CN117735816A - Polishing-free hot bending process for curved glass - Google Patents
Polishing-free hot bending process for curved glass Download PDFInfo
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- CN117735816A CN117735816A CN202311618723.3A CN202311618723A CN117735816A CN 117735816 A CN117735816 A CN 117735816A CN 202311618723 A CN202311618723 A CN 202311618723A CN 117735816 A CN117735816 A CN 117735816A
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Abstract
本公开提供一种曲面玻璃免抛光热弯工艺，其包括如下步骤：(1)对石墨热弯磨具喷涂陶瓷粉浆料，其中陶瓷粉浆料采用陶瓷粉与无水酒精混合形成陶瓷粉浆料，陶瓷粉与无水酒精按重量比3:1至1:1的比例进行混合；(2)对喷涂后的石墨热弯模具进行烘烤，使得石墨热弯模具与陶瓷粉浆料粘结固化；(3)采用固化后的石墨热弯模具进行玻璃坯件进行热弯作业，以形成曲面玻璃。无需进行后续的抛光修补工艺，减少了工序，避免了抛光修复工艺导致的二次不良废品率，并消除了现有技术抛光修复导致的直接成本和间接成本，有效地确保了曲面玻璃的产品质量，并降低了曲面玻璃的生产成本。
The present disclosure provides a polishing-free hot-bending process for curved glass, which includes the following steps: (1) spraying ceramic powder slurry on a graphite hot-bending abrasive tool, wherein the ceramic powder slurry is mixed with ceramic powder and absolute alcohol to form a ceramic slurry. Material, ceramic powder and anhydrous alcohol are mixed in a weight ratio of 3:1 to 1:1; (2) Bake the sprayed graphite hot bending mold to make the graphite hot bending mold bond with the ceramic powder slurry Curing; (3) Use the cured graphite hot bending mold to hot bend the glass blank to form curved glass. There is no need to perform subsequent polishing and repair processes, which reduces the number of processes, avoids the secondary defective product rate caused by the polishing and repair process, and eliminates the direct and indirect costs caused by polishing and repairing in the existing technology, effectively ensuring the product quality of curved glass. , and reduce the production cost of curved glass.
Description
Technical Field
The disclosure relates to the technical field of glass processing, in particular to a polishing-free hot bending process for curved glass.
Background
Curved glass is increasingly used, for example, in mobile phones, vehicle devices, 2D curved glass and 3D curved glass are commonly used.
The prior manufacturing process of the curved glass mainly comprises the following steps: CNC trimming (namely numerical control machine trimming) is carried out on the glass blank, then a graphite die is adopted for hot bending operation, and then double-sided polishing and other processes are carried out on the formed curved glass.
However, in the curved glass processing technology in the prior art, the processing cost of the curved glass is relatively high, and the curved glass has a plurality of problems, which are specifically expressed as follows:
firstly, after the graphite mold is heated and bent, the surface of the 3D curved glass has the defects of mold printing, indentation and the like, the surface is required to be repaired by polishing, after the single-sided repair is finished, the next surface is required to be switched for continuous repair, and the working procedure is complicated.
However, in the polishing repair process of the curved glass, secondary defects such as scratches and breakage are often caused, so that more waste products are generated in the curved glass, and more consumables such as polishing brushes, polishing powder and concave/convex polishing jigs are consumed in the polishing repair process, so that the manufacturing cost of the curved glass is high.
Secondly, in the curved glass processing technology in the prior art, the abrasion rate of the graphite mold is very high, the glass blank of about 500 sheets is processed to reach the scrapping stage, and the cost of the graphite mold is too high.
In view of this, there is a need to devise a more superior curved glass processing process that obviates or mitigates one or more of the above-described disadvantages of the prior art.
Disclosure of Invention
The technical problem to be solved by the present disclosure is to provide a polishing-free hot bending process for curved glass, which can improve the surface finish quality of the curved glass, and the like, without performing a subsequent polishing process for the curved glass.
In order to solve the above technical problems, an embodiment of the present disclosure provides a polishing-free hot bending process for curved glass, which includes the following steps: (1) Spraying ceramic powder slurry on the graphite hot-bending grinding tool, wherein the ceramic powder slurry is formed by mixing ceramic powder and absolute ethyl alcohol, and the ceramic powder and the absolute ethyl alcohol are mixed according to the weight ratio of 3:1 to 1:1; (2) Baking the sprayed graphite hot-bending die to bond and solidify the graphite hot-bending die and the ceramic powder slurry; (3) And performing hot bending operation on the glass blank by adopting the cured graphite hot bending die to form curved glass.
