CN107812883B - A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center - Google Patents

A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center Download PDF

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Publication number
CN107812883B
CN107812883B CN201711005040.5A CN201711005040A CN107812883B CN 107812883 B CN107812883 B CN 107812883B CN 201711005040 A CN201711005040 A CN 201711005040A CN 107812883 B CN107812883 B CN 107812883B
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China
Prior art keywords
blade
conjuncted
ceramic shell
ceramic
mould
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CN201711005040.5A
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CN107812883A (en
Inventor
王海伟
杨啊涛
张琼元
杨功显
巩秀芳
张建平
魏先平
张松泉
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DEC Dongfang Turbine Co Ltd
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DEC Dongfang Turbine Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C7/00Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02Lost patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/04Use of lost patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings
    • B22C9/24Moulds for peculiarly-shaped castings for hollow articles

Abstract

The invention discloses a kind of ceramic shell preparation methods for eliminating conjuncted blade blade thermal center, comprising the following steps: S1: the production of conjuncted blade wax mould mould group;S2: the production of conjuncted blade mould group ceramic shell: S21: conjuncted blade wax mould mould group is cleaned;S22: making ceramic shell using leaching mode is stained with, blade mould group conjuncted after cleaning be stained in ceramic slurry and is wrapped up in, and will be stained with the conjuncted blade mould group for having wrapped up in ceramic slurry and carries out sand bed covering in drenching husky machine, is then dried, forms one layer of ceramic shell;S23: repeated several times S22, the i.e. repeatedly production operation of several layers ceramic shell;S24: during step S23, disappearance layer is set in the gap between the ceramic shell of blade mould group, to guarantee the ceramic shell intensity at the blade back and leaf basin of blade, and the generation of thermal center between conjuncted blade can be eliminated;S25: ceramic slurry slurry seal is carried out on the basis of S24 finished product, forms final ceramic shell.

