CN110713389B - Method for forming non-spherical ceramic mold core - Google Patents
Method for forming non-spherical ceramic mold core Download PDFInfo
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- CN110713389B CN110713389B CN201911197840.0A CN201911197840A CN110713389B CN 110713389 B CN110713389 B CN 110713389B CN 201911197840 A CN201911197840 A CN 201911197840A CN 110713389 B CN110713389 B CN 110713389B
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- mold core
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- ceramic powder
- ceramic mold
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
- C04B35/645—Pressure sintering
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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
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/04—Discharging the shaped articles
- B28B13/06—Removing the shaped articles from moulds
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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
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
-
- 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
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
- B28B3/2654—Means for heating or cooling the die
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/02—Press-mould materials
- C03B2215/05—Press-mould die materials
- C03B2215/07—Ceramic or cermets
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
A molding method of an aspherical ceramic mold core comprises the following steps: step one, material discharging: putting ceramic powder into a molding cavity of the molding jig; step two, vacuumizing treatment: vacuumizing the interior of the sintering furnace; step three, sintering process: applying pressure on the ceramic powder in the forming cavity by adopting a tungsten pressing block, and simultaneously heating the ceramic powder to form a ceramic mold core by the ceramic powder; step four, unloading: decompressing the interior of the sintering furnace, removing the tungsten pressing block, cooling the ceramic mold core at the same time, and finally taking out the ceramic mold core from the molding cavity; wherein, the aspheric surface part of the tungsten briquetting is plated with a diamond-like carbon film layer. The forming method can directly form the non-spherical surface of the ceramic mold core, and the non-spherical surface is not required to be processed by processes such as turning and milling, so that the production efficiency of the ceramic mold core is greatly improved, the use cost of a cutter is saved, and the production cost of the ceramic mold core is reduced.
Description
Technical Field
The present invention relates to a method for molding a mold core, and more particularly, to a method for molding an aspherical ceramic mold core.
Background
At present, an aspheric lens is generally formed by die casting using a forming mold, and in order to form an aspheric lens, an aspheric surface needs to be formed on a mold surface of the mold. For glass lenses, because the glass lenses are formed at a higher temperature, the mold core is usually formed of a tungsten steel material having a higher melting point.
However, the hardness of the tungsten steel material is too high, so that the aspheric surface is difficult to process after the mold core is molded. At present, the surface of the die core is cut by using a diamond cutter, but the efficiency is lower, the loss is larger, and the manufacturing cost of the die core is increased.
Disclosure of Invention
In order to solve the above problems, a technical solution of the present invention is to provide a method for molding an aspherical ceramic mold insert, including the steps of:
step one, material discharging: putting ceramic powder into a molding cavity of the molding jig;
step two, vacuumizing treatment: vacuumizing the interior of the sintering furnace;
step three, sintering process: applying pressure on the ceramic powder in the forming cavity by adopting a tungsten pressing block, and simultaneously heating the ceramic powder to form a ceramic mold core by the ceramic powder;
step four, unloading: decompressing the interior of the sintering furnace, removing the tungsten pressing block, cooling the ceramic mold core at the same time, and finally taking out the ceramic mold core from the molding cavity;
the aspheric surface part of the tungsten pressing block is plated with a diamond-like carbon film layer or a graphite layer.
Further, in the third step, the pressure generated by the pressure applied to the ceramic powder is increased in a stepwise manner.
Further, in the third step, a pressure of 30mPa was applied to the ceramic powder in the first stage for 20min, a pressure of 60mPa was applied to the ceramic powder in the second stage for 80 min.
Further, in the third step, the temperature of heating the ceramic powder is gradually increased.
Further, in the third step, the highest heating temperature is 1600-1800 ℃.
Further, the total thickness of the diamond-like film layer or the graphite layer is less than 1 μm.
Further, in the first step, the semi-finished product of the ceramic mold core is placed in a molding cavity of the molding jig, and then ceramic powder is placed in the molding cavity.
After the technical scheme is adopted, the invention has the effects that: by adopting the forming method of the non-spherical ceramic mold core, the non-spherical surface of the ceramic mold core can be directly formed, processes such as turning and milling are not needed to process the non-spherical surface, the production efficiency of the ceramic mold core is greatly improved, the use cost of a cutter is saved, and the production cost of the ceramic mold core is reduced.
Drawings
FIG. 1 is an internal cross-sectional view of a sintering furnace according to the present invention;
FIG. 2 is a flow chart of a molding method according to the present invention;
FIG. 3 is a schematic view of a mold core according to the present invention.
Detailed Description
It is specifically noted that the terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative positional relationship between the components, the movement, and the like in a certain posture, and if the certain posture is changed, the directional indicator is changed accordingly.
The technical solution of the present invention is further described by the following examples:
the invention provides a molding method of an aspheric ceramic mold core, which is carried out in a sintering furnace, as shown in figure 1, the sintering furnace is provided with a molding jig 1 and a tungsten pressing block 2, the molding jig 1 is provided with a molding cavity 10, and the tungsten pressing block 2 is provided with an aspheric part 20; as shown in fig. 2, the molding method includes the steps of:
step one (S101), discharging: ceramic powder is put into a forming cavity 10 of the forming jig 1;
step two (S102), evacuation processing: vacuumizing the interior of the sintering furnace;
step three (S103), performing a sintering process: applying pressure on the ceramic powder in the forming chamber 10 by using the tungsten pressing block 2, and heating the ceramic powder at the same time to form a ceramic mold core 3 by using the ceramic powder;
step four (S104), unloading: and (3) decompressing the interior of the sintering furnace, removing the tungsten pressing block 2, cooling the ceramic die core 3, and finally taking out the product from the forming cavity 10.
Wherein, the aspheric surface part 20 of the tungsten briquetting 2 is plated with a diamond-like carbon film layer (namely, a D L C layer) or a graphite layer.
As shown in fig. 3, the molded ceramic mold core 3 has a positioning section 31 and a joining section 32, and the upper end surface of the joining section 32 has an aspheric surface 33. The aspheric surface 33 of the ceramic mold core 3 can be directly formed by the method without finish machining such as turning and milling, on one hand, the production efficiency of the ceramic mold core 3 can be greatly improved, and on the other hand, the production cost of the ceramic mold core 3 can be reduced. In addition, because the aspheric surface part 20 of the tungsten press block 2 is plated with the diamond-like carbon film layer or the graphite layer, the tungsten press block 2 and the ceramic mold core 3 are not bonded due to overhigh temperature, and the tungsten press block and the ceramic mold core are easier to separate. In addition, graphite has better heat-conducting property, can make the heat transfer to ceramic powder more fast in, improves production efficiency.
Specifically, in step three, the pressure generated by the pressure applied to the ceramic powder is increased in a stepwise manner. Compared with the method of directly applying high pressure, the step-type rising pressure can enable the bonding process of the ceramic powder to be smoother, the bonding degree to be higher and the sintering effect to be better.
More specifically, in step three, a pressure of 30mPa is applied to the ceramic powder in the first stage for 20min, a pressure of 60mPa is applied to the ceramic powder in the second stage for 80 min. Through testing, after the pressure of 30mPa is applied in the first stage, the ceramic powder can fully fill the inner space of the forming chamber 10; after applying a pressure of 60mPa in the second stage, a strong bond between the ceramic powders can be formed.
Specifically, in step three, the temperature at which the ceramic powder is heated is gradually increased. Compare with direct conduction high temperature, the heating temperature who increases gradually can make ceramic powder be heated more evenly, and the holistic shaping effect of ceramic mould benevolence 3 is better.
More specifically, in the third step, the highest temperature of heating is 1500-2000 ℃. The highest temperature reaches 60-80% of the melting point of the ceramic, so that the ceramic can be rapidly sintered.
More specifically, the total thickness of the diamond-like film layer or graphite layer is less than 1 μm. Therefore, the tungsten pressing block 2 can be ensured to have better heat-conducting property, and the sintering efficiency is improved.
As a modification, the molding method may not form the entire ceramic mold core, but a portion of the ceramic mold core is manufactured by die casting, and then the portion of the ceramic mold core with the aspheric surface 33 is formed by the molding method. Such as: the positioning section 31 is manufactured by die casting, and the joint section 32 is formed by the above-mentioned forming method.
Specifically, in the first step, the semi-finished product of the ceramic mold core is placed in the molding cavity 10 of the molding jig 1, and then the ceramic powder is placed in the molding cavity 10. Because the time consumed by the sintering process is longer than that consumed by die casting, the method can further improve the production efficiency of the ceramic die core.
Therefore, by adopting the forming method of the non-spherical ceramic mold core, the non-spherical surface of the ceramic mold core can be directly formed, processes such as turning and milling are not needed to process the non-spherical surface, the production efficiency of the ceramic mold core is greatly improved, the use cost of a cutter is saved, and the production cost of the ceramic mold core is reduced.
The above-described embodiments are merely preferred examples of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles of the invention described in the claims should be included in the claims.
Claims (7)
1. A method for molding an aspherical ceramic mold core is characterized in that: the molding method comprises the following steps:
step one, material discharging: putting ceramic powder into a molding cavity of the molding jig;
step two, vacuumizing treatment: vacuumizing the interior of the sintering furnace;
step three, sintering process: applying pressure on the ceramic powder in the forming cavity by adopting a tungsten pressing block, and simultaneously heating the ceramic powder to form a ceramic mold core by the ceramic powder;
step four, unloading: decompressing the interior of the sintering furnace, removing the tungsten pressing block, cooling the ceramic mold core at the same time, and finally taking out the ceramic mold core from the molding cavity;
the aspheric surface part of the tungsten pressing block is plated with a diamond-like carbon film layer or a graphite layer.
2. The method of claim 1, wherein the molding process comprises: in the third step, the pressure generated by the pressure applied to the ceramic powder is increased in a stepwise manner.
3. The method of claim 2, wherein the molding process comprises: in the third step, the pressure of 30MPa is applied to the ceramic powder in the first stage, the first stage lasts for 20min, the pressure of 60MPa is applied to the ceramic powder in the second stage, and the second stage lasts for 80 min.
4. The method of claim 1, wherein the molding process comprises: in the third step, the temperature for heating the ceramic powder is gradually increased.
5. The method of claim 4, wherein the molding process comprises: in the third step, the highest heating temperature is 1600-1800 ℃.
6. The method of claim 1, wherein the molding process comprises: the total thickness of the diamond-like film layer or the graphite layer is less than 1 μm.
7. The method of claim 1, wherein the molding process comprises: in the first step, the semi-finished product of the ceramic mold core is placed in a molding cavity of the molding jig, and then ceramic powder is placed in the molding cavity.
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| CN201911197840.0A CN110713389B (en) | 2019-11-29 | 2019-11-29 | Method for forming non-spherical ceramic mold core |
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| CN201911197840.0A CN110713389B (en) | 2019-11-29 | 2019-11-29 | Method for forming non-spherical ceramic mold core |
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| CN110713389B true CN110713389B (en) | 2020-07-14 |
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| CN1830851A (en) * | 2005-03-09 | 2006-09-13 | 鸿富锦精密工业（深圳）有限公司 | Mould core of molding glass lens |
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| CN102139465B (en) * | 2010-09-16 | 2012-11-07 | 湖南大学 | High-efficiency ultra-precision machining method for parts with aspheric curved surfaces and high-efficiency ultra-precision machining device therefor |
| CN203527805U (en) * | 2013-11-07 | 2014-04-09 | 中山联合光电科技有限公司 | Plastic optical lens mold structure |
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- 2019-11-29 CN CN201911197840.0A patent/CN110713389B/en active Active
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| CN1830851A (en) * | 2005-03-09 | 2006-09-13 | 鸿富锦精密工业（深圳）有限公司 | Mould core of molding glass lens |
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| CN104193422A (en) * | 2014-09-05 | 2014-12-10 | 中国科学院上海硅酸盐研究所 | Silicon carbide ceramic mold core for glass modeling and preparation method thereof |
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| KR101862322B1 (en) * | 2016-09-26 | 2018-05-29 | 한국생산기술연구원 | polishing apparatus for mold core of micro aspherical lens array |
| CN107298524A (en) * | 2017-06-08 | 2017-10-27 | 深圳市天阳谷科技发展有限公司 | A kind of major diameter non-spherical lens preparation method |
| CN207435297U (en) * | 2017-06-08 | 2018-06-01 | 深圳市天阳谷科技发展有限公司 | A kind of major diameter non-spherical lens molding mode |
| CN110078496A (en) * | 2018-01-25 | 2019-08-02 | 国家电投集团科学技术研究院有限公司 | The preparation method and preparation facilities of ceramic material |
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