In some embodiments, the ceramic powder comprises the following components in weight percent: 35-60% of silicon carbide, 15-43% of silicon powder, 3-10% of alumina, 4-15% of boron carbide and 3-4% of combustion improver zirconium oxide.
In some embodiments, prior to step (1), further comprising finishing the cavity of the graphite hot bend grinding tool.
In some embodiments, the finish treatment is a polishing process treatment of the cavity of a graphite hot-bending die.
In some embodiments, in step (2), the sprayed graphite hot-bending die is baked at a temperature of 300 ℃ to 500 ℃ for 20 to 40 minutes.
In some embodiments, the sprayed graphite hot-bending die is baked at a temperature of 400 ℃ for 30 minutes.
In some embodiments, in step (3), the hot bending operation is performed at a temperature of 650 ℃ to 850 ℃ for 20 to 40 minutes, and the cavity of the graphite hot bending grinding tool is coated with the paraffin doped with carbon black powder after baking and curing.
In some embodiments, the heat staking operation is performed at a temperature of 750 ℃ for 30 minutes.
In some embodiments, further comprising inspecting the surface finish of the curved glass after the hot bending operation.
In some embodiments, the method further comprises immersing and cleaning the graphite hot bending die after 150-250 curved glass sheets are processed by the graphite hot bending die, so as to recycle the graphite hot bending die after re-spraying ceramic powder slurry and baking and curing.
In some embodiments, the ceramic powder slurry is doped with a glass powder of the same composition as the glass blank to be processed, wherein the parts by weight of the glass powder is 1/50-1/30 of the parts by weight of the ceramic powder.
Through the technical scheme, the polishing-free hot bending process for the curved glass provided by the disclosure is characterized in that the cured ceramic powder is originally bonded on the graphite hot bending die, and the cured graphite hot bending die is adopted to carry out hot bending operation on the glass blank. The polishing-free hot bending process of the curved glass has been proved in practical production, the processed curved glass has good appearance effect, smooth surface and 98.2 percent of finished product qualification rate, the curved glass with the quality does not need to carry out subsequent polishing repair process, the procedures are reduced, the secondary defective rejection rate caused by the polishing repair process is avoided, the direct cost and the indirect cost caused by the polishing repair in the prior art are eliminated, the product quality of the curved glass is effectively ensured, and the production cost of the curved glass is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a block diagram of steps of a polishing-free thermal bending process for curved glass in accordance with an embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the disclosure and not to limit the scope of the disclosure, which may be embodied in many different forms and not limited to the specific embodiments disclosed herein, but rather to include all technical solutions falling within the scope of the claims.
The present disclosure provides these embodiments in order to make the present disclosure thorough and complete, and fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.
In the description of the present disclosure, unless otherwise indicated, the meaning of "plurality" is greater than or equal to two; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present disclosure. When the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
Furthermore, the use of the terms first, second, and the like in this disclosure do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements.
It should also be noted that, in the description of the present disclosure, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present disclosure may be understood as appropriate by those of ordinary skill in the art. When a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device.
All terms used in the present disclosure have the same meaning as understood by one of ordinary skill in the art to which the present disclosure pertains, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
Examples
Referring to fig. 1, the invention provides a polishing-free hot bending process for curved glass, which is characterized by comprising the following steps:
(1) Spraying ceramic powder slurry on the graphite hot-bending grinding tool, wherein the ceramic powder slurry is formed by mixing ceramic powder and absolute ethyl alcohol, and the ceramic powder and the absolute ethyl alcohol are mixed according to the weight ratio of 3:1 to 1:1;
(2) Baking the sprayed graphite hot-bending die to bond and solidify the graphite hot-bending die and the ceramic powder slurry;
(3) And performing hot bending operation on the glass blank by adopting the cured graphite hot bending die to form curved glass.
