CN104923734A - Vertical ceramic mould housing for single crystal blade forming and forming method of ceramic mould housing - Google Patents
Vertical ceramic mould housing for single crystal blade forming and forming method of ceramic mould housing Download PDFInfo
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- CN104923734A CN104923734A CN201510251777.XA CN201510251777A CN104923734A CN 104923734 A CN104923734 A CN 104923734A CN 201510251777 A CN201510251777 A CN 201510251777A CN 104923734 A CN104923734 A CN 104923734A
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- wax
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- ceramic shell
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Abstract
The invention discloses a vertical ceramic mould housing for single crystal blade forming and a forming method of the ceramic mould housing. The ceramic mould housing is characterized in that the ceramic mould housing is erected above a chassis; a crystal selector and a plurality of supporting columns are arranged between the chassis and the ceramic mould housing; the supporting columns are arranged at the periphery of the crystal selector in a surrounding manner; and the supporting columns and the ceramic mould housing are molded integrally. The forming method of the ceramic mould housing comprises the steps that 1) a blade wax mould, a chassis wax mould and a crystal selection wax mould are manufactured; 2) the blade wax mould is assembled on the crystal selection wax mould, the crystal selection wax mould is assembled on the chassis wax mould, a plurality of supporting rods are arranged between the chassis wax mould and the blade wax mould, and arranged at the periphery of the crystal selection wax mould in a surrounding manner; and 3) and the ceramic mould housing is manufactured in a slurry dipping and sand leaching manner. According to the vertical ceramic mould housing and the forming method, reliable and stable supporting for the vertical ceramic mould housing is formed on the chassis, and the whole supporting structure is simple and compact, so that obstruction to heat transfer by radiation is avoided effectively, and the vertical ceramic mould housing does not affect crystal growth conditions of an alloy melt in unidirectional solidification.
Description
Technical field
The present invention relates to the formwork forming technique of accurate founding, specifically a kind of single crystal blade is shaping uses vertical ceramic shell mould, and the forming method of this ceramic shell mould.
Background technology
Single crystal blade obtains the generally favor of industrial equipment because it has excellent structural behaviour, such as, improve the high-temperature behavior etc. of aero-engine, industry gas turbine with single crystal turbine blade.
Blade is the thin and long units of profile abnormity, and it is in the hot investment casting of monocrystalline founding, needs ceramic shell mould shaping for single crystal blade to carry out setting and arranges, this shaping more obvious especially with large-scale single crystal blade; Erectting in the ceramic shell mould arranged, effectively can realize the monocrystalline order growth of alloy molten solution in ceramic shell mould, and reduce, even avoid stray crystal to produce.
Based on above-mentioned moulding process requirement, elongated ceramic shell mould is erected at above chassis by crystal selector, and crystal selector is the helical structure that diameter is tiny, it is difficult to structural volume, weight to carry out secure support much larger than itself ceramic shell mould, moreover ceramic shell mould also needs splendid attire alloy molten solution, these weight all can be applied directly on crystal selector.Thus, need the ceramic shell mould above to chassis that bracing frame is set separately and carry out " support ", with to relatively fragile crystal selector " unloading ".
Shown in Figure 1, single crystal blade common is at present shaping as follows by vertical ceramic shell mould structure: ceramic shell mould 3 has the blade die cavity 31 of matched design blade shape; Ceramic shell mould 3 is arranged on above chassis 1 in setting mode by crystal selector 2, and the area on this chassis 1 is greater than the area at the radial largest contours place of ceramic shell mould 3; The chassis 1 of ceramic shell mould 3 orthographic projection periphery is provided with many root posts 42(normally four; Drench the mode of sand by metal-cored wax-pattern with mucilage shaping, in figure, 43 are formed cavity for metal-cored wax-pattern), the height of these columns 42 substantially and the top of ceramic shell mould 3 fair; Integrated crossbeam 41 is provided with between the top of ceramic shell mould 3 and each column 42; Ceramic shell mould 3 is formed at the One On The Chassis bracing frame 4 by crossbeam 41 and column 42 with this.
Though above-mentioned ceramic shell mould structure can make it form reliable, stable supporting construction, chassis and bracing frame form thick ceramic support frame in the periphery of ceramic shell mould, and it has following technical deficiency: 1. structure is too fat to move and complicated, and forming process is time-consuming and take material; 2. thick bracing frame have impact on the radiant heat transfer in directional solidification process in the periphery of whole ceramic shell mould, thus easily makes the crystal growth condition of the alloy molten solution in ceramic shell mould be deteriorated, and affect the end product quality of single crystal blade, qualification rate is low.
