JP2000351073A - Method for regenerating contact tip for arc welding and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a guide hole for welding wire to a prescribed diameter and to execute the reuse of a contact tip for arc welding without needing the fastening of spring or the like, by applying plastic-working to the contact to for arc welding enlarging the diameter of the guide hole for welding wire caused by wearing and contracting the diameter of the guide hole for welding wire. SOLUTION: The contact tip 10 for arc welding is disposed in a space surrounded with plural split molds 30 in a regeneration device. The split molds 30 are pushed in the axial direction with a pushing mold 40 and the contact tip 10 for arc welding is pushed in the radial direction with the split molds 30 while sliding an outside surface 32 of the split molds 30 with a tapered surface 21 downward of a tapered mold 20. The diameter of the guide hole for welding wire is contracted and the contact tip 10 for arc welding can be reused. Only the portion corresponding to a current supplying part of the contact tip 10 for arc welding is pushed in the radial direction to contact the diameter of the guide hole for welding wire, and since the working energy is little, this method is desirable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for regenerating a contact tip for arc welding.

[0002]

2. Description of the Related Art A welding wire is supplied to a contact tip for arc welding, and the welding wire slides in a welding wire guide hole slightly larger in diameter than the welding wire, and the welding wire is supplied from the contact tip at the welding wire guide hole. Power is supplied to As shown in FIG. 4, when the welding wire guide hole 2 of the contact tip 1 for arc welding is used, the welding wire guide hole 2 is worn due to discharge or friction with the welding wire 3, and the diameter of the welding wire guide hole 2 increases, so that welding is performed. Inconveniences such as a power supply failure and a target position failure (position displacement in FIG. 4) due to a contact failure between the wire 3 and the welding wire guide hole 2 occur. In order to alleviate these problems, Japanese Patent Application Laid-Open No. 7-100653 discloses a method in which a vertical slit is formed at the tip of a chip body, and the vertical slit is tightened by a spring to plastically deform the chip portion where the vertical slit is formed. A contact tip in which a wire guide hole is reduced in a direction orthogonal to a line connecting a pair of vertical slits has been proposed.

[0003]

However, the conventional reduction of the welding wire guide hole by tightening the vertical slot can reduce the welding wire guide hole in the direction perpendicular to the line connecting the pair of vertical slits. Power supply failure due to poor contact between the welding wire and the welding wire guide hole in the direction parallel to the line connecting the pair of vertical slits because the welding wire guide hole does not shrink in the direction parallel to the line connecting the vertical slits. However, the target position defect cannot be solved. In addition, since the hole diameter is reduced by plastic deformation of the contact tip in the radial direction of the vertical slit, a spring is required to maintain the reduced hole diameter, and the hole diameter changes with the strength of the spring, so it is stable No, etc. An object of the present invention is to provide a method and an apparatus for regenerating a contact tip for arc welding that can reduce a welding wire guide hole in all radial directions and that does not require a spring or the like to maintain the reduced hole diameter. is there.

[0004]

The present invention to achieve the above object is as follows. (1) A method for regenerating an arc welding contact tip in which the diameter of the welding wire guide hole is reduced by applying plastic working to the arc welding contact tip in which the diameter of the welding wire guide hole is increased by use. (2) The arc welding contact tip according to (1), wherein only the portion corresponding to the power supply portion in the axial direction is pressed from the outer peripheral surface of the contact tip to reduce the diameter of the welding wire guide hole. Playback method. (3) A tapered type having a tapered surface inclined so as to protrude inward in the radial direction as it goes in the work pushing direction, and an arc to be regenerated, divided into a plurality in the circumferential direction and arranged inside the tapered type. An arc welding contact tip regenerating apparatus comprising: a split die having a contact surface with a workpiece made of a welding contact tip on an inner side; and a pressing die for pressing the split die in a pressing direction.

In the method (1) for regenerating the contact tip for arc welding, the diameter of the welding wire guide hole is reduced by plastic working so that the hole can be reused. The diameter is maintained, the hole diameter is stable, and no tightening by a spring or the like is required to maintain the hole diameter. Also, in the plastic working, the welding wire guide hole can be reduced in all radial directions by pressing the arc welding contact tip from all radial directions of the outer periphery. In the method of regenerating the contact tip for arc welding of the above (2), only the portion corresponding to the power supply portion in the arc welding contact tip is pressed from the outer peripheral surface of the contact tip, so that the contact tip is extended over the entire length thereof. Load required for plastic working compared to pressing from
Energy is small. In the reproducing device of the contact tip for arc welding of the above (3), the split die is moved in the radial direction by moving the split die in the axial direction along the tapered surface of the taper type, and the contact tip for arc welding is moved to the outer periphery. , And the welding wire guide holes are plastically deformed and reduced in all radial directions.

