CN104325120A - Method for removing ceramic shell of monocrystalline blade - Google Patents
Method for removing ceramic shell of monocrystalline blade Download PDFInfo
- Publication number
- CN104325120A CN104325120A CN201410591767.6A CN201410591767A CN104325120A CN 104325120 A CN104325120 A CN 104325120A CN 201410591767 A CN201410591767 A CN 201410591767A CN 104325120 A CN104325120 A CN 104325120A
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- CN
- China
- Prior art keywords
- blade
- autoclave
- ceramic shell
- shelling
- single crystal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/04—Handling or stripping castings or ingots
Abstract
The invention provides a method for removing a ceramic shell of a monocrystalline blade and belongs to the technical field of manufacturing of monocrystalline margin-free turbine blades by adopting an investment casting method. The method comprises the following steps: (1) cutting and splitting a shelled monocrystalline blade module into single pieces; (2) gripping a blade body, and knocking a riser head with an aluminum hammer, so as to enable the ceramic shell of an easily-shelled part of the blade body of the blade to fall off or crack; (3) vertically placing the shelled blade into an autoclave, pouring pre-prepared alkali liquor into the autoclave, and energizing to heat up, wherein the heating temperature of the autoclave is 400-600 DEG C, the pressure of the autoclave is 0.5-2MPa, and the shelling time is 6-24 hours; (4) soaking the blade, subjected to shelling, into boiling hot water for 30 minutes to 2 hours, and then, taking out; (5) cleanly cleaning the surface of the blade with a brush, and carrying out neutralizing treatment; (6) carrying out heat treatment on the blade subjected to shelling (depoling), and then, carrying out polishing, sandblasting and the like. The method has the advantages that the acting effect on the blade caused by external forces is lowered, and the re-crystallization reject rate of the blade is greatly lowered.
Description
Technical field
The present invention relates to and adopt investment casting method to manufacture monocrystalline without surplus turbo blade technical field, particularly a kind of single crystal blade ceramic shell minimizing technology.
Background technology
Along with the development of aero-engine, more and more higher to the performance requirement of hot-end component turbo blade, therefore Design Turbine Blade structure becomes increasingly complex, technological requirement is more and more higher, have complicated air cooling structure without surplus single crystal blade, become the main flow of new work engine turbo blade, developed country generally applies in aero-engine and civilian engine, domestic owing to starting late, technical foundation is weak, the technical bottleneck existed is more, and wherein single crystal blade recrystallization problem is exactly the technical barrier being badly in need of solving, and affecting blade prepares qualification rate for a long time.
Single crystal blade recrystallization influence factor is more, and wherein the removal technique of single crystal blade ceramic shell, causes one of principal element of single crystal blade recrystallization exactly.At present, ceramic shell prepared by domestic single crystal blade adopts the aluminium base shell prepared of corundum, and aluminium base shell has good high-temperature stability, and main feature holds that temperature is high, elevated temperature strength good, it is little to be out of shape, chemical stability is good.But the aluminium base shell of preparation at present, after cast blade, residual strength is high, remove difficulty, particularly adopt the physics hulling technologies such as mechanical oscillation, waterpower, blast at present, not only easy damaged blade, and blade can be made to produce larger stress, blade recrystallization can be caused for single crystal blade, cause blade batch to scrap.
Summary of the invention
For the process that the problems referred to above the present invention adopts physics and chemistry to combine, remove single crystal blade ceramic shell, reduce the stress produced in blade de-hulling process, reduce blade recrystallization percent defective.
A kind of single crystal blade ceramic shell of the present invention minimizing technology, carries out according to following steps:
(1) the single crystal blade module cutting of band shell is decomposed into single-piece;
(2) hold blade, adopt aluminium hammer to knock rising head, the ceramic shell at the position that blade blade is easily shelled comes off or ftractures;
(3) band shell blade is vertically put into autoclave, and pour in autoclave by prefabricated alkali lye, power transmission is heated; Autoclave heating-up temperature 400 DEG C ~ 600 DEG C; Pressure 0.5MPa ~ 2MPa; The shelling time: 6h ~ 24h;
(4) complete the blade of shelling, the hot water putting into boiling soaks 30min ~ 2h and takes out;
(5) blade surface is clean with brush cleaning, and carry out neutralisation treatment;
(6) after the blade after (depoling) that shells completes heat treatment, then carry out throwing and repair and the operation such as blast.
