CN103586413A - Precision casting method for multi-cavity structural part - Google Patents

Precision casting method for multi-cavity structural part Download PDF

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Publication number
CN103586413A
CN103586413A CN201310577104.4A CN201310577104A CN103586413A CN 103586413 A CN103586413 A CN 103586413A CN 201310577104 A CN201310577104 A CN 201310577104A CN 103586413 A CN103586413 A CN 103586413A
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wax
pattern
cavity
casting
cavity structural
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CN103586413B (en
Inventor
郝新
雷四雄
贺峥嵘
闫彬
唐双双
龙宪翼
周坚
蔡瑜
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AECC South Industry Co Ltd
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China National South Aviation Industry Co Ltd
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Abstract

The invention discloses a precision casting method for a multi-cavity structural part. The precision casting method for the multi-cavity structural part comprises the following steps: ceramic cores are prepared; multi-cavity structural part wax molds are designed and manufactured, and a plurality of cavities are formed in a manner that steel cores are placed inside each wax mold; the multi-cavity wax molds are obtained through pressing; the pre-prepared ceramic cores are placed inside the cavities of the wax molds, and gaps between the ceramic cores and the wax molds and at the openings of the cavities are sealed through adhesive wax; the wax molds with the ceramic cores are combined into a tree group in a certain manner; the outer surface of the tree group is repeatedly subjected to sizing coating, stuccoing and drying, so as to form a housing which covers the whole outer surfaces of the wax molds and has at least one reserved opening for pouring and/or discharging; the housing is sintered, and the melted wax molds are discharged from the opening, so as to form a hollow housing with the opening; the temperature of the housing is kept, and an alloy material for casting the multi-cavity structural part is melted and poured into the hollow housing until the hollow housing is full of the alloy material; the housing and the ceramic cores are removed after cooling; the multi-cavity structural part is formed.

Description

A kind of casting method of cavity structural member
Technical field
The present invention relates to precision casting technology field, especially, relate to a kind of unitarily formed casting method with a plurality of identical die cavities.
Background technology
In aviation field, have many one-piece parts with a plurality of identical die cavities, these parts are many by hot investment casting moulding, and because the element precision requirement of aviation field is all very high, once any link existing problems in casting process all can cause scrapping of part.
At present, the traditional precision casting molding method of cavity structural member has two kinds:
Adopt a ceramic core, ceramic core is put into the making mould of wax-pattern, compacting wax-pattern; Coating dewaxing form shell, and smelting and pouring then, obtains structural member after removing ceramic core at cleaning shell.For avoiding core shift in ceramic core die mould process to cause hole wall thickness ununiformity, form the necessary accurate positioning of ceramic core of cavity, so wax mould profiling die is very complicated, practical operation is also very loaded down with trivial details.In addition, require a plurality of ceramic cores all to possess higher room temperature strength, this just must carry out special room temperature strengthening, during with assurance compacting wax-pattern, any one core does not rupture, if core have a fracture whole wax-pattern scrap, must do over again, cause the wasting of resources and repeat operation.
The second is to adopt the moulding of water-soluble carbonyl core, and the water-soluble carbonyl core of preparation is put into Wax mold, compacting wax-pattern; By water-soluble carbonyl core molten removing from wax-pattern; Coating dewaxing form shell, and then smelting and pouring, obtains structural member.For avoiding water-soluble carbonyl core core shift in wax-pattern die mould process to cause die cavity wall unevenness problem, form the necessary accurate positioning of water-soluble carbonyl core of cavity in the same manner, so wax mould profiling die is also very complicated, practical operation is also very loaded down with trivial details.In addition, this kind of method cannot the thin longer die cavity of moulding, because slim-lined construction space is narrower, the intensity that during coating, form strength does not also reach cast has just been filled up whole die cavity, so aluminium alloy washes away the shell mould in die cavity to cause foundry goods bleed-out to scrap during cast.
Summary of the invention
The object of the invention is to provide a kind of casting method of cavity structural member, easily ruptures, the technical problem of elongated die cavity coating difficulty great Yi bleed-out to solve core core in wax-pattern pressing process.
