JPS60124481A - Method and device for forming weld zone - Google Patents

Abstract

PURPOSE:To form easily the meshed part of the welded end part by forming the part near the end part of a metallic strip to be welded to a crest shape over the entire width thereof by a revolving roller for plastic deformation then cutting the end part by a revolving roller for shearing. CONSTITUTION:A frame 11 is moved parallel in a welding direction to bring a revolving roller 12 for plastic deformation and a receiving roller 14 into storage press contact with a metallic strip 1, by which the crest shape of the roller 12 is formed to the end of said strip. The unnecessary part 1a is thereafter sheared and removed by a succeeding revolving roller 13 for shearing and an auxiliary revolving roller 15 for shearing. On the other hand, the roller 12 and the roller 13 come to the underside of the frame 11 and the roller 14 and the roller 15 come to the top side of the frame 11 to form a crest shape 10 on the bottom surface of the strip 2 in the case of providing the crest shape to a metallic strip 2. The crest shape 9 formed at the rear end of the preceding strip 1 and the crest shape 10 formed at the front end of the succeeding strip 2 are meshed with each other and both parts are welded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a welded portion of a material when welding the material using a narrow lap seam welding device, and to the device.

Among the welding machines for connecting metal strips used in continuous processing lines for metal strips, welding machines used in cold rolling equipment in particular:
Since a large mechanical force is applied to the weld during processing, consideration must be given to increasing the strength of the weld so that the weld can sufficiently withstand the force.

Currently, narrow lap seam welding equipment is said to be the most suitable welding machine. However, even this welding device is not completely secure against breakage. As a countermeasure against this problem, it has been considered to shape and weld the ends of the metal strips to be pre-welded so that they mesh with each other before welding. The object of the present invention is to provide a method and apparatus that can easily form the meshing part of the welded part.

A conventional method of welding metal strip joints using narrow lug seam welding will be described.

In FIG. 1, 1 is a leading metal band, and 2 is a trailing metal band. As shown in FIG. 2, the vicinity of the rear end of the leading metal band 1 is clamped by clamping devices 3a, 3b, and the vicinity of the leading end of the trailing metal band 2 is clamped by clamping devices 4a, -4b. Then the third
As shown in the figure, the rear end of the preceding metal band 1 is sheared by shearing devices 5a and 5b.
The leading edge of the trailing metal band 2 is cut by a shearing device 6a.
, trim with 6b. Next, as shown in FIG. 4, by moving the clamping devices 3a, 3b and/or both of the clamping devices 4a, 4b, the metal strips 1 and 2 are provided with wraps corresponding to their thicknesses. Overlap the ends of the metal strips. Next, as shown in FIG.
b is rolled under strong pressure in the board width direction (perpendicular to the plane of the paper), and the pressure rollers 7a, 7b continue to move, and the electrode rollers 8a, 8b are rolled in the board width direction as shown in FIG. Weld with electricity while The cross section after welding is as shown in FIG.

A problem with this welding method is that the connection surface becomes inclined during pressure processing. For this reason, if strong pressure is applied, a component of the pressure force acts on the metal band in the front-rear direction, and although the metal band may be buckled or clamped, if the force increases, it will slip and move in the X direction. There is. As the pressure rollers 7a and 7b roll in the width direction of the plate, the welded portion gradually separates, resulting in poor welding. This tendency shows that as the plate thickness T increases, the pressurizing force increases at a greater rate than the strength against buckling, and welding defects tend to increase.

In view of the above, a method has been considered in which, as shown in FIG. 8, the ends of the metal strips are formed in advance into chevrons 9 and 10 so as to interlock with each other before welding. With this method, the pressurizing force is extremely small compared to conventional methods, and because the chevrons engage with each other, the front and rear component forces are almost completely eliminated, and there is no escape of the metal strip from the front and rear, making it possible to perform highly reliable welding. That's why.

That is, the welding part forming method according to the present invention involves forming a chevron over the entire width near the end of the metal strip to be welded using a rotating roller for plastic deformation in narrow lap seam welding, and then
The ends are sheared using a rotating shearing roller.

In addition, the welding part forming device according to the present invention is provided with a frame that moves in the same direction as the welding direction in the narrow lap seam welding device, and a rotary roller for plastic deformation that forms a chevron on this frame, and a rotating roller for plastic deformation that forms a chevron. A rotating roller for shearing is installed on the holder.

