JP2002178151A - Welding wire feed roller - Google Patents

Abstract

(57) [Problem] To provide a welding wire feed roller capable of exhibiting good feedability even in a severe use environment in which feed resistance increases due to bending of a liner or the like. A grooved roller for feeding a welding wire, wherein the arithmetic mean roughness of the groove surface in the circumferential direction is Ra = 0.7.
A wire feed roller for welding, characterized by having a thickness of about 10.0 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire feeding roller used for fully automatic and semi-automatic welding.

[0002]

2. Description of the Related Art Generally, carbon dioxide gas shielded arc welding, M
For IG welding and the like, a welding wire having a small diameter (0.8 to 1.6 mmφ) is used. When using this welding wire, the wire is pulled out from a spool or a roll pack by a feed roller pair (iron or ceramic, etc.) of a feeder, and is pushed into a liner contained in a subsequent conduit cable. Via a wire to a power supply tip in a welding torch attached to the end of the cable. A voltage is applied to the wire between the power supply tip and the material to be welded, and arc welding is performed.

The liner used here is, for example, a flexible guide pipe formed by spirally winding a metal wire, and its length is usually about 3 to 6 m. It becomes 20 m long and is selected and used according to the distance to the welding point. According to this method, there is an advantage that welding can be performed relatively easily by following the cable even in a place where a welding place is narrow or has a height difference, such as a shipbuilding site. However,
If the cable is relatively straight and relatively gentle, there is no problem, but if the cable is used in harsh operating environments, such as when there are many bends, when the degree of bending is large, or when the liner is elongated, the wire will not be used. The receiving resistance increases and the feedability deteriorates. As a result, troubles such as irregular welding arcs, irregular bead shapes, poor fusion, and undercuts occur.

Heretofore, several improvement plans have been proposed for the purpose of ensuring good feedability.

As an improvement plan from the welding wire side, for example, Japanese Patent Application Laid-Open No. 58-135595 discloses a welding wire in which a specific amount of a solid lubricant is applied to the wire surface. However, it is difficult to control the amount of lubricant attached, and there are places where lubricant is excessively attached, and the lubricant is unevenly attached, which is not satisfactory. If the lubricant is excessively attached, slipping easily occurs in the feed roller.

[0006] As an improvement plan from the conduit liner side,
For example, Japanese Patent Application Laid-Open No. 9-70665 discloses that by increasing the line spacing between the liners to 0.1 to 2.0 mm, the chance of the wires coming into contact with the liner is reduced, and the lubricating oil film is less likely to break. The technology is shown. However, it is not so effective in reducing the resistance when the liner is greatly bent.

As an improvement from the feed roller side, for example, Japanese Utility Model Laid-Open Publication No. Sho 59-77570 discloses that a fine concave / convex blade surface (knurl) inclined at a predetermined angle with respect to the wire feed direction is formed in a roller groove. A feeding roller which is engraved to prevent slippage is disclosed. However, knurled eyes (0.2-
In the case of 0.6), the eyes are too large and the blades bite into the wire so that the surface of the wire is deformed, which causes an increase in resistance when passing through the liner. In addition, the amount of falling off from the wire surface increases and accumulates in the liner, which also causes an increase in resistance.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a welding wire feeder capable of maintaining a good feedability even in a severe use environment in which feed resistance increases due to bending of a liner or the like. It is intended to provide a supply roller.

[0009]

SUMMARY OF THE INVENTION The present inventor has proposed that, by roughening the surface of a feed groove of a feed roller to improve grip, even if the feed resistance is high, the slip of the feed roller can be reduced. It has been found that the generation can be suppressed as much as possible and good feeding properties can be realized, and the present invention has been completed.

The gist of the present invention is as follows.

(1) A grooved roller for feeding a welding wire, wherein the arithmetic mean roughness of the groove surface in the circumferential direction is Ra =
A welding wire feed roller having a thickness of 0.6 to 10.0 μm.

(2) The welding wire feeding roller according to the above (1), wherein the circumferential surface roughness load length ratio tp of the groove surface is 10 to 40%.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in detail.

In order to perform stable welding, a welding wire is supplied to a welding portion at a fixed constant speed.
That is, it is necessary that the feeding property is good. The wire is pushed into the liner by the feed force of the feed roller, while receiving resistance from the inner surface of the liner due to contact friction. At this time, when the feeding resistance increases due to the degree of bending of the liner being large or long, the feeding roller tends to slip, and the wire cannot be maintained at a predetermined feeding speed, and becomes unstable. According to the present invention, the surface of the feed groove of the feed roller is roughened to enhance the grip, so that even when the feed resistance is high, the occurrence of the slip of the feed roller is suppressed as much as possible, and the good feedability is obtained. To achieve.