For achieving the above object, the technical solution used in the present invention is as follows:
A casting method for cavity structural member, comprises the following steps: a, according to the cavity structure of cavity structural member, manufacture and design the mould of ceramic core, and prepare ceramic core; The die cavity of b, described cavity structural member adopts and is located at the steel-cored shaped in wax-pattern, according to the wax-pattern of described cavity structural member press belt die cavity and split out steel core; C, described ceramic core is put into the die cavity of described wax-pattern, the die cavity opening of described wax-pattern is sealed with wax and is closed the gap between described ceramic core and described wax-pattern by bonding; D, to described wax-pattern combination tree in groups, at described group of tree outer surface, be coated with slip, form the tree outer surface of covering group completely and be reserved with at least one in order to the shell of the opening of cast and/or discharge; E, described shell is carried out to sintering from the opening of described shell, the group that comprises described wax-pattern of fusing is set formation with the interior casement shell of opening; F, keep the temperature of described interior casement shell, will be for pouring into a mould the alloy material melting of the described cavity structural member of casting and being poured in described interior casement shell and being full of described interior casement shell; G is until the group tree part outside described structural member is excised in cooling rear shelling; H, remove described ceramic core and form described cavity structural member.
Further, in step a, the die cavity of cavity structural member is the inner small and outside big linear pattern cavity of radial dimension or crooked die cavity; The steel core adopting in step b is also linear pattern steel core or crooked steel core corresponding to the structure of the die cavity of cavity structural member; In step b, steel core forms from the whole demoulding of wax-pattern one side the channel shaped cavities of exposing wax-pattern surface.
Further, in step c, on the outer surface of ceramic core, be suppressed with the cover plate wax-pattern matching with channel shaped cavities; To with the ceramic core of cover plate wax-pattern, put into the channel shaped cavities of wax-pattern, the position between cover plate wax-pattern and wax-pattern contact site and ceramic core and wax-pattern is all with the sealing of bonding wax bonding.
Further, the length of ceramic core is greater than the die cavity length of cavity structural member, and when ceramic core is put in the die cavity of wax-pattern, ceramic core reaches wax-pattern outside from the opening of wax-pattern die cavity.
Further, the cavity that the die cavity of cavity structural member and the die cavity of wax-pattern are slim-lined construction.
Further, cavity structural member is at least with the die cavity of a slim-lined construction.
Further, in step f, empty shaping mould in rotation, makes to enter into the inner chamber that alloy molten solution in interior empty shaping mould is uniformly distributed in interior empty shaping mould.
Further, interior empty shaping mould is along unidirectional or multidirectional rotary.
Further, in the time of the interior empty shaping mould of rotation, pour into a mould the alloy molten solution after melting, or the alloy molten solution after the interior empty shaping mould of rotation and cast melting hockets.
Further, before interior empty shaping mould rotation, seal in the opening of empty shaping mould.
The present invention has following beneficial effect:
The casting method of this cavity structural member utilizes steel core supporting and location die cavity, save the step of setting positioner for each ceramic core or water-soluble core, can be good at solving core core shift in wax-pattern pressing process, the problem of fracture, wax-pattern after compressing again toward placing ceramic core in die cavity, can not produce external force pressure to ceramic core, the requirement of strength of ceramic core is low, simplified in traditional handicraft and also need to carry out for ceramic core the step of room temperature strengthening, avoided conventional method because ceramic core room temperature strength causes the problem of the disconnected core of die mould not, also solved traditional casting method, the die cavity shell mould thickness of slim-lined construction does not also reach the intensity of appointment and has just filled up whole die cavity, during cast, high temperature alloy liquid is easy to wash away the shell in die cavity, thereby causes bleed-out defect, the problem that causes part to be scrapped.If there is gap between wax-pattern and core, when being coated with slip, slip easily enters into formation slurry piece in gap, during cast, aluminium alloy takes slurry piece to part position, easily cause dreg defect, adopt bonding to seal with wax and close the gap between ceramic core and wax-pattern, by bonding wax plugging gap, can be good at solving slag inclusion phenomenon, thereby guarantee the qualification rate of finished product, reduce manufacturing cost; The temperature of empty shaping mould in keeping in the process of alloy material smelting and pouring, prevents that alloy molten solution from touching low temperature environment and with regard to direct condensation, causing cold shut even to owe casting, causes and pours into a mould unsuccessfully; The mould of whole casting method is simplified, make simple to operate, casting accuracy is high, product percent of pass is high, without frequently doing over again, has shortened the production cycle, has reduced raw material and artificial waste, has saved production cost.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structured flowchart of casting method of the cavity structural member of the preferred embodiment of the present invention;
Fig. 2 is the structural representation of the ceramic core of the preferred embodiment of the present invention;
Fig. 3 is that the A-A of Fig. 2 is to cutaway view;
Fig. 4 is the structural representation of the wax-pattern of the preferred embodiment of the present invention;
Fig. 5 is that the B-B of Fig. 4 is to cutaway view;
Fig. 6 is the structural representation of ceramic core of the cover plate wax-pattern of the preferred embodiment of the present invention.
Marginal data:
1, ceramic core; 2, wax-pattern; 3, cover plate wax-pattern.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Fig. 1 is the structured flowchart of casting method of the cavity structural member of the preferred embodiment of the present invention; Fig. 2 is the structural representation of the ceramic core of the preferred embodiment of the present invention; Fig. 3 is that the A-A of Fig. 2 is to cutaway view; Fig. 4 is the structural representation of the wax-pattern of the preferred embodiment of the present invention; Fig. 5 is that the B-B of Fig. 4 is to cutaway view; Fig. 6 is the structural representation of ceramic core of the cover plate wax-pattern of the preferred embodiment of the present invention.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the casting method of the cavity structural member of the present embodiment, comprises the following steps: a, according to the cavity structure of cavity structural member, manufacture and design the mould of ceramic core 1, and prepare ceramic core 1; The die cavity of b, described cavity structural member adopts and is located at the steel-cored shaped in wax-pattern 2, according to the wax-pattern 2 of described cavity structural member press belt die cavity and split out steel core; C, described ceramic core 1 is put into the die cavity of described wax-pattern 2, the die cavity opening of described wax-pattern 2 is sealed with wax and is closed the gap between described ceramic core 1 and described wax-pattern 2 by bonding; D, to described wax-pattern 2 according to certain arrangement mode combination tree in groups, at described group of tree outer surface, be coated with slip, form the tree outer surface of covering group completely and be reserved with at least one in order to the shell of the opening of cast and/or discharge; E, described shell is carried out to sintering from the opening of described shell, the group that comprises described wax-pattern 2 of fusing is set formation with the interior casement shell of opening; F, keep the temperature of described interior casement shell, will be for pouring into a mould the alloy material melting of the described cavity structural member of casting and being poured in described interior casement shell and being full of described interior casement shell; G is until the group tree part outside described structural member is excised in cooling rear shelling; H, remove described ceramic core 1 and form described cavity structural member.The casting method of this cavity structural member utilizes steel core supporting and location die cavity, saves the step of setting positioner for each ceramic core 1, can be good at solving the problem of core bias in wax-pattern 2 pressing processes, die cavity accurate positioning, and registration is high; Wax-pattern 2 compressing again toward placing ceramic core 1 in die cavity, can not produce external force pressure to ceramic core 1, the requirement of strength of ceramic core 1 is low, simplify the step that also need to carry out room temperature strengthening for ceramic core 1 in traditional handicraft, avoided conventional method because ceramic core 1 room temperature strength causes the problem of the disconnected core of die mould not; Also solved traditional casting method, the die cavity shell mould thickness of slim-lined construction does not also reach the intensity of appointment and has just filled up whole die cavity, during cast, high temperature alloy liquid is easy to wash away the shell in die cavity, thereby causes bleed-out defect, the problem that causes part to be scrapped.If there is gap between wax-pattern 2 and ceramic core 1, when being coated with slip, slip easily enters into formation slurry piece in gap, during cast, aluminium alloy takes slurry piece to part position, easily cause dreg defect, adopt bonding to seal with wax and close the gap between ceramic core 1 and wax-pattern 2, by bonding wax plugging gap, can be good at solving slag inclusion phenomenon, thereby guarantee the qualification rate of finished product, reduce manufacturing cost; The temperature of empty shaping mould in keeping in the process of alloy material smelting and pouring, prevents that alloy molten solution from touching low temperature environment and with regard to direct condensation, causing cold shut even to owe casting, causes and pours into a mould unsuccessfully; The mould of whole casting method is simplified, simple to operate, casting accuracy is high, product percent of pass is high, without frequently doing over again, shortened the production cycle, reduced raw material and artificial waste, saved production cost.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, in the present embodiment, in step a, the die cavity of cavity structural member is the inner small and outside big linear pattern cavity of radial dimension or crooked die cavity.The steel core adopting in step b is linear pattern steel core or crooked steel core corresponding to the structure of the die cavity of cavity structural member; For die cavity, be the inner small and outside big linear pattern cavity of radial dimension, after wax-pattern 2 is compressing, can carry out by the die cavity opening from wax-pattern 2 demoulding of steel core and putting into of ceramic core 1.
