JPH0360588B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for joining welding wires stored in a pail container, and more specifically, the present invention relates to a method for joining welding wires stored in a pail container, and more specifically, the present invention relates to a method for joining welding wires stored in a pail container, and more specifically, the present invention relates to a method for joining welding wires stored in a pail container.
When the welding wire is used up and the starting end of a new packed wire is welded to the terminal end of the previous packed wire for continuous welding, the continuous feeding of the welding wire (hereinafter simply referred to as wire) may be affected. This invention relates to a method for splicing packed wires without causing any trouble. [Prior Art] In a line that mass-produces welded products, it is necessary to continuously supply wire. To deal with this, the user must sequentially weld the end face of the wire on the previously consumed pack (hereinafter simply referred to as the preceding pack) and the wire starting end face on the next use pack (hereinafter simply referred to as the next pack). In order to facilitate this welding and splicing work, consideration is given so that the starting end and the terminal end of the packed wire are in a standby state, respectively, outside the pail container. By the way, there are two types of packed wires that take wire splicing into consideration, which will be briefly explained below with reference to the drawings. That is, FIG. 1 is a partially cutaway front view illustrating one form of the container.
and a bottom plate 3. Ear 6 is cylinder 2
The containers are stored in a curved loop so as to be inscribed in the container, but the most common method is to sequentially stack the containers while turning the center of the loop in a circular locus concentric with the container. The top surface of the wires 6 stacked and stored in this way has a hole 9 in the center.
A donut-shaped wire holding member 4 having a diameter of 100 mm is placed thereon, and its own weight prevents the stored wire 6 from springing up. Further, the wire 6 stored in the pail container 1 has a winding start end 6a (which becomes a wire end when the wire is drawn out) projected upward, and the wire 6 continuing from the winding start end is directed toward the inner surface of the cylinder 2. The container 1 is lowered to reach the bottom surface, and then stored in a coiled manner inside the container 1 in a stacked manner. Then, the winding end portion 6b (which becomes the wire starting end when the wire is drawn out) is pulled out from the hole 9 of the holding member 4, and the winding starting end portion 6a (which becomes the wire terminal end when the wire is drawn out) is also pulled out from the hole 9. The drawers are each placed on standby outside the container 1 (so-called inner drawer standby). As described above, the wire 6 is stored while being curved in a loop shape so as to be inscribed in the cylinder 2 of the pail container 1, so that the wire starting end 6b
is pulled out in a circular manner in a clockwise or counterclockwise direction while rubbing against the inner edge of the wire holding member 4, while the wire starting end 6a is drawn out in a circular manner in a clockwise or counterclockwise direction, while the wire starting end 6a is pulled out in a direction opposite to the drawing direction of the wire starting end 6b. Start drawing a circle in the direction. Further, FIG. 2 is a partially cutaway front view illustrating a form when wire splicing is taken into consideration in a packed wire in which the wire 6 is housed in a pail container 1' having an inner cylinder 11, and is similar to that in FIG. The difference from the configuration is that the winding end end 6b and winding start end 6a of the wire are both pulled out from the hole formed between the outer peripheral surface of the presser member 4 and the cylinder 2 and are waiting. (so-called external drawer standby). No matter which of the above two types of pack wires are used, if the next pack is placed side by side before the wires of the previous pack run out, the wire end of the previous pack side and the wire of the next pack side The starting end surface can be easily welded (for example, butt welded), and the burden on the user's side required to ensure continuous supply of wire is significantly reduced. However, even if the wires are welded together in advance as described above, the wires may become clogged or tangled at the wire outlet provided approximately in the middle of the preceding pack just before the wire drawer moves from the preceding pack to the next pack. It has become clear that this occurs frequently and, in extreme cases, may lead to the wire feeding being stopped. In other words, the wires stored in the pack are generally twisted in the opposite direction (one turn per revolution) when being pulled out, which ensures smooth feeding after the wire is pulled out, but the loop-shaped wire at the lowest position When the wire is released from the restraint by the wire holding member, the loop-shaped wire rotates several times in the lateral direction within the pail container due to the above-mentioned torsional force applied to the wire, and as shown in FIG. It is easy to become a loop-shaped wire having a plurality of tangle points 12 at the same time. For this reason, it has been found that the wires become clogged or tangled at the wire outlet 13, which is either fixed to a wire feeding device (not shown) or is disposed via the flexible tube 14 approximately in the middle above the leading pack. However, automatic welding equipment such as robots are often used in production lines that perform wire splicing and continuously supply wire, and once wire feeding stops, it can be critical to the smooth operation of these equipment. Therefore, there has been a strong desire from the user side to develop a means to avoid such a stoppage of wire feeding. [Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to perform wire splicing without any hindrance to the continuous feeding of the wire. The goal is to provide a way to do so. [Means for Solving the Problems] The wire splicing method of the present invention that achieves the above object is to place two wire storage packs side by side, and connect the wire end face of the preceding pack and the wire start end face of the next pack. In the welding method, the position of the rubbing point between the wire terminal end of the preceding pack and the inner edge or outer edge of the wire holding member of the pack is at an angle from 0° with respect to the line connecting the centers of the two packs when viewed from above. Connect the wire so that it is 135° counterclockwise (when the wire is pulled out in a counterclockwise direction) or 135° clockwise from 0° (when the wire is pulled out in a clockwise direction). The gist lies in what it does. [Operations and Examples] The structure and operation effects of the present invention will be explained below based on the history of experiments and considerations by the present inventors. The inventors of the present invention were able to obtain the following knowledge by carefully observing the phenomenon of wire feeding troubles that occur during conventional wire splicing. However, since the content of the findings is not particularly different between the so-called inner drawer type pack shown in Fig. 1 and the so-called outer drawer type pack shown in Fig. 2, the inner drawer type pack will be taken as a representative below.
I will avoid redundant explanations. As shown in FIG. 4A (schematic perspective view), the longer the total length of the wire in the pail container 1, which is the sum of the length of the feeding wire A and the length of the relay wire (corresponding to the wire terminal part) B, becomes more troublesome. is likely to occur. As shown in FIG. 4B [schematic plan view of FIG. 4A], when the pail container 1 is viewed from above, the relay side wire rod is located at a position away from the wire presser plate member 4, that is, at the inner edge of the wire presser plate member 4. Rubbing point position P
Depending on the condition, the above trouble may be more likely to occur. Based on the above findings, the present inventors have found that wire feeding troubles are greatly influenced by the relative relationship between the position of the wire end on the preceding pack side to which wires are to be spliced and the position of the wire end end on the next pack side. Therefore, if this relative positional relationship is properly regulated, wire feeding troubles should be prevented. We were able to come up with a solution. Based on this guideline, an experiment was conducted in the following manner to investigate the causal relationship between the wire joint positions between the two packs and the wire feeding trouble, and the experimental results shown in Table 1 were obtained. Experimental procedure When welding wires are stacked and stored in a loop shape, there are two ways to store them: one is to store them in a clockwise direction when viewed from above, and the other is to store them in a counterclockwise direction. In the following experiment shown in FIGS. 5 and 6, a pack in which the wire was housed in the clockwise direction B was used.
When pulling out the wire, counterclockwise rotation direction A is a natural and straightforward direction. As shown in Figure 5 (schematic plan view), the preceding pack (wire amount 5 kg) and the next pack (wire amount 250 kg)
Kg) are placed side by side with a distance of about 100 mm, and the relay side wire (1.2〓) on the leading pack side leaves the wire holding member 4 at the position P (the rotation angle in the clockwise direction with the line connecting the centers of both packs as the base line). (indicated by θ), pull out the relay side wire wire, connect the wire with the supply side wire (1.2〓) on the next pack side, and connect the supply side wire on the preceding pack side to the wire installed vertically above the page. The wire was recovered through the wire exit, and the situation was investigated when transferring from the wire leading pack side heading for the wire exit to the next wire pack side. In this experiment, a wire holding member 4 having a notch 4a as shown in the figure was used in consideration of ease of pulling out the wire, but as mentioned above, it is possible to use a wire holding member without a notch 4a. In this case, the position away from the relay-side wire holding member on the preceding pack side becomes a sliding point P with the inner edge of the wire holding member 4, as shown in FIG. 4B. Note that each experiment was conducted three times under the same θ setting. The results are shown in Table 1 using the following ○ and ×. 〇: No wire feeding troubles mentioned above occurred. ×: Wire feeding troubles occurred during transfer.

