CN107716863B - Casting method for turbine moving blade of gas turbine - Google Patents
Casting method for turbine moving blade of gas turbine Download PDFInfo
- Publication number
- CN107716863B CN107716863B CN201710818487.8A CN201710818487A CN107716863B CN 107716863 B CN107716863 B CN 107716863B CN 201710818487 A CN201710818487 A CN 201710818487A CN 107716863 B CN107716863 B CN 107716863B
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- ceramic shell
- alumina
- turbine
- casting
- shell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a method for casting a turbine moving blade of a combustion engine by using an alumina ceramic shell, which comprises the following steps: 1) preparing a certain number of layers of alumina ceramic shell molds on the wax mold of the moving blade by a slurry dipping and sand spraying method; 2) when the distance between the ceramic shell and the steam seal teeth on the blade top is not adhered and is less than the anti-adhesion distance, the wax sheet is used for wrapping the blade top; 3) continuously using a slurry dipping and sand spraying method on the moving blade wax mold to reach the required shell making layer number, and cleaning slurry and sand on the blade top wax sheet each time; 4) dewaxing the shell and burning residual wax; 5) preparing a mixed solution of silica sol and alumina powder; 6) immersing the top part of the leaf into the mixed solution; 7) drying the leaf top part at room temperature; 8) and heating the shell to 1400-1500 ℃, preserving heat for 0.5-1 h, and then cooling to the temperature required by the process for pouring. The invention can prevent the ceramic shell between the steam seal teeth at the blade top from being adhered, avoid the generation of hot spots and obviously improve the casting quality of the moving blade.
Description
Technical Field
The invention relates to mold precision casting, in particular to a method for manufacturing a ceramic shell for precision casting of a turbine moving blade of a combustion engine.
Background
The steam seal teeth are arranged at the blade top of the moving blade of part of the gas turbine moving blade, when the distance between the adjacent steam seal teeth is small, ceramic shells between the steam seal teeth are adhered in the process of dipping slurry and spraying sand in precision investment casting, so that the thermal shrinkage at the position occurs, and the blade top has the shrinkage defect.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for manufacturing a ceramic shell for precision casting of a turbine moving blade of a combustion engine.
The technical scheme for realizing the invention is as follows: a method for casting moving blades of a combustion engine turbine with an alumina ceramic shell is characterized by comprising the following steps:
1) repeatedly dipping slurry, spraying sand and drying on the moving blade wax mold to prepare a certain number of layers of alumina ceramic shell, wherein the specific number of layers is based on that the ceramic shell among the blade top steam seal teeth is not adhered;
2) when the distance between the ceramic shell and the steam seal teeth at the blade top is smaller than the anti-sticking distance, the wax sheet is used for wrapping the blade top;
3) repeatedly dipping, spraying sand and drying on the moving blade wax mold, and cleaning the slurry and the sand on the blade top wax sheet each time until the required shell-making layer number is reached;
4) dewaxing the shell and burning residual wax;
5) preparing a mixed solution of silica sol and alumina powder;
6) immersing the top part of the leaf into a mixed solution of silica sol and alumina powder;
7) drying the leaf top part at room temperature;
8) before casting, the shell is heated to 1400-1500 ℃, heat preservation is carried out for 0.5-1 h, and then the temperature of the shell is reduced to the temperature required by the process for casting.
In the step 1), the preparation of the alumina ceramic shell with a certain number of layers comprises a preparation surface layer and a preparation back layer;
the surface layer is manufactured, wherein alumina powder in the used surface layer slurry is 320 meshes, and the mass ratio of the alumina to the silica sol is 3: 1, the sand is 100-mesh corundum sand.
The back layer is manufactured, wherein alumina in the used back layer slurry is 200 meshes, and the mass of the alumina and the silica sol is 2: 1, the sand is 46-mesh corundum sand.
The anti-sticking distance is 2 mm.
In the step 5), a mixed solution of silica sol and alumina powder is prepared, wherein the median particle size of the used alumina powder is 4-7 microns, and the mass ratio of the alumina powder to the silica sol is 1: 9.
in the step 6), the time for immersing the top part of the leaf into the mixed solution of the silica sol and the alumina powder is 10-15 minutes.
In the step 7), the time for drying the leaf top part at room temperature is 5 hours.
And 6) repeating the steps 6) and 7) for 1-3 times.
The invention has the beneficial effects that:
the invention can prevent the ceramic shell between the steam seal teeth on the blade top from being adhered, avoid the generation of hot spots and obviously improve the casting quality of the turbine moving blade of the gas turbine.
Detailed Description
A method for casting moving blades of a combustion engine turbine with an alumina ceramic shell mold comprises the following steps:
1) repeatedly dipping slurry, spraying sand and drying on the moving blade wax mold to prepare a certain number of layers of alumina ceramic shell, wherein the specific number of layers is based on that the ceramic shell among the blade top steam seal teeth is not adhered; the preparation of the alumina ceramic shell with a certain number of layers comprises a preparation surface layer and a preparation back layer; when the surface layer is manufactured, the alumina powder in the used surface layer slurry is 320 meshes, and the mass ratio of the alumina to the silica sol is 3: 1, the sand is 100-mesh corundum sand. When the back layer is manufactured, the back layer slurry used is 200 meshes of alumina, and the mass of the alumina and the silica sol is 2: 1, the sand is 46-mesh corundum sand.
2) When the distance between the ceramic shell and the steam seal teeth at the blade top is less than the anti-sticking distance of 2mm, wrapping the blade top part with a wax sheet;
3) repeatedly dipping, spraying sand and drying on the moving blade wax mold, and cleaning the slurry and the sand on the blade top wax sheet each time until the required shell-making layer number is reached;
4) dewaxing the shell and burning residual wax;
5) preparing a mixed solution of silica sol and alumina powder; the median particle size of the used alumina powder is 4-7 microns, and the mass ratio of the alumina powder to the silica sol is 1: 9.
6) and immersing the top part of the leaf into a mixed solution of silica sol and alumina powder for 10-15 minutes.
7) Drying the leaf top part at room temperature for 5 hours; and repeating the step 6) and the step 7) for 1-3 times.
8) Before casting, the shell is heated to 1400-1500 ℃, heat preservation is carried out for 0.5-1 h, and then the temperature of the shell is reduced to the temperature required by the process for casting.
Claims (8)
1. A method for casting moving blades of a combustion engine turbine with an alumina ceramic shell is characterized by comprising the following steps:
1) repeatedly dipping slurry, spraying sand and drying on the moving blade wax mold to prepare a certain number of layers of alumina ceramic shell, wherein the specific number of layers is based on that the ceramic shell among the blade top steam seal teeth is not adhered;
2) when the distance between the ceramic shell and the steam seal teeth at the blade top is smaller than the anti-sticking distance, the wax sheet is used for wrapping the blade top;
3) repeatedly dipping, spraying sand and drying on the moving blade wax mold, and cleaning the slurry and the sand on the blade top wax sheet each time until the required shell-making layer number is reached;
4) dewaxing the shell and burning residual wax;
5) preparing a mixed solution of silica sol and alumina powder; the preparation method comprises the following steps of preparing a mixed solution of silica sol and alumina powder, wherein the median particle size of the used alumina powder is 4-7 microns, and the mass ratio of the alumina powder to the silica sol is 1: 9;
6) immersing the top part of the leaf into a mixed solution of silica sol and alumina powder;
7) drying the leaf top part at room temperature;
8) before casting, the shell is heated to 1400-1500 ℃, heat preservation is carried out for 0.5-1 h, and then the temperature of the shell is reduced to the temperature required by the process for casting.
2. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 1, wherein: in the step 1), the preparation of the alumina ceramic shell with a certain number of layers comprises a preparation surface layer and a preparation back layer.
3. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 2, wherein: the surface layer is prepared by using surface layer slurry, wherein the alumina powder is 320 meshes, and the mass ratio of the alumina powder to the silica sol is 3: 1, the sand is 100-mesh corundum sand.
4. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 2, wherein: the back layer is manufactured, the alumina powder in the back layer slurry is 200 meshes, and the mass of the alumina powder and the silica sol is 2: 1, the sand is 46-mesh corundum sand.
5. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 1, wherein: the anti-sticking distance is 2 mm.
6. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 1, wherein: in the step 6), the time for immersing the top part of the leaf into the mixed solution of the silica sol and the alumina powder is 10-15 minutes.
7. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 1, wherein: in the step 7), the time for drying the leaf top part at room temperature is 5 hours.
8. The method of casting moving blades for a turbine of a combustion engine using an alumina ceramic shell mold according to claim 1, wherein: and 6) repeating the steps 6) and 7) for 1-3 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710818487.8A CN107716863B (en) | 2017-09-12 | 2017-09-12 | Casting method for turbine moving blade of gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710818487.8A CN107716863B (en) | 2017-09-12 | 2017-09-12 | Casting method for turbine moving blade of gas turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107716863A CN107716863A (en) | 2018-02-23 |
| CN107716863B true CN107716863B (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710818487.8A Active CN107716863B (en) | 2017-09-12 | 2017-09-12 | Casting method for turbine moving blade of gas turbine |
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| CN112475820A (en) * | 2020-11-23 | 2021-03-12 | 东方电气集团东方汽轮机有限公司 | Method for machining blade top of movable blade of hollow blade of gas turbine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008213029A (en) * | 2007-03-01 | 2008-09-18 | Taiyo Machinery Co Ltd | Mold removal method in lost foam casting method |
| CN101767187A (en) * | 2008-12-30 | 2010-07-07 | 沈阳黎明航空发动机(集团)有限责任公司 | Positioning process method of complex and hollow high vortex blade ceramic core |
| CN101695741B (en) * | 2009-10-30 | 2011-03-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for positioning mold core and mold shell of hollow blade |
| US8721290B2 (en) * | 2010-12-23 | 2014-05-13 | General Electric Company | Processes for producing components containing ceramic-based and metallic materials |
| CN103071765A (en) * | 2012-12-27 | 2013-05-01 | 清华大学 | Partial air cooling method for precast aperture passage in investment casting shell |
| 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 |
| CN104308076B (en) * | 2014-10-29 | 2016-09-07 | 西安航空动力股份有限公司 | The wax-pattern combination of the hollow turborotor of a kind of tetrad and fine casting method thereof |
| CN105397027A (en) * | 2015-12-02 | 2016-03-16 | 株洲中航动力精密铸造有限公司 | Casting method of casting |
| CN106513585B (en) * | 2016-11-22 | 2018-09-25 | 株洲中航动力精密铸造有限公司 | blade comb tooth forming method |
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