WO1996026034A1

WO1996026034A1 - Welding tip

Info

Publication number: WO1996026034A1
Application number: PCT/JP1995/000245
Authority: WO
Inventors: Masaru Nagamine
Original assignee: Nagamine Manufacturing Co., Ltd.
Priority date: 1993-09-30
Filing date: 1995-02-20
Publication date: 1996-08-29

Abstract

A welding tip comprising a tip main body (1) comprising in turn a leading end portion (11) and a rear end portion (21), and a C-shaped spring (3), wherein a welding rod passage hole (6) is formed in an axially central portion of the tip main body (1), wherein a longitudinal slit (13) is formed in the leading end portion (11) of the tip main body (1) in such a manner as to extend along the welding rod passage hole (6) from a leading end (12), wherein an annular groove (16) is formed within a range where the longitudinal slit (13) is formed, and wherein the C-shaped spring (3) is fitted in the annular groove (16) so as to clamp the longitudinal slit (13). Even if the welding rod passage hole (6) is enlarged due to wear, there remains good contact between a welding rod and the welding rod passage hole (6) so as to supply stable current, and moreover a leading end of a welding rod can stably be fixed so as to effect accurate welding, thereby making it possible to improve the welding quality.

Description

Harm

For chips

Technical field

The present invention relates to a chip for a chip. More specifically, it relates to a welding tip suitable for a robot or the like.

Background art

In a conventional welding tip, a passage hole for a welding rod is formed at the center of the tip, and the welding rod force is passed through the hole. If the rod is used for a long time, the area around the rod passage hole will wear and the passage hole will expand.

By the way, when using the welding tip in which the conventional rod passage hole is enlarged due to wear, there are the following problems.

In other words, a poor contact force <between the welding rod and the passage hole for the welding rod is generated, so that the current flow force becomes unstable and the quality of the welding deteriorates. Chips cannot be used.

Also, when the passage hole for the welding rod expands due to wear, the small hole formed at the tip of the tip is also usually enlarged. Since it is difficult to abut the rod at a desired position, when the welding rod is moved in an elliptical shape by a welding robot or the like, the quality of welding may be deteriorated, particularly.

In view of such circumstances, the present invention provides good contact between a welding rod and a welding rod passage hole and stable current even when the welding rod passage hole is enlarged due to wear. An object of the present invention is to provide a welding tip capable of stably fixing the tip of the welding tip, thereby performing accurate welding and improving welding quality.

Disclosure of the invention

A welding tip according to the present invention comprises a tip body having a front end and a rear end and a c-shaped panel, and a welding tip having a passage hole for a welding rod formed at an axial center of the tip body. Wherein a longitudinal slitting force is formed at a tip end of the tip body and extends from the tip end along the passageway for the welding rod, and the longitudinal slitting force is formed on an outer periphery of the tip end. An annular groove is formed within the range, and the c-shaped It is characterized in that it is fitted into the annular groove so as to tighten the vertical slit.

In the welding tip of the present invention, the vertical slit is tightened by the c-shaped panel fitted in the annular groove, so that the welding passing through the welding rod passage hole at the portion where the vertical slit is formed. Since the rod is constantly tightened, the inner diameter of the welding rod passage hole can be maintained substantially the same as the outer diameter of the welding rod even if the inner diameter of the welding rod passage hole increases due to wear. The contact force is always good and the current supply is stable, and the tip of the welding rod is stably fixed. Therefore, accurate welding is possible and the welding quality is improved.

Brief description of

FIG. 1 is a perspective view of a welding tip A according to a first embodiment of the present invention, FIG. 2 is a plan view of the welding tip A, FIG. 3 is a front view of the welding tip A, and FIG. FIG. 5 is a perspective view of a C-shaped panel, FIG. 6 is a plan view of a welding tip B according to a second embodiment of the present invention, FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6, FIG. Is a plan view of a welding tip C according to the third embodiment of the present invention, FIG. 9 is a sectional view taken along the line IX-VIII in FIG. 8, and FIG. 10 is a sectional view of a welding tip D according to the fourth embodiment of the present invention. FIG. 11 is a plan view of the annular groove 16 and the C-shaped spring 3, and FIG. 11 is a front view of the welding tip D of the embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)

FIG. 1 is a perspective view of a welding tip A according to a first embodiment of the present invention. This welding tip A is composed of a tip body 1 and a C-shaped panel 3.

