JPH04274875A - How to load welding wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading method for stacking and storing welding wires in a pail pack in the form of a loop while twisting the wires.

0002

2. Description of the Related Art In automatic and semi-automatic welding using welding wire, large-capacity wire storage containers are used for the purpose of improving efficiency, and typical examples include paper or iron pail packs. The wires are taken out from the pail pack in the following order: starting from the top of the loop-shaped stack, the wires are pulled out to the outside of the pail pack and guided to the welding torch through a conduit tube. However, the wire taken out in this manner has the disadvantage that the tip of the wire that exits the welding torch and performs welding is reversed (curved) and the weld bead becomes meandering because the wire is twisted by approximately 360 degrees per turn when taken out. Therefore, when loading the welding wire into the pail pack, the wire is given a reverse twist within the elastic limit beforehand, and by counterbalancing the twist received when taking it out, the twist of the wire coming out of the welding torch is reduced. A method to eliminate this has been put into practical use.

FIG. 1 shows how the twisted wires are stacked in this pail pack. FIG. 1(a) is a sectional view of a welding wire charge, and FIG. 1(b) is a sectional view taken along line A-A in FIG. 1(a). As shown in the figure, the pail pack 1 consists of a cylindrical part 2 with an inner diameter of about 450 to 700 mm and a bottom plate part 4, and the space inside this pail pack has a wire diameter of 0.8 to 2.0 mm.
A welding wire of about 270° to 45mm within the elastic limit
Within the torsion range of 0°/1 loop, for example, if each wire loop is twisted approximately 360°, the loop diameter is 400°.
They are stacked and stored in a loop shape of about ~600 mm. In the stacked and stored state of the wires, as shown in (a), the outer periphery of the wire laminate 3 is in contact with the inner wall of the cylindrical portion 2 of the pale pack 1, and the inner periphery forms a cavity. In addition, each layer of the stacked wires has a flower pattern shape as shown in (b), and the center of each wire loop L forms a circle B centered on the central axis C of the pail pack 1. Looking at the entire stack of wires, the locus drawn by the center of the continuous wire loop L is housed in a spiral shape with the central axis C of the pail pack as the axis. If the twisted welding wires are stacked and housed in the pail pack in this manner, there will be no tangles, tangles, etc. when the wires are taken out, and the wires can be smoothly taken out and upward from the pail pack.

[0004] For example, Japanese Patent Publication No. 62-825 and Japanese Utility Model Publication No. 1982-825 are known as loading methods for realizing such twisted welding wires being stacked and housed in a pail pack.
A method using a loading device disclosed in, for example, No. 10217 is known. FIG. 2 shows an example of this loading device. In this figure, 1 is a pale pack, 2 is its cylinder part, 3 is a wire laminate,
11 is a guide tube, 12 is a support tube, 13 is a guide pipe, the guide tube 11 is stationary, and the guide pipe 13 is the support tube 12.
It rotates at high speed while wrapped around. Reference numeral 16 denotes a rotary table, which is fixed to a rotary shaft 20d that is rotated by a drive motor 20a on a rotary table support base 20. The pail pack 1 is placed on the table 16 and rotated at low speed. Table rollers 16a, stoppers 16b,
16c is provided. 17 is a lifting table of the lifting mechanism 19, and 17a is a guide post thereof. wire W
comes out from the rotating guide pipe 13 and moves to the stationary guide tube 1.
The wire falls spirally while wrapping around the lower protrusion 11a of the wire laminate 3, and lands on the upper surface of the wire laminate 3. Reference numeral 15 denotes a member projecting diagonally downward and attached to the lower end of the protruding portion 11a of the guide tube 11, and forces the wire falling through this portion toward the inner surface of the tube portion 2.

The loop formed by the wire W has a smaller diameter than the inner diameter of the cylindrical portion and is pushed toward the inner surface of the cylindrical portion by the protruding member 15, so the wire loop shifts and falls while contacting the inner surface of the cylindrical portion, while the wire loop 2 As it rotates, the wires are stacked in a flower pattern. Reference numeral 14 is a member that projects directly downward and is attached to the lower end of the guide tube 11, and suppresses the inner surface of the wire stack 3 to form a cylindrical shape with no unevenness. It is preferable that the distance between the lower end of the guide pipe 13 and the upper surface of the wire stack 3 is within a certain value, so that the elevating mechanism 19 gradually lowers the elevating table 17 while loading the wire into the pail pack. Keep the spacing constant. A proximity switch 21 detects the top surface of the wire stack 3, and gradually lowers the table 17 by a lifting mechanism 19 so that the top surface is always in front of the proximity switch 21, thereby making the above-mentioned interval constant.

[0006] Next, characteristics that the welding wire loaded in the pail pack should have include wire feedability and straightness. First, welding wire has a tensile strength of 6 from the viewpoint of feedability.
A range of 0 to 150 kgf/mm2 is preferable. That is, the wire is sent through a conduit cable with a length of about 5 to 10 m by a feeding roller and is used for welding.
In order to continuously perform stable welding, it is necessary to maintain good wire feedability. Tensile strength is 6
If it is less than 0 kgf/mm2, it will easily buckle between the feed roller and the conduit cable entrance during feeding, making feeding unstable or impossible.
If the tensile strength of the wire exceeds 2, the frictional resistance within the conduit cable will be excessive, resulting in a knocking phenomenon and unstable feeding performance. Therefore, it is preferable that the tensile strength of the wire is within the above range.

[0007] Also, from the point of view of straightness of the wire, it is preferable that the tensile strength is 90 kgf/mm2 or more. In other words, as the automation of welding progresses, the straightness of the wire has become more important as a characteristic required of the wire. This is because if the wire coming out of the torch is bent, the weld bead will meander and the appearance of the bead will deteriorate, as well as poor penetration into the weld area.
This is because welding defects such as slag entrainment are likely to occur, and the quality of the welded part will deteriorate. As mentioned above, since the wire is given an opposite twist to offset the twist that occurs when the pail pack is loaded and taken out, the twist of the wire coming out of the welding torch is basically eliminated. However, in reality, even in the case of a wire packed in a pail pack to which such treatment has been applied, the wire that comes out of the torch may be bent, resulting in a non-negligible meandering of the bead. The cause of this is that friction on the inner surface of the conduit cable in the narrow feeding path between the pail pack and the welding torch and feeding resistance due to bending act on the wire, causing it to bend plastically. This tendency is noticeable in wires with a tensile strength of 90 kgf/mm2 or less.
0 kgf/mm2 or more is preferable.

In the end, a wire with a tensile strength of 90 to 150 kgf satisfies both feedability and straightness when using the wire.
/mm2 range is used. However, when using steel wire for welding in a pail pack, which is made by twisting the wire into a loop and loading it into the pail pack, the feeding performance is stable and the straightness is excellent, so it can be used as a conduit. It becomes possible to supply a wire with little twist from the tip of the torch while maintaining stable feeding performance regardless of the arrangement or bending shape of the cable.

[0009]

However, it has been found that the following problem occurs when such relatively rigid welding wire is loaded into a pail pack using the above-described loading method. This will be explained with reference to FIG. Figure 3 (
a) is an explanatory diagram of a poor landing state of the loop when loading the wire;
FIG. 3(b) is an explanatory diagram of the state in which tangles occur when the wire is taken out. Guide pipe 1 rotating as explained in Figure 2
The wire discharged from the outlet of 3 is approximately 360 wires per loop.
It falls while forming a loop with a twist of °. This loop is shifted by the protruding member 15 so that one end of the loop comes into contact with the inner surface of the cylindrical portion 2, and in this contact state, it falls and lands on the upper surface of the wire stack. However, the wire is approximately 360°
Since it is given a twist of /1 loop, there is an inherent restoring force that tries to release the twist and return to its original state, which tends to press against the inner surface of the cylindrical portion. This tendency is due to the high rigidity of the wire (tensile strength 9
0 to 150 kgf/mm2), and the inner surface of the cylindrical portion is pressed more forcefully, which increases the contact resistance from the inner surface of the cylindrical portion, and this resistance prevents the wire from landing smoothly on the upper surface of the wire laminate 3. As a result, as shown in FIG. 3(a), the landing order of the loops coming out of the guide pipe and landing on the upper surface of the wire stack 3 is distorted. In other words, the trailing loop L2 will land before the leading loop L1, which should land first. In this case, the good lamination state shown in FIGS. 1(a) and 1(b) will no longer be achieved, and as a result, as shown in FIG.
As shown in (b), tangles 6 occur when the wires are taken out, and the wires W cannot be smoothly supplied to the conduit cable 5.

