JPH0335023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a welding wire loading method in which a large number of loops are arranged in a flower pattern by twisting each loop at a predetermined angle in a pail pack and making them eccentric in sequence, stacked, and loaded. Regarding.

In automatic and semi-automatic welding, large-capacity welding wire storage containers are used to improve efficiency, and a typical example is a pail pack. In this method, a large amount of wire is housed in a pack, and the wire is fed to a welding torch while being straightened by a take-out device attached to the top of the pack and a straightening device of a feeder. Fully automatic welding has recently become very popular, and highly accurate construction conditions are desired. Therefore, a pallet pack loaded with twisted wire (twisted by 250° to 360° per loop) has come into use, which can eliminate weld bead meandering and arc instability caused by inversion of the wire tip. However, for example, a wire with a 360° twist in one loop is 360°/1
Due to the torsional stress of the loop, a restoring force acts, and a force that tries to spread toward the outer periphery within the pack is always working, and when the wire is released, it tends to jump up to the top of the pail pack, so when the wire is pulled out. Feeding problems such as tangles and tangles are occurring. For this reason, methods such as placing a rigid annular presser plate on top of the wire stack stored in the pail pack and pressing the wires from above have been taken, but the inside of the annular presser plate It is not possible to prevent a few wires from jumping out of the pack, so it is necessary to attach an elastic body to the inside of the annular holding plate, that is, the side from which the wires are pulled out, to suppress the wires from jumping out, or to attach a ring-shaped holding plate to the top of the inner cylinder of the pack. Although methods such as installing paper towels have been adopted, entanglement and tangling cannot be completely prevented. In other words, even if a wire holding plate is used, the wire loops are regularly eccentrically arranged in a flower pattern, and even though they are stacked, the number of loops that are supposed to be pulled out regularly from the top of the pack is small. It happens that the book is pulled out from under it. When this happens, the loop at the top of the wire being pulled out is also pulled out at the same time, and the pulled out loop becomes free, and since the loop is under torsional stress, it tries to restore itself to its original shape and turns over inside the pack, causing the upper part of the inner cylinder to The wire jumps over the ring and becomes tangled within the pack, causing tangles and preventing the wire from being fed to the welding torch, making it impossible to continue welding.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and provides a welding pail pack wire that can be smoothly drawn out without any feeding troubles such as tangling or tangles when the wire is drawn out from the pail pack. The purpose of the present invention is to provide a loading method for obtaining a charge, and its feature is that the welding wire is loaded into a pail pack by twisting each loop at a predetermined angle. A welding wire with a maximum wire tensile strength difference of 4 Kgf/mm ² or less among any three loops is fed at a constant speed, and while being guided along the inner wall of the outer cylinder, a circle between any three loops is The difference in circumference
They are bent into loops with a length of 47 mm or less, successively eccentrically arranged in a flower pattern inside a pail pack, stacked, and loaded.

The present inventor believes that the phenomenon of multiple loops jumping out, which causes entanglement and tangles when removing pail pack wire for torsional welding, is not simply caused by loops shifting due to vibrations that occur during transportation (manufacturing). (Almost the same number of jumps occur when inspecting the drawer status immediately after transport, and after transport.) In addition, each loop is regularly eccentrically dropped along the inner wall of the outer cylinder, arranged in a flower pattern, and stacked and stored. I learned that it is not related to the degree of eccentricity (pitch). The eccentric pitch of the wire loops loaded into the pail pack should be larger than the wire diameter because if it is less than the wire diameter, it will be almost concentric and will not form a flower pattern. in
800 to 850 mm) with a bulk density that can be loaded satisfactorily. The present invention is directed to welding wires currently in general use with wire diameters of about 0.9 to 2.0 mm and wire loads with loop circumferences of about 1000 to 2000 mm.

There are two methods for loading wire into a pail pack: feeding the wire into the pail at a constant linear speed, fixing the landing point of the loop, and rotating the puck itself at a constant speed to make it eccentric; There are methods such as moving the landing point sequentially to make it eccentric, but even with these methods, when observing the state of stacking and storage, it is found that even though the loop diameter and eccentricity pitch are the same (the feed rate is kept constant) , a situation can be found within a pack where one end of the loop is in contact with the outer periphery, but the other end of the same loop is protruding inside (in the center of the pack) than the normal loop, and the loop diameter also varies between packs. is observed doing. From these results, it can be seen that even if the wire is fed at a constant speed, the same loop diameter cannot necessarily be obtained. Differences in the loop diameters of the wires loaded into the pail pack are the cause of the above-mentioned wire loop jumping out, and the differences in the loop diameters are caused by fluctuations in the rigidity of the wires. In other words, if the stiffness of the wire is locally high, when that part is bent into a loop, it will rebound strongly and tend to become larger in diameter.On the other hand, since the wire is made into a loop at the same feeding speed, the adjacent loop will have a smaller diameter. There will be a difference in wire loop diameter. Since the stiffness of the wire is related to its tensile strength, by measuring the tensile strength, it is possible to know the stiffness of the wire and, by extension, whether there is a risk of the wire loop popping out.

