JPH11342471A - Wire supply device in arc welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a wire of a welding auxiliary material at an optimum angle and position without disturbing the degree of freedom for moving an arc torch in arc welding. SOLUTION: V-groove pulleys 11, 13, and 15 equipped with a ball bearing part respectively are arranged at the position shown in figure, and a wire 7 is sandwiched and held between the pulleys. The pulley 13 is positioned a little outside from a straight line connecting the pulleys 11 and 15, and the sandwiched wire 7 is plastic-processed exceeding an elastic area a little so as to be bent at a curvature radius R. Therefore, the wire 7 is supplied at a low angle to a position where an arc 4 occurs to a workpiece material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire feeding device for arc welding, and more particularly to a wire feeding device for arc welding that can be arranged near an arc torch even in a narrow place.

[0002]

2. Description of the Related Art In arc welding, it is possible to perform welding using only a base material of an object to be welded. However, in order to increase strength and the like, an arc welding wire of the same type as a base material as a welding auxiliary material is used. May be used. As a material of the wire, for example, mild steel, stainless steel, aluminum and the like are widely used as standard products. The tip of the arc welding wire needs to be disposed directly below the torch for arc welding, and it is preferable that the tip of the wire be in contact with the base material of the workpiece at an angle of as small as possible.

Conventionally, when supplying a wire for arc welding, the wire has been supplied from obliquely above the arc torch through a wire guide or the like. Although this method is simple, in order to feed the wire at a given position and angle, the wire guide may need to be placed very close to the arc torch, in which case the free movement of the arc torch is required. It also hinders the degree. Alternatively, if the internal inclination of the wire guide is made steep in order to prevent the degree of freedom of the arc torch from being hindered, there occurs a problem that the frictional resistance of the feeding of the internal wire becomes too large and the feeding cannot be performed smoothly.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to make it possible to supply a wire as a welding aid in arc welding at an optimum angle and position without hindering the degree of freedom of movement of an arc torch. And

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention relates to a wire feeder for arc welding, wherein first pulleys are provided on substantially the same plane and each have a rolling bearing portion. , A second pulley, and a third pulley, and the same one side surface in the left-right direction with respect to the center of each of the first pulley and the third pulley of the three pulleys; A wire is attached and stretched between the other side of the pulley and the wire is stretched, and a contact position of the second pulley is provided so as to protrude from a straight line connecting a position where the wire is attached. The present invention proposes a wire feeder for arc welding, wherein the wire feeder is plastically processed and bends with a radius of curvature R beyond the elastic region.

[0006] Further, the support shafts of the first pulley and the third pulley are fixed to a first rigid body, and the support shaft of the second pulley is fixed to a second rigid body. It is proposed to adjust the mutual distance between the first rigid body and the second rigid body. With this configuration, the mutual distance between the straight line connecting the first pulley and the third pulley and the position of the second pulley can be easily adjusted and set.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIG. 1, an embodiment of a wire supply device in arc welding according to the present invention will be described. Reference numeral 1 denotes a plasma arc torch, which is supplied from a high-voltage power supply device and a high-pressure air supply device (not shown), and receives a workpiece 3 from the tip of the plasma arc torch 1.
, An arc 4 is generated. In order to place the arc 4 at a predetermined position, a torch holder 5 is attached to the plasma arc torch 1 and serves as a basis for fixing or moving. A base 17 is provided on the side of the plasma arc torch 1.
The base 17 is provided with components of the wire supply device 10. Wire supply device 10
Is composed of a wire 7 and a guide 9 for passing the wire 7,
Three V-groove pulleys 1 each with a built-in ball bearing
1, 13, and 15. The wire 7 is pushed from above the guide 9 by a constant feed driving force from a wire feeder (not shown).

FIG. 2 is a partially enlarged view of the wire supply device 10. The V-groove pulley 11, the V-groove pulley 13, and the V-groove pulley 15 are arranged at the positions shown in the drawing, and the three V-groove pulleys hold the wire 7 therebetween. The V-groove pulley 13
Positioned slightly inside the straight line connecting the groove pulley 11 and the V-groove pulley 15, the sandwiched wire 7 bends with a radius of curvature R0. Here, the wire 7 goes over the elastic region,
Since the plastic processing is performed, the wire 7 in the open portion beyond the V-groove pulley 15 is bent inward with a radius of curvature R slightly larger than the radius of curvature R0 including return of bending by so-called springback. To maintain.

In order to set the curvature radius R0 to a predetermined value,
It can be set by adjusting the dimensions a and b in FIG. In particular, the value of the dimension b is important, and three V
The radius of the contact position of the groove pulleys 11, 13, and 15 is r, the diameter of the wire 7 is d, and the bending condition of the wire is represented by the following equation.

