JPH09150818A - Fitting method of tag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply, rapidly, and securely fit a tag, by sticking a stud provided with a preventive part against slipping-off at one end thereof to the tag and welding the other end with a metallic rod. SOLUTION: In a process in which a specified number Ay of metallic rods Bs are sent out from a rectifier of a rolling mill, a stud 3 in which a preventive part 2 against slipping-off having a larger diameter than a fitting hole 1 formed on a tag Tg is formed at one end thereof, is inserted in the fitting hole 1 of the tag Tg and the projected end is welded with one end of an arbitrary metallic rod Bs of a bundle of rods Ay. At that time, a pilot voltage is applied to the stud 3 arranged to butt the rod. That is, pilot arc is generated between the stud 3 and the the metallic rod Bs and then the voltage is increased at a stroke and then the stud is pushed back at the time when a molten metal is formed on the metallic rod Bs and it is moved to stick to the molten metal to weld them. In this way, the tag Tg is prevented from dropping out owing to the transfer with a crane.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of attaching a tag to a metal strip.

[0002]

2. Description of the Related Art As shown in FIGS. 11 and 12, when a metal strip Bs such as a steel bar or a shaped steel is shipped, the metal strip Bs is shipped.
For each bundle Ay in which a predetermined number of
A tag Tg indicating a lot number, a size, and the like is attached. The tag Tg is generally formed by printing, engraving, sticking a seal, or the like on a thin plate made of a steel plate or an aluminum plate, and forms one metal strip Bs in the bundle Ay.
It is adapted to be connected to one end of the wire via a tag-attached linear material Wr such as a wire material.

Conventionally, such an operation of attaching the tag Tg is performed by
Everything was done manually.

[0004]

The mounting of the tag Tg is usually carried out immediately after being carried out of the refining device of the rolling equipment. At this point, the metal strip Bs is still hot (100 in the case of a strip). (Over ℃).
As a result, the working environment becomes quite harsh,
The only way to improve this is to leave the metal strip Bs until it cools. However, such a phenomenon only slows down the flow of the product, and cannot be adopted because the production efficiency and the adverse effect on the space are too large.

As a method of automating the tag attaching work, it has been considered that the tag attaching linear member Wr of the tag Tg is tied to the binding wire forming the bundle Ay. The tag Tg may fall off due to a crane movement or the like when shipping the metal strip Bs, or the tag Tg may become invisible when the bundle Ay of metal strips Bs is stacked as shown in FIG. (Arrow X
(See) and so on, and it is not suitable for practical use.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a tag attaching method which enables easy, quick, reliable and firm attachment of a tag to a metal strip.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the present invention according to claim 1 is characterized in that a stud having a retaining portion at one end is pierced into the tag and the other end of the retaining portion of the stud is welded to a metal strip.

By doing so, the tag can be firmly attached to the metal strip, and the attaching work can be simplified. Therefore, automation is possible. A bolt or the like can be used for the stud. The stud is preferably welded to the end surface of the metal strip, but may be welded to the outer peripheral surface near the end surface.

According to the second aspect of the present invention, a stud having a serrated outer peripheral surface is welded to a metal strip, and a tag is pierced into the stud before or after the welding, Is also characterized in that a retaining hole which is fitted to the protruding end side of the stud or a previously formed engaging hole in the tag is engaged with the proper position of the notch. in this case,
In order to prevent the tag from being pulled out from the stud, the engagement between the notch on the outer peripheral surface of the stud and the engagement hole formed in the retaining device or the tag is different from the case in which the retaining part provided at one end of the stud is used. We are doing it together. Therefore, either the welding of the stud to the metal strip or the insertion of the tag into the stud may be performed first.

That is, there is an advantage that the work order is not restricted. Further, the tag once attached can be replaced later. The welding is preferably stud welding (claim 3). In this case, it is only necessary to apply the current directly to the stud, and there is an advantage that the structure of the welding machine can be extremely simplified.

The welding may be performed in a shield gas atmosphere (claim 4). This makes it possible to prevent oxidation of the welded portion by blocking from the atmosphere, so that the appearance can be improved and the welding strength can be increased. It is possible to inspect for welding defects by pulling the stud from the metal strip after welding or by conducting a continuity test between the stud and the metal strip (claim 5).

That is, if the stud is properly welded to the metal strip, the stud cannot be removed even when pulled from the metal strip, and the electrical continuity between the stud and the metal strip should continue. From these, it is possible to know from these whether or not welding is being performed correctly. In addition, in the case of detecting the conduction state, if the electric resistance value is also included in the judgment material, it is difficult for the disturbance to be included in the correctness judgment of the welding (not to be confused by insufficient welding due to cracks, etc.).
Therefore, there is an advantage that high credibility can be obtained in the judgment result.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a situation in which a tag Tg is attached to a metal strip Bs by the tag attaching method according to the first embodiment of the present invention. This step is performed by, for example, a refinement device (not shown) of rolling equipment. This can be performed in the process of carrying out the metal strip Bs in a bundle of a predetermined number Ay and the like.

At this point, the bundle Ay preferably has the end faces of the metal strips Bs aligned. In this tag attachment method, a stud 3 having a retaining portion 2 having a diameter larger than that of the attachment hole 1 formed in the tag Tg is formed at one end, and the stud 3 is attached to the attachment hole 1 of the tag Tg. This is to pierce into and to weld the protruding end to one end of an arbitrary metal strip Bs in the bundle Ay.

The above welding is performed by the welding device 6 as shown in FIG.
It is performed by stud welding using. In this stud welding, the stud 3 is abutted against the metal strip Bs as shown in FIG. 3, and a pilot voltage is applied to the stud 3 in this state. Then, as shown in FIG. 4, the stud 3 is slightly separated from the metal strip Bs to generate a pilot arc between the stud 3 and the metal strip Bs. Next, the voltage is raised at once and replaced with the main arc, and when the molten pool is formed on the metal strip Bs, the stud 3 is pushed back again, and the metal strip Bs is thrust into the molten pool and waits for cooling. is there.

Reference numeral 7 shown in FIGS. 3 and 4 is a metal strip Bs.
And a tag Tg, which is an insulator that prevents a short circuit, and reference numeral 8 is a spark shield. The procedure of temporarily generating the pilot arc between the stud 3 and the metal strip Bs and then switching to the main arc is not always necessary, and the main arc may be generated from the beginning.

In the welding device 6, a support rod 11 is held so as to be able to move forward and backward with respect to the voltage applying section 10, and a chuck section 12 capable of holding the stud 3 is provided at the tip of the support rod 11. Are shown. In the voltage applying section 10, as shown in FIG. 5, the adjustable core 14 is pushed into and pulled out of the coil 15 in conjunction with the advance and retreat of the support rod 11.
A loose fitting ring 16 is fitted on the base of the support rod 11, and the loose fitting ring 16 is engaged with a hook 17 which is integrally provided with the adjustable core 14.

The support rod 11 serves as a return spring 18, the adjustable core 14 serves as an inner spring 20, and
The loose fitting ring 16 is biased by the outer spring 21 in the direction away from the coil 15 (left side in FIG. 5). Therefore, when the stud 3 is held by the chuck portion 12 and then the stud 3 is abutted against the metal strip Bs (see FIG. 3), the support rod 11 is pushed into the loose fitting ring 16 against the return spring 18. You will be able to proceed in the direction. In this state, when the coil current is turned on by the manual operation or the sensor interlocking means, the adjustable core 14
Is attracted to the excited coil 15 while resisting the inner spring 20.

Therefore, as shown in FIG. 6, the hook 17 of the adjustable core 14 causes the loose fitting ring 16 to be tilted against the outer spring 21 so that it cannot be axially moved with respect to the support rod 11. Therefore, the adjustable core 1
4, the support rod 11, the chuck portion 12 and the stud 3 are integrated and can be further attracted toward the coil 15 (to the right in FIG. 3).

As a result, a predetermined gap is formed between the stud 3 and the metal strip Bs and welding is started (see FIG. 4). After a lapse of a predetermined time, welding is stopped and the coil current is cut off, and the return spring 18 and the inner spring 2
0, each part returns by the outer spring 21. At this time,
Support rod 11 mainly by return spring 18
Returns the function of pushing the stud 3 into the molten pool of the metal strip Bs via the chuck portion 12.

After cooling the molten pool, the stud 3 is released from the chuck portion 12 so that the entire welding device 6 is retracted from the bundle Ay of metal strips Bs, but before this is performed (that is, the chuck 12 is not yet formed). When the stud 3 is held), it is preferable that the chuck 12 is slightly moved in a direction away from the metal strip Bs and a tensile force is applied to the stud 3 to determine whether welding is correct or not.

Further, whether the welding is correct or not may be determined by confirming the conduction state between the stud 3 and the metal strip Bs or measuring the resistance value. Although illustration is omitted,
In order to bring the welding device 6 close to or away from the bundle Ay of metal strips Bs (that is, the stud 3 held by the chuck portion 12 is abutted against the metal strip Bs, or retracted after welding). For example, an articulated robot or the like can be used.

By the way, during the above-mentioned welding, if a shield gas atmosphere is formed by blowing carbon dioxide gas or various kinds of inert gas to the abutting portion of the stud 3 and the metal strip Bs, oxidation at the welded portion can be prevented. As a result, it is possible to prevent the deterioration of the appearance and to improve the welding strength. Not only that, the welded part will have a metallic luster, which is useful for positively enhancing the appearance.

When forming such a shielding gas atmosphere, a spark shield 8 or the like should be provided around the abutting portion between the stud 3 and the metal strip Bs as shown in FIGS. 3 and 4. However, it works well for smooth and efficient gas convection. The present invention is not limited to the above embodiment.

For example, FIGS. 7 and 8 show the tag T attached to the metal strip Bs by the tag attaching method according to the second embodiment of the present invention.
It shows the situation of mounting g. The second embodiment differs most from the first embodiment in that the stud 3 is not provided with a retaining portion (see reference numeral 2 in FIG. 1). The stud 3 is welded to one end of the metal strip Bs, and the mounting hole 1 of the tag Tg is pierced by the stud 3, which is the same as in the first embodiment. The same applies to the fact that welding with and by stud welding is performed.

The stud 3 used in the second embodiment is provided with a notch 26 on its outer peripheral surface, and a retaining member 27 is attached as a separate member. The stopper 27 is a disk-shaped member having a cross-shaped notch 28. When the center of the notch 28 is pressed against the stud 3, the tongue pieces on all four sides warp along the notch 28. The engaging hole 30 that can be engaged with the notch 26 of the stud 3 is formed in the center thereof.

As the stud 3, a headless bolt can be used as it is to use a screw as the notch 26. Further, since the notch 26 is not limited to be formed in a spiral shape, it is possible to form multiple endless grooves on the outer peripheral surface of the bar material by forging or the like to form the stud 3.

In the second embodiment, since the retainer 27 can be attached to the stud 3 afterwards as described above, when the stud 3 is welded to the metal strip Bs,
Any of the timings of piercing the stud 3 with the tag Tg may be preceded. Therefore, for example, in the case where the stud 3 is welded to the metal strip Bs first and then the tag Tg and the retainer 27 are pierced, the welding of the stud 3 can be simplified by the amount of the tag Tg. Benefits are obtained. Also, metal strip Bs
On the other hand, there is an advantage that the tag Tg once attached can be easily replaced later.

Unlike the second embodiment, the retainer 2
It is also possible not to use 7. In this case, the attachment hole 1 formed in the tag Tg is not a “hole” but the cross-shaped notch 28 as described with respect to the retaining member 27 is formed in advance (not shown), and The configuration is such that the engaging hole 28 is formed. In each embodiment, welding is not limited to stud welding, and various other welding methods can be adopted.

[0030]

EXAMPLE FIG. 9 shows the stud 3 used in the first embodiment, and its material is SS400 at the experimental level.
However, in consideration of mass production, SWCH (carbon steel wire for cold heading) is preferable. The dimensions of each part are L ₁ = 9.0 mm, L ₂
= 9.5 mm, φ ₁ = 1.2 mm, and φ ₂ = 2.4 mm. In addition, the metal strip Bs is D10 (nominal diameter 9.53
mm) steel bar.

Then, welding was performed by setting the gap between the metal strip Bs and the stud 3 shown in FIG. 4 to 1.5 mm.
In this case, the total thickness (t) of the insulator 7 and the tag Tg
Was 4 mm. FIG. 10 shows changes in voltage (V) and current (A) when stud welding is performed under the above conditions. Area X is when a pilot arc is generated and area Y is a main arc. When it occurs. Both areas X,
The arc duration including Y was about 80 ms.

