CN105108061A - Method of eliminating stray grain defect in single crystal blade - Google Patents
Method of eliminating stray grain defect in single crystal blade Download PDFInfo
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- CN105108061A CN105108061A CN201510635959.7A CN201510635959A CN105108061A CN 105108061 A CN105108061 A CN 105108061A CN 201510635959 A CN201510635959 A CN 201510635959A CN 105108061 A CN105108061 A CN 105108061A
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Abstract
A method of eliminating the stray grain defect in a single crystal blade comprises the following steps that seeding bars are pasted on a blade wax pattern when a wax tree is assembled, the seeding bars are utilized to connect the lower end of a blade with corners of a listrium at the upper middle part of the blade, so that by using a regular single crystal blade investment casting method, single crystals grown out from a crystallizer not only directly upward enter a blade body of the blade during directional solidification, but also enter the corners of the listrium through the seeding bars from a side face, then converge with ontological single crystals at the blade body, thus a whole casting grows into a single crystal structure, and the corners of the listrium are prevented from the situation that the nucleation of stray grains develop growth resulted from isolated overcooling. By adopting the method provided by the invention, the stray grain defect caused by horizontal propagation at the corners of the listrium of the single crystal blade can be greatly lessened, so that the single crystal yield of the blade is remarkably improved.
Description
Technical field
The present invention relates to single crystal casting founding, specifically, is a kind of method eliminating stray crystal defect in single crystal blade.
Background technology
In order to improve the efficiency of aero-engine and heavy duty gas turbine as far as possible, single crystal turbine blade obtains increasing application.Single crystal blade needs to adopt Investment casting technology, first suppresses, assembles wax tree, is then stained with slurry pouring sand and makes ceramic shell mould, after dewaxing roasting, pour into a mould and directional solidification in vacuum drying oven.High temperature alloy liquation pours into after in ceramic shell mould, and the Quench crystallization through bottom water-cooled copper dish is also upwards grown up, and grown gradually to blade root 1 by blade tip, the crystal selector 5 through narrow curved is selected, and finally only has a crystal grain to grow and enters blade 3 part.Blade 3 shape matching is simple, and in process of setting, cross section is without unexpected change, and curing condition is stablized, and is beneficial to the continuous growth of monocrystal, general little generation stray crystal defect.But have unexpected expansion at blade 3 and the junction cross section of listrium 2, the listrium 2(of the shape that occurred even having a down dip in level is as Fig. 1).Listrium 2 edge is premature solidification due to too fast cooling, forms stray crystal, caused the destruction that whole blade is monocrystalline before the monocrystalline of blade 3 grows to, particularly even more serious to this problem of large-scale blade of gas turbine.
Summary of the invention
For above problem, the invention provides a kind of method eliminating stray crystal defect in single crystal blade.
Technical scheme of the present invention is:
A kind of method eliminating stray crystal defect in single crystal blade, when assembling wax tree, blade wax mould is pasted seeding bar, seeding bar is utilized to be coupled together by the listrium edge of blade bottom end and blade middle and upper part, make single crystal blade investment casting method conveniently, the monocrystalline grown from crystal selector when directional solidification is not only directly to the blade entering blade, also the edge of listrium is entered sideways through seeding bar, converge with the body monocrystalline at blade place again, whole foundry goods is made to grow up to single crystal organization, the edge avoiding listrium was grown up because isolating the cold forming core of stray crystal that causes.
The lower end of seeding bar is drawn from the section surface that seamlessly transits between crystal selector and blade, and upper end is connected to each listrium edge with the danger of generation stray crystal.
The extraction angle of seeding bar lower end is about 15 ° ~ 60 °, is beneficial to wax-pattern assembling and prepares formwork, and avoids producing stray crystal.
Seeding bar upper end will be connected from allowing the face of processing with listrium edge.
Seeding bar can draw several main seeding bars from blade bottom, each main seeding bar can be further divided into some sub-seeding bars and introduce listrium edge to above.The quantity of main seeding bar is generally 1 ~ 5.
The cross sectional shape of each seeding bar is designed to but is not limited to circle, if circular, then its diameter of section is generally 2 ~ 8mm.
