JPS602155B2 - steel strip welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel strip welding device equipped with an oxide removing device suitable for welding steel strips whose surfaces are covered with oxidation products (hereinafter referred to as oxides). It is.

Conventionally, as a method for removing this type of oxide, there was no special equipment and the surface of the welded part of the steel strip was polished by an operator using a hand glider or the like for welding.

For this reason, this welding not only requires a large amount of labor, but also increases the welding cycle and causes unevenness in oxide removal, which adversely affects the quality of welding and has the disadvantage of low productivity. .

In addition, as for the influence of this oxide on weldability, as shown in FIG.
and the preceding steel strip 2 whose surface is covered with oxides 51 and 52, and the top. Even if a current is passed through the lower electrodes 3 and 4 after welding, the insulating properties of the oxides 49 and 50 (especially the ferrite type of SUS are high) will prevent the current from flowing and welding will become impossible.
Alternatively, even if the insulation is low, it becomes difficult for current to flow, the nugget 53 becomes small, and the desired welding strength cannot be obtained. This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and by removing the insulating oxide covering the surface of the steel strip to be welded using a knurling tool and a grindstone, lap welding can be easily performed. To provide a steel strip welding device that enables the welding of steel strips. below,
An embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, the upper and lower electrodes 3 and 4 for welding the overlapping portions of the trailing and leading steel strips 1 and 2 are mounted on a carriage 5, and wheels 6 and 7 are provided on the carriage 5 to form a common base 8. Welding is performed by moving the carriage 5 to the right in the figure. In this case, upper and lower oxide removal devices 9 remove oxides generated on the surfaces of the ends of the steel strips 1 and 2.
, 10, and then welding is performed. Figures 3 to 6
The figure shows the configuration of oxide removal devices 9 and 10.

In the figure, a grindstone 11 and an upper grinder 12 are held on a grinder support fitting 13 by a grinder holding fitting 14, and connected to a shaft 15 so as to be movable up and down, and guided by a bearing 16. The bell 17 mounted above has the role of keeping the grinding pressure constant, and its weight can be adjusted. This grinding pressure becomes the contact force of the grindstone 11 when grinding the trailing and leading steel strips 1 and 2, which will be described later. This pressure is generated by the weight of the above-mentioned equipment, and since the weight is too much, an equal load spring 18 is attached to the carriage 5 to reduce the pressure so as to obtain the optimum pressure. The shaft 15 connected to the grinder 12 can be moved up and down by moving the main body bracket 19 using the cylinder 20.

Here, since it is necessary to prevent the grindstone 11 from protruding from the lower surface of the upper guide 21 in the lifting machine of the main body bracket 19, the stroke adjustment fitting 22 rotatably attached to the mounting base 16 is attached to the rising end of the main body bracket 19. , the shaft 15 is raised by contacting the abutment screw 23 at one end thereof. The stopper 24 is provided to prevent the lower oxide removing device 10, which will be described later, from coming into contact with the main body bracket 19 at its lowering point. Cylinder support pin 25
supports the cylinder 20. The joint 26 supplies compressed air to the grinder 12. nut 27
is used to lock the butt screw 23. Guide 28-30
is for guiding the main body placket 19. The rotation stopper 31 is for ensuring that the grindstone 11 connected to the shaft 15 is parallel to the traveling direction. Guide piece 32,3
3 has the role of guiding the detents 31 by sandwiching them from the left and right sides respectively. A knurl 34 is rotatably attached to the upper guide 21. Similarly, referring to FIG. 6, the lower oxide removal device (10 in FIG. 4) will be explained.

A whetstone 35 and a lower grinder 36 are attached to a cylinder fitting 37 and connected to a shaft 38.

Further, a cylinder 39 is attached to the cylinder mounting bracket 37, allowing the grinder 36 to move up and down. Grinding pressure is obtained by adjusting the pressure flowing into this cylinder 39 with a pressure reducing valve 40. Shaft 38 is guided by bearings 42, 43 mounted on support bracket 41. The adjustment bolt 44 is used to adjust the upper limit position of the grinder 36. The bellows 45 has a grinding calendar, etc. bearing 4
This is to prevent intrusion into areas 2 and 43. A knurl 47 is rotatably attached to the lower guide 46. 48 is a rotation stopper.

In FIG. 7A, the welded overlapping portions 2a and 2b shown on the upper and lower surfaces of the preceding steel strip 2 are knurled and ground, and the operation thereof will be described in detail.

The upper oxide removal device 9 in FIG. 2 is similar to that shown in FIGS.
As shown in the figure, the main body bracket 19 is attached to the cylinder 20
is pressurized downward.

First, the grindstone 11 and the knurl 34 are pressed onto the upper surface of the preceding steel strip 2. The lower oxide removal device 10, shown in FIG. 6, presses the cylinder 39 upward to press the grindstone 35 against the lower surface of the preceding steel strip 2. Here, by pressurizing the upper part, the preceding steel strip 2 is sandwiched between the lower knurl 47 and the upper knurl 34 by the pressing force of the upper cylinder 20. In this state, when the grindstones 11 and 35 are rotated and the carriage 5 is moved to the right as shown in FIG. 2, the knurls 34 and 47 are dented in the surface of the preceding steel strip 2 as shown in FIG. A portion 2c and a raised portion 2d are formed, and the raised portion 2a is cracked and becomes a surface from which oxides are easily removed by grinding. Also, recessed part 2
c is the surface from which the oxide has been removed. Next, the knurled surface is ground with a grindstone, but the surface of the raised portion 2d is mainly processed, and the oxide is removed. At this point, oxides from knurling and grinding the weld will be removed. Next, in FIG. 2, the carriage 5
After the processing of the upper and lower surfaces of the preceding steel strip 2 is completed, the grinding wheels 11 and 35 of the upper and lower oxide removal devices 9 and 10 are turned on.
47 rises and falls and runs to the left. At the same time as the traveling, the rear steel pipe 1 is overlapped as shown in FIG. 7B. Then, the lower surface of the leading steel strip 2 and the upper surface of the trailing steel strip 1 are knurled and ground again. At the same time, the 6th
In the figure, the upper electrode 3 and the lower electrode 4 also weld the overlapping portion of the steel strips 1 and 2, as shown in FIG. 7c.
In the case of this figure, a spot welding device is shown, and when welding current is applied, the carriage 5 stops traveling. Figure 1 shows oxide 4
This shows the welding state when numbers 9 to 52 are not removed.

In FIG. 1, if the oxide is not removed, electrode 3,
Even if 4 is pressurized and electricity starts flowing, the current may not flow in the case of ferritic stainless steel because of its high insulation properties. Also, even if the current flows, it will be weak and the nugget 53
nugget 5 is not formed sufficiently, or the nugget 5 is located in a completely different position.
3 may be formed, and the welding strength cannot be guaranteed. Furthermore, the contact resistance between the oxides 50, 52 and the electrodes 3, 4 may locally become extremely high, which may damage the electrodes. In contrast, in the case of the present invention, as shown in FIG. In welding in which the lower surface is ground and knurled to remove the oxides 49, 51, and 52, stable welding strength can be obtained and the life of the electrode can be maintained for a long time. Therefore, not only has it become easier to weld ferritic stainless steel that has oxides, but it has also made it possible to extend the life of the electrode by removing austenitic oxides (which have almost no insulating properties). Also possible.

Furthermore, conventionally, this type of oxide has been removed by inputted grinding work before the line is passed through the line, but it is highly effective to have a removal device built into the welding machine so that it can be processed mechanically. Further, it can be used by being incorporated into a seam welding device.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the energization state by the secondary steel strip welding device, Fig. 2 is a configuration diagram showing an embodiment of the present invention, and Fig. 3 shows the main part of the embodiment of the present invention. Front view, Figure 4 is the 3rd
5 is a sectional view taken along line W-W in FIG. 3, FIG. 6 is a front view showing essential parts of an embodiment of the present invention,
FIG. 7 is an explanatory diagram of the processing order of steel strips, where A shows the knurled state of the preceding steel strip, B shows the state where the preceding and following steel strips are overlapped, and C shows the welded state. FIG. 8 is a side view showing the state of knurling, and FIG. 9 is an explanatory diagram showing the state of welding according to an embodiment of the present invention. In the figure, 1 and 2 are steel strips, 34 and 37 are knurls, 11,
35 is a whetstone. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. In a method in which the ends of a pair of steel strips are stacked one above the other and welded by passing an electric current between the two steel strips, a knurling tool is used on both sides of one end of the steel strip before the two steel strips are stacked. After the above-mentioned two steel strips are overlapped, the ends of the opposite sides of the contact surfaces of the above-mentioned steel strips are processed using the above-mentioned knurling tool, and then the above-mentioned steel strips are knurled with the above-mentioned grindstone. Welding equipment for steel strips configured for grinding.