Description

A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center
Technical field
The present invention relates to ceramic shell preparation fields, more particularly to a kind of ceramic mould for eliminating conjuncted blade blade thermal center Shell preparation method.
Background technique
The method that aero engine turbine blades and gas turbine blades all use hot investment casting manufactures.Currently, accurate casting It makes and is primarily referred to as losing wax hot investment casting, main flow includes: compacting blade and running gate system wax-pattern, is required according to technique by leaf Piece and running gate system form wax tree;Ceramic shell preparation section is carried out after completing wax-pattern assembling, the preparation of ceramic shell is mainly adopted It is carried out with the husky mode of slurry leaching is stained with, i.e., carries out leaching sand after one layer of ceramic slurry uniformly being wrapped up on wax tree surface, make complete outside pulp layer The sand of one layer of refractory material of full uniform fold, after dry a period of time, slurry and refractory material sand constitute ceramic shell One layer, by be stained with above slurry leaching it is husky in the way of, repeatedly, after ceramic shell reaches certain number of plies, ceramic shell is most Outer one layer is only stained with slurry, completes ceramic shell preparation;After ceramic shell is sufficiently dry, using dewaxing kettle, at high temperature under high pressure will Wax-pattern removal, then burns up residual wax, strengthens ceramic shell;Alloy smelting is finally melted, molten steel is poured into preheated formwork, it is complete At casting, removing surface shell can be obtained Blade roughcast blank.But it often will appear some castings in blade preparation process to lack It falls into, such as loose, causes blade rejection, influence production efficiency.
Loose is a kind of high-temperature alloy blades casting flaw common during essence casting, and feeding deficiency is when alloy graining Casting generates the main reason for loose.For guide vane, in order to improve the production efficiency, generally using conjuncted casting, but by There are gaps between conjuncted blade, be easy to cause sand to accumulate when being stained with slurry leaching sand and preparing formwork, prepare ceramic shell to one It is easy to make formwork between conjuncted blade to connect together after given layer number, ultimately forms the thermal center 8 in thermal center such as Fig. 4, be easy to make blade Blade generates rarefaction defect.
Summary of the invention
It is an object of the invention to overcome the above-mentioned problems in the prior art, a kind of conjuncted blade blade of elimination is proposed The ceramic shell preparation method of thermal center the characteristics of using disappearance layer by heat abstraction, controls the thickness of ceramic shell, prepares ceramic mould Not only it can guarantee the intensity of formwork at the leaf basin of conjuncted blade when shell, but also the thermal center between conjuncted blade can be eliminated.
The purpose of the present invention is realized by following technical proposals:
A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center, comprising the following steps:
S1: the production of conjuncted blade wax mould mould group:
Conjuncted blade wax mould mould group is made by welding running gate system and conjuncted blade wax mould, the conjuncted blade includes: Several blades, curtain plate and inner platform;
S2: the production of ceramic shell:
S21: conjuncted blade wax mould mould group is cleaned;
S22: ceramic shell is made using leaching mode is stained with, blade wax mould mould group conjuncted after cleaning is stained in ceramic slurry It wraps up in, the conjuncted blade for having wrapped up in ceramic slurry will be stained with and carry out sand bed covering in drenching husky machine, be then dried, form one layer of ceramics Shell;
S23: repeated several times S22, the i.e. repeatedly production operation of several layers ceramic shell;
S24: during step S23, disappearance layer is set, to guarantee leaf in the gap between the ceramic shell of blade The blade back of piece and the ceramic shell intensity at leaf basin, and the generation of thermal center between conjuncted blade blade can be eliminated;
S25: ceramic slurry slurry seal package is carried out on the basis of S24 finished product, forms final ceramic shell.
A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the invention, when the setting of the disappearance layer Machine is the number of plies of ceramic shell intermediate when being 3-7 layers.
A kind of the characteristics of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the invention, the disappearance layer be Heated section eliminates, and material is preferably wax disk(-sc), sponge or plank.
A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the invention, the shape of the disappearance layer with The blade back shape of blade is profile-followed.
A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the invention, the area of the disappearance layer is not More than the area of blade back.
A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the invention, the disappearance layer and adjacent pottery The gap of porcelain shell is interference fit.
A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the invention, the disappearance layer are equipped with and take Portion out, the taking-up portion should stretch out ceramic shell, in order to which the disappearance layer completely eliminates.
According to the above technical scheme, the beneficial effects of the present invention are: proposing a kind of pottery for eliminating conjuncted blade blade thermal center Porcelain shell preparation method achievees the effect that eliminate rarefaction defect, greatly improve by reducing the formwork thickness between conjuncted blade The qualification rate of blade cast blank.Compared with current process, the invention operating procedure is simple, and cost is relatively low, high production efficiency, no Need to change the techniques such as pouring temperature, formwork preheating temperature and running gate system, i.e., with can directly eliminate conjuncted blade blade Thermal center successfully solves the ceramic shell number of plies and excessively easily causes hot tearing, rarefaction defect and layer to eliminate blade rarefaction defect Number it is very few be also easy to produce bleed-out, the contradiction between the shell problem that rises, can not only guarantee the intensity of blade blade shell, but also can eliminate conjuncted Thermal center between blade, and it is applicable not only to solid conjuncted blade, while being also applied for hollow conjuncted blade.
Detailed description of the invention
Fig. 1 is conjuncted blade signal in a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the present invention Figure;
Fig. 2 is that conjuncted blade is faced in a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the present invention Figure;
Fig. 3 is C-C sectional view in Fig. 2;
Fig. 4 is the defect map of original method;
Fig. 5 is a kind of procedure chart for the ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the present invention.
Specific embodiment
The present invention is further illustrated with attached drawing combined with specific embodiments below.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention
If Fig. 1-5 is a kind of embodiment for the ceramic shell preparation method for eliminating conjuncted blade blade thermal center of the present invention, one Kind eliminates the ceramic shell preparation method of conjuncted blade blade thermal center, comprising the following steps:
S1: the production of conjuncted blade wax mould mould group:
Conjuncted blade wax mould mould group is made by welding running gate system 1 and conjuncted 3 wax-pattern of blade, the conjuncted blade 3 wraps It includes: several blades, curtain plate 2 and inner platform 4;
S2: the production of ceramic shell:
S21: conjuncted blade wax mould mould group is cleaned;
S22: ceramic shell is made using leaching mode is stained with, blade wax mould mould group conjuncted after cleaning is stained in ceramic slurry It wraps up in, the conjuncted blade for having wrapped up in ceramic slurry will be stained with and carry out sand bed covering in drenching husky machine, be then dried, form one layer of ceramics Shell 7;
S23: repeated several times S22, the i.e. repeatedly production operation of several layers ceramic shell 7;
S24: during step S23, disappearance layer 9 is set, to guarantee in the gap between the ceramic shell 7 of blade The blade back 6 of blade and the ceramic shell intensity at leaf basin 5, and the generation of thermal center 8 can be eliminated;
S25: ceramic slurry slurry seal package is carried out on the basis of S24 finished product, forms final ceramic shell 7.
The setting opportunity of the disappearance layer 9 is the number of plies of ceramic shell intermediate when being 3-7 layers.
The material of the disappearance layer 9 is preferably wax disk(-sc), sponge or plank.
The shape of the disappearance layer 9 and 6 shape of blade back of blade are profile-followed.
The area of the disappearance layer 9 is no more than the area of blade back 6.
The gap of the disappearance layer 9 and adjacent ceramic shell is interference fit.
The disappearance layer 9 is equipped with taking-up portion, and the taking-up portion should stretch out ceramic shell 7, in order to which the disappearance layer 9 is complete It totally disappeared and remove.
Brief process:
It is initially formed conjuncted blade, then will prepare ceramic shell in the way of being stained with slurry leaching sand after conjuncted leaf cleaning, After one layer of ceramic slurry is uniformly wrapped up on its surface, it is put into leaching Sha Jizhong, makes one layer of fire resisting sand of ceramic slurry surface uniform fold Son, sufficiently after drying, the sand of ceramic slurry and covering thereon just constitutes the ceramic shell in ceramic shell.It is drenched according to slurry is stained with Repeatedly, when the ceramic shell number of plies of conjuncted blade is 3 ~ 7 layers, there is seam between conjuncted blade formwork at this time in husky mode Gap, by 9 fixed placement of disappearance layer between the gap of ceramic shell, certain thickness wax disk(-sc), certain thickness is can be used in disappearance layer Sponge or the plank profile-followed with blade shell, the thickness and area of eliminating layer can design according to actual needs, thickness range can 0.1 ~ 100mm is taken, length and width can be profile-followed with the blade back of blade according to maximum.Then proceed to the system by the way of being stained with slurry leaching sand Standby ceramic shell guarantees that eliminating layer 9 should be fixed during shell processed, quick sand, ceramic mould is removed after each layer of ceramic shell system Shell reaches slurry seal after certain number of plies, completes shell processed, as shown in Figure 5.
Then the ceramic shell prepared is put into dewaxing kettle and is dewaxed, burn residual wax.In the process, disappearance layer 9 removes, Obtain the ceramic shell that local thickness is controlled.
Pouring molten steel to the ceramic shell prepared after solidification forming, is removed cast(ing) surface type by then molten alloy The spray of conjuncted blade can be obtained in shell.
The ceramic shell that such local thickness is controlled ensure that the formwork thickness at the leaf basin of blade, pouring molten steel Afterwards, bleed-out, bulging problem will not be caused since form strength is too low in solidification, ensure that blade dimensions precision;And it eliminates Thermal center between conjuncted blade, eliminates conjuncted blade blade rarefaction defect.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (6)