Through the polishing-free hot bending process of the curved glass of the basic embodiment, the ceramic powder is originally bonded and solidified on the graphite hot bending die, and the glass blank is subjected to hot bending operation by adopting the solidified graphite hot bending die, wherein the unique technical points are that the ceramic powder slurry is formed by mixing absolute alcohol with the ceramic powder, and the unique mixing mode is verified by a large number of actual products, and the ceramic powder slurry cannot be effectively solidified and adhered on the graphite hot bending die due to the adoption of water or other solvents. The polishing-free hot bending process of the curved glass has been proved in practical production, the processed curved glass has good appearance effect, smooth surface and 98.2% of finished product qualification rate, the curved glass with the quality does not need to carry out subsequent polishing repair process, procedures are reduced, the polishing-free technical effect is realized, the secondary defective rejection rate caused by the polishing repair process is avoided, the direct cost and the indirect cost caused by the polishing repair in the prior art are eliminated, the product quality of the curved glass is effectively ensured, and the production cost of the curved glass is reduced.
In some embodiments, the ceramic powder comprises the following components in weight percent: 35-60% of silicon carbide, 15-43% of silicon powder, 3-10% of alumina, 4-15% of boron carbide and 3-4% of combustion improver zirconium oxide. Although the ceramic powder materials commercially available on the market can basically achieve the technical effects of the disclosure, the ceramic powder formulation of the embodiment belongs to a unique special formulation developed by the technical group of the disclosure aiming at the graphite hot bending die coating process, and particularly, the unique formulation is adopted by the auxiliary materials of aluminum oxide and boron carbide, so that the toughness and certain plasticity of the ceramic powder slurry layer can be effectively improved, micropores of the cured ceramic powder slurry layer can be effectively reduced, the processing quality of a finished product is higher, and the smoothness of a glass plate is higher.
In some embodiments, prior to step (1), finishing the cavity of the graphite hot bend grinding tool may be included. The hot bending die is made of graphite, the heat conduction performance of the hot bending die is relatively close to that of glass, and in order to prevent processing marks existing in the graphite die from affecting the processing quality of the subsequent curved glass, surface impurities such as knife mark, particle points and the like existing in the processing process of the graphite die can be effectively eliminated through the finish processing of the cavity. In other embodiments, a particular finish treatment may employ a polishing process, such as polishing the cavity of a graphite mold with sandpaper, and typically a fine polishing process may employ 5000# sandpaper.
To better bond and cure the sprayed ceramic powder slurry to the graphite hot-bending mold, the bond may be enhanced by baking the sprayed graphite hot-bending mold at a temperature of 300-500 ℃ for 20-40 minutes, and coating the cavity of the graphite hot-bending mold with paraffin doped with carbon black powder after baking and curing. The unique paraffin coating process can effectively further improve the processing quality of the glass cover plate, is especially critical to improving the finish quality of the glass cover plate and avoiding invisible scratches of naked eyes, and because the temperature in hot bending operation is up to 650-850 ℃, paraffin doped with carbon black powder is melted first to become liquid, and can permeate carbon black powder into surface micropores possibly existing in a ceramic powder slurry curing layer, carbon dioxide and water formed by burning the paraffin are evaporated along with the rise of the temperature, carbide formed by burning the carbon black powder seals micropores, so that the micropores are prevented from forming slight scratches on the surface of the glass cover plate, and the finish quality of a glass cover plate finished product is further improved.
In some embodiments, the sprayed graphite hot-bending mold may be baked at a temperature of 400 ℃ for 30 minutes. The curing time and the curing temperature are more beneficial to the fusion, the bonding and the curing of the ceramic powder and the graphite hot bending die.
In order to avoid the graphite hot bending die itself being damaged excessively by use and to create conditions for the subsequent recycling of the die, in some embodiments, the use temperature and the use time in step (3) may be controlled, and in particular, the hot bending operation may be performed at a temperature of 650-850 ℃ for 20-40 minutes.
Depending on the actual production test, in some embodiments, the hot bending operation may be performed at a temperature of 750 ℃ for 30 minutes. The temperature and the service time have the least damage to the graphite hot bending die, and are also most beneficial to maintaining the service life of the graphite hot bending die.
In some embodiments, to prevent the polishing-free hot bending process of the curved glass of the present disclosure from having individual unexpected rejects, the surface finish of the curved glass may be inspected after the hot bending operation. Therefore, once individual unqualified products are found, the reasons can be searched in time, the processing technological parameters can be adjusted, and the unqualified products are prevented from being mixed into qualified products.
