JP7178611B2 - welding tip - Google Patents

Description

The present invention relates to a welding tip used in consumable electrode arc welding.

A welding tip for supplying a welding current to a welding wire is provided inside a welding torch used in consumable electrode arc welding. The welding tip is provided with a through hole, and the inner peripheral surface of the through hole contacts the welding wire and functions as a power supply point to the welding wire.

For example, Patent Literature 1 discloses a configuration in which a slit is provided by forming a slit in the lower end of a cylindrical welding tip. Also, the upper end and the lower end of the welding tip are formed as conical projections. In this configuration, a pressurizing mechanism including a spring is provided on the upper end side of the welding tip, and by pressurizing the welding tip in the feeding direction of the welding wire, the projection and the conical recess provided on the torch body are compressed. contact, and the lower end of the welding tip is pushed in the axial direction. As a result, the slot is deformed in the axial direction, and the inner peripheral surface of the through hole and the welding wire are reliably brought into contact with each other.

Japanese Patent Publication No. 02-027024

In the conventional configuration disclosed in Patent Document 1, even when the inner peripheral surface of the through hole is worn, the welding wire is in stable contact with the welding tip, so a stable forced power supply mechanism can be realized.

By the way, in arc welding, there are cases where welding is performed by repeatedly feeding the welding wire toward the work, so-called forward feeding, and feeding the welding wire away from the work, so-called reverse feeding.

However, in the conventional configuration disclosed in Patent Document 1, since the welding tip is pressed only in the forward feed direction of the welding wire, there is a possibility that the welding wire cannot be sufficiently gripped during reverse feed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a welding tip capable of stably supplying power to a welding wire regardless of the feeding direction of the welding wire.

In order to achieve the above objects, the welding tip according to the present invention is a cylindrical tip having a first opening through which a welding wire is inserted and a second opening which are vertically spaced apart from each other by a predetermined distance. The chuck includes at least a case, a chuck housed inside the chip case, and a leaf spring housed in a leaf spring housing part provided in an upper part of the chuck, wherein the chuck has a plurality of split chucks that hold the chips. It is arranged along the radial direction of the case, the inner peripheral surface of the chip case is provided with an annular groove along the inner peripheral direction, and the outer peripheral surface of the split chuck is provided with a groove along the outer peripheral direction. By engaging the protrusion with the groove, the chuck is positioned and attached to the chip case, and the leaf spring moves the upper side of the plurality of split chucks to the radius of the chip case. By urging each direction outward, the lower sides of the plurality of split chucks are displaced radially inward of the tip case, and when the welding wire is inserted through the gaps between the plurality of split chucks, A lower inner surface of the split chuck is configured as a feeding point for the welding wire.

According to this configuration, it is possible to stabilize the position of the power supply point and, in turn, the power supply performance to the welding wire, regardless of the feeding direction of the welding wire.

According to the welding tip of the present invention, power feeding performance to the welding wire can be stabilized.

It is a cross-sectional schematic diagram of the welding torch which concerns on one Embodiment of this invention. 1 is an exploded perspective view of a welding tip; FIG. It is a side view of a chuck. It is a perspective view of a split chuck. FIG. 4 is a side view of the first chip case; FIG. 4B is a cross-sectional view taken along line IVB-IVB of FIG. 4A; FIG. 4 is a cross-sectional view of a second chip case; FIG. 4 is a cross-sectional view of an insulating guide; It is a perspective view of a leaf spring. It is a cross-sectional schematic diagram explaining the assembly procedure of a tip for welding. It is a cross-sectional schematic diagram explaining the process following FIG. 8A. FIG. 8B is a schematic cross-sectional view for explaining a step following FIG. 8B;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following description of preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its applicability or its uses.

(embodiment)
[Configuration of Welding Torch]
FIG. 1 shows a schematic cross-sectional view of a welding torch according to this embodiment. For convenience of explanation, only the tip portion of the welding torch 1000 is shown in FIG. 1, and other portions are omitted.

