JPS5914053Y2 - Replacement tip for Teig welding - Google Patents

Description

[Detailed explanation of the invention] This invention is a torch for plasma jet generation.
G) This relates to a replacement tip for TIG welding that converts into a welding torch.

In general, a torch for plasma jet generation is large and heavy, while a torch for Teig welding is small and lightweight, so it is very difficult to use both torches in common.

By the way, the present applicant has devised a small and lightweight torch for plasma jet generation and has already filed an application (Utility Application No. 54-18).
No. 4300).

According to this, the problem of miniaturization and weight reduction is solved, but
Due to the structure of the torch for plasma jet generation, parts such as an insulator are installed inside, so if this is used for TIG welding, the tungsten electrode rod will become red hot and the internal parts will be damaged. be.

The present invention was made in view of the above problems, and aims to provide a conversion tip for TIG welding that allows a plasma jet generation torch to be easily changed to a TIG welding torch without damaging internal parts. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

In the drawing, 1 is a torch, and the torch 1 is a torch body 2.
and a collet part 2 that holds the head part 13 and the electrode rod 32.
1. It is composed of a cap part 33 and a grip part 40.

As shown in FIG. 2, inside the torch body 2, there is a metal cylindrical bushing 3 and a first bushing 3. A second insulator 7.8 and a cylindrical first water jacket 9 are provided and are integrated by resin molding around these.

A conical inclined surface 4 and a threaded portion 5 are provided at the inner tip of the bush 3, and a threaded portion 6 is also provided at the inner center portion.

Further, an annular chamber 10 having an open front end is provided inside the side wall of the first water jacket 9.

The lower end of the torch body 2 is provided with one gas pipe 11 and two water pipes 12 a and 12 b connected to a gas source and a cooling water source (not shown), respectively. , water pipes 12a and 12b communicate with the annular chamber 10, respectively.

Cooling water flowing into the annular chamber 10 from one water pipe 12a is discharged through the other water pipe 12b.

The head portion 13 of the torch 1 includes a third insulator 14 and a second water jacket 15 (third
The second water jacket 15 has an annular recess 16.

By screwing the second water jacket 15 onto the outside of the first water jacket 9 with the third insulator 14 in contact with the front end surface of the second insulator 8,
The first to third insulators 7.8.14 are connected and the first
, the inner surfaces of the second water jackets l-9 and 15 are insulated and coated with insulation. 2nd water jacket 9.1
The five annular chambers 10 and the recesses 16 are connected to form one continuous sealed chamber 17.

The threaded portion 18a of the tip 18 is screwed onto the inner threaded portion 15a of the second water jacket 15, and
The threaded portion 20a of the nozzle 20 is screwed onto the outer threaded portion 15b of the second water jacket 15, whereby the head portion 13 is integrally fixed to the torch body 2.

As shown in FIGS. 6 and 7, the collet section 21 consists of a cylindrical collet body 22 and a collet chuck 27 having an insertion hole 28 in the center through which an electrode rod 32 is inserted. is provided with a conical tapered surface 23, and the outer rear end portion is provided with an inclined surface 24 that matches the inclined surface 4 of the bushing 3 and a threaded portion 25 that is threaded into the threaded portion 5. A large number of holes 26 are provided on the side surface of the portion to communicate between the inside and outside.

The front end of the collet chuck 27 is provided with a split groove 29, the front end with the split groove 29 is provided with a spherical part 30 with the center of curvature at point O, and the rear end is provided with a spherical part 30 with the center of curvature at point O and the curvature A spherical portion 31 with a large radius is provided.

The collet chuck 27 has an electrode rod 32 in the insertion hole 28.
is inserted into the collet body 22 with the tip of the electrode rod 32 protruding from the front end of the collet chuck 27.

By this fitting, the front end spherical part 3 of the collet chuck 27
0 displaceably abuts against the tapered surface 23 of the collet body 22.

The collet part 21, which is constructed by fitting the collet chuck 27 into the collet body 22, is inserted into the torch main body 2, and the threaded part 25 of the collet body 22 is inserted into the bush 3.
By screwing into the front end threaded portion 5 of the bushing 3, the inclined surface 4 of the bushing 3 and the inclined surface 24 of the collet body 22 match,
The collet body 22 is fixed at a substantially axial position inside the torch body 2.