Summary of the invention
Goal of the invention of the present invention is: for particularity and the above-mentioned the deficiencies in the prior art of directional solidification processes, a kind of simple and compact structure is provided, reliable and stable support can be formed on ceramic shell mould on chassis, does not affect the shaping ceramic shell mould of single crystal blade of crystal growth condition in directional solidification and the forming method of this ceramic shell mould.
The technical solution adopted in the present invention is: a kind of single crystal blade is shaping uses vertical ceramic shell mould, described ceramic shell mould is erected at above chassis, crystal selector is provided with between this chassis and ceramic shell mould, many support columns are also provided with between described chassis and ceramic shell mould, these support columns around being arranged in crystal selector periphery, and these support columns and ceramic shell mould one-body molded.
Described support column is shaping in the centroclinal mode in upper end.
The shaping forming method with vertical ceramic shell mould of above-mentioned single crystal blade, comprises the following steps:
1). the blade shape according to design makes blade wax mould, and makes the chassis wax-pattern of support blade wax mould and select brilliant wax-pattern;
2). blade wax mould being combined in and selecting on brilliant wax-pattern, being combined on the wax-pattern of chassis by selecting brilliant wax-pattern; Between chassis wax-pattern and blade wax mould, arrange many support sticks, these support sticks select the periphery of brilliant wax-pattern around being arranged in, form wax tree with this;
3). in step 2) mode that the wax tree that formed drenches sand with mucilage makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork, the support column between shaping ceramic shell mould and chassis is formed in one structure.
Preferably, the diameter of section of described support stick is 2 ~ 20mm.
Described support stick is ceramic rod and/or rod wax; The support stick of described ceramic rod combines with spaced apart, direct abutting or the mode of insertion and the bottom of blade wax mould; The support stick of described rod wax combines with the bottom of blade wax mould in a spaced apart manner; The distance of described gaps is 2 ~ 10mm.
The invention has the beneficial effects as follows: the present invention by arranging many support columns between the bottom of erectting ceramic shell mould and chassis, reliable, stable support is formed on chassis to the ceramic shell mould erect, this supporting construction can bear impulsive force and the static pressure of alloy melt cast, effectively prevent the fracture of formwork and spilling of melt, and then ensure that single crystal blade carrying out smoothly in shell processed, cast and process of setting; Whole supporting construction is simple and compact, and forming process is convenient, save time material-saving; In addition, the support column of this supporting construction is thin and short, is in again the bottom of ceramic shell mould, thus effectively prevent the obstruction to formwork middle and upper part radiant heat transfer, and make it not affect the crystal growth condition of directional solidification blade portions, reliability is high, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is the shaping structural representation with vertical ceramic shell mould of existing single crystal blade.
Fig. 2 is a kind of structural representation of ceramic shell mould of the present invention.
Fig. 3 is the wax tree structural representation before the forming of ceramic shell mould shown in Fig. 2.
Fig. 4 is the schematic diagram after wax tree shown in Fig. 3 carries out mucilage pouring sand.
Code name implication in figure: 1-chassis; 2-crystal selector; 3-ceramic shell mould; 31-blade die cavity; 4-bracing frame; 41-crossbeam; 42-column; 43-cavity that metal-cored wax-pattern is formed; 5-support column; 51-support stick (51a-ceramic rod; 51b-rod wax); 6-blade wax mould; 7-select brilliant wax-pattern; 8-chassis wax-pattern.
Detailed description of the invention
See Fig. 2: a kind of single crystal blade is shaping uses vertical ceramic shell mould, and wherein said blade is mainly the large-scale blade of heavy combustion engine.Described ceramic shell mould 3 has the blade die cavity 31 of corresponding design blade shape, and this ceramic shell mould 3 is erected at the top on chassis 1, is provided with crystal selector 2 between this chassis 1 and bottom of ceramic shell mould 3, and they are all integrated.Also be provided with many support column 5(between aforementioned chassis 1 and the bottom of ceramic shell mould 3 and be generally three to the six roots of sensation, such as four; It can be solid support post, also can be hollow support post, can also be the solid and hollow mixed support column taken), these support columns 5 are comparatively uniform peripheral around being arranged in crystal selector 2, the mode that every root support column 5 tilts with upper end centripetal (referring to the axle center that ceramic shell mould 3 is erect) is shaping, every root support column 5 is generally 40 ~ 90 ° at the One On The Chassis angle of inclination, such as 50 ° etc., and these support columns 5 are formed in one with ceramic shell mould 3, chassis 1, crystal selector 2.
