JP2023043123A - contact tip - Google Patents

Abstract

To provide a contact tip in which copper shaving dust from a copper plated wire is prevented from being generated in a conical part of a fitting hole tip end of a housing, by simple processing and inexpensively.SOLUTION: A large-diameter fitting hole 7 is formed in a housing 2, the fitting hole 7 including a tapered conical part 6 communicating with a rear part of a first insertion hole 5. A projection part 10 projects in a tip end of an adapter 3, the projection part 10 including a conical projection 9 in a tip end thereof corresponding to the fitting hole 7 of the housing 2. The projection part 10 of the adapter 3 is fit to the fitting hole 7 of the housing 2 and the adapter 3 is coupled to the housing 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a contact tip for arc welding that guides a welding wire and supplies a welding current to the welding wire.

As a conventional contact tip of this kind, as shown in FIG. A protrusion 56 of an adapter 52 having a second insertion hole 55 having the same diameter as the first insertion hole 53 is inserted into the insertion hole 54 of the housing 51 so that the insertion hole for the welding wire extends in the central axis direction of the contact tip 50. There is one formed by the first insertion hole 53 and the second insertion hole of the adapter 52 . (See Patent Document 1, for example)

In such a device, the insertion hole of the housing 51 is drilled with a lathe or the like, so normally, as shown in FIG. It takes a lot of time and effort to grind the conical portion 58a to form the fitting hole 54a into a cylindrical shape as shown in FIG. A conical portion 58a is formed between the rear end of the adapter 52a and the tip of the second insertion hole 55a of the adapter 52a.

WO2021/059707

As described in Patent Document 1, if the housings 50 and 50a are made of TZM, continuous operation can be performed for a long time. The copper plating of the wire is scraped off at the rear end corner of the first insertion hole 53a of the housing 50a, the scraped fine powder copper accumulates in the conical portion 58a, and the fine powder copper accumulated during welding melts, There has been a problem that the welding wire is fused to the welding wire and the welding wire is not fed properly, resulting in welding failure or welding stoppage.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a contact tip which can be manufactured inexpensively by a simple process and which prevents copper shavings from the copper-plated wire from being generated on the conical portion at the tip of the insertion hole of the housing. It was made to

The contact tip of the present invention, which has been made to solve the above problems, comprises a housing having a first insertion hole formed in the axial direction and an adapter having a second insertion hole formed in the axial direction, and the housing and the adapter are coupled. In the contact tip having the first insertion hole and the second insertion hole communicating with each other to form a welding wire insertion hole, the housing is provided with a tapered conical portion communicating with the rear portion of the first insertion hole. An insertion hole with a diameter is formed, and a projection having a conical projection provided at the tip corresponding to the insertion hole of the housing is projected from the tip of the adapter, and the projection of the adapter is fitted into the insertion hole of the housing and attached to the housing. It is characterized by connecting an adapter.

The present invention comprises a housing having a first insertion hole formed in the axial direction and an adapter having a second insertion hole formed in the axial direction. In the contact tip having an insertion hole that communicates with a welding wire insertion hole, a large-diameter insertion hole having a tapered conical portion communicating with a rear portion of the first insertion hole is formed in the housing, and a tip end of the adapter. Secondly, a protrusion having a conical protrusion at the tip corresponding to the insertion hole of the housing is protruded, and the protrusion of the adapter is inserted into the insertion hole of the housing to connect the adapter to the housing. It is possible to prevent shavings of copper from the copper-plated wire from being generated on the conical portion at the tip of the insertion hole of the housing.

1 is a cross-sectional view of an embodiment of the invention; FIG. 2 is an exploded view of FIG. 1; FIG. 1 is a cross-sectional view of a first conventional example; FIG. FIG. 10 is a cross-sectional view of a second conventional example;

A preferred embodiment of the present invention will now be described with reference to FIGS. It is configured by an adapter 3.

The housing 2 has a first insertion hole 5 having a diameter corresponding to the wire diameter of the welding wire 4 formed in the central axial direction, and a rear portion communicating with the first insertion hole 5 and having a tapered tip at the tip. A large-diameter insertion hole 7 having a conical portion 6 is formed, and a threaded portion 8 is formed on the inner peripheral wall of the intermediate portion of the insertion hole 7 .

The adapter 3 has, at its tip, a projection 10 having a conical projection 9 corresponding to the conical portion 6 of the housing 2, which is fitted into the fitting hole 7 of the housing 2. A threaded portion 11 is formed on the outer peripheral surface of the adapter 3 to be screwed into the threaded portion 8 of the fitting hole 7, and a threaded portion at the rear of the adapter 3 is screwed to a torch (not shown) to attach the contact tip 1. 12 is formed, and a second through hole 13 having substantially the same diameter as the first through hole 5 of the housing 2 is formed in the center axial direction of the adapter 3 .

Next, a method of assembling the contact tip 1 will be described. to connect the adapter 3 to the housing 2. At this time, the conical projection 9 at the tip of the projection 10 of the adapter 3 is fitted into the conical portion 6 at the rear end of the first insertion hole 5 of the housing 2, and the first insertion hole 5 and the second insertion hole 13 are fitted. A through-hole is formed in the central portion in which the .

As described above, the present invention consists of the housing 2 having the first insertion hole 5 formed in the axial direction and the adapter 3 having the second insertion hole 13 formed in the axial direction. , in the contact tip 1 which connects the first insertion hole 5 and the second insertion hole 13 to form an insertion hole for the welding wire 4, a tapered conical portion communicating with the rear portion of the first insertion hole 5 in the housing 2; A large-diameter insertion hole 7 provided with 6 is formed, and a protrusion 10 having a conical protrusion 9 provided at the tip corresponding to the insertion hole 7 of the housing 2 is protruded from the tip of the adapter 3, and the housing 2 is fitted. Since the projection 10 of the adapter 3 is fitted into the hole 7 and the adapter 3 is connected to the housing 2, the insertion hole 7 of the housing 2 can be machined only by ordinary machining, and the projection 10 of the adapter 3 can be machined by ordinary machining. Since it can be processed by cutting the outer surface, the processing can be facilitated, and furthermore, the gap between the first insertion hole 5 of the housing 2 and the second insertion hole 13 of the adapter 3 can be eliminated, and the copper plated wire This prevents the generation of shavings from the copper plating, enabling long-term continuous operation.

REFERENCE SIGNS LIST 1 contact tip 2 housing 3 adapter 4 welding wire 5 first insertion hole 6 conical portion 7 insertion hole 9 conical projection 10 projection 13 second insertion hole

Claims (1)

It consists of a housing having a first insertion hole formed in the axial direction and an adapter having a second insertion hole formed in the axial direction. A large-diameter insertion hole provided with a tapered conical portion communicating with the rear portion of the first insertion hole is formed in the housing, and the tip of the adapter is attached to the housing. 1. A contact tip characterized in that a protrusion having a conical protrusion at its tip corresponding to an insertion hole is protruded, and the protrusion of an adapter is fitted into the insertion hole of a housing to connect the adapter to the housing.

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