CN112276008B - Manufacturing method of formwork for double-layer reversible turbine blade - Google Patents
Manufacturing method of formwork for double-layer reversible turbine blade Download PDFInfo
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- CN112276008B CN112276008B CN202011223757.9A CN202011223757A CN112276008B CN 112276008 B CN112276008 B CN 112276008B CN 202011223757 A CN202011223757 A CN 202011223757A CN 112276008 B CN112276008 B CN 112276008B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000009415 formwork Methods 0.000 title claims description 20
- 230000002441 reversible effect Effects 0.000 title claims description 10
- 239000002134 carbon nanofiber Substances 0.000 claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000008096 xylene Substances 0.000 claims abstract description 8
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 6
- 239000004094 surface-active agent Substances 0.000 claims abstract description 6
- 238000007598 dipping method Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 24
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 239000010431 corundum Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000001993 wax Substances 0.000 claims description 7
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000012188 paraffin wax Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 2
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005266 casting Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- 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
Abstract
The invention relates to a method for manufacturing a ceramic mould shell, in particular to a method for manufacturing a mould shell for a double-layer turbine blade capable of reversing. The manufacturing method comprises the steps of wax mould preparation, slurry dipping, sanding, drying, dewaxing and roasting; wherein the slurry in the slurry preparation step is prepared from silica sol, carbon nano-fibers, zircon powder, a surfactant and a defoaming agent, and the carbon nano-fibers have the diameter of 10-50nm and the length of 5-20 mu m; the preparation method of the slurry comprises the following steps: dispersing carbon nano-fiber in xylene, and uniformly mixing the carbon nano-fiber with silica sol, zircon powder, a surfactant and a defoaming agent. The manufacturing method of the invention is scientific, reasonable, simple and easy to implement; the method can reduce the generation of blade cracks and improve the yield of the cast blade.
Description
Technical Field
The invention relates to a method for manufacturing a ceramic mould shell, in particular to a method for manufacturing a mould shell for a double-layer turbine blade capable of reversing.
Background
The ceramic mould shell is widely applied to investment casting and is matched with a ceramic core to prepare a casting with a complex cavity. With the vigorous development of the blue ocean industry in China, the power of the gas turbine for ships is higher and higher, the performance requirement on blades is higher and higher, a large number of large-size blades with cavities, even double-layer blades are applied, and the requirement on ceramic formworks is higher and higher.
At present, the most important part in the research of the structure of the power turbine capable of reversing is the research of the structure of the double-channel one-with-two movable blades of the turbine capable of reversing used for the gas turbine. The structure comprises a turning blade, two reversing blades and a blade crown, wherein the turning blade is connected with the two reversing blades through a blade extending and connecting structure, the blade crown is arranged at the top of the reversing blade, and a tenon root is arranged at the bottom of the turning blade; the reversing blade extension part and the forward blade extension part of the blade extension connecting structure are crossed, and the extension parts are provided with triangular gaps; the blade extending and connecting structure is designed in a hollow way. The structure is specifically described in Chinese patent CN105715305A, and the structure is developed by the seventh good quality research institute of China Ship re-engineering group company and manufactured by Shandong Ruitai New Material science and technology Limited company.
The length of the blade body of the turbine blade capable of backing is 500mm, the blade body is longer, and the problem of uneven thickness exists. In the process of pouring the reversing blades, the large blades are designed in a solid mode, the two reversing blades are designed in a hollow mode, protruding platform portions exist at the joints of the large blades and the small blades, in the cooling process, due to expansion caused by heat and contraction caused by cold, the formwork and the blades are shrunk to a certain degree, however, due to the fact that the coordination number and the density of metal material cells are changed greatly, the formwork is resistant to shrinkage of the protruding portions of the blades, cracks are prone to forming at the joints of the large blades and the small blades, and the success rate of pouring the blades is low.