For this purpose, in the present invention, the circumferential roughness (JIS B0601-1994) of the groove surface is regulated by the arithmetic average roughness Ra so that Ra = 0.6 to 10.0 μm. I do. More desirably, in addition to the above Ra, the roughness in the circumferential direction is determined by the load length ratio tp [cutting level Cv = 3
0%] is set to tp = 10 to 40%. Ra and tp can be obtained as an average value of the measured values in the circumferential direction at four positions at 90 ° circumferential intervals on the groove surface using a stylus type roughness meter (needle tip 5 μm).

The arithmetic average roughness Ra is an index indicating the depth of the unevenness. The reason for defining the Ra to be 0.6 to 10.0 μm in the present invention is that if the Ra is less than 0.6 μm, the height difference of the unevenness is higher. Becomes too small and slips easily.
If it exceeds μm, the height difference of the uneven part will be too large, and it will be easy to damage the wire base, the convex part will bite into the wire, and the wire surface will be deformed, increasing the feeding resistance when passing through the liner, and falling off from the wire surface Is increased, and this adheres to the groove surface and slips easily.

Next, the load length ratio tp is an index indicating the uneven shape of the wire surface.
The reason for setting it to ４０40% is that if it is less than 10%, the protruding portion becomes thin and easily worn, and it is easy for clogging to occur due to the attachment of falling objects from the wire surface. Conversely, if it exceeds 40%, there are many flat portions This is because slippage is likely to occur. In the present invention, the surface of the groove is regulated by Ra or the shape of the unevenness is specified by the combination of Ra and tp, thereby realizing low slip.

FIG. 1 shows an overall view of an example of the feeding roller of the present invention. A feed roller 1 made of steel made of carbon steel, Cr steel, Ni-Cr steel, or the like, or made of ceramic made of alumina, titania, zirconia, or the like generally has a V-groove 2 with which a wire contacts is provided around the outer peripheral surface. . In the present invention, the groove surface 3 of the V-groove 2 is subjected to a concavo-convex treatment to form a concave portion or a convex portion 4 to make it rough. For example, in the case of a steel roller, the unevenness of the groove surface 3 can be obtained by irregularly digging the surface substrate by shot blasting, etching, or the like, or by forming or engraving an uneven film by thermal spraying or the like.

FIG. 2 (photograph) shows a photograph of the groove surface of the roller example of the present invention in which the groove surface is made uneven by shot blasting, and FIG. 3 (photograph) shows a photograph of the groove surface of the conventional roller example. In FIG. 2, the surface of the groove is shot-blasted, so that irregularities are formed in the circumferential direction of the groove surface and the surface is roughened. However, in FIG. 3, since the groove surface is as-cut, the circumferential direction of the groove surface is Has no irregularities.

FIG. 4 shows a wire feeding device 5. The feeding device 5 includes a support portion 7 of a spool 6 around which a wire is wound, and a feeding portion 9 for feeding the wire to a liner in a conduit cable 8. The wire is provided for welding while being wound on a plastic spool in a unit of 10 to 20 kg.
This spool is rotatably mounted on the fixed shaft 23 of the support 7. The feed unit 9 includes a feed roller pair 11 that sandwiches and feeds a wire, a feed motor 10 that applies a driving force to the feed roller pair 11, and a straightening roller 1 that corrects a winding habit of a wire wound on a spool.
3, and an arm 14 that rotatably supports the pressure roller 12 of the feed roller pair and a part of the correction roller 13 and presses the other roller with a spring 15. Although not shown, a shielding gas cylinder such as carbon dioxide gas and a welding power source are provided, and the shielding gas and welding current from these are sent to the welding torch at the tip thereof through a conduit cable.

FIG. 5 is a view taken along the line AA of FIG. 4, and the feed roller pair 11 is a feed roller 1 having a V-groove 2 having an opening angle of about 30 ° which is driven to rotate by a feed motor 10. And this V
The pressure roller 12 presses the wire 20 into the groove 2 with a pressure of 15 to 30 kgf.

[0022]

EXAMPLES The effects of the present invention will be specifically described below with reference to examples. A feeding property test was performed by varying the roughness of the feeding roller groove surface, and the feeding performance was compared. Table 1 shows the welding wires, liners, and feed rollers used.