As shown in Fig. 1 and Fig. 6, in the present embodiment, for the die cavity of cavity structural member, be the inner small and outside big crooked die cavity of radial dimension, can from wax-pattern 2 sides, deviate from by integral body, ceramic core 1 cover plate wax-pattern 3 is put into the die cavity of wax-pattern 2, and whole manufacturing process is simple and convenient.In step b, steel core forms from the whole demoulding of wax-pattern 2 one sides the channel shaped cavities of exposing wax-pattern 2 surfaces; In step b, on the outer surface of ceramic core 1, be suppressed with the cover plate wax-pattern 3 matching with channel shaped cavities; Ceramic core with cover plate wax-pattern 31 is put into the channel shaped cavities of wax-pattern 2, the position between cover plate wax-pattern 3 and wax-pattern 2 contacts site and ceramic core 1 and wax-pattern 2 is all with the sealing of bonding wax bonding.Because the cavity design of cavity structural member is with there being mutual annexation between crooked radian or die cavity, therefore be not easy to carry out the demoulding of steel core and putting into of ceramic core 1 from the die cavity opening of wax-pattern 2, therefore the stripping means that adopts steel core to deviate from from wax-pattern 2 side integral body, and then the ceramic core with cover plate wax-pattern 31 is deviate to position integral body from steel core and put into, with cover plate wax-pattern 3, fill up the wall body of the die cavity disappearance of wax-pattern 2, then with bonding wax, repair bonding and plugging gap, to complete the step that wax-pattern 2 moulding and surface integral is coated with to slurry, thereby by replacing the mode of wax-pattern 2, obtain the cavity structural member finished product with crooked die cavity of moulding by casting.The scope of application of casting method is wider.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, the length of ceramic core 1 is greater than the die cavity length of cavity structural member, and when ceramic core 1 is put in the die cavity of wax-pattern 2, ceramic core 1 reaches wax-pattern 2 outsides from the opening of wax-pattern 2 die cavities.Facilitate putting into and deviating from of ceramic core 1, make manufacture craft simpler, thereby accelerate casting speed, shorten the production cycle.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, the cavity that the die cavity of cavity structural member is slim-lined construction.Adopt this casting method to be equally also applicable to slim-lined construction, die cavity replaces solvable core moulding with ceramic core 1, avoids investment shell intensity by aluminium alloy, to be washed away not the phenomenon that causes bleed-out to cause product rejection.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, the structural member that cavity structural member is slim-lined construction.This casting method can be suitable for equally for elongated structural member.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, in step f, empty shaping mould in rotation, makes to enter into the inner chamber that alloy molten solution in interior empty shaping mould is uniformly distributed in interior empty shaping mould.By rotating interior empty shaping mould, the alloy molten solution entering from the opening of interior empty shaping mould can be uniformly distributed in the cavity of interior empty shaping mould, reduce the probability of bleed-out.Also can adopt gravity or vacuum pouring under interior empty shaping mould stationary state.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, interior empty shaping mould is along unidirectional or multidirectional rotary.Interior empty shaping mould is by unidirectional or multidirectional rotation, makes alloy molten solution can enter into uniformly each corner of interior empty shaping mould, guarantees the quality of product.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, pour into a mould the alloy molten solution after melting when empty shaping mould in rotation, the alloy molten solution or in rotation after empty shaping mould and cast melting hockets.According to the design feature of structural member, by different cast, make alloy molten solution can be filled into fully each corner of interior empty shaping mould, to guarantee the quality of product.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, the opening of empty shaping mould in sealing before interior empty shaping mould rotation.Alloy molten solution is not easy to splash or lose, to guarantee the quality of cast.
