阅读说明：本技术 6061铝合金真空钎焊加工工艺 (Vacuum brazing processing technology for 6061 aluminum alloy ) 是由 胡琼 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种6061铝合金真空钎焊加工工艺。将4004铝合金钎焊料放置在6061铝合金工件钎焊面上,将工件放入钎焊炉内,钎焊炉点火,将炉内温度加热至400℃,然后在400℃温度下保温0.5h,保温处理后再将炉内温度加热至565℃,然后在565℃温度下保温0.5h,保温处理后再将炉内温度加热至590℃,然后在590℃温度下保温1h,钎焊完成后,工件在炉内自然冷却至室温；将钎焊后的工件加热2h至525±5℃,在此温度下保温1.5h,然后将工件取出放入35℃-40℃的清水中冷却至室温,然后将工件放入恒温试验箱进行人工时效,工件加热至170℃并保温8h,然后在空气中自然冷却。工件抗拉强度高,能满足航空电子设备机箱的强度使用要求。(The invention discloses a vacuum brazing processing technology for 6061 aluminum alloy. Placing 4004 aluminum alloy brazing material on a brazing surface of a 6061 aluminum alloy workpiece, placing the workpiece into a brazing furnace, igniting the brazing furnace, heating the temperature in the brazing furnace to 400 ℃, then preserving heat for 0.5h at the temperature of 400 ℃, heating the temperature in the brazing furnace to 565 ℃, then preserving heat for 0.5h at the temperature of 565 ℃, heating the temperature in the brazing furnace to 590 ℃ after heat preservation, then preserving heat for 1h at the temperature of 590 ℃, and after brazing is finished, naturally cooling the workpiece to room temperature in the brazing furnace; heating the brazed workpiece for 2h to 525 +/-5 ℃, preserving heat for 1.5h at the temperature, taking out the workpiece, cooling the workpiece in clear water at the temperature of 35-40 ℃ to room temperature, putting the workpiece in a constant-temperature test box for artificial aging, heating the workpiece to 170 ℃, preserving heat for 8h, and naturally cooling in the air. The tensile strength of the workpiece is high, and the strength use requirement of the avionic device chassis can be met.)

1. A6061 aluminum alloy vacuum brazing processing technology comprises the following steps: (1) selecting brazing materials: the main component of the brazing material is consistent with that of 6061 aluminum alloy, the liquidus temperature of the brazing material is lower than the solidus temperature of 6061 aluminum alloy, the temperature difference between the solidus temperature and the liquidus temperature of the brazing material is within 40 ℃, and the brazing material contains components which are mutually soluble with 6061 aluminum alloy in liquid state;

(2) cleaning before welding: soaking a 6061 aluminum alloy workpiece in a 5% NaOH solution at 60 ℃ for 10-15s, then cleaning the workpiece in clean water, and then putting the workpiece in a volume ratio of

(3) brazing: before brazing, wiping a welding surface of a 6061 aluminum alloy workpiece by using acetone, then placing brazing solder on the brazing surface, putting the workpiece into a brazing furnace, igniting the brazing furnace, heating the temperature in the furnace to 400 ℃, then preserving heat for 0.5h at the temperature of 400 ℃, heating the temperature in the furnace to 565 ℃ after heat preservation treatment, then preserving heat for 0.5h at the temperature of 565 ℃, heating the temperature in the furnace to 590 ℃ after heat preservation treatment, then preserving heat for 1h at the temperature of 590 ℃, and naturally cooling the workpiece to room temperature in the furnace after brazing is finished;

(4) postweld heat treatment: heating the brazed workpiece for 2h to 525 +/-5 ℃, preserving heat for 1.5h at the temperature, taking out the workpiece, cooling the workpiece in clear water at the temperature of 35-40 ℃ to room temperature, putting the workpiece in a constant-temperature test box for artificial aging, heating the workpiece to 170 ℃, preserving heat for 8h, naturally cooling the workpiece in the air, and finishing heat treatment.

2. The 6061 aluminum alloy vacuum brazing process of claim 1, wherein: 4004 aluminum alloy is selected as the brazing material.

The technical field is as follows:

the invention belongs to the technical field of aluminum alloy vacuum brazing production, and particularly relates to a 6061 aluminum alloy vacuum brazing processing technology.

