CN112405791B - Forming die and forming method for biscuit of hyper-hemispherical ceramic fairing - Google Patents
Forming die and forming method for biscuit of hyper-hemispherical ceramic fairing Download PDFInfo
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- CN112405791B CN112405791B CN202011051233.6A CN202011051233A CN112405791B CN 112405791 B CN112405791 B CN 112405791B CN 202011051233 A CN202011051233 A CN 202011051233A CN 112405791 B CN112405791 B CN 112405791B
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- 235000015895 biscuits Nutrition 0.000 title claims abstract description 44
- 239000000919 ceramic Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002002 slurry Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005245 sintering Methods 0.000 description 7
- 239000002775 capsule Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000001272 pressureless sintering Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001513 hot isostatic pressing Methods 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/28—Cores; Mandrels
- B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The invention provides a forming die and a forming method for a biscuit of an ultra-hemispherical ceramic fairing, which are used for solving the problem that the fairing with a complex shape is difficult to form in the prior art. The fairing biscuit forming die comprises a combined male die and a combined female die, wherein the combined male die consists of a positioning screw rod, an end cover, four side modules and a base module; the combined female die consists of two female die half-dies and a connecting fastener; the center of the circular end cover is provided with a through hole, and the periphery of the circular end cover is provided with an arc-shaped through hole and a positioning pin hole; the base module and the four side module are enclosed to form a hyper-hemispherical male die which is fixedly connected with the end cover through a positioning pin hole; the two female die half dies are enclosed to form a hyper-hemispherical female die, and are also fixedly connected with the end cover through positioning pin holes, and the end cover is provided with a feed inlet and an exhaust port which are communicated with the cavity. The biscuit prepared by the invention has the advantages of complete shape, uniform structure, no 'bubble out' phenomenon, high yield, easy demoulding after forming, repeated use of the mould, improved production efficiency and saved cost.
Description
Technical Field
The invention belongs to the field of fairing forming, and particularly relates to a forming die and a forming method for a biscuit of a hyper-hemispherical ceramic fairing.
Background
Fairings are aerodynamic surfaces used to reduce air drag and interference during high speed flight, and are commonly used in aerospace devices such as missile warheads, aircraft propellers, rockets, and the like. The fairing material has the characteristics of high strength and high hardness, and the machining method is very difficult to machine the optical fairing material, for example, the ultra-hemispherical missile fairing with large caliber and large opening angle has the disadvantages of complex process, high difficulty and high machining cost. Generally, a near net-size forming method is adopted to prepare a fairing biscuit with a complex shape, and then the biscuit is sintered to prepare the fairing.
The sintering process of the fairing comprises hot-pressing sintering, preforming, pressureless sintering, hot isostatic pressing sintering and the like. Among them, hot press sintering can generally produce only products having simple shapes, such as plate, column, ring, and shallow spherical cap shapes. Hot isostatic pressing sintering can be carried out by preparing a special material capsule, carrying out hot isostatic pressing sintering together with ceramic powder inside the capsule, and then removing the capsule material by using a mechanical or chemical method to obtain the ceramic fairing with a complex shape, but the method is time-consuming and labor-consuming in the processes of processing and removing the capsule besides high cost and expense, and the capsule cannot be reused. The preparation mode of pre-forming and pressureless sintering is that the forming process and the sintering process are relatively independent, and the pressureless sintering process can maintain the shape of a blank body in the forming stage, so that the preparation method is more suitable for preparing ceramics with complex shapes. For the fairing with a complex shape, the preparation method of preforming and pressureless sintering is more suitable.
The forming method of the fairing with the complex shape comprises extrusion forming, injection forming, pressure injection forming, gel injection molding and the like. The blank prepared by the gel injection molding method has the advantages of few defects, uniform components and density, less post processing of materials and suitability for forming of large-size ceramic with complex shape.
In the prior art, a gel injection molding process of a biscuit of an ultra-hemispherical fairing needs a special mold for ultra-hemispherical molding. The ultra-hemispherical biscuit has a large belly and a small mouth, and a male die (mold core) with the large belly can be taken out from the small mouth of the biscuit, and the integrity of the biscuit is ensured without being damaged. Usually, low-melting-point paraffin is selected to prepare a male die (wax core), and when the male die is demolded, the molten male die is removed by direct low-temperature heating. However, the above-mentioned mold has the following drawbacks in practical operation: (1) the paraffin has low melting point, is difficult to machine and maintain the precision; (2) destructive use, non-repeatable; (3) heating during demolding can lead to irreversible deformation or cracking of the biscuit due to rapid evaporation of water.
Disclosure of Invention
In view of the defects or shortcomings in the prior art, the invention aims to provide the forming die and the forming method for the biscuit of the hyper-hemispherical ceramic fairing.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a super hemispherical ceramic fairing biscuit forming mold, where the fairing biscuit forming mold includes a combined male mold and a combined female mold, where the combined male mold is composed of a positioning screw 1, an end cover 2, a first side module 51, a second side module 61, a third side module 52, a fourth side module 62, and a base module 7; the combined female die 8 consists of a first female die half 81, a second female die half 82 and a connecting fastener 9; wherein,
the end cover 2 is circular, the center of the end cover is provided with a through hole 21, the periphery of the end cover is provided with an arc-shaped through hole 3, and the inner circular surface is provided with a plurality of first positioning pin holes 41 and second positioning pin holes 42;
the base module 7 is in a convex bottom type segmental shape, the center of the upper end surface is provided with a thread non-through hole 71 limited by a positioning screw, and the outer circular surface of the upper end surface is provided with a trapezoidal groove 72;
the upper end surfaces and the lower end surfaces of the first side module 51, the second side module 61, the third side module 52 and the fourth side module 62 are planes and have the same height, and the four side modules can be enclosed end to form an outer circular ring surface; the upper end face of the base module 7 is provided with a plurality of positioning pin holes 53 and 63 which are matched with the lower end face of the end cover 2 through a first positioning pin hole 41, and the lower end face of the base module is provided with a plurality of positioning guide pillars 54 and 64 which are matched with a trapezoidal groove 72 on the upper end face of the base module 7;
the first female die half 81 and the second female die half 82 are enclosed to form a square female die with an ultra-hemispherical cavity 10 inside, and the upper end face of the square female die is provided with a positioning pin hole 83.
As a preferred embodiment of the present invention, the end cap 2, the first side module 51, the second side module 61, the third side module 52, the fourth side module 62, the base module 7, the first female mold half 81, and the second female mold half 82 are all made of organic transparent materials.
As a preferred embodiment of the invention, the thickness of a grouting cavity formed by positioning and assembling the combined male die and the combined female die is 5-15 mm.
As a preferred embodiment of the present invention, the trapezoidal groove 72 has a larger upper opening and a smaller lower opening, and the inclined plane forms an angle of 30-60 degrees with the horizontal plane.
As a preferred embodiment of the present invention, the feed inlet and the discharge outlet 3 on the end cap 2 are arc-shaped through holes with arc degrees smaller than 90 ° symmetrically distributed in the circumferential direction.
In a preferred embodiment of the present invention, the first female mold half 81 and the second female mold half 82 are sealed and installed with the connecting fastener 9, and an impermeable sealing ring is used, and an impermeable film is used at the seam when the first side module 51, the second side module 52, the third side module 61 and the fourth side module 62 are positioned and assembled.
As a preferred embodiment of the present invention, the first side module 51 and the third side module 52 are identical, and the second side module 61 and the fourth side module 62 are identical; the first female mold half 81 is identical to the second female mold half 82.
In a second aspect, the present invention further provides a method for forming a green body of an ultra-hemispherical ceramic fairing, the method using the green body forming mold of an ultra-hemispherical ceramic fairing as claimed in any one of claims 1 to 7 for gel injection molding.
As a preferred embodiment of the invention, the method comprises the following steps:
step S1, assembling a multi-module ultra-hemispherical ceramic fairing biscuit forming die;
step S2, preparing ceramic slurry;
step S3, injecting the ceramic slurry into the cavity through one of the feed inlets on the end cover, discharging the gas in the cavity and the redundant bubbles in the slurry through the remaining plurality of exhaust ports, and completing the gel casting process;
step S4, after the preset time is solidified and the forming is completed, the connecting fastener of the two female die half moulds is firstly detached, then the end covers and the two female die half moulds and the positioning pins between the end covers and the first side module, the second side module, the third side module and the fourth side module are pulled out, the positioning screws are screwed out, the end covers are detached, the four side modules are sequentially pulled out according to the detaching sequence, and finally the positioning screws are screwed into the base module to take out the base module, so that the mould detaching is completed.
As a preferred embodiment of the present invention, the step S1 includes:
and step S11, the positioning screw penetrates through the through hole of the end cover and is loosely connected with the thread non-through hole of the base module. Then, positioning guide columns of the first side module, the second side module, the third side module and the fourth side module are respectively connected with the trapezoidal grooves of the substrate module in an embedded mode;
step S12, rotating the end cover to make the first positioning pin holes respectively correspond to the positioning pin holes of the first side module, the second side module, the third side module and the fourth side module one by one, and positioning and connecting by using positioning pins; screwing down the positioning screw to obtain a combined male die hyper-hemispherical male die;
and step S13, placing the combined male die into the two female die half dies, connecting the combined male die with the two female die half dies in a positioning manner through a second positioning pin hole on the end cover and positioning pin holes on the first female die half die and the second female die half die, and finally connecting the first female die half die and the second female die half die in a sealing and clamping manner through connecting fasteners, wherein a cavity between the combined female die and the combined male die is an injection cavity.
The invention has the following beneficial effects:
(1) the mold is formed by combining a plurality of modules, is accurate in positioning, convenient and quick to assemble and disassemble, can be repeatedly used for many times, and overcomes the defects that the traditional hyper-hemispherical mold is damaged and used once, the process is complicated and the like; the formed biscuit is complete in shape and uniform in structure, the production efficiency is improved, and meanwhile, the cost is saved;
(2) the die is made of transparent organic glass, so that the die is light in weight, low in price, convenient to observe state change in the process, and capable of being adjusted in time, and the rate of finished biscuit products is improved;
(3) the mold is provided with the injection port and the exhaust port, so that the uniform filling of slurry in the mold and the smooth discharge of gas are facilitated in the grouting process, the phenomenon of 'bubble formation' is avoided, and the reliable guarantee is provided for obtaining a biscuit with a complete shape by molding;
(4) the sheet-shaped positioning guide post of the die ensures accurate positioning between the modules, the modules can more easily rotate by taking the guide post as a fulcrum during demoulding, and the trapezoidal groove provides enough moving space for the modules, so that the demoulding process is simple and rapid to operate;
(5) the molding method has the advantages of quick injection molding, accurate positioning, simple demolding operation and high production efficiency; the prepared hyper-hemispherical fairing biscuit has the advantages of complete shape, uniform structure, no 'bubble out' phenomenon and high yield.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is an exploded perspective view of a super-hemispherical ceramic fairing biscuit forming mold according to an embodiment of the invention;
FIG. 2 is a perspective view of a composite male mold according to an embodiment of the present invention;
figure 3 is a perspective view of the base module 7 of figure 2 incorporating the male tool;
FIG. 4 is an assembly view of a super-hemispherical ceramic fairing biscuit forming die in accordance with an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along the centerline A-A of FIG. 4;
FIG. 6 is a flow chart of a method for forming a green body of a hyper-hemispherical ceramic fairing in accordance with an embodiment of the present invention.
Description of reference numerals:
1. positioning a screw rod; 2. an end cap; 21. through holes: 3. a feed inlet (vent); 41.42. a positioning pin hole; 51.52. a first side module, a third side module; 53. a positioning pin hole; 54. positioning the guide post; 61.62. a second side module, a fourth side module; 63. a positioning pin hole; 64. positioning the guide post; 7. a base module; 71. the thread is not a through hole; 72. a trapezoidal groove; 81. a first female mold half; 82. a second female mold half; 83. a positioning pin hole; 9. connecting a fastener; 10. and a material injection cavity.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a forming die for a biscuit of a hyper-hemispherical ceramic fairing, which is particularly suitable for gel casting. The mould is formed by a plurality of module combinations, and the location is accurate, and easy dismounting is swift, and can used repeatedly many times, has eliminated a great deal of drawback of traditional hyper-hemispherical mould, and the biscuit shape that the preparation was obtained is complete, the structure is even, has practiced thrift the cost when having improved production efficiency.
Fig. 1 shows a perspective exploded view of the forming mold for a biscuit of a hyper-hemispherical ceramic fairing. As shown in fig. 1, the fairing biscuit forming die comprises a combined male die and a combined female die, wherein the combined male die consists of a positioning screw rod 1, an end cover 2, a first side module 51, a second side module 61, a third side module 52, a fourth side module 62 and a base module 7; the female mold assembly 8 is composed of a first female mold half 81, a second female mold half 82 and a connecting fastener 9.
As shown in fig. 1 and 2, the end cap 2 is circular, has a through hole 21 at the center, an arc-shaped through hole 3 at the outer periphery, and a plurality of first positioning pin holes 41 and second positioning pin holes 42 on the inner surface.
As shown in fig. 1 and 3, the base module 7 is a segment with a convex bottom, the center of the upper end surface is provided with a threaded blind hole 71 limited by a positioning screw, and the outer circular surface of the upper end surface is provided with a trapezoidal groove 72.
As shown in fig. 1 and 2, the upper and lower end surfaces of the first side module 51, the second side module 61, the third side module 52 and the fourth side module 62 are planar and have the same height, and the four side modules can be enclosed end to form an outer circular ring surface; the upper end face has a plurality of positioning pin holes 53, 63 which are matched with the lower end face of the end cover 2 through the first positioning pin holes 41, and the lower end face has a plurality of positioning guide posts 54, 64 which are matched with the trapezoidal groove 72 of the upper end face of the base module 7.
As shown in fig. 1 and 4, the first female mold half 81 and the second female mold half 82 can be enclosed to form a square female mold having an ultra-hemispherical cavity 10 therein, and the upper end surface of the square female mold has a positioning pin hole 83.
As shown in fig. 4 and 5, in the assembled state of the male mold, the positioning screw 1 penetrates through the central through hole 21 of the end cover 2 and is embedded into the limiting hole 71 in the center of the upper end face of the base module 7, and the outer convex surface of the base module 7 and the convex surface formed by enclosing the four side modules 51, 52, 61 and 62 form a super-hemispherical male mold, which is matched with the inner shape of the fairing. The diameter of the head of the positioning screw 1 is larger than that of the through hole 21, and after coordination, the bottom of the positioning screw 1 does not touch the bottom of the thread of the substrate module 7 without the through hole 71, so that the effect of fastening connection is achieved while accurate positioning is ensured.
In the female die combination state, the male die after combination is arranged between the two half female dies, the first female die half 81 and the second female die half 82 are tightly connected through the connecting fastener 9 to enclose to form a square female die with an ultra-hemispherical cavity 10 inside, and the ultra-hemispherical cavity 10 is matched with the outer shape of the fairing; the second positioning pin hole 42 of the end cover 2 is connected with the positioning pin hole 83 of the upper end face of the square female die through a positioning pin, so that the end cover 2 is fixed on the upper end face of the square female die. A plurality of circular-arc through holes 3 on the end cover 2 are communicated with the female die ultra-hemispherical cavity, so that the feeding and exhausting functions are realized, the uniform filling of slurry in a die and the smooth exhausting of gas in the grouting process are facilitated, the 'foam-holding' phenomenon is avoided, and the reliable guarantee is provided for the forming of a biscuit with a complete shape.
As described above, the end cap 2, the first side module 51, the second side module 61, the third side module 52, the fourth side module 62, the base module 7, the first female mold half 81, and the second female mold half 82 are all made of an organic transparent material. The quality is light, the price is low, the state change in the process is convenient to observe, the adjustment can be made in time, and the yield of the biscuit is improved.
The external shape of the hyper-hemispherical male die is matched with the internal shape of the fairing, the hyper-hemispherical concave cavity of the square female die is matched with the external shape of the fairing, and the diameter of the circular section of the base module 7, the diameter of the circular sections of the first side module 51, the second side module 61, the third side module 52 and the fourth side module 62 and the horizontal width are all smaller than the caliber of the port of the cavity groove 10 and have certain allowance in size, so that all module parts of the combined male die can be easily taken out from the port of the hyper-hemispherical biscuit during demoulding.
The thickness of a grouting cavity formed by positioning and assembling the combined male die and the combined female die is 5-15 mm. Therefore, the biscuit obtained by grouting is a thin-wall part with the thickness of 5-15 mm, and the purpose of near net size forming is achieved.
The trapezoid groove 72 is provided with a larger upper opening and a smaller lower opening, and the inclined plane and the horizontal plane form an included angle of 30-60 degrees.
The feed inlet and the discharge outlet 3 on the end cover 2 are arc-shaped through holes which are symmetrically distributed in the circumferential direction and have the radian smaller than 90 degrees.
When the first female die half 81 and the second female die half 82 are sealed and clamped by the connecting fastener 9, an anti-seepage sealing ring is used, and when the first side module, the second side module, the third side module and the fourth side module are positioned and assembled, anti-seepage films are used at seams to ensure the sealing property of the dies, so that material leakage cannot occur during grouting.
As shown in fig. 3, the positioning guide posts 64 and 54 on the lower end surfaces of the first side module, the second side module, the third side module and the fourth side module are thin-plate type and are respectively embedded and connected with the trapezoidal groove 72 on the base module 7. The design of the flake-shaped positioning guide posts ensures accurate positioning between modules, the modules can more easily rotate by taking the guide posts as fulcrums during demoulding, and the trapezoidal grooves provide enough moving space for the modules, so that the demoulding process is simple and rapid to operate.
Preferably, the first side module 51 and the third side module 52 are identical, and the second side module 61 and the fourth side module 62 are identical; the first female mold half 81 is identical to the second female mold half 82.
The biscuit forming die for the hyper-hemispherical ceramic fairing provided by the embodiment of the invention has the advantages that the prepared biscuit is complete in shape and uniform in structure, the demoulding is easy after the forming, the die can be repeatedly used, the production efficiency is improved, and the cost is saved.
The embodiment of the invention also provides a forming method of the biscuit of the hyper-hemispherical ceramic fairing, and the forming method adopts the forming die of the biscuit of the hyper-hemispherical ceramic fairing to carry out gel injection molding.
As shown in fig. 6, the method for forming a green body of a hyper-hemispherical ceramic fairing comprises the following steps:
step S1, the multi-module mold is assembled. The method specifically comprises the following steps:
and step S11, the positioning screw penetrates through the through hole of the end cover and is loosely connected with the thread non-through hole of the base module. Then, positioning guide columns of the first side module, the second side module, the third side module and the fourth side module are respectively connected with the trapezoidal grooves of the substrate module in an embedded mode;
step S12, rotating the end cover to make the first positioning pin holes respectively correspond to the positioning pin holes of the first side module, the second side module, the third side module and the fourth side module one by one, and positioning and connecting by using positioning pins; and screwing down the positioning screw to obtain the combined male die hyper-hemispherical male die.
And step S13, placing the combined male die into the two female die half dies, connecting the combined male die with the two female die half dies in a positioning manner through a second positioning pin hole on the end cover and positioning pin holes on the first female die half die and the second female die half die, and finally connecting the first female die half die and the second female die half die in a sealing and clamping manner through connecting fasteners, wherein a cavity between the combined female die and the combined male die is an injection cavity.
Step S2, preparing a ceramic slurry.
And step S3, injecting the ceramic slurry into the cavity through one of the feed inlets on the end cover, and discharging the gas in the cavity and the redundant bubbles in the slurry through a plurality of remaining exhaust ports to finish the gel casting process.
Step S4, after the preset time is solidified and the forming is completed, the connecting fastener of the two female die half moulds is firstly detached, then the end covers and the two female die half moulds and the positioning pins between the end covers and the first side module, the second side module, the third side module and the fourth side module are pulled out, the positioning screws are screwed out, the end covers are detached, the four side modules are sequentially pulled out according to the detaching sequence, finally the positioning screws are screwed into the base module, the base module is taken out, and the ultra-hemispherical ceramic fairing biscuit can be easily obtained. The whole demoulding process is simple and convenient, and the mould can be recovered so as to be continuously used next time.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (10)
1. The ceramic fairing biscuit forming die is characterized by comprising a combined male die and a combined female die, wherein the combined male die consists of a positioning screw rod (1), an end cover (2), a first side module (51), a second side module (61), a third side module (52), a fourth side module (62) and a base module (7); the combined female die consists of a first female die half (81), a second female die half (82) and a connecting fastener (9); wherein,
the end cover (2) is circular, the center of the end cover is provided with a through hole (21), the periphery of the end cover is provided with arc-shaped through holes serving as a feed port and an exhaust port (3), and the inner circular surface of the end cover is provided with a plurality of first positioning pin holes (41) and second positioning pin holes (42);
the base module (7) is in a convex bottom type segmental shape, the center of the upper end face is provided with a thread blind hole (71) limited by a positioning screw rod, and the outer circular face of the upper end face is provided with a trapezoidal groove (72);
the upper end surfaces and the lower end surfaces of the first side module (51), the second side module (61), the third side module (52) and the fourth side module (62) are planes and have the same height, and the four side modules can be enclosed end to form an outer annular surface; the upper end face of the base module is provided with a plurality of positioning pin holes (53, 63) which are matched with the lower end face of the end cover (2) through a first positioning pin hole (41), and the lower end face of the base module is provided with a plurality of positioning guide pillars (54, 64) which are matched with a trapezoidal groove (72) on the upper end face of the base module (7);
the first female die half die (81) and the second female die half die (82) are enclosed to form a square female die, the inner portion of the square female die is provided with an ultra-hemispherical cavity serving as a material injection cavity (10), and the upper end face of the square female die is provided with a positioning pin hole (83).
2. The ceramic fairing biscuit forming mold of claim 1, characterized in that the end cap (2), the first side module (51), the second side module (61), the third side module (52), the fourth side module (62), the base module (7), the first female mold half (81) and the second female mold half (82) are all made of organic transparent material.
3. The ceramic fairing biscuit forming die of claim 1, wherein the combined male die and the combined female die are positioned and assembled to form a grouting cavity with a thickness of 5mm to 15 mm.
4. The ceramic fairing biscuit molding die of claim 1, wherein the trapezoid groove (72) has a larger upper opening and a smaller lower opening, and the inclined plane forms an angle of 30-60 ° with the horizontal plane.
5. The biscuit forming die for the hyper-hemispherical ceramic fairing according to claim 1, characterized in that the feeding port and the exhaust port (3) on the end cover (2) are arc-shaped through holes with arc degrees smaller than 90 degrees and symmetrically distributed in the circumferential direction.
6. The ceramic fairing biscuit forming mold of claim 1, wherein the first female mold half (81) and the second female mold half (82) are sealed and clamped by the connecting fastener (9) by using an impermeable sealing ring, and the first side module (51), the second side module (61), the third side module (52) and the fourth side module (62) are positioned and assembled by using an impermeable film at the joint.
7. The super-hemispherical ceramic fairing biscuit forming mold of claim 1 wherein said first side module (51) and third side module (52) are identical, and said second side module (61) and fourth side module (62) are identical; the first female mold half (81) is identical to the second female mold half (82).
8. A method for forming a green body of an ultra-hemispherical ceramic fairing, characterized in that the method uses the green body forming mold of an ultra-hemispherical ceramic fairing according to any one of claims 1 to 7 for gel injection molding.
9. The method of forming a green hyper-hemispherical ceramic fairing body as recited in claim 8, comprising the steps of:
step S1, assembling a multi-module ultra-hemispherical ceramic fairing biscuit forming die;
step S2, preparing ceramic slurry;
step S3, injecting the ceramic slurry into the cavity through one of the feed inlets on the end cover, discharging the gas in the cavity and the redundant bubbles in the slurry through the remaining plurality of exhaust ports, and completing the gel casting process;
step S4, after the preset time is solidified and the forming is completed, the connecting fastener of the two female die half modules is firstly detached, then the end covers and the two female die half modules and the positioning pins between the end covers and the first side module, the second side module, the third side module and the fourth side module are pulled out, the positioning screws are screwed out, the end covers are detached, the four side modules are sequentially pulled out according to the detaching sequence, and finally the positioning screws are screwed into the base module to take the base module out, so that the die detaching is completed.
10. The method of green hyper-hemispherical ceramic fairing forming process as claimed in claim 9, wherein said step S1 comprises:
step S11, the positioning screw rod passes through the through hole of the end cover and is loosely connected with the thread non-through hole of the base module; then, positioning guide columns of the first side module, the second side module, the third side module and the fourth side module are respectively connected with the trapezoidal grooves of the substrate module in an embedded mode;
step S12, rotating the end cover to make the first positioning pin holes respectively correspond to the positioning pin holes of the first side module, the second side module, the third side module and the fourth side module one by one, and positioning and connecting by using positioning pins; screwing down the positioning screw to obtain a combined male die hyper-hemispherical male die;
and step S13, placing the combined male die into the two female die half dies, connecting the combined male die with the two female die half dies in a positioning manner through a second positioning pin hole on the end cover and positioning pin holes on the first female die half die and the second female die half die, and finally connecting the first female die half die and the second female die half die in a sealing and clamping manner through connecting fasteners, wherein a cavity between the combined female die and the combined male die is an injection cavity.
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