A method for preparing intermediate case by hot isostatic pressing powder metallurgy
A hot isostatic pressing and powder metallurgy technology, applied in mechanical equipment, engine components, etc., can solve the problems of low tensile strength and fatigue strength at welds, inability to achieve forming by casting and forging processes, and unreasonable welding structures. Improve structural strength and fatigue strength, good control of internal defects, good dimensional stability
Active Publication Date: 2020-04-10
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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The second is that the force is very complicated. As the main load-bearing frame, the intermediate casing bears the aerodynamic load when the engine is working and the maneuvering load (that is, external force and gyro moment) during maneuvering flight. Since there are many installation sides, it acts on each The number of two types of loads on the site is relatively large, almost involving the calculation of the axial force of each rotor and stator components and the calculation of the maneuvering load within the envelope of the external force.
[0003] Not only is the structure complex, but in order to achieve further weight reduction, the overall thickness of the new intermediary casing is mostly less than 2mm, and the traditional casting and forging process cannot be formed. At present, the argon arc welding process is mostly used, and the welding cycle is very long and the yield is low.
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[0028] A new type of turbofan engine is the power plant of a new type of fighter jet in my country. Its application prospect is very broad and its strategic significance is great. The material of this type of intermediate casing is TA15 titanium alloy, which has a three-layer structure from the inside to the outside, such as figure 1 As shown, the inner layer is a K-shaped inner casing, the middle layer of splitter ring is a semi-closed V-shaped, and the outer casing has three mounting sides and mounting seats of different shapes, and the load-bearing support plates are evenly arranged. The thickness of the product varies, the thinnest part is only 1.2mm, and the thickness of most other parts is between 1.5 and 3.5mm. Taking this type of engine powder metallurgy intermediary casing as an example, the method of preparing the intermediary casing by hot isostatic pressing powder metallurgy is described.
[0029] (1) The structure of this type of intermediary casing includes a K-...
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Abstract
The invention relates to a method for preparing an intermediate casing by hot isostatic pressing powder metallurgy, and belongs to the technical field of thin-wall complex titanium alloy component manufacturing. The intermediate casing component prepared by the method of the invention has uniform structure and performance, small internal stress, good dimensional stability, good internal defect control, short development period and high material utilization rate. Realizing the one-time forming of most structures of the intermediary casing, greatly reducing the welding positions, and improving the structural strength and fatigue strength of the intermediary casing will strongly promote the development of a new generation of aero-engines, and will also provide a new foundation for my country's future aviation weapons and equipment. The required higher performance aero-engine development lays the foundation for materials and process technology.
Description
technical field [0001] The invention relates to a method for preparing an intermediate casing by hot isostatic pressing powder metallurgy, which belongs to the technical field of manufacturing thin-walled complex titanium alloy components, and is especially aimed at the near-net shape control of the thin-walled complex integral intermediate casing. Background technique [0002] The titanium alloy intermediary casing is the most complicated casing component in the turbofan aero-engine, and it is also one of the load-bearing parts of the engine. Generally, the intermediate casing has the following two characteristics: First, the structure is very complicated. The intermediate casing is located between the fan and the outer ducted casing, and is composed of the inner and outer casings, the load-bearing support plate and the splitter ring. The front and rear of the outer casing are respectively connected with the fan casing and the outer channel casing, and the lower part is equ...
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IPC IPC(8): B22F3/15B22F3/00B22F5/00
CPCB22F3/004B22F3/15B22F5/008
Inventor 张海洋阴中炜王亮徐桂华
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH