CN103143678A - Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade - Google Patents
Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade Download PDFInfo
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- CN103143678A CN103143678A CN2013101106954A CN201310110695A CN103143678A CN 103143678 A CN103143678 A CN 103143678A CN 2013101106954 A CN2013101106954 A CN 2013101106954A CN 201310110695 A CN201310110695 A CN 201310110695A CN 103143678 A CN103143678 A CN 103143678A
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Abstract
The invention provides a formwork for optimizing a directional columnar crystal structure of a high-temperature alloy blade, and the formwork is used in a directional solidification device. Seeding columns are arranged between the bottom of a protruded part of a blade edge plate on the formwork and the top of a water-cooled chassis in a crystal growth direction, cavities are formed inside the seeding columns and are communicated with an inner cavity of the formwork, and a plurality of seeding columns are uniformly arranged in parallel and correspond to the cross section of the protruded part of the blade edge plate. According to the formwork disclosed by the invention, by virtue of a directional column crystal seeding technology, the high-temperature alloy blade produced by a directional solidification technology has a columnar crystal structure which grows axially; and as a harmful transverse crystal boundary is eliminated, high-temperature performance is obviously improved in comparison with an isometric crystal structure produced by a common precision casting method. After pouring, the seeding columns can be used for transferring heat of the edge plate vertically downwards, and simultaneously, the directional solidification process inside the columns can extend to the inside of the edge plate, so that the good columnar crystal structure is also formed in the edge plate.
Description
Technical field
The present invention relates to the hot investment casting of high-temperature alloy part, specifically be used for a kind of formwork of optimizing its directional columnargrain tissue of high temperature alloy single crystal blade manufacturing.
Background technology
As shown in Figure 1, when making the high-temperature alloy blades of directional solidification columnar structure, need to carry out in the device for directionally solidifying of special use.At first, ceramic shell mould 1 is placed on water-cooled chassis 5, then more than heater is preheating to the alloy high-temp alloy with it; Then, pour into the high temperature alloy melt 2 after fusing in the ceramic shell mould 1, at first the Quench that the high temperature alloy melt 2 of the bottom of ceramic shell mould 1 is subject to water-cooled chassis 5 solidifies.Enter cooling zone along with heat spreads out of to descend with ceramic shell mould 1 downwards, the high temperature alloy melt 2 in ceramic shell mould 1 is directional solidification from bottom to top, and the crystal grain of high-temperature alloy casting 3 is oriented growth from bottom to top, forms the columanar structure of capwise.
But in the listrium part of blade, become large because the cross section of high-temperature alloy casting 3 is horizontal suddenly, heat can not spread out of vertically downward, and directional solidification is destroyed, thereby generates thick external stray crystal crystal grain 4-1 and 4-2.The external stray crystal crystal grain 4-1 of these listriums part and 4-2 coarse grains, crystal orientation are bad, destroyed the blade capwise columanar structure, its performance is had a strong impact on; Even also can obliquely the grow into blade blade part of high-temperature alloy casting 3 of external stray crystal crystal grain 4-1 and 4-2 causes larger impact.The large-scale blade used of heavy combustion engine particularly, external stray crystal crystal grain 4-1 and the 4-2 at listrium position are especially obviously outstanding, and problem is even more serious.
Summary of the invention
The object of the invention is to: a kind of formwork for optimizing high-temperature alloy blades directional columnargrain tissue is provided, can makes blade edge board position form desirable columnar structure.
The technical solution adopted in the present invention is:
A kind of formwork for optimizing high-temperature alloy blades directional columnargrain tissue, use in device for directionally solidifying, be provided with the seeding post between bottom, blade listrium protuberance position on described formwork and water-cooled chassis top, this seeding post is along the crystal growth direction setting, there is cavity seeding post inside, and the internal cavities of seeding post and the perforation of formwork internal cavities.
Described seeding post is some, and the cross section of corresponding blade listrium protuberance position evenly arranges, is parallel to each other.
The beneficial effect that the present invention produces is:
Formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention, adopt directional columnargrain seeding, utilize the high-temperature alloy blades that directional solidification processes is produced to have the columnar structure of growth vertically, owing to having eliminated harmful transverse grain boundaries, equiaxed grain structure that high-temperature behavior is produced compared with common casting method has had and has significantly improved.
According to the present invention, between listrium ledge and water-cooled chassis, the seeding post of some and respective shapes in interpolation.As the extention of foundry goods, the seeding post must be stained with corresponding wax bar when the assembling wax-pattern, drenches sand by mucilage and makes formwork, forms cavity after dewaxing.After cast, the seeding post plays a part the heat of listrium is spread out of vertically downward, and the directional solidification process in post can be extended in listrium simultaneously, makes listrium also form good columnar structure.
