A protective device for nuts with anodized layer in the process of flame brazing

Abstract

A protective device for nuts with anodized layers in the process of flame brazing, including a shell and a thermal insulation liner; the shell is two semi-cylindrical shells symmetrically distributed, with a semicircular hole on the top surface, and an outer surface Both are sprayed with high-temperature ceramics, and the whole nut is wrapped in it during installation; the heat insulation liner is composed of two semi-circular bodies, which are placed on the upper end surface of the nut during installation to isolate the nut from the shell. The protective tooling designed by the present invention can well protect the nuts with anodized layer during the flame brazing process, realize the processing of such parts, and completely solve the problems of welding protection and welding quality. Spraying high-temperature ceramics solves the problem that the tooling cannot be removed during the welding process of the parts, and also solves the problem that the ceramic tooling is difficult to process. The asbestos net is placed under the high-temperature ceramic tooling, and the asbestos net debris is successfully prevented. Pollution of the weld seam ensures the quality of the weld seam.

Description

technical field [0001] The invention belongs to the protection technology of aero-engine processing, and in particular relates to a protection device for nuts with anodized layers in the process of flame brazing. Background technique [0002] Aeroengine piping is a common structure of engines, and the external piping system of aeroengines is complex and numerous. Therefore, in order to avoid interference during the design process, the piping needs to be bent, and the pipe connections are generally connected by nuts. The pipeline is usually connected by flame brazing, but there are very few pipelines where the bend is close to the welding place, and the welding nut cannot avoid the welding flame, such as Figure 6 As shown, the weld seam, the nut, and the bend are relatively close together. The flame cannot avoid burning the nut during welding, and the nut has an anodized layer on the single piece. Under the flame ablation of flame brazing, the anodized layer It will be destr...

AI Technical Summary

Problems solved by technology

[0002] Aeroengine piping is a common structure of engines, and the external piping system of aeroengines is complex and numerous. Therefore, in order to avoid interference during the design process, the piping needs to be bent, and the pipe connections are generally connected by nuts. The pipeline is usually connected by flame brazing, but there are very few pipelines where the bend is close to the welding place, and the welding nut cannot avoid the welding flame, such as Image 6 As shown, the weld seam, the nut, and the bend are relatively close together. The flame cannot avoid burning the nut during welding, and the nut has an anodized layer on the single piece. Under the flame ablation of flame brazing, the anodized layer Will be destroyed, and due to material reasons, it cannot be re-processed on the component, resulting in the part not being able to be processed to the design requirements

In order to protect the nut from being ablated, it is usually necessary to add protective tooling, but the design of the tooling is difficult. If the tooling is made of metal, the brazing solder will flow into the tooling because the tooling is close to the welding seam, and the tooling and parts will be welded to death and cannot be disassembled. If asbestos and other heat insulating materials are used as tooling, asbestos will pollute the weld due to the proximity of the tooling to the weld, resulting in unqualified welding

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