JP5317266B2 - Chip holder, manufacturing method thereof, and consumable electrode gas shield arc welding torch - Google Patents

Description

  The present invention relates to a tip holder for a consumable electrode gas shielded arc welding torch (hereinafter referred to as a welding torch), a manufacturing method thereof, and a welding torch.

  Today, in order to improve the work efficiency of welding, it is widely performed to automate welding using a welding robot. In this case, the welding torch is attached to the wrist of the manipulator of the articulated robot, the welding wire wound around the wire reel is fed to the welding torch, and electric power and shield gas are supplied to the welding torch for welding. .

  Since the welding wire fed to the welding torch is usually wound around a wire reel, the welding wire is bent. Since the bending curve of the welding wire is not constant, it is difficult to match the tip position of the welding wire sent from the power feed tip attached to the tip of the welding torch to the desired welding target position.

  In addition, power is supplied to the welding wire when the welding wire comes into internal contact with the power supply tip attached to the tip of the welding torch. If the bending of the welding wire is not constant, the contact point between the welding wire and the power supply tip Is not constant. As a result, the protruding length of the welding wire that is the length from the contact point between the welding wire and the power feed tip to the tip of the welding wire varies. Due to this variation, the resistance heat generation of the protruding length portion of the welding wire varies, and the amount of melting of the welding wire varies. As a result, the arc length varies and a uniform weld bead cannot be formed.

  In order to solve the above-described problems, the following welding torch has been proposed. FIG. 4 is a cross-sectional view of the welding torch. In the figure, a tip body 3 composed of a first tip body 3a and a second tip body 3b is attached to the tip of the torch body 2 of the welding torch 1 in the wire feeding direction. The chip holder 4 is attached to the part. An insulating member 5 is provided at the tip of the chip holder 4. These torch body 2, chip body 3, chip holder 4, and insulating member 5 have wire insertion holes formed in the shaft core portion. Further, the insulating member 5 described above prevents feeding of power to the welding wire when the welding wire comes into contact with the wire insertion hole of the chip holder 4.

  A torch spring 6 is provided inside the tip body 3, and a base end portion of the torch spring 6 is in contact with a distal end portion of the torch body 2. The pressure shaft 7 is provided inside the tip body 3, and the proximal end portion of the pressure shaft 7 is in contact with the distal end portion of the torch spring 6. The torch spring 6 and the pressure shaft 7 have a wire insertion hole formed in the shaft core portion.

  The power feed tip 8 has a wire insertion hole formed in the shaft core portion, the proximal end portion of the power feed tip 8 is inserted into the tip end portion of the tip body 3, and is in contact with the tip end portion of the pressure shaft 7. The tip of the power feed tip 8 is inserted into the tip holder 4. That is, the power feed tip 8 is pressed by the pressure shaft 7 and the tip holder 4. Further, the power supply chip 8 is formed with a vertical slit 9 extending from the tip portion along the wire insertion hole.

  Further, a taper shape 10 is formed on the side surface of the power feed tip 8 so as to come into contact with the proximal end portion of the tip holder 4. For this reason, since the vertical slit 9 is formed as described above, when the tip of the power feed tip 8 is inserted into the chip holder 4 and the power feed tip 8 is pressed by the pressure shaft 7 and the chip holder 4. The tip of the wire insertion hole 9 of the power feed tip 8 is reduced in diameter, and the inner surface of the wire insertion hole can press the welding wire.

  An orifice 11 is provided below the first tip body 3 a, and a nozzle 12 surrounds the tip holder 4 and the orifice 11. Shielding gas is ejected through the ejection hole of the orifice 11, and this shielding gas shields the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere. An insulating bush 13 is provided around the first chip body 3a. (For example, refer to Patent Document 1).

  5A and 5B are diagrams showing a conventional chip holder, where FIG. 5A is a cross-sectional view, and FIG. 5B is an exploded cross-sectional view. In FIG. 5, the tip holder 4 is a cylindrical shape made of a soft conductive metal, is formed hollow so that the above-described feeding tip 8 is inserted from the base end portion, and a wire insertion hole is formed in the shaft core. Is formed. The insulating member 5 provided at the tip portion of the chip holder 4 has heat resistance, a wire insertion hole is formed in the shaft core, and a step portion that is locked to the tip portion of the chip holder 4 is formed on the outer peripheral surface. ing.

  This insulating member 5 is inserted from the base end portion of the chip holder 4 and is locked to the tip end portion of the chip holder 4, and a C-shaped spring 14 made of a soft metal is applied with pressure from the base end portion of the chip holder 4. Then, it is moved to the tip end portion of the chip holder 4 and pressed against the proximal end portion of the insulating member 5 to prevent the insulating member 5 from being pulled out and fixed.