Each seeding bar, except two ends, is 2 ~ 20mm with the distance of Blade roughcast body.
Each seeding bar moves towards to try one's best foundry goods body, and length is as far as possible short.
The beneficial effect that the present invention produces:
Method of the present invention, can greatly reduce single crystal blade listrium edge due to the stray crystal defect caused extending transversely, thus significantly improve the monocrystalline yield rate of blade.The present invention is particularly suitable for that size is large, obvious gas turbine single crystal blade given prominence to by listrium.The present invention is simply effective, without the need to adding any new equipment and doing any change to existing equipment, only when assembling wax tree in blade wax mould bonding seeding bar, and carry out cutting and elimination after being cast, remaining all technical process is all constant.
Accompanying drawing explanation
Fig. 1 is that monocrystal blades from having mixed crystal produces position view (arrow refers to place)
Fig. 2 is the layout schematic diagram of seeding bar
Number in the figure represents:
1, blade root, 2, listrium, 3, blade, 4, changeover portion, 5, crystal selector, 6, main seeding bar, 7, sub-seeding bar.
Detailed description of the invention
As shown in Figure 2: the method for stray crystal defect in this elimination single crystal blade, when assembling wax tree, blade wax mould is pasted main seeding bar 6 and sub-seeding bar 7, main seeding bar 6 and sub-seeding bar 7 is utilized the changeover portion 4 of blade bottom and listrium 2 edge of blade middle and upper part to be coupled together (that is: utilizing seeding bar to be coupled together the position that blade bottom and blade middle and upper part and close listrium 2 edge of blade root 1 easily produce stray crystal defect), make single crystal blade investment casting method conveniently, the monocrystalline grown from crystal selector 5 when directional solidification is not only directly to the blade 3 entering blade, also the edge of listrium 2 is entered sideways through seeding bar, converge with the body monocrystalline at blade 3 place again, whole foundry goods is made to grow up to single crystal organization, the edge avoiding listrium was grown up because isolating the cold forming core of stray crystal that causes.
The lower end of main seeding bar 6 is drawn on the surface from the section of seamlessly transitting 4 between crystal selector 5 and blade 3, and upper end is connected to each listrium 2 edge with the danger of generation stray crystal.
Find out extending transversely and sagging corner, listrium 2 place according to blade geometry structure, be defined as the position the most easily producing stray crystal defect.
The blade 3 of blade wax mould is fitted together by changeover portion 4 and crystal selector 5, again by the position determined and the bonding main seeding bar 6 of quantity and sub-seeding bar 7, the lower end of seeding bar 6,7 is from changeover portion 4 extraction, and upper end is connected to each listrium 2 edge with the danger of generation stray crystal.
The extraction angle of seeding bar lower end is about 15 ° ~ 60 °, is beneficial to wax-pattern assembling and prepares formwork, and avoids producing stray crystal.
Seeding bar upper end will be connected from allowing the face of processing with listrium edge.
Seeding bar can draw several main seeding bars 6 from blade bottom, quantity is generally 1-5, and main seeding bar 6 can be further divided into some sub-seeding bars 7 and introduce listrium 2 edge to above.
The cross sectional shape of each seeding bar is designed to but is not limited to circle, if circular, then its diameter of section is generally 2 ~ 8mm.
Each seeding bar, except two ends, is 2 ~ 20mm with the distance of Blade roughcast body.
Each seeding bar moves towards to try one's best foundry goods body, and length is as far as possible short.
Single crystal blade Investment casting technology conveniently, forms wax tree by one or more blade wax mould assembling top bottom-disc and running gate system, carries out sticky oar, drenches sand, dewaxing, roasting, obtained ceramic shell mould; Solidify melted alloy material in stove vacuum oriented and pour into formwork, obtaining single crystal blade through directional solidification.
Embodiment
The experiment preparing the large-scale single crystal blade of combustion engine has been carried out according to above-mentioned invention.Blade itself is about 360mm only, adds that crystal selector 5, changeover portion 4 and running channel height overall are about 500mm.According to blade shape size characteristics, shared two main seeding bars 6, from the changeover portion 4 below blade 3 respectively along the left and right sides seeding of blade to listrium 2 below, be respectively divided into 3 root seeding bars 7, introduce bilevel two corners of listrium 2 and intermediate point.Hollow single crystal blade has been made in success of the test, and blade 3 and listrium 2 place all do not produce stray crystal defect, show feasibility and the validity of this method.