[0023]

[Table 1]

The feeding evaluation test was performed using the apparatus shown in FIG. In FIG. 6, the spool winding welding wire 16 set in the feeding device 5 is pulled out by the feeding roller pair 11 at a pressure of 20 kgf, and
The bead-on-plate welding is performed on the steel plate 18 for 10 minutes by feeding it to the torch 17 at the tip through the liner inside. The conduit cable 8 has a length of 10 m and is provided with a bent portion 19 formed with a plurality of loops of 100 mmφ in order to give a predetermined feeding resistance to the wire. The feeding device 5 includes a detector (not shown) for the peripheral speed Vr (= set wire speed) of the feeding roller, and a detector 21 for the actual wire speed (Vw). The slip ratio SL of the feedability evaluation index is SL = (Vr−
Vw) / Vr × 100%, and evaluated by the average value within the welding time. Further, a reaction force received by the wire from the liner was detected as a feed resistance R by a load cell 22 provided in the feed roller portion. In this test, the feed resistance R was 6-7.
The number of loops of the bent portion 19 was set to three so that the weight became kgf. Table 2 shows the evaluation criteria and Table 3 shows the welding conditions.

[0025]

[Table 2]

[0026]

[Table 3]

The results are shown in Table 4.

[0028]

[Table 4]

In Table 4, Examples 1 to 14 are Examples of the present invention, and Examples 15 to 18 are Comparative Examples.

In Examples 1 to 12 of the present invention, the arithmetic mean roughness Ra of the groove surface of the feed roller is 0.6 to 10.0 μm.
And the load length ratio tp is 10 to 10.
Since it is in the desirable range of 40%, the gripping property of the feeding roller is good, and the cable length is 10 m, and despite the high resistance, a low slip ratio of 5% or less is obtained, and the feeding property is good. In addition, the thirteenth embodiment of the present invention has a low load length ratio tp, and the falling-off object from the wire easily adheres to the feed roller groove, and the fourteenth embodiment has a high load length ratio tp. Although the slip ratio was slightly higher than that of Nos. To 12, the slip ratio was 10% or less, and the feedability was almost satisfactory.

In Comparative Examples 15 to 18, the arithmetic mean roughness Ra of the groove surface of the feeding roller was out of the range of the present invention. In Examples 15 and 16, the arithmetic average roughness Ra was slightly lower. Examples 17 and 18 are inferior in grip performance, and are slightly deviated from the wires of Examples 17 and 18, so that the surface of the wire is damaged and many of the materials fall off from the surface of the wire. As a result, in each case, the slip ratio exceeded 20%, resulting in poor feedability.

[0032]

According to the present invention, since the surface of the V-groove of the feed roller is roughened to enhance the grip, even in a severe use environment where the feed resistance is increased due to the bending of the liner or the like. It is possible to suppress the occurrence of slip as much as possible and to maintain a good feeding property.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a feed roller of the present invention.

FIG. 2 is a photograph of an example of a groove surface of a feeding roller of the present invention.

FIG. 3 is a photograph of an example of a groove surface of a conventional feed roller.

FIG. 4 is a side view of the wire feeding device.

FIG. 5 is a diagram showing a feed roller pair.

FIG. 6 is a view showing the procedure for conducting a feeding test.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 feed roller 2 V groove 3 groove surface 4 uneven portion 5 feed device 6 spool 7 support portion 8 conduit cable 9 feed portion 10 feed motor 11 feed roller pair 12 pressure roller 13 straightening roller 14 arm 15 spring 16 Welding wire 17 torch 18 steel plate 19 bent portion 20 wire 21 wire speed detector 22 load cell 23 fixed shaft

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toru Ono 7-6-1, Higashi Narashino, Narashino City, Chiba Prefecture Nippon Steel Welding Industry Co., Ltd. (72) Inventor Hiroyuki Takahashi 7-6, Higashi Narashino, Narashino City, Chiba Prefecture No. 1 Nippon Steel Welding Industry Co., Ltd. Technology Center (72) Inventor Masaki Abe 7-6-1, Higashi Narashino, Narashino City, Chiba Prefecture Nippon Steel Welding Industry Co., Ltd. Technology Center F term (reference) 3F051 BB06 BC01

Claims (2)

[Claims] 1. A grooved roller for feeding a welding wire, wherein an arithmetic mean roughness Ra of a groove surface in a circumferential direction is 0.6 to 0.6.
A welding wire feed roller having a thickness of 10.0 μm. 2. The circumferential surface roughness load length ratio tp of the groove surface
The welding wire feeding roller according to claim 1, wherein the ratio is 10 to 40%.