The thickness on above-mentioned chassis 1 is generally 5 ~ 10mm.
See Fig. 3 and Fig. 4: the shaping forming method with vertical ceramic shell mould of above-mentioned single crystal blade, mainly comprises the following steps:
1). the blade shape according to design makes blade wax mould 6, and makes the chassis wax-pattern 8 of support blade wax mould 6 and select brilliant wax-pattern 7; Prepare many support sticks 51, it is certain that these support sticks 51 choose ceramic rod 51a and rod wax 51b(respectively, and these support sticks 51 can all choose ceramic rod 51a simultaneously, or, all choose rod wax 51b); The diameter of section of every root support stick 51 is 2 ~ 20mm, such as 5mm, 10mm or 15mm etc., and the choosing of this value provides enough support strengths and the radiant heat transfer do not affected in directional solidification processes to be advisable.
2). blade wax mould 6 is erect to be combined in and selects on brilliant wax-pattern 7, the bottom minimum point of blade wax mould 6 is connected with selecting the top of brilliant wax-pattern 7; Be combined on chassis wax-pattern 8 by selecting brilliant wax-pattern 7, many ceramic rod 51a and rod wax 51b are arranged between chassis wax-pattern 8 and blade wax mould 6 around selecting brilliant wax-pattern 7 in an inclined manner, (also can be directly abut or isolated mode) and the bottom of blade wax mould 6 be combined in the way to insert in the upper end of every root ceramic rod 51a, and the upper end of every root rod wax 51b is combined with the bottom of the mode of gaps and blade wax mould 6, the distance that aforementioned gap separates is 2 ~ 10mm, such as 2mm or 5mm etc., specifically depending on ceramic layer thickness; Wax tree is formed with this;
3). in step 2) mode that the wax tree that formed drenches sand with mucilage repeatedly makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork 3, solid support post 5(between shaping ceramic shell mould 3 and chassis 1 with ceramic rod 51a for support stick 51) and hollow support post 5(with rod wax 51b for support stick 51) be formed in one structure, namely support column 5, chassis 1, ceramic shell mould 3 and crystal selector 2 are formed in one structure.
Above technical scheme only in order to the present invention to be described, is not intended to limit.Although with reference to above-mentioned concrete technical scheme to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to above-mentioned concrete technical scheme, or equivalent replacement is carried out to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of technical solution of the present invention.
Claims (5)
1. a single crystal blade is shaping uses vertical ceramic shell mould, described ceramic shell mould (3) is erected at top, chassis (1), crystal selector (2) is provided with between this chassis (1) and ceramic shell mould (3), it is characterized in that: between described chassis (1) and ceramic shell mould (3), be also provided with many support columns (5), these support columns (5) are peripheral around being arranged in crystal selector (2), and these support columns (5) are one-body molded with ceramic shell mould (3).
2. single crystal blade is shaping according to claim 1 uses vertical ceramic shell mould, it is characterized in that: described support column (5) is shaping in the centroclinal mode in upper end.
3. the shaping forming method with vertical ceramic shell mould of single crystal blade described in claim 1 or 2, comprises the following steps:
1). the blade shape according to design makes blade wax mould (6), and makes the chassis wax-pattern (8) of support blade wax mould (6) and select brilliant wax-pattern (7);
2). blade wax mould (6) is combined in and selects on brilliant wax-pattern (7), brilliant wax-pattern (7) will be selected to be combined on chassis wax-pattern (8); Between chassis wax-pattern (8) and blade wax mould (6), arrange many support sticks (51), these support sticks (51), around being arranged in the periphery selecting brilliant wax-pattern (7), form wax tree with this;
3). in step 2) mode that the wax tree that formed drenches sand with mucilage makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork (3), the support column (5) between shaping ceramic shell mould (3) and chassis (1) is formed in one structure.
4. the shaping forming method with vertical ceramic shell mould of single crystal blade according to claim 3, is characterized in that: the diameter of section of described support stick (51) is 2 ~ 20mm.
