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Brazing furnace and brazing method for aluminum material

A brazing method and a technology of a brazing furnace, applied in welding equipment, welding equipment, electric heating devices, etc., can solve problems such as decreased flux function, clogging of electronic components, and stable quality of difficult brazing, so as to achieve good brazing, reduce The effect of manufacturing costs

Inactive Publication Date: 2016-05-04
FURUKAWA SKY ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluoride-based flux used in the CAB method has the problem that its function as a flux decreases when it is oxidized by heating during brazing
For example, in aluminum heat exchangers represented by automotive heat exchangers, problems such as deterioration of surface treatment properties due to flux residues may occur during manufacture.
In addition, in the use of aluminum heat exchangers, the following problems may occur: clogging of the refrigerant passage by flux, etc., or adverse effects of flux, etc. on electronic components that are in contact with the heat exchanger, etc.
However, as of today, there are basically no examples of practical use of the flux-free soldering method under an inert gas atmosphere.
As the main reasons that hinder the practical use of the fluxless soldering method, the following reasons can be cited: the reason why the bonding ability is inferior compared with the soldering method using flux, and the brazing property is easily affected by the working environment and it is difficult to use it. Reasons for the stable quality of brazing joints
In particular, the latter problem may cause serious joint defects due to the storage environment and / or usage conditions of tools, materials to be processed, and solder, and thus becomes a major factor that hinders the practical use of the fluxless soldering method.
[0016] As described above, in the prior art, there was a problem that it was difficult to stabilize the quality of the soldered joint in soldering with a reduced coating amount of flux or soldering without using flux.
Furthermore, it is considered that moisture, etc. brought into the brazing heating zone evaporates or thermally decomposes due to heating, thereby deteriorating the brazing property.
The above-mentioned (1) to (3) presumptions always have multiple effects on brazability due to compound effects, so it is difficult to find out the cause of the deterioration of brazability, and it also hinders the discovery of a method for improving brazability for a longer period of time. Solutions

Method used

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  • Brazing furnace and brazing method for aluminum material
  • Brazing furnace and brazing method for aluminum material
  • Brazing furnace and brazing method for aluminum material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Examples of the above-mentioned brazing furnace and brazing method will be described using the drawings. Such as figure 1 As shown, the brazing furnace 1 is used for brazing a processed material 100 made of aluminum. The brazing furnace 1 has a preliminary heating chamber 2 and a brazing chamber 3 . The preliminary heating chamber 2 has: a vacuum pump 21 for depressurizing the chamber in a state where the material to be processed 100 is accommodated; a preliminary heating device 22 for preheating the material to be processed 100 under a reduced pressure atmosphere; A repressurization gas introduction device 23 for inert gas used to repressurize the chamber. The brazing chamber 3 has: a gas replacement device 31 for introducing an inert gas into the chamber; and a main heating device 32 for heating the material 100 to be processed to a brazing temperature.

[0058] The brazing furnace 1 of this example is an external heating type heating furnace in which a preliminary...

Embodiment 2

[0070] This example is an example of the brazing furnace 1b provided with three subunits 32a, 32b, 32c and the cooling chamber 4. Such as figure 2 As shown, the main heating device 32 in the brazing furnace 1b of this example has three sub-units 32a to 32c whose temperatures can be individually adjusted. The sub-units 32 a to 32 c are arranged along the conveyance direction of the material 100 to be processed. Moreover, the partition door 35 is provided openably and closably between adjacent subunits 32a-32c. In this example, the soaking area dimensions of the three heating zones 36 ( 36 a , 36 b and 36 c ) separated by the partition door 35 are all 300 mm in length, 200 mm in width and 200 mm in height. In addition, the replacement gas line 311 of the gas replacement device 31 enters each of the heating zones 36a to 36c.

[0071] In addition, the brazing furnace 1 b of this example has a cooling chamber 4 communicating with the brazing chamber 3 . In the brazing furnace ...

experiment example 1

[0076] This example is an example of performing a brazing test using the brazing furnace 1 of Example 1. FIG. In this example, as shown in Table 1, various manufacturing conditions were changed, and 12 kinds of honeycomb panels (test bodies E1 to E6 and test bodies C1 to C6) were produced. The configuration and experimental method of the material to be processed 101 will be described below.

[0077]

[0078] Such as image 3 As shown, the processed material 101 of this example has: a rectangular frame portion 51 composed of four hollow extruded shapes 511; a honeycomb core 52 disposed inside the frame portion 51; and a frame portion 51 and a honeycomb core 52 A panel (not shown) clamped from top to bottom. After assembling these parts into a predetermined shape (refer to Figure 4 ) After that, the honeycomb panel can be made by brazing.

[0079] The outer dimension of the frame portion 51 in the longitudinal direction (longitudinal direction) is 260 mm, and the outer di...

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Abstract

A brazing furnace (1) has a preheating chamber (2) and a brazing chamber (3). The preheating chamber (2) has the following: a vacuum pump (21) for reducing the pressure inside the chamber in a state in which the chamber houses a material to be treated (100); a preheating device (22) for preheating the material to be treated (100) under a reduced-pressure atmosphere; and a pressure-restoring gas introducing device (23) that introduces an inert gas for restoring the pressure inside the chamber after preheating. The brazing chamber (3) has a gas substitution device (31) for introducing the inert gas into the chamber and a main heating device (32) that heats the material to be treated (100) to a brazing temperature, and as a result of the foregoing, the brazing joining quality can be easily stabilized with regard to brazing in which the flux application amount is reduced or in which no flux is used.

Description

technical field [0001] The present invention relates to a brazing furnace for brazing aluminum materials and a brazing method for aluminum materials. Background technique [0002] As a brazing method for aluminum materials, the CAB (Controlled Atmosphere Brazing (Controlled Atmosphere Brazing) method of applying flux to the material to be processed and heating the material to be processed under an inert gas atmosphere such as nitrogen to perform brazing is often used. The fluoride-based flux used in the CAB method has a problem that its function as a flux decreases when it is oxidized by heating during brazing. In order to avoid this problem, in the CAB method, usually, a sufficient amount of flux is applied, and the oxygen concentration in the atmosphere is controlled to be 100 ppm or less, more preferably 20 ppm or less, for brazing. [0003] Since the fluoride-based flux is non-corrosive to aluminum, it is not necessary to wash the aluminum material after brazing to remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K3/04B23K3/08B23K1/008
CPCB23K1/008B23K1/19B23K31/02B23K3/04B23K3/08B23K2103/10
Inventor 伊藤泰永柳川裕迫田正一
Owner FURUKAWA SKY ALUMINUM CORP
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