Claims (9)
1. eliminate the method for stray crystal defect in single crystal blade for one kind, it is characterized in that: when assembling wax tree, blade wax mould is pasted seeding bar, seeding bar is utilized to be coupled together by the listrium edge of blade bottom end and blade middle and upper part, make single crystal blade investment casting method conveniently, the monocrystalline grown from crystal selector when directional solidification is not only directly to the blade entering blade, also the edge of listrium is entered sideways through seeding bar, converge with the body monocrystalline at blade place again, whole foundry goods is made to grow up to single crystal organization, the edge avoiding listrium was grown up because isolating the cold forming core of stray crystal that causes.
2. according to the method for stray crystal defect in elimination single crystal blade according to claim 1, it is characterized in that: the lower end of described seeding bar is drawn from the section surface that seamlessly transits between crystal selector and blade, upper end is connected to each listrium edge with the danger of generation stray crystal.
3. according to the method for stray crystal defect in elimination single crystal blade according to claim 1, it is characterized in that: the extraction angle of described seeding bar lower end is 15 ° ~ 60 °, be beneficial to wax-pattern assembling and prepare formwork, and avoid producing stray crystal.
4. according to the wax tree structure of stray crystal defect in elimination single crystal blade according to claim 1, it is characterized in that: described seeding bar upper end will be connected from allowing the face of processing with listrium edge.
5. according to the method for stray crystal defect in elimination single crystal blade according to claim 1, it is characterized in that: described seeding bar draws several main seeding bars from blade bottom, each main seeding bar is further divided into some sub-seeding bars and introduces listrium edge to above.
6. according to the method for stray crystal defect in elimination single crystal blade according to claim 5, it is characterized in that: the quantity of described main seeding bar is 1 ~ 5.
7. according to the method for stray crystal defect in the elimination single crystal blade described in Claims 1 to 5, it is characterized in that, the cross sectional shape of described seeding bar is circular, and its diameter of section is 2 ~ 8mm.
8. according to the method for stray crystal defect in the elimination single crystal blade described in Claims 1 to 5, it is characterized in that, described seeding bar, except two ends, is 2 ~ 20mm with the distance of Blade roughcast body.
9. according to the method for stray crystal defect in the elimination single crystal blade described in Claims 1 to 5, it is characterized in that, described seeding bar moves towards to try one's best foundry goods body, and length is as far as possible short.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510635959.7A CN105108061A (en) | 2015-09-30 | 2015-09-30 | Method of eliminating stray grain defect in single crystal blade |
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| CN201510635959.7A CN105108061A (en) | 2015-09-30 | 2015-09-30 | Method of eliminating stray grain defect in single crystal blade |
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| CN105108061A true CN105108061A (en) | 2015-12-02 |
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| CN201510635959.7A Pending CN105108061A (en) | 2015-09-30 | 2015-09-30 | Method of eliminating stray grain defect in single crystal blade |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107745093A (en) * | 2017-12-06 | 2018-03-02 | 安徽应流航源动力科技有限公司 | A kind of precise casting mold group and using its preparation can essence control crystal orientation nickel-based monocrystal stator casting method |
| CN108097877A (en) * | 2017-11-02 | 2018-06-01 | 江苏大学 | A kind of method for being used to inhibit monocrystal blades from having mixed crystal defects formation |
| CN113564716A (en) * | 2021-06-28 | 2021-10-29 | 深圳市万泽航空科技有限责任公司 | Single crystal high temperature alloy rotor blade and preparation method thereof |
| 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 |
| CN114130994A (en) * | 2021-12-20 | 2022-03-04 | 成都航宇超合金技术有限公司 | Device and method for reducing mixed crystal defects at platform of single crystal blade |
| CN114309470A (en) * | 2021-12-31 | 2022-04-12 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendritic crystal broken arm defects at single crystal blade edge plate through temperature field regulation |
| CN115026243A (en) * | 2022-06-10 | 2022-09-09 | 深圳市万泽航空科技有限责任公司 | Directional blade outcrop crystal control method |
| CN115283650A (en) * | 2022-07-14 | 2022-11-04 | 中国科学院金属研究所 | Method for preventing blade body of single crystal duplex integral casting turbine guide blade from being mixed with crystals |
| CN115889687A (en) * | 2022-11-09 | 2023-04-04 | 中国航发沈阳黎明航空发动机有限责任公司 | Wax mold combination method for single crystal conjoined guide blade air inlet edge seeding |
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| CN1034828C (en) * | 1990-09-14 | 1997-05-07 | 株式会社日立制作所 | Gasturbine, gas turbine blade used therefor and manufacturing method for gas turbine blade |
| DE10033688A1 (en) * | 2000-07-11 | 2002-01-24 | Alstom Power Nv | Producing a rigid cast part used as gas turbine blade comprises connecting the overhang or cross-section extension with a single crystal guide or a transition piece with a single crystal starter or another suitable site of the cast part |
| CN102166643A (en) * | 2011-03-30 | 2011-08-31 | 江苏中欧材料研究院有限公司 | Method for preventing monocrystal blades from having mixed crystal defects |
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1034828C (en) * | 1990-09-14 | 1997-05-07 | 株式会社日立制作所 | Gasturbine, gas turbine blade used therefor and manufacturing method for gas turbine blade |
| DE10033688A1 (en) * | 2000-07-11 | 2002-01-24 | Alstom Power Nv | Producing a rigid cast part used as gas turbine blade comprises connecting the overhang or cross-section extension with a single crystal guide or a transition piece with a single crystal starter or another suitable site of the cast part |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108097877A (en) * | 2017-11-02 | 2018-06-01 | 江苏大学 | A kind of method for being used to inhibit monocrystal blades from having mixed crystal defects formation |
| CN107745093A (en) * | 2017-12-06 | 2018-03-02 | 安徽应流航源动力科技有限公司 | A kind of precise casting mold group and using its preparation can essence control crystal orientation nickel-based monocrystal stator casting method |
| CN113564716B (en) * | 2021-06-28 | 2022-08-02 | 深圳市万泽航空科技有限责任公司 | Single crystal high temperature alloy rotor blade and preparation method thereof |
| CN113564716A (en) * | 2021-06-28 | 2021-10-29 | 深圳市万泽航空科技有限责任公司 | Single crystal high temperature alloy rotor blade and preparation method thereof |
| 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 |
| CN114130994A (en) * | 2021-12-20 | 2022-03-04 | 成都航宇超合金技术有限公司 | Device and method for reducing mixed crystal defects at platform of single crystal blade |
| CN114309470A (en) * | 2021-12-31 | 2022-04-12 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendritic crystal broken arm defects at single crystal blade edge plate through temperature field regulation |
| CN114309470B (en) * | 2021-12-31 | 2023-11-03 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendrite arm defects at edge plate of single crystal blade through temperature field regulation and control |
| CN115026243A (en) * | 2022-06-10 | 2022-09-09 | 深圳市万泽航空科技有限责任公司 | Directional blade outcrop crystal control method |
| CN115026243B (en) * | 2022-06-10 | 2024-04-19 | 深圳市万泽航空科技有限责任公司 | Control method for outcrop crystals of directional blades |
| CN115283650A (en) * | 2022-07-14 | 2022-11-04 | 中国科学院金属研究所 | Method for preventing blade body of single crystal duplex integral casting turbine guide blade from being mixed with crystals |
| CN115283650B (en) * | 2022-07-14 | 2024-03-22 | 中国科学院金属研究所 | Method for preventing blade body of single crystal twin cast turbine guide blade from being mixed |
| CN115889687A (en) * | 2022-11-09 | 2023-04-04 | 中国航发沈阳黎明航空发动机有限责任公司 | Wax mold combination method for single crystal conjoined guide blade air inlet edge seeding |
| CN115889687B (en) * | 2022-11-09 | 2024-05-17 | 中国航发沈阳黎明航空发动机有限责任公司 | Wax mould combination method for single crystal conjuncted guide vane air inlet edge seeding |
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