International Publication No. WO2008 / 018594A1 Pamphlet

  In the conventional tip holder 4 described above, in order to fix the insulating member 5 to the distal end portion, it is necessary to insert the C-shaped spring 14 from the proximal end portion of the tip holder 4 and apply pressure to the distal end portion. In this case, since the inner diameter of the chip holder 4 is small, the C-shaped spring 14 is small, and there is a distance from the proximal end portion to the distal end portion of the chip holder 4, the C-shaped spring 14 is pressed to the distal end portion of the chip holder 4. It takes man-hours to add and push. Further, when welding is performed for a long time, the tip holder 4 and the C-shaped spring 14 repeat expansion and contraction, so that the C-shaped spring 14 is detached from the tip holder 4 and the insulating member 5 is removed from the tip holder 4. It may fall out.

  In order to solve this problem, for example, an annular stopper member is formed instead of the C-shaped spring 14, a male screw portion is formed around this, and a female screw portion is further formed on the inner surface of the chip holder to fix the stopper member. A structure to be inserted into a chip holder has been proposed. However, in this structure, it is necessary to increase the thickness of the stopper member in order to form the male screw portion, resulting in an increase in size. Furthermore, it is necessary to form an internal thread portion on the inner surface of the chip holder, which significantly increases the number of manufacturing steps.

  An object of the present invention is to provide a chip holder in which an insulating member does not fall off from the chip holder and a manufacturing method thereof.

The first invention is
Chip body,
A chip holder attached to the tip of the chip body;
A power feed tip provided between the tip portion of the tip body and the tip holder, and formed with a vertical slit extending from the tip portion along the wire insertion hole;
In the tip holder used in a consumable electrode gas shield arc welding torch in which the feeding tip is pressed against the tip holder and the wire insertion hole of the feeding tip is reduced in diameter to feed the welding wire,
The tip holder has a cylindrical shape having conductivity, and is formed hollow so that the feeding tip is inserted from the base end portion, and a wire insertion hole is formed in the shaft core,
An insulating member insertion hole is formed at the tip of the chip holder, a wire insertion hole is formed in the shaft core, and an insulating member having heat resistance is inserted into the insulating member insertion hole,
A protective annular member is provided between the insulating member and the insulating member insertion hole,
The tip holder is characterized in that a distal end portion of the insulating member insertion hole is pressed inward to fix the insulating member in the insulating member insertion hole.

The second invention is
A consumable electrode gas shielded arc welding torch, comprising the chip holder according to the first inventions.

The third invention is
Chip body,
A chip holder attached to the tip of the chip body;
A power feed tip provided between the tip portion of the tip body and the tip holder, and formed with a vertical slit extending from the tip portion along the wire insertion hole;
In the method of manufacturing a tip holder used in a consumable electrode gas shield arc welding torch in which the power feed tip is pressed against the tip holder and the wire insertion hole of the power feed tip is reduced in diameter to feed power to a welding wire.
The tip holder is formed in a cylindrical shape having conductivity, and is formed so as to be hollow so that the feeding tip is inserted from the base end portion, and a wire insertion hole is formed in the shaft core,
An insulating member insertion hole is formed at the tip portion of the chip holder, and a wire insertion hole is formed in the shaft core and a heat-resistant insulating member is inserted into the insulating member insertion hole, and then the insulating member and the insulating member are inserted. An annular member for protection is provided between the insertion hole for members and the tip of the insertion hole for insulation member is pressed inward by a rotating die to fix the insulation member in the insertion hole for insulation member. This is a method for manufacturing a chip holder.

  Even if the chip holder repeatedly expands and contracts by welding for a long time, there is no problem that the insulating member falls off the chip holder.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. 1A and 1B are views showing a chip holder of the present invention, where FIG. 1A is a cross-sectional view and FIG. 1B is an exploded cross-sectional view. In FIG. 1, a tip holder 21 is made of a soft conductive metal having a cylindrical shape, and is formed hollow so that the power feed tip 8 shown in FIG. 4 is inserted from the base end portion, and a wire insertion hole is formed in the shaft core. 22 is formed. A male screw part 23 is formed on the outer peripheral surface of the base end part of the chip holder 21 and is screwed into a female screw part formed at the tip part of the chip body 3b.

  In addition, an insulating member insertion hole 25 for inserting the insulating member 24 is formed at the distal end portion of the chip holder 21, and the base end portion of the insulating member 24 comes into contact with the insulating member insertion hole 25. A stop 26 is formed. The insulating member 24 has heat resistance because a wire insertion hole is formed in the shaft core. A step 24 a for locking the protective annular member 27 is formed on the outer peripheral surface of the insulating member 24. The insulating member 24 is inserted into the insulating member insertion hole 25, the distal end portion of the insulating member insertion hole 25 is pressed inward by a rotary die described later with reference to FIG. 2, and the insulating member 24 is inserted into the insulating member insertion hole 25. It is fixed inside. A protrusion 28 is formed at the tip of the insulating member insertion hole 25 so as to protrude from the tip of the insulating member 24 when the insulating member 24 is inserted. The protrusions 28 are formed so as to easily fix the insulating member 24 by forming a flange portion when the distal end portion of the insulating member insertion hole 25 is pressed inward by a rotating die.

  The protective annular member 27 is made of a soft metal, and is locked to the step 24a of the insulating member in order to prevent the insulating member 24 from rattling in the insulating member insertion hole 25. Further, the protective annular member 27 prevents the insulating member 24 from cracking when the protrusion 28 of the insulating member insertion hole is pressed inward by the rotating die and the pressing force is too strong. .