B = 2r + d ...

When the condition of the formula is satisfied, the wire 7
Becomes linear. That is, the radius of curvature R0 is infinite.

B <2r + d ...

When the condition of the formula is satisfied, the wire 7
Bends with a radius of curvature R0. The smaller the dimension b, the smaller the value of the radius of curvature R0. Regarding the dimension a, under the bending condition of the wire 7 defined by the above equation, the smaller the dimension a, the smaller the value of the radius of curvature R0.

The wire 7 is pushed by a constant feed driving force from a wire feeder (not shown), and the three V-groove pulleys 11, 13, 1
5, when the bending force is applied, the feed of the wire 7 is reduced to some extent, but the three V-groove pulleys 11, 13, 1
No. 5 has no problem because the rotational friction force is reduced by the ball bearings. Regarding the values of the dimension a and the dimension b, a smaller value can reduce the radius of curvature R0. However, the value may be an obstacle to the feeding of the wire 7, so that the value should be selected to a moderate value. .

FIG. 3 is a diagram showing another example of the embodiment of the wire supply device in the arc welding according to the present invention. In FIG. 3, the same reference numerals as those in FIG. 1 correspond to the same components. In this embodiment, a base 17 is attached to the torch holder 5 via a harness 19. The shape of the base 17 is substantially along the contour of the torch holder 5, and the positional relationship with the torch holder 5 is set to an optimal positional relationship by the adjusting screw 20 on the harness 19. On this base 17, three V-groove pulleys whose mutual positions can be adjusted are mounted.

The mechanism for adjusting the mutual position of the three V-groove pulleys will be described. A slit 17c is provided from substantially the middle to the tip of the base 17, and the center 17d is set as a boundary toward the base of the base 17. A near beam 17a and a beam 17b extending parallel to the free end 17f are formed. Adjustment screws 17s and 17t for adjusting the interval between the beam 17a and the beam 17b are provided. The interval increases when rotating and pushing the adjustment screw 17s, and the interval decreases when rotating and pushing the adjustment screw 17t. Become.
The V-groove pulley 13 is attached to the beam 17a, and the V-groove pulleys 11 and 15 are attached to the beam 17b, and the wire 7 is sandwiched between these three V-groove pulleys.

The principle of the mechanism for adjusting the mutual position of the three V-groove pulleys is that the support shafts of the first pulley and the third pulley are fixed to a first rigid body, and the support shaft of the second pulley is a second support. The first rigid body and the second rigid body are fixed to each other and the distance between the first rigid body and the second rigid body is adjusted. Therefore, modifications can be made within the scope of this principle. For example, in FIG. 3, the beam 17a and the beam
7b can also be connected to the base 17. Further, at the middle point 17d, the beam 17a and the beam 17b can be movably connected by a hinge.

[0018]

Since the present invention has the above-described features, in the arc welding, the supply of the wire for the welding aid is performed without occupying the space at the tip of the arc torch. Can be performed, and supply to an optimum angle and position can be performed without hindering the degree of freedom of movement. Further, since the contact angle of the wire is almost zero, the molten wire material is built up at the shortest distance at the welding portion of the work to be welded, so that an improvement in finish quality can be expected.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a wire supply device in arc welding according to the present invention.

FIG. 2 is a partially enlarged view of a wire supply device in arc welding according to the present invention.

FIG. 3 is a diagram showing another example of the embodiment of the wire supply device in the arc welding according to the present invention.

[Explanation of symbols]

1: Plasma arc torch 3: Workpiece 5:
Torch holder 7… Wire 9… Guide 1
0: Wire supply device 11: Pulley 13: Pulley 1
5 ... Pulley 17 ... Base 19 ... Harness

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B21F 23/00 B21F 23/00 A

Claims (2)

[Claims] 1. A wire feeder for arc welding, comprising: a first pulley, a second pulley, and a third pulley which are disposed on substantially the same plane and each have a rolling bearing, The same one side surface in the left-right direction with respect to the center of each of the first pulley and the third pulley of the three pulleys;
A wire is mounted between the other side of the second pulley and stretched, and a contact position of the second pulley is provided so as to protrude from a straight line connecting the position where the wire is mounted, and The wire feeder for arc welding, wherein the wire thus formed is plastically worked beyond the elastic region and bends with a radius of curvature R. 2. The support of the first pulley and the third pulley is fixed to a first rigid body, and the support of the second pulley is fixed to a second rigid body. 2. The wire feeder for arc welding according to claim 1, further comprising means for adjusting a distance between the first rigid body and the second rigid body.