Therefore, in the present invention, the wire is fed at a constant speed,
From inside the pale pack, which is bent into a loop shape and arranged eccentrically in a flower pattern, stacked and stored,
Several loops were taken out of the pack while being fixed so that the loop diameter did not change, each loop was cut at one end, and whether or not the same loop diameter was obtained was determined based on the circumferential length of the loop. As a result of using the above-mentioned method to determine the parts of the pack that are in a stable loading state, and the parts where one side of the loop protrudes further into the center of the pack than the normal loops, that is, the parts where loading irregularities have occurred, there is no doubt that the loading state is stable. In the part where turbulence occurs, there is more variation in the circumference length of one loop than in the stable loading part, and furthermore, the diameter of the loop protruding from the center of the pack is considerably larger than the loop diameter in the stable loading part. was.

Normally, as a method of loading a pail pack in which a wire is twisted, a wire 5 is inserted into a pail pack 10 consisting of an outer cylinder 1 and an inner cylinder 2, as schematically shown in FIG.
The flyer method, in which wires are fed through a guide 4 attached to a flyer 3 and stacked 6, is used as a simple, reliable, and inexpensive method in terms of equipment. Until one side of the loop is brought into contact with the inner wall of the cylinder 1 and fixed, the loop-shaped wire is momentarily unrestrained, and the 2-3 turn wire 5' is free. For this reason, if there is non-uniform stiffness, the equilibrium of the wires in the consecutive A, B, and C loops that are being twisted is broken, as shown schematically in Figure 2, and the stiffness of the B loop is higher than that of the A and C loops. , the diameter of loop B becomes larger, and the diameter of loop A and C increases accordingly.
The diameter of the loop becomes smaller, and thus contraction and expansion occur in the loop diameter, resulting in disordered winding. d is the diameter of the A and C loops, and d' is the diameter of the B loop.

FIG. 3 shows the relationship between the difference in circumferential length of each loop among the three loops and the tensile strength. The specifications of the experiment (the same applies to Figures 4 and 5) are the test wire...Material: Mild steel solid wire (JIS
Z3312, YCW1) Tensile strength: 85Kgf/mm ² Wire diameter: 1.2mmφ Loading conditions...Set circumference length: 1380mm, (Set loop diameter: 440mm) Pail pack inner diameter: 500mm Loading method: Pail pack rotation method (Japanese Patent Laid-Open No. 57 −
126355 method) Loading speed: 200 m/min Torsion angle: 330°/1 loop In Figure 3, the horizontal axis is the difference in circumferential length Δl (mm) of each loop in the 3 loops, and the vertical axis is the difference in tensile strength. The maximum value ΔT・S (Kgf/mm ² ) is shown. From this figure 3, a large difference in circumference means that the maximum difference in tensile strength is large, and the circumference length of the loop where the winding disorder occurred and the two loops before and after it, a total of three loops. It can be seen that the difference in , and therefore the variation in loop diameter, is strongly related to the maximum value of the difference in tensile strength. Therefore, in order to prevent winding disorder from occurring, it is effective to minimize the maximum value of the difference in tensile strength.

Figure 4 a, b, and c show the length of the wire 150 mm when the difference Δd in the diameter of the three loops is 3.2 mm, 18.7 mm, and 25.5 mm, and the difference Δl in the circumference length of each loop is 10 mm, 57 mm, and 80 mm. This figure shows the results of measuring the tensile strength of each sample. This was done by cutting three loops into one loop at a time, then cutting each loop into short wires of 150 mm each, and measuring the tensile strength of each short wire by placing it in a tensile tester.

In FIG. 4a, the maximum value ΔT·S of the difference in tensile strength is less than 1 Kgf/mm ² , and in b and c, ΔT·S exceeds 4 Kgf/mm ² . Its exact value is as follows.