The present invention will be described in detail based on FIGS. 9 to 11, and the same or substantially the same parts as in FIGS. 1 to 7 are given the same reference numerals. Fig. 9 is a front view, Fig. 10 is a sectional view taken along line A-A in Fig. 9, and Fig. 11 is a sectional view taken along line B-B in Fig. 9, which shows the action during shearing, and shows the support of the rotating shearing roller. The structure is the same as the rotating roller for plastic deformation shown in FIG.

11 is a horizontal U-shaped frame. On one side of this U-shaped frame 11, a rotating roller 12 for plastic deformation and a rotating roller 13 for shearing are attached to a shaft 17a, a bearing 18a, a chock 19. It is attached rotatably and vertically adjustable by a vertical position adjustment bolt 20. In addition, on the other side of the same frame 11, there are rollers 14 for plastic deformation corresponding to the rotary rollers 12 and auxiliary shearing rollers 15 corresponding to the rotary shearing rollers 13 for shafts 17b and bearings 1.
8b, it is rotatably attached.

The U-shaped frame 11 as described above is arranged such that each roller is positioned parallel to the end of the metal strip 1, and an arbitrary driving means (not shown) is provided parallel to the end of the metal strip 1, that is, in the width direction. and a guide means (not shown). As this driving means, a rod 16 shown in FIG.
may be pulled in the direction of the arrow using a hydraulic cylinder (not shown).

The frame 11 is moved in parallel to the welding direction, and the rotation roller 12 for plastic deformation and the receiving roller 14 are strongly pressed against each other, so that the chevron shape of the roller 12 is formed at the end of the metal strip 1.

Adjust the depth during forming so that the top of the chevron does not press through the entire board thickness.

Thereafter, the unnecessary portion 1a is sheared off using the subsequent rotating shearing roller 13 and the auxiliary shearing roller 15. In addition, at this time, the metal band 1 is clamped by a clamping device 3a, as shown in FIG.
Of course, it should be clamped with 3b.

On the other hand, when forming a chevron on the metal strip 2, the plastic deformation rotating roller 12 and the shearing rotating roller 13 are attached to the frame 1.
At the same time, the receiving roller 14 and the shearing auxiliary roller 15 come to the upper side of the frame 11, forming a chevron 10 on the lower surface of the metal band 2. At this time, the metal band 2 is clamped by clamp devices 4a' and 4b as shown in FIG.

Next, as shown in FIG. 4, by moving the clamp devices 3a, 3b and/or both of the clamp devices 4a, 4b, as shown in FIG. A chevron 10 formed at the tip of the row metal band 2
are interlocked with each other.

As shown in FIG. 5 and FIG.
Electric welding is performed in step b.

By processing and operating as described above, it has become possible to easily form the meshing part of the metal strip end, that is, the welding part, which is preferable for welding as described above.

In addition, this forming process can be performed at the same time as shearing the metal strip, so there is no time loss compared to conventional methods, and the thickness of the plate at the shearing part is significantly reduced, making it easier for the shearing rollers and auxiliary rollers to escape. Since there is less friction and accurate shearing is possible, the reliability of welding is further improved.

[Brief explanation of drawings]

FIGS. 1 to 7 are side views illustrating a conventional joint welding method and showing the steps in the order of steps. Fig. 8 is a side view when a chevron is provided at the end of the metal band, Fig. 9 is a front view of the device of the present invention, Fig. 10 is a side view when the chevron is formed, and Fig. 11 is a side view when sheared. It is. 1 Metal band (preceding) 1a Unnecessary part 2 Metal band (following) 3a, 3b Clamp device 4a, 4b Clamp device 5a, 5b Shear device 6a, 6b Shear device 7a, 7b Pressure roller 8a, 8b Electrode roller 9 Chevron 10 Yamagata 11 Frame 12 Rotating roller for plastic deformation 13 Rotating roller for shearing 14 Support roller 15 Auxiliary roller for shearing 16 Rods 17a, 17b shafts 18a, 18b Bearings 19 Chocks 20 Vertical position adjustment bolt L Wrap allowance T Plate thickness patent application Representative of Nissin Steel Co., Ltd. Patent attorney Furu 1) Takeshi Tsuyoshi Figure 10 Figure 5 Figure 6 B

Claims (1)

[Claims] 1. In narrow lap seam welding, a chevron is formed over the entire width near the end of the metal strip to be welded using a rotating roller for plastic deformation, and then the end is sheared using a rotating roller for shearing. A welded part forming method characterized by: 2. The narrow welding device is provided with a frame that moves in the same direction as the welding direction, and this frame is provided with a rotating roller for plastic deformation that forms a chevron shape, and a rotating roller for shearing is subsequently provided on the frame. Welding part forming equipment.