JP3188144B2 - Brazing method - Google Patents

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 metal materials applied to aircraft engine parts and the like.

[0002]

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

Further, as shown in FIG.
The flux 14 is applied to the brazing portion of the brazing material, and the brazing wire 4 is supplied while the brazing portion is heated by the gas torch 15.
I was brazing.

[0004]

In the conventional brazing method, when a work is placed in a furnace in a non-oxidizing atmosphere and brazing is performed, a brazing material is set in a brazing portion in advance and heated to a brazing temperature. Therefore, it takes time from the start of melting of the brazing material to brazing, and the low melting point metal (Zn, Sn) is used.
), The components of the brazing material were melted and separated, and brazing was not possible.

Further, when brazing a workpiece by heating with a gas torch, brazing is performed by heating only the brazing portion, and it is difficult to keep the temperature of the brazing portion uniform and constant. Defects (poor bonding rate) were likely to occur.

Further, in order to prevent oxidation of the brazing portion,
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.

[0007] The present invention is intended to solve the above-mentioned problems. Even in the case of a silver brazing material containing a low-melting-point metal, the brazing can be performed without causing the brazing material components to be melted and separated. It is an object of the present invention to provide a brazing method that can cope with a high-temperature brazing material as unnecessary.

[0008]

According to the brazing method of the present invention, after the work is heated to a brazing temperature in a non-oxidizing atmosphere chamber, the unmelted brazing material is continuously fed to the brazing portion of the work. Supply and supply the supplied brazing material
Melted instantaneously at the temperature and the melted brazing material
By osmosis have line the brazing of work in between, then work
Cool to a temperature that does not oxidize in a non-oxidizing atmosphere chamber
It is characterized by being taken out .

[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 a brazing temperature. Supply materials.

[0010] The supplied brazing material is instantaneously melted at the temperature of the work, and the melted brazing material penetrates into the gap of the brazing joint and is brazed. Thereafter, the work is cooled to a temperature at which the work is not oxidized in the non-oxidizing atmosphere chamber, and the work is taken out.

In the brazing method according to the present invention, no flux is required because the oxidation of the work is protected in a non-oxidizing atmosphere, and after the work is heated to the brazing temperature,
Since the unmelted brazing material is supplied to the brazing part and the brazing material is instantaneously melted at the temperature of the work, brazing can be performed without causing melting and separation even in the case of silver brazing material containing a low melting point metal. .

[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 evacuating the inside thereof, a cart 8 disposed so as to be able to be taken in and out of the chamber 7, and a work 5 arranged on the cart 8. The apparatus includes a rotary table 6 to be mounted, and a robot 1 disposed on the carriage 8 and having a plasma gun 2 and a wire feeder 3 at the end of an arm.

In the above, when the work 5 is to be brazed, the work 5 is first placed on a turntable 6, a cart 8 on which the turntable 6 is disposed is put into a chamber 7, and the inside of the chamber 7 is evacuated. I do.

Next, a plasma gas is ejected from a plasma gun 2 disposed at the end of the arm of the robot 1 to cause a work 5
And the workpiece 5 is heated to the brazing temperature. Thereafter, the tip of the brazing wire 4 is brought into contact with the brazing portion, and the brazing 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 to a temperature at which the work is not oxidized in the chamber 7 and the work 5 is taken out.

Next, a brazing apparatus 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 has a cylindrical quartz tube 10 in which an inert gas 11 is filled, and a rotary table which is disposed so as to be able to be taken in and out of the quartz tube 10 and on which a work 5 is mounted. 6, the above quartz tube 10
And a brazing material wire inlet 12 which penetrates the side wall of the quartz tube 10 and allows the brazing material wire 4 to be supplied to the inside.

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

Next, the brazing wire 4 is supplied from the brazing wire inlet 12 provided on the side wall of the quartz tube 10 and the work 5
And the brazing wire 4 is supplied while melting the brazing wire 4 at the temperature of the work 5. 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.

Thereafter, an inert gas is flowed 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 turntable 6.

[0020]

According to the brazing method of the present invention, after the work is heated to the brazing temperature in the non-oxidizing atmosphere chamber, the unmelted brazing material is continuously supplied to the brazing portion of the work to perform the brazing. By using no flux, defects such as porosity due to the influence of the flux do not occur at the brazed joint because the flux is not used, and the brazing material melts instantaneously and penetrates into the gaps of the brazed portion. Problems such as melting of the brazing material and excessive diffusion of the brazing material to the base material are eliminated, brazing quality is stabilized, and brazing can be performed for all brazing materials 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 view of a brazing device according to a second embodiment of the present invention.

FIG. 3 is an explanatory view of a conventional brazing method, in which (a) is an explanatory view of a method using a non-oxidizing atmosphere furnace, and (b) is an explanatory view of a method using a gas torch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Robot 2 Plasma gun 3 Wire feeder 4 Brazing material wire 5 Work 6 Rotary table 7 Chamber 8 Truck 9 High frequency heating coil 10 Quartz tube 11 Inert gas 12 Brazing material wire inlet 13 Inside furnace in non-oxidizing atmosphere 14 Flux 15 Gas torch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 1/00 330 B23K 1/008 B23K 1/002 B23K 31/02 310

Claims (1)

(57) [Claims] After heating a work to a brazing temperature in a non-oxidizing atmosphere chamber, an unmelted brazing material is continuously supplied to a brazing portion of the work in that state, and the supplied brazing material is cooled.
Melts instantaneously at the temperature of the workpiece and joins the melted brazing material
To penetrate the gap parts by have rows brazing work, then Wa
Up to a temperature that does not cause oxidation in a non-oxidizing atmosphere chamber
A brazing method characterized by being cooled and taken out .