5. the shaping forming method with vertical ceramic shell mould of single crystal blade according to claim 3, is characterized in that: described support stick (51) is ceramic rod (51a) and/or rod wax (51b); Described ceramic rod (51a) combines with spaced apart, direct abutting or the mode of insertion and the bottom of blade wax mould (6); Described rod wax (51b) combines with the bottom of blade wax mould (6) in a spaced apart manner; The distance of described gaps is 2 ~ 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510251777.XA CN104923734A (en) | 2015-05-18 | 2015-05-18 | Vertical ceramic mould housing for single crystal blade forming and forming method of ceramic mould housing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510251777.XA CN104923734A (en) | 2015-05-18 | 2015-05-18 | Vertical ceramic mould housing for single crystal blade forming and forming method of ceramic mould housing |
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| CN104923734A true CN104923734A (en) | 2015-09-23 |
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| CN201510251777.XA Pending CN104923734A (en) | 2015-05-18 | 2015-05-18 | Vertical ceramic mould housing for single crystal blade forming and forming method of ceramic mould housing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105081220A (en) * | 2015-09-25 | 2015-11-25 | 东方电气集团东方汽轮机有限公司 | Multi-cavity ceramic die shell and forming method of ceramic die shell |
| CN105290324A (en) * | 2015-10-16 | 2016-02-03 | 沈阳工业大学 | Anti-deformation preparation process of large-size turbine guide vane |
| CN105312503A (en) * | 2015-11-13 | 2016-02-10 | 沈阳黎明航空发动机(集团)有限责任公司 | Auxiliary device for combination of single crystal blade modules and application method of auxiliary device |
| CN106734886A (en) * | 2017-01-23 | 2017-05-31 | 江苏永瀚特种合金技术有限公司 | A kind of method for preventing the formwork cracking during shell processed |
| CN109773137A (en) * | 2019-01-17 | 2019-05-21 | 中国科学院金属研究所 | A method of preventing the formation of single crystal super alloy guide vane stray crystal defect |
| CN110405146A (en) * | 2019-08-30 | 2019-11-05 | 中国航发动力股份有限公司 | A kind of device and method for reinforcing crystal selector formwork |
| CN115069978A (en) * | 2021-03-16 | 2022-09-20 | 中国航发商用航空发动机有限责任公司 | Casting system and casting method for splash plate of combustion chamber |
| EP4180147A1 (en) * | 2021-11-12 | 2023-05-17 | General Electric Company | Method and apparatus for supporting wax pattern during investment casting |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105081220A (en) * | 2015-09-25 | 2015-11-25 | 东方电气集团东方汽轮机有限公司 | Multi-cavity ceramic die shell and forming method of ceramic die shell |
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| CN105290324A (en) * | 2015-10-16 | 2016-02-03 | 沈阳工业大学 | Anti-deformation preparation process of large-size turbine guide vane |
| CN105290324B (en) * | 2015-10-16 | 2017-12-15 | 沈阳工业大学 | Large scale turborotor anti-deformation preparation technology |
| CN105312503A (en) * | 2015-11-13 | 2016-02-10 | 沈阳黎明航空发动机(集团)有限责任公司 | Auxiliary device for combination of single crystal blade modules and application method of auxiliary device |
| CN106734886A (en) * | 2017-01-23 | 2017-05-31 | 江苏永瀚特种合金技术有限公司 | A kind of method for preventing the formwork cracking during shell processed |
| CN109773137A (en) * | 2019-01-17 | 2019-05-21 | 中国科学院金属研究所 | A method of preventing the formation of single crystal super alloy guide vane stray crystal defect |
| CN109773137B (en) * | 2019-01-17 | 2020-07-10 | 中国科学院金属研究所 | Method for preventing formation of mixed crystal defects of single crystal high temperature alloy guide blade |
| CN110405146A (en) * | 2019-08-30 | 2019-11-05 | 中国航发动力股份有限公司 | A kind of device and method for reinforcing crystal selector formwork |
| CN110405146B (en) * | 2019-08-30 | 2021-02-05 | 中国航发动力股份有限公司 | Device and method for reinforcing die shell of crystal selector |
| CN115069978A (en) * | 2021-03-16 | 2022-09-20 | 中国航发商用航空发动机有限责任公司 | Casting system and casting method for splash plate of combustion chamber |
| EP4180147A1 (en) * | 2021-11-12 | 2023-05-17 | General Electric Company | Method and apparatus for supporting wax pattern during investment casting |
| US11738386B2 (en) | 2021-11-12 | 2023-08-29 | General Electric Company | Apparatus for supporting wax pattern during investment casting |
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Application publication date: 20150923 |
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