Coaxiality precise control device and method used for carrying out brazing on guide pipe in long and straight structure

Abstract

The invention provides a coaxiality precise control device and method used for carrying out brazing on a guide pipe in a long and straight structure. The device comprises an upper installing plate anda lower installing plate. The upper installing plate and the lower installing plate are connected through a supporting column. Locating pins are arranged at the two ends of the upper installing platerespectively. Locating bases opposite to the locating pins are arranged at the two ends of the lower installing plate respectively, wherein the locating bases share the same central axis. The controldevice further comprises an argon protection bin which is fixedly installed on one locating base. A guide pipe installing opening of the argon protection bin and the locating base on which the argonprotection bin is located share the same central axis. The method comprises the three steps that the first to-be-brazed guide pipe in the long and straight structure is installed between the locatingbase with the argon protection bin and the corresponding locating pin, and the to-be-brazed portion is totally arranged in the argon protection bin; argon is introduced, and brazing is started; afterbrazing on the first pipeline is finished, in-situ cooling is carried out, the argon protection bin is moved to the other locating base, and the brazing process of the second to-be-brazed guide pipe in the long and straight structure is started.

Description

technical field [0001] The invention belongs to the technical field of aero-engine pipeline connection, and in particular relates to a coaxial precision control device and method for brazing long straight structure conduits. Background technique [0002] Most of the internal conduits of the engine are long and straight structures, and the connection methods are divided into two connection methods: argon arc welding and brazing. Among them, the brazing structure conduit can only be positioned on the fixture and brazed in a free state. Brazing is the melting of the solder. , Filling the joint gap to achieve the connection method, the solder flow and cooling process, easily lead to the misalignment of the joint and the conduit, and it is difficult to ensure that the coaxiality of the long straight structure conduit after welding is not greater than 0.25mm. Contents of the invention [0003] Aiming at the problems existing in the prior art, the present invention provides a coa...

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Problems solved by technology

[0002] Most of the internal conduits of the engine are long and straight structures, and the connection methods are divided into two connection methods: argon arc welding and brazing. Among them, the brazing structure conduit can only be positioned on the fixture, and brazing is performed in a free state. Brazing is the melting of the solder. , to fill the gap at the joint to achieve the connection, the process of solder flow and cooling may easily lead to misalignment between the joint and the conduit, and it is difficult to ensure that the coaxiality of the long straight structure conduit after welding is not greater than 0.25mm.

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