Background art:

vacuum brazing is a high-quality welding method in which brazing filler metal is filled in gaps between base metals by capillary action without using a brazing flux in a vacuum environment. The aluminum alloy chassis has the advantages of small welding deformation, high appearance quality, simple structure, high processing efficiency, environmental protection and the like, is widely applied to the industries of aerospace, aviation and the like, and is a common processing mode of aluminum alloy chassis of airborne equipment of avionics systems.

In the last 70 th century, vacuum brazing of aluminum alloys has been studied abroad. At present, the American, English and Japanese are already in the high-quality batch production stage, but the vacuum brazing in China starts late, is mainly used for brazing stainless steel and high-temperature alloy of rocket engines, aeroengines and the like, and along with the requirement of lightweight of avionic devices, aluminum alloy is increasingly used for airborne equipment cases. The 6061 aluminum alloy belongs to heat treatment strengthening alloy, has good formability, weldability, machinability, corrosion resistance and medium strength, and is widely applied to airborne equipment. At present, a linear cutting mode is mainly adopted for machining the case cavity for case products, the machining mode is low in efficiency and wastes materials, and therefore the 6061 aluminum alloy vacuum brazing machining process needs to be researched, and the machining efficiency of the case products is improved.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

The invention content is as follows:

the invention aims to provide a vacuum brazing processing technology for 6061 aluminum alloy, thereby overcoming the defects in the prior art.

In order to realize the purpose, the invention provides a vacuum brazing processing technology of 6061 aluminum alloy, which comprises the following steps:

(1) selecting brazing materials: the main component of the brazing material is consistent with that of 6061 aluminum alloy, the liquidus temperature of the brazing material is lower than the solidus temperature of 6061 aluminum alloy, the temperature difference between the solidus temperature and the liquidus temperature of the brazing material is within 40 ℃, and the brazing material contains components which are mutually soluble with 6061 aluminum alloy in liquid state;

(2) cleaning before welding: soaking a 6061 aluminum alloy workpiece in a 5% NaOH solution at 60 ℃ for 10-15s, then cleaning the workpiece in clean water, and then putting the workpiece in a volume ratio ofSoaking the workpiece in the solution for 1-2m, then putting the workpiece into normal-temperature clear water for cleaning, then putting the workpiece into clear water at 60 ℃ for cleaning, then putting the workpiece into a drying oven at 100 ℃ for drying, taking out the workpiece, wrapping the workpiece with clean paper and waiting for welding;

(3) brazing: before brazing, wiping a welding surface of a 6061 aluminum alloy workpiece by using acetone, then placing brazing solder on the brazing surface, putting the workpiece into a brazing furnace, igniting the brazing furnace, heating the temperature in the furnace to 400 ℃, then preserving heat for 0.5h at the temperature of 400 ℃, heating the temperature in the furnace to 565 ℃ after heat preservation treatment, then preserving heat for 0.5h at the temperature of 565 ℃, heating the temperature in the furnace to 590 ℃ after heat preservation treatment, then preserving heat for 1h at the temperature of 590 ℃, and naturally cooling the workpiece to room temperature in the furnace after brazing is finished;

(4) postweld heat treatment: heating the brazed workpiece for 2h to 525 +/-5 ℃, preserving heat for 1.5h at the temperature, taking out the workpiece, cooling the workpiece in clear water at the temperature of 35-40 ℃ to room temperature, putting the workpiece in a constant-temperature test box for artificial aging, heating the workpiece to 170 ℃, preserving heat for 8h, naturally cooling the workpiece in the air, and finishing heat treatment.

Preferably, in the technical scheme, 4004 aluminum alloy is selected as the brazing material.

Compared with the prior art, the invention has the following beneficial effects:

by adopting 4004 aluminum alloy solder, the tensile strength of the welding line of 6061 aluminum alloy after vacuum brazing reaches 126MPa, the tensile strength of the welding line after heat treatment strengthening reaches about 70% of that of the parent metal, the strength use requirement of the case of avionic equipment can be met, and the quality and the size of the welding line of the case obtained by adopting the vacuum brazing process can meet the use requirement of the case.

Description of the drawings:

FIG. 1 is a schematic view of a chassis structure;

FIG. 2 is a diagram of a weld penetration test object.

The specific implementation mode is as follows:

the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.