During enforcement, precision casting molding method comprises the following steps: 1, design the mfg. moulding die of ceramic core 1 and prepare ceramic core 1: according to the mould of the structural design ceramic core 1 of die cavity, adopt this mould press ceramic core 1, ceramic core 1 is through sinter molding; 2, design the mfg. moulding die of wax-pattern 2 and suppress wax-pattern 2: during compacting wax-pattern 2, the hole of wax-pattern 2 is by mould steel-cored shaped; 3, the core of step 1 preparation is put into the die cavity of the wax-pattern 2 of step 2 compacting, bore edges is sealed with wax dead by bonding, and while preventing coating, slurry enters in the gap in core and hole; 4, wax-pattern combination: carry out wax-pattern combination according to technique; 5, shell processed, smelting and pouring, post processing and depoling obtain the hot investment casting single piece with cavity.
If die cavity is crooked, forming method comprises the following steps: 1, design the mould of ceramic core 1 and prepare ceramic core 1: according to the mould of the structural design ceramic core 1 in hole, adopt this mould press ceramic core 1, ceramic core 1 is through sinter molding; 2, the mould of design agents wax-pattern 2: the steel-cored shaped of the part face in hole in the mould of main body wax-pattern 2; 3, the mould of design cover plate wax-pattern 3: its lap in hole is by 3 moulding of cover plate wax-pattern; 4, compacting cover plate wax-pattern 3: the ceramic core 1 of step 1 preparation is put into the mould of step 3 cover plate wax-pattern 3, compacting cover plate wax-pattern 3; 5, compacting main body wax-pattern 2 assembled cover plate wax-pattern 3: adopt step 2 mould compacting main body wax-pattern 2, and the cover plate wax-pattern 3 of step 4 preparation is put into the part face in hole described in step 2 together with ceramic core 1, side edge thereof is welded in to the edge of part face with bonding wax, bore edges is sealed with wax dead by bonding; 6, subsequent step is identical with aforesaid step 4 and step 5, obtains the hot investment casting single piece with cavity.
Ceramic core 1 does not need to carry out room temperature strengthening.Single piece is with at least one die cavity.
The invention solves two kinds of problems that method exists in prior art, and the mould of wax-pattern 2 saves a plurality of ceramic core 1 positioners, mould simplification; Ceramic core 1, without adopting room temperature strengthening just can reach instructions for use, has avoided conventional method because ceramic core 1 room temperature strength is inadequate, the disconnected core problem of die mould causing; Shorten the production cycle, cost-saving.Adopt this method slim-lined construction die cavity to fill up with ceramic core 1, do not have insufficient strength cast bleed-out situation.Product percent of pass is high, and without doing over again, effect is remarkable.
Embodiments of the invention one: certain casing has 31 of ascending variable cross-section clear openings for one week, adopt forming method of the present invention: first prepare ceramic core 1 as shown in Figure 2,3, then suppress wax-pattern 2 as shown in Figure 4,5, then ceramic core 1 is inserted in 2 three ten one through holes of wax-pattern, through hole edge is shut, organize again mould, shell processed, smelting and pouring, post processing and depoling, obtain the hot investment casting single piece with 31 through holes.
Embodiments of the invention two: certain whole precision castings structure has eight crooked die cavities for one week, adopt the inventive method: first preparation is as Fig. 6 ceramic core 1, and compacting is as Fig. 6 cover plate wax-pattern 3, suppress again main body wax-pattern 2, main body wax-pattern 2 has been taken the left surface of crooked die cavity out of, three faces in right flank and bottom surface, cover plate wax-pattern 3 is put into main body wax-pattern 2 correspondence positions together with ceramic core 1, with bonding wax, edge on the cover plate left side and left surface is shut, on cover plate the right and right flank, shut on edge, organize again mould, shell processed, smelting and pouring, post processing and depoling, obtain the hot investment casting single piece with some crooked die cavities.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a casting method for cavity structural member, is characterized in that, comprises the following steps:
A, according to the cavity structure of cavity structural member, manufacture and design the mould of ceramic core (1), and prepare ceramic core (1);
The die cavity of b, described cavity structural member adopts the steel-cored shaped of being located in wax-pattern (2), according to the wax-pattern (2) of described cavity structural member press belt die cavity and split out steel core;
C, described ceramic core (1) is put into the die cavity of described wax-pattern (2), the die cavity opening of described wax-pattern (2) is sealed with wax and is closed the gap between described ceramic core (1) and described wax-pattern (2) by bonding;
D, to described wax-pattern (2) combination tree in groups, at described group of tree outer surface, be coated with slip, form the tree outer surface of covering group completely and be reserved with at least one in order to the shell of the opening of cast and/or discharge;
E, described shell is carried out to sintering from the opening of described shell, the group that comprises described wax-pattern (2) of fusing is set formation with the interior casement shell of opening;
F, keep the temperature of described interior casement shell, will be for pouring into a mould the alloy material melting of the described cavity structural member of casting and being poured in described interior casement shell and being full of described interior casement shell;
G is until the group tree part outside described structural member is excised in cooling rear shelling;
H, remove described ceramic core (1) and form described cavity structural member.
2. the casting method of cavity structural member according to claim 1, is characterized in that,
The die cavity of cavity structural member described in described step a is the inner small and outside big linear pattern cavity of radial dimension or crooked die cavity;
The described steel core adopting in described step b is also linear pattern steel core or crooked steel core corresponding to the structure of the die cavity of cavity structural member;
In described step b, described steel core forms from the whole demoulding of described wax-pattern (2) one sides the channel shaped cavities of exposing described wax-pattern (2) surface.
3. the casting method of cavity structural member according to claim 2, is characterized in that,
On the outer surface of ceramic core described in described step c (1), be suppressed with the cover plate wax-pattern (3) matching with described channel shaped cavities:
Described ceramic core (1) with described cover plate wax-pattern (3) is put into the described channel shaped cavities of described wax-pattern (2),
Position between described cover plate wax-pattern (3) and described wax-pattern (2) contact site and described ceramic core (1) and described wax-pattern (2) is all with the sealing of bonding wax bonding.
4. according to the casting method of the cavity structural member described in any one in claims 1 to 3, it is characterized in that,
The length of described ceramic core (1) is greater than the die cavity length of described cavity structural member,
When described ceramic core (1) is put in the die cavity of described wax-pattern (2),
Described ceramic core (1) reaches described wax-pattern (2) outside from the opening of described wax-pattern (2) die cavity.
5. according to the casting method of the cavity structural member described in any one in claims 1 to 3, it is characterized in that the cavity that the die cavity of the die cavity of described cavity structural member and described wax-pattern (2) is slim-lined construction.
6. according to the casting method of the cavity structural member described in any one in claims 1 to 3, it is characterized in that, described cavity structural member is with the die cavity of at least one slim-lined construction.
7. according to the casting method of the cavity structural member described in any one in claims 1 to 3, it is characterized in that, in described step f, rotate described interior casement shell, make to enter into the inner chamber that alloy molten solution in described interior casement shell is uniformly distributed in described interior casement shell.
8. the casting method of cavity structural member according to claim 7, is characterized in that, described interior empty shaping mould is along unidirectional or multidirectional rotary.
9. the casting method of cavity structural member according to claim 7, is characterized in that, pours into a mould the alloy molten solution after melting when rotating described interior empty shaping mould, or the alloy molten solution rotating after described interior empty shaping mould and cast melting hockets.
10. the casting method of cavity structural member according to claim 7, is characterized in that, the opening of the described interior empty shaping mould of sealing before described interior empty shaping mould rotation.
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