JPH1034337A - Spool for welding wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spool for welding wire in which generation of layer down of the welding wire is extremely small, and the layer down preventive property is excellent. SOLUTION: A spool 10 is provided with a cylindrical winding body part 12 and an annular flange part 13 which is extended outwardly from each end part of the winding body part 12, which are integrated with the synthetic resin. The deflection of the flange at the position corresponding to the outermost wire layer is <=6mm when the point load of 10kg is applied downwardly to the position P corresponding to the outermost wire layer where the welding wire of the rated weight is wound on an inner surface of the flange part 13 with the flange part in the horizontal posture, and the deflection of the flange per 10mm of the length in the radial direction around the position P corresponding to the outermost wire layer is <=2.0mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding wire spool used for continuously supplying a welding wire, which is a consumable electrode, to a welding portion in consumable electrode type arc welding. The present invention relates to a synthetic resin welding wire spool wound around a coil.

[0002]

2. Description of the Related Art As is well known, in consumable electrode type arc welding, a so-called small-diameter welding wire (solid wire or flux-cored wire) having a wire diameter (diameter) of 1.2, 1.4, 1.6 mm is used. It is most widely used, and this small-diameter welding wire is wound in multiple layers at a rated weight (for example, 20 kg) on a synthetic resin welding wire spool as a winding frame. Is mounted on a spool shaft, and the outermost wire layer is sequentially unwound from the spool by the operation of a wire feeding device and fed to a welding torch to perform welding.

The welding wire spool has a cylindrical winding body, and annular flanges extending outward from both ends of the winding body. PP (polypropylene), PS (polystyrene) And an ABS resin (copolymer of acrylonitrile / butadiene / styrene) and a synthetic resin called a plastic. Generally, a welding wire spool on which a welding wire is wound is rotatably supported by a spool shaft of a wire feeding device in a posture in which the axis of the winding drum is horizontal.

[0004] Incidentally, in such a synthetic resin welding wire spool, there is a problem of occurrence of a "step drop" which causes wire feeding failure. The step-down of the welding wire will be described.

FIG. 7 is a schematic cross-sectional view for explaining the occurrence of a step-down of a welding wire. On the synthetic resin welding wire spool, the above-described thin welding wire is wound in multiple layers in an aligned winding state for each layer. The term "step-down" refers to a state in which the wire loop, which should be at the end of the outermost wire layer, bites downward as shown by a black circle in FIG. 7 and enters one or more inner wire layers.

[0006] The step drop occurs during transportation of the shipped welding wire spool or when the welding wire is pulled out from the spool during welding. The main cause of this step drop is that the flange portion of the spool is forcibly pushed outward due to, for example, a large tension being applied to the welding wire during wire feeding (during welding) for some reason. It is mentioned. The step-down is most likely to occur when the welding wire exerts the greatest force on the flange portion, that is, when the welding wire of the rated weight (for example, 20 kg) wound on the welding wire spool is started to be used. As the remaining amount of wire wound around the wire decreases, the occurrence thereof tends to be greatly reduced.

[0007]

Conventionally, in order to prevent this step-down, the base of the flange portion is made thicker, or a narrow reinforcing rib extending from the base end of the flange to the distal end in the radial direction is provided on the flange portion. Although measures such as installation are taken, the relationship between the reinforcement of the flange portion and the effect of preventing step-down is not clearly understood, and it has not yet been possible to minimize the occurrence of step-down. It is a fact.

For this reason, particularly when a welding wire of a rated weight (for example, usually 20 kg) wound on a spool is started to be used, a step of the welding wire often occurs. There has been a problem that a feeding failure occurs, which causes a temporary interruption of the arc welding and lowers the welding operation efficiency.

Accordingly, an object of the present invention is to provide a welding wire spool made of a synthetic resin having a winding drum portion and a flange portion, which is excellent in step-down preventing property, in which the step-down of the welding wire is extremely small. To provide a spool.