[0006]

FIG. 1 shows a method of regenerating a contact tip for arc welding according to an embodiment of the present invention.
1 shows an apparatus for regenerating a contact tip for arc welding according to an embodiment of the present invention.

First, an apparatus for regenerating a contact tip for arc welding according to an embodiment of the present invention will be described with reference to FIGS. The contact welding apparatus according to the embodiment of the present invention includes a taper die 20, a split die 30, and a push die 4.
0 is provided. The tapered mold 20 is an annular mold,
It is continuous in the circumferential direction. The tapered die 20 has a tapered surface 21 on its inner peripheral surface that is inclined so as to protrude inward in the radial direction as it goes in the pushing direction of the work (contact tip for arc welding) 10. The split mold 30 is disposed inside the tapered mold 20 and is divided into a plurality in the circumferential direction (6 in the illustrated example).
) And are radially scalable. There is a gap 33 between adjacent split dies, and when the split die 30 is reduced in the radial direction, the gap 33 is reduced. Split mold 30
Is a taper in which at least a part 31a of the inner side surface 31 is a contact surface with a workpiece made of the arc welding contact tip 10 to be regenerated, and an outer side surface 32 is slidably in contact with the tapered surface 21 of the tapered die 20. Surface. The pressing die 40 presses the split die 30 in the pressing direction. The pressing die 40 is pressed by, for example, an upper ram of a pressing device.

A contact surface 31 of the inner surface 31 of the split mold 30 which is made of the contact tip 10 for arc welding with a workpiece.
a may be in contact with the entire outer peripheral surface 12 of the contact tip 10, or may be a portion of the contact tip 10 corresponding to the power supply portion 13 in the axial direction (the welding wire guide hole 11).
) May contact only the outer peripheral surface. In order to limit the contact surface 31a of the split die 30 with the work to the outer peripheral surface of only the portion corresponding to the power supply portion 13 (the portion of the welding wire guide hole 11), the upper portion of the split die 30 corresponds to the power supply portion 13. A concave portion 34 may be provided from the vicinity of the upper end of the portion to the upper surface of the split mold 30, and the outer periphery of the contact chip 10 may not be pressed at the concave portion 34.

Next, a method for regenerating an arc welding contact tip according to an embodiment of the present invention which is carried out using the above-described arc welding contact tip regenerating apparatus (also an operation of the arc welding contact tip regenerating apparatus). Will be described with reference to FIGS.

The method for regenerating the contact tip for arc welding according to the embodiment of the present invention is based on the use of the welding wire guide hole 11 by use.
The method comprises a method of regenerating an arc welding contact tip that allows plastic working to be performed on the arc welding contact tip 10 having a larger diameter to reduce the diameter of the welding wire guide hole 11 and enable reuse. The load of the plastic working is applied from the outer periphery of the arc welding contact tip 10 to the entire radial direction and inward in the radial direction. Thereby, the welding wire guide hole 1
The diameter 1 is plastically processed to a predetermined diameter (a diameter before wear or a diameter almost equal to the diameter before wear).

More specifically, the method for regenerating a contact tip for arc welding according to the embodiment of the present invention is a method for regenerating a contact tip for arc welding in which the diameter of a welding wire guide hole 11 is increased by use. A step of arranging in a space surrounded by a plurality of split dies 30, and then processing the pressing die 40, and pressing the split die 30 in the axial direction with the pressing die 40, so that the outer surface 32 of the split die 30 becomes the tapered surface of the tapered die 20 The sliding die 21 is moved to the contact tip 10 for arc welding in the direction of approaching the contact tip 10 in the radial direction of the contact tip 10 while sliding at at least a part 3 of the inner surface 31 of the split die 30.
1a, the contact tip 10 for arc welding to be regenerated on the contact surface with the workpiece
0 in the entire radial direction toward the inside of the contact tip 10 in the radial direction, and the contact tip 10 is plastically deformed in the entire radial direction. Reducing the diameter before the wear by plastic working (the shape of the welding wire guide hole 11 after the reduction is circular) to enable reuse.