[0032]

As is apparent from the above description, claim 1
In the present invention described, the stud having the retaining portion at one end is pierced into the tag, and the other end of the retaining portion of the stud is welded to the metal strip. The mounting can be strong.
Therefore, it is possible to prevent the tag from dropping due to the movement of the crane.

Further, after attaching the stud to the metal strip, it is possible to eliminate the trouble of attaching the tag to the stud, so that the work can be simplified and speeded up. For this reason, automation can be easily performed. In addition, since the tag is always mounted in a state of protruding from the end of the metal strip in the extending direction, even when the metal strips are stacked, the tag does not become invisible.

According to the second aspect of the present invention, a stud having a knurled outer peripheral surface is welded to a metal strip, and a tag is pierced into the stud before or after the welding. Also, since the retaining hole that is fitted to the protruding end side of the stud or the engaging hole previously formed in the tag itself is engaged with the appropriate position of the notch, the tag or the retaining tool can be pierced into the stud. The tag can be secured to the stud simply by Therefore, the work sequence of welding the stud to the metal strip and the time of piercing the tag to the stud is not restricted, which further facilitates the work in welding work and the degree of freedom to replace the tag once attached afterwards. Etc. will lead to the advantage of being obtained.

If the welding is performed by stud welding (claim 3), it is only necessary to directly apply an electric current to the stud, and it is not necessary to supply a welding rod or the like. There is an advantage that the configuration of can be extremely simplified. If the welding is performed in a shield gas atmosphere (claim 4), it is possible to prevent oxidation of the welded portion by blocking from the atmosphere, so that the appearance can be improved and the welding strength can be increased. .

If the welding defect is inspected by pulling the stud from the metal strip after welding or by conducting a continuity test between the stud and the metal strip (claim 5), it is possible to ensure reliability in the attachment of the tag. Can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tag attaching method according to a first embodiment of the present invention.

FIG. 2 is a partial side view showing a welding device used in the first embodiment.

FIG. 3 is a side sectional view illustrating stud welding.

FIG. 4 is a side sectional view illustrating a procedure of stud welding following FIG.

FIG. 5 is a side sectional view showing, in an enlarged manner, the inside of the main components of the welding apparatus in FIG.

FIG. 6 is a side sectional view showing a state where the welding device is activated from the state of FIG.

FIG. 7 is a perspective view showing a tag attaching method according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing a state in which a tag is attached to a metal strip according to the second embodiment.

FIG. 9 is a side view showing a stud used in the first embodiment.

FIG. 10 is a graph showing changes in voltage and current in stud welding performed in the first embodiment.

FIG. 11 is a perspective view showing a conventional tag attaching operation.

FIG. 12 is an enlarged view of a main part of FIG. 11;

FIG. 13 is a perspective view illustrating a problem that occurs when a bundle of metal strips is stacked.

[Explanation of symbols]

 2 Detachment prevention part 3 Stud 6 Welding device 26 Jagged 27 Detachment tool 30 Biting hole Bs Metal strip Tg tag

Claims (5)

[Claims] 1. A stud (3) having a retaining portion (2) at one end is pierced into a tag (Tg), and the stud (3) is attached.
The method for attaching a tag, characterized in that the other end of the retaining portion (2) is welded to the metal strip (Bs). 2. A stud (3) having a notch (26) on its outer peripheral surface is welded to a metal strip (Bs), and
Before or after the welding, the tag (T
g), stud (3) rather than the tag (Tg)
The engagement hole (30) formed in advance in the retaining device (27) or the tag (Tg) itself that is fitted to the tip end side of the notch (2)
6) A method of attaching a tag, characterized in that the tag is engaged at an appropriate position. 3. The tag attachment method according to claim 1, wherein the welding is stud (3) welding. 4. The tag attaching method according to claim 1, wherein the welding is performed in a shield gas atmosphere. 5. The stud (3) is welded to a metal strip (B) after welding.
s) or stud (3) and metal strip (B
The method of attaching a tag according to any one of claims 1 to 4, characterized by conducting a continuity test with (s) to inspect for defective welding.