Forming method of titanium alloy oil tank shell

Abstract

The invention belongs to the field of precise panel machining, and discloses a forming method of a titanium alloy oil tank shell. The forming method comprises the following steps that firstly, the shape of an unfolded material of a component is calculated according to the theoretical diameter of the neutral plane of the titanium alloy oil tank shell, blanking is carried out in the direction of fiber of a rolled blank, and a panel material is obtained; secondly, the cold roll bending diameter of the oil tank shell is determined according to the structural parameters of a cold roll machine; thirdly, roll bending forming is carried out on the panel material through the cold roll machine according to the cold roll bending diameter of the oil tank shell; fourthly, butt welding is carried out on the panel material formed through roll bending; and fifthly, thermal correcting and stabilizing processing are carried out on a cylindrical piece formed through welding. The technology allowance and machining procedures needed by the thermal forming technology are greatly saved through unfolded material calculation, drive wheel pressing displacement compensation calculation, electron beam butt welding and the composite technology of thermal correcting and stabilizing processing; and according to the precise forming technology of the whole oil tank shell, the production efficiency is greatly improved, and the producing and manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the field of precision sheet metal processing, and relates to a forming method of a titanium alloy fuel tank shell, which is mainly used in the precision forming of a straight cylindrical titanium alloy fuel tank shell. Background technique [0002] Titanium and titanium alloys are excellent engineering structural materials. As their usage increases year by year, they are used more and more in the processing and manufacturing of various engineering structures and equipment. Due to the high strength of titanium alloy, relatively poor plasticity, large processing deformation resistance, narrow deformation range, and the inherent characteristics of titanium alloy such as small elastic modulus and large rebound, it is difficult to form and process. If the method is improper or the process is unreasonable, It often causes the workpiece to fail to meet the technical requirements, or even to be scrapped. Therefore, for most workpiece...

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Problems solved by technology

However, the power consumption, mold cost, labor cost and production efficiency of the hot forming process are much higher than those of the cold forming process.

[0003] At present, the cold roll forming process at room temperature is generally suitable for steel and aluminum parts, and it is rarely used in titanium alloy materials, because there are low-plastic near-α phase and α-β phase titanium alloys (such as TA15, TC4, etc.) High elasticity, low rigidity, poor thermal conductivity, high hardness, etc., are prone to problems such as cold rolling cracks and inaccurate cold rolling radius in the process of cold rolling

With the continuous improvement of the flight speed of rockets and missiles in the aerospace field, the application of titanium alloy fuel tank shells continues to expand. However, the forming process of titanium alloy fuel tank shells is relatively complicated at present, and hot forming process / machining / longitudinal seam welding / Composite forming process of heat correction, high manufacturing cost and long turnaround period

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