JP2000136070A - Spooled welding wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a wire surely without coming out from a spool, even if the wire for welding is the wire containing a flux, by forming the initial end of the wire formed inside the wind trunk through the hole for inserting the wire of the wind trunk of the spool in a loop state. SOLUTION: The tip of the wire W for welding is set in the state that the tip of it is inserted from the hole 12a for inserting the wire of a spool 10 mounted on the flange 21 for mounting the spool in the inside of a wind trunk 12 and is passed through the space between the pins 23a, 23b for forming a loop facing each other. The pins 23a, 23b for forming the loop are rotated in a clockwise direction around the center of a pin rotation axis 22 and the initial end WS of the wire WS with a closed loop shape on a plane view is formed. When the wire W for welding is extracted and the residual amount of the wire gets less at the welding time and the tensile force by the wire extraction is applied to the initial end WS of the loop shape wire, it is held so as to be squeezed and fixed to the spool 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a spool winding welding wire in which a welding wire is wound in a coil shape around a spool (winding frame), and in particular, the welding wire is a flux-cored wire (made of thin steel). The present invention relates to a spool winding welding wire that can securely stop a wire starting end portion on the winding start side with respect to a spool without coming off even in the case of a wire having a flux filled in an outer sheath.

[0002]

2. Description of the Related Art A welding wire continuously supplied as a consumable electrode to an arc welding portion is used in the form of a spool-wound welding wire wound around a spool. That is, in the consumable electrode type arc welding, the wire diameter is φ1.2 m.
The so-called small-diameter welding wires (solid wires, flux-cored wires) of m, φ1.4 mm and φ1.6 mm are most widely used, and these small-diameter welding wires are formed of plastic spools (winding wires). Frame) is mounted on a spool shaft of a wire feeder in a state of being wound in multiple layers with a rated weight of, for example, 20 kg. The wire feeder is operated and the spool is unwound from the outermost wire layer to the welding torch. Sent and welded.

FIG. 1 is a front view of a spool, and FIG. 2 is a plan view showing an example of a wire insertion hole provided in a winding drum portion of the spool shown in FIG. As shown in FIG. 1, generally, a spool 10 has a cylindrical shaft portion 11, a cylindrical winding body portion 12 arranged coaxially with the outside of the shaft portion 11, and around which a welding wire is wound. The two annular flange portions 13 extending outward from both ends in the axial direction of the winding body portion 12 and the outer periphery of the shaft portion 11 are disposed at six equally angled positions in this example and extend radially outward. And six radial connecting plate portions 14 for connecting the shaft portion 11 and the winding drum portion 12 and are integrally formed of, for example, polypropylene resin. Further, as shown in FIG.
Is provided with a small hole 12a for inserting a wire.
The hole 12a of the winding drum portion 12 is provided along one flange portion 13 in this example, and in this example, the winding drum portion 1 is provided.
2 has a rectangular shape in plan view having a long side L in the circumferential direction and a short side w in the axial direction. The spool winding welding wire is formed by winding a welding wire around such a spool 10 in multiple layers in a coil shape. The shaft portion 11 of the spool 10 is externally fitted to a spool shaft of a wire feeding device. It is designed to be mounted on a feeding device.

In such a spool winding welding wire, when the welding wire W is wound around the spool 10, it is necessary to stop the wire start end with respect to the spool 10. For this reason, conventionally, a spool winding welding wire having a wire starting end having a structure as shown in FIG. 11 has been proposed (Japanese Utility Model Laid-Open No. 57-11673). FIG. 11 is a diagram showing a wire starting end of a conventional spool winding welding wire, and FIG. 12 is an explanatory diagram of fastening of the wire starting end to the spool in the spool winding welding wire.

As shown in FIG. 11, at the point A1 near the wire tip C of the welding wire W, the angle α formed by the wire portions B1 and B2 at the wire starting end of the spool winding welding wire becomes an acute angle. Then, at the point A2, the wire portion B2 is bent substantially perpendicularly in the same direction as the bending direction of the point A1 so that the length L2 of the wire portion B2 is longer than the length L1 of the wire portion B1. The bent end of the wire is formed. Then, as shown in FIG. 12, the spool winding welding wire is such that the P-shaped wire starting end is inserted into a hole 12a provided in the winding body 12 of the spool 10, and the spool 10 is rotated in the direction of arrow R. When winding is started, the leading end C of the P-shaped wire start end is pressed against the inner peripheral surface of the winding drum section 12, whereby the wire start end is stopped on the spool 10. In this example, the short side w of the hole 12a of the winding body 12 is approximately the same as the wire diameter, and the long side L is long enough to allow the wire starting end formed by bending into a P shape to penetrate.