〔Effect of the invention〕

Since the present invention is constructed as described above, as long as the wire end face of the currently used pack is connected to the wire starting end face of the next pack at an appropriate time while the wires of the currently used pack are still running out, The wire can be smoothly fed semi-infinitely, which is extremely useful in applications such as continuous automatic welding lines.

[Brief explanation of drawings]

Figures 1 and 2 are partially cutaway front views illustrating conventional packed wires, Figure 3 is a schematic diagram for explaining the problems of the conventional wire joining method, and Figures 4 to 7.
The figure is a schematic diagram for explaining the experimental study process of the present invention. DESCRIPTION OF SYMBOLS 1... Pail container, 4... Wire pressing member, 6... Storage wire, 6a... Wire terminal end part, 6b... Wire starting end part, 9... Hole.

Claims (1)

[Claims] 1 Welding wires are stacked and stored in a loop shape in the internal space of a vertical cylindrical pail container, and a donut-shaped wire holding member with a hole in the center is placed on top of the stack of wires, and A starting end of the wire pulled out to the outside of the welding wire storage pack in a circular manner in a clockwise or counterclockwise direction while rubbing against the inner edge or outer edge of the wire holding member when viewed from above, and the starting end of the wire. Two welding wire storage packs each having a wire terminal end pulled out to the outside of the pack in a circular manner in the direction opposite to the pulling direction of the welding wire storage pack are placed side by side, and the wire end surface on the pre-consumption pack side In the method of sequentially splicing the starting end of the wire on the side of the pack to be used next time, the position of the rubbing point between the end of the wire on the side of the previously consumed pack and the inner edge or outer edge of the holding member on the pack side is the same as that of both packs when viewed from above. Using the line connecting the centers as the base line, rotate 135° counterclockwise from 0° (when the wire is pulled out in a counterclockwise direction) or 135° clockwise from 0° (however, when the wire is pulled out in a clockwise direction) A wire splicing method for welding wire in a pack, characterized by splicing the wire so that the wire is located at