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A kind of whole blisk with double crystal structure and its manufacturing method
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A technology of integral blisk and organization, applied in the field of manufacturing, can solve the problems of easy failure and poor fatigue resistance of the whole blisk, and achieve the effects of good fatigue resistance, poor fatigue resistance and good creep performance.
Active Publication Date: 2021-08-10
NANCHANG HANGKONG UNIVERSITY
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[0005] The invention provides an integral blisk with twin-crystal structure and a manufacturing method thereof. In the integrated blisk provided by the invention, the blisk has a fine equiaxed crystal structure, the blade has a thick columnar crystal structure, and the boss has a The gradually larger transition crystal structure and the transition crystal structure of the boss effectively solve the problem of poor fatigue resistance and easy failure of the overall blisk caused by the mismatch of crystal structure between the disc and the blade
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preparation example Construction
[0045] In the present invention, the preparation method of the roulette with equiaxed crystal structure preferably includes:
[0046] machining the alloy after casting to obtain a wheel disc with an equiaxed crystal structure;
[0047] Alternatively, the alloy is forged and machined to obtain a wheel disc with an equiaxed crystal structure;
[0048] Alternatively, alloypowdermetallurgy can be used to obtain a disc with an equiaxed grain structure.
[0049] The present invention has no special requirements on the specific implementation method of obtaining the roulette with equiaxed crystal structure by machining the alloy after casting, and the methods well known to those skilled in the art can be used.
[0050] The present invention has no special requirements on the specific implementation method of obtaining the wheel disc with equiaxed grain structure by machining the alloy after forging, and the methods well known to those skilled in the art can be used.
[0051] In the...
Embodiment 1
[0075] (1) Preparation of equiaxed crystal discs
[0076] The GH4169 alloy powder is sintered to obtain a preformed disc, and the sintering temperature is 1150°C; the preformed disc is heated to 1080°C in a high-temperature furnace and then forged in a forging die. After hot forging, the relative density of the material can reach more than 99%, and the wheel disk can obtain a uniform equiaxed grain structure, and the average grain size of the equiaxed grain structure is 20 μm.
[0078] A boss with a rounded corner transition feature is processed on the wheel disc with an equiaxed grain structure by wire cutting in the traditional machining method. The height of the boss is 5mm, and the length and width of the boss are at the same position as the hub. The size of the blade is equivalent, and the upper surface of the boss is milled flat.
[0080] Wrap the wheel disc with asbestos heat insulating clot...
Embodiment 2
[0091] (1) Preparation of equiaxed crystal discs
[0092] Use TC4 titanium alloy powder to press into the required shape under the pressure of 400MPa. Afterwards, sintering is carried out in a high-temperature furnace or a vacuum furnace with a protective atmosphere. The sintering temperature is 1200 ° C, and the sintering time is 2 hours. Through the process, a roulette with an equiaxed grain structure is finally obtained, and the average grain size of the equiaxed grain structure is 25 μm.
[0094] Through traditional machining, a boss with rounded transition features is processed on the wheel disc with equiaxed grain structure. The height of the boss is 5mm, and the length and width of the boss are at the same position as the blade of the hub. The size is equivalent, and the upper surface of the boss is milled flat;
[0096] Wrap the wheel disc with asbestos heat insulating cloth to expose the ...
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Abstract
The present invention relates to the field of manufacturing technology, and provides an integral blisk with a double crystal structure, the integral blisk includes a disc, a boss and a blade; the inner side of the boss is connected to the wheel disc, and the outer side of the boss is connected to the wheel disc. The blades are connected; the disk has an equiaxed grain structure; the blade has a columnar grain structure; and the boss has a grain structure that gradually becomes larger from the inside to the outside. The boss in the integral blisk provided by the present invention has a grain structure that gradually becomes larger from the inside to the outside, which plays a transitional role between the fine equiaxed crystals and the thick columnar crystals in the disk and the blade, and avoids the grain structure of the blade and the disk. The huge difference leads to a sudden change in the mechanical properties of the overall blisk, and can effectively solve the problems of poor fatigue resistance and easy failure of the overall blisk. In addition, the disc in the present invention has a fine equiaxed grain structure, which is beneficial to make the whole blisk have good fatigue resistance; the blade has the characteristics of directional solidification structure of columnar crystal, so that the whole blisk still has good creep at high temperature performance.
Description
technical field [0001] The invention relates to the field of manufacturing technology, in particular to an integral blisk with twin crystal structure and a manufacturing method thereof. Background technique [0002] The blisk technology is one of the core technologies for the new generation of aero-engines to achieve structural innovation and technological leapfrogging. It integrates the engine rotor blades and the disc, which reduces the tenon airflow loss and improves the starting efficiency on the basis of simplifying the traditional aero-engine manufacturing process. Compared with the traditional structure, it has the advantages of weight reduction, grade reduction, efficiency enhancement and reliability improvement. [0003] At present, the manufacturing methods of blisks mainly include precision milling, precision welding, and integral precision casting. Among them, the precision washing process mainly relies on the complex CNC machining center to realize the direct ...
Claims
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