[0006]

However, in the conventional spool winding welding wire described above, when the welding wire is a flux-cored wire having a small rigidity and a poor flexibility compared to a solid wire, it is shown in FIG. When forming the P-shaped wire starting end, if the point A1 nearer to the wire tip is bent so that the angle α becomes an acute angle so that the tip of the wire can come into contact with the inner peripheral surface of the winding body, A1 The point A1 often breaks because the bending radius of the point is small. If the bending angle α at the point A1 is increased to approach 90 ° in order to prevent this breakage, at the start of winding the wire around the spool 10,
Alternatively, when the wire is unwound during welding and the remaining amount of wire is reduced, the bending point A1 is bent back by the tensile force applied to the P-shaped wire start end, and the wire start end comes out of the hole 12a of the winding body 12. It often happens. For this reason, the winding of the welding wire becomes impossible at the start of winding, and the welding wire is loosened due to loosening at the time of welding, and the welding wire and the wire that hang down from the spool 10 due to the loosening. There is a problem that an electric short circuit occurs with the feeding device and the welding arc is extinguished.

Accordingly, an object of the present invention is to provide a spool-wound welding wire in which a welding wire is wound in a coil shape on a spool, and even if the welding wire is a flux-cored wire, the welding wire is securely stopped without coming off the spool. It is an object of the present invention to provide a spool winding welding wire having a wire starting end having a structure which can be used.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is a spool winding welding wire in which a welding wire is wound around a spool in a coil shape. The wire start end formed inside the winding body through the wire insertion hole is a loop-shaped spool winding welding wire.

According to a second aspect of the present invention, in the spool winding welding wire according to the first aspect of the present invention, the welding wire is a flux-cored wire. According to a third aspect of the present invention, in the wire for spool winding welding according to the first or second aspect of the present invention, a bending radius of the loop is 3.5 mm or more.

[0010] In the spool winding welding wire according to the present invention, the wire starting end formed inside the winding body through a wire insertion hole provided in the winding body of the spool is bent and closed. When a tensile force is applied to this loop-shaped wire starting end, the entire wire starting end is squeezed to be held without breaking the loop shape. The starting end of the loop-shaped wire can be securely stopped with respect to the spool without falling out of the hole (FIG. 8).
To FIG. 10).

In the wire for spool winding welding according to the present invention, since the wire start end is formed in a loop as described above, unlike the conventional P-type wire start end, it is necessary to sharply bend at a small bending radius. Therefore, the present invention is applicable not only to a solid wire but also to a flux-cored wire as a welding wire.

In the wire for spool winding welding according to the present invention, the bending radius of the loop at the beginning of the loop-shaped wire is 3.5.
mm or more is preferable. Wire diameter φ1.2mm, φ1.4m
In the case of solid wires and flux cored wires for mild steel and 490 N / mm class ² high-strength steel with a small diameter of m and φ1.6 mm, if the bending radius of the loop is less than 3.5 mm, the loop will be broken and the loop cannot be formed. This is because there are times. In addition, with respect to the flux-cored wire, the loop bending radius is more preferably 5 mm or more from the viewpoint that the loop is formed more reliably in consideration of the variation in the quality of each wire.

[0013]

Embodiments of the present invention will be described below. FIG. 3 is an explanatory view of the configuration of a wire starting end forming and fastening device used for manufacturing a spool winding welding wire according to the present invention. 1 and 2 for the spool.
And the description is omitted.

In FIG. 3, reference numeral 21 denotes a spool mounting flange.
A pair of loop forming pins 23a, 2
3b, and a pin rotation shaft 2 having a circular cross section to which a driven gear 24 is fixed at an end opposite to the spool 10.
2 is rotatably supported. Reference numeral 25 denotes a motor with a reduction gear in which a drive gear 26 is fixed to a motor shaft. The drive gear 26 rotates by the operation of the motor 25 with the speed reducer, and the pin rotation shaft 22 is rotated through the driven gear 24 meshing with the gear 26, so that the pin rotation shaft 2
Loop-forming pins 23a, 2 with the axis of rotation 2 as the center of rotation.
3b rotates in a certain direction, thereby forming a loop-shaped wire start end WS as described later. After the formation of the loop-shaped wire start end WS,
When the welding wire W is wound around the spool 10, the spool 10 and the spool mounting flange 21 are integrally rotated, so that a motor 25 with a speed reducer, which is a hindrance, is mounted on a fixed base (not shown). 27 is used to move backward.