How to solve the problem and improve the success rate of blade casting is a technical problem to be solved urgently in the field.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for manufacturing the formwork for the double-layer turbine blade capable of backing is scientific, reasonable, simple and easy to implement, the generation of blade cracks is reduced, and the yield of cast blades is improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the manufacturing method of the formwork for the double-layer turbine blade capable of backing comprises the steps of wax mould preparation, slurry dipping, sand spraying, drying, dewaxing and roasting;
the slurry is prepared from the following raw materials in parts by weight:
the surfactant is poly-isopropylene glycol ether or lauryl alcohol ethylene oxide condensate;
the defoaming agent is n-octanol;
the preparation method of the slurry comprises the following steps:
dispersing carbon nano-fiber in xylene, and uniformly mixing the carbon nano-fiber with silica sol, zircon powder, a surfactant and a defoaming agent.
Wherein, the preferred technical scheme is as follows:
the diameter of the carbon nanofiber is 10-50nm, and the length of the carbon nanofiber is 5-20 mu m. The carbon nanofiber is a high-performance fiber, is a new generation of dual-purpose new material for military and civil use, and is widely applied to the fields of aerospace, traffic, sports and leisure articles, medical treatment, machinery, textile and the like.
The wax mould is prepared by the following steps: evenly mixing paraffin and stearic acid, pressing and forming, and inspecting for later use; the mass ratio of the paraffin to the stearic acid is 1: 1.
the sanding adopts corundum particles, wherein the diameter of the corundum particles on the surface layer of the mould shell is 45-65 meshes, and the diameter of the corundum particles on the reinforcing layer is changed from 35-45 meshes to 20-30 meshes.
In the drying process, the temperature of the drying area is 25-30 ℃, and the relative humidity of air is 50-80%.
The dewaxing adopts water bath dewaxing, the water temperature is 95-98 ℃, and the dewaxing time is 15-20 min.
The roasting step specifically comprises the following steps:
the temperature of the roasting furnace is increased from 25 ℃ to 260 ℃ and 280 ℃, and the temperature increasing rate is 2-5 ℃/min;
preserving the heat for 20-30 min;
the temperature is raised to 590-610 ℃, and the temperature raising rate is 5-10 ℃/min;
preserving the heat for 30-35 min;
heating to 890-910 ℃ at a temperature rate of 10-15 ℃/min;
preserving the heat for 120-;
and cooling the furnace to room temperature.
The invention has the following beneficial effects:
1. according to the invention, the carbon nano fiber is added in the manufacturing process of the mold shell, the mold shell added with the carbon nano fiber can form a carbon nano pipeline in the mold shell after high-temperature roasting, the pipeline can improve the air permeability of the mold shell and promote the sintering of the mold shell, and meanwhile, in the longitudinal shrinkage process of the blade, the formation of cracks is facilitated, the longitudinal strength of the mold shell is reduced, the generation of cracks of the blade is reduced, and the yield of the cast blade is improved.
2. The manufacturing method of the formwork for the double-layer reversible turbine blade is scientific, reasonable, simple and feasible, and the manufactured formwork is mainly suitable for hot corrosion resistant turbine blade castings, particularly large-size turbine blades for gas turbines.
Detailed Description
The present invention is further described below with reference to examples.
The raw materials used in the examples were all commercially available materials except for those specifically mentioned.
Example 1
The manufacturing method of the formwork for the double-layer reversible turbine blade comprises the following steps:
(1) wax pattern preparation
Mixing paraffin and stearic acid according to a mass ratio of 1: 1, fully mixing the mould materials, pressing and forming, and inspecting for later use.
(2) Slurry preparation
The slurry is prepared from the following raw materials in parts by weight:
wherein the diameter of the carbon nanofiber is 10-50nm, and the length of the carbon nanofiber is 5-20 μm.
Placing carbon nanofibers in xylene, and after ultrasonic oscillation is carried out for 2 hours, uniformly dispersing the carbon nanofibers in the xylene to obtain a xylene carbon nanofiber solution;
mixing silica sol and zircon powder, adding poly (isopropylene glycol ether), n-octanol and xylene carbon nanofiber solution under the condition of continuous stirring, continuously stirring, and after xylene is volatilized completely, uniformly distributing the carbon nanofibers in the slurry to obtain the slurry for uniformly distributing the carbon nanofibers.
(3) Slurry dipping device
And (3) putting the prepared wax mold into the slurry, and shaking up and down, wherein the slurry dipping time is 25 s.
(4) Sanding and drying
And after taking out the wax mould, spraying corundum particles with the diameter of 23 meshes by using a sand-spraying machine, and then drying, wherein the temperature of a drying area is controlled at 28 ℃, the relative humidity of air is controlled at 70%, and thus the surface layer of the mould shell is obtained.
