As shown in FIGS. (A) and (b), the band-shaped metal plate may be cut in the same direction as its width direction.

Further, although the tapered portion B is formed in the above embodiment, the present invention is not limited to this, and only the straight portion A may be formed as shown in FIGS. 4 (a) and 4 (b).

〔The invention's effect〕

As described above, according to the joining method for a strip-shaped metal plate according to the present invention, a large strip-shaped metal plate and a narrow strip-shaped metal plate are butt-welded or overlapped with each other by a small amount, and the welded joint is rolled to form a large strip-shaped member. Since the straight portion having the same width as that of the narrow strip metal plate is formed at the end portion of the metal plate, it takes a long time to break the joint portion, and it is possible to prevent the joint portion from being broken during transportation.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for joining strip-shaped metal plates according to the present invention,
2 (a) and 2 (b) are plan views showing a state in which the end portion of the wide strip metal plate is trimmed into a straight portion and a taper portion having the same width as the narrow strip metal plate, FIG. 3 (a), FIG. 4B is a plan view showing another embodiment of the method for joining strip-shaped metal plates according to the present invention, and FIGS. 4A and 4B show another example of the method for joining strip-shaped metal plates according to the present invention. 5A and 5B are perspective views showing a joint portion according to another conventional joining method of strip-shaped metal plates, and FIG. 6 is a perspective view showing a joining method of the conventional strip-shaped metal plates. FIG. 7A and FIG. 7B are plan views of the edge-trimmed joint portions, and FIGS. 7A and 7B are plan views of the edge-trimmed joint portions of the strip-shaped metal plates having different widths. . 10, 22 …… Band-shaped metal plate, 16 …… Joining device, 18 …… Precutting device, 24 …… Welding device, 32 …… Rolling device, 42 …… Edge trimming device, 40 …… Welding part, A …… Straight line Division, B
...... Tapered part.

Claims (2)

[Claims] 1. A large strip metal plate and a narrow strip metal plate are abutted and welded to each other, a welded joint is rolled, and an end portion of the joined large strip metal plate is formed with a straight portion having the same width as the narrow strip metal plate. A method of joining strip-shaped metal plates, which comprises performing a trimming process as described above. 2. The method for joining strip-shaped metal plates according to claim 1, wherein trimming is performed so that a taper portion is formed from the end of the straight portion of the substantially strip-shaped metal plate to the side edge.