JP5985202B2 - Power supply tip and consumable electrode gas shield arc welding torch - Google Patents

Description

  The present invention relates to an improved power supply tip for supplying power to a welding wire and a consumable electrode gas shield arc welding torch (hereinafter referred to as a welding torch) using the same.

  Today, in order to improve the work efficiency of welding, it is widely performed to automate welding using a welding robot. (For example, refer to Patent Document 1.) FIG. 2 is a diagram showing a general configuration of a welding robot when an articulated robot is used. 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 attached to the welding torch 3 by a welding wire feeding device 6 attached to the manipulator 1. Be sent. Further, electric power is supplied from the welding power supply device 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.

  A conventionally used welding torch 3 attached to the wrist 2 of the manipulator 1 will be described with reference to FIG. FIG. 3 is a cross-sectional view of a conventional welding torch 3. In the figure, a tip body 13 is attached to a tip portion of a torch body 12, and a power feed tip 14 is attached to a tip portion 13a of the tip body. These torch body 12, tip body 13, and power feed tip 14 have wire insertion holes formed 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 shielding gas passes through the ejection hole 17a provided in the orifice 17 and is ejected from the tip of the nozzle 16, and this 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 13.

JP 2003-94168 A

  When the base end portion of the above-described conventional power feed tip 14 is screwed into the tip end portion 13a of the tip body, the position of the wire insertion hole of the power feed tip 14 with respect to the welding torch 3 is fixed. Therefore, when the welding wire 5 is supplied to the welding torch 3 during welding, the welding wire 5 comes into contact with the tip end portion 14a of the wire insertion hole of the power supply tip 14, but the contact position is almost the same position. Therefore, only the position where the welding wire 5 is in contact with the tip portion 14a of the wire insertion hole of the power supply tip 14 is partially worn, so that the shape of the tip portion becomes elliptical.

Thus, when the shape of the tip 14a of the wire insertion hole becomes elliptical, the protruding length L from the tip 14a of the wire insertion hole of the power supply tip 14 to the tip 5a of the welding wire is, for example, 15 mm. The position of the tip 5a of the welding wire is considerably shifted as compared with that before the wear, and the target position of the welding wire 5 with respect to the base material is shifted, and the accuracy of the target position of the welding wire 5 taught by the welding robot is shifted. There is a problem that decreases.

Further, if the shape of the tip 14a of the wire insertion hole is worn and becomes elliptical, the feeding position with the welding wire 5 fluctuates and stable feeding cannot be performed, resulting in poor penetration into the base material and poor weld bead appearance. Occur. Therefore, it is necessary to replace the power supply tip 14 with a new one before the shape of the tip 14a of the wire insertion hole is worn and becomes elliptical.

  It is an object of the present invention to provide a power supply tip and a consumable electrode gas shield arc welding torch that can extend the life of the power supply tip.

In order to solve the above-described problems, the invention of claim 1
A torch body in which a wire insertion hole is formed in the shaft core,
A wire body insertion hole is formed in the shaft core, and a tip body attached to the tip of the torch body;
A wire insertion hole is formed in the shaft core portion, attached to the tip portion of the tip body, and a power supply tip for supplying power to the welding wire;
In the power supply tip of the consumable electrode gas shield arc welding torch that includes the nozzle that surrounds the power supply tip and the shield gas is ejected,
The power supply chip is
An outer peripheral groove is formed, and a chip body in which a plurality of vertical grooves are formed in the axial direction on the base end side than the outer peripheral groove , and
An axial locking protrusion corresponding to the outer peripheral groove is formed on the inner surface, and a plurality of slits are formed in the axial direction toward the proximal end, and the thickness of the proximal end is flexible. A chip cap formed on the inner surface of the base end portion and formed with a plurality of rotation-direction locking protrusions fitted in the plurality of longitudinal grooves of the chip body, and the base end portion is placed on the tip end portion of the chip body; It is the electric power feeding chip characterized by comprising.

The invention of claim 2
A consumable electrode gas shielded arc welding torch using the power feed tip according to claim 1.

  According to the welding torch of the present invention, even if the tip of the wire insertion hole of the power feed tip is worn and becomes elliptical, the welding operator rotates the tip cap with respect to the axial center portion of the tip body, and the wire insertion hole Since it can adjust so that a welding wire may contact the place which is not worn in the tip part of a wire, it can prevent that the position of the tip part of a welding wire in the tip part of a wire penetration hole shifts. Therefore, the accuracy of the target position of the tip of the welding wire taught by the welding robot can be maintained without shifting the target position of the tip of the welding wire with respect to the base material.

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 general structure of the robot for welding when using an articulated robot. It is sectional drawing of the welding torch 3 of a prior art.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1A is an exploded perspective view of the welding torch 21 of the present invention as viewed from the distal end side of the power feed tip 22, and FIG. 1B is from the base end 23 b side of the tip cap of the power feed tip 22. FIG. In the figure, the power feed tip 22 is composed of a tip body 24 and a tip cap 23, and wire insertion holes are formed in the respective shaft core portions. The screw portion 25 formed on the base end portion 24b of the chip body is screwed into the tip end portion 13a of the chip body, and the base end portion 23b of the chip cap is put on the tip end portion 24a of the chip body. The welding wire 5 is inserted into and contacted with the tip 23a of the wire insertion hole of the tip cap 23 to supply power.

