Machining technology of titanium alloy lightweight reinforced airfoil

Abstract

The invention discloses machining technology of a titanium alloy lightweight reinforced airfoil. The machining technology of the titanium alloy lightweight reinforced airfoil comprises the following steps that material preparing, feeding, sheet metal forming; cleaning; welding isolation agent coating, soldering and sealing, airtightness detecting, mold filling and superplastic forming / diffusion connection are carried out, specifically, a mold is placed in superplastic forming equipment, and the airfoil is subjected to vacuum pumping by 10<-2>10<-5>Pa, temperature is raised to 870-940 DEG C, pressurization of an outer layer air inlet is 1.2-1.5 MPa, heat preservation is carried out for 2-4H, superplastic forming of upper and lower cover plates is achieved, diffusion connection exists between an upper grid and an upper core plate, a lower grid and a lower core plate, the upper and lower core plates, pressurization of an inner air inlet 1-1.5 MPa, heat preservation is carried out for 2-4H, superplastic forming of the upper and lower core plates is achieved, a superplastic formed structure of the upper core plate is in diffusion connection with the upper grid and the upper cover plateseparately, a superplastic formed structure of the lower core plate is in diffusion connection with the lower grid and the lower cover plate separately, and furnace cooling is carried out; and finishing and polishing are carried out.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a processing technology for lightweight reinforced airfoil of titanium alloy. Background technique [0002] Superplastic forming / diffusion bonding (SPF / DB) technology has developed rapidly since the 1970s. It utilizes the excellent elongation and good diffusion properties of metal materials with specific microstructures in the high temperature range. , by applying appropriate pressure to make the bonded part of the material undergo diffusion connection, and the separated part undergoes superplastic forming, thereby forming an overall hollow structure. Using this technology can form a complex overall structure at one time, reduce a large number of riveting and welding assemblies, and reduce the weight of the structure. [0003] At present, the hollow and thin-walled structure of the airfoil structure mainly adopts casting forming, plate tailor welding, brazing technology...

AI Technical Summary

Problems solved by technology

[0003] At present, the hollow and thin-walled structure of the airfoil structure mainly adopts casting forming, plate tailor welding, brazing technology, 3D printing, etc., but in the actual production process, there are low material utilization rates, poor scale accuracy and overall rigidity when splicing multiple places. Poor, and the preparation process is complicated

[0004] Although the superplastic forming / diffusion bonding technology is very suitable for the forming of titanium alloy lightweight structures, for some parts with relatively thin skeleton wall thickness and very large airfoil thickness, and the skeleton has uneven wall thickness due to load-bearing requirements, the conventional process hard to accomplish

For the brazing process, there are problems such as small brazing surface and many weld seams, but the rigidity of the welded parts is poor, and the tooling is difficult to load.

However, electron beam welding needs to be carried out in a vacuum environment. For parts that need to be welded with multiple welds, the production cycle is very long and the cost is high.

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