As shown in FIGS. 1 and 3, the chip body 1 is a substantially cylindrical member, and is composed of a front end 11 and a rear end 21. The rod passage hole 6 penetrates. The leading end of the welding rod passage hole 6 is a small hole 17 formed at the center of the leading end 12 of the leading end 11.

The tip 11 of the tip body 1 is a vertically long frustoconical member, and a vertical slit 13 extending from the tip 12 across the welding rod passage hole 6 and extending along the same is formed near the bottom of the frustoconical member. Have been. That is, vertical slotting 13 is a circle as shown in Figs. The frustoconical member is formed so as to be divided into two parts in the diameter direction from the tip 12 of the frustum-shaped member to the vicinity of the bottom surface. In this embodiment, the force of the vertical slit 13 having a width X of 0.4 mni is set, and the magnitude thereof can be freely set.

In addition, a horizontal slot 14 is formed slightly above the end of the vertical slot 13.o This horizontal slot 14 is closer to the end of the vertical slot 13 as shown in Figs. As shown in FIG. 4, semi-disc-shaped notches formed at right angles to the vertical slit 13 on both sides of the vertical slit 13 slightly above. In this embodiment, the width y of the horizontal slit 14 is 0.4 mm, but the size can be freely set. Further, in the present embodiment, the force formed at the horizontal slit 14 slightly above the end of the vertical slit 13 and the position thereof can be set freely. However, considering that the horizontal slit 14 is formed so that the vertical slit 13 can be easily tightened with a C-shaped panel described later, as shown in the present embodiment, the horizontal slit 14 is slightly longer than the end of the vertical slit 13. Preferably, it is formed above. It should be noted that the horizontal slit 14 is not always necessary, but is preferably formed as in the present embodiment in order to make the vertical slit 13 function effectively.

Further, an annular groove 16 is formed on the outer periphery of the tip body 1 near the tip of the tip 11 thereof. In the present embodiment, the force at which the annular groove 16 is formed in the vicinity of the tip of the tip end portion 11 of the chip body 1 The position at which the annular groove 16 is formed can be freely set within the range where the vertical slit 13 force is formed. As will be described later, considering that a C-shaped panel for tightening the vertical slot 13 is fitted into the annular groove 16, in order to effectively tighten the vertical slot 13, It is preferable to form an annular groove 16 near the tip of the tip portion 11 of the chip body 1 as in this embodiment.

Note that, as in the present embodiment, the annular groove 16 is formed slightly above the end of the vertical slit 13 when the groove 14 is formed. do it.

As shown in FIGS. 1 and 3, the rear end 21 of the tip body 1 is provided with a screw portion 23 connected to a welding machine (not shown). Passage hole 6 for rod passes through.

As shown in FIG. 5, the C-shaped panel 3 is a C-shaped leaf spring made of heat-resistant panel steel. Then, as shown in FIGS. 1 and 3, the C-shaped spring 3 is Since it is fitted and serves to tighten the vertical slit 13, the inner diameter of the C-shaped spring 3 is formed slightly smaller than the outer diameter of the annular groove 16, and is fitted into the annular groove 16. That is, in the present embodiment, the inner diameter of the C-shaped panel 3 is set to 2.5 mm while the outer diameter of the annular groove 16 is set to 3 mm, but the size can be freely set. In addition, the thickness of the C-shaped panel 3 can be freely set according to the width of the annular groove 16. In the present example, the width of the annular groove 16 is l min, and the thickness of the C-shaped spring 3 is 0. 5 咖

In this example, as the C-shaped panel 3, a panel panel made of heat-resistant panel steel is used. Any shape may be used as long as it can be fitted into the annular groove 16 and the vertical slot 13 can be tightened. A material made of a memory alloy can be used. When the shape memory alloy is used as the material, the C-shaped panel 3 is formed so that the inner diameter is slightly smaller than the outer diameter of the annular groove 16 at about 500 ambient temperatures, and is fitted into the annular groove 16 at room temperature. Have been combined. The thickness of the C-shaped panel 3 may be the same as that of the panel panel.

Next, the operation of the welding tip A of the present embodiment will be described.

