JP5090768B2 - Consumable electrode gas shield arc welding torch and power supply tip - Google Patents

Description

  The present invention relates to a consumable electrode gas shield arc welding torch (hereinafter referred to as a welding torch) attached to the wrist of an arc welding robot.

  Conventionally, it has been widely practiced to automate welding using an arc welding robot. FIG. 5 is a diagram showing a general configuration of an arc welding robot. In the figure, a welding torch 3 is attached to the tip of the wrist 2 of the manipulator 1, and a welding wire 5 wound around a wire reel 4 is fed to the welding torch 3 by a wire feeding device 6 attached to the manipulator 1. Is done. Further, electric power is supplied from the welding power source 7 to the welding torch 3, and shield gas is supplied from the gas cylinder 8 to the welding torch 3. A command signal is input from the teach pendant 9 to the robot controller 10, and a signal from the robot controller 10 is input to the manipulator 1 to rotate the six axes including the first axis to the sixth axis, thereby welding the torch. 3 tip position is controlled.

  As the welding torch 3 conventionally used attached to the wrist 2 of the manipulator 1, the one shown in FIG. 6 is often used (see, for example, Patent Document 1). This figure is a sectional view of a welding torch 3 of the prior art. In the figure, a tip body 13 is attached to a torch body 12, and a power feed tip 14 is screwed to a tip portion 13 a of the tip body 13. These torch body 12, tip body 13, and power feed tip 14 are formed with wire insertion holes in the shaft core portion. Electric power is supplied to the welding wire 5 by the welding wire 5 being inserted through these wire insertion holes and making internal contact with the power feed tip 14. The orifice 17 is provided below the tip body 13, and the nozzle 16 surrounds the power feed tip 14 and the orifice 17. The shield gas is ejected through an ejection hole 17a provided in the orifice 17, and this shield gas shields the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere. An insulating bush 18 is provided around the chip body 13.

  By having the structure described above, the electric power supplied to the torch body 12 is supplied to the power supply tip 14 via the tip body 13 during arc welding. Further, a shielding gas is ejected to shield the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere.

JP 2002-346748 A

  The arc heat generated during arc welding is said to be several thousand degrees to tens of thousands degrees. Due to this radiant heat, the tip of the power feed tip is exposed to a high temperature and rises from several hundred degrees to nearly one thousand degrees. The power supply chip generally uses a copper alloy. However, since the surface hardness decreases and softens as the temperature rises, there is a problem that it is easily worn and has a short life. The worn power supply tip will be replaced, but the replacement work must be performed manually by the operator after stopping the arc welding robot in operation, which is a factor that reduces productivity. It was. Further, since it is necessary to stock a large number of power supply chips for replacement, the production cost is also increased.

  An object of the present invention is to provide a welding torch capable of improving productivity and reducing production cost by extending the life of a power supply tip attached to the tip of the welding torch.

The first invention is
A torch body having a wire insertion hole in the shaft core, and
A chip body that is attached to the tip of the torch body and has a wire insertion hole in the shaft core, and a protrusion formed on the inner surface in the vicinity of the tip of the wire insertion hole;
A chip holder attached to the tip of the chip body and having a wire insertion hole in the shaft core; and
The base end portion is in contact with the protrusion of the chip body and a step portion is formed on the side surface where the base end portion of the chip holder contacts , and the chip does not have a screwing portion for attaching to the chip holder. A power supply chip having a wire insertion hole in the shaft core part, which is attached in a manner to be sandwiched between the protrusion part of the body and the base end part of the chip holder ,
The step of the power supply chip is formed so that a space is formed between the inner surface of the chip holder and the front end of the power supply chip when the front end of the power supply chip is inserted into the chip holder. A consumable electrode gas shielded arc welding torch.

  According to a second aspect of the present invention, a taper shape is formed on the side surface of the step portion of the power feed tip, and an inclined surface that is in contact with the taper shape is formed at a tip portion of the chip body. It is a consumable electrode gas shield arc welding torch.

