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

A technology with low oxygen content and forming method, which is applied in the direction of metal rolling, metal rolling, rolling mill control device, etc., can solve the problems of rolling technology, backward equipment, large thickness deviation, poor superplastic formability, etc., and achieve the production method Simple and easy to implement, uniform internal stress distribution, and good plastic formability

Active Publication Date: 2010-09-01
江苏呈飞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 suc

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The TC4 titanium alloy sheet with a thickness of 5mm is cold-rolled 2B surface as raw material, rolled by a 20-roll mill, degreased, bright annealed, secondary cold-rolled by a 20-roll mill, degreased, bright annealed, tension straightened, and slitting / Cross-cutting, inspection, packaging and warehousing and other processes are made. Among them, the surface roughness of the work rolls in the secondary cold rolling of the 20-high rolling mill is Ra0.50μm, and the pass deformation rate is 40%; the recrystallization annealing temperature is 850 ° C, the holding time is 15 minutes, the reducing atmosphere is protected, and the cooling is rapid; the stress is relieved The annealing temperature is 650°C, the holding time is 10 minutes, the reducing atmosphere is protected, and the cooling is rapid. The prepared low-oxygen aerospace titanium alloy precision thin sheet has no oxygen-enriched layer, α layer and other surface pollution layers on the surface, uniform internal st...

Embodiment 2

[0026] The TC4 titanium alloy sheet with a thickness of 3mm is cold-rolled 2B surface as raw material, rolled by a 20-roll mill, degreased, bright annealed, secondary cold-rolled by a 20-roll mill, degreased, bright annealed, tension straightened, and slitting / Cross-cutting, inspection, packaging and warehousing and other processes are made. Among them, the surface roughness of the work rolls in the secondary cold rolling of the 20-high rolling mill is Ra0.02μm, and the deformation rate of each pass is 50%; the recrystallization annealing temperature is 800 ° C, the holding time is 20 minutes, the reducing atmosphere is protected, and the cooling is rapid; the stress is relieved The annealing temperature is 550°C, the holding time is 15 minutes, protected by a reducing atmosphere, and cooled rapidly. The surface of the prepared low-oxygen aerospace titanium alloy precision sheet should not have any surface pollution layers such as oxygen-enriched layer and α layer, the intern...

Embodiment 3

[0028] The TA15 titanium alloy sheet with a thickness of 1mm is used as a raw material, and it is rolled by a 20-roller mill, degreased, bright annealed, twice cold-rolled by a 20-roller mill, degreased, bright annealed, tension straightened, and slitting / Cross-cutting, inspection, packaging and warehousing and other processes are made. Among them, the surface roughness of the work rolls in the secondary cold rolling of the 20-high rolling mill is Ra0.20μm, and the pass deformation rate is 65%; the recrystallization annealing temperature is 700 ° C, the holding time is 30 minutes, the reducing atmosphere is protected, and the cooling is rapid; the stress is relieved The annealing temperature is 500°C, the holding time is 20 minutes, the reducing atmosphere is protected, and the cooling is rapid. The surface of the prepared low-oxygen aerospace titanium alloy precision sheet should not have any surface pollution layers such as oxygen-enriched layer and α layer, the internal st...

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Abstract

The invention discloses a method for rolling and molding a low-oxygen content aero titanium alloy precision sheet. Tthe 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...

Claims

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Application Information

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IPC IPC(8): B21B1/30B21B37/00C21D9/46
Inventor 朱建平陶杰汪涛周海龙金宇龙
Owner 江苏呈飞新材料科技有限公司
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