JP2509568B2 - How to pull out the welding wire - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for pulling out a welding wire that can be smoothly unwound from a winding body and supplied with a welding wire with less curving. .

[Prior Art] As a wire housing for welding, as shown in FIG. 9 and FIG.
A winding body S as shown in FIG. 10 which is a sectional view taken along the arrow II is generally used. That is, the winding body S of this type is obtained by winding a welding wire (hereinafter referred to as a wire) W around the body peripheral surface 1a of the winding frame 1 made of plastics, iron, fiber board, or the like. Is locked on the flange portion 1b of the bobbin 1 and the like, then the whole is covered with the moisture-proof material 3 and further housed in the corrugated cardboard 4 and the like, and is provided to the market. When pulling out the wire W from such a winding body S, after opening the packaging, as shown in FIG. 10 (however, the cross section of the cardboard is not shown), the shaft hole 1c is formed.
Is rotatably supported by penetrating through an arm (not shown) of a support stand, the winding end of the wire W is removed, the winding body S is rotated, and the winding body S is sequentially drawn from the outer peripheral side to a welding torch via a conduit tube or the like. Supply. Such a winding body S
In the above, since the wire W is forcibly wound around the winding body portion 1a, when the winding end is removed, the loop is widened by the springback force of the welding wire W and the winding state is loosened and is removed from the winding frame 1. Alternatively, the winding end (drawing end) may be entangled and entangled in the connecting wire. When the wire W is pulled out and supplied in the welding torch direction in such a state, a tightening force acts between the wires, and the wire cannot be fed during welding, causing a serious welding defect. In addition, the heavier the winding body S, the greater the inertial force, so even if the wire feeding is stopped, the winding body continues to rotate by inertia, and the winding state of the wire becomes loose during the drawing and the wire that should originally be on the upper layer side is It may dig into the lower layers or cause a kink. Further, when the tension at the time of winding is small, the start of pulling out of the draw-out wire or the biting into the lower layer becomes more conspicuous at the time of acceleration, and smooth feeding is hindered.

For this reason, the wire wound around the winding body is usually given a certain bend (this is generally called cast),
In particular, measures have been taken to suppress the spread of the loop and the looseness of the winding state by setting the cast diameter to be small.

[Problems to be Solved by the Invention] By the way, when supplying the wire from the welding torch to the welding point, it is necessary to supply the welding wire accurately and stably to the target point, and the accuracy of this target has good targetability. Is called. However, the cast diameter given to the conventional winding body is quite small as described above, and the winding position is shifted by the wire diameter (pitch) for each winding in order to wind the winding on the winding drum in an aligned manner. Therefore, a complicated bend accompanied by twisting is imparted to the wire, resulting in deterioration of targetability.

As a modification of the wire winding body, Japanese Patent Publication No. Sho 42-2049
There is a torsion pack type as shown in Fig. 3, but this is to store it so that it is dropped into the hollow winding barrel while twisting the wire, and it is impossible to perform aligned winding with the current technology. is there. That is, since the wire is wound at random, the welding wires cross each other and various miscellaneous bends are formed in the wire, but it is difficult to remove such bends. Yes, the target momentum is inevitable.

The present invention has been made in consideration of the above-mentioned circumstances, and welding capable of smoothly pulling out a wire from a winding body and smoothly supplying a welding wire having good targetability to a welding torch. The present invention provides a method for pulling out a wire for use.

[Means for Solving the Problems] In the present invention which has achieved the above object, a welding wire having a cast diameter larger than the winding diameter is wound into a hollow coil shape and the outer peripheral surface and both side surfaces are constrained. The winding body was rotatably supported together with the winding body holder around the air core of the winding body using the winding body holder, and was unwound from the inner circumference side of the winding body according to the winding order. The welding wire is spirally wound along the outer wall surface of the rod-shaped member protruding from the in-winding holder through the air core of the winding body, and the starting end of the wound welding wire is rod-shaped member. It is a method of pulling out the welding wire from the tip side of the.

As an example of the winding body in the present invention, there is shown one in which a frame member is attached so as to extend over the outer peripheral surface and both side surfaces thereof, and the whole is covered with a heat-shrinkable film except for the hollow portion.

[Operation] As described above, the reason why the targeting property deteriorates is that the wound wire is cast. Therefore, if it is possible to realize a method of winding without casting and pulling it out without trouble, most of the problems of target deterioration should be able to be solved fundamentally. However, in the conventional winding body in which the wire is wound from the outer peripheral side of the winding drum, the springback force of the wire becomes too strong unless the wire is small cast, and the winding state becomes loose during or during drawing. Various problems occurred, and it was often inconvenient for practical use. Therefore, as a result of various studies on the above problems, the present inventor breaks the conventional wisdom that the wire drawing point from the winding body is provided on the outer peripheral side, and at least if the wire is drawn from the inner peripheral side. Since the problems due to springback were solved all at once and conversely the springback force was effectively used, we got the idea that casting could be made larger than before, and further research was conducted to realize this idea. As a result, the present invention has been completed.

That is, since the springback force acts on the outer peripheral surface side as described above, it is necessary to strongly restrain it. Also, since the wire is wound and laminated in a certain width, it is necessary to maintain the laminated form on the side surface. The restraint of is also required. However, on the inner peripheral surface side, since the force in the direction of reducing the winding radius of the wire does not act, the stability of the wound state of the wire is not actually damaged even if there is no restraining force. Therefore, in the present invention, only the inner peripheral surface side is opened, which allows the wire to be pulled out from the inner peripheral surface side even if the outer peripheral surface and the side surface are constrained. The winding body used in the present invention requires a winding cylinder that supports the inner peripheral surface side of the winding start and regulates the winding inner diameter at the time of forming the winding, but a winding cylinder that can be disassembled or reduced in diameter is used. The winding body used in the present invention can be formed without any trouble as long as it is disassembled or reduced in diameter after the winding is completed and then extracted. The frame member for constraining the outer peripheral surface and the side surface is not particularly limited in terms of shape, but after the wire is wound around the disassembling winding cylinder, the frame member is wound before disassembling the winding cylinder. Since it is necessary to fit the outer peripheral surface and the side surface of the wire body, it is desirable that the frame member is composed of two or more constituent members. Such frame members may be capable of being connected to each other and integrated after they are fitted.

Further, it is preferable that the outer peripheral surface and the side surface of the winding body in which the frame member is fitted are closely covered with the winding body by a heat shrinkable film or styrene foam injection. That is, it is preferable to securely restrain the winding so that the winding does not collapse when the winding jig for forming the winding body is removed. For example, if the winding jig is restrained with a shrink film, it has a moisture-proof effect and can be shipped as a product. Two birds with one stone. It is desirable that the frame members are evenly arranged in the circumferential direction of the winding body, but the frame members do not necessarily have to be evenly distributed as long as the constraint force can be exerted.

By the way, regarding the target property, which is one of the most important required characteristics for the welding wire, it is effective to cast the wire as little as possible as described above. However, according to the present invention, since the winding body whose outer peripheral surface and side surface are constrained as described above is used, there is no fear of loosening of the winding state at the time of pulling out, and therefore the winding body is formed. It is not necessary to cast the wire and wind it. Rather, the larger the cast diameter of the wire, the greater the springback force to the outer peripheral surface. Therefore, in the winding body of the present invention that restrains the springback force, the winding state is more stably maintained.
Therefore, in forming the winding body used in the present invention,
By winding a welding wire having a cast diameter larger than the winding diameter, it is possible to satisfy the target property during welding. However, it is desirable to set the cast diameter to 1.3 times or more of the winding diameter when it is required to have particularly good targetability such as when using a welding robot.

When pulling out the wire from the welding wire winding body, the winding body is housed in a rotatable winding body holder, the wire is unwound from the winding start end (inner peripheral surface side), and the shaft on the side surface of the winding body It can be pulled out from the open end of the heart. However, when the wire feed-out position of the winding body is located on the side farther from the side surface of the winding side when viewed in the width direction of the winding body, the wire pull-out angle with the wire winding surface as the reference plane becomes large, and it is impossible to draw the wire. Occurs. Therefore, in the present invention, a wire winding drum (hereinafter abbreviated as a drum), which is a rod-shaped member protruding from the winding body holder, is passed through the hollow portion of the winding body to pass the wire fed out from the winding body. After being wound around the drum one or more times, the winding body is pulled out from the open side surface. As a result, the wire drawing angle can be reduced, and the wire can be smoothly drawn from the inner circumferential surface of the winding body. Further, as the wire is pulled out, the drum rotates and the winding body holder that is integral with the drum also rotates, so that the winding body holder rotates according to the wire withdrawing speed. The wire can be pulled out. In order to prevent the excessive amount of wire from being unwound from the winding body due to inertial force, it is desirable to apply a braking torque or the like to the winding body holder as in the conventional method. The peripheral speed differs due to the difference in the inner diameter of the wire, and the wire is normally supplied to the drum excessively, but again, the springback force of the wire weakens the tightening force on the drum and an appropriate rotational force is automatically obtained. Has been confirmed. Therefore, it is almost unnecessary to apply the braking torque. The arrangement posture of the winding body holder is not limited, and the winding body holder can be applied to any of the horizontal direction, the vertical direction, and the oblique direction.

[Embodiment] FIG. 1 is an explanatory flow diagram showing a method for manufacturing a winding body used in the present invention.

In manufacturing the winding body, first, the wire W with less casting is attached to the winding frame 2 assembled by inserting the shaft center 7 made of a bolt and nut into the two flanged side plates 6 and the winding drum 2b. Wind as shown in Fig. 2 (side view of Fig. 1 (a)). The U-shaped frame member 8 (see FIG. 3) is fitted in four circumferentially evenly over the outer peripheral surface and both side surfaces of the wire W wound in this manner. As a result, the outer peripheral surface and the side surface of the wire W are constrained. Next, the winding frame 2 is disassembled to obtain the winding body S. FIG. 3 shows the appearance of the winding body S.

The winding body S thus obtained is then covered with a heat-shrinkable film F, and then heated to be brought into close contact with the winding body S, and further, the heat shrinkage of the inner circumferential surface of the winding body corresponding to the wire drawing portion. Cut off the film Fa (preferably pre-perforated to facilitate cutting),
The label L is attached so as to cover the excised portion (see FIG. 4).

As will be understood from the manufacturing process, the structure of the winding body S is such that only the outer peripheral surface and the side surface of the winding body S, in which the wires W which are not cast are wound in an outer winding manner, are arranged on the frame member 8 and the heat generating member. Since the wire is restrained by the shrink film F and the spring back force of the wire acting toward the outer peripheral side is restrained by the frame member 8 and the heat shrink film F, the shape of the winding body S is maintained. On the other hand, since the inner peripheral surface side is not restrained at all, the wire can be pulled out from the inner peripheral surface side without any trouble by the pulling-out method described later. If the cutout diameter of the heat-shrinkable film Fa is smaller than the inner diameter of the winding body, the heat-shrinkable film Fa
The inner edge slides in contact with the wire to act as a brake, suppressing the runout of the wire and stabilizing the drawn state. Furthermore, since the winding body used in this embodiment is covered with the heat-shrinkable film and the label, the winding body is shielded from the outside air, and the rustproof property can be secured for a long time. If the inner surface of the winding is covered with paper or a plastic film from the inside before the label is attached, the rust prevention effect is more reliably exhibited.

FIG. 5 (A) is a front sectional view showing another embodiment of the winding body, and FIG. 5 (B) is a side view thereof. In both figures, the heat-shrinkable film, the label and the like are indicated by broken lines. The frame members are arranged at equal intervals in the circumferential direction of the winding body S 3
One outer peripheral surface regulating plate material 8a and a pair of triangular frame bodies 8b arranged on both side surfaces are connected by a pin P, a number wire, etc.
On the other hand, by attaching the plate material 8a and the triangular frame 8b, the outer peripheral surface and both side surfaces of the winding body S are constrained.

