CN106313276A - Die for preparing large-size tubular green bodies through gel casting - Google Patents
Die for preparing large-size tubular green bodies through gel casting Download PDFInfo
- Publication number
- CN106313276A CN106313276A CN201510359730.5A CN201510359730A CN106313276A CN 106313276 A CN106313276 A CN 106313276A CN 201510359730 A CN201510359730 A CN 201510359730A CN 106313276 A CN106313276 A CN 106313276A
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- inner core
- chassis
- mould
- external mold
- green compact
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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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
- B28B1/261—Moulds therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
The invention discloses a die for preparing large-size tubular green bodies through gel casting. The die comprises a chassis, an outer die and an inner core. The outer die is detachably installed on the chassis. The outer die is provided with a cylindrical inner cavity. The inner core is located in the inner cavity of the outer die, and the inner core and the outer die are coaxially installed on the chassis. The space formed among the inner wall of the outer die, the outer wall of the inner core and the chassis is used as a die cavity where slurry is injected. The die for preparing the large-size tubular green bodies through gel casting is applied to the water-based gel casting technology and is convenient to disassemble and small in die removal resistance, and the green bodies are not likely to be deformed and cracked when dried.
Description
Technical field
The present invention relates to Forming Processes of Fine Ceramics technical field, particularly relate to a kind of gel casting forming and prepare the mould of large scale tubulose green compact.
Background technology
Nineteen nineties, a kind of brand-new ceramic material wet-forming technique Gelcasting Technique (Gelcasting) of the M. A. Jenny of U.S.'s Oak Ridge National Laboratory (Oak Ridge National Laboratory) and Omatete teaching inventive, it is the perfect adaptation of traditional grouting process and organic chemistry high polymerization theory, by introducing a kind of new sizing mechanism, develop traditional slip-casting shaping process.Its ultimate principle be high solid loading (volume fraction be not less than 50%), low viscosity (at 1 Pa about s) ceramic size in, mix organic monomer and the cross-linking agent of low concentration, after adding initiator and catalyst and casting, there is home position polymerization reaction under certain conditions in the organic monomer in slurry, form firm tridimensional network, so that suspended substance in-situ solidifying molding, obtain uniform, the ceramic body of high intensity, near net-shape.Then carry out the demoulding, dry, organics removal, sintering, can be prepared by required ceramic part.
The mould of gel casting forming selects more wide in range, the structure of good seal may be used to Design of Dies in theory, the material used includes metal, polypropylene, the material such as Teflon, in general, owing to slip is weak acid or alkalescence, it is not recommended that use metal die, and weight is relatively big, is not easy to produce continuously；And macromolecule material to there is thermal conductivity little, uneven situation of conducting heat.
After the shortcoming of gel injection molding and forming technology is gel, green strength is relatively low, if preparing complicated shape (such as tubulose) green compact, easily occur that upper and lower bottom water divides the speed difference of evaporation, cause the intensity gradient gone to the bottom, ultimately resulting in the situation of green compact cracking, when particularly preparing large scale (highly ＞ 200mm) tubulose green compact, this phenomenon becomes apparent from.
Chinese invention patent application publication number CN1824486A improves a kind of water-base gel casting mould, this mould uses die cavity core rod to coordinate the design of anti-stick coating, but this mold weight is bigger, inconvenient operation, should not produce large scale green compact, and exist easily to smear because of anti-stick coating and too much cause material base surface pores defect or smear and very few make mould bring impurity and the problem such as the life-span is shorter into.
The difficult point of preparation large scale tubulose green compact also resides in the design of mold core, when preparing large scale tubulose green compact, in order to make the intensity of green compact higher, prolongs, so that moisture fully volatilizees in green compact after can selecting to try one's best the time point of the demoulding.But the contraction extrusion effect of core rod further substantially, thus can be caused the demoulding inconvenient by the volatilization tubulose green compact being as moisture, as can not be well controlled depoling process, then easily causes the cracking of green compact.This point is different from the demoulding in green compact manufacture of the small size ceramic electronic component greatly and processes.
In sum, current gel casting forming mould, there is problems in that
1, die cost is higher, and the life-span is the shortest；
2, green compact are inconvenient to loose core；
3, green compact uneven drying, easy to crack；
4, the green compact demoulding is inconvenient, yielding；
5, metals mold manufacturing is complicated, and weight is relatively big, is not easy to operation.
Summary of the invention
The present invention is directed to when gel casting forming prepares large scale tubulose green compact that stripping operation is inconvenient, easily the problems such as green compact uneven drying, serious cracking occur, provide a kind of gel casting forming and prepare the mould of tubulose green compact, mould release is convenient, ejection resistance is little, and is difficult to strain cracking occur when green compact are dried.