1. a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center, which comprises the following steps:
S1: the production of conjuncted blade wax mould mould group:
Conjuncted blade wax mould mould group is made by welding running gate system and conjuncted blade wax mould, the conjuncted blade includes: several Blade, curtain plate and inner platform;
S2: the production of ceramic shell:
S21: conjuncted blade wax mould mould group is cleaned;
S22: making ceramic shell using leaching mode is stained with, blade wax mould mould group conjuncted after cleaning be stained with using ceramic slurry and is wrapped up in, will It is stained with the conjuncted blade for having wrapped up in ceramic slurry progress sand bed covering in drenching husky machine, is then dried, forms one layer of ceramic shell;
S23: repeated several times S22, the i.e. repeatedly production operation of several layers ceramic shell;
S24: during step S23, disappearance layer (9) are set in the gap between the ceramic shell of blade, to guarantee leaf The blade back of piece and the ceramic shell intensity at leaf basin, and the generation of thermal center between conjuncted blade blade can be eliminated;
S25: ceramic slurry slurry seal package is carried out on the basis of S24 finished product, forms final ceramic shell.
2. a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center according to claim 1, feature exist In: the setting opportunity of the disappearance layer is the number of plies of ceramic shell be 3-7 layers when.
3. a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center according to claim 2, feature exist In: the shape of the disappearance layer and the blade back shape of blade are profile-followed.
4. a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center according to claim 3, feature exist In: the area of the disappearance layer is no more than the area of blade back.
5. a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center according to claim 4, feature exist In: the gap of the disappearance layer and adjacent ceramic shell is interference fit.
6. a kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center according to claim 5, feature exist In: the disappearance layer is equipped with taking-up portion, and the taking-up portion should stretch out ceramic shell, in order to which the disappearance layer completely eliminates.
CN201711005040.5A 2017-10-25 2017-10-25 A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center Active CN107812883B (en)

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CN109290519A (en) * 2018-11-22 2019-02-01 江苏永瀚特种合金技术有限公司 A kind of method of local reduction's formwork
CN110293208A (en) * 2019-07-15 2019-10-01 深圳市万泽中南研究院有限公司 Shell side method processed and formwork for blade class casting investment pattern precision casting

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JP2001252757A (en) * 2000-03-07 2001-09-18 Ishikawajima Harima Heavy Ind Co Ltd Method for manufacturing blade lattice structural body
CN103071765A (en) * 2012-12-27 2013-05-01 清华大学 Partial air cooling method for precast aperture passage in investment casting shell
CN103252451B (en) * 2013-05-23 2016-06-15 沈阳黎明航空发动机(集团)有限责任公司 A kind of manufacture method of low pressure guiding triplet hollow blade
CN103495702B (en) * 2013-10-11 2016-10-05 西安航空动力股份有限公司 A kind of precision-investment casting method changing casting solidification radiating condition
CN105583672B (en) * 2014-10-23 2018-01-23 沈阳黎明航空发动机(集团)有限责任公司 A kind of localization method of conjuncted guide vane
CN104399889B (en) * 2014-11-07 2016-06-22 沈阳黎明航空发动机(集团)有限责任公司 A kind of hulling method after the conjuncted blade model casting of aero-engine
CN204220932U (en) * 2014-11-11 2015-03-25 沈阳黎明航空发动机(集团)有限责任公司 A kind of six conjuncted guide vane casting moulding systems
CN105290337B (en) * 2015-11-16 2017-07-25 沈阳黎明航空发动机(集团)有限责任公司 A kind of concatermer blade casting method
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
CN107008857B (en) * 2017-04-17 2020-11-10 东方电气集团东方汽轮机有限公司 Ceramic mould shell capable of eliminating casting hot cracking defect of variable cross-section part and forming method thereof

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