  According to a third aspect of the present invention, a taper shape is formed at the base end portion of the power feed tip, and an inclined surface that contacts the taper shape of the base end portion of the power feed tip is formed at the protrusion portion of the chip body. The consumable electrode gas shielded arc welding torch according to the first or second invention.

  A fourth invention is the consumable electrode gas shielded arc welding torch according to any one of the first to third inventions, wherein the tip holder has heat resistance.

  5th invention embedded the heat-resistant member which has a wire insertion hole in the axial center part at the front-end | tip part of the said chip holder, The consumable electrode gas shield of any one of 1st-4th invention characterized by the above-mentioned. This is an arc welding torch.

  According to a sixth aspect of the present invention, in the power feeding chip according to any one of the first to fifth aspects, wherein one or a plurality of vertical slits extending from the distal end portion along the wire insertion hole are formed. The consumable electrode gas shielded arc welding torch described in 1 above.

  A seventh aspect of the present invention is the consumable electrode gas shielded arc welding torch according to the sixth aspect, wherein the tip of the power supply tip is press-processed in a direction in which the diameter decreases.

The eighth invention
A torch body having a wire insertion hole in the shaft core, and
A chip body that is attached to the tip of the torch body and has a wire insertion hole in the shaft core, and a protrusion formed on the inner surface in the vicinity of the tip of the wire insertion hole;
A power supply tip of a consumable electrode gas shield arc welding torch equipped with a tip holder attached to the tip portion of this tip body and having a wire insertion hole in the shaft core portion,
The power supply tip has a stepped portion whose base end abuts against the protrusion of the chip body and the base end of the tip holder abuts on a side surface , and has a screwing portion for attaching to the chip holder. It is attached in such a manner that it is sandwiched between the protruding part of the chip body and the base end part of the chip holder, and has a wire insertion hole in the shaft core part,
The step of the power supply chip is formed so that a space is formed between the inner surface of the chip holder and the front end of the power supply chip when the front end of the power supply chip is inserted into the chip holder. It is the electric power feeding chip characterized.

  According to a ninth aspect of the invention, an inclined surface is formed on the inner surface of the tip body in the vicinity of the tip of the wire insertion hole, and a tapered shape in contact with the inclined surface is formed on the side surface of the step portion of the power feed tip. A power supply chip according to an eighth aspect of the present invention.

  According to a tenth aspect of the present invention, an inclined surface is formed on a distal end side of the protruding portion of the chip body, and a tapered shape in contact with the inclined surface is formed at a proximal end portion of the power supply chip. 9 is a power supply chip according to the invention of item 9.

  In an eleventh aspect of the present invention, one or a plurality of vertical slits extending from the tip portion along the wire insertion hole are formed, and the power supply chip according to any one of the eighth to tenth aspects of the present invention It is.

  An eleventh aspect of the invention is the power feeding chip according to the eleventh aspect of the invention, characterized in that the tip is pressure-processed in a direction in which the diameter decreases.

In the welding torch of the present invention, the space formed between the inner surface of the chip holder and the tip of the power feed tip prevents heat generated during welding from being directly transmitted to the power feed tip. The rise can be suppressed. That is, since the wear of the power feed tip can be prevented and the wear can be reduced, the life of the power feed tip can be extended. In addition to this, the processing of the power supply tip itself can be reduced by eliminating the need for screw processing of the base end portion of the power supply tip, which has been conventionally performed, and making the shape only for simple processing. Further, a material having high hardness such as copper tungsten, which has been difficult to thread, can be used as the material of the power feed tip.

[Embodiment 1]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1 is a cross-sectional view of the welding torch 20 of the present invention, and FIG. 2 is an exploded cross-sectional view of the welding torch 20. 3A and 3B are views showing the power feed tip 28 of the welding torch 20 according to the present invention, where FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a bottom view. It is.

