Forming mold and preparation method thereof, and forming method of curved glass

Abstract

The present invention relates to a forming mold, a preparation method thereof, and a forming method for curved glass. The forming mold comprises a male mold and a female mold, wherein the raised portion of the male mold and the recessed portion of the female mold can form a cavity after the molds are closed, and the cavity surface is defined as the forming surface. The forming surface and the surface extending 2mm to 3mm along the forming surface are non-coated areas, and the other surfaces of the male mold and the female mold are coated areas. The coated area of ​​the male mold is provided with a first anti-oxidation coating, and the coated area of ​​the female mold is provided with a second anti-oxidation coating. The mass of the first anti-oxidation coating is 0.2g / cm 2 ~0.7g / cm 2 The mass of the second anti-oxidation coating is 0.3 g / cm 2 ~1.0g / cm 2 The molding die of the present invention can solve the problem of defective concave and convex points in products.

Description

Technical Field

[0001] The present invention relates to the technical field of curved glass molding, and in particular to a molding mold and a preparation method thereof, and a method for molding curved glass. Background Art

[0002] Curved glass can be formed using molds. Glass molding requires a high-temperature environment, and molds are susceptible to oxidation in high-temperature, oxygen-rich environments, leading to mold powder loss. When graphite mold powder sheds, graphite particles adhere to the glass or mold surface. Under pressure, the glass surface, softened by the high temperature, is squeezed by the graphite particles, forming concave or convex spots, seriously affecting the surface quality of the molded glass.

[0003] In order to solve the problem of bad bumps, taking graphite molds as an example, there are currently two main application solutions in the industry. One is to modify the graphite material as a whole and add oxidation inhibitors inside the graphite material to achieve the purpose of improving the material's antioxidant properties. The second is to prepare an appropriate impregnating agent, prepare it into a solution, and then impregnate the graphite mold as a whole. For option one, adding too much inhibitor will reduce the mechanical and thermal properties of the graphite material. Adding too little will not be able to isolate oxygen, so it is impossible to improve the antioxidant properties without changing the original properties. For option two, the entire graphite mold needs to be impregnated, which will affect the accuracy of the mold cavity surface, and thus affect the size and surface quality of the glass. Summary of the Invention

[0004] Based on this, the present invention provides a forming mold and a preparation method thereof, and a forming method for curved glass.

[0005] The first aspect of the present invention provides a forming die. The technical solution is as follows:

[0006] A forming mold, comprising a male mold and a female mold, wherein the raised portion of the male mold and the recessed portion of the female mold can form a cavity after the molds are closed, wherein the cavity surface is defined as a forming surface, the forming surface and the surface extending 2 mm to 3 mm along the forming surface are non-coating areas, and the other surfaces of the male mold and the female mold are coating areas;

[0007] The coating area of ​​the male mold is provided with a first anti-oxidation coating, and the coating area of ​​the female mold is provided with a second anti-oxidation coating;

[0008] The mass of the first anti-oxidation coating is 0.2 g / cm 2 ~0.7g / cm 2 The mass of the second anti-oxidation coating is 0.3 g / cm 2 ~1.0g / cm 2 .

[0009] In some embodiments, the mass of the first anti-oxidation coating is 0.5 g / cm 2 ~0.7g / cm 2 .

[0010] In some embodiments, the mass of the second anti-oxidation coating is 0.6 g / cm 2 ~1.0g / cm 2 .

[0011] In some embodiments, the material of the male mold and the female mold is independently selected from graphite.

[0012] In some embodiments, the first anti-oxidation coating and the second anti-oxidation coating are each independently selected from silicide coatings.

[0013] The second aspect of the present invention provides a method for preparing a forming mold. The technical solution is as follows:

[0014] A method for preparing a forming mold comprises the following steps:

[0015] A punch, a punch cover, a die, and a die cover are provided. The raised portion of the punch and the recessed portion of the die can form a cavity after the molds are closed. The cavity surface is defined as the molding surface. The molding surface and the surface extending 2 mm to 3 mm along the molding surface are non-coated areas. The other surfaces of the punch and die are coated areas.

