JPS61276792A - Butt welding method for metallic strip - Google Patents

Abstract

PURPOSE:To make a cutting line and a weld line coincide with each other by crossing a preceding plate and a following plate in a carrying direction, running a rotary wheel cutting body and cutting them separately, and on the other hand, running a welding torch along a running locus of this cutting body. CONSTITUTION:The rear end part 1' of a preceding plate 1 is fixed by a preceding clamp 13, a following clamp 14 and a moving clamp 33, and the rear end part 1' is cut by running the rotary wheel cutting body 19 in the plate width direction. By the moving clamp 33, the preceding plate 1 is advanced by a prescribed distance (l) to a downstream side, and a scrap 1a is swept down by advancing a following plate 2. Next, a tip part 2' is fixed by the preceding clamp 13 and the following clamp 14, and thereafter, it is cut by the cutting body 19. Thereafter, the following plate 2 is advanced, and the scrap of the following plate is swept down. Next, the preceding plate 2 is moved backward to its original position by the moving clamp 33, and the cutting plane of the preceding plate 2 is made to coincide with the running locus of the cutting body 19 and fixed by the clamp 13. Thereafter, the cutting plane of the following plate 2 is butted to the cutting plane of the preceding plate 2, fixed by the following clamp 14, and welding is executed by running a welding torch along the running locus of the cutting body 19.

Description

DETAILED DESCRIPTION OF THE INVENTION <Object of the Invention> Industrial Field of Application The present invention relates to a method for butt welding metal strips, and more particularly, to a method for butt welding metal strips (hereinafter referred to as a leading plate).

) and the opposing ends of the trailing metal strip (hereinafter referred to as trailing plate) are individually cut by abrasive cutting using a common rotary abrasive cutting body such as a disc-shaped grindstone, and then both of these cuts are performed. When welding the end surfaces together by moving a laser welding torch in the width direction of the plate, for example, the cut surfaces can be butted together with almost no gaps, and the butt line and weld line can be perfectly aligned. This relates to a butt method that can be welded.

BACKGROUND OF THE INVENTION In general, the ends of metal strips (hereinafter simply referred to as strips) are joined together and a predetermined process is continuously performed. The tips are sheared individually or simultaneously using a single cut shear or double cut shear, and these cut surfaces are brought together to form a bevel, and then usually TIG or M
They are joined by welding using IG or the like. However, the plate thickness is 0.5~0.15m*+, the plate width is 500~1
It is difficult to use normal TIG welding or IAIG welding to weld extremely thin and wide strips such as 500 mm, so laser welding is often used instead.
It has become. The reason for this is that laser welding creates almost no heat-affected zone in the weld, and the width of the welding peak can be made small, so there is no problem in welding thin and wide strips. .

However, with laser welding, it is difficult to weld a groove with the precision of TIG welding or MIG welding, and furthermore, the precision is extremely strict.

1 In other words, laser welding has the advantage that the diameter of the hot wire can be made extremely thin, and in order to take full advantage of this, it is necessary to have a welding opening where the travel line of the welding torch and the butt line between the leading and trailing plates strictly coincide. is necessary. For example, when welding ultra-thin and wide silicon steel plates, it is necessary to minimize the weld bead width without generating a heat-affected zone.
To meet this requirement, laser welding is used with a laser beam diameter of 0.
This can be satisfied because it can be made as small as 1 to 0.2 ml11φ. Furthermore, the laser beam itself has excellent straightness, and even if the laser beam has a diameter of 0.1 to 0.2 mm+, if the groove precision is high, it is possible to weld strips with a very small welding width. , especially for plate thickness 0
．． Even extremely thin strips such as 5 to 0.151611 can be welded without any problem by minimizing the welding area. However, this ultra-thin laser beam diameter requires very strict conditions, such as an extremely small tolerance for the butt gap between the leading and trailing plates and perfect straightness of the bevel line. Conforming groove formation is a prerequisite for laser welding applications.

However, in the conventional single cut shear and double cut shear, the cutting mainly depends on shearing,
When butting together after cutting, it is not possible to obtain a groove that meets the above conditions, especially for thin plates with a thickness of 0.15 to 0.20111 m and a wide width. It's almost impossible to get caught.

In other words, since cutting with a single-cut shear or a double-cut shear mainly involves shearing, it is impossible for the shear to cut with straightness in the thickness direction, which inevitably results in brittle fractures or curved parts. When the sheet is cut, the cutting line is bent and curved in the width direction of the sheet, and strict bevel precision cannot be maintained even when the sheets are butted together.

