Method for preparing high-precision small-caliber TA2 pipe for spaceflight

Abstract

The invention provides a method for preparing a high-precision small-caliber TA2 pipe for spaceflight. The method for preparing the high-precision small-caliber TA2 pipe for the spaceflight comprisesthe following steps that 1, blanking and sawing, peeling and drilling are conducted on a TA2 bar to obtain a hollow pipe blank; 2, hot extrusion is performed on the hollow pipe blank; 3, surface treatment is performed on the pipe blank subjected to the hot extrusion; 4, annealing treatment is performed on the pipe blank subjected to the surface treatment; 5, the annealed pipe blank is subjected tomulti-roller cold rolling till the TA2 pipe with the final required size is obtained through the rolling; 6, finished product annealing treatment is conducted on the TA2 pipe which completes the coldrolling; and 7, straightening and head cutting are conducted on the TA2 pipe subjected to the finished product annealing, and a high-precision small-caliber TA2 pipe finished product is obtained after finishing. The high-precision small-caliber TA2 pipe prepared through the method has good comprehensive performance, the ultrasonic flaw detection qualification rate of the pipe is high, the inner and outer surface are smooth and free of defects, and the using requirement of the liquid rocket engine TA2 pipe can be met.

Description

technical field [0001] The invention belongs to the technical field of processing and manufacturing rare metal TA2 pipes, and in particular relates to a method for preparing high-precision small-diameter TA2 pipes for aerospace. Background technique [0002] As an important component of launch vehicles, liquid rocket engines are of great strategic significance to the development of my country's aerospace industry. The pipes used in the engine need to have good comprehensive performance and high dimensional accuracy before they can be used. Compared with nickel-based alloys and stainless steel, TA2 pipes have higher specific strength, lower metal density, excellent heat resistance and corrosion resistance, and are suitable as small-diameter pipes for liquid rocket engines. The size specification of high-precision small-diameter TA2 pipes required by the engine is (Φ8~Φ6)mm×(0.8~1.5)mm, and the dimensional accuracy range is (0~0.05)mm is more common. Cracks and peeling are no...

AI Technical Summary

Problems solved by technology

Due to the small size and high precision requirements of the TA2 pipes currently required, the total processing rate of the traditional cold-rolled annealing room is high, the yield strength is relatively large, and the intermediate annealing temperature is low, resulting in poor plasticity of the material, and the elongation rate is generally 15% to 18%. In the subsequent continuous rolling process, it is easy to cause work hardening of the pipe, and the internal stress cannot be completely eliminated. Therefore, after multiple passes of rolling, there are many tiny cracks inside the pipe that cannot be observed by the naked eye, and the surface is accompanied by scratches, Defects such as peeling and pinholes will lead to cracking of the pipe in severe cases

Due to the poor surface quality of the pipes, the test results of TA2 pipes in the ultrasonic flaw detection process were unqualified, the flaw detection noise exceeded 40%, and the pipe waste rate was as high as 90%.

Therefore, the TA2 pipe prepared by the traditional process cannot be used as a liquid rocket engine pipe

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