[0016] placing the male mold covering member on the male mold to expose the coating area of ​​the male mold; placing the female mold covering member on the female mold to expose the coating area of ​​the female mold;

[0017] A first anti-oxidation coating is formed on the coating area of ​​the convex mold until the mass of the first anti-oxidation coating is 0.2 g / cm 2 ~0.7g / cm 2 ; forming a second anti-oxidation coating in the coating area of ​​the die, until the mass of the second anti-oxidation coating is 0.3 / cm 2 ~1.0g / cm 2 , remove the male and female die covering parts.

[0018] In some embodiments, the mass of the first anti-oxidation coating is 0.5 g / cm 2 ~0.7g / cm 2 .

[0019] In some embodiments, the mass of the second anti-oxidation coating is 0.6 g / cm 2 ~1.0g / cm 2 .

[0020] In some embodiments, forming the first anti-oxidation coating and / or the second anti-oxidation layer on the coating area of ​​the male mold and / or the coating area of ​​the female mold comprises the following steps:

[0021] Applying an antioxidant solution to the coating area of ​​the male mold and / or the coating area of ​​the female mold;

[0022] baking the antioxidant solution to form a solidified layer;

[0023] The solidified layer is sintered to form the first anti-oxidation coating layer and / or the second anti-oxidation layer.

[0024] In some embodiments, the coating method is spraying.

[0025] In some embodiments, the spraying process parameters include one or more of the following:

[0026] (a) Nozzle diameter is 0.8 mm ± 0.2 mm; (b) Liquid tank pressure is 0.2 ± 0.05 MPa; (c) Atomization adjustment pressure is 0.2 ± 0.05 MPa; (d) Needle height is 4.85 ± 0.2 mm; and (e) Nozzle movement speed is 1000 mm / s ± 100 mm / s.

[0027] In some embodiments, the baking temperature is 60° C.±5° C., and / or the baking time is 1 h±0.2 h.

[0028] In some embodiments, the sintering temperature is 600° C. to 700° C., and / or the sintering time is 30±5 min.

[0029] In some embodiments, the material of the male mold and the female mold is independently selected from graphite.

[0030] In some embodiments, the antioxidant solution is selected from a silicide solution.

[0031] A third aspect of the present invention provides a method for forming curved glass. The technical solution is as follows:

[0032] A method for forming curved glass comprises the following steps: processing a glass substrate using the above-mentioned forming mold or the forming mold prepared by the above-mentioned preparation method.

[0033] Compared with the traditional solution, the present invention has the following beneficial effects:

[0034] The present invention applies an anti-oxidation coating to the molding surfaces of the male and female molds, as well as to the coating area extending 2 to 3 mm beyond the molding surfaces, and also controls the mass per unit area of ​​the anti-oxidation coating. These measures minimize the mold from oxygen, preventing oxidation from direct contact with oxygen. This resolves the problem of defective bumps and concave spots in the finished product without altering the properties of the mold itself. Furthermore, the anti-oxidation coating minimizes damage to the dimensional accuracy of the molding surfaces. Furthermore, the anti-oxidation coating prevents volatilization of components at high temperatures, which can cause bluing on the molded glass surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more fully understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0036] Figure 1 is a schematic diagram of a male mold, a female mold, and a cover member in one embodiment;

[0037] Figure 2 Schematic diagram of a male mold, a female mold and a cover in another embodiment. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to specific embodiments. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the present disclosure.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] the term

[0041] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0042] In the present invention, the selection range of "and / or", "or / and", and "and / or" includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, and the said any and all combinations include any combination of two related listed items, any more related listed items, or all related listed items. It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that the technical solution undoubtedly includes technical solutions connected by "logical and" and technical solutions connected by "logical or". For example, "A and / or B" includes three parallel solutions of A, B and A+B. For example, the technical solution of "A, and / or, B, and / or, C, and / or, D" includes any one of A, B, C, and D (that is, the technical solution of all being connected by "logical OR"), and also includes any and all combinations of A, B, C, and D, that is, the combination of any two or any three of A, B, C, and D, and also includes the four-item combination of A, B, C, and D (that is, the technical solution of all being connected by "logical AND").