In addition, in the cutting method using a single cut shear,
In advance, the opposing ends of both the leading and trailing plates are cut individually with one single cut shear at the cutting position, and then moved to the welding position, where the cut surfaces are butted against each other, and this butt line is welded. Welded in line with the line.

With this method, both strips are cut with the same shear, which has the advantage of obtaining an inward-tending cut surface, but during welding, the strip is moved from the cutting position to the welding position, where it aligns with the weld line. Let them match. Therefore, it is necessary to develop a corresponding technique and matching device, and problems in this respect remain.

On the other hand, in the method of cutting with a double cut shear, the leading plate and the trailing plate are cut at the same time, and welding is performed with almost no movement from the cutting position. For this reason, there are fewer problems when using a single-cut shear, etc., but each end of the leading and trailing drawing boards is cut with a separate shear, and as a result, the shapes of both cut surfaces are different, and the butting accuracy is poor. The so-called groove congruence is lost.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks, and specifically, as described above, compared to cutting with the double cutter 11-,
In the case of a single cut shear, there are problems such as cutting the opposing ends of the leading plate and trailing plate individually and moving them to the welding position after cutting, but since they are cut by the same cutting means, If a cut surface of the same shape can be obtained and the cutting line and weld line can be matched accurately, a highly accurate bevel can be obtained, and both cut surfaces can be effectively utilized to have excellent straightness. In particular, we propose a method in which the leading plate and trailing plate are individually cut by abrasive cutting with a disc-shaped grindstone, and the welding is performed by running a welding torch to match the cutting line. .

<Structure of the Invention> Means for solving the problem and its operation, that is, the method of the present invention involves running a rotary abrasive cutting body intersecting the conveying direction of the metal strip to cut the rear end of the preceding metal strip. After cutting the leading metal strip using abrasive grain cutting, the leading metal strip is advanced downstream, while the trailing metal strip is also advanced downstream to remove the scrap generated by the cutting, and then the trailing metal strip is advanced downstream. After cutting the metal strip backward by abrasive cutting with the rotating abrasive cutting body, further advancing the trailing metal strip downstream,
Remove the scrap generated by this trailing cut, and then
The leading metal strip is retreated upstream to align the cutting surface of the trailing end with the travel locus of the rotary abrasive grinding body, and then the trailing metal strip is cut on the cutting surface of the trailing end. It is characterized in that the surfaces are butted together, and then welding is carried out by running welding holes along the traveling locus of the rotary abrasive cutting body.

Therefore, the structure of this means and its operation will be specifically explained with reference to FIGS. 1(a) to (dl) as follows.

First, Figure 1 (a), (b), (c), (d), (e)
1(f) is an explanatory view of an example of each step when carrying out the method of the present invention. First, as shown in FIG. , fix it with the ramp 14 and moving clamp 33 that will be done later (in addition, 1
1a is the lower table on the preceding side, 11bLt is the lower table on the 1st row side). Thereafter, in this state, the rear end portion 1' of the preceding plate 1 is cut by moving the rotary abrasive cutting body 19 in the width direction of the plate. After opening the leading ramp 13 and trailing ramp 14, the leading plate is moved downstream by a certain distance (1) using the moving clamp 33, while the trailing plate 2 is moved downstream. Scrap 1a generated during cutting by
Press to shake it off (see Figure 1(b)).

Next, the leading end 2' of the trailing plate 2 is fixed with the leading ramp 13 and the trailing ramp 14, and is cut with a rotary abrasive cutting body 19 (see FIG. 1(C)).

After that, the trailing plate 2 is moved forward, and the scrap 2a of the trailing plate is
(See Figure 1(d)).

Next, as shown in FIG. 1(e), the leading plate 2 is moved back upstream to its original position by the movable clamp 33, and the cut surface of the leading plate 2 is made to match the travel locus of the rotary abrasive cutting body 190. In this state, fix it with the leading plate clamp 13 (Fig. 1 (
(see e)).

Thereafter, the cut surface of the going board 2 is butted against the cut surface of the leading board 1 and fixed with the trailing board clamp 14.

Subsequently, for example, a welding I/-chi 21 such as a laser is caused to travel along the traveling trajectory of the rotary abrasive cutting body 19, that is, it travels at the same position as the cutting surface of the rotary abrasive grain cutting body 19 on the preceding plate side. Welding is performed with a welding torch 21 (Fig. 1(f) @Shi).