Next, a wire drawing method of the present invention using the above winding body will be described.

FIG. 6 (A) shows a winding body holder H of a vertical type and a winding body S.
FIG. 6B is an axial cross-sectional explanatory view showing a method of housing and pulling out the wire, and FIG. 6B is a cross-sectional view taken along the line BB of FIG. 6A. The winding body holder H includes a bowl-shaped member 10 and a tubular drum 11 as a bar-shaped member which is provided so as to project from the center of the bowl-shaped member 10 and whose outer peripheral surface is tapered to facilitate the wire feeding. The tubular drum 11 is mainly configured with a brim 11a for preventing the wire from coming off. The tubular drum 11 is rotatably supported by a shaft J which is erected from the support plate T via a bearing, and accommodates the winding body S in a recess formed by the bowl-shaped member 10 and the tubular drum 11. Is able to. Before accommodating the winding body S, the label L is peeled off to form a hollow portion in the winding body S so that the tubular drum 11 can be penetrated.

Then, after unlocking the wire starting end on the inner peripheral surface side of the winding body S, the drawn wire starting end is spirally wound around the outer wall of the tubular drum 11 once, and then guided to the distal end side of the tubular drum 11, It is pulled in the direction and supplied to a conduit tube and a welding torch (not shown). With such a configuration, the tubular drum
The wire W wound around the tubular drum 11 is pulled out by the pulling force.
The wire holder W integrally rotated with the tubular drum 11 is rotated, and the wire W is smoothly fed out. In the present embodiment, even if there is some variation in the wire pulling speed from the welding torch side, the rotation of the tubular drum 11 absorbs this and the wire supply stability is sufficiently ensured. That is, when the wire drawing speed from the torch side becomes slightly faster, the winding force of the wire with respect to the tubular drum becomes stronger, and the drawing speed is transmitted as it is, so the tubular drum 11 rotates at a slightly increased speed, As a result, the wire is supplied without fail. On the contrary, when the wire drawing speed from the torch side becomes slightly slower, the winding force of the wire with respect to the tubular drum becomes weak and the contact between the wire and the tubular drum becomes slightly floating, so that the transferability of the drawing force is reduced. As a result, the winding holder H
Becomes idle, and the slack in the wire between the inner circumferential surface of the winding body S and the tubular drum 11 slightly increases, thereby absorbing the speed change. That is, the winding body holder H can exhibit a function of adjusting the wire feeding amount from the winding body S.

FIG. 7 shows a case where the winding body S is housed in the horizontal winding type wire holder H and the wire is drawn out. The operation is similar to the operation described in FIG.

In addition, in the above-mentioned drawing method, the wire is tubular drum.
Since it is wound around 11, there is a possibility that some curl will occur at this time. In order to reduce this, it is desirable that the outer diameter of the tubular drum 11 be as large as possible within the range in which it does not contact the inner circumferential surface of the winding body S.

Further, if the wire is wound around the tubular drum 11 many times, the wire may be entangled on the tubular drum 11. Therefore, it is desirable that the wire be wound a few times. Although it depends on the rigidity of the wire (it can be more than once for a highly rigid wire), it is recommended that the number of windings is once.
That is, for a wire having high rigidity, the higher the tension in drawing out, the better, and the larger the wire diameter, the more effective. Therefore, the present invention is not suitable for a metal wire having low rigidity.

Next, description will be made on the results of the investigation of the wire supply property and target property when various values of (cast diameter / winding diameter) are changed in the above wire drawing method.

FIG. 8 is a graph showing the relationship between the value of (cast diameter / winding diameter) and the occurrence of wire feeding failure for each of the wires having tensile strengths of 50, 100 and 150 Kg / mm ² . In addition,
The wire was pulled out using a horizontal type winding body holder.

