JPS6264B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a welding wire for winding a spool and a method for winding the same, and in particular to a spool that allows the terminal end of the wire to be treated appropriately depending on the characteristics of the welding wire when winding the welding wire around the spool. The present invention relates to a welding wire for wrapping and a method for wrapping the same. Conventionally, welding wire is wound around a spool having a winding drum and flanges at both ends, so that the wire can be continuously supplied to, for example, an automatic welding machine. The terminal end of the wire wound around such a spool is usually inserted into a hole provided in the spool flange, bent, and fixed. However, such conventional wire winding processing methods have the following problems. That is,
First, it is difficult to automate the winding operation because it requires a separate operation to insert a thin wire into a small hole provided on the outermost periphery of the spool flange. This is because although it is technically possible to automate the work of locking the winding end of the wire, the complexity of the device structure leads to a problem in which there is a large disadvantage in terms of equipment costs. Secondly, when taking out the wire from the spool, the wire inserted into the hole must be stretched and pulled out, which requires tools and takes time to take out. The disadvantage is that there is a significant drop in work efficiency. Furthermore, since the winding end of the wire is once bent, it cannot be completely straightened even with the use of tools, and the wire cannot be smoothly fed, especially in welding equipment. Therefore, the wire ends must be cut and removed by at least the length of the wire being bent, which poses a problem in terms of yield. On the other hand, when winding up a general filament, a method has been proposed in which only the terminal end of the filament is curled (Japanese Patent Application Laid-Open No. 115462/1983), but such a method does not involve welding. It cannot be applied to wires. This is because welding wire is fed through a narrow tube by a feed motor in an automatic welding machine and used for welding. Moreover, during actual welding, the weld bead will meander, making it impossible to accurately weld the target point. The present invention focuses on the above-mentioned conventional problems, and in _particular ,
When winding a spool of welding wire, it is possible to wind the spool by simple winding work without having to perform a separate fixing work at the end of the winding, without causing any harm to the welding work. An object of the present invention is to provide a welding wire for winding a spool and a method for winding the same. In order to achieve the above object, the welding wire for spool winding according to the present invention is formed such that the free diameter at the end of the winding, that is, the diameter of the ring body made of the wire itself, is smaller than at least the final diameter of the winding on the spool. The free diameter is configured to gradually increase at a constant rate as the winding reaches the starting end. Also, using such welding wire, wind it around the winding bobbin of the spool from the winding start end on the large diameter side, and gradually wind it at the part where the free diameter becomes smaller as you reach the terminal end. The winding is tightened, and the end of the winding is self-retained by the rigidity of the wire. With this configuration, the work of winding the welding wire around the spool can be done simply by simply winding the wire, as the winding radius becomes larger than the wire's curvature radius as it reaches the end of the winding, and the wire is self-retained. It is possible to do it. At the same time, since the free diameter of the wire is gradually changed, the feeding resistance of the welding wire becomes extremely small, and the welding wire can be wound without causing any adverse effects on the welding operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, the principles of the present invention and preferred embodiments will be described in detail with reference to the drawings. As a typical example of a spool-wound welding wire, a wire with a winding weight of 20 kg has a winding diameter of approximately 250 mmφ at the outermost periphery of the spool. On the other hand, when the free diameter of the wire being wound, that is, the length of the wire loop, is cut and placed on a flat surface,
The diameter of the wire itself is usually uniformly 300 to 450 mmφ over the entire length, and as shown in FIG. 1, it is larger than the outermost diameter of the wound wire. In FIG. 1, the solid line 1 at the outermost periphery is the free diameter of the wire, and the inner broken line is the final diameter of the wire after winding. Therefore, if the wire is simply wound, the wire will unwind unless the winding end portion of the wire is secured to the spool flange. This phenomenon is thought to be because the free diameter 1 of the wire is larger than the final diameter 2 of the winding, and the rigidity of the wire itself acts in the direction of diameter expansion. Therefore, by applying the rigidity of the wire itself in the diameter reduction direction, the rigidity can be applied as a tightening force. Therefore, if the free diameter 1 at the winding end of the wire is smaller than at least the winding diameter 2, rigidity in the diameter reduction direction will act on the wire end, preventing the wire from unwinding, and the wire will not unwind. The attachment process becomes easy. This problem can be solved by making the free diameter of the wire smaller than the winding diameter. Incidentally, the free diameter at which the terminal end of the spool-wound wire can be self-retained with respect to the spool differs depending on the diameter of the bobbin around which the spool is wound, the physical properties of the wire, and the like. In addition, even if the wire can maintain its apparent self-retention, it must be able to prevent the winding from loosening or the wire from becoming tangled due to vibrations caused by handling or transportation. For this reason, in order to find an appropriate free diameter, we used solid steel wire for welding (CO ₂ welding wire).
Table 1 shows the results of testing on 20Kg wound wire.
Shown below. This is a winding spool dropped from a height of 100mm.

[Table] In this result, if the free diameter is too small, the end of the wire will come off the winding surface and the winding will be disordered, and if the free diameter is equal to the spool outer diameter, the winding will become loose, which is undesirable. Therefore, it can be understood that the free diameter should be 0.6 to 0.9 d of the outermost winding diameter. On the other hand, since the free diameter of the welding wire is an important element that affects welding workability, it is necessary to consider it from the viewpoint of improving workability. The CO ₂ welding wire wound on a spool is typically fed through a narrow tube by a feed motor for welding. Therefore, it is extremely important for welding to reduce the feeding resistance within the tube as much as possible. Therefore, although it is desirable that the wire be straight, there are secondary problems such as the wire unwinding when taken out from the spool, so the free diameter is usually set to 300 to 400 mmφ. Therefore, we conducted a test to confirm the free diameter that would not cause any adverse effects on welding workability, and the results shown in Table 2 were obtained. In this test, the wire was wound once to a diameter of 300 mm in the middle of the welding machine's conduit tube, and the wire was fed in an inching manner, and the feeding resistance was displayed as the feeding motor load current.