As mentioned above, when carrying out the method of the present invention, for example, as shown in FIG. The traveling rails 15 are arranged to intersect with the transport direction, and the traveling rails 1
at least two traveling trolleys 1G that can freely travel along 5;
20, and among these running carriages, one of the running carriages 1G is provided with a rotary abrasive cutting body 19 at will,
A welding torch 21 such as a laser welding torch is disposed on one side of the other traveling carriage 20. Therefore, one traveling bogie 1G
When the is run along the traveling rail 15, the rear end 1' of the leading plate 1 and the leading end 2' of the trailing plate 2 can be cut by abrasive cutting by the rotary abrasive cutting body 19, and then both cut surfaces are cut. and then move the other traveling trolley 20 onto the traveling rail 15.
When the welding torch 21 travels along the welding torch 21, welding can be performed.

Further, the rotary abrasive cutting body may be any object that can cut with abrasive grains, such as a disc-shaped grindstone, and in particular,
The rotating abrasive cutting body is driven by a drive motor attached to a traveling carriage.

Therefore, both the cutting surfaces of the leading board and the trailing board are cut by the same rotating abrasive cutting body, so their shapes are the same, and since they are cut by abrasive grains, the entire surface is Straightness can be maintained, and even if the butt groove is formed using the cut surface of the preceding plate as a reference, a highly accurate butt groove can be obtained.

Example Next, examples will be described.

First, a thin steel plate (thickness of 0.15 to 1.00 mm, 110
Figure 1 (a), (b), (c), (d), (e) and ('
), and then butted together and laser welded by running a welding torch (hot wire diameter 0.1 to 0.3 m).
mφ). At this time, the cutting means used is a disc cutter (a disc-shaped grindstone, 1 to 3 mm thick and 100 to 15 mm in diameter).
0φ), 3000 to 110000r with this cutter.
p.

Cutting was performed at a cutting speed of 1 to 4 m/min. In addition, laser welding 1-chi was run at a speed of 1 to 6 m/min, and the diameter of the dome was changed to <0.1 to 0.3 mmφ as described above.
Good weld beads were obtained in all cases.

<Effects of the Invention> As explained in detail above, the method of the present invention involves cutting the rear end of the leading plate and the leading end of the trailing plate individually, and when these cut surfaces are brought together and welded, A rotary abrasive cutting body such as a disc cutter is run intersecting the conveyance direction of the leading plate and the trailing plate to individually cut the leading plate and the trailing plate by abrasive cutting. The welding torch is run along the trajectory of the grain cutting body.

Therefore, the cutting line and the welding line always match, and the accuracy of butting can be improved simply by butting the cut surfaces together.

In addition, since cutting is performed using a rotating abrasive cutting body such as a disc cutter, the cut surface is flat and has an extremely good surface roughness. It can be used as a reference surface, and the butting accuracy is improved from this surface as well.

Further, since the leading plate and the trailing plate are cut with the same rotating abrasive cutting body, the shapes of both cut surfaces are consistent, and the groove precision is improved from this aspect as well.

[Brief explanation of drawings]

Figures 1 (a), (b), (c), (dl, (e), and ([)) are explanatory diagrams of examples of each process when carrying out the method of the present invention, and Figure 2 is an illustration of the method of the present invention. It is a cross-sectional view from the width direction of a metal strip plate of an example of a device for carrying out the following.Symbol 1... Leading plate 1'... Rear end portion 2... Trailing plate 2′・・・・・・
・The tip 1a... Scrap 2a...
...Scrap 13... Lamp to be done first 1
4... Ramp to be done later 15... Running rail

Claims (1)

[Claims] A rotary abrasive cutting body is run to intersect with the conveyance direction of the metal strip, and the rear end of the preceding metal strip is cut in advance by abrasive cutting, and then this preceding metal strip is advanced downstream, while The trailing metal strip is also advanced downstream to remove scrap generated in the cutting, and then the trailing metal strip is cut by abrasive cutting with the rotary abrasive cutting body, and then further The trailing metal strip is advanced downstream to remove scrap generated by this trailing cutting, and then the leading metal strip is retreated upstream and the cut surface of the trailing end is subjected to the rotary abrasive grinding. Match the running trajectory of the body, then match the cut surface of the trailing metal strip with the cut surface of this rear end, and then,
A method for butt welding metal strips, characterized in that welding is performed by running a welding torch along the travel locus of the rotary abrasive cutting body.