[0010]

In order to achieve the above-mentioned object, a first aspect of the present invention is a cylindrical winding drum, and an annular flange extending outward from both ends of the winding drum. In the welding wire spool, which is integrally formed from a synthetic resin, and the welding wire is wound in multiple layers as a winding frame, for each of the flange portions, the welding wire for the rated weight on the inner surface of the flange portion. At the position corresponding to the outermost wire layer when it is wound,
When a point load of 0 kg is applied downward, the amount of flange deflection δA at the position corresponding to the outermost wire layer is 6 mm or less, and the amount of flange deflection per 10 mm in the radial direction around the position corresponding to the outermost wire layer. Quantity δB
Is 2.0 mm or less.

According to a second aspect of the present invention, in the welding wire spool according to the first aspect, each of the flange portions has a thick-walled flange reinforcing portion at an outer surface portion corresponding to a position near the outermost wire layer position. It is characterized by having. According to a third aspect of the invention, in the welding wire spool according to the first or second aspect, the flange deflection amount δA is 3 mm or less. According to a fourth aspect of the invention, in the welding wire spool according to any one of the first to third aspects, the flange deflection amount δB is 1.4 mm or less.

Each flange portion of the welding wire spool is
It is structurally considered that the base end is a “cantilever beam” fixed and supported by the winding drum section, and when the welding wire is wound in multiple layers, it causes a step-down. The amount of deflection of the flange tends to increase from the base end of the flange toward the tip. The welding wire spool according to the present invention has a predetermined weight in a horizontal position of the flange at a position corresponding to the outermost wire layer when the welding wire of the rated weight (for example, 20 kg) is wound on the inner surface of the flange. When a point load is applied downward, the two types of flange deflection amounts δA and δB at the positions corresponding to the outermost wire layers (portions where a step is most likely to occur in the flange portion).
Is regulated to be equal to or less than a specific value, so that the occurrence of stepping-down of the welding wire can be extremely reduced. The regulation of the flange deflection amounts δA and δB can be realized, for example, by providing a thick flange reinforcing portion at a flange outer surface portion corresponding to the vicinity of the position of the outermost wire layer.

That is, in the welding wire spool according to the present invention, as shown in FIG. 5, a C-type weight W having a weight of 10 kg in a horizontal posture of the flange portion is provided at a position P corresponding to the outermost wire layer on the inner surface of the flange portion. When a point load is applied downward, the amount of flange deflection δA at the position P corresponding to the outermost wire layer is 6 mm or less, and the amount of deflection δB of the flange per 10 mm in the radial direction around the position P corresponding to the outermost wire layer is 2. It needs to be 0 mm or less.

When the flange deflection amount δA is larger than 6 mm, the strength of the entire flange portion is insufficient, which is not good. On the other hand, even when the flange deflection amount δA is 6 mm or less, the flange deflection amount δB is 2.0 mm or less.
If the diameter is larger than 0 mm, the local deflection near the position of the outermost wire layer in the flange portion is large, and when using the welding wire of the rated weight wound on the spool, the step-down of the welding wire occurs. Not easy to occur.
Therefore, the flange deflection amount δA: 6 mm or less and the flange deflection amount δB: 2.0 mm or less, more preferably δA: 3 mm or less, and δB: 1.4 m
m or less is optimal, and step dropping can be reliably prevented.

The reason why the point load due to the C-type weight W is set at 10 kg is that when the point load is lighter than 10 kg, the flange deflection amounts δB and δA of the target welding wire spool are small, so that the propriety evaluation is made. Difficult to do 1
When it is heavier than 0 kg, on the contrary, the amount of flange deflection δB,
This is because, because δA is large, there is a problem that the C-type weight W that makes point contact with the flange surface slips from the outermost wire layer corresponding position P and is displaced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the respective structures of four examples of a welding wire spool according to the present invention will be described. FIGS. 1A and 1B are views showing a structural example of a welding wire spool according to the present invention, wherein FIG. 1A is a front view, and FIG.
FIG. 3 is a sectional view taken along line A.

