JPH0120012Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a temporary strip coil.

BACKGROUND OF THE INVENTION Generally, a rolled metal strip is wound onto an expandable mandrel (hereinafter referred to as a mandrel).
After winding is completed, the mandrel is contracted and the coiled metal strip (hereinafter referred to as a coil) is taken out and sent to the next processing step.

Since such a coil does not have any support on the inner diameter side of the coil after the mandrel has been removed, the end of the innermost turn of the strip (hereinafter referred to as the inner end) can easily become misaligned, causing damage during transportation. Due to handling and vibration, the end of the coil may shift toward the inner diameter of the coil, causing loosening of the inner diameter of the coil.

When the coil in this condition is lifted by a magnetic crane, there is a risk that it will fall out in the form of bamboo shoots, so the vicinity of the inner hole of the coil is welded.

By the way, it is necessary to shape the unevenness on the end face of the coil due to irregular winding that occurs during coil winding.
Conventionally, after shaping with a hammer using input and fitting a diameter-expanding rod into the inner hole of the coil, welding is performed at three points as shown in FIG. 3, for example, to prevent loosening due to misalignment of the inner end.

FIG. 3 shows a diameter expanding rod 11 inserted into the coil hole of the coil 10.
The end face of the coil was welded 13 at three points using a torch 12.

By the way, when looking at the side end surface of the coil 10, the fourth
As shown in the figure, the length l from the inner hole d of the coil 10
In this range, the coil side end faces are uneven, and the deviation of the end faces can be as much as 20 mm.

Negative alignment of the coil end faces is caused by the fact that when the coils are stacked and annealed with the side faces facing up and down, the protruding parts between the coils are strongly pressed, causing misalignment, and the spot welded parts peeling off. This causes loosening at the ends of the strip.

Furthermore, in the conventional method described above, skill is required for welding, and since the welding position is on the end face of the coil, the welded part is cut into a half-moon shape in the subsequent product processing process, resulting in poor width of the coil and reducing material yield. accompanied by a decline.

Generally, it is known that the outer periphery of a strip coil is bound with a hoop in order to transport the strip coil, but if such a method is applied to a coil that is subjected to an annealing process, the hoop is annealed and becomes loose, which is a problem. There is.

Generally, in order to fix the end of a metal strip, there is a method (hereinafter referred to as (referred to as citations) are known.

However, when the cited method was adopted when the coil side end faces were uneven as mentioned above, during the stacking process, the side protrusion of the innermost coil was welded directly to the strip directly below it. Because of this, it was impossible for it to shift even if it was pressed, and eventually it would become deformed, such as being crushed or falling over, making it unusable.

Furthermore, as a device for fixing a metal tape wrapping layer around the outer periphery of a metal material, for example, as disclosed in Japanese Patent Laid-Open No. 56-36323, a metal tape is wound in a laminated manner around the outer periphery of a metal material, and the terminal end of the tape is A known method is to spot-weld and fix the tape layer directly below it (hereinafter referred to as the reference example).

This method was devised for the outer periphery. Generally, the strip is wound into a coil while being tensioned, and when the mandrel is finally removed, due to the influence of the residual tension,
A behavior in which the entire coil diameter decreases occurs.

Therefore, if the cited example is to be applied to the inner circumferential side of the coil, buckling strength that can withstand this shrinking force is required. This is completely different from the case where tensile strength is required when applied to the outer periphery.

Therefore, in order to withstand this buckling when applied to the inner periphery of a coil, the tape must be wrapped multiple times to give it strength to withstand buckling, and the material cost becomes extremely high, making it difficult for industrial It is disadvantageous.

(Purpose of the invention) This invention proposes an industrially practical temporary strip coil that prevents the end of the strip in the inner hole from loosening during the annealing process of the metal strip wound into a coil. .

(Structure and operation of the invention) The gist of this invention is a temporary strip coil in which the end of the strip in the metal strip coil hole is temporarily welded with a metal ribbon.

This invention will be explained in detail below based on the drawings.

Figure 1 is an overall perspective view of this invention, Figure 2 is the first
It is an explanatory diagram of the main part of the figure.

In the figure, the strip end 16 of the coil hole of the coil 10 is temporarily welded 1 with a metal ribbon 15.
3 has been done.

In the process of developing this invention, the ribbon often buckled at first. When the cause of this was investigated, it was found that the buckling strength of the ribbon could not withstand the shrinking force of the coil, and the countermeasures were: increasing the cross-sectional area or number of ribbons, and: spacing L of ribbon welding points. (Fig. 2) was found to be effective.

Furthermore, in the process of pushing in the protrusion on the coil side end face, the protrusion was crushed or deformed, and the spot welds on the ribbon were peeled off, etc., before the deviation of the inner winding of the coil was corrected.

When we investigated the cause of this, we found that a torsional deformation force acts on the ribbon 15 during the process of pushing in the protrusion, and when the force required to deform the ribbon exceeds the force required to push it in, crushing and deformation occur. We have found that as countermeasures to this problem, two methods are effective: reducing the cross-sectional area of the ribbon and increasing the welding point spacing L of the ribbon.

As a result of various studies combining the above-mentioned factors, it was found that the metal ribbon has deformability and strength against the force that presses the protruding portions between the coils, for example, when the coils 10 are stacked. By the way,
It may be a metal strip or a round or square wire. According to experience, use a ribbon with a thickness of 0.6 to 2.0 mm, a width of 40 mm or less, and a slenderness ratio (width/length) of 1/3 to 1/20. If the strength is insufficient, use multiple ribbons as shown. Good.

Welding 13 is performed by attaching a metal ribbon 15 to the strip end 16 and the coil portion 17, and to one turn of the inner coil. Although the welding method is not particularly limited, spot welding is preferred. L between spot welds is 40mm~
160mm is appropriate.

(Effects of the invention) Since this invention uses a metal ribbon, by keeping the thickness of the ribbon constant, welding conditions can be specified even if the coil thickness changes, making welding work easier. .

In addition, by limiting the length of the metal ribbon, we give the ribbon both buckling strength and appropriate deformability, so that the metal ribbon does not peel off when stacking coils. There is no loosening of the strip ends of the holes, the work of removing the strip at the welding point is simple, and the material yield is significantly improved compared to the conventional end face welding method, resulting in great industrial advantages.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of this invention, Fig. 2 is an explanatory view of the main parts of this invention, Fig. 3 is an explanatory view of a conventional example, and Fig. 4 is a partially enlarged view of the cross section taken along line A-A in Fig. 3. be. 10: Coil, 13: Welding, 15: Metal ribbon, 16: Strip end.

Claims (1)

[Scope of utility model registration request] Spreads over the strip end of the inner hole of the metal strip coil and the innermost turn of the strip in contact with this, thickness 0.6 to 2.0 mm, width 40 mm or less, slenderness ratio 1/3 to
A temporary strip coil characterized in that one or more 1/20 metal ribbons are temporarily welded at a welding point interval of 40 to 60 mm.