When Δl=10mm, ΔT・S=1Kgf/mm ² When Δl=57mm, ΔT・S=7Kgf/mm ² When Δl=80mm, ΔT・S=12Kgf/mm ^2Wire tensile strength and therefore rigidity are They vary depending on the annealing conditions, and are large if the annealing is insufficient. Therefore, it is effective to pay attention to the annealing temperature, annealing time, the shape of the wire in the furnace, etc. in order to set the wire rigidity to a desired value. The manufacturing conditions for the test wires shown in Figure 4 a, b, and c are JIS, YCW-1 5.5 mmφ strands.
The wire was drawn to 2.4mmφ, annealed, and then further drawn to 1.2mmφ to make the product.Other steps were carried out using standard methods. The annealing conditions were as follows: Bobbin windings with dimensions of 700 mm height x 700 mm diameter were laminated, and the annealing conditions were 700° x 4 hours in a bell furnace. The wire of Example 1 of the present invention (FIG. 4a) is located outside the bobbin-wound wire and is sufficiently uniformly annealed, and the other wires are located at the center of the bobbin-wound wire. This is a wire in areas where annealing is not uniform due to temperature unevenness, such as between laminated layers and inset windings.

When a laminate is made of wires with locally large differences in tensile strength (rigidity) as shown in Figure 4 b and c,
The loop diameters vary, and even though each loop is eccentric by a pitch greater than the wire diameter, the order of the landing points of the loops is reversed, and the diameter of the next loop is larger than the diameter of the previous loop. Because it is larger, when you pull it out, it is pulled out from under the front loop,
The material protrudes from the holding plate and becomes tangled, causing tangles.

Figure 5 shows a pail pack using YCW-1 wire with a wire diameter of 1.2φ, color-coded the wires with different tensile strengths under various manufacturing conditions, and twisting them and stacking them in a loop shape. The results of an investigation of the number of times several wires jumped out from the holding plate and the number of tangles during pulling out are shown below. The outline was as follows.

(1) When ΔT・S is 5Kgf/ ^mm2 , the number of entanglements is 1
(2) If ΔT・S is 5 kgf/mm ² or more, jumping out of the presser plate, which causes entanglement, is common (4 out of 20 times). The number of entanglements increased rapidly. (3) When ΔT·S was 4 Kgf/mm ² or less, the number of jumps was extremely small, and no tangles occurred at all out of 20 times.

As is clear from the above, when the maximum value of the difference in tensile strength between the wires in the three loops is set to 4 kg/mm ² or less, variations in the loop diameters are reduced and a stable loading state can be obtained. Now, looking at Figure 3 again, the maximum value of the difference in tensile strength of the wires within the three loops ΔT・S = 4 Kgf/mm ² Since the difference in circumference length between the corresponding three loops Δl is less than 47 mm, In the end, the maximum value of the difference in tensile strength of the wires in the 3 loops is 4Kg/mm ²
Connect the following welding wires at a constant speed, and
It can be seen that it is sufficient to load the loops so that the difference in circumference length between the loops is 47 mm or less. Even if the tensile strength of the wire is uniform (ΔT・S≦4Kgf/mm ² ), uniform loading (∆l≦47mm) cannot be achieved unless the wire is fed into the pail pack at a constant speed.
In this invention, the welding wire is fed into the pail pack at a constant speed by adjusting the amount of lubricating oil applied to the wire surface, the pressure force applied to the wire by the wire supply mechanism, the wire loading speed, etc. According to the welding wire load loaded by the loading method of the present invention, when pulling out the wire, there is no need to use a special presser plate with an elastic body attached inside the disc-shaped presser plate. The phenomenon of several pieces jumping out from the presser plate is eliminated, and feeding troubles such as tangles and tangles can be completely prevented.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining how to load wire into a pail pack, Figure 2 is an illustration of disordered wire loop winding, Figure 3 is a graph showing the relationship between the difference in tensile strength and the difference in circumference length, and Figure 2 is a diagram to explain the wire loop winding disorder. FIG. 4 is a graph showing an example of the distribution of tensile strength within three loops, and FIG. 5 is a graph showing the relationship between the difference in tensile strength and the number of jumps and entanglements. In the drawings, 1 and 2 are pale packs, 5 is a welding wire, and 6 is a wire laminate.

Claims (1)

[Claims] 1. In a method of loading welding wire in which each loop is twisted at a predetermined angle in a pail pack, the maximum difference in the tensile strength of the wire in any three loops in the loading is 4 kgf/mm ² or less. The welding wire is fed at a constant speed, bent into loops so that the difference in circumference length between any three loops is 47 mm or less while being fed along the inner wall of the outer cylinder, and then eccentrically placed in the pail pack. A method for loading welding wires, which is characterized by arranging them in a flower pattern, stacking them, and loading them.