The present invention solves the problems of the prior art, and allows even wires with relatively high rigidity and excellent straightness and feedability to be smoothly inserted into the pail pack while maintaining a good stacked state. An object of the present invention is to provide a method for loading welding wire.

[0011]

[Means for Solving the Problems] The welding wire of the present invention is characterized by a loading method for twisting the welding wire into a loop shape and stacking and storing it in a pail pack. 0.8-2.0mm, tensile strength 90-1
Welding wire of 50 kgf/mm2 is twisted into a loop shape, and the static friction coefficient between the wire and the wire is regulated to 0.30 or less.While the inner surface of the pail pack cylinder is regulated to 0.30 or less, the wire is eccentrically eccentric and stacked inside the pail pack. It's about doing.

The welding wire of the present invention has a wire diameter of 0.8 to
Steel wire with a small diameter of 2.0 mm has a tensile strength of 90 to 15
The wire has a relatively high rigidity of 0 kgf/mm2 and has good feedability and straightness. This wire is twisted at a rate of about 270° to 450° per loop within the elastic limit to form a loop with a loop diameter of about 400 to 600 mm and an inner diameter of 45 mm.
They are stacked and stored in a pail pack of about 0 to 700 mm while being eccentrically arranged along the inner surface of the pail pack's cylindrical part. The amount of twist of the loop, the loop diameter, the inner diameter of the pail pack (cylindrical portion), etc. are within the numerical range of pail packs commonly used at present.

[0013] In order to regulate the coefficient of static friction between the wire and the inner surface of the pail pack cylinder to 0.30 or less, the inner surface of the cylinder is coated with a material having good sliding properties. For example, a resin such as vinyl chloride resin, vinyl acetate resin, or urea resin is coated on the inner surface of the paper or iron pail pack cylinder. Alternatively, apply lubricating oil to the wire surface. For example, add 0.4 to 3.0 g of vegetable oil, mineral oil, or a mixture thereof.
By means of attaching about 10 kg of wire or the like. However, it is not easy to reduce the coefficient of static friction to 0.30 or less simply by coating the inner surface of the cylindrical portion with a resin. Further, if only lubricating oil is applied, it is necessary to apply a relatively large amount of lubricating oil, but adhesion of a large amount of lubricating oil causes deterioration in wire feedability. Specifically, when more than 2.0g/10kg of lubricant is attached to the wire and welding is continued for several hours, the lubricant attached to the wire surface will cause peeling or dust to adhere to the wire surface. However, it is gradually pushed in the direction in which the wire travels, and eventually accumulates inside the contact tip, causing trouble in wire feeding. Therefore, the amount of oil adhesion on the wire surface should be 0.4 to 2.0.
In order to obtain the desired coefficient of static friction, it is desirable to adopt a method of coating the inner surface of the cylindrical portion with a slippery material while limiting the weight to g/10 kg wire.

[0014]

