Production equipment for microlens glass mold and use method thereof

Abstract

The present invention relates to a production device for a microlens glass mold and a method for its use, belonging to the technical field of optical mold preparation. The present invention utilizes a specially prepared titanium alloy material to manufacture the glass mold production device, improving its thermal conductivity uniformity, thereby initially enhancing the mold's demolding performance. Subsequently, by providing a special demolding layer and air inlet ducts, the demolding device achieves physical demolding through the demolding layer and in-situ reaction between the demolding layer and the air intake to produce gas expansion, significantly improving the demolding performance of the production device and promising broad application prospects.

Description

Technical Field

[0001] The present invention relates to a production device for a microlens glass mold and a use method thereof, belonging to the technical field of optical mold preparation. Background Art

[0002] At present, multi-point defocus lenses are divided into two materials, one is PC material and the other is light-cured resin material. The preparation molds of these two kinds of defocus lenses are both steel molds. Steel molds are expensive, and for resin lenses with a long production cycle, a large number of molds are required. Steel molds are not very convenient, which sharply increases production costs. Glass molds are low in cost and can be used to prepare defocus lenses with different refractive indices, which is convenient for subsequent processing.

[0003] In view of the above-mentioned drawbacks, the present invention aims to create a production device for a microlens glass mold and a method for using the same, so as to make it more valuable for industrial use. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a production device for a microlens glass mold and a method for using the same.

[0005] The present invention provides a production device for a microlens glass mold, comprising a titanium alloy upper mold and a titanium alloy lower mold, which are matched and arranged to form a glass blank accommodating cavity for placing a glass blank to be rolled into a lens mold. A plurality of electric heating devices are inserted into the titanium alloy upper mold and the titanium alloy lower mold base for heating the titanium alloy upper mold and the titanium alloy lower mold so that the glass blank in the glass blank accommodating cavity is softened by heat and rolled into a required shape. The arc-shaped inner surface of the titanium alloy upper mold is evenly provided with multiple circles of concentric circular protruding micro-dot structures, each of the micro-dot structures includes a convex lens structure located at the center of the circle and multiple circles of concentric serrated edge structures located on the periphery of the convex lens structure. The side wall of the titanium alloy upper mold is also provided with an air inlet channel tangent to its arc-shaped inner surface for introducing gas into the demolding surface for facilitating demolding.

[0006] Furthermore, the inner surfaces of the titanium alloy upper mold and the titanium alloy lower mold are both provided with a glass body release agent layer, and the glass body release agent layer comprises the following raw materials in parts by weight:

[0007] 40-50 parts by mass of 50% aluminum hydrogen phosphate solution;

[0008] 8-10 parts of colloidal graphite powder with a particle size of less than 1.5 μm;

[0009] 2-5 parts of barium fluoride;

[0010] 0.2-0.5 parts of ethylene glycol butyl ether;

[0011] 0.2-0.5 parts of ethylene glycol butyl ether;

[0012] 20-25 parts of distilled water.

[0013] Furthermore, the forming process of the glass body release agent layer is:

[0014] After the raw materials of the glass body release agent layer are prepared into a coating, the coating is sprayed on the mold surface with a spray gun to form a uniform coating, which reaches 100-150 μm after air drying and hardening; then the coating is placed in an electric oven for heat treatment, first at 60-70° C. for 2 minutes, then heated to 110-120° C. for 20 minutes, and then heated to 300-350° C. for 1 hour.

[0015] Furthermore, the titanium alloy upper mold and the titanium alloy lower mold are both made of a titanium alloy material with uniform heat transfer; the preparation method of the titanium alloy material with uniform heat transfer is as follows:

[0016] (1) Apricot shell carbon and silicon dioxide are mixed and ground in a mass ratio of 3:1 to obtain a mixture, the mixture is placed in a graphite crucible, and the graphite crucible is pushed into a tubular sintering furnace, heated to 1400°C under an argon atmosphere, and after high-temperature reaction for 2 to 3 hours, the temperature is lowered to 600°C, the power supply and gas source are turned off, and the reaction product is taken out after cooling with the furnace, and finally decarbonized at 700°C for 2 hours to obtain silicon carbide nanowires;

[0017] (2) A 6 g / L aluminum nitrate solution was prepared and placed in a sealable container. Isopropyl alcohol was added and the silicon carbide nanowires were immersed in the aluminum nitrate solution. After nitrogen was introduced for 15 minutes, the container was quickly sealed and the sealed container was irradiated with gamma rays at room temperature. The irradiation dose was 70 KGy and the dose rate was 70 Gy / min. After the irradiation reaction was completed, the silicon carbide nanowires were taken out and dried to obtain a self-made thermal conductive filler.

[0018] (3) By weight, 4.5-5.0 parts of Al, 2.0-2.5 parts of Fe, 1.5-2.0 parts of Si, 0.5-0.8 parts of Mn, 0.1-0.3 parts of Sn, 0.05-0.10 parts of Ga, 6.0-6.5 parts of self-made thermal conductive filler and 60-70 parts of Ti are heated to 690-750°C, melted by ultrasonic oscillation at a frequency of 35-45 kHz, and injection molded to obtain a titanium alloy material with uniform heat transfer.

[0019] A method for using a production device for a microlens glass mold, wherein the specific steps are as follows:

[0020] (1) Under an argon atmosphere, the polished glass blank is placed in a glass blank accommodating cavity formed between a titanium alloy upper mold and a titanium alloy lower mold. The power is turned on to heat the titanium alloy upper mold and the titanium alloy lower mold to 650-700°C through an electric heating device to reach the softening point of the glass blank. Then, a pressure of 1.0-2.0 MPa is applied to the titanium alloy upper mold and the titanium alloy lower mold to close the titanium alloy upper mold and the softened glass blank is rolled to form the desired surface shape on the surface of the glass blank.