As shown in FIG. 1, a welding wire spool 10 of this embodiment is formed integrally from a polypropylene resin, and has a cylindrical shaft portion 11 and a coaxial core formed outside the shaft portion. The cylindrical winding drum portion 12 disposed, the two annular flange portions 13 extending outward from both end portions of the winding drum portion 12, and a quadrant angle of the outer periphery of the shaft portion 11 in this example. And four radial connecting plate portions 14 each of which is formed in a position and extends radially outward and connects the shaft portion 11 and the winding drum portion 12 in a rectangular plate shape in a side view. Reference numeral 13 denotes an outer surface portion corresponding to the vicinity of the outermost wire layer position when a welding wire for a rated weight of 20 kg is wound, that is, on the outer surface of the distal end portion, from the distal end (outer peripheral) to the proximal end (inner peripheral direction). Thicker than other parts while gradually descending and tilting toward And has been stepped preventing annular thick portion 13a of the flange reinforcing portion is formed along the outer periphery.

In FIG. 1, a point P is a position corresponding to the outermost wire layer in the flange portion 13 when a welding wire of a rated weight of 20 kg is wound, and LA is a length of the annular thick portion 13a for preventing step-down. L2 indicates the length from the flange root (inner circumference) to the position P, and t1 and t2 indicate the flange thickness. In this example, spool outer diameter: 280 mm, L1 (flange length): 70 mm, SW (spool width): 87 m
m, LA ≒ L1 × (１ ／), t1 = 4 mm, t2 = 7.5 mm
It is.

FIG. 2 is a view showing another example of the structure of the welding wire spool according to the present invention, in which (a) is a front view and (b) is a sectional view taken along the line BB of (a). is there.

As shown in FIG. 2, the welding wire spool 20 of this embodiment is integrally formed of a polypropylene resin, and has a cylindrical shaft portion 21 and a cylindrical shaft 21 disposed coaxially outside the shaft portion. In this example, the winding body 22 is formed in a shape of a circle, two annular flanges 23 extending outward from both ends of the winding body 22, and the outer periphery of the shaft 21 is arranged at a quarter angle position in this example. And has four radial connecting plate portions 24 that form a rectangular plate in a side view and connect the shaft portion 21 and the winding drum portion 22.

Further, on the outer surface of each of the flange portions 23, a narrow reinforcing rib 23a extending to the distal end (outer periphery) in the radial direction at the inner periphery (base end) in this example at an octant angle position in this example.
Further, each of the flange portions 23 is formed at an outer surface portion corresponding to the outermost wire layer corresponding position P, that is, at an octant angle position of the outer periphery on the outer surface of the distal end portion, from the outer periphery toward the inner periphery. A step-down prevention reinforcing rib 23b is formed as a flange reinforcing portion which is thicker than other portions of the length LB extending in the radial direction. In FIG. 2, a point P indicates a position corresponding to the outermost wire layer in the flange portion 23 when a welding wire of a rated weight of 20 kg is wound, and L2 indicates a length from a flange root (inner circumference) to a position P. Indicates, t
1, t2: Indicates the flange thickness. In this example, spool outer diameter: 280 mm, L1 (flange length): 70 mm, S
W (spool width): 87 mm, LB ≒ L1 × (1/3), t1
= 4 mm, t2 = 7.5 mm.

FIG. 3 is a view showing another example of the structure of the welding wire spool according to the present invention. FIG. 3 (a) is a front view, and FIG. 3 (b) is a sectional view taken along line CC of FIG. is there.

As shown in FIG. 3, the welding wire spool 30 of this embodiment has a reinforcing annular thick portion 33a, as will be described later, is integrally formed of ABS resin, and has a cylindrical shaft. A cylindrical winding body 32 disposed coaxially with the outside of the shaft 31, and two annular flanges extending outward from both ends of the winding body 32. In this example, the outer periphery of the shaft portion 31 and the shaft portion 31 are arranged at quadrant angular positions, extend radially outward, and form a rectangular plate in a side view that connects the shaft portion 31 and the winding drum portion 32. And two radial connecting plate portions 34.