  1 and 2, the tip body 22 is attached to the tip of the torch body 21, and the tip holder 23 is attached to the tip of the tip body 22. The torch body 21, the chip body 22, and the chip holder 23 have wire insertion holes formed in the shaft core portion. Further, the tip body 22 has a protrusion 30 formed on the inner surface near the tip of the wire insertion hole.

  The power supply chip 28 has a wire insertion hole formed in the shaft core part, a base end part inserted into the chip body 22, and a tip part inserted into the chip holder 23. At this time, the power supply chip 28 has a base end portion in contact with the protruding portion 30 of the chip body 22, and a stepped portion 28 d formed on the side surface contacts the base end portion 23 a of the chip holder 23. That is, the power feed tip 28 is fixed by the protrusion 30 of the tip body 22 and the base end 23 a of the tip holder 23. In addition, a heat-resistant member 24 in which a wire insertion hole is formed in the shaft core portion is embedded in the tip portion of the tip holder 23 in order to reduce the way of transmission of arc heat generated at the welding point. It is even better if it is fixed with a mounting member such as. Alternatively, instead of embedding the heat-resistant member 24 in the tip portion of the chip holder 23, the entire chip holder 23 may be formed of a heat-resistant material such as ceramic or stainless steel.

  The orifice 17 is provided below the tip body 22, and the nozzle 16 surrounds the tip holder 23 and the orifice 17. The shielding gas is ejected through the ejection hole 17a of the orifice 17, and the shielding gas shields the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere. An insulating bush 18 is provided around the chip body 22.

  By having the structure described above, the power supplied to the torch body 21 flows through the chip body 22, the chip holder 23, and the power is supplied to the power supply chip 28. Further, a shielding gas is ejected to shield the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere.

  Next, the power supply chip 28 will be described with reference to FIG. As shown in the figure, the power feed tip 28 has a wire insertion hole 28f formed in the shaft core portion, and a step portion 28d that contacts the base end portion 23a (see FIG. 1) of the tip holder 23 is formed on the side surface. Has been. The step 28d is formed with the space 29 shown in FIG. 1 between the inner surface of the chip holder 23 and the front end 28a of the power supply chip 28 when the front end 28a of the power supply chip is inserted into the chip holder 23. Is done. The space 29 may be formed only in the tip portion 28 a of the power supply chip, but is preferably formed also between the inner surface of the chip holder 23 and the side surface of the power supply chip 28.

  As described above, the space 29 formed between the inner surface of the chip holder 23 and the tip 28a of the power feed tip prevents heat generated during welding from being directly transmitted to the power feed tip 28, so the power feed tip 28 itself. Temperature rise can be suppressed. In other words, since the power supply tip 28 can be prevented from being softened and wear can be reduced, the life of the power supply tip 28 can be extended. Furthermore, since the power supply chip 28 does not reach a high temperature, it is possible to prevent an oxide film from being formed on the surface of the power supply chip 28 and to maintain a good power supply.

  Further, by embedding the heat-resistant member 24 at the tip of the tip holder 23, the way of transmission of the arc heat generated at the welding point to the power supply tip 28 is blunted, and the wear of the power supply tip 28 is reduced, thereby further extending the life. be able to.

  As a preferred embodiment, a tapered shape 28c is formed on the side surface of the step portion 28d of the power supply chip 28, and an inclined surface 22a that is in surface contact with the tapered shape 28c of the side surface of the step portion 28d is formed on the tip portion of the chip body 22. It is good to keep. In this case, a wider contact area between the chip body 22 and the power feed chip 28 can be secured, so that stable power can be supplied to the power feed chip 28.

  Similarly, a taper shape 28e is formed at the base end portion of the power supply tip 28, and an inclined surface 30a that is in surface contact with the taper shape 28e of the base end portion of the power supply tip 28 is formed at the protrusion 30 of the chip body 22. Even better. In this case, a wider contact area can be secured and stable power can be supplied to the power supply chip 28, and at the same time, the power supply chip 28 can be stably fixed by the chip body 22 and the chip holder 23.