The process is repeated, and the difference is that the diameters of corundum particles are different, wherein the 2 nd to 5 th layers of the formwork are transition layers, the diameter of the corundum particles is selected to be 28 meshes, the diameter of the corundum particles is selected to be 40 meshes for the 6 th reinforcing layer, the diameter of the corundum particles is selected to be 45 meshes, 48 meshes, 50 meshes and 50 meshes for the 7 th to 10 th layers of the formwork are transition layers, and the diameter of the corundum particles is selected to be 65 meshes for the outermost layer.
(5) Dewaxing
Dewaxing in water bath at 98 deg.C for 20 min.
(6) Roasting
The temperature of the roasting furnace is increased from 25 ℃ to 270 +/-10 ℃, and the temperature rising rate is 4 ℃/min;
preserving the heat for 30 min;
heating to 600 +/-10 ℃, wherein the heating rate is 8 ℃/min;
keeping the temperature for 35 min;
heating to 900 +/-10 ℃, wherein the temperature rate is 12 ℃/min;
keeping the temperature for 125 min;
cooling in a furnace to room temperature to obtain the mold shell.
The mold shell manufactured in the embodiment 1 is adopted to prepare the reversible turbine double-channel one-with-two movable blade structure for the gas turbine by pouring, the success rate is 70%, and the successfully prepared blade has no crack.
Comparative example 1
The manufacturing method of the mould shell for the double-layer turbine blade capable of reversing is the same as that of the embodiment 1, and the difference is that the diameter of the adopted carbon nano fiber is 10-50nm, and the length is 25-100 mu m.
The mold shell manufactured in the comparative example 1 is adopted to prepare the reversing turbine double-channel one-with-two movable blade structure for the gas turbine by pouring, and the success rate is 35 percent.
Comparative example 2
The manufacturing method of the mould shell for the double-layer turbine blade capable of reversing is the same as that of the embodiment 1, and the difference is that the diameter of the adopted carbon nano fiber is 55-100nm, and the length is 5-20 mu m.
The mold shell manufactured in the comparative example 2 is adopted to prepare the reversing turbine double-channel one-with-two movable blade structure for the gas turbine by pouring, and the success rate is 30 percent.
Comparative example 3
The manufacturing method of the mould shell for the double-layer turbine blade capable of reversing is the same as that of the embodiment 1, and the difference is that the diameter of the adopted carbon nano fiber is 55-100nm, and the length is 20-100 mu m.
The mold shell manufactured in the comparative example 3 is adopted to prepare the reversing turbine double-channel one-with-two movable blade structure for the gas turbine by pouring, and the success rate is 10 percent.
Comparative example 4
The manufacturing method of the formwork for the double-layer turbine blade capable of reversing is the same as that in the embodiment 1, except that carbon nano fibers are not adopted in the preparation process of the slurry.
The mold shell manufactured in the comparative example 3 is adopted to prepare the reversing turbine double-channel one-with-two movable blade structure for the gas turbine by pouring, and the success rate reaches 20 percent.
By comparing the embodiment 1 with the comparative examples 1-3, the carbon nanofibers are added into the ceramic mould shell, the formation of cracks at the joint of the large blade and the small blade is obviously reduced, and the success rate of casting the turbine blade capable of backing is effectively improved. Meanwhile, the carbon nanofibers are added into the ceramic mould shell, and certain requirements are provided for the diameter and the length of the carbon nanofibers. The larger the diameter and the length of the carbon nano fiber are, the larger the strength of the mold shell can be reduced by promoting the mold shell to be sintered, and in the process of pouring molten steel, the high-temperature molten steel generates impact force on the mold shell, so that the mold shell can be broken, and the molding of a casting is not facilitated.
The transverse and longitudinal strength of the forms made in example 1 and comparative examples 1-4 were tested according to the national JB/T2980.2-1999 investment casting form high temperature flexural strength test method at 1430 ℃ for 5 times, and the test results are shown in Table 1. Wherein the measured strength refers to the strength of the cross section and the longitudinal section of the formwork.