[0021] (2) Before opening the mold, oxygen is introduced into the glass blank cavity through the air inlet channel at a rate of 10 mL / min. The ventilation is continued for 20 to 30 minutes and then stopped. After naturally cooling to room temperature, the titanium alloy upper mold and the titanium alloy lower mold are opened and the finished glass mold is taken out.

[0022] By means of the above solution, the present invention has at least the following advantages:

[0023] (1) The micro-dot structure of the present invention is composed of many tiny concentric circular pattern sheets. Each ring is actually a different prism. It is precisely because of these patterns that the overall thickness of the lens is reduced. Therefore, the lens designed with this defocus lens allows a significant reduction in lens thickness, weight and volume. In addition, the multi-circle pattern design increases the surface area of ​​the glass blank release agent, which increases the probability of in-situ gas expansion demoulding and improves the demoulding effect of the mold;

[0024] (2) In the glass body release agent layer of the present invention, aluminum hydrogen phosphate is an inorganic binder with high stability under high temperature conditions. During the heating process, free water disappears first, aluminum metaphosphate undergoes polymerization, and aluminum metal cations form a network structure in the middle of each metaphosphate chain, thereby generating high-temperature bonding properties, so that the graphite solid lubricant release agent can adhere to the mold surface and promote glass demolding; colloidal graphite powder is a solid lubricant with good processability, thermal stability, plasticity, acid resistance, chemical stability of organic solvents, and excellent thermal conductivity. The properties of barium fluoride are beneficial to the heat transfer on the mold surface, so that the contact surface between the glass blank and the mold is evenly heated, which is convenient for the subsequent softening, molding and demolding of the glass blank. Barium fluoride has excellent wear resistance and oxidation resistance. Adding barium fluoride to the release agent can improve the oxidation resistance of the mold, increase the service life of the mold, and prevent the deformation of the mold surface from affecting the accuracy of the final glass mold product. Ethylene glycol butyl ether, as a surfactant, is beneficial to the wetting, dispersion and suspension of powders such as graphite in the binder, and is also beneficial to the wet adhesion of the coating to the mold surface, thereby enhancing the final demolding effect. The glass blank release agent layer of the present invention has not only its own lubricating and demolding function, but also, because the graphite powder is a carbon-based raw material, it will react with the oxygen introduced into the subsequent air inlet channel and high temperature conditions to generate gaseous carbon dioxide. The generated gaseous carbon dioxide exists as a gas medium between the mold and the glass blank, plays a gas expansion demolding role, and improves the mold demolding effect. Since the generated carbon dioxide is generated in situ, the gas medium generated between the mold and the glass blank can be made more uniform, which is better than directly introducing carbon dioxide from the air inlet channel for demolding.

[0025] (3) Silicon carbide nanowires are added to the carbon alloy material for uniform heat transfer in the preparation of the titanium alloy upper mold and the titanium alloy lower mold. The silicon carbide nanowire material is an artificial covalent bond compound with excellent high-temperature strength, high thermal conductivity, and a large aspect ratio. It is added to the titanium alloy matrix and combined with ultrasonic oscillation melting to form a disordered distribution and form a heat transfer network, thereby improving the heat transfer uniformity of the mold and improving the softening and demolding effect of the glass mold. The present invention places the silicon carbide nanowires in a mixed solution of metal salts and free radical scavengers, and uses environmentally friendly, efficient and easy-to-control gamma irradiation to reduce the metal ions into metal elements in one step, and deposit them on the surface of the silicon carbide nanowires to form a self-made thermal conductive filler with an aluminum metal layer on the surface. The aluminum layer on its surface is used to improve its compatibility with the titanium alloy substrate when it is melted, so that it can be more evenly dispersed in the aluminum alloy matrix, thereby improving the heat transfer of the mold matrix and further improving the rolling forming and demolding effects of the glass blank.

[0026] (4) The entire process of placing the glass blank into the glass blank receiving cavity in the production equipment of the present invention is carried out in an oxygen-free argon atmosphere. In this environment, the glass blank release agent coated on the surface of the titanium alloy upper mold and the titanium alloy lower mold will not burn, and can prevent the surface oxidation of the upper and lower molds. After the molds are closed and heated, oxygen is introduced into the glass blank receiving cavity through the air inlet channel. On the one hand, the oxygen introduced is introduced from a position tangent to the arc-shaped inner surface of the titanium alloy upper mold, so it can directly act between the inner surface of the mold and the glass blank, and directly contact with the glass blank release agent. Since the glass blank release agent contains graphite, it will react in situ to produce a carbon dioxide release layer under the action of high temperature and oxygen, and produce an excellent demolding effect through in-situ gas expansion.

[0027] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of the production equipment of the microlens glass mold of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the combined state of the production equipment of the microlens glass mold of the present invention;

[0031] Figure 3 This is a schematic structural diagram of a titanium alloy upper mold in the production equipment for the microlens glass mold of the present invention;

[0032] Figure 4 This is a schematic diagram of the bottom-up structure of the titanium alloy upper mold in the production equipment of the microlens glass mold of the present invention;

[0033] Figure 5 It is an enlarged cross-sectional view of the micro-dot structure in the production equipment of the microlens glass mold of the present invention.