As shown in the figure, the value of (cast diameter / roll diameter) is 1.
In the case of 0 or less, the spring back force to the outer peripheral surface side was weakened due to excessive attachment of the cast, the wire alignment winding state was disturbed at the time of transportation, and the problem of wire feeding failure occurred. Therefore, the value of (cast diameter / roll diameter) should be more than 1.0 from the viewpoint of preventing feeding failure. Regarding the relationship between the feedability and the wire tensile strength, a wire having a larger tensile strength tends to cause less feeding failure. This is because a wire having a higher tensile strength has a stronger spring force and is easily separated. However, the tensile strength of the welding wire is designed to be 60 to 160 Kg / mm ² for low carbon steel solid wire and 40 to 100 Kg / mm ² for composite wire so that it does not buckle when it is fed in a conduit tube, etc. Since the above-mentioned experimental conditions cover almost all of these, if the value of (cast diameter / winding diameter) exceeds 1.0, defective wire feeding can be prevented. However, as the feeding route is longer, especially when the feeding capability is strict, the cast diameter is 1.1
It is desirable to double or more.

On the other hand, the targeting property of the welding wire is better as the cast diameter of the welding wire is larger, that is, as close to the linear shape as possible, and it is substantially impossible to completely eliminate the bending to form the winding body. However, it is desirable that the cast diameter of the wire to be wound is 1.0 times or more the winding diameter at least when forming the winding body. However, when using a welding robot, it is desirable to set the cast diameter to 1.3 times the winding diameter or more, especially when good targetability is required.

As described above (cast diameter / winding diameter), if high performance is not required in terms of feedability and targetability, it is over 1.0 from the viewpoint of wire feedability and also from the viewpoint of targetability.
It should be more than 1.0, and in the end, it is necessary to be more than 1.0 in order to provide a winding body having excellent targeting property and wire feeding property.

EFFECT OF THE INVENTION According to the present invention, the welding wire is fed out from the inner peripheral surface side while the outer peripheral surface and the side surface of the winding body are constrained by the frame member,
Since the wire is pulled out after being wound on a rod-shaped member, when pulling out the welding wire from the winding body, a welding wire with a cast diameter larger than the winding diameter is drawn without causing wire feeding defects such as fraying. Therefore, it is possible to supply a welding wire having good targetability.

[Brief description of drawings]

FIG. 1 is a flow explanatory view showing a method of manufacturing a winding body used in the present invention, FIG. 2 is a sectional view taken along the line II in FIG. 1 (a), and FIG. 3 is FIG. 1 (c). FIG. 4 is an external perspective view of the winding body shown in FIG. 4, FIG. 4 is an external perspective view of the product winding body, FIG. 5 is a longitudinal sectional view and a side view showing another configuration of the winding body, and 6 is the wire of the present invention. A longitudinal sectional view of an apparatus used for a drawing method and B-
FIG. 7 is a cross-sectional view taken along the arrow B, FIG. 7 is an explanatory view showing a method for pulling out a wire by a lateral position, and has a notch, and FIG. 8 is a graph showing a relationship between (cast diameter / winding diameter) and a defective feeding occurrence rate. 9 is a vertical sectional view showing the structure of a conventional winding body, and FIG. 10 is a sectional view taken along the line II-II in FIG. 2 ... Winding cylinder 8 ... Frame member 8a, 8b ... Frame member 11 ... Drum (rod-shaped member) F ... Heat-shrinkable film H ... Winding body holder S ... Winding body W ... Welding For wire

Claims (2)

(57) [Claims] 1. A hollow winding body formed by winding a welding wire having a cast diameter larger than the winding diameter in a hollow coil shape and constraining the outer peripheral surface and both side surfaces thereof by using a winding body holder. The welding wire, which is rotatably supported around the air core of the winding body together with the winding body holder and is unwound from the inner peripheral side of the winding body in accordance with the winding order, is A spiral winding is performed along the outer wall surface of the rod-shaped member protruding from the winding body holder through the core, and the starting end of the wound welding wire is pulled out from the tip side of the rod-shaped member. Characteristic welding wire drawing method. 2. The winding body has a frame member mounted so as to extend over the outer peripheral surface and both side surfaces thereof, and is entirely covered with a heat-shrinkable film except for the hollow portion. The withdrawal method according to claim 1.