In some embodiments, the method further comprises immersing and cleaning the graphite hot bending die after 150-250 curved glass sheets are processed by the graphite hot bending die, so as to recycle the graphite hot bending die after re-spraying ceramic powder slurry and baking and curing. Thus, due to the embodiment of the disclosure, the service time of the graphite hot bending die is precisely controlled, the graphite hot bending die is basically free of damage, and the graphite hot bending die can be further sprayed with ceramic powder and cured and baked by soaking and cleaning the graphite hot bending die, so that the graphite hot bending die can be recycled. Through practical tests, the recycling can prolong the service life of the graphite hot bending die by 4 times, namely, the original die is scrapped when producing 500 pieces of curved glass, and each die can produce 2000 pieces of curved glass at present.
In some embodiments, the sprayed ceramic powder slurry may be doped with a glass powder of the same composition as the glass blank to be processed, wherein the parts by weight of the glass powder may be 1/50-1/30 of the parts by weight of the ceramic powder. The process characteristics are improved process formula through a large amount of researches and experiments, in actual production, although the qualification rate of the finished product reaches 98.2%, occasionally, unqualified products of curved glass still exist, and researches show that although graphite materials are similar to the thermal conductivity of glass, certain subtle differences exist, after the surface of a graphite hot bending die is bonded with solidified ceramic powder, certain differences exist in thermal deformation, glass powder with the same components as glass blanks to be processed can be doped in sprayed ceramic powder slurry through a large amount of improvement trial production, wherein the weight part of the glass powder can be 1/50-1/30 of the weight part of the ceramic powder, the qualification rate of the finished product can be obviously and effectively further improved, and the qualification rate of the finished product reaches 99.3% through the technical advantages of the scheme of the invention are further improved through the technical improvement.
Various embodiments of the disclosed technology have been described above by way of some examples, one relatively comprehensive example being described below with reference to the actual production process.
In this relatively comprehensive embodiment, the hot bending mold is made of graphite, and the thermal conductivity of the graphite is close to that of glass, so that the curved glass is more beneficial to processing, and the overall processing process comprises: firstly, polishing a cavity of a graphite hot-bending die by using 5000# abrasive paper, and polishing surface impurities such as knife marks, particle points and the like in the processing process of the graphite hot-bending die; secondly, uniformly spraying the inner surface and the outer surface of a graphite hot bending die by using the prepared ceramic powder slurry; thirdly, baking the graphite hot-bending die at 400 ℃ for 30 minutes (namely, baking to solidify the ceramic powder slurry) after spraying the ceramic powder slurry, so that the graphite hot-bending die and the ceramic powder are fused, the adhesive force is increased, the graphite hot-bending die is not easy to fall off in the use process, and the solidification protection effect is achieved; fourthly, after the baking is finished, putting the graphite hot bending die into a curved glass product for processing, and adopting the graphite hot bending die to carry out hot bending operation for 30 minutes at the temperature of 750 ℃ so as to avoid overlong continuous hot bending operation and damage to the graphite hot bending die; fifthly, after the single curved glass hot bending operation is finished, checking the surface of the curved glass to confirm the appearance effects such as surface finish and the like; sixth, after 200 curved glass sheets are processed by the graphite hot bending die, the graphite hot bending die is soaked and cleaned by adopting a soaking liquid, the soaking liquid can be used for cleaning commonly, ceramic powder slurry spraying is carried out on the graphite hot bending die again after soaking is finished, baking and curing are carried out, so that the graphite hot bending die can be recycled, and through testing, the original service life of the graphite hot bending die only can be used for processing 500 curved glass sheets, and the service life of the graphite hot bending die can be prolonged to 2000 curved glass sheets.
Through the description of the technical scheme, the curved glass polishing-free hot bending process disclosed by the disclosure does not need subsequent polishing repair for the curved glass formed by processing, achieves the technical effect of polishing-free, reduces polishing procedures for the curved glass, can save consumables such as polishing brushes, polishing jigs, polishing liquid and the like, reduces manufacturing cost, effectively avoids secondary defects such as scratches, damages and the like caused by the curved glass in the polishing process, and improves the yield of products.
In addition, the technical scheme of the present disclosure also promotes graphite hot bending mould life, and it can double the promotion life, reduces graphite mould surface abrasion condition.
Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict.
Claims (11)
1. The polishing-free hot bending process for the curved glass is characterized by comprising the following steps of:
(1) Spraying ceramic powder slurry on the graphite hot-bending grinding tool, wherein the ceramic powder slurry is formed by mixing ceramic powder with absolute ethyl alcohol, and the ceramic powder and the absolute ethyl alcohol are mixed according to the weight ratio of 3:1 to 1:1;
(2) Baking the sprayed graphite hot-bending die to bond and solidify the graphite hot-bending die and the ceramic powder slurry;
(3) And performing hot bending operation on the glass blank by adopting the cured graphite hot bending die to form curved glass.
2. The polishing-free hot bending process of curved glass according to claim 1, wherein the ceramic powder comprises the following components in percentage by weight: 35-60% of silicon carbide, 15-43% of silicon powder, 3-10% of alumina, 4-15% of boron carbide and 3-4% of combustion improver zirconium oxide.
3. The polishing-free thermal bending process of curved glass according to claim 1, further comprising, prior to step (1), finishing the cavity of the graphite thermal bending abrasive tool.
4. The polishing-free thermal bending process of curved glass according to claim 4, wherein the finish treatment is a polishing process treatment of the cavity of the graphite thermal bending die.
5. The polishing-free hot bending process for curved glass according to claim 1, wherein in the step (2), the sprayed graphite hot bending mold is baked at a temperature of 300 ℃ to 500 ℃ for 20 to 40 minutes, and the cavity of the graphite hot bending grinding tool is coated with paraffin doped with carbon black after baking and curing.
6. The polishing-free thermal bending process of curved glass according to claim 5, wherein the sprayed graphite thermal bending mold is baked at 400 ℃ for 30 minutes.
7. The polishing-free hot bending process for curved glass according to claim 1, wherein in said step (3), the hot bending operation is performed at a temperature of 650 ℃ to 850 ℃ for 20 to 40 minutes.
8. The polishing-free thermal bending process of curved glass according to claim 7, wherein the thermal bending operation is performed at a temperature of 750 ℃ for 30 minutes.
9. The polishing-free thermal bending process of curved glass according to claim 1, further comprising inspecting the surface finish of the curved glass after the thermal bending operation.
10. The polishing-free thermal bending process of curved glass according to any one of claims 1 to 9, further comprising immersing and cleaning the graphite thermal bending die after processing 150-250 curved glass sheets using the graphite thermal bending die to recycle the graphite thermal bending die after re-spraying the ceramic powder slurry and baking for curing.
11. The curved glass polishing-free hot bending process according to any one of claims 1 to 9, wherein the ceramic powder slurry is doped with glass powder having the same composition as the glass blank to be processed, wherein the glass powder is 1/50 to 1/30 by weight of the ceramic powder.
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| CN202311618723.3A CN117735816A (en) | 2023-11-29 | 2023-11-29 | Polishing-free hot bending process for curved glass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311618723.3A CN117735816A (en) | 2023-11-29 | 2023-11-29 | Polishing-free hot bending process for curved glass |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256168A (en) * | 1996-03-22 | 1997-09-30 | Laser Noshuku Gijutsu Kenkyu Kumiai | Coating method on graphite |
| US20180327322A1 (en) * | 2015-11-11 | 2018-11-15 | Nippon Carbon Co., Ltd. | Coating formed on graphite substrate and method for producing the same |
| CN113185100A (en) * | 2021-04-30 | 2021-07-30 | 东莞市瑞立达玻璃盖板科技股份有限公司 | Mold antioxidant and hot bending forming process of glass cover plate |
| CN116495981A (en) * | 2022-12-09 | 2023-07-28 | 维达力科技股份有限公司 | Forming mold, preparation method thereof, and forming method of curved glass |
-
2023
- 2023-11-29 CN CN202311618723.3A patent/CN117735816A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256168A (en) * | 1996-03-22 | 1997-09-30 | Laser Noshuku Gijutsu Kenkyu Kumiai | Coating method on graphite |
| US20180327322A1 (en) * | 2015-11-11 | 2018-11-15 | Nippon Carbon Co., Ltd. | Coating formed on graphite substrate and method for producing the same |
| CN113185100A (en) * | 2021-04-30 | 2021-07-30 | 东莞市瑞立达玻璃盖板科技股份有限公司 | Mold antioxidant and hot bending forming process of glass cover plate |
| CN116495981A (en) * | 2022-12-09 | 2023-07-28 | 维达力科技股份有限公司 | Forming mold, preparation method thereof, and forming method of curved glass |
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