Indication large scale tubulose green compact of the present invention refer to that this tubulose green compact height is at more than 200mm.When using Gel-casting process, the weight of the slurry poured in mould is more than 20Kg.
For solving above-mentioned technical problem, the present invention provides a kind of gel casting forming to prepare the mould of large scale tubulose green compact, and described mould includes that chassis, external mold and inner core, described external mold are removably installed on described chassis；Described external mold has cylindrical cavity, and described inner core is positioned in the inner chamber of described external mold and is coaxially mounted on described chassis with described external mold；The inwall of described external mold, the outer wall of described inner core and and described chassis between formed space as inject slurry die cavity.
Further, described center chassis and described inner core relative position are provided with the ejecting mechanism that described inner core can eject tubulose green compact.
Further, described ejecting mechanism includes the pilot hole being positioned at described center chassis, and may pass through described pilot hole eject percussion hammer.
Further, eject percussion hammer surface described in and there is external screw thread；Described pilot hole has the female thread matched with the described external screw thread ejecting percussion hammer surface.
Further, described external mold and described inner core use polyurethane material to make.
Further, described inner core is hollow structure.
Further, it is provided with handle outside described external mold.
Further, described inner core top is provided with handle.
Further, described external mold is connected by fastening bolt with described chassis, also includes sealing ring between described external mold and described chassis.
Further, described inner core is connected by fastening bolt with described chassis, also includes sealing ring between described inner core and described chassis.
The preparation large scale tubulose green compact mould that the present invention provides, it is applied to water-base gel casting technique, there is following main feature: 1, external mold, inner core are connected with mould chassis detachable-type sealed, convenient disassembly, ejection resistance is little, can conveniently prepare large scale tubulose green compact, and green compact uniform drying, the most easy to crack；2, mould comprises ejecting mechanism, it is simple to operation of loosing core, it is to avoid occur that green compact shrink squeeze crack；3, when green compact are initially dried, intensity is less, can not apply external mold entirety unloaded on the premise of external force to green compact, it is to avoid the green compact deformation being likely to occur；4, the material of external mold and inner core is polyurethane, it is simple to processing and can ensure machining accuracy, polyurethane does not reacts with aqueous slurries, and wettability is poor, is convenient in demoulding, and die life is long.
Accompanying drawing explanation
Fig. 1 is the structural representation that the gel casting forming of the embodiment of the present invention one prepares the mould of large scale tubulose green compact.
Fig. 2 is the structural representation that the gel casting forming of the embodiment of the present invention two prepares the mould of large scale tubulose green compact.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present invention is further elaborated.
Embodiment one
As it is shown in figure 1, the mould that the gel casting forming of first embodiment of the invention prepares large scale tubulose green compact mainly includes chassis 3-1, external mold 2-1, inner core 1-1 tri-part.
In the present embodiment, external mold 2-1 is placed on the 3-1 of chassis, and external mold 2-1 bottom outside is provided with chimb, and this chimb is circumferentially provided with multiple installing hole, is fixed on the 3-1 of chassis by fastening bolt 3-2, and has external mold sealing ring 3-4 on contact surface, it is ensured that no leakage.Inner core 1-1 is fixed on 3-1 center, chassis, contact surface has inner core sealing ring 3-5, inner core 1-1 are fixed by fastening bolt 3-3 with chassis 3-1, it is ensured that no leakage.
Wherein, external mold 2-1 has cylindrical cavity, and inner core 1-1 is positioned in the inner chamber of external mold 2-1 and is coaxially mounted on the 3-1 of chassis with external mold 2-1.Aqueous slurries, as die cavity, is injected in die cavity by the space that the inwall of external mold 2-1, the outer wall of inner core 1-1 and mould chassis 3-1 and its non-intersection are formed, and forms ceramic tubular green compact.
In the present embodiment, external mold and inner core use the design that fastening bolt is fixed on chassis, can conveniently prepare large scale (highly ＞ 200mm) tubulose green compact, and green compact uniform drying, the most easy to crack.
It should be noted that in addition to the above-mentioned connected mode by fastening bolt, external mold 2-1 and inner core 1-1 can also be attached with chassis 3-1 by the mode such as grafting, socket.
Additionally, external mold 2-1 and inner core 1-1 all uses polyurethane material, it is possible to take into account intensity and heat conductivity, and very light in weight, it is simple to stripping operation.
Additionally, handle also can be designed outside external mold 2-1, it is simple to mould is carried.