  Further, by forming the tapered shape 28c and the tapered shape 28e on the power supply chip 28 and increasing the contact area with the chip body 22, the heat of the power supply chip 28 is easily conducted to the chip body 22, and as a result, the heat is released to the outside. As a result, the power supply chip 28 itself does not accumulate heat and can extend its life.

  In addition, since the screw processing of the base end portion of the power supply tip 28 which has been conventionally performed is not required and the shape is only simple processing, the processing / manufacturing time of the power supply tip itself can be reduced. Further, as the material of the power supply tip 28, a material having high hardness such as copper tungsten, which has been difficult to thread, can be used.

  Returning to FIG. 3, the power supply chip 28 is formed with a vertical slit 28b extending from the tip 28a along the wire insertion hole 28f as shown in FIG.

  At the time of feeding the welding wire 5, the welding wire 5 is fed to the power feed tip 28 while being guided by a wire guide liner (not shown) from the wire feeding device 6 (see FIG. 5). At this time, the welding wire 5 has a little friction. Due to this friction, the surface of the welding wire 5 is damaged and, in some cases, is scraped, and at this time, shavings are generated. The shaving powder is sent to the tip of the power feed tip 28 through the wire guide liner. Usually, the gap between the wire insertion hole of the power feed tip 28 and the welding wire 5 is, for example, about 0.1 mm, and there is almost no gap. For this reason, when the shaving powder enters the wire insertion hole of the power supply tip 28, the feeding resistance increases, and the normal welding wire 5 cannot be fed, and appropriate welding is not performed.

  However, the welding torch 20 of the present invention has a structure in which the shavings of the welding wire 5 are pushed out through the gap of the vertical slit 28b of the power supply tip 28 and do not remain inside. The powder is not clogged inside the power supply chip 28 and does not cause poor feeding.

  As a preferred embodiment, the vertical slit 28b is preferably subjected to pressure processing in the direction in which the diameter decreases. FIG. 4 is a diagram illustrating the press working of the vertical slit 28b. FIG. 4A shows a state before pressure processing, and FIG. 4B shows a state after pressure processing.

  Since the welding wire 5 is forcibly pressed by the pressurized vertical slit 28b of the power supply tip 28, stable power supply can always be performed. Further, since the power supply tip 28 moves flexibly with the movement of the welding wire 5 by the vertical slit 28b, the power supply is stabilized and a uniform weld bead can be formed. Further, since the welding wire 5 is forcibly pressed by the pressurized vertical slit 28b, the welding wire 5 is always centered, and a remarkable effect can be obtained in preventing the deviation of the target position of the welding wire 5. . The number of vertical slots 28b is one, but the number of vertical slots is not limited to one, and a plurality of vertical slots may be formed.

  In the above-described embodiment, an embodiment using an arc welding robot has been described. However, the welding torch of the present invention is not limited to automatic welding by an arc welding robot, but can be applied to a semi-automatic welding torch for manual welding. Can do.

It is sectional drawing of the welding torch of this invention. It is an exploded sectional view of the welding torch of the present invention. It is a figure which shows the electric power feeding chip | tip of the welding torch of this invention. It is a figure which shows the pressurization process of the vertical slit part in the electric power feeding chip | tip of the welding torch of this invention. It is a figure which shows the general structure of an arc welding robot. It is sectional drawing of the welding torch of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manipulator 2 Wrist part 3 Welding torch 4 Wire reel 5 Welding wire 6 Wire feeder 7 Welding power supply 8 Gas cylinder 9 Teach pendant 10 Robot controller 12 Torch body 13 Tip body 13a Tip body tip 14 Feed tip 16 Nozzle 17 Orifice 17a Orifice ejection hole 18 Insulating bush 20 Welding torch 21 Torch body 22 Tip body 22a Inclined surface 23 inside chip body Tip holder 23a Tip holder proximal end 24 Heat-resistant member 25 Ring 28 Feed tip 28a Feed tip 28b Feeder chip vertical slit 28c Taper shape 28d of feed tip step 28e Feed tip step 28e Taper shape 28f of feed tip proximal end Wire insertion hole 29 Space 30 Tip body projection 30a Chip body The inclined surface of the projecting portion

Claims (12)

A torch body having a wire insertion hole in the shaft core, and
A chip body that is attached to the tip of the torch body and has a wire insertion hole in the shaft core, and a protrusion formed on the inner surface in the vicinity of the tip of the wire insertion hole;
A chip holder attached to the tip of the chip body and having a wire insertion hole in the shaft core; and
The base end portion is in contact with the protrusion of the chip body and a step portion is formed on the side surface where the base end portion of the chip holder contacts , and the chip does not have a screwing portion for attaching to the chip holder. A power supply chip having a wire insertion hole in the shaft core part, which is attached in a manner to be sandwiched between the protrusion part of the body and the base end part of the chip holder ,
The step of the power supply chip is formed so that a space is formed between the inner surface of the chip holder and the front end of the power supply chip when the front end of the power supply chip is inserted into the chip holder. Consumable electrode gas shielded arc welding torch.   2. The consumable electrode gas shield arc welding torch according to claim 1, wherein a taper shape is formed on a side surface of the step portion of the power supply tip, and an inclined surface that is in contact with the taper shape is formed at a tip portion of the tip body.   The taper shape is formed in the base end part of the said electric power feeding chip | tip, and the inclined surface which contacts the taper shape of the base end part of the said electric power feeding chip | tip is formed in the projection part of the said chip | tip body. 2. A consumable electrode gas shield arc welding torch according to 2.   The consumable electrode gas shield arc welding torch according to any one of claims 1 to 3, wherein the tip holder has heat resistance.   The consumable electrode gas shield arc welding torch according to any one of claims 1 to 4, wherein a heat-resistant member having a wire insertion hole in the shaft core portion is embedded in the tip portion of the tip holder.   The consumable electrode gas according to any one of claims 1 to 5, wherein the power supply tip is formed with one or a plurality of vertical slits extending from the tip portion along the wire insertion hole. Shielded arc welding torch.   The consumable electrode gas shielded arc welding torch according to claim 6, wherein a tip portion of the power supply tip is pressed in a direction in which the diameter decreases. A torch body having a wire insertion hole in the shaft core, and
A chip body that is attached to the tip of the torch body and has a wire insertion hole in the shaft core, and a protrusion formed on the inner surface in the vicinity of the tip of the wire insertion hole;
A power supply tip of a consumable electrode gas shield arc welding torch equipped with a tip holder attached to the tip portion of this tip body and having a wire insertion hole in the shaft core portion,
The power supply tip has a stepped portion whose base end abuts against the protrusion of the chip body and the base end of the tip holder abuts on a side surface , and has a screwing portion for attaching to the chip holder. It is attached in such a manner that it is sandwiched between the protruding part of the chip body and the base end part of the chip holder, and has a wire insertion hole in the shaft core part,
The step of the power supply chip is formed so that a space is formed between the inner surface of the chip holder and the front end of the power supply chip when the front end of the power supply chip is inserted into the chip holder. Characteristic power supply chip.   9. A power feeding device according to claim 8, wherein an inclined surface is formed on the inner surface of the tip body near the tip of the wire insertion hole, and a tapered shape in contact with the inclined surface is formed on a side surface of the step portion of the power feeding chip. Chip.   10. The power feeding according to claim 8, wherein an inclined surface is formed on a distal end side of the projecting portion of the chip body, and a tapered shape in contact with the inclined surface is formed on a proximal end portion of the power feeding chip. Chip.   11. The power supply chip according to claim 8, wherein one or a plurality of vertical slits extending from the tip portion along the wire insertion hole are formed.   The power feed tip according to claim 11, wherein the tip portion is pressed in a direction in which the diameter decreases.

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