[0043] In the present invention, "plurality", "multiple", "multiple times", "multiple", etc., unless otherwise specified, refer to a number greater than or equal to 2. For example, "one or more" means one or more than or equal to two.

[0044] In the present invention, “preferred”, “better”, “more preferred” and “suitable” are only used to describe implementation methods or examples with better effects, and it should be understood that they do not constitute a limitation on the scope of protection of the present invention.

[0045] In the present invention, the terms “further”, “further”, “particularly”, etc. are used for descriptive purposes to indicate differences in content, but should not be understood as limiting the scope of protection of the present invention.

[0046] In this disclosure, the terms "optionally," "optional," and "optional" are optional and refer to either option, i.e., to the selection of either option from the two parallel options of "optional" or "optional." If multiple "optional" terms appear in a technical solution, each "optional" term is independent unless otherwise specified and there are no conflicts or constraints.

[0047] In the present invention, in the "first aspect," "second aspect," "third aspect," "fourth aspect," etc., the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, "first," "second," "third," "fourth," etc. serve only as non-exhaustive enumeration and description and should be understood not to constitute a closed-ended limitation on quantity.

[0048] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0049] In the present invention, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval and includes the two numerical endpoints of the numerical range (i.e., the minimum value and the maximum value), as well as each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints. In this article, it is equivalent to directly listing each integer, such as t is an integer selected from 1 to 10, indicating that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0050] The temperature parameters in the present invention, unless otherwise specified, may be either constant temperature or fluctuating within a certain temperature range. It should be understood that the constant temperature treatment allows for temperature fluctuations within the precision range of the instrument control. Fluctuations within ranges such as ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are permitted.

[0051] One embodiment of the present invention provides a molding die, comprising a male mold and a female mold, wherein the raised portion of the male mold and the recessed portion of the female mold can form a cavity after the molds are closed, wherein the cavity surface is defined as a molding surface, the molding surface and the surface extending 2 mm to 3 mm along the molding surface are non-coating areas, and the other surfaces of the male mold and the female mold are coating areas;

[0052] The coating area of ​​the male mold is provided with a first anti-oxidation coating, and the coating area of ​​the female mold is provided with a second anti-oxidation coating;

[0053] The mass of the first anti-oxidation coating is 0.2 g / cm 2 ~0.7g / cm 2 The mass of the second anti-oxidation coating is 0.3 g / cm 2 ~1.0g / cm 2 .

[0054] This embodiment applies an anti-oxidation coating to the molding surfaces of the male and female molds, as well as to the coating area extending 2mm to 3mm beyond the molding surfaces. The weight of the anti-oxidation coating per unit area is also controlled. These measures minimize the mold from oxygen, preventing oxidation from direct contact with oxygen. This resolves the issue of defective bumps and concave spots in the finished product without altering the properties of the mold. Furthermore, the anti-oxidation coating minimizes damage to the dimensional accuracy of the molding surfaces. Furthermore, the anti-oxidation coating prevents volatilization of components at high temperatures, which can cause a bluish appearance on the finished glass surface.

[0055] In this embodiment, the mass per unit area of ​​the anti-oxidation coating on the male and female molds needs to be strictly controlled. Preferably, the mass of the first anti-oxidation coating is 0.5 g / cm 2 ~0.7g / cm 2 Preferably, the mass of the second anti-oxidation coating is 0.6 g / cm 2 ~1.0g / cm 2 .

[0056] In this embodiment, the material of the male mold and the female mold is independently selected from graphite.

[0057] In this embodiment, the first anti-oxidation coating and the second anti-oxidation coating are each independently selected from a silicide coating, such as a silicon dioxide coating, a silicon nitride coating, or a silicon carbide coating.

[0058] The molding die of this embodiment can extend the service life by more than 50%. Using the molding die of this embodiment can reduce the proportion of concave and convex points to below 0.5%, thereby improving the hot bending yield.

[0059] One embodiment of the present invention provides a method for preparing the above-mentioned forming mold, which comprises the following steps:

[0060] Step 1: See Figure 1 , is a cross-sectional view of the punch, die and cover of this embodiment, providing a punch 10, the punch 10 having a raised portion. In this embodiment, the material of the punch is graphite.

[0061] Step 2: Provide a die 20 having a recessed portion. In this embodiment, the die is made of graphite.

[0062] Step 3: Provide a cover 30. In this embodiment, the cover is a flat plate, which serves as both the male mold cover and the female mold cover. That is, in this embodiment, the male mold and the female mold share the same cover, which is a flat plate. In other embodiments, the male mold and the female mold can each use two covers. Optionally, the male mold cover and the female mold cover can be obtained by hot bending the flat plate cover (using the male mold 10 and the female mold 20 as described above), as shown in FIG. Figure 2 Optionally, the material of the cover may be PMMA (polymethyl methacrylate).

[0063] Step 4: In this embodiment, the male mold 10 and the female mold 20 need to be cleaned, for example, dust particles or other impurities on the surface need to be cleaned to ensure that the anti-oxidation coating has a strong bonding force with the mold.

[0064] Step 5: Place a cover 30 on the male mold 10, covering the molding surface and the non-coated area extending 2mm to 3mm from the molding surface, leaving the coated area of ​​the male mold exposed. Place a cover 30 on the female mold 20, covering the molding surface and the non-coated area extending 2mm to 3mm from the molding surface, leaving the coated area of ​​the female mold exposed.

[0065] The above setting can avoid contamination of the molding area to the greatest extent, and avoid damage to the dimensional accuracy of the molding surface by the antioxidant coating to the greatest extent, thereby ensuring the surface quality of the product; it can also avoid the volatilization of components in the antioxidant coating at high temperatures, which may cause the blueing phenomenon on the surface of the molded glass.

[0066] Step 6: Form a first anti-oxidation coating on the coating area of ​​the male mold until the mass of the first anti-oxidation coating is 0.2 g / cm 2 ~0.7g / cm 2 ; forming a second anti-oxidation coating in the coating area of ​​the die, until the mass of the second anti-oxidation coating is 0.3 / cm 2 ~1.0g / cm 2 , remove the cover 30.

[0067] Figure 2 In the figure, except for the surface on one side where the protrusion and the depression between the two dotted lines are located, the other surfaces are covered with the anti-oxidation layer.

[0068] In this embodiment, the mass per unit area of ​​the anti-oxidation coating on the male and female molds needs to be strictly controlled. Preferably, the mass of the first anti-oxidation coating is 0.5 g / cm 2 ~0.7g / cm 2 Preferably, the mass of the second anti-oxidation coating is 0.6 g / cm 2 ~1.0g / cm 2 .

[0069] Optionally, forming the first anti-oxidation coating on the coating area of ​​the male mold comprises the following steps:

[0070] Applying an antioxidant solution to the coating area of ​​the male mold;

[0071] baking the antioxidant solution to form a solidified layer;

[0072] The solidified layer is sintered to form a first anti-oxidation coating.

[0073] Optionally, forming the second anti-oxidation coating on the coating area of ​​the concave mold includes the following steps:

[0074] Applying an antioxidant solution to the coating area of ​​the concave mold;

[0075] baking the antioxidant solution to form a solidified layer;

[0076] The solidified layer is sintered to form a second anti-oxidation coating.

[0077] In this embodiment, the coating dosage of the antioxidant solution is adjusted so that the final coating quality meets the above requirements.

[0078] In this embodiment, the antioxidant solution is selected from a silicide solution, such as a silicon dioxide solution, a silicon nitride solution, or a silicon carbide solution.

[0079] In this embodiment, the coating method is spraying. It is understood that spraying can be performed using an inkjet printer. Compared with manual wiping, it is more efficient and the coating thickness is more uniform.

[0080] Optionally, the spraying process parameters include one or more of the following:

[0081] (a) Nozzle diameter is 0.8 mm ± 0.2 mm; (b) Liquid tank pressure is 0.2 ± 0.05 MPa; (c) Atomization adjustment pressure is 0.2 ± 0.05 MPa; (d) Needle height is 4.85 ± 0.2 mm; (e) Nozzle movement speed is 1000 mm / s ± 100 mm / s.

[0082] Optionally, the baking temperature is 60°C ± 5°C.

[0083] Optionally, the baking time is 1 h±0.2 h.

[0084] By baking, the antioxidants on the male and female molds are fully penetrated and filled into the surface micropores and defects inside the male and female molds, and solidified to form a dense solidified layer.

[0085] Optionally, the sintering temperature is 600°C to 700°C

[0086] Optionally, the sintering time is 30±5 min.

[0087] Sintering can be completed using a 3D hot bending machine, and the solidified layer formed by baking is air-fired to enable the forming mold to achieve better mechanical and thermal properties.

[0088] The molding die prepared by the preparation method of this embodiment can produce 400 PCS (number of pieces) to 600 PCS (number of pieces) of products. In order to prevent the anti-oxidation coating from failing, it can be maintained to continue to produce products.

[0089] Optionally, the maintenance method is to repeat steps 4 to 6.

[0090] One embodiment of the present invention provides a method for forming curved glass, which includes the following steps: processing a glass substrate using the above-mentioned forming mold or the forming mold prepared by the above-mentioned preparation method.

[0091] Optionally, the processing includes a preheating stage, a forming stage and a cooling stage.

[0092] Optionally, the preheating stage includes 5 rounds of treatment, for example: in the first round of treatment, the temperature of the punch is 600±40℃, and the temperature of the die is 550±40℃; in the second round of treatment, the temperature of the punch is 660±40℃, and the temperature of the die is 580±40℃; in the third round of treatment, the temperature of the punch is 680±40, and the temperature of the die is 660±40; in the fourth round of treatment, the temperature of the punch is 700±40℃, and the temperature of the die is 660±40℃; in the fifth round of treatment, the temperature of the punch is 700±40℃, and the temperature of the die is 680±40℃.

[0093] Optionally, the molding stage includes three rounds of treatment, for example: in the first round of treatment, the punch temperature is 680±20°C, the die temperature is 660±20°C, and the pressure is 0.5±0.1MPa; in the second round of treatment, the punch temperature is 650±20°C, the die temperature is 650±20°C, and the pressure is 0.4±0.1MPa; in the third round of treatment, the punch temperature is 640±20°C, the die temperature is 640±20°C, and the pressure is 0.3±0.1MPa.

[0094] Optionally, the cooling stage includes three rounds of treatment, for example: in the first round of treatment, the temperature of the punch is 600±40°C; in the second round of treatment, the temperature of the punch is 500±40°C; in the third round of treatment, the temperature of the punch is 100±20°C.

[0095] The following is further described in conjunction with specific examples and comparative examples. Unless otherwise specified, the raw materials involved in the following specific examples and comparative examples can be sourced from commercial sources. The instruments used can be sourced from commercial sources unless otherwise specified. The processes involved can be selected conventionally by those skilled in the art unless otherwise specified.

[0096] Example 1

[0097] This embodiment provides a forming mold and a method for preparing the same, and 3D glass and a method for preparing the same, and the steps are as follows:

[0098] Step 1: See Figure 1 Prepare 10 sets of male molds 10 and female molds 20 with 3D curved molding surfaces. Wipe the surfaces of the 10 sets of male and female molds clean with a dust-free cloth. Fabricate a PMMA cover 30 to serve as both the male and female mold covers and place them on the male and female molds, respectively. The PMMA cover has dimensions such that when placed on the male and female molds, it covers the molding surface and an uncoated area extending 2 mm to 3 mm beyond the molding surface, leaving the coated areas of the male and female molds exposed.

[0099] Step 2: Use a sprayer to spray an antioxidant solution with a concentration of 1.05g / mL on the coating area of ​​10 groups of convex molds and the coating area of ​​the concave mold. Set the parameters of the sprayer as follows: nozzle diameter is 0.8mm, liquid tank pressure is 0.2MPa, atomization adjustment pressure is 0.2MPa, needle height is 4.85mm, nozzle movement speed is 1000mm / s, and PMMA cover is removed after spraying. Bake the above antioxidant solution at a temperature of 60℃ and a baking time of 1h to form a solidified layer. Sinter the above solidified layer at a sintering temperature of 700℃ and a sintering time of 30min to form a 1cm thick layer on each of the 10 groups of convex molds. 2 The first anti-oxidation coating with a mass of 0.2g, 0.25g, 0.28g, 0.3g, 0.33g, 0.35g, 0.38g, 0.4g, 0.45g, and 0.48g was formed on 10 sets of concave molds with a thickness of 1 cm 2 The second anti-oxidation coating has a mass of 0.3g, 0.34g, 0.38g, 0.40g, 0.45g, 0.48g, 0.5g, 0.52g, 0.55g and 0.58g respectively.

[0100] Step 3: Pair the 10 sets of male molds containing the first anti-oxidation coating with the 10 sets of female molds containing the second anti-oxidation coating in the order listed above to form 10 sets of molding molds. The first set of molding molds includes male molds and female molds, wherein the mass of the first anti-oxidation coating on the male mold is 0.2 g / cm 2 The mass of the second anti-oxidation coating on the die is 0.3g / cm 2 The same applies to the molding dies of groups 2 to 9.

[0101] Step 4: Use the above 10 sets of molding molds to process the glass substrate. The processing includes a preheating stage, a molding stage, and a cooling stage. The parameters of the preheating stage are shown in Table 1, the parameters of the molding stage are shown in Table 2, and the parameters of the cooling stage are shown in Table 3. 200 PCS of 3D glass products are produced.

[0102] Table 1

[0103] Workstation Warm-up 1 Warm-up 2 Warm-up 3 Warm-up 4 Warm-up 5 Punch temperature / ℃ 600 660 680 700 700 Die temperature / ℃ 550 580 660 660 680

[0104] Table 2

[0105] Workstation Molding 1 Forming 2 Forming 3 Punch temperature / ℃ 680 650 640 Die temperature / ℃ 660 650 640 Pressure / MPa 0.5 0.4 0.3

[0106] Table 3

[0107] Workstation Cooling 1 Cooling 2 Cooling 3 Punch temperature / ℃ 600 500 100

[0108] Example 2

[0109] This embodiment provides a forming mold and a preparation method thereof, and a 3D glass and a preparation method thereof, which are basically the same as those in Example 1, with the main difference being that in step 2, the spraying dosages of the coating areas of the 10 groups of male and female molds are different, and the combined molds are different, specifically:

[0110] On the 10 sets of convex molds in step 2, form 2 The first anti-oxidation coating with a mass of 0.5 g, 0.52 g, 0.55 g, 0.58 g, 0.6 g, 0.63 g, 0.65 g, 0.67 g, 0.69 g, and 0.7 g is formed on 10 sets of concave molds with a thickness of 1 cm 2 The second anti-oxidation coating has a mass of 0.6g, 0.65g, 0.7g, 0.75g, 0.8g, 0.85g, 0.9g, 0.95g, 0.98g and 1.0g respectively.

[0111] The 10 groups of convex molds containing the first anti-oxidation coating and the 10 groups of concave molds containing the second anti-oxidation coating were paired one by one in the order listed above to form 10 groups of molding molds, that is, the molding mold of the first group of molding molds includes a convex mold and a concave mold, wherein the mass of the first anti-oxidation coating on the convex mold is 0.5 g / cm 2 The mass of the second anti-oxidation coating on the die is 0.6g / cm 2 The same applies to the molding dies of groups 2 to 9.

[0112] Comparative Example 1

[0113] This comparative example provides a molding mold and a preparation method thereof, and 3D glass and a preparation method thereof, which are basically the same as Example 1, except that: no PMMA cover is used, no spraying treatment is performed, and the glass substrate is directly processed using the 10 sets of male and female molds with 3D curved molding surfaces in step 1 to produce 200 PCS of 3D glass products.

[0114] Comparative Example 2

[0115] This comparative example provides a molding mold and a preparation method thereof, and 3D glass and a preparation method thereof, which are basically the same as Example 1, except that: no PMMA cover is used, and the 10 sets of male and female molds with 3D curved molding surfaces in step 1 are directly immersed in an antioxidant solution, and after being taken out, they are baked and cured according to steps 3 and 4, and then the glass substrate is processed to produce 200 PCS of 3D glass products.

[0116] Comparative Example 3

[0117] This comparative example provides a forming mold and a preparation method thereof, and a 3D glass and a preparation method thereof, which are basically the same as Example 1, with the main difference being that in step 2, the spraying dosages of the coating areas of the 10 groups of male and female molds are different, and the combined molds are different, specifically:

[0118] On the 10 sets of convex molds in step 2, form 2 The first anti-oxidation coating with a mass of 0.73g, 0.75g, 0.78g, 0.80g, 0.82g, 0.85g, 0.88g, 0.9g, 0.95g, and 1.0g was formed on 10 sets of concave molds with a thickness of 1 cm 2 The second anti-oxidation coating has a mass of 1.02g, 1.05g, 1.07g, 1.1g, 1.13g, 1.15g, 1.17g, 1.18g, 1.19g and 1.2g respectively.

[0119] The 10 groups of convex molds containing the first anti-oxidation coating and the 10 groups of concave molds containing the second anti-oxidation coating were paired one by one in the order listed above to form 10 groups of molding molds. The molding mold of the first group includes a convex mold and a concave mold, wherein the mass of the first anti-oxidation coating on the convex mold is 0.73 g / cm 2 The mass of the second anti-oxidation coating on the die is 1.02 g / cm 2 The same applies to the molding dies of groups 2 to 9.

[0120] Comparative Example 4

[0121] This comparative example provides a forming mold and a preparation method thereof, and a 3D glass and a preparation method thereof, which are basically the same as Example 1, with the main difference being that in step 2, the spraying dosages of the coating areas of the 10 groups of male and female molds are different, and the combined molds are different, specifically:

[0122] On the 10 sets of convex molds in step 2, form 2 The first anti-oxidation coating with a mass of 1.02g, 1.05g, 1.07g, 1.1g, 1.13g, 1.15g, 1.17g, 1.18g, 1.19g, and 1.2g is formed on 10 sets of concave molds with a thickness of 1 cm 2The second anti-oxidation coating has a mass of 1.23g, 1.25g, 1.26g, 1.28g, 1.3g, 1.33g, 1.35g, 1.36g, 1.38g and 1.4g respectively.

[0123] Ten groups of convex molds containing the first anti-oxidation coating and ten groups of concave molds containing the second anti-oxidation coating were paired one by one in the order listed above to form ten groups of molding molds. The molding molds of group 1 included a convex mold and a concave mold, wherein the mass of the first anti-oxidation coating on the convex mold was 1.02 g / cm 2 The mass of the second anti-oxidation coating on the die is 1.23 g / cm 2 The same applies to the molding dies of groups 2 to 9.

[0124] Comparative Example 5

[0125] This comparative example provides a molding mold and its preparation method, and 3D glass and its preparation method, which are basically the same as Example 1, with the main difference that: the size of the PMMA cover in step 1 satisfies: when the PMMA cover is placed on the male mold and the female mold, the covered area is only the molding surface.

[0126] IPQC appearance inspection was performed on 200 pieces of 3D glass prepared in the examples and comparative examples. The inspection items and results are shown in Table 4.

[0127] Table 4

[0128]

[0129]

[0130] It can be seen that:

[0131] 1. In Examples 1 and 2, the 3D glass products had a small proportion of concave and convex points, a low defect rate, no appearance defects such as dirtiness and bluing, and a long mold life. In Comparative Example 1, the male and female molds were not coated with an antioxidant coating, resulting in a large proportion of concave and convex points in the 3D glass products, a high defect rate, and a short mold life.

[0132] 2. The mass per unit area of ​​the anti-oxidation coating on the male and female molds must be strictly controlled. The results of Comparative Examples 3 and 4 show that, compared with Examples 1 and 2, when the mass of the anti-oxidation coating is higher, although the life of the molding mold is significantly improved and the proportion of concave and convex points is significantly reduced, the anti-oxidation coating may contaminate the molding surface, resulting in poor appearance of the 3D glass products, such as dirtiness and bluishness.

[0133] 3. In Comparative Example 2, the molding surface was completely unprotected, resulting in a large number of 3D glass products with an overall appearance that was stained or bluish. In Comparative Example 5, an anti-oxidation layer was formed 2mm to 3mm beyond the molding surface, which also resulted in smudges and bluish tints on the curved edges of the 3D glass products.

[0134] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A molding die, characterized in that: The mold comprises a male mold and a female mold, wherein the raised portion of the male mold and the recessed portion of the female mold can form a cavity after the mold is closed, and the cavity surface is defined as the molding surface, the molding surface and the surface extending 2mm to 3mm along the molding surface are non-coating areas, and the other surfaces of the male mold and the female mold are coating areas; The coating area of ​​the male mold is provided with a first anti-oxidation coating, and the coating area of ​​the female mold is provided with a second anti-oxidation coating; The mass of the first anti-oxidation coating is 0.5 g / cm 2 ~0.7g / cm 2 The mass of the second anti-oxidation coating is 0.6 g / cm 2 ~1.0g / cm 2 .

2. The molding die according to claim 1, wherein: The first anti-oxidation coating and the second anti-oxidation coating are each independently selected from a silicon dioxide coating, a silicon nitride coating or a silicon carbide coating.

3. A method for preparing a forming mold, characterized in that: The following steps are involved: A punch, a punch cover, a die, and a die cover are provided. The raised portion of the punch and the recessed portion of the die can form a cavity after the molds are closed. The cavity surface is defined as the molding surface. The molding surface and the surface extending 2 mm to 3 mm along the molding surface are non-coating areas. The other surfaces of the punch and die are coating areas. placing the convex mold covering member on the convex mold to expose the coating area of ​​the convex mold; placing the die cover on the die to expose the coating area of ​​the die; A first anti-oxidation coating is formed on the coating area of ​​the convex mold until the mass of the first anti-oxidation coating is 0.5 g / cm 2 ~0.7g / cm 2 ; forming a second anti-oxidation coating in the coating area of ​​the die, until the mass of the second anti-oxidation coating is 0.6 / cm 2 ~1.0g / cm 2 , remove the male and female die covering parts.

4. The method for preparing a forming mold according to claim 3, wherein: The first anti-oxidation coating and the second anti-oxidation coating are each independently selected from a silicon dioxide coating, a silicon nitride coating or a silicon carbide coating.

5. The method for preparing a forming mold according to claim 3, wherein: Forming the first anti-oxidation coating and the second anti-oxidation coating on the coating area of ​​the male mold and the coating area of ​​the female mold respectively comprises the following steps: Applying an antioxidant solution to the coating area of ​​the male mold and the coating area of ​​the female mold; baking the antioxidant solution to form a solidified layer; The solidified layer is sintered to form a first anti-oxidation coating layer and a second anti-oxidation coating layer.

6. The method for preparing a forming mold according to claim 5, wherein: The coating method is spraying.

7. The method for preparing a forming mold according to claim 6, wherein: The process parameters of the spraying include one or more of the following: (a) Nozzle diameter is 0.8 mm ± 0.2 mm; (b) Liquid tank pressure is 0.2 ± 0.05 MPa; (c) Atomization adjustment pressure is 0.2 ± 0.05 MPa; (d) Needle height is 4.85 ± 0.2 mm; and (e) Nozzle movement speed is 1000 mm / s ± 100 mm / s.

8. The method for preparing a forming mold according to claim 5, wherein: The baking temperature is 60° C.±5° C., and / or the baking time is 1 h±0.2 h.

9. The method for preparing a forming mold according to claim 5, wherein: The sintering temperature is 600° C. to 700° C., and / or the sintering time is 30±5 min.

10. A method for forming curved glass, characterized in that: The method comprises the following steps: processing a glass substrate using the forming mold according to any one of claims 1 to 2 or the forming mold prepared by the preparation method according to any one of claims 3 to 9.

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