Vacuum brazing method of double-path rotating joint

Abstract

The invention discloses a vacuum brazing method of a double-path rotating joint. The vacuum brazing method comprises the flowing steps of S1, processing of an upper cover plate; S2, processing of a middle cover plate; S3, processing of a lower cover plate; S4, pre-welding surface treating of the upper cover plate, the middle cover plate and the lower cover plate; S5, making of brazed filler metal by laser cutting, specifically, the thickness specification chosen for the brazed filler metal is 0.05 mm, and the overall dimension of the brazed filler metal is 2-3 mm bigger than a contact surface of an adjacent spare part; S6, pre-welding assembling; and S7, vacuum brazing, specifically, a half-finished double-path rotating joint is put into a vacuum aluminum brazing furnace, a work fixture is used for assembling the half-finished double-path rotating joint, a vacuum brazing temperature process curve is set, the vacuum aluminum brazing furnace is coarsely vacuumized and then highly vacuumized, the half-finished double-path rotating joint and the brazed filler metal are heated according to the set vacuum brazing temperature process curve, heat is preserved for 15-20 min under the temperature of 615 DEG C, and after heat preservation is completed, cooling along with the furnace is conducted, so that vacuum brazing is realized. The vacuum brazing method of the double-path rotating joint has the beneficial effects of simplifying production processes, enhancing production efficiency, reducing welding torsion, and enhancing size precision and corrosion performance.

Description

technical field [0001] The invention relates to the technical field of double-path rotary joint production, in particular to a double-path rotary joint vacuum brazing method. Background technique [0002] The production process of the two-way rotary joint mainly used by microwave device manufacturers is usually a production method in which parts such as waveguides, flanges, center cylinders, cover plates, and matching blocks are welded multiple times. Due to the cumulative deformation caused by multiple welding, this processing method has a large amount of deformation and is not easy to be controlled. In addition, the local heating of the flame brazing process makes it difficult to guarantee the dimensional accuracy of the entire cavity; the internal structure of the two-way rotary joint is complex. Sub-flame brazing uses highly corrosive fluorine-containing flux. It is difficult to completely remove the residual flux inside, especially the dead corners that cannot be observ...

AI Technical Summary

Problems solved by technology

Due to the cumulative deformation caused by multiple welding, this processing method has a large amount of deformation and is not easy to be controlled. In addition, the local heating of the flame brazing process makes it difficult to guarantee the dimensional accuracy of the entire cavity; the internal structure of the two-way rotary joint is complex. Sub-flame brazing uses highly corrosive fluorine-containing flux. It is difficult to completely remove the residual flux inside, especially the dead corners that cannot be observed inside. It is very easy to corrode in a humid environment during work, which greatly reduces the use of lifespan, low production efficiency

[0003] At present, the existing production method of flame brazing is used for welding, but due to its inherent technical defects, the overall electrical performance of the product is not easy to guarantee, the welding quality fluctuates greatly, the technical level of welding personnel is high, the service life of the product is greatly shortened, and the structural form Complicated, the whole production cycle is long, and a large number of special fixtures are required for positioning during welding, which increases the production cost

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