The pair of loop forming pins are located inside the winding drum 12 of the spool 10 and near the wire insertion hole 12a, and the axis of the winding drum 12 is substantially parallel to the axis of each pin. Position. As shown in FIG. 4, the pair of loop forming pins have a circular cross-sectional shape having a circular cross-section having a radius R1 around the point C ′ and have a columnar shape. A loop forming pin 23b having a semi-circular cross-sectional shape having a semicircular cross section having a radius R1
Is fixed to a circular end face of the pin rotation shaft 22 having a circular cross-sectional shape having a radius of 2 × R1.
That is, the pair of pins 23a and 23b of the present example is such that the distance between the center point C ′ of the cylindrical pin 23a and the center point C ″ of the semi-cylindrical pin 23b is 2 × in plan view.
R1, and the bisecting point of a straight line connecting the two center points C ′ and C ″ coincides with the center point C of the pin rotation shaft 22 which is the rotation center point of the pins 23a and 23b; Is fixed to the circular end surface of the pin rotating shaft 22 such that the circumferential surface of the semi-cylindrical pin 23b is located on the opposite side to the cylindrical pin 23a. The dimensions of the solid wire having a wire diameter of 1.2 to 1.6 mmφ, the flux-cored wire, and the wire insertion hole of the spool: the short side w is 4.0 mm, the long side L is 6.5 mm, and the bending radius of the loop. The dimension of R1 is 3.5 mm.

Next, the formation of the wire start end using such an apparatus will be described with reference to FIG. FIG. 5 is a diagram for explaining the formation of the wire start end portion in the spool winding wire according to the present invention, and is an explanatory diagram viewed from the direction of arrow A in FIG.

First, as shown in FIG. 5, the tip portion of the welding wire W is wound from the wire insertion hole 12a of the spool 10 mounted on the spool mounting flange 21 to the winding body portion 1.
2 is inserted inside, and the wire tip is set to the pins 23a and 23b while passing between the opposed loop forming pins 23a and 23b. Then, the pin rotation shaft 22 is rotated clockwise in the drawing by the motor 25 with a speed reducer, so that the loop forming pins 23a and 23b rotate clockwise about the center point C of the pin rotation shaft 22 as a rotation center, By performing at least ５ rotation (270 ° rotation) as shown in FIG. 5, a wire start end WS having a closed loop shape in plan view is formed. FIG. 5 shows the wire start end WS formed by rotating the pins 23a and 23b one rotation about the point C, FIG. 5 shows the wire start end WS formed by rotating 1.5 times, and FIG. , Respectively, are shown.

In the case of the rotation of the pin 3/4 in FIG. 5 and the rotation of the pin 1 in FIG. 5, the loop-shaped wire starting end WS has a tear drop shape (tear drop shape) in plan view. . In addition, in the case of the rotation of the pin 1.5 in FIG. 5 and the case of the rotation of two in FIG. 5, the loop-shaped wire starting end portion WS has a shape in which the tear drop shape and the race track shape (oval) are superimposed in plan view. Has made. Note that, when viewed from the side, the overlapping portions of the loop-shaped wire starting end portion WS shown in FIGS. 5 to 5 are in contact with each other or are separated from each other by about the wire diameter without contact.

Thus, the loop forming pin 23
A and 23b are rotated once, for example, to form a loop-shaped wire starting end WS as shown in FIG. Next, by operating the cylinder 27, the engagement between the driving gear 26 and the driven gear 24 of the pin rotation shaft 22 is released, and the motor 25 with the speed reducer is moved backward. Thereafter, the spool 10 and the pins 23a, 23 are kept in a state where the loop-shaped wire start end WS is not removed from the pair of pins 23a, 23b.
By integrally rotating the spool mounting flange 21 supporting the b, the loop-shaped wire starting end portion WS is not pressed against the inner peripheral surface of the winding drum portion 12 by the pulling force of the winding (see FIG. 6). Wire winding for winding the welding wire W around the spool 10 is performed. After the wire winding is completed, the spool 10 around which the welding wire W is wound is removed from the spool mounting flange 21 so that the loop-shaped wire start end WS is removed from the pins 23a and 23b. FIG. 6 shows a spool winding welding wire according to an example of the present invention, in which a loop-shaped wire starting end is formed by one rotation of a pin, and thereafter, the welding wire is wound in a plurality of layers. FIG. 7 is a view showing a spool winding welding wire according to an example of the present invention, in which a loop-shaped wire starting end is formed by rotating a pin 1.5 times, and then a plurality of layers of the welding wire are wound.

FIG. 8 shows a spool winding welding wire according to an embodiment of the present invention. The wire is unwound at the time of welding to reduce the remaining amount of wire, and a pulling force is applied to the beginning of the loop-shaped wire formed by 3/4 rotation of the pin. FIG. 9 is a diagram for explaining a state when the wire is actuated. Similarly, FIG. 9 shows a spool winding welding wire according to an embodiment of the present invention. It is a figure for demonstrating the state at the time of tensile force acting on the loop-shaped wire starting end part. Similarly, FIG. 10 shows a spool winding welding wire according to an example of the present invention, which is unwound during welding so that the remaining amount of the wire is reduced, and a pulling force is applied to the loop-shaped wire starting end formed by 1.5 pin rotation. It is a figure for explaining a state at the time of acting.

