Method using 0 chromium (Cr) 17 nickel (Ni) 4 copper (Cu) 4 niobium (Nb) thin wall square pipes to machine and manufacture linkage ring guide pipe parts

Abstract

The invention belongs to the field of machining and particularly relates to a method using 0 chromium (Cr) 17 nickel (Ni) 4 copper (Cu) 4 niobium (Nb) thin wall square pipes to machine and manufacture linkage ring guide pipe parts. The method is characterized in that the 0 Cr 17 Ni 4 Cu 4 Nb thin wall square pipes with 0.6 + / - 0.03 millimeter wall thickness are used as pipe materials, after burrs are removed, rosin or sand is poured into the pipe materials which are disposed in a roll bending forming mould to be molded in a roll bending mode, the rosin or the sand in the pipe materials is removed after the pipe materials are molded in a roll bending mode, and the pipe materials are disposed on a shape rectifying mould to be rectified for 2-4 hours, and then ports of the pipe materials are cut off, after the pipe materials are in fluoroscopy examination, a heat treatment of the pipe materials at temperature of 1030-1050 DEG D under a vacuum condition for 10-30 minutes is carried out, then the pipe materials are disposed on the shape rectifying mould again to be rectified for 2-4 hours, after the pipe materials are in end cutting and the fluoroscopy examination after being rectified, the linkage ring guide pipe parts can be obtained. The technical scheme fully solves the problems that precipitation hardening type martensitic stainless steel 0 Cr 17 Ni 4 Cu 4 Nb thin wall square pipes are low in plasticity and difficult to machine, and the linkage ring guide pipe parts which meet requirements of aero-engine use are manufactured and machined.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a method for manufacturing linkage ring conduit parts by using 0Cr17Ni4Cu4Nb thin-walled square tubes. Background technique [0002] At present, the linkage ring guides of domestic aero-engines are mostly made of titanium alloy ring forgings. The main problems are that the weight of the engine is significantly increased, and the specific strength of titanium alloy is low. The structure of precipitation hardening martensitic stainless steel 0Cr17Ni4Cu4Nb is characterized by austenite plus ferrite with a volume fraction of 5% to 20% in the solid solution or annealed state. This steel has undergone a series of heat treatment or mechanical deformation treatment. After the austenite is transformed into martensite, and then through aging precipitation hardening to achieve the required high strength, it can be used as an ultra-high-strength material in the nuclear indust...

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Problems solved by technology

[0002] At present, the linkage ring ducts of domestic aero-engines are mostly made of titanium alloy ring forgings. The main problems are that the weight of the engine is very obvious, and the specific strength of titanium alloy is low.

[0003] However, the linkage ring conduit of an aero-engine is a thin-walled pipe part with a curved shape, which requires high dimensional accuracy and is very difficult to manufacture, and the cryogenic processing performance of the precipitation-hardening martensitic stainless steel 0Cr17Ni4Cu4Nb thin-walled square pipe is poor. Traditional pipes The bending forming process is to directly bend the pipe after filling it with sand. This method is suitable for ordinary austenitic pipes with low strength such as 1Cr18Ni9Ti (annealed tensile strength Rm is about 600MPa and elongation A is about 50%). It can meet the demand, but for materials such as 0Cr17Ni4Cu4Nb with high strength and low plasticity (the annealed Rm is about 1000MPa, and the elongation A is only about 10%), the traditional processing and molding process cannot guarantee the shape of the part

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