TABLE 1 test results
As can be seen from example 1 and comparative examples 1 to 2, the carbon nanofiber diameter and length have a large influence on the strength of the mold shell. Properly reducing the strength of the formwork is beneficial to improving the casting success rate, but is too low to be beneficial to the casting success rate.
Claims (5)
1. A manufacturing method of a formwork for a double-layer reversible turbine blade is characterized in that: comprises the steps of wax mould preparation, slurry dipping, sanding, drying, dewaxing and roasting;
the slurry is prepared from the following raw materials in parts by weight:
the diameter of the carbon nanofiber is 10-50nm, and the length of the carbon nanofiber is 5-20 mu m;
the surfactant is poly-isopropylene glycol ether or lauryl alcohol ethylene oxide condensate;
the defoaming agent is n-octanol;
the preparation method of the slurry comprises the following steps:
dispersing carbon nano-fiber in xylene, and uniformly mixing the carbon nano-fiber with silica sol, zircon powder, a surfactant and a defoaming agent.
2. The method for manufacturing a formwork for a double-layer reversible turbine blade of claim 1, wherein: the wax mould is prepared by the following steps: and (3) uniformly mixing the paraffin and the stearic acid, and pressing and forming.
3. The method for manufacturing a formwork for a double-layer reversible turbine blade of claim 1, wherein: the sanding adopts corundum particles, wherein the diameter of the corundum particles on the surface layer of the mould shell is 45-65 meshes, and the diameter of the corundum particles on the reinforcing layer is changed from 35-45 meshes to 20-30 meshes.
4. The method for manufacturing a formwork for a double-layer reversible turbine blade of claim 1, wherein: the dewaxing adopts water bath dewaxing, the water temperature is 95-98 ℃, and the dewaxing time is 15-20 min.
5. The method for manufacturing a formwork for a double-layer reversible turbine blade of claim 1, wherein: the roasting step specifically comprises the following steps:
the temperature of the roasting furnace is increased from 25 ℃ to 260 ℃ and 280 ℃, and the temperature increasing rate is 2-5 ℃/min;
preserving the heat for 20-30 min;
the temperature is raised to 590-610 ℃, and the temperature raising rate is 5-10 ℃/min;
preserving the heat for 30-35 min;
heating to 890-910 ℃ at a temperature rate of 10-15 ℃/min;
preserving the heat for 120-;
and cooling the furnace to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011223757.9A CN112276008B (en) | 2020-11-05 | 2020-11-05 | Manufacturing method of formwork for double-layer reversible turbine blade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011223757.9A CN112276008B (en) | 2020-11-05 | 2020-11-05 | Manufacturing method of formwork for double-layer reversible turbine blade |
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| CN112276008A CN112276008A (en) | 2021-01-29 |
| CN112276008B true CN112276008B (en) | 2022-01-04 |
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| CN113513368B (en) * | 2021-07-08 | 2022-09-02 | 哈尔滨工程大学 | Turbine capable of directly backing with primary and secondary moving blade structures |
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| CN105834361A (en) * | 2016-04-01 | 2016-08-10 | 江苏大学 | Method for preparing modified ceramic mold shell through special-shaped cross section short carbon fibers |
| CN110360331A (en) * | 2019-08-01 | 2019-10-22 | 孙宝秋 | A kind of resistance to erosion valve and its processing technology |
| CN110814287A (en) * | 2019-10-22 | 2020-02-21 | 东风精密铸造安徽有限公司 | Shell manufacturing method for composite precision casting silica sol shell |
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2020
- 2020-11-05 CN CN202011223757.9A patent/CN112276008B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011147984A (en) * | 2010-01-22 | 2011-08-04 | Toyota Central R&D Labs Inc | Mold, solidified body, and method for producing the same |
| CN101885036A (en) * | 2010-06-25 | 2010-11-17 | 武汉市智发科技开发有限公司 | Modified formula for enhancing rapidly-dried silica sol |
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| CN112276008A (en) | 2021-01-29 |
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Denomination of invention: A manufacturing method for a double-layer reversible turbine blade mold shell Granted publication date: 20220104 Pledgee: Commercial Bank of China Yiyuan branch of Limited by Share Ltd. Pledgor: SHANDONG ROITIE NEW MATERIAL SCIENCE AND TECHNOLOGY Co.,Ltd. Registration number: Y2024980007130 |
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