JPH091323A - Brazing method - Google Patents

Abstract

PURPOSE: To provide a brazing method capable of brazing even with the silver brazing filler metal containing the metal of low melting point, dispensing with the flux, and capable of being adapted to the high temperature brazing filler metal. CONSTITUTION: After a work 5 is heated to the brazing temperature in a non- oxidizing atmosphere chamber 7, the non-melted brazing filler metal 4 is continuously fed to a part to be brazed of the work 5 to achieve the brazing. Because no flux is used, no defects such as the porosity influenced by the flux are generated to the brazed part, and because the brazing filler metal 4 is instantaneously melted to be penetrated into the clearance of the brazed part, failures such as the liquation of the brazing filler metal, and the excessive diffusion of the brazing filler metal to the base metal are eliminated, the quality of the brazing becomes stable, and the brazing can be realized for every brazing filler metal irrespective of the kind of the brazing filler metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method for metallic materials applied to engine parts of aircraft.

[0002]

2. Description of the Related Art In a conventional brazing method for a metallic material, as shown in FIG. Put the work 5 into the and heat it to the brazing temperature,
I was brazing.

Further, as shown in FIG. 3B, the work 5
Flux 14 is applied to the brazing part of No. 4, and the brazing material wire 4 is supplied while heating the brazing part with the gas torch 15.
I was brazing.

[0004]

In the conventional brazing method, when the work is put in the furnace in the non-oxidizing atmosphere for brazing, the brazing material is set in the brazing part in advance and heated to the brazing temperature. Therefore, it takes time from the start of melting of the brazing material to the brazing, and the low melting point metal (Zn, Sn
Etc.), the brazing material components were melted and separated, and brazing could not be performed.

Further, in the case of brazing by heating the brazing part of the work with a gas torch, it is difficult to keep the temperature of the brazing part at a uniform and constant temperature by brazing only the brazing part. Defects (poor bonding rate) were likely to occur.

Further, in order to prevent oxidation of the brazed part,
Although it is necessary to apply a flux, there is no flux that can be used at a temperature of 950 ° C. or higher, and there is a limit to the brazing material that can be brazed with a gas torch.

The present invention is intended to solve the above problems, and even in the case of a silver brazing filler metal containing a low melting point metal, brazing can be performed without causing the brazing filler metal components to be melted and separated, and a flux can be formed. It is an object of the present invention to provide a brazing method which is unnecessary and can cope with high temperature brazing material.

[0008]

In the brazing method of the present invention, the work is heated to the brazing temperature in the non-oxidizing atmosphere chamber, and then the unmelted brazing material is continuously applied to the brazing portion of the work. It is characterized by supplying and brazing the work.

[0009]

When the work is brazed by the brazing method of the present invention, first, the work to be brazed is placed in a non-oxidizing atmosphere chamber and heated to the brazing temperature, and then the unmelted brazing material is left in the brazing part. Supply materials.

The supplied brazing material is instantly melted at the temperature of the work, and the melted brazing material penetrates into the gap of the brazing joint portion and is brazed. After that, the work is cooled in the non-oxidizing atmosphere chamber to a temperature at which the work is not oxidized, and the work is taken out.

In the brazing method of the present invention, no flux is required because the oxidation of the work is protected in a non-oxidizing atmosphere, and after heating the work to the brazing temperature,
Since the unmelted brazing material is supplied to the brazing part and the brazing material is instantly melted at the temperature of the work, it is possible to braze even in the case of a silver brazing material containing a low melting point metal without causing melting and melting. .

[0012]

FIG. 1 shows a brazing apparatus according to a first embodiment of the present invention.
This will be described below. The apparatus according to the present embodiment shown in FIG. 1 includes a chamber 7 capable of vacuuming the inside thereof, a carriage 8 arranged to be able to be put in and taken out from the chamber 7, a work 5 arranged on the carriage 8. A rotary table 6 to be mounted, and a robot 1 provided on the carriage 8 and provided with a plasma gun 2 and a wire feeder 3 at the tip of an arm are provided.

When the work 5 is brazed in the above, first, the work 5 is placed on the rotary table 6, the carriage 8 on which the rotary table 6 is disposed is placed in the chamber 7, and a vacuum is drawn inside the chamber 7. I do.

Next, a plasma gas is ejected from a plasma gun 2 provided at the tip of the arm of the robot 1 to eject the work 5.
Then, the work 5 is heated to the brazing temperature. After that, the tip of the brazing material wire 4 is brought into contact with the brazing portion, and the brazing material wire 4 is supplied while being melted.

After the supply of the brazing material wire 4 reaches a predetermined amount, the supply of the brazing material wire 4 is stopped and the brazing material wire 4 is separated from the work 5. Then, the work is lowered in the chamber 7 to a temperature at which it is not oxidized, and the work 5 is taken out.

Next, a brazing device according to a second embodiment of the present invention will be described with reference to FIG. The apparatus according to the present embodiment shown in FIG. 2 includes a cylindrical quartz tube 10 filled with an inert gas 11 therein, and a rotary table on which a work 5 is mounted so that it can be taken in and out of the quartz tube 10. 6, the quartz tube 10
A high-frequency heating coil 9 disposed on the outer side wall of the quartz tube 10 and a brazing material wire inlet 12 penetrating the side wall of the quartz tube 10 and capable of supplying the brazing material wire 4 to the inside.

In the above, when brazing the work 5, the work 5 is first placed on the rotary table 6 and the rotary table 6 is placed in the quartz tube 10, and then the inert gas 11 is placed in the quartz tube 10. The work 5 is introduced to create a non-oxidizing atmosphere, and the work 5 is heated to the brazing temperature by the high-frequency heating coil 9.

Next, the brazing material wire 4 is supplied from the brazing material wire introduction port 12 provided on the side wall of the quartz tube 10, and the work 5 is introduced.
The brazing material wire 4 is supplied while the brazing material wire 4 is melted at the temperature of the work 5 while being brought into contact with the brazing part of. After the supply of the brazing material wire 4 reaches a predetermined amount, the supply of the brazing material wire 4 is stopped and the brazing material wire 4 is pulled out.

Then, an inert gas is flown into the quartz tube 10 to cool the work 5 to a temperature at which the work 5 is not oxidized,
The work 5 is taken out of the quartz tube 10 together with the rotary table 6.

[0020]

According to the brazing method of the present invention, the work is heated to the brazing temperature in the non-oxidizing atmosphere chamber, and then the unmelted brazing material is continuously supplied to the brazing portion of the work for brazing. Since the flux is not used, defects such as porosity due to the influence of the flux do not occur in the brazing joint, and the brazing material melts instantly and penetrates into the gap of the brazing joint. Problems such as melting and separation of the brazing material and excessive diffusion of the brazing material to the base material are eliminated, the brazing quality is stable, and brazing of all brazing materials is possible regardless of the type of brazing material.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a brazing device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a brazing device according to a second embodiment of the present invention.

3A and 3B are explanatory views of a conventional brazing method, FIG. 3A is a method using a non-oxidizing atmosphere furnace, and FIG. 3B is an explanatory view of a method using a gas torch.

[Explanation of symbols]

 1 Robot 2 Plasma Gun 3 Wire Feeder 4 Brazing Wire 5 Work 6 Rotating Table 7 Chamber 8 Cart 9 High Frequency Heating Coil 10 Quartz Tube 11 Inert Gas 12 Brazing Wire Inlet 13 Flux 15 Gas Torch

Claims (1)

[Claims] 1. A method of brazing a work by heating the work to a brazing temperature in a non-oxidizing atmosphere chamber, and then continuously supplying an unmelted brazing material to the brazing portion of the work. Brazing method.