  If the insulating member insertion hole 25 and the insulating member 24 have high accuracy in shape, the processing accuracy of the rotary die is high, and the insulating member 24 does not break, it is necessary to provide the protective annular member 27. No. Further, when the protective annular member 27 is not provided, instead of forming the projection 28 of the insulating member insertion hole, the distal end of the insulating member insertion hole is pressed inward, and the distal end is pressed against the insulating member. You may contact | abut to this step part 24a.

  Next, a manufacturing method of the chip holder will be described with reference to FIGS. FIG. 2 (A) is a partial cross-sectional view for explaining the method for manufacturing the chip holder of the present invention, showing a state before the rotary die is pressed against the chip holder, and FIG. It is an expanded sectional view of the tip part. FIG. 3 is a partial cross-sectional view showing a state in which the rotary die is pressed against the chip holder, and FIG. 3B is an enlarged cross-sectional view of the tip portion of the chip holder. In FIG. 2, first, the base end portion of the chip holder 21 is fixed to the chuck 29, the insulating member 24 is inserted into the insulating member insertion hole 25 of the chip holder, and the protective annular member 27 is connected to the step 24a of the insulating member. To lock. For example, a recess 30 a corresponding to the final shape of the tip portion of the chip holder 21 is formed in the rotary die 30 of the electric rotary tool, and the rotary die 30 is provided coaxially with the central axis 32 of the chuck 29.

  Then, as shown in FIG. 3, while rotating the rotary die 30, the rotary die 30 is moved downward along the central axis 32 and pressed against the protrusion 28 at the tip of the chip holder. As a result, the protrusion 28 of the chip holder undergoes plastic deformation along the shape of the recess 30 a of the rotary die to form the flange 31, and the tip of the flange 31 abuts against the insulating member 24. For this reason, the insulating member 24 is fixed in the insulating member insertion hole 25 and is prevented from coming off.

  As a result, even if the chip holder 21 repeatedly expands and contracts by performing welding for a long time, there is no problem that the insulating member 24 falls off the chip holder 21. Further, the number of manufacturing steps can be reduced as compared with the prior art without increasing the size of the parts.

It is a figure which shows the chip | tip holder of this invention. It is a manufacturing method of the chip holder of the present invention. It is a manufacturing method of the chip holder of the present invention. It is sectional drawing of a welding torch. It is a figure which shows the conventional chip holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Welding torch 2 Torch body 3 Tip body 3a 1st tip body 3b 2nd tip body 4 Tip holder 5 Insulating member 6 Torch spring 7 Pressure shaft 8 Feeding tip 9 Wire insertion hole 10 Taper shape 11 Orifice 12 Nozzle 13 Insulating bush 14 C-shaped spring 21 Tip holder 22 Wire insertion hole 23 Screw part 24 Insulating member 24a Step part 25 Insulating member insertion hole 26 Locking part 27 Protective annular member 28 Projection part 29 Chuck 30 Rotating die 30a Concave part 31 Flange part 32 Central axis

Claims (3)

Chip body,
A chip holder attached to the tip of the chip body;
A power feed tip provided between the tip portion of the tip body and the tip holder, and formed with a vertical slit extending from the tip portion along the wire insertion hole;
In the tip holder used in a consumable electrode gas shield arc welding torch in which the feeding tip is pressed against the tip holder and the wire insertion hole of the feeding tip is reduced in diameter to feed the welding wire,
The tip holder has a cylindrical shape having conductivity, and is formed hollow so that the feeding tip is inserted from the base end portion, and a wire insertion hole is formed in the shaft core,
An insulating member insertion hole is formed at the tip of the chip holder, a wire insertion hole is formed in the shaft core, and an insulating member having heat resistance is inserted into the insulating member insertion hole,
A protective annular member is provided between the insulating member and the insulating member insertion hole,
A tip holder, wherein a distal end portion of the insulating member insertion hole is pressed inward to fix the insulating member in the insulating member insertion hole. A consumable electrode gas shielded arc welding torch comprising the tip holder according to claim 1. Chip body,
A chip holder attached to the tip of the chip body;
A power feed tip provided between the tip portion of the tip body and the tip holder, and formed with a vertical slit extending from the tip portion along the wire insertion hole;
In the method of manufacturing a tip holder used in a consumable electrode gas shield arc welding torch in which the power feed tip is pressed against the tip holder and the wire insertion hole of the power feed tip is reduced in diameter to feed power to a welding wire.
The tip holder is formed in a cylindrical shape having conductivity, and is formed so as to be hollow so that the feeding tip is inserted from the base end portion, and a wire insertion hole is formed in the shaft core,
An insulating member insertion hole is formed at the tip of the chip holder, a wire insertion hole is formed in the shaft core, and an insulating member having heat resistance is inserted into the insulating member insertion hole,
After providing a protective annular member between the insulating member and the insulating member insertion hole, the distal end portion of the insulating member insertion hole is pressed inward by a rotating die, and the insulating member is moved to the insulating member. A method of manufacturing a chip holder, wherein the chip holder is fixed in the insertion hole.

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