The cap portion 33 is integrally insert-molded with a presser foot 34 shown in FIG.
6 is provided, and a wedge portion 37 is provided on the outer surface of the front end.

The threaded portion 37 of the presser foot 34 of the cap portion 33 is threadedly engaged with the rear end threaded portion 6 of the bush 3 of the torch main body 2, and as a result of this threaded engagement, the rear end spherical portion 31 of the collet chuck 27 and the taper of the presser foot 34 are screwed together. The collet chuck 27 is pressed, and the front end spherical portion 30 is pressed against the tapered surface 23 of the collet body 22.

By this pressing, the front end spherical portion 30 is pressed against the tapered surface 2.
3, the front end of the collet chuck 27 is bent inward due to the presence of the groove 29, and the electrode rod 32 is tightened and fixed.

At the same time, the collet chuck 27 has spherical portions 30 at both ends.
．． 31 are pressed by the tapered surface 23 of the collet body 22 and the tapered surface 36 of the presser foot 34, and the pressing force acts in the direction of the center of curvature of the spherical portion 30.31.
The collet chuck 27 is firmly fixed at an appropriate position.

Further, due to the screwing of the cap portion 33, an annular chamber 38 is formed between the outer surface of the collet chuck 2f and the inner surface of the bush 3, and an annular chamber 38 is formed between the outer surface of the collet chuck 27 and the inner surface of the collet body 22. Annular passages 39 are respectively formed.

The gas flowing into the bushing 3 through the gas pipe 11 (
After filling the chamber 38, the gas (for example, argon gas) flows through the passage 39, through the hole 26 of the collet body 22, and into the narrow hole 19 of the tip 18.

The electrode rod 32 and the chip 18 are each connected to an electric device (not shown), with the electrode rod 32 serving as a cathode and the chip 18 serving as an anode.

Then, when a DC arc is generated between the electrode rod 32 and the tip 18 and a gas (for example, arcon gas) is caused to flow around it as a swirling flow, the arc column is heated to an extremely high temperature and the gas flows into the narrow hole 19 of the tip 18. It spews out as a jet.

In the torch 1, the cathode electric circuit includes a bush 3,
It is composed of a collet body 22, a collet chuck 27, and an electrode rod 32, and the heat generated in this circuit is cooled by welding argon gas sent from the gas pipe 11.

In the conventional torch of this kind, since the collet body 22 is displaceably provided inside the torch body 2, heat generation is particularly intense due to the contact resistance between the collet body 22 and the bushing 3. Not only the tip 13 of the collet but also the area around the collet body 22 had to be cooled with water.

In the present invention, the collet body 22 does not need to be freely displaceable, and can be fixed with a wide contact area with the bushing 3, so that there is little heat generation due to contact resistance, and air cooling is sufficient.

Therefore, as in the above embodiment, argon gas for welding can also be used for air cooling, and water cooling can be used for the chip 1.
Since only around 8 is required, the pump pressure for sending the cooling water is small, which is efficient, and the torch as a whole can be downsized.

FIG. 9 shows the plasma jet generating torch 1 converted into a TIG welding torch, in which the nozzle 20 and tip 18 attached to the head portion 13 are removed, and the tip 41 for TIG welding is replaced. A nozzle 45 is attached.

The tip 41 is made of brass, and has an insertion hole 42 at the center of the front end with approximately the same diameter as the electrode rod 32, as shown in FIGS. A jet hole 43 and a threaded portion 44 serving as a mounting portion are provided.

The nozzle 45 has a cylindrical shape with a small diameter at the front end, and a threaded portion 46 is provided on the inner surface of the rear end.

The threaded portion 44 of the tip 41 is screwed onto the inner threaded portion 15a of the second water jacket 15, and the threaded portion 46 of the nozzle 45 is threaded onto the outer threaded portion 15a of the second water jacket 15.
b to form the head portion of the TIG welding torch.

