JPH0243585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a welded joint when metal strips are welded and connected using a narrow 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 particular for cold rolling equipment have a large mechanical force acting on the manual welding part of the processing relay, so the welding part Care must be taken to increase the strength of the welded part so that it can withstand the force sufficiently.

Currently, narrow tup seam welding equipment is said to be the best welding machine. However, even with this welding device, it is not completely secure against breakage. As a countermeasure to this problem, it has been considered to form and weld the metal strips to be welded together so that the weld joint surfaces at the ends of the metal strips 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 engagement part of the welded joint.

A method of welding metal strips together using conventional narrow tup seam welding will be described.

In FIG. 1, numeral 1 indicates a leading metal strip having a thickness Tc, and numeral 2 indicates a following metal strip having a thickness Td. As shown in FIG. 2, both metal bands 1 and 2 are fixed by sandwiching the vicinity of the rear end of the leading metal band 1 with clamp devices 3a and 3b, and the vicinity of the tip of the trailing metal band 2 with clamp devices 4a and 4b. Next, as shown in FIG. 3, the rear end of the leading metal band 1 is trimmed by shearing devices 5a, 5b, and the tip of the trailing metal band 2 is cut by shearing devices 6a, 6.
Trim with b. Next, as shown in FIG. 4, the clamp devices 3a, 3b and the clamp devices 4a, 4
By moving both or one of the metal strips 1 and 2, the ends of the metal strips 1 and 2 are overlapped with each other with a lap distance L corresponding to the thicknesses Tc and Td of the metal strips 1 and 2. Next, as shown in FIG.
b is rolled under strong pressure in the board width direction (direction perpendicular to the plane of the paper), the overlapping portions are pressed together, and the welded joint surfaces are leveled and brought into close contact.

Continuing with this movement of the pressure contact rollers 7a, 7b, as shown in FIG. 6, electrode rollers 8a, 8b are pressed in the width direction of the plate and rolled while conducting electrical welding. The cross section after welding is as shown in FIG.

A problem with this welding method is that the connection surface (welding joint surface) is inclined during pressure welding of the overlapping portions. For this reason, if the metal strips 1 and 2 are machined strongly, a component of the pressing force will act in the front and back direction of the metal strips 1 and 2.
Although it is said that the metal bands 1 and 2 are clamped, if this component force becomes large, the metal bands 1 and 2 tend to buckle and slide in the X direction. and pressure roller 7
As a, 7b rolls in the plate width direction, the lapping margin L tends to gradually become smaller. Therefore, the welded joint surface of the overlapping portion of the lap distance L becomes narrower, and the welding conditions change, resulting in poor welding. This tendency shows that as the plate thicknesses Tc and Td increase, the rate at which the pressurizing force increases is greater than the strength of the plate against buckling, so welding defects tend to increase.

From the above, as shown in FIG.
Before welding the joint for connecting the metal strips 1 and 2, a method has been considered in which the ends of the metal strips 1 and 2 are formed in advance as follows and welded. That is, the cross-sections of the surfaces 9 to be welded and joined are inclined to each other, and the sloped surfaces 9 are provided with peaks 10a and troughs 10b. The sloped surface 9 is shaped so that the two end portions mesh and engage with each other due to the step R between the peak portion 10a and the valley portion 10b. With this method, the overlapping thickness of the overlapping engaging parts is thinner than before, so the pressure applied to the overlapping engaging parts can be extremely small compared to the conventional method. By meshing the ends, most of the component forces in the front and rear directions are eliminated, and buckling of the plate is reduced or reduced, so there is no escape of the metal strip in the front and rear, and highly reliable welding is possible.

That is, the method of forming a joint weld according to the present invention involves meshing and engaging the two ends of the two metal bands 1 and 2 to be welded with each other over the entire width near the ends using the rotating rollers 12 for plastic deformation. Mountain part 10a and valley part 1
After forming the inclined welded joint surface 9 having a step R between the inclined welded joint surface 9 and the inclined welded joint surface 9 with the shearing rotating roller 13.
The unnecessary parts 1a and 2a on the tip side from the peaks 10a and troughs 10b are sheared and removed.

Furthermore, the joint weld forming device according to the present invention includes:
A narrow tap seam welding device is provided with a frame 11 that reciprocates along the direction in which the joint is welded, and the frame 11 is provided with both metal strips 1 and 2 to be welded.
A rotating roller 12 for plastic deformation is provided to form an inclined welding joint surface 9 having a step R between a peak portion 10a and a valley portion 10b whose both ends mesh and engage with each other over the entire width near the end of the roller. At the same time, the crests 10a and troughs 10b of the inclined weld joint surface 9 are subsequently
A shearing rotary roller 13 is provided to shear and remove unnecessary portions 1a and 2a closer to the tip.

An embodiment of the present invention will be described based on FIGS. 8 to 11, in which the same or substantially the same parts as in FIGS. 1 to 7 are given the same reference numerals. 8th
The figure is a side view of the end of the metal strip, FIG. 9 is a front view of the device, FIG. 10 is a sectional view taken along line AA in FIG. 9, and FIG. The supporting structure of the rotary shearing roller is the same as that of the rotary roller for plastic deformation shown in FIG. 10.