Described alkali lye is potassium hydroxide in mass ratio: water=(30 ~ 60): (40 ~ 70);
The present invention produces large stress or stress and concentrates and cause blade recrystallization in single crystal blade de-hulling process, the mode implementing to adopt physics and chemistry to combine removes ceramic shell, reduce external force to the action effect of blade, physical process mainly breaks ceramic shell, corrosion alkali lye is more easily permeated, improves corrosion efficiency.Ceramic shell removes process mainly erosion removal in the alkali lye of high temperature, high pressure.
The portion structures such as the metal-cored support point of single crystal blade, seeding bar, integral shroud, listrium and blade accessory system are complicated, and ceramic shell and blade body are in conjunction with firm, and shell removes difficulty.Adopt new ceramic shell minimizing technology, solve in ceramic shell removal process and cause blade local stress problem, effectively control recrystallization defect, operation is simple and reliable for the method, fringe cost is low, be applied to certain single crystal blade manufacture, the recrystallization percent defective of blade significantly declines, and is successfully applied to the preparation of other single crystal blade.
Accompanying drawing explanation
Fig. 1 is blade construction schematic diagram, 1. rising head 2. blade.
Fig. 2 is for improving front vane recrystallization picture.
Fig. 3 improves rear blade recrystallization picture for adopting the technology of the present invention.
Detailed description of the invention
Embodiment 1
A kind of single crystal blade ceramic shell minimizing technology, carries out according to following steps:
(1) the single crystal blade module cutting of band shell is decomposed into single-piece; As shown in Figure 1,
(2) hold blade 2, adopt aluminium hammer to knock rising head 1, the ceramic shell at the position that blade blade is easily shelled comes off or ftractures.
(3) band shell blade is vertically put into autoclave, and pour in autoclave by prefabricated alkali lye, power transmission is heated; Autoclave heating-up temperature 400 DEG C; Pressure ~ 2MPa; The shelling time: 24h;
(4) complete the blade of shelling, the hot water putting into boiling soaks more than 2h and takes out;
(5) blade surface is clean with brush cleaning, and carry out neutralisation treatment;
(6) after the blade after (depoling) that shells completes heat treatment, then carry out throwing and repair and the operation such as blast.
Described alkali lye is potassium hydroxide in mass ratio: water=30:70;
Improve front vane recrystallization picture as shown in Figure 2, the technology of the present invention is adopted to improve rear blade recrystallization picture as shown in Figure 3, found out by figure and adopt new ceramic shell minimizing technology, solve in ceramic shell removal process and cause blade stress problem, effectively control recrystallization defect.
Embodiment 2
A kind of single crystal blade ceramic shell minimizing technology, carries out according to following steps:
(1) the single crystal blade module cutting of band shell is decomposed into single-piece;
(2) hold blade, adopt aluminium hammer to knock rising head, the ceramic shell at the position that blade blade is easily shelled comes off or ftractures.
(3) band shell blade is vertically put into autoclave, and pour in autoclave by prefabricated alkali lye, power transmission is heated; Autoclave heating-up temperature 500 DEG C; Pressure 1MPa; The shelling time: 15h;
(4) complete the blade of shelling, the hot water putting into boiling soaks 1h and takes out;
(5) blade surface is clean with brush cleaning, and carry out neutralisation treatment;
(6) after the blade after (depoling) that shells completes heat treatment, then carry out throwing and repair and the operation such as blast.
Described alkali lye is potassium hydroxide in mass ratio: water=50:50.
Improve front vane recrystallization picture as shown in Figure 2, the technology of the present invention is adopted to improve rear blade recrystallization picture as shown in Figure 3, found out by figure and adopt new ceramic shell minimizing technology, solve in ceramic shell removal process and cause blade stress problem, effectively control recrystallization defect.
Embodiment 3
A kind of single crystal blade ceramic shell minimizing technology, carries out according to following steps:
(1) the single crystal blade module cutting of band shell is decomposed into single-piece;
(2) hold blade, adopt aluminium hammer to knock rising head, the ceramic shell at the position that blade blade is easily shelled comes off or ftractures.
(3) band shell blade is vertically put into autoclave, and pour in autoclave by prefabricated alkali lye, power transmission is heated; Autoclave heating-up temperature 600 DEG C; Pressure 0.5MPa; The shelling time: 6h;
(4) complete the blade of shelling, the hot water putting into boiling soaks 30min and takes out;
(5) blade surface is clean with brush cleaning, and carry out neutralisation treatment;
(6) after the blade after (depoling) that shells completes heat treatment, then carry out throwing and repair and the operation such as blast.
Described alkali lye is potassium hydroxide in mass ratio: water=60:40.
Improve front vane recrystallization picture as shown in Figure 2, the technology of the present invention is adopted to improve rear blade recrystallization picture as shown in Figure 3, found out by figure and adopt new ceramic shell minimizing technology, solve in ceramic shell removal process and cause blade stress problem, effectively control recrystallization defect.
Claims (2)
1. a single crystal blade ceramic shell minimizing technology, is characterized in that carrying out according to following steps:
(1) the single crystal blade module cutting of band shell is decomposed into single-piece;
(2) hold blade, adopt aluminium hammer to knock rising head, the ceramic shell at the position that blade blade is easily shelled comes off or ftractures;
(3) band shell blade is vertically put into autoclave, and pour in autoclave by prefabricated alkali lye, power transmission is heated; Autoclave heating-up temperature 400 DEG C ~ 600 DEG C; Pressure 0.5MPa ~ 2MPa; The shelling time: 6h ~ 24h;
(4) complete the blade of shelling, the hot water putting into boiling soaks 30min ~ 2h and takes out;
(5) blade surface is clean with brush cleaning, and carry out neutralisation treatment;
(6) after the blade after (depoling) that shells completes heat treatment, then carry out throwing and repair and the operation such as blast.
2. a kind of single crystal blade ceramic shell minimizing technology according to claim 1, is characterized in that described alkali lye is potassium hydroxide in mass ratio: water=(30 ~ 60): (40 ~ 70).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410591767.6A CN104325120A (en) | 2014-10-29 | 2014-10-29 | Method for removing ceramic shell of monocrystalline blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410591767.6A CN104325120A (en) | 2014-10-29 | 2014-10-29 | Method for removing ceramic shell of monocrystalline blade |
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| Publication Number | Publication Date |
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| CN104325120A true CN104325120A (en) | 2015-02-04 |
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| CN201410591767.6A Pending CN104325120A (en) | 2014-10-29 | 2014-10-29 | Method for removing ceramic shell of monocrystalline blade |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107866550A (en) * | 2017-12-21 | 2018-04-03 | 西安欧中材料科技有限公司 | A kind of ceramic core removal methods of aero-engine hollow blade |
| CN110072647A (en) * | 2016-12-13 | 2019-07-30 | 通用电气公司 | For making the integration casting core shell structure of the cast member with thin root part |
| CN111992695A (en) * | 2020-07-13 | 2020-11-27 | 中国科学院金属研究所 | Method for removing ceramic shell of single crystal high-temperature alloy blade |
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-
2014
- 2014-10-29 CN CN201410591767.6A patent/CN104325120A/en active Pending
Patent Citations (6)
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| WO2003086686A1 (en) * | 2002-04-11 | 2003-10-23 | Rolls-Royce Corporation | Method and apparatus for removing ceramic material from cast components |
| CN1931477A (en) * | 2005-09-13 | 2007-03-21 | 联合工艺公司 | Method for casting core removal |
| US20070095501A1 (en) * | 2005-10-27 | 2007-05-03 | United Technologies Corporation | Method for casting core removal |
| CN103252477A (en) * | 2012-02-15 | 2013-08-21 | 中国科学院金属研究所 | Efficient ceramic core removal device for hollow blade |
| CN102974767A (en) * | 2012-12-17 | 2013-03-20 | 中国科学院金属研究所 | Composite efficient ceramic core demolding process and special equipment thereof |
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| 王宝生: ""氧化铝基陶瓷型芯的脱芯设备与工艺"", 《中国优秀硕士学位论文全文数据库（工程科技I辑）》, no. 3, 15 March 2006 (2006-03-15) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110072647A (en) * | 2016-12-13 | 2019-07-30 | 通用电气公司 | For making the integration casting core shell structure of the cast member with thin root part |
| CN107866550A (en) * | 2017-12-21 | 2018-04-03 | 西安欧中材料科技有限公司 | A kind of ceramic core removal methods of aero-engine hollow blade |
| CN111992695A (en) * | 2020-07-13 | 2020-11-27 | 中国科学院金属研究所 | Method for removing ceramic shell of single crystal high-temperature alloy blade |
| CN111992695B (en) * | 2020-07-13 | 2022-05-31 | 中国科学院金属研究所 | Method for removing ceramic shell of single crystal high-temperature alloy blade |
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Application publication date: 20150204 |