Then, the electrode rod 32 is inserted into the insertion hole 42 of the chip 41, and the inner surface of the insertion hole 42 and the outer peripheral surface of the electrode rod 32 are brought into contact.

In a TIG welding torch, for example, the electrode rod 32 is a cathode, the base material 47 (see FIG. 9) is an anode, and the tip 41 is grounded with a pilot circuit to an anode-side electric device (not shown) cut off.

Then, with the tip of the electrode rod 32 slightly protruding from the front end of the nozzle 45, arc welding is performed in an atmosphere of inert gas while emitting inert gas (argon gas) from the nozzle 45.

Note that 48 is a weld metal, and 49 is a filler metal.

When performing TIG welding, the electrode rod 32 becomes extremely hot and may become red hot.

However, the outer peripheral surface of the electrode rod 32 and the insertion hole 4 of the tip 41
Since the electrode rods 32 are in contact with the inner surfaces of the insulators 7, 8, . 14 and the collet portion 21 are prevented from occurring.

In addition, the high frequency leakage after the pilot circuit is cut off is eliminated by the grounding action of the tip 41, and even if there is a risk of an accident causing an arc, the tip 41 prevents the arc from occurring, and the head 13
is protected.

Even if an accident occurs, only the chip 41 will be damaged, so the chip 41 can be replaced with a new one.

In the above TIG welding, the electrode rod 32 was used as a cathode and the base material 47 was used as an anode, but the reverse may be used, and the filler metal 49 is not necessarily required.

In the above embodiment, when changing the plasma jet generation torch to a TIG welding torch, the tip 41 and the nozzle 45 were replaced, but the nozzle 45 may be shared.

Furthermore, it goes without saying that the method of attaching the chip 41 to the head portion 13 (second water jet) 15) is not limited to screwing.

As is clear from the above explanation, according to the present invention, by simply replacing the tip of the plasma jet generating torch with a TIG welding tip, the plasma jet generating torch can be easily changed to a TIG welding torch, and can also be used in other applications. It is extremely practical because the members can be shared.

Furthermore, the TIG welding tip prevents the electrode rod from becoming red hot, so there is no risk of damage to the head or internal parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a plasma jet generation torch to which the present invention is applied, FIG. 2 is a sectional view of the torch body,
FIG. 3 is an enlarged sectional view of the second water jet, FIG. 4 is an enlarged sectional view of the chip, and FIG. 5 is an enlarged sectional view of the nozzle.
Fig. 6 is an enlarged sectional view of the collet body, Fig. 7 is an enlarged sectional view of the collet chuck, Fig. 8 is an enlarged sectional view of the presser foot, and Fig. 9 is an enlarged view of the head section when converted to a TIG welding torch. 10A and 10B are a left side view and a vertical sectional view of a TIG welding tip according to the present invention, and FIG. 11 is a sectional view of a TIG welding nozzle. 1... item-chi, 2... torch body, 3...
...Button, 9.15...Water jacket, 11...Gas pipe, 12a, 12b.
...Water tube, 13...Head part, 18...
...Tip, 19...Stricture hole, 21...
... Collet part, 22 ... Collet body, 23 ... Tapered surface, 27 ... Collet chuck, 29 ... Division groove, 30.31.・・・
... Spherical part, 32 ... Electrode rod, 33 ...
...Cap part, 34...Presser foot, 36...
... Tapered surface, 41 ... TIG welding tip, 42 ... Insertion hole, 43 ... Gas ejection hole, 44 ... Threaded part, 45 ...Nozzle, 46...Threaded part.

Claims (2)

[Scope of utility model registration request] (1) One end has a mounting part that is attached to the head in place of the tip of a plasma jet generation torch that holds an electrode rod, and the other end has an insertion hole through which the electrode rod is inserted in contact with the tip, and an inert gas is inserted into the nozzle. A replacement tip for TIG welding that is equipped with a gas outlet that blows out gas. (2) Claim 1 of the above utility model registration, characterized in that the attachment part of the chip to the head part is a threaded part, and the threaded part is screwed into the water jacket of the head part. Replacement tip for TIG welding as described in section.