Production method of high-performance titanium alloy blind pipe

Abstract

The invention discloses a production method of a high-performance titanium alloy blind pipe. The production method comprises the following steps of: (a) coating a graphite coating on the surface of a core bar; (b) placing the core bar in a sheath cylinder and clamping the core bar at the centre of the sheath cylinder by using a core bar positioning tool; fixing the bottom end of the core bar on asheath bottom cover, and welding the sheath bottom cover at the bottom end of the sheath cylinder; and then filling titanium alloy powder into a cavity which is formed by the sheath cylinder and the core bar; (c) welding a sheath top cover at the top of the sheath cylinder, reserving a space for placing a degasification pipeline, and vacuumizing the sheath cylinder; (d) fixing both ends of a sheath in a sheath hot isostatic pressing tool, and carrying out a thermal isostatic pressing process; (e) taking out the sheath, fixing both ends of the sheath on a hydraulic machine, and drawing out thecore bar in the sheath; and (f) machining the core bar to obtain the titanium alloy blind pipe. According to the production method provided by the invention, because the core bar can be rapidly removed, the final size of the prepared high-performance thin and long titanium alloy blind pipe can be reached without machining an inner cavity, therefore, the production period is short, the yield is high, and the product performance and the internal quality are stable and reliable.

Description

technical field [0001] The invention relates to a method for manufacturing a titanium alloy slender dead leg, in particular to a rapid manufacturing method for a metal slender dead leg whose elongation exceeds 5% for titanium alloys, titanium-aluminum intermetallic compounds, etc., and the performance of the material At or close to the level of forgings. Background technique [0002] The support structure of the second-stage box section of the launch vehicle is large in size and has strict requirements on the space position. It is required that the slender blind pipes that constitute the support structure have the characteristics of light weight, good rigidity and stable performance. [0003] Titanium alloy is one of the commonly used structural materials in the field of aerospace. The titanium alloy blind tube is a key component of the stent structure. It has a slender shape and a length of 1 to 1.5 meters. In order to shorten the production cycle, common titanium alloy bl...

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Problems solved by technology

The disadvantage of this method is that the production cycle is long, the material utilization rate is low,

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