[Table] Although a welding wire with a wire diameter of 1.2 mmφ was used, approximately the same results were obtained in the range of 0.8 to 1.6 mmφ. Therefore, it can be understood from the above results that the lower limit of the free diameter of the welding wire is 150 mmφ. From the above, it is sufficient that the welding wire has a free diameter of at least 150 mmφ at the end of winding onto the spool, and this end can be self-retained on the winding surface, so the relationship of feeding resistance The upper part has a free diameter of 300 to 450 mmφ that will not unwind as a whole,
In particular, it is sufficient to reduce the free diameter only at the end portion of the winding. This state is shown in FIG. This is a spool-wound wire with a sharp 150mmφ only at the end of the winding.
The horizontal axis shows the length of the wire in terms of its weight, and the vertical axis shows the size of the free diameter. However, what is important for the welding wire is that during actual welding, the weld bead should accurately follow the target line and that the weld bead should not meander. This operation is extremely important as a quality issue and is a characteristic of welding wire. From this point of view, we tested the relationship between the degree of diameter reduction from the starting end of the wire to the winding end and bead meandering properties, and found that the smaller the diameter reduction rate, the better. In other words, the rate of diameter reduction is such that the maximum free diameter is 300mmφ and the minimum free diameter is 150mmφ.
As mmφ, the ratio of the free diameter difference (300-150mmφ) to the length from the start position of diameter reduction to the winding end is displayed as a slope (Figure 3), and the presence or absence of meandering of the weld bead corresponding to each slope is determined. When tested,
The results shown in Table 3 were obtained.

[Table] From this result, it can be understood that good welding work can be achieved by setting the slope to 1/50 or more. From the above, the welding wire for spool winding according to this embodiment has a free diameter smaller than the final winding diameter (250 mmφ) at the winding end, as shown in FIG. diameter. This minimum free diameter is set to 150 mmφ from the viewpoint of welding workability. Then, in order to prevent meandering of the weld bead, the diameter is gradually increased at a constant rate, and the diameter is continuously increased until the maximum free diameter (300 to 450 mmφ) is reached. this is,
On the other hand, from the winding start end side, it is equivalent to gradually decreasing the diameter toward the winding end side, and this is set to a slope of 1/50 as shown in FIG. 3.
Therefore, since the degree of diameter reduction is small, changes in the free diameter are displayed densely in the diameter reduction portion, as shown in FIG. In addition, in FIGS. 2 and 4, line A indicates a change in the free diameter. When winding the welding wire formed in this way, the winding operation is performed on the winding bobbin of the spool, with the end having a large free diameter as the starting end of the winding. Although the free diameter in this part is larger than the bobbin diameter, it is not a problem because it is tightened as the winding progresses. From the point at which the free diameter becomes smaller, the free diameter of the wire gradually begins to become smaller than the outer diameter of the winding surface, and when it reaches the end of the winding, it is self-retained by the winding surface and the end cannot be held in any way. Complete the work without fixing. In this way, the free diameter of the wire is gradually increased from the end of the winding toward the opposite end, and this end is made at least smaller than the outside diameter of the spool, making the winding process simple. It can be done only by attaching it. Moreover, since the rate of increase in diameter is small, the weld bead does not meander, making it possible to produce a high quality welded product. Therefore, the winding process can be performed extremely easily while reliably satisfying the conditions especially required for a welding wire. In addition, in the above example, the minimum free diameter is 150
mmφ, but it is clear from Tables 1 and 2 that it is not limited to this, and the degree of diameter reduction is also not limited to 1/50 from Figure 3 and Table 3, and the starting point at the beginning of the winding Of course, it is also possible to start reducing the diameter from the section. As explained above, according to the present invention, there is an excellent effect that the winding process can be performed with only a simple operation without causing any adverse effects on welding work and without performing the process of processing the terminal end of the welding wire. play.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the relationship between the free diameter of the welding wire and the final outer diameter of the welding wire, Figure 2 is a schematic diagram of the case where the welding wire is rapidly reduced in diameter, and Figure 3 is the rate of reduction in the diameter of the welding wire. FIG. 4 is a schematic diagram showing a reduction in the diameter of the welding wire according to this embodiment. 1... Free diameter of welding wire, 2... Final outer diameter of winding.

Claims (1)

[Claims] 1. In a long welding wire to be wound around a spool, the end of the winding is formed to have a free diameter (diameter made by the wire itself) that is at least smaller than the final winding diameter on the spool, and A welding wire for winding a spool, characterized in that the free diameter is gradually increased at a constant rate as it reaches a starting end. 2. One end of the welding wire for winding the spool is formed to have a free diameter smaller than the final diameter of the winding onto the spool, and the free diameter is gradually increased at a constant rate as it reaches the other end. Winding is performed on the winding bobbin with the large diameter side end as the winding starting end, and as the winding ends, the winding is gradually tightened at the part where the free diameter becomes smaller as the winding ends. A method for winding a welding wire for winding a spool, characterized in that the winding process is performed by self-holding due to the wire rigidity.