The outer peripheral surface of each of the flange portions 33 has a reinforcing annular shape which is thicker than other portions in a state of being gradually inclined downward from the proximal end (inner periphery) toward the distal end (outer peripheral direction). The thick part 33a is formed along the inner circumference. In FIG. 3, point P indicates a position corresponding to the outermost wire layer in the flange portion 33 when a welding wire of a rated weight of 20 kg is wound, and LC is the length of the reinforcing annular thick portion 33a, t1, t2.
Indicates the flange thickness. In this example, the spool outer diameter:
280 mm, L1 (flange length): 70 mm, SW (spool width): 87 mm, LC ≒ L1 × (１ ／), t2 = 7.
5 mm and t1 are appropriate values smaller than 7.5 mm.

FIG. 4 is a view showing another example of the structure of the welding wire spool according to the present invention, in which (a) is a front view, and (b) is a sectional view taken along line DD of (a). is there.

As shown in FIG. 4, the welding wire spool 40 of this embodiment has reinforcing ribs 43a as described later.
It is integrally molded from ABS resin,
A cylindrical shaft portion 41, a cylindrical winding drum portion 42 disposed coaxially outside the shaft portion 41, and a winding drum portion 42
And two flange portions 43 each having an annular shape extending outwardly from both ends of the shaft portion 41. The flange portion 43 is disposed at the quadrant angle position of the outer periphery of the shaft portion 41 in this example, and extends radially outward, and the shaft portion 41
And four radial connecting plate portions 44 each of which has a rectangular plate shape in a side view and connects the winding drum portion 42 and the winding drum portion 42. On the outer surface of each flange portion 43, a narrow reinforcing rib 43a is formed at the inner periphery (base end) at an equiangular angle position in this example, extending in the radial direction to the distal end (outer periphery).

In FIG. 4, point P indicates a position corresponding to the outermost wire layer in the flange portion 43 when a welding wire of a rated weight of 20 kg is wound, and t1 and t2 indicate the thickness of the flange portion. In this example, spool outer diameter: 280 mm, L1 (flange length): 70 mm, SW (spool width): 87 m
m, t2 = 7.5 mm, and t1 are appropriate values smaller than 7.5 mm.

The four types of welding wire spools 10,
A run-down evaluation test was performed on the spools of 20, 30, 40 and the comparative example. This drop-off evaluation test was carried out by the method described later. When a solid wire for welding having a wire diameter of 1.2, 1.4, or 1.6 mm was wound around a spool with a rated weight of 20 kg, drop-off of the welding wire occurred. An evaluation was made as to whether it was easy to perform.

FIG. 6 is an explanatory diagram of the step-down evaluation test.
(A) is a front view, and (b) is a plan view as viewed from an arrow A. As shown in FIG. 6, a welding wire spool in which a welding solid wire is wound with a rated weight of 20 kg (aligned winding for each layer) is supported, and a short length having the same wire diameter as the solid wire is supported. Of the pressing wire SW, one end of which is fixed so as not to move and the other end of which is connected to a spring balance (load meter) M, is connected to the spool near the flange portion of the spool. It is located on the outer wire layer. Next, the spring scale M is pulled so that the pressing wire SW bites below the outermost wire layer, and the load of the spring scale when the pressing wire SW bites inside the spool by three or more layers is measured. The measured value of the load was used to evaluate the step-prevention property. The load was 8 kg or more: （(excellent), the load was 6 kg or more and less than 8 kg: Δ (slightly inferior), and the load was 6 kg or less: × (poor).

According to the above-described method, as Test Nos. 1 to 15, PP having thick flange reinforcing portions 13a and 23a at outer surface portions corresponding to positions near the outermost wire layer position of the flange portion.
A step-down evaluation test was performed on the resin welding wire spools 10 and 20. The spools for welding wires of the comparative examples of Test Nos. 4, 9, and 14 were made of PP resin.
The spool shown in FIG. 3 has t1 = 4 mm and t2 = 7.5 mm, and the spools of the comparative examples of Test Nos. 5, 10, and 15 are as follows.
It is made of PP resin and has a structure shown in FIG.
m, t2 = 7.5 mm. Test Nos. 3, 8, 1
The spool of the comparative example of No. 3 is one in which the number of reinforcing ribs 23b for preventing step-down as the flange reinforcing portion in FIG. 2 is reduced from eight to four. Table 1 shows the results.

As Test Nos. 16-21, ABS
A step-down evaluation test was performed on the welding wire spools 30 and 40 made of resin. Examples and comparative examples having different amounts of flange deflection δA and δB were produced by changing the grade of the ABS resin and the thickness t1 of the flange portion.
Table 1 shows the results.

[0033]

[Table 1]

As shown in Table 1, the flange deflection δA
Is greater than 6 mm, or the amount of deflection δ
In the case of the comparative example in which B was more than 2.0 mm, the result was that the step of the welding wire easily occurred. On the other hand, in the welding wire spool of this embodiment, the flange deflection amount δA at the outermost wire layer corresponding position P when the welding wire of the rated weight of 20 kg is wound on the inner surface of the flange portion is 6 mm or less, In addition, since the amount of deflection δB of the flange per 10 mm in the radial direction with respect to the position P is set to be 2.0 mm or less, the occurrence of step-down of the welding wire can be extremely reduced.

[0035]

As described above, according to the welding wire spool of the present invention, the welding wire of the rated weight is wound on the synthetic resin welding wire spool having the winding drum portion and the flange portion. The amount of the two types of flange deflection at the position corresponding to the outermost wire layer on the inner surface of the flange portion when the outermost wire layer is located is determined by, for example, providing a thick flange reinforcing portion at the outer surface of the flange corresponding to the vicinity of the outermost wire layer position. Is regulated so as to be equal to or less than the value of the welding wire, so that the occurrence of stepping of the welding wire can be extremely reduced. It is possible to prevent a decrease in the efficiency of welding work.

[Brief description of the drawings]

FIG. 1 is a view showing a structural example of a welding wire spool according to the present invention, wherein FIG. 1 (a) is a front view and FIG. 1 (b) is a sectional view taken along line AA of FIG. 1 (a).

FIG. 2 is a view showing another example of the structure of the welding wire spool according to the present invention, in which (a) is a front view and (b) is a cross-sectional view taken along line BB of (a).

3A and 3B are diagrams showing another example of the structure of the welding wire spool according to the present invention, wherein FIG. 3A is a front view and FIG. 3B is a cross-sectional view taken along line CC of FIG.

4A and 4B are diagrams showing another example of the structure of the welding wire spool according to the present invention, wherein FIG. 4A is a front view, and FIG. 4B is a cross-sectional view taken along line DD of FIG.

FIG. 5 is a diagram for explaining a flange deflection amount according to the present invention.

FIG. 6 is an explanatory diagram of a step-down evaluation test, in which (a)
Is a front view, and FIG.

FIG. 7 is a schematic cross-sectional view for explaining occurrence of a step-down of a welding wire.

[Explanation of symbols]

10,20,30,40 ... Spool for welding wire 1
1,21,31,41 ... Shaft part 12,22,32,42
… Winding body part 13,23,33,43… Flange part 13a
... Annular thick portion 23a for step-down prevention 23. Reinforcing rib 23
b: Step-down prevention reinforcing rib 33a Reinforced annular thick portion
43a: Reinforcing ribs 14, 24, 34, 44: Radial connecting plate W: C-shaped weight P: Position corresponding to the outermost wire layer δA, δB: Flange deflection

Claims (4)

[Claims] 1. A winding body having a cylindrical winding body, and annular flanges extending outward from both ends of the winding body. In the welding wire spool wound around, for each of the flange portions, the flange portion horizontal position at the position corresponding to the outermost wire layer when the welding wire of the rated weight is wound on the inner surface of the flange portion. When a point load of 10 kg is applied downward, the amount of deflection δA of the flange at the position corresponding to the outermost wire layer is 6 mm or less, and the length per radial length 10 mm around the position corresponding to the outermost wire layer. 1. The flange deflection amount δB is 2.
A welding wire spool having a diameter of 0 mm or less. 2. The spool for a welding wire according to claim 1, wherein each of said flange portions has a thick flange reinforcing portion at an outer surface portion corresponding to a position near an outermost wire layer position. . 3. The spool for a welding wire according to claim 1, wherein the flange deflection amount δA is 3 mm or less. 4. The flange deflection δB is 1.4 mm.
The welding wire spool according to claim 1, wherein: