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

A high-precision, small-caliber technology, used in manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of poor surface quality of pipes, unqualified test results, and incomplete elimination of internal stress, and achieve dimensional accuracy and Performance requirements, small and uniform material structure, and the effect of increasing the intermediate annealing temperature

Active Publication Date: 2020-08-07
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation specifications of this embodiment High-precision small-diameter TA2 pipes, the method specifically includes the following steps:

[0024] Step 1. Saw and cut the TA2 bar with a specification of Φ64mm×L according to the length of 200mm to 240mm to obtain a billet. Use a lathe to peel and drill the billet to obtain a hollow tube blank. The size of the tube blank after machining is Bar billet inner hole, outer circle chamfer (3~4)mm×45°;

[0025] Step 2. Hot-extrude the hollow tube blank in step 1, extrusion cylinder Φ65mm, extrusion die Φ22mm ±0.2 mm, extrusion needle 13 ±0.2 mm, extrusion speed 90mm / s, billet heating temperature 750°C, after extrusion, the pipe billet is straightened with residual heat until it rolls smoothly on the horizontal plane, and the specification of the pipe billet after extrusion is Φ22 ±0.2 ×4.5 ±0.2 mm;

[0026] Step 3. Surface treatment is carried out on the tube blank extruded in step 2 to remove the surface scale and res...

Embodiment 2

[0036] Preparation specifications of this embodiment High-precision small-diameter TA2 pipes, the method specifically includes the following steps:

[0037] Step 1. Saw and cut the TA2 bar with a specification of Φ64mm×L according to the length of 200mm to 240mm to obtain a billet. Use a lathe to peel and drill the billet to obtain a hollow tube blank. The size of the tube blank after machining is Both the inner hole and the outer round chamfer of the billet are (3~4)mm×45°;

[0038] Step 2. Hot-extrude the hollow tube blank in step 1, extrusion cylinder Φ65mm, extrusion die Φ22mm ±0.2 mm, extrusion needle 13 ±0.2 mm, extrusion speed 80mm / s, billet heating temperature 730°C, after extrusion, the pipe billet is straightened with waste heat until the horizontal plane rolls smoothly, and the pipe billet after extrusion has a specification of Φ22 ±0.2 ×4.5±0.2 mm;

[0039] Step 3. Surface treatment is carried out on the tube blank extruded in step 2 to remove the surface sca...

Embodiment 3

[0050] Preparation specifications of this embodiment High-precision small-diameter TA2 pipes, the method specifically includes the following steps:

[0051] Step 1. Saw and cut the TA2 titanium rod with a specification of Φ64mm×L according to the material length of 200mm to 240mm to obtain a billet. Use a lathe to peel and drill the billet to obtain a hollow tube blank. The size of the tube blank after machining is Both the inner hole and the outer round chamfer of the billet are (3~4)mm×45°;

[0052] Step 2. Hot-extrude the hollow tube blank in step 1, extrusion cylinder Φ65mm, extrusion die Φ22mm ±0.2 mm, extrusion needle 13 ±0.2 mm, extrusion speed 100mm / s, ingot heating temperature 770°C, after extrusion, the tube blank is straightened with waste heat until it rolls smoothly on the horizontal plane, and the specification of the tube blank after extrusion is Φ22 ±0.2 ×4.5 ±0.2 mm;

[0053] Step 3. Surface treatment is carried out on the tube blank extruded in step 2 ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C21D9/08C22F1/18
CPCB21C37/06C21D9/08C22F1/183
Inventor 张凯悦姚修楠蔡文博譙小瑜武宇张锟宇张录强
Owner 西安诺博尔稀贵金属材料股份有限公司
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