Description of drawings
Fig. 1 is the directional solidification processes schematic diagram of existing high-temperature alloy blades;
Fig. 2 is the directional solidification processes schematic diagram of high-temperature alloy blades of the present invention.
Number in the figure represents: 1, ceramic shell mould, 2, the high temperature alloy melt, 3, high-temperature alloy casting, 4, external stray crystal crystal grain, 5, water-cooled chassis, 6, columanar structure, 7, the seeding post.
The specific embodiment
As shown in Figure 2, the present invention is a kind of formwork for optimizing high-temperature alloy blades directional columnargrain tissue, uses in device for directionally solidifying, and in this specific embodiment, formwork is ceramic shell mould 1.The seeding post 7 of some and respective shapes is set between the bottom, blade listrium protuberance position on formwork (ceramic shell mould 1) and water-cooled chassis 5 tops.Seeding post 7 is along the crystal growth direction setting, and seeding post 7 forms cavity in formwork, with the internal cavities perforation of formwork (ceramic shell mould 1).According to the growth needs of high-temperature alloy casting 3, seeding post 7 can be made into cylindricality, piece shape or plate shape, also can be made into the slice shape of a plurality of dispersions or bunchy, so that the shell process processed of formwork of the present invention (mucilage pouring sand) is as far as possible few influenced.Some, seeding post 7, the cross section of corresponding blade listrium protuberance position evenly arranges, is parallel to each other.
In this specific embodiment, with the fusing after high temperature alloy melt 2 be cast in ceramic shell mould 1 interior after, seeding post 7 plays a part the heat of blade listrium protuberance position is spread out of vertically downward, simultaneously the directional solidification process of seeding post 7 internal cavities can be extended to blade listrium protuberance position, makes blade listrium protuberance position also form good columanar structure 6.Concrete: when using the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention to carry out the directional solidification of high temperature alloy, from water-cooled chassis 5, orientation grown crystal cast bar equably from bottom to up in the internal cavity of seeding post 7-1 and 7-2, and extend to ceramic shell mould 1 inside of blade listrium protuberance position, make the high-temperature alloy casting 3 of blade listrium protuberance position good for the crystal orientation, crystal grain is little and uniform directional solidification columanar structure 6.
The preparation method of the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention is very simple, and committed step is the wax-pattern assembling procedure, and is specific as follows:
At first, with corresponding seeding wax post, insert between the listrium and base plate of the blade wax-pattern that has assembled.At this moment, should guarantee that the listrium place obtains desirable columnar structure, also will consider machined surface and cutting problem.Seeding post 7 is as the extention of ceramic shell mould 1, must be when the assembling wax-pattern, the wax bar of use and seeding post 7 same sizes is bonded on the blade wax-pattern.
Then, make formwork (be stained with slurry, drench sand, dewaxing, sintering) according to common fine casting method, can obtain the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention.Concrete, the wax bar of seeding post 7 drenches sand by mucilage makes formwork, forms the cavity of seeding post 7 after dewaxing.
Formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention before using, first preheating and be incubated roasting in vacuum drying oven, and then use heat conduction formwork carries out cast and the directional solidification of high-temperature metal alloys sample.
Use method that the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention carries out directional solidification identical with the directional solidification processes of general high-temperature alloy blades, just when cleaning high-temperature alloy casting 3, seeding post chamber need to be formed the excision of crystal cast bar.
Claims (2)
1. formwork of be used for optimizing high-temperature alloy blades directional columnargrain tissue, use in device for directionally solidifying, it is characterized in that: be provided with the seeding post between the bottom, blade listrium protuberance position on described formwork and water-cooled chassis top, this seeding post is along the crystal growth direction setting, there is cavity seeding post inside, and the internal cavities of seeding post and the perforation of formwork internal cavities.
2. the formwork for optimizing high-temperature alloy blades directional columnargrain tissue according to claim 1, it is characterized in that: described seeding post is some, the cross section of corresponding blade listrium protuberance position evenly arranges, is parallel to each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310110695.4A CN103143678B (en) | 2013-04-01 | 2013-04-01 | Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade |
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| CN201310110695.4A CN103143678B (en) | 2013-04-01 | 2013-04-01 | Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade |
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| CN103143678A true CN103143678A (en) | 2013-06-12 |
| CN103143678B CN103143678B (en) | 2015-02-18 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894546A (en) * | 2014-03-26 | 2014-07-02 | 东方电气集团东方汽轮机有限公司 | Precision casting method for complex casting with concave-convex end |
| CN103894547A (en) * | 2014-03-26 | 2014-07-02 | 东方电气集团东方汽轮机有限公司 | Precision casting method of blade casting with margin plate |
| CN104289674A (en) * | 2014-10-24 | 2015-01-21 | 东方电气集团东方汽轮机有限公司 | Precision casting method for column crystal guide vanes of gas turbine |
| CN104353785A (en) * | 2014-10-31 | 2015-02-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Inlaid base disc for directionally freezing blade wax mold combination and preparing method thereof |
| CN104399894A (en) * | 2014-12-15 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Wax tree structure applied to formation of high-temperature alloy single-crystal guide vane |
| CN104826983A (en) * | 2015-04-08 | 2015-08-12 | 北京仁创科技集团有限公司 | Alkaline phenolic resin old sand and regeneration method thereof |
| CN105057589A (en) * | 2015-07-16 | 2015-11-18 | 西安航空动力股份有限公司 | Method for increasing number of directionally solidified blade column crystals |
| CN106734907A (en) * | 2016-11-25 | 2017-05-31 | 中航动力股份有限公司 | A kind of directional solidification cylindrulite and single crystal blade casting method |
| CN106734852A (en) * | 2016-12-22 | 2017-05-31 | 中国科学院金属研究所 | A kind of anti-sticking tin liquid metal cools down the preparation method of directional solidification ceramic shell |
| CN107983911A (en) * | 2017-12-06 | 2018-05-04 | 安徽应流航源动力科技有限公司 | A kind of method for the position crystallite dimension that become larger suddenly using the thick big position of wax-pattern structure preparation improvement orientation casting or section |
| CN113976824A (en) * | 2021-10-20 | 2022-01-28 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of core of conjoined single crystal guide blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894547B (en) * | 2014-03-26 | 2016-03-23 | 东方电气集团东方汽轮机有限公司 | With the casting method of listrium Blade roughcast |
| CN103894547A (en) * | 2014-03-26 | 2014-07-02 | 东方电气集团东方汽轮机有限公司 | Precision casting method of blade casting with margin plate |
| CN103894546A (en) * | 2014-03-26 | 2014-07-02 | 东方电气集团东方汽轮机有限公司 | Precision casting method for complex casting with concave-convex end |
| CN103894546B (en) * | 2014-03-26 | 2016-03-23 | 东方电气集团东方汽轮机有限公司 | The casting method of the concavo-convex intricate casting in end |
| CN104289674A (en) * | 2014-10-24 | 2015-01-21 | 东方电气集团东方汽轮机有限公司 | Precision casting method for column crystal guide vanes of gas turbine |
| CN104353785A (en) * | 2014-10-31 | 2015-02-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Inlaid base disc for directionally freezing blade wax mold combination and preparing method thereof |
| CN104399894A (en) * | 2014-12-15 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Wax tree structure applied to formation of high-temperature alloy single-crystal guide vane |
| CN104826983A (en) * | 2015-04-08 | 2015-08-12 | 北京仁创科技集团有限公司 | Alkaline phenolic resin old sand and regeneration method thereof |
| CN105057589A (en) * | 2015-07-16 | 2015-11-18 | 西安航空动力股份有限公司 | Method for increasing number of directionally solidified blade column crystals |
| CN105057589B (en) * | 2015-07-16 | 2017-05-17 | 西安航空动力股份有限公司 | Method for increasing number of directionally solidified blade column crystals |
| CN106734907A (en) * | 2016-11-25 | 2017-05-31 | 中航动力股份有限公司 | A kind of directional solidification cylindrulite and single crystal blade casting method |
| CN106734907B (en) * | 2016-11-25 | 2018-11-30 | 中航动力股份有限公司 | A kind of directional solidification cylindrulite and single crystal blade casting method |
| CN106734852A (en) * | 2016-12-22 | 2017-05-31 | 中国科学院金属研究所 | A kind of anti-sticking tin liquid metal cools down the preparation method of directional solidification ceramic shell |
| CN106734852B (en) * | 2016-12-22 | 2019-05-21 | 中国科学院金属研究所 | A kind of preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal |
| CN107983911A (en) * | 2017-12-06 | 2018-05-04 | 安徽应流航源动力科技有限公司 | A kind of method for the position crystallite dimension that become larger suddenly using the thick big position of wax-pattern structure preparation improvement orientation casting or section |
| CN113976824A (en) * | 2021-10-20 | 2022-01-28 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of core of conjoined single crystal guide blade |
| CN113976824B (en) * | 2021-10-20 | 2023-09-15 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of conjuncted single crystal guide blade core |
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