An outer peripheral groove 26 is formed on the outer periphery of the chip body 24. An axial locking projection 28 (not shown) corresponding to the outer peripheral groove 26 of the chip body 24 is formed on the inner surface of the chip cap 23. A plurality of slots 27 are formed in the axial direction in the base end portion 23b of the chip cap.

This slot 27 is formed, for example, so that the base end portion 23b of the chip cap is divided into six. When the tip cap 23 is put on the tip end portion 24a of the chip body, the base end portion 23b of the tip cap abuts on the outer peripheral portion of the tip end portion 24a of the chip body, and a plurality of slots 27 are formed on the tip end portion 24a of the chip body. When the axial locking protrusions 28 of the chip cap 23 reach the outer peripheral groove 26 of the chip body 24 by being pushed and spread by the outer peripheral part, the axial locking protrusions 28 of the chip cap 23 become the outer peripheral groove of the chip body 24. 26. In order to be able to do this, the thickness of the base end portion 23b of the chip cap in which the slit 27 is formed is determined so as to have flexibility. The tip cap 23 is prevented from dropping from the chip body 24 by fitting the axial locking projection 28 of the chip cap 23 into the outer peripheral groove 26 of the chip body 24.

A plurality of vertical grooves 29 are formed in the axial direction in the outer peripheral portion of the chip main body 24 on the base end portion 24b side of the chip main body with respect to the outer peripheral groove 26, and on the inner surface of the base end portion 23b of the chip cap. A plurality of rotation direction locking protrusions 30 are formed so as to be fitted in the vertical grooves 29. When the slot 27 of the chip cap 23 is divided into, for example, six, a total of six rotation direction locking projections 30 are formed on the inner surface of the base end portion 23b of the chip cap between the slots 27, and the chip body Six vertical grooves 29 are formed on the outer peripheral portion of 24.

After the chip cap 23 is put on the chip body 24, the six rotation direction locking projections 30 formed on the inner surface of the base end portion 23b of the chip cap are fitted into the six vertical grooves 29 of the chip body. Further, when the chip cap 23 is rotated with respect to the axial center portion of the chip body 24, the six rotation direction locking projections 30 of the chip cap 23 are placed between the six vertical grooves 29 of the chip body 24. When the six slits 27 spread in contact with each other and are moved until the six rotation direction locking protrusions 30 of the chip cap 23 reach the six adjacent longitudinal grooves 29 of the chip body 24, respectively, the chip cap The six rotation direction locking projections 30 of 23 are fitted into the six adjacent vertical grooves 29 and fixed and positioned. In order to be able to do this, the thickness of the base end portion 23b of the chip cap in which the slit 27 is formed is determined so as to have flexibility. For the other functions, the same functions as those of the conventional welding torch 3 shown in FIG.

  The operation will be described below. In the welding torch 21 of the present invention, the base end portion 23 b of the tip cap is put on the outer peripheral portion of the tip end portion 24 a of the chip main body, and the axial locking projection 28 on the inner surface of the chip cap 23 is the outer peripheral portion of the chip main body 24. The outer peripheral groove 26 formed in This prevents the chip cap 23 from falling from the chip body 24. In addition, a plurality of rotation direction locking protrusions 30 formed on the inner surface of the base end portion 23 b of the chip cap are fitted into a plurality of vertical grooves 29 of the chip body 24 and fixed and positioned. A screw portion 25 formed at the base end portion 24b of the chip body is screwed into the tip end portion 13a of the chip body. This welding torch 21 is attached to the tip of the wrist 2 of the manipulator 1 of the welding robot.

When welding is started and the welding wire 5 is supplied to the welding torch 21, the welding wire 5 comes into contact with the distal end portion 23 a of the wire insertion hole of the power feed tip 22 and is fed to perform welding. When welding is performed for a long time, since the contact position between the welding wire 5 and the tip end portion 23a of the wire insertion hole is substantially the same position, only the position where the welding wire 5 of the tip end portion 23a of the wire insertion hole is in contact is a part. As a result, the tip end portion 23a of the wire insertion hole becomes elliptical. At this time, the chip cap 23 is rotated with respect to the axial center portion of the chip body 24 so that, for example, six rotation direction locking protrusions 30 of the chip cap 23 are formed in, for example, six vertical grooves 29 of the chip body 24. , Each of the adjacent vertical grooves 29 is fitted and fixed to be positioned. And welding is resumed.

