JPH07290247A - Arc welding contact tip and production thereof - Google Patents

Abstract

PURPOSE:To provide an arc welding contact tip which can obtain the uniform welding result over a long time, and which can be produced papidly and inexpensively. CONSTITUTION:In an arc welding contact tip 3 having a through hole to pass a consumable electrode at the axial center, respective tops of a tip body member 1 formed of a soft conductive metal, and a feed tip member 2 arranged at the top end side of the tip body member 1 and being formed of a hard copper alloy are friction welded in the direction orthogonal to the longitudinal axis of the contact tip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact tip for arc welding used in a welding operation, in which a consumable electrode wire is fed while being fed by a welding torch and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, in arc welding work using a consumable electrode wire, a through hole is formed in the shaft core of a contact tip mounted on a welding torch, and the electrode wire is fed through the through hole while feeding power from the contact tip. Are doing. By the way, at the time of power feeding, the contact portion between the electrode wire and the contact tip becomes hot, and the through hole of the contact tip tends to be worn due to the feeding of the electrode wire. When the electrode through hole of the contact tip is worn in this way, the state of power supply to the electrode wire changes, and a uniform welding result cannot be obtained.

In order to deal with this, a conventional method, for example, FIG.
As shown in (A), the chip body portion 1 ′ and the core portion 2
′ Together with the contact tip 3 ′, and a tip body portion in which a through hole 101 for feeding an electrode wire is provided in a shaft core portion, and a screw portion 102 for attaching to a welding torch (not shown) is provided at one end portion. 1'is made of relatively soft copper or copper alloy, and an axial recess 106 is formed at the other end of the chip body 1 '. Further, the core portion 2'has a through hole 201 in the shaft core portion and is formed of a hard conductive metal having excellent heat resistance and wear resistance. The core 2 ′ is pressed into the recess 106 by a so-called swaging process in which the chip body 1 ′ is loosely inserted into the recess 106 and then the chip body 1 ′ is radially pressed from the outside.

Further, conventionally, FIG. 9 (B) and FIG.
The structure shown in (C) has been proposed. That is, as shown in FIG. 9 (B), a circumferential groove 202 is provided outside the core portion 2 ′ made of a hard material, or as shown in FIG. 9 (C), a step portion 203 is formed in the core portion 2 ′. When the contact tip 3'is provided with swaging, the circumferential groove 202 or the stepped portion 203 and the tip body portion 1'made of a soft material are engaged and locked. .

During the swaging process for the contact tip 3'shown in FIGS. 9A to 9C, as shown in FIG. 9D, the core portion 2'has a relatively inner diameter. A large through hole 201 is provided, and in a state where the core portion 2'is inserted into the recess 106 of the chip body portion 1 ', the through holes 201, 1 of the core portion 2'and the chip body portion 1'are provided.
01, a hard wire 50 having a diameter slightly larger than the desired diameter of the electrode wire is inserted, and the swaging dies 51 to 54 are pressed in the radial direction from the outside of the chip body 1'to perform swaging. Is being carried out.

Furthermore, conventionally, a wear resistant member having a through hole for an electrode wire has been attached to the tip of the chip body by shrink fitting, bonding or brazing.

[0007]

However, as shown in FIG. 9, when the recess 106 of the chip body 1'and the core 2'are locked by so-called cold working, the following problems occur. is there. That is, the welding current is supplied to the tip body 1 ′ → the core 2 ′ → the electrode wire,
Especially when welding, the tip of the contact tip is exposed to arc heat,
That is, the contact portion and its vicinity have high temperatures. By the way, focusing on the engaging portion between the chip body 1'and the core 2 ', the coefficient of thermal expansion of the chip body 1'is larger than the coefficient of thermal expansion of the hard core 2'. Therefore, that is, since the coefficient of thermal expansion of the chip body 1 ′ enclosing the core part 2 ′ is large, if the temperature of the power feeding part becomes high as described above, the chip shown in FIG. Main body 1'and core 2
The locked state of the locking part with ′ becomes loose.