In the following description, the direction in which the first chip case 21 and the second chip case 22 are arranged is defined as the axial direction, the outer peripheral direction of the chip case 20 is defined as the circumferential direction, and the radial direction of the chip case 20 is defined as the radial direction. Each may be called In addition, in the axial direction, the side on which the leaf spring 40 is arranged may be referred to as the upper or upper side, and the opposite side, that is, the side on which the insulating guide 30 is arranged may be referred to as the lower or lower side. In the radial direction, the center side of the chip case 20 may be called the inside, and the outer peripheral side, which is the opposite side, may be called the outside.

As shown in FIG. 1, the welding torch 1000 has a torch body 200, a tip body 300, an orifice 400, an insulating cylinder 500, a welding tip 100 and a nozzle 600. As shown in FIG.

The torch body 200 is a tubular metal part, which accommodates the tip body 300 inside and has an orifice 400 attached to its lower end. An insulating cylinder 500 is attached to the lower side of the torch body 200 , and a nozzle 600 is attached to the torch body 200 via the insulating cylinder 500 . A torch cable (not shown) is connected to the upper side (not shown) of the torch body 200 . A torch cable is a composite cable in which a welding wire 3000 and a gas pipe (not shown) for flowing gas blown onto a workpiece 2000 during arc welding are assembled.

The tip body 300 is a cylindrical metal part, and has a through hole 310 for inserting the welding wire 3000 in the center and a gas passage hole 320 around it. The gas that has passed through the gas pipe is blown from the nozzle 600 toward the workpiece 2000 through the gas passage hole 320 and the openings 330 and 410 provided on the side surfaces of the chip body 300 and orifice 400 .

A cap nut is provided at the lower end of the tip body 300, and a screw thread (not shown) provided on the second tip case 22 is screwed therewith so that the second tip case 22 is attached to the tip body. 300 is attached and fixed.

The welding tip 100 has a chuck 10 , a tip case 20 , a leaf spring 40 and an insulating guide 30 . Also, the chip case 20 is configured by connecting a first chip case 21 and a second chip case 22 . The configuration of the welding tip 100 will be detailed later.

Nozzle 600 is a cylindrical metal part, and accommodates the lower portion of torch body 200, tip body 300, orifice 400, and welding tip 100 therein. A lower end portion of the welding tip 100 is arranged so as to protrude downward from the nozzle 600 . Nozzle 600 protects the parts contained therein from the arc and heat generated during arc welding. Also, the internal space of the nozzle 600 serves as a path for the gas supplied from the torch cable.

Through hole 310 of chip body 300, second opening 22d of second chip case 22 (see FIG. 5), first opening 21d of first chip case 21 (see FIG. 4B), and through hole of insulating guide 30 31 (see FIG. 6), the tip of the welding wire 3000 protrudes from the welding tip 100 and is arranged below the nozzle 600 . When performing actual arc welding, the welding wire 3000 is fed such that the distance between the tip of the welding wire 3000 and the surface of the workpiece 2000 to be welded is within a predetermined range. Although not shown, welding wire 3000 is plated with copper or the like on its surface.

[Structure of Welding Tip]
FIG. 2 shows an exploded perspective view of the welding tip. FIG. 3A shows a side view of the chuck, and FIG. 3B shows a perspective view of the split chuck. FIG. 4A shows a side view of the first chip case, and FIG. 4B shows a cross-sectional view taken along line IVB-IVB of FIG. 4A. 5 shows a cross-sectional view of the second chip case, FIG. 6 shows a cross-sectional view of the insulating guide, and FIG. 7 shows a perspective view of the leaf spring.

As shown in FIGS. 1 and 2, the welding tip 100 has a chuck 10, a tip case 20, a leaf spring 40, and an insulating guide 30. As shown in FIGS. It is configured by arranging two split chucks 11 in the chip case 20 so as to face each other in the radial direction.

The split chuck 11 is a part made of copper or a copper-based alloy. As shown in FIGS. A convex portion 12 is formed to protrude outward in the direction. On the other hand, the inner surface is composed of a plurality of planes with different inclinations.

The inner side surface of the split chuck 11 includes a first surface 11a extending downward along the axial direction from the upper end thereof, a second surface 11b extending radially outward from the lower side of the first surface 11a, and a second surface 11b extending radially outward from the lower side of the first surface 11a. and a third surface 11c extending downward from the radially outer edge of the surface 11b. The third surface 11c is an inclined surface that is inclined radially inward as it goes downward.

The inner surface of the split chuck 11 is composed of a fourth surface 11d extending axially continuously from the lower side of the third surface 11c, and fifth surfaces provided on both sides of the fourth surface 11d. It further has 11e and a sixth face 11f. The fifth surface 11e is inclined at a predetermined angle with respect to the fourth surface 11d and continues to the outer peripheral surface of the split chuck 11. As shown in FIG. The sixth surface 11 f is provided symmetrically with the fifth surface 11 e in a radial cross-sectional view, and is continuous with the outer peripheral surface of the split chuck 11 .

The inner surface of the split chuck 11 includes a seventh surface 11g which is an inclined surface continuous with the lower side of the fourth surface 11d, and an eighth surface continuous with the lower side of the seventh surface 11g and extending along the axial direction. 11h and . The seventh surface 11g is an inclined surface that is inclined radially inward toward the lower side. The lower side of the eighth surface 11 h corresponds to the lower end of the split chuck 11 . In addition, the fifth surface 11e and the sixth surface 11f are continuous with the seventh surface 11g and the eighth surface 11h, respectively, and the lower side of the fifth surface 11e and the lower side of the sixth surface 11f are also divided. It corresponds to the lower end of the chuck 11 .

Moreover, as shown in FIG. 3A, the two split chucks 11 are arranged facing each other with a predetermined gap in the radial direction inside the chip case 20 . A space that constitutes the plate spring accommodating portion 13 is formed in a portion sandwiched between the second surface 11b and the third surface 11c formed on each split chuck 11 .

The interval between the first surfaces 11a provided on the split chuck 11 and opposed to each other is wider than the interval between the fourth surfaces 11d, and the interval between the fourth surfaces 11d is greater than that between the eighth surfaces 11h. wider than the space between them. As will be described later, the welding wire 3000 inserted through the gap between the two split chucks 11 is sandwiched between the eighth surfaces 11h facing each other. In other words, the eighth surfaces 11h provided on the split chucks 11 come into contact with the welding wire 3000 and function as feed points for supplying the welding current to the welding wire 3000. As shown in FIG.

Further, in the gap between the two split chucks 11, the portion where the fifth surface 11e formed on one split chuck 11 and the sixth surface 11f formed on the other split chuck 11 face each other is radially The width in the circumferential direction increases toward the outside.

As shown in FIGS. 1 and 2, the chip case 20 is a component configured by detachably connecting a first chip case 21 and a second chip case 22 disposed thereabove. Its material is the same as that of the split chuck 11 . Also, the chuck 10 described above is positioned and attached inside the chip case 20 .

As shown in FIGS. 4A and 4B, the first chip case 21 has a cylindrical first portion 21a and a cylindrical second portion provided below the first portion 21a. 21b, and a truncated cone-shaped third portion 21c that is continuous with and provided below the second portion 21b. The first portion 21a and the second portion 21b have the same inner diameter, while the outer diameter 21b of the second portion is longer than the outer diameter of the first portion 21a.

A first notch 21g is formed in an annular shape on the inner peripheral side of the upper end surface of the first portion 21a. The first cutout portion 21g has a chamfered shape in an axial cross-sectional view. A screw thread (not shown) is provided on the outer peripheral surface of the first portion 21a, and the first portion 21a is configured as a male screw that is screwed into the second chip case 22, which will be described later.

A side surface of the second portion 21b is provided with two discharge ports 21f that penetrate the second portion 21b in the thickness direction thereof, facing each other in the radial direction. The two discharge ports 21f are provided so as to overlap the gaps between the two split chucks 11 when viewed from the side. Abrasion powder and plating dregs generated near the power supply point during arc welding are discharged from the gap between the two split chucks 11 to the outside of the welding tip 100 through the discharge port 21f.

The third portion 21c has an open bottom surface, and a space for accommodating the insulating guide 30 is provided inside. The second portion 21b and the third portion 21c are partitioned by a partition wall 21e having a first opening 21d through which the welding wire 3000 is inserted. The lower part of the chuck 10, specifically, the part below the projection 12 is accommodated (see FIGS. 1 and 8C).

As shown in FIG. 5, the second chip case 22 includes a cylindrical fourth portion 22a, a cylindrical fifth portion 22b provided continuously below the fourth portion 22a, and The fourth portion 22a has a second opening 22d for inserting the welding wire 3000 in the axial center.

While the fifth portion 22b is continuous with the fourth portion 22a, its outer diameter is longer than the outer diameter of the fourth portion 22a. The internal space of the fifth portion 22b communicates with the second opening 22d provided in the fourth portion 22a. Further, the upper portion of the chuck 10, specifically, the portion above the convex portion 12 and the plate spring 40 are accommodated in the internal space of the fifth portion 22b (see FIGS. 1 and 8C). A thread (not shown) is provided on the outer peripheral surface of the fourth portion 22a, and is screwed to the lower end portion of the tip body 300, which is a cap nut.

The sixth portion 22c is continuous with the fifth portion 22b and has an outer diameter equal to that of the fifth portion 22b and an inner diameter longer than that of the fifth portion 22b. Also, the lower surface of the sixth portion 22c is open. A tapered portion 22e is formed between the inner peripheral surface of the fifth portion 22b and the inner peripheral surface of the sixth portion 22c.

The inner diameter of the fifth portion 22b is approximately the same length as the inner diameters of the first and second portions 21a and 21b provided in the first chip case 21. As shown in FIG. Also, the inner diameter of the sixth portion 22c is approximately the same length as the outer diameter of the first portion 21a.

In the specification of the present application, "substantially the same" or "substantially the same" means that each part to be compared including the manufacturing tolerance and assembly tolerance of each part constituting the welding tip 100 is the same or the same. and does not mean that each part is strictly the same or identical.

A screw thread (not shown) is formed on the inner peripheral surface of the sixth portion 22c, and the sixth portion 22c constitutes a cap nut. The first portion 21a of the first chip case 21, which is a male screw, is screwed into the cap nut, and the first chip case 21 and the second chip case 22 are fastened and fixed to each other.

The tapered portion 22e is provided to form an annular ring on the inner peripheral surface of the second chip case 22, and is continuous with the inner peripheral surface of the fifth portion 22b and the inner peripheral surface of the sixth portion 22c. . The tapered portion 22e has a chamfered shape in an axial cross-sectional view. That is, the surface is inclined with respect to the axial direction. Further, the inner periphery of the lower end surface of the second chip case 22 is chamfered to form a second notch 22f in an annular shape. The second notch 22f is provided to facilitate insertion of the second chip case 22 into the first chip case 21. As shown in FIG.

As shown in FIG. 6, the insulating guide 30 is made of insulating ceramics and is a component having a through hole 31 for inserting the welding wire 3000 in the axial center. It is accommodated inside the portion 21c of 3. The insulating guide 30 is provided to protect the chuck 10 and leaf spring 40 from spatter and the like generated during arc welding. Moreover, it prevents the welding wire 3000 from being supplied with power from the chuck 10 at a place other than the original power supply point due to adhesion of the spatter.

As shown in FIG. 7, the leaf spring 40 is formed by bending a flat metal member into a V shape, and a third opening 41 is formed in the center thereof for allowing the welding wire 3000 to pass therethrough. The leaf spring 40 is formed using a material having higher heat resistance than the copper or copper-based alloy that constitutes the chuck 10 and the chip case 20, and the material of the leaf spring 40 in this embodiment is Inconel. However, it is not particularly limited to this.

Note that the first opening 21d provided in the first chip case 21, the second opening 22d provided in the second chip case 22, the through hole 31 provided in the insulating guide 30, and the leaf spring 40 are provided with The third openings 41 are each longer in diameter or radial dimension than the diameter of the welding wire 3000 . This allows the welding wire 3000 to move easily in the axial direction. Similarly, the diameter of through hole 310 provided in tip body 300 is also longer than the diameter of welding wire 3000 .

A welding wire 3000 is inserted into the welding tip 100 configured as described above, and a wire feed mechanism (not shown) repeats forward and reverse feeding to arc the workpiece 2000 (see FIG. 1). Welding is done.

[Assembly procedure for welding tips]
8A to 8C show cross-sectional schematic diagrams for explaining the procedure for assembling the welding tip. For convenience of explanation, only part of the first chip case 21 and the second chip case 22 are shown in FIGS. 8A to 8C.

As shown in FIG. 8A, first, two split chucks 11 are prepared and arranged in the first chip case 21 so as to face each other in the radial direction. At this time, the two split chucks 11 are attached to the first chip case 21 so that the projections 12 provided on the split chucks 11 come into contact with the first notch portions 21g provided on the first chip case 21 . Place inside. A leaf spring 40 is accommodated in a leaf spring accommodation portion 13 provided between the two split chucks 11 .

At this point, the chuck 10 is pushed downward and pressed against the first chip case 21 . Further, the upper sides of the split chucks 11 in which the leaf springs 40 are sandwiched are pushed radially inward, and the leaf springs 40 are contracted. As shown in FIG. 8A, the outer diameter of the chuck 10 is larger than the inner diameter of the first and second portions 21a and 21b of the first chip case 21 when the projection 12 is in contact with the first notch 21g. is set to be shorter. Therefore, the outer peripheral surface of the chuck 10 and the inner peripheral surfaces of the first and second portions 21a and 21b are arranged with a predetermined gap in the radial direction. The inner diameters of the first and second portions 21 a and 21 b of the first tip case 21 and the inner diameter of the fifth portion 22 b of the second tip case 22 correspond to the inner diameter of the tip case 20 .

Next, as shown in FIG. 8B, when the load applied radially inward to each of the split chucks 11 is released while the chuck 10 is pushed downward, the restoring force of the plate spring 40 causes the split chucks 11 to split. The upper side of each chuck 11 is biased to open radially outward. At this time, the split chucks 11 are tilted so that the lower sides of the split chucks 11 are displaced radially inward and closer to each other, with the protrusions 12 in contact with the first cutouts 21g as fulcrums. As a result, the distance between the eighth surfaces 11h provided on each of the split chucks 11 is reduced.

As shown in FIG. 8C, the second chip case 22 is attached to the first chip case 21 . Specifically, the sixth portion 22c of the second tip case 22 forming a cap nut is screwed into the first portion 21a of the first tip case 21 forming a male screw to form the first tip. Case 21 and second chip case 22 are connected. At this time, the first portion 21a of the first chip case 21 is accommodated in the sixth portion 22c of the second chip case 22, and the first and second portions 21a and 21a of the first chip case 21 are accommodated. The chuck 10 and the leaf spring 40 are accommodated in the internal space of 21 b and the internal space of the fifth portion 22 b of the second chip case 22 .

In addition, the first cutout portion 21g provided in the first chip case 21 and the tapered portion 22e provided in the second chip case 22 are arranged to face each other in the axial direction, so that the chip case 20 A groove portion 23 is provided on the inner peripheral surface of , specifically, the inner peripheral surface of the connecting portion between the first chip case 21 and the second chip case 22 . The chuck 10 is positioned and attached to the chip case 20 by engaging the protrusions 12 provided on the outer peripheral surface of the chuck 10 with the grooves 23 .

In addition, in the state shown in FIG. 8C, each of the split chucks 11 is biased by the leaf spring 40, so that the upper side opens radially outward with the convex portion 12 engaged with the groove portion 23 as a fulcrum, The lower side is pushed radially inward.

Note that the size of the groove 23 is set to be slightly larger than the size of the projection 12 . In particular, the axial width of the groove 23 is wider than that of the protrusion 12 . Therefore, the convex portion 12 can be displaced inside the groove portion 23 . Thus, in the state shown in FIG. 8C, the chuck 10 can be tilted within a predetermined range with the protrusions 12 engaged with the grooves 23 of the chip case 20 .

After welding tip 100 assembled in this way is further incorporated into welding torch 1000 , welding wire 3000 is inserted through through hole 310 of tip body 300 and inside welding tip 100 .

By opening the upper side of each split chuck 11 radially outward, the gap above the chuck 10 is set to be reliably wider than the diameter of the welding wire 3000 . On the other hand, since the lower sides of the split chucks 11 are moved radially inward and displaced, the gap between the lower sides of the chucks 10, specifically the gap between the eighth surfaces 11h, is the diameter of the welding wire 3000. set to be slightly narrower than

Therefore, the welding wire 3000 fed from the upper side of the welding tip 100 passes through the second opening 22d of the second tip case 22 and the third opening 41 provided in the plate spring 40 to reach two It is inserted into the gap of the split chuck 11 . At this time, since the gap above the two split chucks 11 is pushed and widened, the welding wire 3000 can easily pass through.

When the welding wire 3000 is fed further downward, it contacts the eighth surface 11h provided on each of the split chucks 11, and further reaches the first opening 21d of the first chip case 21 and the through hole of the insulating guide 30. 31, the tip of the welding wire 3000 protrudes from the welding tip 100 and is arranged below it.

In addition, when the welding wire 3000 passes between the eighth surfaces 11 h provided on each of the split chucks 11 , the lower side of the chuck 10 is pushed outward slightly in the radial direction, but the restoring force of the leaf spring 40 As a result, the welding wire 3000 tends to return to its original position immediately, so that the welding wire 3000 is securely clamped by the eighth surface 11h of the split chuck 11 .

When the welding tip 100 is to be disassembled for maintenance such as internal cleaning or parts replacement, the procedure described above may be reversed. For example, the second chip case 22 is removed from the first chip case 21 , the chuck 10 is taken out from the first chip case 21 , the leaf spring 40 is removed, and the chucks 11 are divided into two. After that, inspect and clean each individual part, and replace the part if necessary.

[Effects, etc.]
As described above, the welding tip 100 according to the present embodiment has a cylindrical shape in which the first opening 21d and the second opening 22d through which the welding wire 3000 is inserted are provided with a predetermined gap in the vertical direction. a chip case 20, a chuck 10 housed inside the chip case 20, and a leaf spring 40 housed in a leaf spring housing portion 13 provided above the chuck 10.

The chuck 10 is configured by arranging two split chucks 11 facing each other in the radial direction of the chip case 20 .

An annular groove 23 is provided in the inner peripheral surface of the chip case 20 along the inner peripheral direction. In addition, a convex portion 12 is provided on the outer peripheral surface of the split chuck 11 along the outer peripheral direction. The chuck 10 is positioned and attached to the chip case 20 by engaging the convex portion 12 with the groove portion 23 .

The leaf springs 40 housed in the leaf spring housing portion 13 bias the upper sides of the two split chucks 11 radially outward of the chip case 20 . , and when the welding wire 3000 is inserted through the gap between the two split chucks 11, the eighth surface 11h, which is the lower inner surface of the split chuck 11, is the feeding point to the welding wire 3000. configured as

By configuring welding tip 100 in this way, it is possible to stabilize the position of the power supply point and, in turn, the power supply performance to welding wire 3000 regardless of the feeding direction of welding wire 3000 .

For example, in the conventional configuration disclosed in Patent Document 1, by pressing the welding tip in the forward feed direction of the welding wire, the slot provided at the tip of the welding tip deforms in the axial direction. to ensure contact between the inner peripheral surface of the through hole and the welding wire. As a result, even when the inner peripheral surface of the through hole is worn, power can be stably supplied to the welding wire without changing the position of the power supply point.

However, in the above case, since the welding tip is pressurized only in the forward feed direction of the welding wire, the feed resistance applied to the welding wire differs between when the welding wire is forwardly fed and when it is reversely fed. Therefore, there is a possibility that the state of contact between the welding wire and the welding tip may change between normal feed and reverse feed. In addition, the contact position of the welding tip with the welding wire, that is, the position of the feeding point may also change. If such a thing occurs, the power feeding performance to the welding wire may not be stable, and good arc welding may not be performed.

On the other hand, according to the present embodiment, the leaf spring 40 urges the upper sides of the two split chucks 11 radially outward, so that the protrusions 12 engaged with the grooves 23 are used as fulcrums to create two chucks. The welding wire 3000 is gripped by the two split chucks 11 so that the lower sides of the split chucks 11 are moved radially inward.

Also, while the split chuck 11 is radially biased by the leaf spring 40, the welding wire 3000 moves axially. Therefore, the feeding resistance applied to the welding wire 3000 does not change much between forward feeding and reverse feeding of the welding wire 3000, and the state of contact between the welding wire 3000 and the welding tip 100, and thus the position of the feeding point, is changed. can be stabilized. As a result, power feeding performance to the welding wire 3000 is stabilized, and good arc welding can be performed.

The chip case 20 is detachably connected to a cylindrical first chip case 21 having a first opening 21d and a cylindrical second chip case 22 having a second opening 22d. A groove portion 23 is provided on the inner peripheral surface of the connecting portion between the first chip case 21 and the second chip case 22 .

By configuring the chip case 20 in this way, the chuck 10 and the leaf spring 40 accommodated inside the chip case 20 can be easily taken out. Further, the chuck 10 taken out from the chip case 20 can be easily divided into two split chucks 11 by removing the plate spring 40 . This facilitates cleaning and replacement of individual parts. That is, the welding tip 100 with improved maintainability can be realized.

Further, since the groove 23 is provided on the inner peripheral surface of the connecting portion between the first chip case 21 and the second chip case 22, the axial position of the chuck 10 within the chip case 20 is automatically determined. As a result, the position of the eighth surface 11h of the split chuck 11, which is the feeding point, can be easily determined in the axial direction, and the welding wire 3000 can be stably fed.

On the side surface of the first tip case 21, there are two discharge ports 21f that pass through the first tip case 21 in its thickness direction and discharge abrasion powder and plating dregs generated in the vicinity of the power supply point during welding to the outside. They are provided so as to face each other in the radial direction.

By forming the discharge port 21 f in this way, it is possible to easily discharge abrasion powder and plating dregs to the outside of the welding tip 100 and prevent them from accumulating in the gap between the two split chucks 11 . As a result, the maintenance frequency of the welding tip 100 can be reduced, and the welding cost can be reduced.

In addition, if a predetermined amount or more of abrasion powder or plating dregs accumulates in the gap between the two split chucks 11, the force with which the chuck 10 grips the welding wire 3000 weakens, and there is a risk that power supply performance to the welding wire 3000 will become unstable.

On the other hand, according to the present embodiment, by providing the discharge port 21f in the first tip case 21 in which the power supply point is accommodated, abrasion powder and plating dregs are discharged to the outside of the welding tip 100, and the chuck 10 performs welding. It is possible to suppress weakening of the force for gripping the wire 3000 . As a result, power feeding performance to the welding wire 3000 is stabilized, and good arc welding can be performed.

The discharge port 21f is preferably provided so as to overlap the gap between the two split chucks 11 in a side view. Moreover, it is more preferable that the width of the gap between the two split chucks 11 in the circumferential direction increases toward the radially outer side.

By doing so, abrasion powder and plating dregs can be efficiently discharged to the outside of the welding tip 100 .

An insulating guide 30 having a through-hole 31 through which a welding wire 3000 passes is attached inside the first chip case 21 .

By providing the insulating guide 30, the chuck 10 and the leaf spring 40 can be protected from spatter generated during arc welding, and power can be prevented from being supplied from the chuck 10 to the welding wire 3000 at a place other than the original power supply point.

Further, the plate spring 40 is provided with a third opening 41 through which the welding wire 3000 passes. The leaf spring 40 is preferably made of a material having higher heat resistance than the material of the chuck 10 .

By providing the third opening 41 in the leaf spring 40, the welding wire 3000 can pass through while urging the two split chucks 11 radially outward.

Further, by using a highly heat-resistant material for the leaf spring 40, deformation of the leaf spring 40 due to heat generated during arc welding can be suppressed. The arc generated between the tip of the welding wire 3000 and the surface of the workpiece 2000 has a very high temperature, and part of it is propagated to the chuck 10 by radiation or heat conduction. Moreover, it is also propagated to the leaf spring 40 through the gap between the two split chucks 11 . Since the leaf spring 40 has a smaller volume and a much thinner thickness than the split chuck 11, if the leaf spring 40 has the same heat resistance as the chuck, it may be deformed by the arc heat. There is If such deformation occurs, the biasing force with which the leaf spring 40 biases the chuck 10 is weakened, and as a result, there is a risk that the power feeding performance to the welding wire 3000 will become unstable.

On the other hand, according to the present embodiment, by setting the heat resistance of the leaf spring 40 as described above, it is possible to suppress deformation due to arc heat and, in turn, decrease in the biasing force of the leaf spring 40 biasing the chuck 10 . As a result, power feeding performance to the welding wire 3000 is stabilized, and good arc welding can be performed.

(Other embodiments)
In the above-described embodiment, the welding wire 3000 repeats forward feeding and reverse feeding, but the feeding direction of the welding wire 3000 may be only forward feeding. Also in this case, the welding tip 100 and the welding torch 1000 disclosed in this specification can be applied.

Alternatively, the chuck 10 may be configured by arranging three or more split chucks 11 in the chip case 20 along the radial direction. In this case, similarly to the embodiment, the plate springs 40 urge the upper sides of the plurality of split chucks 11 radially outward, so that the lower sides of the plurality of split chucks 11 are displaced radially inward. When the welding wire 3000 is inserted into the gap 11 , the lower inner surface of the split chuck 11 is configured as a feeding point to the welding wire 3000 . Further, in this case, the leaf spring 40 may be provided with the third opening 41 by, for example, bending a disc-shaped plate material into a conical shape and removing the tip thereof. The smaller the number of split chucks 11, the easier the assembly, disassembly, and maintenance of the welding tip 100 becomes.

Also, the connection structure between the first chip case 21 and the second chip case 22 is not limited to that shown in the embodiment. For example, a through hole (not shown) is provided in the side surface of the first portion 21a of the first chip case 21 and the side surface of the sixth portion 22c of the second chip case 22, and a screw or the like (not shown) is inserted. Then, the first chip case 21 and the second chip case 22 may be connected.

INDUSTRIAL APPLICABILITY The welding tip of the present invention can stabilize power feeding performance to the welding wire regardless of the feeding direction of the welding wire, and is therefore useful for application to arc welding apparatuses that perform arc welding by various methods.

10 chuck 11 divided chucks 11a to 11h first to eighth surfaces 12 projections 13 leaf spring accommodating portion 20 chip case 21 first chip cases 21a to 21c first to third portions 21d first opening 21f discharge port 21g first notch 22 second chip case 22a to 22c fourth to sixth portions 22d second opening 22e tapered portion 23 groove 30 insulating guide 31 through hole 40 leaf spring 41 third opening 200 torch body 300 tip body 400 orifice 500 insulating cylinder 600 nozzle 1000 welding torch 2000 workpiece 3000 welding wire

Claims (7)

a cylindrical tip case in which a first opening and a second opening through which the welding wire is inserted are provided with a predetermined spacing in the vertical direction;
a chuck housed inside the chip case;
at least a leaf spring accommodated in a leaf spring accommodation portion provided at the top of the chuck,
The chuck is configured by arranging a plurality of split chucks along the radial direction of the chip case,
An annular groove is provided in the inner peripheral surface of the chip case along the inner peripheral direction,
A convex portion is provided along the outer peripheral direction on the outer peripheral surface of the split chuck,
By engaging the protrusion with the groove, the chuck is positioned and attached to the chip case,
The leaf spring biases the upper sides of the plurality of split chucks toward the radially outer side of the chip case, thereby displacing the lower sides of the plurality of split chucks radially inwardly of the chip case,
A welding tip, wherein when the welding wire is inserted through the gaps of the plurality of split chucks, a lower inner surface of the split chuck is configured as a feeding point for the welding wire. The welding tip of claim 1, wherein
The chip case is formed by detachably connecting a cylindrical first chip case provided with the first opening and a cylindrical second chip case provided with the second opening. ,
A welding tip, wherein the groove is provided on an inner peripheral surface of a connecting portion between the first tip case and the second tip case. The welding tip according to claim 2,
On the side surface of the first tip case, there is at least a discharge port that penetrates the first tip case in its thickness direction and discharges abrasion powder and plating dregs generated in the vicinity of the power supply point during welding to the outside. Welding tips, characterized in that there is one. The welding tip according to claim 3,
The welding tip, wherein the discharge port is provided so as to overlap the gaps of the plurality of split chucks in a side view. The welding tip according to any one of claims 2 to 4,
A welding tip, wherein an insulating guide having a through hole for passing the welding wire is attached to the inside of the first tip case. The welding tip according to any one of claims 1 to 5,
A welding tip, wherein the leaf spring is provided with a third opening through which the welding wire passes. The welding tip according to any one of claims 1 to 6,
A welding tip, wherein the plate spring is made of a material having higher heat resistance than the material of the chuck.

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