In the plastic working of the arc welding contact tip 10, a portion of the arc welding contact tip 10 corresponding to the power supply portion 13 in the contact tip axial direction (a portion corresponding to the welding wire guide hole 11 in the axial direction).
May be pressed from the outer peripheral surface of the contact tip 10 to reduce the diameter of the welding wire guide hole 11. Alternatively, the entire length of the contact tip 10 for arc welding may be pressed from the outer periphery.

Next, the operation of the method for regenerating the arc welding contact tip 10 will be described. In the method for regenerating the contact tip 10 for arc welding, the diameter of the welding wire guide hole 11 is reduced by plastic working so that the welding wire guide hole 11 can be reused. Therefore, the reduced hole diameter maintains its diameter even after processing (however, Except for the springback portion, the springback portion is minute and can be ignored, and the hole diameter is stable, so that tightening by a spring or the like is not required to maintain the hole diameter. Also, in plastic working, the welding wire guide hole can be reduced in all radial directions by pressing the contact tip for arc welding from all radial directions of the outer periphery (however, a diameter slightly larger than the welding wire diameter). The hole shape is circular. Therefore, the welding wire can be regenerated to a state before the wear, and no trouble is caused in the power supply, and the welding wire can be sent without sticking in the welding wire guide hole 11.

Further, when only the portion corresponding to the power supply portion 13 of the arc welding contact tip is pressed from the outer peripheral surface of the contact tip in the axial direction, the contact tip is pressed from the outer periphery over the entire length thereof.
The load required for the plastic working (the pressing load of the pressing die 40) and the energy are small.

[0015]

According to the method for regenerating a contact tip for arc welding according to the first aspect of the present invention, the diameter of the welding wire guide hole is reduced by plastic working so that the welding wire can be reused. The diameter is maintained and the hole diameter is stable, so that tightening with a spring or the like is not required to maintain the hole diameter. Also, in the plastic working, the welding wire guide hole can be reduced in all radial directions by pressing the arc welding contact tip from all radial directions of the outer periphery. According to the method for regenerating the contact tip for arc welding of claim 2, only the portion corresponding to the power supply portion in the arc welding contact tip is pressed from the outer peripheral surface of the contact tip. The load and energy required for the plastic working are smaller than when pressing from the outer periphery. According to the regeneration device of the contact tip for arc welding of claim 3, the split die is moved in the radial direction inward by moving the split die in the axial direction along the tapered surface of the taper type, and the contact tip for arc welding is formed. The welding wire guide hole is plastically deformed and reduced in all radial directions by pressing from all radial directions of the outer periphery.

[Brief description of the drawings]

FIG. 1 is a sectional view of an arc welding contact tip before and after application of a method for regenerating an arc welding contact tip according to an embodiment of the present invention.

FIG. 2 is a sectional view of an apparatus for regenerating a contact tip for arc welding according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the regeneration device of the contact tip for arc welding of FIG. 2;

FIG. 4 is a cross-sectional view showing a state in which a welding wire guide hole is worn and a welding wire is misaligned in a target position in a general arc welding contact tip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Contact tip for arc welding 11 Welding wire guide hole 12 Outer peripheral surface 13 Power supply part 20 Taper type 21 Tapered surface 30 Split type 31 Inner side surface 31a At least a part of inner side surface (contact surface with work) 32 Outer side surface 33 Gap 34 Recess 40 Push type

Continuation of the front page (72) Inventor Toshiharu Takagi 5-14 Midorigaoka, Toyota-shi, Aichi F-term (reference) in Daitoyo Seiki Co., Ltd. 4E001 LD20 LH03 MB01 MC01 4E087 CA31

Claims (3)

[Claims] 1. A method for regenerating a contact tip for arc welding, wherein the diameter of the welding wire guide hole is reduced by applying plastic working to the contact tip for arc welding whose diameter of the welding wire guide hole is increased by use. 2. The arc welding contact according to claim 1, wherein only a portion of the arc welding contact tip corresponding to the power supply portion is pressed from the outer peripheral surface of the contact tip to reduce the diameter of the welding wire guide hole. How to play chips. 3. A tapered type having a tapered surface inclined so as to protrude inward in the radial direction as it goes in the work pushing direction, and is divided into a plurality of pieces arranged in the circumferential direction and arranged inside the tapered type to reproduce. An apparatus for regenerating an arc welding contact tip, comprising: a split die having a contact surface with a workpiece made of a contact tip for arc welding inside, and a pressing die for pressing the split die in a pressing direction.