[0034] Among them, in the figure;

[0035] 1. Titanium alloy upper mold; 2. Titanium alloy lower mold; 3. Electric heating device; 4. Glass body accommodating cavity;

[0036] 11. Micro-dot structure; 12. Air intake duct;

[0037] 111. Convex lens structure; 112. Sawtooth edge structure. DETAILED DESCRIPTION

[0038] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0039] See also Figures 1 to 5 , a preferred embodiment of the present invention, a production device for a microlens glass mold, includes a titanium alloy upper mold 1 and a titanium alloy lower mold 2, the titanium alloy upper mold 1 and the titanium alloy lower mold 2 being matched and arranged to form a glass blank accommodating cavity 4 for placing a glass blank to be rolled into a lens mold, a plurality of electric heating devices 3 are inserted into the base of the titanium alloy upper mold 1 and the titanium alloy lower mold 2, for heating the titanium alloy upper mold 1 and the titanium alloy lower mold 2, so that the glass blank in the glass blank accommodating cavity 4 is softened by heat and rolled into a desired shape, the arc-shaped inner surface of the titanium alloy upper mold 1 is uniformly provided with multiple circles of concentric circular protruding micro-dot structures 11, each of the micro-dot structures 11 includes a convex lens structure 111 located at the center of the circle and multiple circles of concentric serrated edge structures 112 located on the periphery of the convex lens structure 111, and the side wall of the titanium alloy upper mold 1 is also provided with an air inlet channel 12 arranged tangentially to its arc-shaped inner surface, for introducing gas into the demolding surface to facilitate demolding.

[0040] The micro-dot structure 11 described in the present invention is composed of many tiny concentric circular pattern sheet structures, and each ring is actually a different prism. It is precisely because of these patterns that the overall thickness of the lens is reduced. Therefore, the lens designed with this defocus lens allows a significant reduction in lens thickness, weight and volume. In addition, the multi-circle pattern design increases the area of ​​the surface coated with the glass blank release agent, which increases the probability of in-situ gas expansion demolding and improves the demolding effect of the mold.

[0041] The inner surfaces of the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are both provided with a glass body release agent layer, and the glass body release agent layer comprises the following raw materials in parts by weight:

[0042] 40-50 parts by mass of 50% aluminum hydrogen phosphate solution;

[0043] Aluminum hydrogen phosphate is an inorganic binder with high stability at high temperatures. During the heating process, free water disappears first, aluminum metaphosphate polymerizes, and aluminum metal cations form a network structure between each metaphosphate chain, thus generating high-temperature bonding properties. This allows the graphite solid lubricant release agent to adhere to the mold surface and promote glass demolding.

[0044] 8-10 parts of colloidal graphite powder with a particle size of less than 1.5 μm;

[0045] Colloidal graphite powder is a solid lubricant with good processability, thermal stability, plasticity, acid resistance, and chemical stability to organic solvents. It also has excellent thermal conductivity, which is beneficial to the heat transfer on the mold surface, so that the contact surface between the glass body and the mold is heated evenly, which facilitates the softening, molding, and demolding of the glass body in the later stage.

[0046] 2-5 parts of barium fluoride;

[0047] Barium fluoride has excellent anti-wear and anti-oxidation properties. Adding barium fluoride to the release agent can improve the anti-oxidation performance of the mold, increase the service life of the mold, and prevent the deformation of the mold surface from affecting the accuracy of the final glass mold product;

[0048] 0.2-0.5 parts of ethylene glycol butyl ether;

[0049] As a surfactant, ethylene glycol butyl ether is beneficial to the wetting, dispersion and suspension of graphite and other powders in the binder, and is also beneficial to the wet adhesion of the coating to the mold surface, thereby enhancing the final demoulding effect.

[0050] 20-25 parts of distilled water.

[0051] The forming process of the glass body release agent layer is:

[0052] After the glass body release agent is prepared into a coating, it is sprayed on the mold surface with a spray gun to form a uniform coating, which reaches 100-150 μm after air drying and hardening; then it is placed in an electric oven for heat treatment, first keeping it at 60-70°C for 2 minutes, then heating it to 110-120°C for 20 minutes, and then heating it to 300-350°C for 1 hour.

[0053] In addition to its own lubricating and demolding function, the glass blank release agent layer of the present invention, as a carbon-based raw material, will react with the oxygen introduced into the subsequent air inlet duct 12 and high temperature conditions to generate gaseous carbon dioxide. The generated gaseous carbon dioxide exists as a gas medium between the mold and the glass blank, plays a gas expansion demolding role, and improves the mold demolding effect. Since the generated carbon dioxide is generated in situ, the gas medium generated between the mold and the glass blank can be made more uniform, which is better than directly introducing carbon dioxide from the air inlet duct for demolding.

[0054] The titanium alloy upper die 1 and the titanium alloy lower die 2 are both made of titanium alloy material with uniform heat conduction;

[0055] The preparation method of the titanium alloy material with uniform heat transfer is as follows:

[0056] (1) Apricot shell carbon and silicon dioxide are mixed and ground in a mass ratio of 3:1 to obtain a mixture, the mixture is placed in a graphite crucible, and the graphite crucible is pushed into a tubular sintering furnace, heated to 1400°C under an argon atmosphere, and after high-temperature reaction for 2 to 3 hours, the temperature is lowered to 600°C, the power supply and gas source are turned off, and the furnace is cooled, and the reaction product is taken out, and finally the carbon is removed at a high temperature of 700°C for 2 hours to obtain silicon carbide nanowires; silicon carbide nanowires are prepared by a carbon thermal reduction method using apricot shell carbon as a carbon source and silicon dioxide as a silicon source;

[0057] (2) A 6 g / L aluminum nitrate solution is prepared and placed in a sealable container, and isopropyl alcohol is added at the same time. Then, the above-mentioned silicon carbide nanowires are immersed in the aluminum nitrate solution, and nitrogen is introduced for aeration for 15 minutes. The container is quickly sealed and the sealed container is subjected to γ-ray irradiation at room temperature. The irradiation dose is 70 KGy and the dose rate is 70 Gy / min. After the irradiation reaction is completed, the silicon carbide nanowires are taken out and dried to obtain a self-made thermal conductive filler. The present invention places the silicon carbide nanowires in a mixed solution of a metal salt and a free radical scavenger, and uses environmentally friendly, efficient and easy-to-control γ irradiation to reduce the metal ions into a metal element in one step, and deposits them on the surface of the silicon carbide nanowires to form a self-made thermal conductive filler with an aluminum metal layer on the surface. The aluminum layer on its surface is used to improve its compatibility with the titanium alloy substrate when it is melted, so that it can be more evenly dispersed in the aluminum alloy matrix, thereby improving the heat transfer of the mold matrix and thereby improving the rolling forming and demolding effects of the glass blank.

[0058] (3) By weight, 4.5-5.0 parts of Al, 2.0-2.5 parts of Fe, 1.5-2.0 parts of Si, 0.5-0.8 parts of Mn, 0.1-0.3 parts of Sn, 0.05-0.10 parts of Ga, 6.0-6.5 parts of self-made thermal conductive filler and 60-70 parts of Ti are heated to 690-750°C, melted by ultrasonic oscillation at a frequency of 35-45 kHz, and injection molded to obtain a titanium alloy material with uniform heat transfer.

[0059] Silicon carbide nanowire material is an artificial covalent bond compound with excellent high-temperature strength, high thermal conductivity, and a huge aspect ratio. It is added to a titanium alloy matrix and combined with ultrasonic oscillation melting to form a disordered distribution to form a heat transfer network, thereby improving the heat transfer uniformity of the mold and enhancing the softening and demolding effect of the glass mold.

[0060] The method for using the production equipment of the microlens glass mold is as follows:

[0061] (1) Under an argon atmosphere, the polished glass blank is placed in the glass blank accommodating cavity 4 formed between the titanium alloy upper mold 1 and the titanium alloy lower mold 2. The power is turned on to heat the titanium alloy upper mold 1 and the titanium alloy lower mold 2 to 650-700°C through the electric heating device 3 to reach the softening point of the glass blank. Then, a pressure of 1.0-2.0 MPa is applied to the titanium alloy upper mold 1 and the titanium alloy lower mold 2 to close the titanium alloy upper mold 1 and the titanium alloy lower mold 2 and the softened glass blank is rolled to form the desired surface shape on the surface of the glass blank;

[0062] (2) Before opening the mold, oxygen is introduced into the glass blank accommodating cavity 4 through the air inlet duct 12 at a rate of 10 mL / min. The ventilation is continued for 20 to 30 minutes and then stopped. After naturally cooling to room temperature, the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are opened and the finished glass mold is taken out.

[0063] The production equipment of the present invention carries out the entire process of placing the glass blank into the glass blank accommodating cavity 4 in an oxygen-free argon atmosphere. In this environment, the glass blank release agent coated on the surface of the titanium alloy upper mold 1 and the titanium alloy lower mold 2 will not burn, and can prevent the surface oxidation of the upper and lower molds. After the molds are closed and heated, oxygen is introduced into the glass blank accommodating cavity 4 through the air inlet duct 12. On the one hand, the introduced oxygen is introduced from a position tangent to the arc-shaped inner surface of the titanium alloy upper mold 1, so it can directly act between the inner surface of the mold and the glass blank, and is in direct contact with the glass blank release agent. Since the glass blank release agent contains graphite, it will react in situ under the action of high temperature and oxygen to produce a carbon dioxide release layer, and produce an excellent demolding effect through in-situ gas expansion. Example 1

[0064] A production device for a microlens glass mold comprises a titanium alloy upper mold 1 and a titanium alloy lower mold 2, which are matched and arranged to form a glass blank accommodating cavity 4 for placing a glass blank to be rolled into a lens mold. A plurality of electric heating devices 3 are inserted into the base of the titanium alloy upper mold 1 and the titanium alloy lower mold 2, which are used to heat the titanium alloy upper mold 1 and the titanium alloy lower mold 2 so that the glass blank in the glass blank accommodating cavity 4 is softened by heat and rolled into a required shape. The arc-shaped inner surface of the titanium alloy upper mold 1 is evenly provided with multiple circles of concentric circular protruding micro-dot structures 11, each of the micro-dot structures 11 includes a convex lens structure 111 located at the center of the circle and multiple circles of concentric serrated edge structures 112 located on the periphery of the convex lens structure 111. The side wall of the titanium alloy upper mold 1 is also provided with an air inlet channel 12 tangent to its arc-shaped inner surface, which is used to introduce gas into the demolding surface for facilitating demolding.

[0065] The inner surfaces of the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are both provided with a glass body release agent layer, and the glass body release agent layer comprises the following raw materials in parts by weight:

[0066] 40 parts by mass of 50% aluminum hydrogen phosphate solution;

[0067] 8 parts of colloidal graphite powder with a particle size of 1.3 μm;

[0068] 2 parts barium fluoride;

[0069] 0.2 parts of ethylene glycol butyl ether;

[0070] 0.2 parts of ethylene glycol butyl ether;

[0071] 20 parts distilled water.

[0072] The forming process of the glass body release agent layer is:

[0073] After the raw materials of the glass body release agent layer are prepared into a coating, the coating is sprayed on the mold surface with a spray gun to form a uniform coating, which reaches 100 μm after air drying and hardening; then the coating is placed in an electric oven for heat treatment, first at 60°C for 2 minutes, then heated to 110°C for 20 minutes, and then heated to 300°C for 1 hour.

[0074] The titanium alloy upper die 1 and the titanium alloy lower die 2 are both made of titanium alloy material with uniform heat conduction;

[0075] The preparation method of the titanium alloy material with uniform heat transfer is as follows:

[0076] (1) Apricot shell carbon and silicon dioxide were mixed and ground in a mass ratio of 3:1 to obtain a mixture, which was placed in a graphite crucible. The graphite crucible was then pushed into a tubular sintering furnace and heated to 1400°C under an argon atmosphere. After high-temperature reaction for 2 hours, the temperature was lowered to 600°C. The power supply and gas source were turned off, and the reaction product was taken out after cooling with the furnace. Finally, carbon was removed at 700°C for 2 hours to obtain silicon carbide nanowires.

[0077] (2) A 6 g / L aluminum nitrate solution was prepared and placed in a sealable container. Isopropyl alcohol was added and the silicon carbide nanowires were immersed in the aluminum nitrate solution. After nitrogen was introduced for 15 minutes, the container was quickly sealed and the sealed container was irradiated with gamma rays at room temperature. The irradiation dose was 70 KGy and the dose rate was 70 Gy / min. After the irradiation reaction was completed, the silicon carbide nanowires were taken out and dried to obtain a self-made thermal conductive filler.

[0078] (3) By weight, 4.5 parts of Al, 2.0 parts of Fe, 1.5 parts of Si, 0.5 parts of Mn, 0.1 parts of Sn, 0.05 parts of Ga, 6.0 parts of self-made thermal conductive filler and 60 parts of Ti were heated to 690°C, melted by ultrasonic oscillation at a frequency of 35 kHz, and injection molded to obtain a titanium alloy material with uniform heat transfer.

[0079] The method for using the production equipment of the microlens glass mold is as follows:

[0080] (1) Under an argon atmosphere, the polished glass blank is placed in the glass blank accommodating cavity 4 formed between the titanium alloy upper mold 1 and the titanium alloy lower mold 2. The power is turned on and the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are heated to 650°C by the electric heating device 3 to reach the softening point of the glass blank. Then, a pressure of 1.0 MPa is applied to the titanium alloy upper mold 1 and the titanium alloy lower mold 2 to close the titanium alloy upper mold 1 and the titanium alloy lower mold 2 and the softened glass blank is rolled to form the desired surface shape on the surface of the glass blank.

[0081] (2) Before opening the mold, oxygen is introduced into the glass blank accommodating cavity 4 through the air inlet duct 12 at a rate of 10 mL / min. After continuous ventilation for 20 minutes, ventilation is stopped. After naturally cooling to room temperature, the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are opened, and the finished glass mold can be taken out. Example 2

[0082] A production device for a microlens glass mold comprises a titanium alloy upper mold 1 and a titanium alloy lower mold 2, which are matched and arranged to form a glass blank accommodating cavity 4 for placing a glass blank to be rolled into a lens mold. A plurality of electric heating devices 3 are inserted into the base of the titanium alloy upper mold 1 and the titanium alloy lower mold 2, which are used to heat the titanium alloy upper mold 1 and the titanium alloy lower mold 2 so that the glass blank in the glass blank accommodating cavity 4 is softened by heat and rolled into a required shape. The arc-shaped inner surface of the titanium alloy upper mold 1 is evenly provided with multiple circles of concentric circular protruding micro-dot structures 11, each of the micro-dot structures 11 includes a convex lens structure 111 located at the center of the circle and multiple circles of concentric serrated edge structures 112 located on the periphery of the convex lens structure 111. The side wall of the titanium alloy upper mold 1 is also provided with an air inlet channel 12 tangent to its arc-shaped inner surface, which is used to introduce gas into the demolding surface for facilitating demolding.

[0083] The inner surfaces of the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are both provided with a glass body release agent layer, and the glass body release agent layer comprises the following raw materials in parts by weight:

[0084] 45 parts by mass of 50% aluminum hydrogen phosphate solution;

[0085] 9 parts of colloidal graphite powder with a particle size of 1.1 μm;

[0086] 4 parts barium fluoride;

[0087] 0.4 parts of ethylene glycol butyl ether;

[0088] 0.4 parts of ethylene glycol butyl ether;

[0089] 23 parts distilled water.

[0090] The forming process of the glass body release agent layer is:

[0091] After the raw materials of the glass body release agent layer are prepared into a coating, the coating is sprayed on the mold surface with a spray gun to form a uniform coating, which reaches 130 μm after air drying and hardening; then the coating is placed in an electric oven for heat treatment, first at 65°C for 2 minutes, then heated to 115°C for 20 minutes, and then heated to 330°C for 1 hour.

[0092] The titanium alloy upper die 1 and the titanium alloy lower die 2 are both made of titanium alloy material with uniform heat conduction;

[0093] The preparation method of the titanium alloy material with uniform heat transfer is as follows:

[0094] (1) Apricot shell carbon and silicon dioxide were mixed and ground in a mass ratio of 3:1 to obtain a mixture, which was placed in a graphite crucible. The graphite crucible was then pushed into a tubular sintering furnace and heated to 1400°C under an argon atmosphere. After high-temperature reaction for 3 hours, the temperature was lowered to 600°C. The power supply and gas source were turned off, and the reaction product was taken out after cooling with the furnace. Finally, carbon was removed at 700°C for 2 hours to obtain silicon carbide nanowires.

[0095] (2) A 6 g / L aluminum nitrate solution was prepared and placed in a sealable container. Isopropyl alcohol was added and the silicon carbide nanowires were immersed in the aluminum nitrate solution. After nitrogen was introduced for 15 minutes, the container was quickly sealed and the sealed container was irradiated with gamma rays at room temperature. The irradiation dose was 70 KGy and the dose rate was 70 Gy / min. After the irradiation reaction was completed, the silicon carbide nanowires were taken out and dried to obtain a self-made thermal conductive filler.

[0096] (3) By weight, 4.8 parts of Al, 2.3 parts of Fe, 1.8 parts of Si, 0.7 parts of Mn, 0.2 parts of Sn, 0.08 parts of Ga, 6.3 parts of self-made thermal conductive filler and 65 parts of Ti were heated to 720°C, melted by ultrasonic oscillation at a frequency of 40 kHz, and injection molded to obtain a titanium alloy material with uniform heat transfer.

[0097] The method for using the production equipment of the microlens glass mold is as follows:

[0098] (1) Under an argon atmosphere, the polished glass blank is placed in the glass blank accommodating cavity 4 formed between the titanium alloy upper mold 1 and the titanium alloy lower mold 2. The power is turned on and the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are heated to 680°C by the electric heating device 3 to reach the softening point of the glass blank. Then, a pressure of 1.5 MPa is applied to the titanium alloy upper mold 1 and the titanium alloy lower mold 2 to close the titanium alloy upper mold 1 and the titanium alloy lower mold 2 and the softened glass blank is rolled to form the desired surface shape on the surface of the glass blank;

[0099] (2) Before opening the mold, oxygen is introduced into the glass blank accommodating cavity 4 through the air inlet duct 12 at a rate of 10 mL / min. After continuous ventilation for 25 minutes, ventilation is stopped. After naturally cooling to room temperature, the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are opened, and the finished glass mold can be taken out. Example 3

[0100] A production device for a microlens glass mold comprises a titanium alloy upper mold 1 and a titanium alloy lower mold 2, which are matched and arranged to form a glass blank accommodating cavity 4 for placing a glass blank to be rolled into a lens mold. A plurality of electric heating devices 3 are inserted into the base of the titanium alloy upper mold 1 and the titanium alloy lower mold 2, which are used to heat the titanium alloy upper mold 1 and the titanium alloy lower mold 2 so that the glass blank in the glass blank accommodating cavity 4 is softened by heat and rolled into a required shape. The arc-shaped inner surface of the titanium alloy upper mold 1 is evenly provided with multiple circles of concentric circular protruding micro-dot structures 11, each of the micro-dot structures 11 includes a convex lens structure 111 located at the center of the circle and multiple circles of concentric serrated edge structures 112 located on the periphery of the convex lens structure 111. The side wall of the titanium alloy upper mold 1 is also provided with an air inlet channel 12 tangent to its arc-shaped inner surface, which is used to introduce gas into the demolding surface for facilitating demolding.

[0101] The inner surfaces of the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are coated with a glass body release agent layer, and the glass body release agent layer comprises the following raw materials in parts by weight:

[0102] 50 parts by mass of 50% aluminum hydrogen phosphate solution;

[0103] 10 parts of colloidal graphite powder with a particle size of 1.2 μm;

[0104] 5 parts of barium fluoride;

[0105] 0.5 parts of ethylene glycol butyl ether;

[0106] 0.5 parts of ethylene glycol butyl ether;

[0107] 25 parts distilled water.

[0108] The forming process of the glass body release agent layer is:

[0109] After the raw materials of the glass body release agent layer are prepared into a coating, the coating is sprayed on the mold surface with a spray gun to form a uniform coating, which reaches 150 μm after air drying and hardening; then the coating is placed in an electric oven for heat treatment, first at 70°C for 2 minutes, then heated to 120°C for 20 minutes, and then heated to 350°C for 1 hour.

[0110] The titanium alloy upper die 1 and the titanium alloy lower die 2 are both made of titanium alloy material with uniform heat conduction;

[0111] The preparation method of the titanium alloy material with uniform heat transfer is as follows:

[0112] (1) Apricot shell carbon and silicon dioxide were mixed and ground in a mass ratio of 3:1 to obtain a mixture, which was placed in a graphite crucible. The graphite crucible was then pushed into a tubular sintering furnace and heated to 1400°C under an argon atmosphere. After high-temperature reaction for 3 hours, the temperature was lowered to 600°C. The power supply and gas source were turned off, and the reaction product was taken out after cooling with the furnace. Finally, carbon was removed at 700°C for 2 hours to obtain silicon carbide nanowires.

[0113] (2) A 6 g / L aluminum nitrate solution was prepared and placed in a sealable container. Isopropyl alcohol was added and the silicon carbide nanowires were immersed in the aluminum nitrate solution. After nitrogen was introduced for 15 minutes, the container was quickly sealed and the sealed container was irradiated with gamma rays at room temperature. The irradiation dose was 70 KGy and the dose rate was 70 Gy / min. After the irradiation reaction was completed, the silicon carbide nanowires were taken out and dried to obtain a self-made thermal conductive filler.

[0114] (3) By weight, 5.0 parts of Al, 2.5 parts of Fe, 2.0 parts of Si, 0.8 parts of Mn, 0.3 parts of Sn, 0.10 parts of Ga, 6.5 parts of self-made thermal conductive filler and 70 parts of Ti were heated to 750°C, melted by ultrasonic oscillation at a frequency of 45 kHz, and injection molded to obtain a titanium alloy material with uniform heat transfer.

[0115] The method for using the production equipment of the microlens glass mold is as follows:

[0116] (1) Under an argon atmosphere, the polished glass blank is placed in the glass blank accommodating cavity 4 formed between the titanium alloy upper mold 1 and the titanium alloy lower mold 2. The power is turned on and the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are heated to 700°C by the electric heating device 3 to reach the softening point of the glass blank. Then, a pressure of 2.0 MPa is applied to the titanium alloy upper mold 1 and the titanium alloy lower mold 2 to close the titanium alloy upper mold 1 and the titanium alloy lower mold 2 and the softened glass blank is rolled to form the desired surface shape on the surface of the glass blank.

[0117] (2) Before opening the mold, oxygen is introduced into the glass blank accommodating cavity 4 through the air inlet duct 12 at a rate of 10 mL / min. The ventilation is continued for 30 minutes and then stopped. After naturally cooling to room temperature, the titanium alloy upper mold 1 and the titanium alloy lower mold 2 are opened and the finished glass mold is taken out.

[0118] Control Example

[0119] Comparative Example 1

[0120] The contents of this comparative example are basically the same as those of Example 1 of the present invention, except that the micro-dot structure (11) directly adopts a convex lens structure of the same size, replacing the convex lens structure located at the center of the circle and the multi-circle concentric sawtooth edge structure located at the periphery of the convex lens structure in Example 1. A micro-lens glass mold production device is also prepared, and a glass mold is also prepared;

[0121] Comparative Example 2

[0122] The contents of this comparative example are basically the same as those of Example 1 of the present invention, except that the inner surfaces of the titanium alloy upper mold and the titanium alloy lower mold do not have a glass body release agent layer. Similarly, a microlens glass mold production device and a glass mold are manufactured.

[0123] Comparative Example 3

[0124] The contents of this comparative example are substantially the same as those of Example 1 of the present invention, except that silicon carbide nanowires are not added to the carbon alloy material for uniform heat transfer. A microlens glass mold production device and a glass mold are also prepared.

[0125] Comparative Example 4

[0126] The contents of this comparative example are substantially the same as those of Example 1 of the present invention, except that the silicon carbide nanowires added to the carbon alloy material having uniform heat transfer were not modified by gamma irradiation. A microlens glass mold production device and a glass mold were also produced.

[0127] Comparative Example 5

[0128] The contents of this comparative example are basically the same as those of Example 1 of the present invention, except that argon gas instead of oxygen is introduced into the glass blank accommodating cavity through the air inlet channel during use of the production equipment, and a glass mold is also produced.

[0129] Performance testing

[0130] Test items:

[0131] Demolding loss: Weigh the mass of the glass blank m1 and the mass of the glass mold after melt rolling and molding m2 respectively, and calculate the ratio of the mass difference between the two to the mass of the glass blank. The higher the ratio, the worse the demolding effect. Demolding loss = (m1-m2) / m1×100%.

[0132] Demolding effect: observe the surface cleanliness and glossiness of the glass mold after demoulding;

[0133] Thermal conductivity: The thermal conductivity was measured using a thermal conductivity meter.

[0134] The performance tests of Examples 1 to 3 and Comparative Examples 1 to 5 were performed respectively, and the test results are shown in Table 1:

[0135]

[0136] It can be seen from the test data in the above table that the thermal conductivity of the production equipment in Examples 1 to 3 of the present invention and the demolding effect of the glass mold finally prepared are both excellent, thereby confirming the high feasibility of the technical solution of the present application;

[0137] Next, a performance comparison was conducted between Control Example 1 and Example 1 of the present invention. Because the micro-dot structure in Control Example 1 directly employed a convex lens structure of the same size, replacing the convex lens structure located at the center of the circle and the multi-ring concentric sawtooth ridge structure located at the periphery of the convex lens structure in Example 1, a micro-lens glass mold production device and a glass mold were also produced. This resulted in a reduced demolding effect of the final glass mold. This confirms that the micro-dot structure of the present invention is composed of many tiny concentric circular patterned sheet structures, each of which is actually a different prism. These patterns reduce the overall thickness of the lens. Therefore, the defocused lens design allows for a significant reduction in lens thickness, weight, and volume. Furthermore, the multi-ring pattern design increases the surface area of ​​the glass blank coated with a release agent, thereby increasing the probability of demolding by in-situ gas expansion and improving the mold demolding effect.

[0138] The performance of Control Example 2 and Example 1 of the present invention are compared. Since there is no glass body release agent layer on the inner surface of the titanium alloy upper mold and the titanium alloy lower mold in Control Example 2, a microlens glass mold production device and a glass mold are also prepared; resulting in a significant reduction in the demolding effect of the final glass mold. This confirms that in the glass body release agent layer of the present invention, aluminum hydrogen phosphate is an inorganic binder with high stability under high temperature conditions. During the heating process, free water disappears first, aluminum metaphosphate undergoes polymerization, and aluminum metal cations form a network structure between each metaphosphate chain, thereby generating high-temperature bonding performance, allowing the graphite solid lubricating release agent to adhere to the mold surface and promote glass demolding; colloidal graphite powder It is a solid lubricant with good processability, thermal stability, plasticity, acid resistance, chemical stability of organic solvents, and excellent thermal conductivity, which is beneficial to the transfer of heat on the mold surface, so that the contact surface between the glass blank and the mold is evenly heated, which facilitates the subsequent softening, molding and demolding of the glass blank. Barium fluoride has excellent anti-wear and antioxidant properties. Adding barium fluoride to the release agent can improve the mold's antioxidant properties, increase the mold's service life, and prevent mold surface deformation from affecting the accuracy of the final glass mold product. Ethylene glycol butyl ether, as a surfactant, is beneficial to the wetting, dispersion and suspension of powders such as graphite in the binder, and is also beneficial to the wet adhesion of the coating to the mold surface, thereby enhancing the final demolding effect. The glass blank release agent layer of the present invention has not only its own lubricating and demolding function, but also, because the graphite powder is a carbon-based raw material, it will react with the oxygen introduced into the subsequent air inlet channel and high temperature conditions to generate gaseous carbon dioxide. The generated gaseous carbon dioxide exists as a gas medium between the mold and the glass blank, plays a gas expansion demolding role, and improves the mold demolding effect. Since the generated carbon dioxide is generated in situ, the gas medium generated between the mold and the glass blank can be made more uniform, which is better than directly introducing carbon dioxide from the air inlet channel for demolding.

[0139] Next, the performance of Control Examples 3 and 4 was compared with Example 1 of the present invention. Since silicon carbide nanowires were not added to the carbon alloy material with uniform heat transfer in Control Example 3, and the silicon carbide nanowires added to the carbon alloy material with uniform heat transfer in Control Example 4 were not modified by gamma irradiation, both control examples were used to produce microlens glass mold production equipment and glass molds. The thermal conductivity of the glass mold was reduced, and the demolding effect was correspondingly reduced. This confirms that silicon carbide nanowires are added to the carbon alloy material with uniform heat transfer used to prepare the titanium alloy upper mold and the titanium alloy lower mold of the present invention. The silicon carbide nanowire material is an artificial covalent bond compound with excellent high-temperature strength, high thermal conductivity, and a large aspect ratio. When incorporated into the titanium alloy matrix and combined with ultrasonic oscillation melting, it is randomly distributed to form a heat transfer network, which improves the heat transfer uniformity of the mold and enhances the softening and demolding effect of the glass mold. The present invention places silicon carbide nanowires in a mixed solution of metal salts and free radical scavengers, and uses environmentally friendly, efficient and easy-to-control gamma irradiation to reduce metal ions into metal elements in one step. The metal ions are then deposited on the surface of the silicon carbide nanowires to form a self-made thermally conductive filler with an aluminum metal layer on the surface. The aluminum layer on the surface of the filler is used to improve its compatibility with the titanium alloy substrate when it is melted, so that the filler can be more evenly dispersed in the aluminum alloy matrix, thereby improving the heat transfer performance of the mold matrix and further improving the calendering and demolding effects of the glass blank.

[0140] Finally, the performance of Control Example 5 and Example 1 of the present invention was compared. Since argon gas was introduced into the glass blank accommodating cavity through the air inlet channel instead of oxygen during the use of the production equipment of Control Example 5, the glass mold produced was also significantly reduced in demolding effect. This confirms that the production equipment of the present invention operates in an oxygen-free argon atmosphere during the entire process of placing the glass blank into the glass blank accommodating cavity. In this environment, the glass blank release agent coated on the surface of the titanium alloy upper mold and the titanium alloy lower mold will not burn and can prevent the surface oxidation of the upper and lower molds. After the mold is closed and heated, oxygen is introduced into the glass blank accommodating cavity through the air inlet channel. On the one hand, the oxygen introduced is introduced from a position tangent to the curved inner surface of the titanium alloy upper mold, so it can directly act between the inner surface of the mold and the glass blank, and directly contact the glass blank release agent. Because the glass blank release agent contains graphite, it will react in situ to produce a carbon dioxide release layer under the action of high temperature and oxygen, and produce an excellent demolding effect through in-situ gas expansion.

[0141] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A production device for a microlens glass mold, characterized by: It comprises a titanium alloy upper mold and a titanium alloy lower mold, the titanium alloy upper mold and the titanium alloy lower mold are matched and arranged, and the two are combined to form a glass blank accommodating cavity for placing the glass blank to be rolled into a lens mold, and a plurality of electric heating devices are inserted into the titanium alloy upper mold and the titanium alloy lower mold base for heating the titanium alloy upper mold and the titanium alloy lower mold, so that the glass blank in the glass blank accommodating cavity is softened by heat and rolled into a required shape, the arc-shaped inner surface of the titanium alloy upper mold is evenly provided with a plurality of circles of concentric circular protruding micro-dot structures, each of the micro-dot structures includes a convex lens structure located at the center of the circle and a plurality of circles of concentric serrated edge structures located on the periphery of the convex lens structure, and the side wall of the titanium alloy upper mold is also provided with an air inlet channel tangent to its arc-shaped inner surface, for introducing gas into the demoulding surface to facilitate demoulding; The titanium alloy upper mold and the titanium alloy lower mold are both made of titanium alloy material with uniform heat transfer; The preparation method of the titanium alloy material with uniform heat transfer is as follows: (1) Apricot shell carbon and silicon dioxide are mixed and ground in a mass ratio of 3:1 to obtain a mixture, the mixture is placed in a graphite crucible, and the graphite crucible is pushed into a tubular sintering furnace, heated to 1400°C under an argon atmosphere, and after high-temperature reaction for 2 to 3 hours, the temperature is lowered to 600°C, the power supply and gas source are turned off, and the reaction product is taken out after cooling with the furnace, and finally decarbonized at 700°C for 2 hours to obtain silicon carbide nanowires; (2) A 6 g / L aluminum nitrate solution was prepared and placed in a sealable container. Isopropyl alcohol was added and the silicon carbide nanowires were immersed in the aluminum nitrate solution. After nitrogen was introduced for 15 minutes, the container was quickly sealed and the sealed container was irradiated with gamma rays at room temperature. The irradiation dose was 70 KGy and the dose rate was 70 Gy / min. After the irradiation reaction was completed, the silicon carbide nanowires were taken out and dried to obtain a self-made thermal conductive filler. (3) By weight, 4.5-5.0 parts of Al, 2.0-2.5 parts of Fe, 1.5-2.0 parts of Si, 0.5-0.8 parts of Mn, 0.1-0.3 parts of Sn, 0.05-0.10 parts of Ga, 6.0-6.5 parts of self-made thermal conductive filler and 60-70 parts of Ti are heated to 690-750°C, melted by ultrasonic oscillation at a frequency of 35-45 kHz, and injection molded to obtain a titanium alloy material with uniform heat transfer.

2. The production equipment for a microlens glass mold according to claim 1, characterized in that: The inner surfaces of the titanium alloy upper mold and the titanium alloy lower mold are both provided with a glass body release agent layer.

3. The method for using the production equipment for a microlens glass mold according to claim 1, wherein: The specific steps are: (1) Under an argon atmosphere, the polished glass blank is placed in a glass blank accommodating cavity formed between a titanium alloy upper mold and a titanium alloy lower mold. The power is turned on to heat the titanium alloy upper mold and the titanium alloy lower mold to 650-700°C through an electric heating device to reach the softening point of the glass blank. Then, a pressure of 1.0-2.0 MPa is applied to the titanium alloy upper mold and the titanium alloy lower mold to close the titanium alloy upper mold and the softened glass blank is rolled to form the desired surface shape on the surface of the glass blank. (2) Before opening the mold, oxygen is introduced into the glass blank cavity through the air inlet channel at a rate of 10 mL / min. The ventilation is continued for 20 to 30 minutes and then stopped. After naturally cooling to room temperature, the titanium alloy upper mold and the titanium alloy lower mold are opened and the finished glass mold is taken out.

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