[Operation] The welding wire targeted by the present invention has a tensile strength of 90 to 150 kgf/mm2 with good feedability and straightness.
It is a relatively rigid wire. As mentioned above, when such a highly rigid wire twists to form a loop, a strong restoring force acts and presses the inner surface of the pail pack cylinder, so the contact resistance prevents the wire from landing on the top surface of the wire stack. . This contact resistance, that is, the maximum static frictional force F is proportional to the static friction coefficient μ between the wire and the inner wall surface of the cylindrical portion and the pressing force N against the inner wall surface of the cylindrical portion due to the restoring force of the wire loop (
F=μN). The pressing force N is a wire diameter of 0.8 to 2.0 mm,
A welding steel wire with a tensile strength of 90 to 150 kgf/mm2 is twisted approximately 360°/loop, and the loop diameter is 40°.
This is the force exerted by the wire loop on the inner surface of the cylindrical portion when the wire loop is made into a twisted loop of 0 to 600 mm, and is a difficult requirement to adjust because the product quality and loading form are determined. On the other hand, the static friction coefficient μ is a requirement that is not directly related to the defined product quality or loading form, so in this invention, the static friction coefficient μ is adjusted to 0.30 or less to reduce the contact resistance F, and the Make sure that the falling wire loop is not obstructed.

In this invention, since the coefficient of static friction between the wire and the inner surface of the pail pack tube is limited to make it easier to slip, in the process of the wire loop exiting the guide pipe and landing on the wire lamination surface, the tube portion Even if it comes into contact with the inner surface, the fall will not be stopped due to the contact resistance received from the inner surface. Therefore, as shown in Fig. 3(a), the landing order is not distorted, and the preceding loop L that comes out from the guide pipe first
1 always lands before the trailing loop L2. As a result, the ideal loading state shown in FIG. 1 can be achieved.

[0016]

[Example] Table 1 shows the effects of the loading method according to the present invention together with comparative examples. The wire was loaded using the apparatus shown in FIG. Test wire: JIS Z3312, YGW11 steel wire Wire diameter: 1.2 mm, surface steel plated Tensile strength: 105 kgf/mm2 Loading conditions: Loading speed: 150 m/min Loop diameter: 440 mm Torsion amount: 360°/1 loop Pail pack: Cylindrical portion is Made of paper and the inner surface is JIS P3
Inventive Example No. 103 was used, and the inner diameter of the tube was 505 mm.As is clear from Table 1, the coefficient of static friction between the wire and the inner surface of the pale pack tube was 0.30 or less. In Nos. 2, 3, 4, 6, and 7, the wires were laminated in a good state, and as a result, no tangles occurred when the wires were taken out. However, No. 2
, 7, the amount of lubricating oil applied exceeds 2.0 g/10 kg wire, so the wire feedability deteriorates over time. However, as mentioned above, there is no problem with welding for a short period of time of several hours, and if the wire feeding performance deteriorates, the conduit cable and tip can be replaced with new ones, so it is fully usable. .

[0017]

[Table 1]

[0018]

Effects of the Invention As explained above, according to the welding wire loading method of the present invention, the wire has a wire diameter of 0.8 to 2.0 mm, which has good feeding performance and straightness when used, and has a tensile strength. Sa9
When a high-rigidity wire of 0 to 150 kgf/mm2 is twisted and loaded into the pail pack, a good stacked state can be maintained and the wire can be loaded smoothly into the pail pack. Therefore, when using the wire from the loaded pail pack according to this explanation, it can be smoothly taken out of the pail pack without any problems such as tangling, and the taken out wire is fed well and exhibits excellent straightness. .

[Brief explanation of the drawing]

FIG. 1(a) is a cross-sectional view of a welding wire charge. (b) is a sectional view taken along line A-A in (a).

FIG. 2 is a sectional view showing an example of a welding wire loading device.

FIG. 3(a) is an explanatory diagram of a state in which the loop lands poorly during wire loading. (b) is an explanatory diagram of a state in which tangles occur when wires are taken out.

[Explanation of symbols]

1 Pale pack 2 Cylinder part 3 Wire laminate W Wire L Wire loop L1 Preceding loop L2 Trailing loop

Claims (1)

[Claims] 1. A loading method for twisting welding wire into a loop shape and stacking and storing the wire in a pail pack, the wire having a diameter of 0.8 to 2.0 mm and a tensile strength of 90 to 150.
Welding wire of kgf/mm2 is twisted into a loop shape, and the static friction coefficient between the wire and the wire is regulated to 0.30 or less.While the inner surface of the tube of the pail pack is regulated, the wire is eccentrically eccentric and stacked inside the pail pack. A method for loading welding wire, characterized by: