CN113788602B - Aspherical glass lens molding method and molding die thereof - Google Patents
Aspherical glass lens molding method and molding die thereof Download PDFInfo
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- CN113788602B CN113788602B CN202111021454.3A CN202111021454A CN113788602B CN 113788602 B CN113788602 B CN 113788602B CN 202111021454 A CN202111021454 A CN 202111021454A CN 113788602 B CN113788602 B CN 113788602B
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- exhaust hole
- glass lens
- blocking part
- core
- aspherical glass
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The application relates to the technical field of molding equipment, and discloses a molding method for an aspherical glass lens. The utility model also discloses an aspherical glass lens mould pressing mould, including last mould benevolence, lower mould benevolence, offer the exhaust hole on the lower mould benevolence, be equipped with the jam part in the exhaust hole, the jam part can take place axial displacement in the exhaust hole, jam part external diameter and the adaptation of exhaust hole internal diameter size, the jam part length is less than or equal to exhaust hole length. The application overturns the traditional exhaust concept, the blocking part prevents the air flow from being discharged rapidly, and the air flow in the die cavity is changed adaptively by controlling the extending and withdrawing actions of the blocking part in the exhaust hole, so as to avoid generating air bubbles on the surface of the lens.
Description
Technical Field
The application relates to the technical field of molding equipment, in particular to an aspherical glass lens molding method and a molding die thereof.
Background
Aspherical glass molding is a technique in which a glass material is heated and softened to a certain extent, and then deformed into an aspherical shape by applying a certain pressure to a molding die having a high precision surface. In the molding process, trace gas is released due to the fact that saturated vapor pressure is increased, and the upper die core and the lower die core of the traditional die are tightly combined with the preformed body, so that gas in the die is retained, and finally, fog is generated on the surface of the lens, uneven marks are easily generated on the surface of the lens, and the surface structure and the surface quality of the lens are seriously affected.
The patent with publication number CN208980569U discloses a mould for moulding aspherical lenses of chalcogenide glass, which considers the problem of gas retention, wherein a fixing plate and a lower fixing plate are both provided with nitrogen-filled air holes, the nitrogen-filled air holes are communicated with a placing hole, an upper plate and a lower plate are guided by guide posts, gas can be directly discharged between the upper plate and the lower plate during mould pressing, the gas cannot be retained in a moulding cavity, although the surface of the lenses can be improved to a certain extent, in this way, the airflow has a definite flow direction, which is equivalent to the enlargement of the air hole volume, the glass can flow to the air hole by hot pressing during mould closing, and finally air bubbles can still be generated on the surface of the lenses.
Disclosure of Invention
The application solves the technical problems of overcoming the defects of the prior art, and provides an aspherical glass lens molding method for solving the problems of poor wafer surface shape and surface quality caused by poor exhaust in the molding process.
The application also provides an aspherical glass lens molding die, which can properly adjust the air flow in the molding process by adjusting the volume of the vent hole of the lower die core, thereby ensuring the molding quality of the lens.
The aim of the application is achieved by the following technical scheme:
the molding process of aspherical glass lens includes molding upper mold core and lower mold core, dredging the airflow during mold closing of the upper mold core and the lower mold core and preventing the airflow from being exhausted.
Further, an exhaust hole is arranged on the lower die core for air flow, and a blocking part capable of moving back and forth along the axial direction of the exhaust hole is arranged in the exhaust hole.
The utility model provides an aspherical glass lens mould pressing mould, includes mould benevolence, lower mould benevolence, offers the exhaust hole on the lower mould benevolence, is equipped with the jam part in the exhaust hole, and the jam part can take place axial displacement in the exhaust hole, and jam part external diameter and the adaptation of exhaust hole internal diameter size, jam part length is less than or equal to exhaust hole length.
Further, the end of the blocking part close to the outlet of the exhaust hole is connected with a connecting piece, the lower die core is provided with a mounting hole, when the blocking part enters the exhaust hole, the connecting piece enters the mounting hole of the lower die core, and the displacement of the blocking part in the exhaust hole is regulated by operating the connecting piece.
Further, the connecting piece is in threaded connection with the lower die core mounting hole.
Still further, the blocking member and the connector are integrally formed.
Further, the diameter of the vent hole is 0.2 mm-0.4 mm.
Further, the length of the vent hole is 4 mm-6 mm.
Further, a ring is installed between the upper die core and the lower die core.
Further, the peripheries of the upper die core and the lower die core are sleeved with a forming sleeve.
Compared with the prior art, the application has the following beneficial effects:
1) The traditional exhaust concept is overturned, the blocking part prevents the air flow from being discharged rapidly, and the air flow in the die cavity is adaptively changed by controlling the extending and extracting actions of the blocking part in the exhaust hole, so that the air bubble is prevented from being generated on the surface of the lens;
2) The mould is creatively designed with the blocking component and the connecting piece which are connected with each other, the connecting piece is preferably screwed with the mounting hole, and the in-out displacement of the blocking component in the exhaust hole can be flexibly adjusted, so that the volume of gas entering the exhaust hole can be orderly adjusted, the requirement of discharging a proper amount of gas during mould pressing is met, and the phenomenon of bubble marks on the surface of a product after mould pressing is eliminated.
Drawings
FIG. 1 is a sectional view showing a constitution of a molding die according to example 1;
FIG. 2 is a schematic view of the structure of the connector and blocking member of FIG. 1;
fig. 3 is a comparison of the quality of lenses molded in example 1, example 2 and example 3.
Detailed Description
The present application will now be described further in connection with the following detailed description, wherein the drawings are for purposes of illustration only and are not intended to be limiting; for the purpose of better illustrating embodiments of the application, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
The method for molding the aspherical glass lens includes such steps as shaping upper and lower mould cores, dredging the airflow while preventing the airflow from being discharged, and arranging a vent hole for airflow.
The molding method is completely opposite to the traditional exhaust concept, the blocking part prevents the air flow from being exhausted rapidly, and the air flow in the mold cavity is changed adaptively by controlling the extending and withdrawing actions of the blocking part in the exhaust hole, so that the air bubble is avoided on the surface of the lens, and the excellent finished product quality of the lens is ensured.
The following provides a mould pressing mould for realizing the mould pressing method, as shown in fig. 1, which comprises an upper mould core 1 and a lower mould core 2, wherein a ring 3 is arranged between the upper mould core and the lower mould core, a mould sleeve 4 is sleeved on the peripheries of the upper mould core and the lower mould core, an exhaust hole 21 is formed in the lower mould core 2, the exhaust hole is specifically formed at the bottom of a mould closing position, a blocking part 51 is arranged in the exhaust hole 21, the blocking part can automatically or manually axially displace in the exhaust hole, the outer diameter of the blocking part 51 is matched with the inner diameter of the exhaust hole 21, and the length of the blocking part 51 is smaller than or equal to that of the exhaust hole 21.
As shown in fig. 2, the end of the blocking member 51 near the outlet of the vent hole 21 is connected to a connecting member 52, which is an operation medium, the lower die core 2 is provided with the mounting hole 22, the blocking member 51 is synchronously introduced into the vent hole 21 from the mounting hole 22 by placing the connecting member 52 into the mounting hole 22, and the displacement of the blocking member 51 in the vent hole is regulated by operating the connecting member 52.
In order to flexibly adjust the displacement of the blocking component in the exhaust hole, so as to adaptively adjust the gas volume in the exhaust hole, the connecting piece 52 is preferably in threaded connection with the lower die core mounting hole 22, and the connecting piece is of a screw structure at the moment, and further preferably, the blocking component 51 and the connecting piece 52 are integrally formed, so that the position degree of the blocking component and the connecting piece is fully ensured, and the problems of breakage, clamping stagnation and the like of the blocking component in the screwing-in and screwing-out process of the connecting piece are avoided.
In the embodiment, the diameter of the vent hole is 0.2 mm-0.4 mm, and the length of the vent hole is 4 mm-6 mm.
According to the mold pressing mold, the length of the blocking part entering the exhaust hole is controlled through the screwing amount of the connecting piece in the lower mold core mounting hole, when the blocking part enters the exhaust hole for a long time, part of gas which is discharged and accumulated in the exhaust hole during original mold closing can be overflowed into the mold cavity again, the phenomenon that glass flows to the exhaust hole in the mold closing process is reduced, and the risk of bubbles on the surface of a lens is reduced; when the entering length of the blocking part is short, a part of gas in the die cavity can enter the vent hole again, so that the influence on the molding of the lens is avoided. The adjustable setting of the blocking component is used for adjusting the proper volume of the die clamping gas, so that the effects of storing gas, exhausting gas and not generating bubble marks on the surface of the lens are achieved.
The diameter of the connecting piece is different along with the size of the lens, the diameter and the length of the connecting piece are also different, and in the embodiment, the diameter of the connecting piece is about 6mm, and the length of the connecting piece is about 20mm (the length at least needs to be used for connecting the outlet of the vent hole with the bottom of the lower die core).
The preform glass ball having a diameter of 7.85. 7.85 mm was molded into a preform glass ball having a specification by using the molding die of the present embodimentThe process flow of the lens product of (a): feeding, pellet preheating, high-temperature die pressing, product cooling and discharging, and the specific implementation steps are as follows:
1. and (3) feeding: taking out the upper die core, the ring and the die sleeve by using a mechanical arm in a full-automatic mode, placing a preformed body, namely a glass ball, in the lower die core, then slightly placing the ring and the upper die core back into the die sleeve until the glass ball and the upper die core are just touched together, and finally placing the whole die on a feeding table;
2. preheating: heating the mold and the glass ball integrally in the preheating shaft so as to slowly heat the glass ball to soften;
3. high-temperature mould pressing: the upper heating plate of the forming shaft is used for pressing the upper die core and the lower die core, applying pressure to the preformed glass ball, stopping moving when the pressure reaches a set value, and performing pressure maintaining operation on the glass ball;
4. and (3) cooling: cooling the upper die core and the lower die core in the cooling shaft to reach a set temperature;
5. and (3) blanking: and taking out the mould at the discharge hole by using a manipulator in a full-automatic mode, separating the upper mould from the lower mould, taking out a glass mould pressing finished product by using a vacuum adsorption means, and placing the glass mould pressing finished product in a finished product box.
FIG. 3 shows the morphology of a finished lens molded with three different compression molds, the first image being the mold without vent holes, as can be seen, the lens surface being hazed; the second figure shows that the mold is provided with a vent hole, the volume of gas in the vent hole is not regulated, and the observation shows that the surface of the lens is improved in terms of fogging compared with the first figure, but bubbles are generated on the surface of the lens; the third figure shows a lens molded by the mold of the present application, the surface appearance is greatly improved, and the fog and bubble phenomena are all eliminated.
The mould pressing mould has the advantages of simple design, adjustable process and simple processing, and has the advantages of obviously reducing the surface shape reject ratio of lens production and ensuring excellent forming effect.
It is apparent that the above examples are only examples for clearly illustrating the technical solution of the present application, and are not limiting of the embodiments of the present application. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are desired to be protected by the following claims.
Claims (8)
1. The molding process of aspherical glass lens includes molding upper mold core and lower mold core, and features that the lower mold core has exhaust holes for airflow to flow through and inside blocking part capable of moving back and forth along the axial direction of the exhaust holes to dredge the airflow and prevent the airflow from being exhausted; by controlling the extending and withdrawing actions of the blocking part in the exhaust hole, the airflow in the die cavity is adaptively changed.
2. The aspherical glass lens mould pressing mould comprises an upper mould core and a lower mould core and is characterized in that the lower mould core is provided with an exhaust hole, a blocking part is arranged in the exhaust hole and can axially displace in the exhaust hole, the outer diameter of the blocking part is matched with the inner diameter of the exhaust hole in size, and the length of the blocking part is smaller than or equal to the length of the exhaust hole;
the end of the blocking part close to the outlet of the exhaust hole is connected with a connecting piece, the lower die core is provided with a mounting hole, when the blocking part enters the exhaust hole, the connecting piece enters the mounting hole of the lower die core, and the displacement of the blocking part in the exhaust hole is regulated by operating the connecting piece.
3. The aspherical glass lens pressing mold according to claim 2, wherein the connecting member is screw-coupled with the lower mold insert mounting hole.
4. An aspherical glass lens pressing mold according to claim 2 or 3, wherein the blocking member and the connecting member are integrally formed.
5. The aspherical glass lens molding die of claim 2, wherein the diameter of the vent hole is 0.2mm to 0.4mm.
6. The aspherical glass lens molding die of claim 2, wherein the vent hole has a length of 4mm to 6mm.
7. The aspherical glass lens molding die of claim 2, wherein a ring is installed between the upper mold core and the lower mold core.
8. The aspherical glass lens molding die of claim 7, wherein the upper and lower mold cores are peripherally sleeved with a molding sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021454.3A CN113788602B (en) | 2021-09-01 | 2021-09-01 | Aspherical glass lens molding method and molding die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021454.3A CN113788602B (en) | 2021-09-01 | 2021-09-01 | Aspherical glass lens molding method and molding die thereof |
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| Publication Number | Publication Date |
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| CN113788602A CN113788602A (en) | 2021-12-14 |
| CN113788602B true CN113788602B (en) | 2023-09-15 |
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| CN202111021454.3A Active CN113788602B (en) | 2021-09-01 | 2021-09-01 | Aspherical glass lens molding method and molding die thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114230156B (en) * | 2021-12-30 | 2024-02-09 | 安徽光智科技有限公司 | Aspherical lens mould |
| CN114772905B (en) * | 2022-04-29 | 2023-09-01 | 安徽光智科技有限公司 | Method for adjusting surface type of aspherical precision mould pressing lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06305746A (en) * | 1993-04-22 | 1994-11-01 | Sumitomo Heavy Ind Ltd | Mold for forming optical glass lens |
| JP3659437B2 (en) * | 1996-06-06 | 2005-06-15 | 日本電気硝子株式会社 | Lower mold for glass molding |
| JP3489055B2 (en) * | 2000-11-01 | 2004-01-19 | 日本航空電子工業株式会社 | Degassing structure for injection mold |
| US8973405B2 (en) * | 2010-06-17 | 2015-03-10 | Johns Manville | Apparatus, systems and methods for reducing foaming downstream of a submerged combustion melter producing molten glass |
| CN209210633U (en) * | 2018-12-24 | 2019-08-06 | 成都光明光学元件有限公司 | The casted die mould of non-spherical lens |
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