Since the C-shaped spring 3 having an inner diameter slightly smaller than the outer diameter of the annular groove 16 is fitted into the annular groove 16 of the welding tip A, the distal end 11 of the tip body 1 passes through the welding rod passage hole 6. The welding rod (not shown) protruding from the small hole 17 formed at the tip 12 of the steel is tightened by the C-shaped spring 3 within the range where the vertical slit 13 is formed.

Also, in the case of C-shaped panel 3 made of a shape memory alloy, since the ambient temperature of C-shaped panel 3 reaches approximately 500 ° C during welding, the inner diameter of C-shaped panel 3 is the same as that of the original shape during welding. The welding rod projecting from the small hole 17 at the tip 12 of the tip part 11 of the tip body 1 through the welding rod passage hole 6 within the range where the vertical slit 13 was formed during welding 13 Memory shape base metal C-shaped spring Tightened by 3

As described above, when the welding tip A of the present embodiment is used, the welding rod in the range where the vertical slot 13 is formed is tightened by the vertical slot 13 and closely adheres to the welding rod passage hole 6. In this state, even if the inner diameter of the welding rod passage hole 6 increases due to wear, the inner diameter can be maintained substantially the same as the outer diameter of the welding rod. Therefore, the contact between the welding rod and the passage hole 6 for the welding rod becomes good, and the current is supplied stably, so that the quality of the welded portion can be improved. In addition, since the tip of the welding rod protruding from the small hole 17 of the tip 12 of the tip part 11 of the tip body 1 is stable, the tip of the rod can abut on a desired position. And the quality of welding can be improved.

(Second embodiment)

In the second embodiment of the present invention, as shown in FIGS. 6 to 6, a cap 4 is attached to a tip 11 of a chip body 1.

The cap 4 is a frustoconical cylinder similar to the tip 11 of the chip body 1 and is formed of a copper plate. The tip is closed with a lid 41 formed with a small force 42 larger than the small hole 17 formed in the tip 12 of the tip part 11 of the tip body 1 of the tip body 1, and the end is locked inwardly bent. 43 pieces are formed. Note that the inner surface shape of the cap 4 is substantially the same as the outer shape of the tip end portion 11 of the chip body 1 in a state where the annular groove 16 and the horizontal slit 14 are not formed.

Therefore, when the cap 4 is put on the tip 11 of the chip body 1 and the locking piece 43 is locked on the outer periphery of the bottom surface of the tip 11, the cap 4 can be securely attached to the tip 11. If the tip B of the tip body 1 is covered with the welding tip B with the cap 4 covered, the spuck splatters and can be easily removed even if it adheres around the small hole 42 of the lid 41 of the cap 4. Note that the bottom of the cap 4 may be welded to the tip 11 of the chip body 1 and fixed without using the locking piece 43.

In this embodiment, even if the spatter is scattered during the gas arc welding fusing, it does not adhere around the small hole 17 at the tip 12 of the welding tip A. There is no danger that the operation will not be reduced unless the small hole 17 is sent out smoothly from the small hole 17.

Although a copper plate is used as the material of the cap 4, it is more preferable to use a tetrafluorochemical styrene resin or a zinc plated copper plate. Since the tetrafluorochemical resin and the plated copper plate are very hard to adhere to the spatter, they are remarkably effective in preventing spatter adhesion. Also, a cap 4 whose surface has been subjected to evening flaming can be used. Tufram treatment is a treatment in which a hard anodic oxide film is formed on the aluminum surface using a sulfuric acid bath, and the porous layer of this film is impregnated with an aqueous dispersion of a fluorocarbon polymer of 2 m or less. Make metal surfaces very slippery Can be.

As described above, when the tip B with the cap 4 of the present embodiment is used, in addition to the effect of the first embodiment, the spatter is hardly attached around the small hole 42 of the lid 41 of the cap 4. Even if it adheres, it can be easily removed, thus improving the efficiency of the welding operation.

(Third embodiment)

In the third embodiment of the present invention, as shown in FIGS. 8 to 9, the protector 5 is joined to the tip 12 of the tip 11 of the chip body 1, and the cap 4 is mounted thereon. The protector 5 is a ceramic disk having a small hole 51 formed in the center, the inner diameter of the small hole 51 is almost the same as the inner diameter of the passage hole 6 for the welding rod, and the outer diameter of the protector 5 is a chip. The outer diameter of the distal end 12 of the distal end portion 11 of the pump body 1 is formed to be substantially the same as the outer diameter. In this example, the thickness of the protector 5 is 1.5 mm, but the dimensions can be set freely. If the inside diameter of the small hole 51 is almost the same as the inside diameter of the passage hole 6 for the welding rod, the outside diameter of the protector 5 can be set freely. In view of joining to the front end 12 of the first front end 11 and mounting the cap 4 thereon, it is preferable to form as in the present embodiment.

In the present embodiment, ceramics is used as the material of the protector 5, but any material having wear resistance may be used, and for example, a cemented carbide may be used. The wear-resistant material referred to in this specification harm refers to a material having high wear resistance such as ceramics and cemented carbide.

The cap 4 is substantially the same as that of the first embodiment, except that the length is longer by the thickness of the protector 5. Note that the protector 5 is only required to be joined to the tip 12 of the tip 11 of the chip body 1 and the cap 4 is not always necessary.However, from the viewpoint of complete fixing of the protector 5 to the chip body 1 and prevention of adhesion of spatter, etc. Therefore, it is preferable to attach the cap 4 as in this embodiment.

In the robot machine, welding is performed while rotating the welding rod.Therefore, the tip of the tip part 11 of the tip body 1 tends to wear unevenly in the diameter direction where the vertical slit 13 is formed. Entering inside the vertical slit 13 may reduce the quality of welding spots and the efficiency of welding work. When the tip C for welding with a tap is used, in addition to the effects of the first and second embodiments, the vicinity of the tip of the tip portion 11 of the tip body 1 does not wear in any direction. Since the rod does not enter, it can be effectively used as a welding tip for a robot welding machine.

(4th example)

The C-shaped panel 3 used in each of the above embodiments has an arc-shaped inner surface and an arc-shaped outer surface of the annular groove 16, but in this embodiment, both the C-shaped panel 3 and the annular groove 16 have a straight line. It has a part. That is, as shown in FIG. 10 (A), a C-shaped panel having a straight portion 3a on the inner peripheral surface and an annular groove 16 having a portion 16a formed on the outer peripheral surface as shown in FIG. 10 (B) are provided. As shown in FIG. 3C, the C-shaped spring 3 is fitted into the annular groove 16 so that the straight portions of the two are aligned. By doing so, C-shaped spring 3 power! Since it is prevented from turning around, there is an advantage that the tightening force can be prevented.

(Fifth embodiment)

In each of the above embodiments, it was optional to provide the horizontal slit 14, but in the case where the horizontal slit 14 is provided, the horizontal slit 14 is formed as shown in FIG. An L-shaped horizontal slot with a vertical split 14a from above may be used. This makes it easier to tighten.

Industrial applicability

In the welding tip of the present invention, since the inner diameter of the passage hole for the welding rod is maintained substantially the same as the outer diameter of the welding rod, the contact force is always good, the current supply power is stable, and the welding quality is high. Can be improved.

In addition, since the tip of the welding rod is stable, the welding rod can be brought into contact with a desired position, so that accurate welding can be performed and the efficiency of the welding operation can be improved.

Claims

The scope of the claims

1. A welding tip comprising a tip body having a front end portion and a rear end portion and a c-shaped panel, wherein a welding hole passage hole is formed at an axial center portion of the tip body. A longitudinal slit extending from the distal end along the welding rod passage hole is formed at the distal end of the main body, and the outer peripheral surface of the distal end has a longitudinal slit force within a range where the vertical slitting force is formed. A welding groove, wherein the c-shaped spring is fitted in the annular groove so as to tighten the vertical slit.

2. The welding tip according to claim 1, wherein the tip of the tip body is covered with a cap made of a steel plate, and a bar is formed at the center of the tip of the cap so as to pass a bar.

3. A disk-shaped protector made of a wear-resistant material and formed with a small hole through which a welding rod is inserted in the center thereof is fixed to the tip end surface of the tip end portion of the tip body. Commercial chip.

4. A linear portion is formed on the outer peripheral surface of the annular groove, and a linear portion is also formed on the inner peripheral surface of the C-shaped panel. The chip according to claim 1, 2 or 3, wherein the parts contact each other and are fitted together.

5. The welding tip according to claim 1, wherein a horizontal slot is formed near the bottom end of the vertical slot inwardly from an outer periphery of a tip portion.

6. The welding tip according to claim 5, wherein the horizontal slot is an L-shaped horizontal slot including a vertical split from an inner end of the horizontal slot.