  As a result, in the welding torch 21 of the present invention, even if the tip of the wire insertion hole of the power feed tip 22 is worn and becomes elliptical, the welding operator holds the tip cap 23 against the axial center portion of the tip body 24. The welding wire 5 can be adjusted by rotating it so that the welding wire 5 is brought into contact with a place where the tip end portion 23a of the wire insertion hole of the tip cap 23 is not worn. Therefore, it can prevent that the position of the front-end | tip part 5a of the welding wire in the front-end | tip part 23a of a wire penetration hole shifts | deviates. Therefore, the accuracy of the target position of the tip portion 5a of the welding wire taught by the welding robot can be maintained without shifting the target position of the tip portion 5a of the welding wire with respect to the base material.

  In the welding torch according to the prior art, the tip 14a of the wire insertion hole of the power supply tip 14 is worn and becomes elliptical, and the power supply tip 14 is replaced. However, the welding torch 21 of the present invention has improved welding quality. Since the power supply chip 22 can be used continuously while maintaining it, the life of the power supply chip 22 can be extended and a significant cost reduction can be achieved. Furthermore, when there is no place where the power supply tip 22 is not worn out, it is only necessary to replace the tip cap 23. Therefore, the cost can be reduced compared to replacing the power supply tip 22 as a whole. The amount of waste material can be reduced.

Further, the shape of the tip 23a of the wire insertion hole of the power feed tip 22 is worn, the worn surface becomes rough, the contact resistance with the welding wire 5 increases, the welding current value changes, and the welding wire 5 feeds power. The contact with the tip end portion 23a of the wire insertion hole of the chip 22 does not become unstable and power feeding failure does not occur. Even if the shape of the tip 23a of the wire insertion hole of the power feed tip 22 is worn and becomes elliptical, the welding operator rotates the tip cap 23 with respect to the axial center portion of the tip main body 24 so that the power feed tip 22 Since it can be adjusted so that the welding wire 5 is brought into contact with a place where the tip end portion 23a of the wire insertion hole is not worn, the feeding position with the welding wire 5 does not fluctuate and stable feeding cannot be performed. Further, the welding wire 5 can be fed stably, and arc breakage does not occur. Therefore, the welding current value does not become unstable, so that the penetration into the base metal and the appearance of the weld bead do not become poor.

  In the power feeding tip 22 of the welding torch 21 of the present invention described above, a plurality of rotation direction locking projections 30 are formed on the tip cap 23, and a plurality of rotation direction locking projections 30 corresponding to the plurality of rotation direction locking projections 30 are formed on the chip body 24. A vertical groove 29 is formed. Instead of forming the rotation direction locking protrusions 30 and the vertical grooves 29, the base end side of the outer peripheral groove 26 of the chip body 24 may be formed in a cylinder. In this case, when the tip cap is rotated with respect to the axial center portion of the tip body, the tip end portion of the tip cap is flexible so that friction is generated in which the tip end portion of the tip cap stops at the tip end portion of the tip body. What is necessary is just to have it. In this case, the thickness of the base end portion of the chip cap formed with the slit is determined so as to have this flexibility.

The above-described welding torch 21 of the present invention has been described with respect to the case where it is attached to a welding robot. However, the present invention is not limited to this case, and is applied to semi-automatic arc welding in which welding is performed by holding the welding torch in hand. be able to.

DESCRIPTION OF SYMBOLS 1 Manipulator 2 Wrist part 3 Welding torch 4 Wire reel 5 Welding wire 5a Welding wire tip 6 Welding wire feeding device 7 Welding power supply device 8 Gas cylinder 9 Teach pendant 10 Robot control device 12 Torch body 13 Tip body 13a Chip body Tip 14 Feed tip 14a Feed tip 16 Nozzle 17 Orifice 17a Orifice ejection hole 18 Insulating bush 21 Consumable electrode gas shield arc welding torch (welding torch)
22 Power feeding chip 23 Chip cap 23a Tip end portion 23b Tip cap base end portion 24 Chip body 24a Tip body tip end 24b Chip body base end portion 25 Tip body screw portion 26 Chip body outer peripheral groove 27 Chip cap Slot 28 Axial locking protrusions 29 of chip cap Vertical groove 30 of chip body Rotating locking protrusions L of chip cap Projection length

Claims (2)

A torch body in which a wire insertion hole is formed in the shaft core,
A wire body insertion hole is formed in the shaft core, and a tip body attached to the tip of the torch body;
A wire insertion hole is formed in the shaft core portion, attached to the tip portion of the tip body, and a power supply tip for supplying power to the welding wire;
In the power supply tip of the consumable electrode gas shield arc welding torch that includes the nozzle that surrounds the power supply tip and the shield gas is ejected,
The power supply chip is
An outer peripheral groove is formed, and a chip body in which a plurality of vertical grooves are formed in the axial direction on the base end side than the outer peripheral groove , and
An axial locking protrusion corresponding to the outer peripheral groove is formed on the inner surface, and a plurality of slits are formed in the axial direction toward the proximal end, and the thickness of the proximal end is flexible. A chip cap formed on the inner surface of the base end portion and formed with a plurality of rotation-direction locking protrusions fitted in the plurality of longitudinal grooves of the chip body, and the base end portion is placed on the tip end portion of the chip body; A power supply chip characterized by comprising: A consumable electrode gas shield arc welding torch using the power supply tip according to claim 1.

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