Further, for example, in a semi-automatic arc welding operation, the welding torch gripped by the operator is left undisturbed on the work piece or the work table after welding. At some times, as described above, the engagement between the tip body 1'and the core 2'is loose, so if the impact force that accompanies leaving the welding torch is added, the state shown in FIG. In the contact tip 3'shown, loosening of the engaging portion between the tip body portion 1'and the stopping portion 2'is promoted. As a result, the core portion 2'is slightly displaced from the tip body portion 1'in the long axis direction or in the rotation direction, and the contact state between the core portion 2'and the tip body portion 1'is delicately. Change. In the welding work, the welding work is repeated with one cycle from the start of welding to the end of welding. As the welding work is repeated, the core portion 2'and the tip body portion 1'are displaced. The amount becomes large,
Since the power supply state from the tip body portion 1'to the core portion 2'changes from the initial state, a uniform welding result cannot be obtained. Of course, by repeating the welding operation, loosening of the locking portion between the tip body portion 1'and the stopping portion 2'is further promoted, and in an extreme case, the core portion 2'is replaced by the tip body portion 1 '. The contact tip 3'becomes expensive because the contact tip 3'is frequently replaced with the contact tip 3'replaced frequently.

Also, in a contact chip in which a wear resistant member having a through hole for an electrode wire is attached to the tip of the chip body by shrink fitting, bonding or brazing,
As described above, in combination with the fact that the tip of the contact tip has a high temperature and the coefficient of thermal expansion of the wear resistant member and the chip body are different, the wear resistant member and the chip body are as described above. Since the impact force acts on the mounting part of the and the wear resistant member is released from the mounted state, the wear resistant member is detached from the tip body part, the welding work becomes impossible, and the contact tip is frequently used. As a result, the contact tip was expensive.

Furthermore, FIG. 9 (B) and FIG. 9 (C)
In the structure shown in Fig. 3, it takes time to process the circumferential groove 202 and the stepped portion 203 as described above on the hard core portion 2'which is difficult to process, resulting in an expensive contact tip. Was there.

On the other hand, the main purpose of the swaging process shown in FIG. 9D is to conform the through hole 201 of the core 2'to the hard wire 50. By the way, the swaging dies 51 to 54 press the hard core 2'through the soft chip body 1 ', so that the core 2'
Before the through-hole 201 of FIG. 1 fits into the hard wire 50, the soft chip body 1'deforms, that is, deforms in the long axis direction of the chip body 1 '. Therefore, in order to manufacture a contact chip having a desired shape, a soft chip body 1 '
Depending on the material, the material of the core 2'which is hard, and the desired shape of the contact tip 3 ', the swaging conditions such as the material of the die, the pressing force and the cycle of the pressing time and the pressing stop time are searched for each time. At present, the optimum value is selected. Therefore, it takes time to introduce the swaging device and select the conditions, and as a result, there is a problem that the contact tip 3'becomes expensive.

The present invention has been made in view of the above problems, and an object thereof is to manufacture it quickly and at low cost.
Moreover, it is an object of the present invention to provide a contact tip and a method of manufacturing the same, which can obtain a uniform welding result over a long period of time.

[0013]

The first invention is applied to an arc welding contact tip having a through hole for a consumable electrode in a shaft core. The characteristic is that the tip body member formed of a soft conductive metal and the tip end member for power supply, which is arranged on the tip side of the tip body member and formed of a hard copper alloy, are provided. That is, the end portions were friction welded in the direction orthogonal to the long axis of the contact tip. A second invention is characterized in that, in the first invention, the tip body member and the tip member each have an outer shape portion having a non-circular cross section. A third invention is characterized in that, in the first or second invention, the tip member is made of chrome copper or a chrome copper alloy. The fourth invention is applied to a method for manufacturing an arc welding contact tip having a consumable electrode through hole in a shaft core. The characteristic is that the tip body member formed of a soft conductive metal and the tip end member for power supply which is disposed on the tip side of the tip body member and formed of a hard copper alloy are opposed to each other. Supported by a pair of chucks and pressing the respective end portions of the tip body member and the tip member supported by the chuck while relatively rotating the tip body member and the tip member, the long axis of the contact tip Friction welding in a direction orthogonal to 5th invention, 4th
In the invention, the tip body member and the tip member each have an outer shape portion having a non-circular cross section. According to a sixth aspect of the present invention, in the fourth or fifth aspect, during friction welding, when the relative rotation of the tip body member and the tip member is stopped, the tip body member and the tip member are relatively pressed with a pressing force larger than that before the stop. The feature is that it is pressed positively. In a seventh aspect based on the fifth or sixth aspect, at least one chuck of the pair of chucks for supporting the tip body member and the tip member is the tip body member or the tip member with respect to the claw of the chuck. It is characterized in that it is movably supported in the long axis direction. An eighth invention is characterized in that, in the fourth to seventh inventions, the tip member is made of chrome copper or a chrome copper alloy. A ninth invention is characterized in that, in the fourth to eighth inventions, an axial dent portion is formed at an end portion of the tip body member to be friction-welded. A tenth invention is characterized in that, in the fourth to ninth inventions, an axial dent portion is formed at an end portion of the tip member to be friction-welded. An eleventh invention is characterized in that, in the fourth to tenth inventions, the tip member is processed by a forging method before friction welding. The twelfth invention is the fourth invention
The invention of any one of claims 1 to 10 is characterized in that the tip body member is processed by a forging method or a cutting method before friction welding. A thirteenth invention is the invention according to the fourth to eleventh inventions, wherein the tip member is processed by a forging method before friction welding, and the tip body member is processed by a forging method or a cutting method after performing friction welding. It is characterized by being processed. A fourteenth invention is characterized in that, in the fourth to thirteenth inventions, after the friction welding, drilling is performed from the end portion side of the tip body member to the friction welding portion of the electrode through hole. A fifteenth invention is characterized in that, in the fourth to tenth inventions, the tip member and the tip body member are processed after friction welding.

[0014]

In the contact tip for arc welding and the method for manufacturing the same according to the present invention, the tip body member formed of a soft conductive metal and the tip body member of the tip body member are made of a hard copper alloy. The respective ends of the formed tip member for power feeding are friction welded in the direction orthogonal to the long axis of the contact tip. Therefore, the tip body member and the tip member are securely and integrally fixed by friction welding, and even if the tip member is in a high temperature state when performing arc welding work using the present contact tip, The adhered state between the main body member and the tip member does not change, and therefore, the electrode wire can be fed in a constant state from the start to the end of the arc welding operation. Of course, the contact tip for arc welding is manufactured by the friction welding device which is a low-priced equipment, but in combination with the small cross-sectional area of the tip body and the tip member to be friction welded, the friction welding device is mechanically operated. Since the tip body member and the tip member supported by the positioned chucks facing each other are friction-welded, the tip body member and the tip member are integrally fixed coaxially.

[0015]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes a chip body member formed of a soft conductive metal. For example, the chip body member 1 is formed by rolling or forging including so-called swaging, and a through hole 101 and a mounting screw portion 102 are formed. , Parallel part 103 for spanner, tapered tip part 104, through hole 1
01, a tapered hole 105 for guiding the electrode wire and an axial recess 4 at the tip of the tip body member 1 are appropriately formed. Reference numeral 2 is a tip member made of a copper alloy harder than the chip body member 1 and having a through hole 201 and having good wear resistance and having good wear resistance. For example, the tip member 2 is a columnar member or a tubular member. In the through hole of
Desired outer diameter, eg 0.1 than the electrode wire diameter used
After inserting a hard wire having a large outer diameter of about mm to 0.3 mm and applying so-called swaging from the outside of the tip member 2, the through hole 201 of the tip member 2 is fitted to the hard wire, and then the tip is The member 2 is cut to a desired length. Figure 1
The chip body member 1 and the tip member 2 shown in FIG.
1 are friction-welded in the feeding direction of the electrode wires, that is, in the direction orthogonal to the major axis direction of the contact tip 3 described later, while being relatively rotated while pressing the respective end portions.
As shown in (B), they are integrally fused.

For example, referring to FIG. 4, the friction welding apparatus 10
A main shaft 12 is rotatably supported by a proper bearing (not shown) on the headstock 11 of the main shaft 12, and the main shaft 12 is rotated by a fluid pressure rotary machine such as hydraulic pressure or compressed air or a rotary drive machine 14 such as an electric motor. It is rotated via a rotation transmission member 13 such as a belt or a chain. 15 is the spindle 12
Is a first chuck that is integrally attached to and is rotatable. Reference numeral 16 denotes a movable base linearly movably supported by a guide member 17, and the movable base 16 is moved by a suitable drive mechanism 18 so as to approach and separate from the first chuck 15. For example, the rotary shaft 20 rotatably supported by the fixed base 19 is rotated via the rotation transmission member 21 by the rotary drive machine 22 similar to the above. A ball screw 23 is formed on the rotary shaft 20,
The ball screw 23 is engaged with a ball nut 24 fixed to the moving table 16. The drive mechanism 18 for the movable table 16 is configured by the above 19 to 24. Reference numeral 25 is a second chuck attached to the movable table 16 and includes claws 151 of the first and second chucks 15 and 25.
.. 251, 252, ... Can be expanded and contracted in the radial direction similarly to a so-called chuck of a machine tool.

The tip body member 1 and the tip member 2 are fixed to the first and second chucks 15 and 25 of the friction welding apparatus 10 so that they are relatively opposed to each other, and are gripped by the first chuck 15. In addition, for example, the chip body member 1 is rotated by the rotation driving machine 14, and the driving mechanism 1
The moving table 16 is moved to the headstock 11 side by 8 and the second
The tip member 2 held by the chuck 25 is pressed against the tip body member 1, and after a predetermined time or after the movable table 16 is moved by a predetermined amount, the movable table 16 is separated from the headstock 11 to complete the friction welding. The drive mechanism 18 of the movable table 16 linearly movably supported by the guide member 17 is a well-known mechanism such as a cylinder lot and a cylinder of a so-called fluid pressure cylinder that is reciprocated by hydraulic pressure or compressed air. The fixed base 19 and the movable base 16 can be relatively supported, or the rack and pinion of a so-called rack-pinion mechanism and the fixed base 19 and the movable base 16 can be relatively supported. By the friction welding, as shown in FIG. 1B, the tip body member 1 and the tip member 2 are welded to form the arc welding contact tip 3.

Although the contact surface between the tip body member 1 and the tip member 2 is softened by frictional rotation, as the form of friction welding, the tip body member 1 and the tip member 2 are pressed while the tip body member is pressed. 1 and the tip member 2 are rotated relative to each other, but they are rotationally driven after the first chuck 15 is rotated for a predetermined time or when the moving table 16 is moved by a predetermined amount by an appropriate detecting means. The machine 14 is stopped, and thereafter the movable table 16 is controlled so as to be separated from the first chuck 15, or alternatively, the rotary drive machine 14 is operated.
It is possible to control the position of the moving table 16 so that the pressing force between the tip body member 1 and the tip member 2 after the rotation is stopped becomes larger than the pressing force before the rotation is stopped.

By the way, the diameter of the consumable electrode wire used for arc welding is, for example, about 0.4 to 2.0 mm, and the outer diameter of the tip member 2 varies somewhat depending on the diameter of the applied electrode wire. The outer diameter of the tip member 2 is appropriately selected as a rough value of about 4 to 8 mm. For example, when the diameter of the electrode wire is 1.0 or 1.2 mm, the outer diameter of the tip member 2 is preferably about 5 to 6 mm.

Tip body member 1 in the above friction welding
Table 1 shows the combinations of the respective materials of the tip member 2 and the tip member 2.
In addition, as the copper shown in Table 1, oxygen-free copper, tough pitch copper, and phosphorus deoxidized copper are collectively referred to.

[0021]

[Table 1]

In the above friction welding, although it depends on the rotational speed of the main shaft 12 and the pressing force of the movable table 16, as described above, the outer diameter of the tip member 2 is about 8 mm at the maximum, and therefore the combination numbers in Table 1 to The material could be friction welded in substantially 3 to 5 seconds.

By the way, as shown in FIG. 4, for example, the friction welding apparatus includes a mechanism for rotating the first chuck 15 and a second chuck supported by the moving table 16 so as to face the first chuck 15. Since it has a simple structure composed of the drive mechanism 18 for linearly moving 25, the equipment cost is lower than that of other welding devices.

For example, in the case of an electron beam welding device,
Since an electron beam generator, various focusing coil mechanisms for controlling the electron beam, a vacuum chamber, and various electrical / mechanical control devices are required, the equipment cost becomes extremely high.

In addition, a laser welding apparatus requires a power source for laser, a laser oscillator, a laser resonator, various optical transmission devices, a laser torch, etc., and therefore, like the electron beam welding apparatus, the equipment cost is extremely high. It becomes expensive.

Further, when applying the arc welding apparatus,
The material of the contact tip which is the subject of the present invention is a non-ferrous metal and has a small cross-section.
The G arc welding equipment is applicable. In this case, a TIG welding power source, a TIG welding torch, cables for power feeding and grounding, etc. are required, and are therefore more expensive than the friction welding apparatus. Moreover, it is necessary to appropriately supplement the shielding gas for TIG welding and the TIG welding electrode as consumables while monitoring the respective conditions. If the welding is performed by the TIG arc welding apparatus, the manufacturing cost of the contact tip is As a result, the cost is higher than that of friction welding.

Further, in the case of an electric resistance welding apparatus, not only is the apparatus expensive, but a heavy and bulky electric resistance welding power source is a hindrance to the work, and high voltage power receiving equipment is required. Therefore, if the welding is performed by the electric resistance welding device, the manufacturing cost of the contact tip is higher than that of the friction welding as a result.

As described above, in the arc welding contact tip and the method for manufacturing the same according to the present invention, the tip body member formed of the soft conductive metal and the tip body member of the tip body member are arranged to be hard. The respective ends of the power supply tip member formed of the copper alloy of (1) and (2) are friction welded in a direction orthogonal to the long axis of the contact tip. Therefore, the tip body member and the tip member are securely fixed to each other by friction welding.

Further, since the tip body member and the tip member, which are mechanically positioned by the friction welding apparatus and supported by the chucks facing each other, are friction welded, the tip body member and the tip member are integrally fixed coaxially. To be done.

Of course, when performing an arc welding operation using the contact tip for arc welding according to the present invention,
Even if the tip member becomes hot, the adhesion state between the tip body member and the tip member does not change.Therefore, supply power to the electrode wire in a constant state from the beginning to the end of the arc welding work. You can Therefore, uniform welding results can be obtained.

In addition, in the arc welding contact tip according to the present invention, since the friction welding of the tip body member and the tip member is small, the friction welding work between the tip body member and the tip member can be performed in an extremely short time. That is, it is carried out quickly. Further, as described above, the friction welding device is a cheaper equipment than other welding devices, so that the contact tip for arc welding can be manufactured at a low cost.

Further, the tip member is made of a hard copper alloy, and the tip body member is made of a conductive metal softer than the tip member. The tip member for supplying power while contacting the electrode wire is made of hard copper. Since it is an alloy, wear of the tip member is small, it is possible to use a contact tip for arc welding over time, and since the tip only needs to be formed in a columnar shape having a through hole for an electrode wire, it is possible to use hard copper. Even with alloys, the tip member can be relatively easily manufactured, and it is softer than the tip member that the conventionally required processing such as the screw part and the spanner hook part for attaching to the welding torch is performed. In addition, since the tip body member is made of an inexpensive conductive metal, the tip body member can be easily and inexpensively manufactured. Therefore, the arc welding contact as a whole. A-up can be quickly and inexpensively manufactured.

Further, if the tip member is made of chrome copper or a chrome copper alloy, the arc welding current can be efficiently supplied to the electrode wire and the abrasion resistance is good, so that it is suitable for arc welding over time. Contact tips can be used.

By the way, in friction welding, two objects to be welded are relatively rotated while being pressed. The larger the radius is with respect to the axis of rotation, the higher the rotation speed and the greater the degree of melting. Becomes However, if one or both of the tip body member and the tip member are friction-welded at their end portions with axial recesses, the tip body member and the tip body member are rotated relatively during friction welding. The abutting portion of the rotary shaft core of the tip member is lost. That is, since there is no contacting portion in the vicinity of the rotating shaft core portion where the rotation speed is extremely low, in other words, there is no portion that is difficult to melt, the friction welding of the tip body member and the tip member is performed well. Furthermore, during friction welding, the softened portion of the through hole side of the electrode wire is set in the axial recessed portion, and so-called burrs can be generated by friction welding into the through hole of the electrode wire. Decrease. Therefore, it is conceivable that a contact tip that does not interfere with the feeding of the electrode wire can be manufactured without performing processing after friction welding. Of course, it is preferable to provide the axial recessed portion in the chip body member made of a soft material that can be easily processed.

If the axial dents are provided on both the tip body member and the tip member, the swollen amount of the softened portion can be increased, and therefore, the amount of melting and the stronger friction can be increased. Welding can be performed.

Of course, the shape of the axial dent portion can be freely selected. For example, as shown in FIG. 2, a stepped axial dent portion 4 and a tapered axial dent portion 4 are provided. Can be provided at the ends of the tip body member 1 and the tip member 2, or can be provided at the ends of the tip body member 1 and the tip member 2.

Furthermore, if the tip member is processed by a forging method before friction welding, the through hole of the tip member fits into the hard wire inserted in the shaft core of the tip member. When forging, that is, swaging, the tip member made of a hard material can be directly pressed by a die, so that the tip member can be accurately formed with a through hole conforming to the hard wire, and easily. Can be manufactured. In this way, the through hole of the tip member is accurately conformed to the hard wire and is work hardened, which increases wear resistance and the surface of this through hole becomes smooth, so that the contact friction resistance with the electrode wire is increased. Is reduced and the feedability of the electrode wire is improved.

Further, if the tip body member is processed by a forging method or an appropriate cutting method before friction welding, the tip body member can be easily manufactured. Of course, if the tip body member is processed by the forging method, it is cheaper than the cutting method,
The chip body member can be manufactured quickly and easily.

Furthermore, if the tip member is processed by a forging method before friction welding and the tip body member is processed by a forging method or a cutting method after performing friction welding, When the tip body member is processed, the tip body member that is a soft material can be processed while clamping the tip member that is a hard material, that is, the tip body member that is a soft material can be processed, so that the tip body member is processed accurately. be able to.

When the tip member is processed by the forging method before friction welding, regardless of whether the through hole of the electrode wire of the tip body member is processed before or after the friction welding, After friction welding, as shown in FIG.
By performing drilling from the end side of the tip body member to the friction welded portion of the electrode through hole, the electrode wire can be stably fed.

Of course, when the tip member and the tip body member are processed after the friction welding, the processing is more complicated than when the respective members are friction welded. However, when the tip member is swaged, Since the tip member, which is a hard material, can be directly pressed by a die, it is possible to accurately and easily manufacture a through hole that is accurately fitted to a hard wire in the tip member, and at the same time, a tip member that is a hard material. Since the chip body member made of a soft material can be processed on the basis of, the contact chip composed of the chip body member and the tip member can be processed accurately.

In the combination of the respective materials of the tip body member 1 and the tip member 2 shown in Table 1, the combination number; can be used over the years and is the most effective.
That is, the more empty the combination number, the more effective it is.

Further, as shown in FIG. 5, if each of the tip body member 1 and the tip member 2 has a non-circular cross section, the non-circular cross section is chucked during friction welding. If it is supported by 15, 25, the chip body member 1 and the tip member 2 are attached to the chucks 15, 25.
Since they do not slip in the respective rotating directions, friction welding can be performed easily and reliably. The non-circular cross-section has a so-called elliptical or oval shape as shown in FIG. 5A, or a so-called polygon having a triangular or octagonal shape as shown in FIG. 5B. It may have a shape, preferably a hexagonal shape to an octagonal shape, or may have a circular cross section with parallel surfaces as shown in FIG. 5C.

FIG. 6 is an enlarged view showing a modified example corresponding to the chuck portion of the friction welding apparatus, and FIG. 7 is a side view of FIG. 6, showing the claws 151, 15 of the first and second chucks 15, 25.
2, ... 251, 252, ... Can be expanded and contracted in the radial direction like a chuck of a so-called machine tool. In addition, a through hole in the X direction is provided in the shaft center portion of the second chuck 25, and the movable member 26 is movably arranged in this through hole. The movable member 26 is linearly moved in the X ₁ and X ₂ directions by a known linear movement mechanism 27. For example, by using a so-called fluid pressure cylinder such as hydraulic pressure or compressed air, or by using a fluid pressure rotary machine or an electric motor,
It is linearly driven by a so-called rack-pinion mechanism or ball-screw mechanism.

6 and 7, the tip member 2, which is fixed in the long axis direction, that is, the X ₁ direction at the time of friction welding, is loosely or firmly supported by the first chuck 15 in the radial direction. On the other hand, the chip body member 1 is
In order to be movable in the X direction by the second chuck 25,
Radially supported loosely. In this state, the linear motion mechanism 27
While pressing the respective end portions of the tip body member 1 and the tip member 2 via the movable member 26, the first and second chucks 15 and 25 are relatively rotated to, for example, the first chuck. Friction welding is performed by rotating 15. By the way, the first and second chucks 15, 25
The outer shapes of the tip body member 1 and the tip member 2 supported by the respective claws 151, 152, 251, 252, ...
Since the respective cross-sections are non-circular, the tip body member 1 and the tip member 2 are reliably rotated relatively while being supported by the first and second chucks 15 and 25 without slipping.

Although the form of friction welding has been described above, preferably, in FIG. 6, after the rotation of the first chuck 15 is stopped, the pressing force of the tip body member 1 and the tip member 2 before the rotation is stopped. If the linear motion mechanism 27 is driven so as to be larger than the pressing force, a good friction welding result can be obtained. After the friction welding, the movable member 26 is retracted in the X ₂ direction by the linear motion mechanism 27, the first and second chucks 15 and 25 are expanded in the radial direction, and the friction welded contact tip 3 is taken out. It

As described above, if the movable member 26 is moved in the X direction by the linear motion mechanism 27, the mechanism for moving the workpiece in the X direction is simple and the parts to be moved are Since the component 1 or 2 constituting one of the contact chips and the movable member 26 are lightweight components, the driving force of the linear motion mechanism 27 can be small. Therefore, the friction welding device can be manufactured at a very low cost, and the contact tip 3 can be manufactured at a low cost. Of course, in the above, the movable member 26 and the linear motion mechanism 27
Is advantageous in that it is simple in structure and assembly if it is provided on the chuck side that is not rotated during friction welding.

Despite this, the movable member 26 and the linear motion mechanism 27 can be provided on the chuck side rotated during friction welding.

Furthermore, the movable member 26 and the base of the chuck 25 can be integrated. In this case, the chuck 25 is moved in the X direction as shown in FIG.

Furthermore, the first and second chucks 1
The number of nails 5 and 25 may be two or more, for example,
As shown in FIGS. 8 (A) to 8 (C), an ellipse or an oval shape, a polygonal shape, or a shape in which a parallel surface is provided in a circular cross section is approximated to the radial direction. It is possible to use two claws 151, 152, 251, 252 which can be freely expanded and contracted.

Incidentally, for example, as shown in FIG. 6, when the diameter of the through hole 101 of the chip body member 1 is as large as possible than the diameter of the wire to be applied, for example, it is twice the diameter of the wire to be applied. In the above case, the tapered hole 105 for guiding the wire can be omitted.

[0052]

As is apparent from the above description, the contact tip for arc welding and the method for manufacturing the same according to the present invention include a tip body member formed of a soft conductive metal and a tip side of the tip body member. , And the respective end portions with the tip member for power supply formed of a hard copper alloy are friction-welded in the direction orthogonal to the long axis of the contact tip, so that the tip body member and the tip member are By friction welding, the tip body member and the tip body member which are securely fixed together and mechanically positioned by the friction welding device and supported by the chucks facing each other are friction welded. Friction welding work between the tip body member and the tip member because the tip body member and the tip body member are integrally fixed coaxially and the friction welding of the tip body member and the tip member is small. In a very short time, that is, quickly performed.

Furthermore, if each of the tip body member and the tip member has a non-circular cross-section outer shape portion, when the non-circular cross-section outer shape portion is supported by the chuck during friction welding, the chuck body is supported by the chuck. Since the tip body member and the tip member do not slip in the rotational direction, friction welding can be performed easily and reliably.

Of course, when performing an arc welding operation using the contact tip for arc welding according to the present invention,
Even if the tip member becomes hot, the adhesion state between the tip body member and the tip member does not change.Therefore, supply power to the electrode wire in a constant state from the beginning to the end of the arc welding work. You can Therefore, uniform welding results can be obtained.

In addition, as described above, the friction welding device is less expensive than other welding devices, and the tip member is made of a hard copper alloy, and the tip body member is the tip member. If it is made of a softer conductive metal, the tip member that feeds power while contacting the electrode wire is a hard copper alloy, so the tip member wears less and uses arc welding contact tips over time. In addition, since the tip portion only needs to be formed in a column shape having a through hole for the electrode wire, the tip member can be relatively easily manufactured even if the hard copper alloy is difficult to process. At the same time, it is the tip body member made of conductive metal that is softer and cheaper than the tip member to perform the processing that has been conventionally required, such as the screw part for attaching to the welding torch and the spanner hooking part. There therefore easily tip body member, and inexpensive to manufacture, thus, it is possible to fabricate an arc welding contact tip quickly and inexpensively as a whole.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the present invention.

FIG. 2 is a partially sectional front view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a partial sectional front view showing a friction welding apparatus suitable for the present invention.

FIG. 5 is a sectional view showing a main part of still another embodiment of the present invention.

FIG. 6 is an enlarged vertical cross-sectional view showing a modified example corresponding to the chuck portion of the friction welding apparatus suitable for the present invention.

FIG. 7 is a side view of FIG.

FIG. 8 is a diagram showing a modification of FIG.

FIG. 9 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip body member 2 Tip member 3 Arc welding contact tip 4 Axial recessed portion 26 Movable member 27 Linear motion mechanism 101 Through hole for consumable electrode wire 201 Through hole for consumable electrode wire

Claims (15)

[Claims] 1. A contact tip for arc welding having a through hole for a consumable electrode in a shaft core, wherein the tip body member is made of a soft conductive metal, and the tip body member is disposed on the tip side of the tip body member. A contact tip for arc welding formed by friction welding the ends of a tip member for power supply formed of a hard copper alloy in a direction orthogonal to the long axis of the contact tip. 2. The tip body member and the tip member are
The contact tip for arc welding according to claim 1, wherein each of the contact tips has an outer shape having a non-circular cross section. 3. The contact tip for arc welding according to claim 1, wherein the tip member is made of chrome copper or a chrome copper alloy. 4. A method of manufacturing a contact tip for arc welding having a through hole for a consumable electrode in a shaft core, wherein the tip body member is made of a soft conductive metal, and the tip body member is disposed on the tip side. Is supported by a pair of chucks facing each other with a tip member for power supply formed of a hard copper alloy, while pressing the respective end portions of the tip body member and the tip member supported by the chuck, A method of manufacturing a contact tip for arc welding, characterized in that the tip body member and the tip member are relatively rotated and friction welding is performed in a direction orthogonal to a long axis of the contact tip. 5. The tip body member and the tip member are
The method for manufacturing a contact tip for arc welding according to claim 4, wherein each of the outer tips has a non-circular cross section. 6. The tip body member and the tip member are relatively pressed with a pressing force larger than that before the stop when the relative rotation of the tip body member and the tip member is stopped during the friction welding. Or the manufacturing method of the contact tip for arc welding as described in 5 above. 7. A pair of chucks for supporting the tip body member and the tip member, at least one of the chucks movably supports the tip body member or the tip member with respect to a claw of the chuck in a longitudinal direction. 7. The method for producing a contact tip for arc welding according to claim 5 or 6. 8. The method of manufacturing a contact tip for arc welding according to claim 4, wherein the tip member is made of chrome copper or a chrome copper alloy. 9. The method for manufacturing a contact tip for arc welding according to claim 4, wherein an axial recess is formed at an end of the tip body member to be friction welded. 10. The indented portion in the axial direction is formed at an end portion of the tip member to be friction-welded.
A method for manufacturing a contact tip for arc welding according to any one of 1. 11. The method of manufacturing a contact tip for arc welding according to claim 4, wherein the tip member is processed by a forging method before friction welding. 12. The method of manufacturing a contact tip for arc welding according to claim 4, wherein the tip body member is processed by a forging method or a cutting method before friction welding. 13. The tip member is processed by a forging method before friction welding, and the tip body member is
The method for manufacturing a contact tip for arc welding according to any one of claims 4 to 11, which is processed by a forging method or a cutting method after performing friction welding. 14. A method of manufacturing a contact tip for arc welding according to claim 4, wherein after the friction welding, drilling from the end side of the tip body member to the friction welded portion of the electrode through hole is performed. . 15. The method of manufacturing a contact tip for arc welding according to claim 4, wherein the tip member and the tip body member are processed after the friction welding.