Method for rolling and molding low-oxygen content aero titanium alloy precision sheet

Abstract

The invention discloses a method for rolling and molding a low-oxygen content aero titanium alloy precision sheet. The low-oxygen content aero titanium alloy precision sheet is obtained by rolling twice by using a twenty high rolling mill. The method comprises the following steps of: rolling by using the twenty high rolling mill, degreasing, recrystallization annealing, cold rolling with the twenty high rolling mill again, degreasing, stress relief annealing, stretcher leveling, longitudinal cutting / transverse cutting, inspecting, packaging, and the like, wherein aero titanium alloy plates, such as TC4, TA15 and the like, with the thickness of 1-5 mm, are used as raw materials. The thickness tolerance of the titanium alloy precision sheet is + / -0.005 mm, the camber is 0.3-1 mm / 1m, the surface quality is No.2B, the surface smoothness is up to 1-2 I-Unit, the grain size is up to 5-6 grades, the surface has no surface contamination layer (such as an oxygen-enriched layer, an alpha layer and the like), the internal stress is distributed uniformly, no anisotropy exists, and the subsequent plastic forming feature is favorable. The invention has the advantages of easy production method, low cost, high product quality and high production efficiency.

Description

technical field [0001] The invention relates to a rolling processing method of aviation titanium alloy precision thin plate, in particular to a rolling forming method of low oxygen content aerospace titanium alloy precision thin plate. Background of the invention [0002] In order to ensure that the aircraft body structure has sufficient strength and rigidity, and to reduce the structural mass, materials with high specific strength and specific stiffness are usually used. In terms of airframe structural materials, advanced composite materials are listed as the four major structural materials together with aluminum alloys, high-strength steels, and titanium alloys. Due to its high strength, light weight, high damage tolerance and good corrosion resistance, titanium alloy has always been an ideal metal material to replace steel in aircraft structures. With the increase of the speed of the aircraft, the application of titanium alloys on the airframe has increased significantly...

AI Technical Summary

Problems solved by technology

[0004] Due to the poor rolling performance of aerospace titanium alloy materials, coupled with the backward rolling technology and equipment of domestic manufacturers, domestic aviation titanium alloys with a thickness of ≤1mm (especially below 0.8mm) are produced by the multi-fire hot rolling and cladding rolling process. There is a large quality gap between thin plates and similar foreign products, and there are common shortcomings such as high surface oxygen content, poor microstructure, low surface flatness, and large thickness deviation.

In the subsequent forming process of titanium alloy components, thin sheet metal / coiled tubes, poor welding performance, poor superplastic formability, and poor fatigue strength are often caused, which makes it difficult to control the dimensional accuracy of aerospace titanium alloy components such as aircraft and missiles. problem

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