11 is a horizontal U-shaped frame. A rotating roller 12 for plastic deformation and a rotating roller 13 for shearing are attached to one side of this U-shaped frame 11 so as to be rotatable and vertically adjustable by a shaft 17a, a bearing 18a, a chock 19, and a vertical position adjustment bolt 20. ing. Further, on the other side of the frame 11, a receiving roller 14 corresponding to the plastic deformation rotating roller 12 and a shearing auxiliary roller 15 corresponding to the shearing rotating roller 13 are rotatably attached by a shaft 17b and a bearing 18b. There is.

The U-shaped frame 11 as described above is arranged such that each roller is located parallel to the end of the metal strip 1 or 2, and any driving means ( (not shown) and guide means (not shown) for reciprocating movement. As this driving means, the rod 16 shown in FIG. 9 may be moved back and forth in the direction of the arrow using a hydraulic cylinder (not shown).

By moving the frame 11 parallel to the welding direction and strongly pressing the rotating roller 12 for plastic deformation and the receiving roller 14, the peaks 10a and troughs 10b of the rollers 12 and the step R between them are removed from the metal strip 1.
molded into the end of the The depth at the time of molding is 10a
Adjust as appropriate so that the top of the plate does not push through the entire plate thickness.

After that, the unnecessary portion 1a or 2 is removed by the following rotating shearing roller 13 and auxiliary shearing roller 15.
Accurately shear and remove a. Also, at this time, metal band 1
and 2 are clamp devices 3a, as shown in FIG.
Of course, it should be clamped with 3b.

When providing the welded joint surface 9 having such a step R on the metal band 2 with respect to the metal band 1, the plastic deformation rotating roller 12 and the shearing rotating roller 13 are located at the lower side of the frame 11, and the receiving roller 14 and the auxiliary shearing roller 15 are attached to the frame 1.
1 and forms a welding joint surface 9 that extends over the lower surface of the metal strip 2. At this time, the metal band 2 is clamped by the clamping devices 4a and 4b as shown in FIG.
Clamp it.

Next, as shown in FIG. 4, the clamping devices 3a, 3
b and/or the clamping devices 4a and 4b, the weld joint surface 9 formed at the rear end of the leading metal band 1 and the tip of the trailing metal band 2 are moved as shown in FIG. The welded joint surfaces 9 are meshed and engaged with each other.

The overlapping engaging portions thus formed are brought into pressure contact with pressure rollers 7a and 7b as shown in FIGS. 5 and 6, and are energized and pressure welded with electrode rollers 8a and 8b.

By processing and operating as described above, it has become possible to easily and accurately form the engaging portion of the ends of metal strips, that is, the joint welding portion, which is preferable for narrow tap seam 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 plate thickness at the shearing part is significantly reduced, making it possible to reduce the need for rotating shearing rollers and auxiliary rollers. There is little run-off, and even if some molding collapses at the edges, accurate shearing can be done to tidy it up.
In particular, the reliability of welding on thick metal strips 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.
FIGS. 8 to 11 are drawings for explaining the present invention, FIG. 8 is a side view when a joint welded portion that engages with the end of the metal strip is provided, and FIG. 9 is a view of the device of the present invention. Fig. 10 is a front view of Fig. 9 A-A cut side view of the welded joint surface of the joint welded part during forming, Fig. 1
FIG. 1 is a side view cut along line BB in FIG. 9 during shearing. 1... Leading metal band, 1a... Unnecessary part, 2... Trailing metal band, 2a... Unnecessary part, 3a, 3b... Clamp device,
4a, 4b... Clamp device, 5a, 5b... Shearing device, 6a, 6b... Shearing device, 7a, 7b... Pressing roller, 8a, 8b... Electrode roller, 9... Inclined welding joint surface, 10a... Peak, 10b... Valley Part, 11... Frame, 12... Rotating roller for plastic deformation, 13... Rotating roller for shearing, 14... Receiving roller, 15... Auxiliary roller for shearing, 16... Rod, 17a, 17b...
Shaft, 18a, 18b...Bearing, 19...Chock, 20...Vertical position adjustment bolt, L...Wrap allowance, Tc, Td...Plate thickness, R...Step between peak and valley,
X...Direction of escape.

Claims (1)

[Claims] 1. In a method for forming a joint weld between metal bands by narrow seam welding, a rotating roller for plastic deformation is used over the entire width near the ends of both metal bands 1 and 2 to be welded. At step 12, the step R between the peak portion 10a and the valley portion 10b where the two end portions mesh and engage with each other.
After forming the inclined welded joint surface 9 having a shape, the peak part 1 of the inclined welded joint surface 9 is
0a and unnecessary parts 1a and 2 on the tip side from the valley part 10b
A method for forming a welded joint of a metal strip, characterized by shearing and removing a. 2. In a device for forming a welded joint between metal bands by narrow tup seam welding, the narrow tup seam welding device is provided with a frame 11 that moves back and forth along the direction in which the joint is welded, and the frame 11 is welded. Should both metal bands 1, 2
A rotary roller 12 for plastic deformation forming an inclined welded joint surface 9 having a step R between a peak portion 10a and a valley portion 10b whose both ends mesh and engage with each other over the entire width near the end of the roller 12. are provided, and subsequently the peak portion 10a and the valley portion 10b of the inclined weld joint surface 9 are provided.
A forming device for a joint welded part of a metal strip, characterized in that a shearing rotary roller 13 is provided to shear and remove unnecessary parts 1a, 2a on the distal end side.