Embodiment two
As in figure 2 it is shown, the mould that the gel casting forming of another embodiment of the present invention prepares large scale tubulose green compact includes chassis 3-1, external mold 2-1, inner core 1-1, also include the ejecting mechanism on chassis.Shown in Fig. 2, this ejecting mechanism includes the pilot hole at 3-1 center, chassis, and ejects percussion hammer 4-1, and this pilot hole is positioned on the 3-1 of chassis and inner core 1-1 opposite position, ejects percussion hammer 4-1 and may pass through pilot hole, for ejecting of inner core 1-1.
In addition, eject percussion hammer 4-1 surface and also can be provided with external screw thread, it is rotatably mounted on the 3-1 of chassis, the pilot hole at 3-1 center, chassis is provided with the female thread matched with the external screw thread ejecting percussion hammer surface, after green compact are dried certain time, eject percussion hammer 4-1 by turn, easily inner core 1-1 can be ejected tubulose green compact, complete depoling operation.Further, it is also possible to the lower end of inner core 1-1 is arranged to concave inward structure, in order to preferably inner core 1-1 is ejected tubulose green compact.
Being substantially the same as in the previous example, external mold 2-1 has cylindrical cavity, and inner core 1-1 is positioned in the inner chamber of external mold 2-1 and is coaxially mounted on the 3-1 of chassis with external mold 2-1.Aqueous slurries, as die cavity, is injected in die cavity by the space that the inwall of external mold 2-1, the outer wall of inner core 1-1 and mould chassis 3-1 and its non-intersection are formed, and forms ceramic tubular green compact.External mold 2-1 and inner core 1-1 can be fixed on the 3-1 of chassis by fastening bolt 3-2, fastening bolt 3-3, and has external mold sealing ring, inner core sealing ring on contact surface respectively, it is ensured that no leakage.Or, it would however also be possible to employ other connected modes such as grafting, socket.
Additionally, inner core 1-1 can be designed as hollow structure, reduce weight further.And upper end also can be provided with handle, it is simple to the operation such as loose core.
The above technical scheme using the present invention to propose, has the advantages that
1, mould external mold, inner core are connected with by the modes such as bolt seal and chassis are detachable, convenient disassembly, and ejection resistance is little；
2, when green compact are initially dried, intensity is less, can not apply external mold entirety unloaded on the premise of external force to green compact, it is to avoid the green compact deformation being likely to occur；
3, mold material is polyurethane, it is simple to processing and can ensure machining accuracy, polyurethane does not reacts with aqueous slurries, and wettability is poor, is convenient in demoulding, and die life is long；
4, by the design of ejecting mechanism, it is simple to green compact depoling, it is to avoid cause green compact to shrink squeeze crack；
5, directly can be taken off from chassis by green compact easily after green compact are dried, enter downstream, mould recycling rate of waterused is high；
6, being designed by core hollow formula, arrange the design such as external mold handle and inner core handle, when preparing large scale green compact, mold weight advantage light, convenient to operate becomes apparent from.
Above example is only used for being specifically described the present invention, and protection scope of the present invention is not played any restriction effect by it, and protection scope of the present invention is determined by claim.According to techniques known and technical scheme disclosed in this invention, can derive or association goes out many flexible programs, all these flexible programs, also being regarded as is protection scope of the present invention.
Claims (10)
1. a gel casting forming prepares the mould of large scale tubulose green compact, it is characterised in that described mould includes chassis, external mold and inner core,
Described external mold is removably installed on described chassis；
Described external mold has cylindrical cavity, and described inner core is positioned in the inner chamber of described external mold and is coaxially mounted on described chassis with described external mold；
The inwall of described external mold, the outer wall of described inner core and and described chassis between formed space as inject slurry die cavity.
Mould the most according to claim 1, it is characterised in that described center chassis and described inner core relative position are provided with the ejecting mechanism that described inner core can eject tubulose green compact.
Mould the most according to claim 2, it is characterised in that described ejecting mechanism includes the pilot hole being positioned at described center chassis, and may pass through described pilot hole eject percussion hammer.
Mould the most according to claim 3, it is characterised in that described in eject percussion hammer surface there is external screw thread；Described pilot hole has the female thread matched with the described external screw thread ejecting percussion hammer surface.
Mould the most according to claim 1, it is characterised in that described external mold and described inner core use polyurethane material to make.
6. according to the mould described in any one of claim 1,2,3,4 or 5, it is characterised in that described inner core is hollow structure.
Mould the most according to claim 6, it is characterised in that be provided with handle outside described external mold.
Mould the most according to claim 6, it is characterised in that described inner core top is provided with handle.
9., according to the mould described in any one of claim 1,2,3,4 or 5, it is characterised in that described external mold is connected by fastening bolt with described chassis, between described external mold and described chassis, also include sealing ring.
10., according to the mould described in any one of claim 1,2,3,4 or 5, it is characterised in that described inner core is connected by fastening bolt with described chassis, between described inner core and described chassis, also include sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510359730.5A CN106313276A (en) | 2015-06-26 | 2015-06-26 | Die for preparing large-size tubular green bodies through gel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510359730.5A CN106313276A (en) | 2015-06-26 | 2015-06-26 | Die for preparing large-size tubular green bodies through gel casting |
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| Publication Number | Publication Date |
|---|---|
| CN106313276A true CN106313276A (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510359730.5A Pending CN106313276A (en) | 2015-06-26 | 2015-06-26 | Die for preparing large-size tubular green bodies through gel casting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106994759A (en) * | 2017-04-12 | 2017-08-01 | 北京科技大学 | A kind of ceramic impeller gel casting forming mould and its manufacture method |
| CN108274610A (en) * | 2018-01-30 | 2018-07-13 | 北京航大新材科技有限公司 | A kind of mold suitable for water base pulp gel injection moulding technique |
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| JP2003039591A (en) * | 2001-08-02 | 2003-02-13 | Nippon Koatsu Concrete Kk | Manufacturing method of resin concrete segment |
| US20050006825A1 (en) * | 2003-07-09 | 2005-01-13 | Kabushiki Kaisha Meidensha | Method of producing molded green body and producing insert by baking the green body |
| CN1824486A (en) * | 2006-03-31 | 2006-08-30 | 哈尔滨工业大学 | Mould for water base pulp gel injection moulding |
| CN102133642A (en) * | 2011-01-20 | 2011-07-27 | 北京科技大学 | Gel centrifugal hard alloy bar forming machine and bar forming preparation method |
| CN102172975A (en) * | 2011-02-18 | 2011-09-07 | 山东合创明业精细陶瓷有限公司 | Mould for preparing ceramic cartridge and method for preparing ceramic cartridge by utilizing same |
| CN104015316A (en) * | 2014-05-09 | 2014-09-03 | 昆山市大久电子有限公司 | Plastic injection mold with rotating ejection demolding function for oblique thread workpieces |
| CN203875290U (en) * | 2014-04-02 | 2014-10-15 | 登封市中岳新能源科技有限公司 | Detachable mold for preparing amorphous alloy pipe |
| CN204725627U (en) * | 2015-06-26 | 2015-10-28 | 汉能新材料科技有限公司 | A kind of gel casting forming prepares the mould of large scale tubulose green compact |
-
2015
- 2015-06-26 CN CN201510359730.5A patent/CN106313276A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003039591A (en) * | 2001-08-02 | 2003-02-13 | Nippon Koatsu Concrete Kk | Manufacturing method of resin concrete segment |
| US20050006825A1 (en) * | 2003-07-09 | 2005-01-13 | Kabushiki Kaisha Meidensha | Method of producing molded green body and producing insert by baking the green body |
| CN1824486A (en) * | 2006-03-31 | 2006-08-30 | 哈尔滨工业大学 | Mould for water base pulp gel injection moulding |
| CN102133642A (en) * | 2011-01-20 | 2011-07-27 | 北京科技大学 | Gel centrifugal hard alloy bar forming machine and bar forming preparation method |
| CN102172975A (en) * | 2011-02-18 | 2011-09-07 | 山东合创明业精细陶瓷有限公司 | Mould for preparing ceramic cartridge and method for preparing ceramic cartridge by utilizing same |
| CN203875290U (en) * | 2014-04-02 | 2014-10-15 | 登封市中岳新能源科技有限公司 | Detachable mold for preparing amorphous alloy pipe |
| CN104015316A (en) * | 2014-05-09 | 2014-09-03 | 昆山市大久电子有限公司 | Plastic injection mold with rotating ejection demolding function for oblique thread workpieces |
| CN204725627U (en) * | 2015-06-26 | 2015-10-28 | 汉能新材料科技有限公司 | A kind of gel casting forming prepares the mould of large scale tubulose green compact |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106994759A (en) * | 2017-04-12 | 2017-08-01 | 北京科技大学 | A kind of ceramic impeller gel casting forming mould and its manufacture method |
| CN108274610A (en) * | 2018-01-30 | 2018-07-13 | 北京航大新材科技有限公司 | A kind of mold suitable for water base pulp gel injection moulding technique |
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Effective date of registration: 20170901 Address after: 100101, No. 14, building 1, 7, 101, 0801, 3, building 8, building No. 2, West Beichen Road, Chaoyang District, Beijing Applicant after: Chinese LIAN mobile energy investment Limited Address before: 100101 Beijing, Beichen West Road, No. 8, Beichen Century Center, block B, floor 10, Applicant before: Hanergy New materials Technology Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20170111 |