In the spool winding welding wire configured as described above, the welding wire W is pulled out at the time of welding to reduce the remaining amount of the wire, and the loop wire starting end W
When a tensile force is applied to S by a wire withdrawal, FIG.
As shown in FIG. 10, the loop-shaped wire starting end WS is
The loop-shaped wire starting end portion WS is held at a plurality of points of contact or linear contact with the inner peripheral surface of the winding drum section 12 of the spool 10 so that the entire loop-shaped wire starting end WS is narrowed. The loop-shaped wire starting end WS can be reliably stopped with respect to the spool 10 without falling off from the 12a.

The loop-shaped wire starting end WS is preferably formed by an integral number of rotations from the viewpoint of easy control of the rotation of the loop-forming pins 23a and 23b, but the pins 23a and 23 are rotated twice. It takes a long time, so that it is preferable to form one rotation. In this example, as the pair of loop forming pins, one having a cylindrical pin 23a having a predetermined loop bending radius and the other being a semi-cylindrical pin 23b having a predetermined loop bending radius is used. However, the present invention is not limited to this, and cylindrical pins or semi-cylindrical pins may be used at predetermined intervals.

[0023]

As described above, according to the wire for spool winding welding according to the present invention, since the wire starting end has a loop shape, the loop-shaped wire starting end is subjected to a tensile force. When this is done, the entire loop start end of the loop-shaped wire is squeezed so that the loop shape is maintained without breaking, so that it does not come off from the wire insertion hole of the spool, and The loop-shaped wire starting end can be reliably stopped. Therefore, unlike the conventional P-type wire starting end, it is not necessary to bend sharply with a small bending radius, and even if the welding wire is a flux-cored wire that is more likely to break than a solid wire, it does not break and forms a loop. The wire start end can be formed, and the loop-shaped wire start end can be securely stopped with respect to the spool.

[Brief description of the drawings]

FIG. 1 is a front view of a spool of a spool winding welding wire.

FIG. 2 is a plan view showing an example of a hole for inserting a wire provided in a winding drum portion of the spool shown in FIG.

FIG. 3 is a configuration explanatory view of a wire start end forming / fastening device used for manufacturing a spool winding welding wire of the present invention.

FIG. 4 is a diagram showing a pin rotation shaft and a pair of loop forming pins in FIG. 3;

FIG. 5 is a diagram for explaining formation of a wire start end portion with the spool winding welding wire of the present invention, and is an explanatory diagram viewed from the direction of arrow A in FIG. 3;

FIG. 6 is a view showing a spool winding welding wire according to an example of the present invention, in which a loop-shaped wire starting end is formed by one rotation of a pin, and thereafter, the welding wire is wound in a plurality of layers.

FIG. 7 is a view showing a spool winding welding wire according to an example of the present invention, in which a loop-shaped wire starting end is formed by rotating a pin 1.5 times, and then the welding wire is wound in a plurality of layers.

FIG. 8 is a spool winding welding wire according to an embodiment of the present invention, wherein the wire is unwound at the time of welding to reduce the remaining amount of the wire;
It is a figure for demonstrating the state when tensile force acts on the loop-shaped wire starting end part formed by pin 3/4 rotation.

FIG. 9 is a spool winding welding wire according to an embodiment of the present invention, which is unwound during welding to reduce the remaining wire amount;
It is a figure for demonstrating the state at the time of tensile force acting on the loop-shaped wire starting end part formed by one rotation of a pin.

FIG. 10 is a spool winding welding wire according to an example of the present invention, wherein the wire is unwound during welding so that the remaining amount of the wire is reduced, and a tensile force acts on a loop-shaped wire starting end formed by 1.5 turns of a pin. It is a figure for explaining a state at the time.

FIG. 11 is a view showing a wire starting end of a conventional spool winding welding wire.

FIG. 12 is an explanatory view of fastening a wire start end of the spool winding welding wire to the spool.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Spool 11 ... Shaft part 12 ... Winding trunk part 12a
... Wire insertion hole 13 ... Flange part 14 ... Radial connecting plate part 21 ... Spool mounting flange 22 ... Pin rotation shaft 23a, 23b ... Loop forming pin 24 ... Driving gear 25 ... Motor with reduction gear 26 ... Drive gear 27
... Cylinder W ... Welding wire WS ... Loop wire start end

Claims (3)

[Claims] 1. A spool winding welding wire in which a welding wire is wound on a spool in a coil shape, wherein a wire starting end formed inside a winding body portion through a wire insertion hole of a winding body portion of the spool. A wire for spool winding welding, wherein the wire has a loop shape. 2. The wire according to claim 1, wherein the welding wire is a flux-cored wire. 3. The wire for spool winding welding according to claim 1, wherein a bending radius of the loop is 3.5 mm or more.