CN112592039B - Stress relieving process after 3D glass strengthening - Google Patents
Stress relieving process after 3D glass strengthening Download PDFInfo
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- CN112592039B CN112592039B CN202011537458.2A CN202011537458A CN112592039B CN 112592039 B CN112592039 B CN 112592039B CN 202011537458 A CN202011537458 A CN 202011537458A CN 112592039 B CN112592039 B CN 112592039B
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- glass
- annealing
- stress relieving
- strengthening
- stress
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a stress relieving process after 3D glass strengthening, which comprises the following steps: after 3D glass strengthening, annealing treatment is carried out, wherein the annealing temperature is 350-450 ℃. The invention can achieve good stress relieving effect, maintain good dimensional stability and improve the yield.
Description
Technical Field
The invention relates to the technical field of 3D glass processing, in particular to a stress relieving process after 3D glass strengthening.
Background
The 3D glass has the advantages of being light, thin, transparent, clean, fingerprint-resistant, anti-glare, hard, scratch-resistant, good in weather resistance and the like, and becomes the first choice of glass used by products such as smart phones, smart watches, tablet computers, wearable intelligent products and instrument panels.
3D glass generally needs to be subjected to strengthening treatment, the surface stress value of the glass is generated after the 3D glass is strengthened, the 3D glass needs to be subjected to performance detection such as DOL (direction of arrival), CS (circuit switching) and the like after the strengthening, and if the performance is qualified, the next step of process is carried out; if the performance is not qualified, the stress relief treatment is required.
At present, the stress relieving method is to polish glass by back polishing the glass so as to reduce the thickness of the glass to achieve the effect of stress relieving value. However, the thickness reduction of the glass is influenced by surface stress and depth, so that the glass is deformed and warped, and the defects are caused; the return polishing process flow is complicated, and the cost of material consumption, labor and the like can be increased; the glass reject ratio is high; and the turnover flow of the product is too long due to the fact that the glass is thrown back, defects are easily caused in the process, and the repair yield is reduced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a stress relieving process after 3D glass strengthening, which can achieve a good stress relieving effect, keep good dimensional stability and improve the yield.
The invention provides a stress relieving process after 3D glass strengthening, which comprises the following steps: after 3D glass strengthening, annealing treatment is carried out, wherein the annealing temperature is 350-450 ℃.
Preferably, the annealing is four-stage step annealing, the temperature from one-stage annealing to four-stage annealing is gradually reduced, and the temperature difference between two adjacent stages of annealing is 10-30 ℃.
The temperature difference between the two adjacent sections of annealing can be 10, 15, 20, 25 or 30 ℃.
Preferably, the time for each annealing stage is the same, and is 30-70 s.
The annealing time may be 30, 40, 50, 60 or 70 seconds.
Preferably, the temperature of the one-stage annealing is 380-400 ℃.
Preferably, the temperature of the four-stage annealing is 350-360 ℃.
Preferably, the annealing process is performed in a hot-bending die.
Preferably, after the annealing treatment, the steel is naturally cooled to room temperature.
The 3D glass strengthening method is a high-temperature salt bath, and the salt can be potassium salt, lithium salt and the like.
Has the advantages that:
according to the invention, a 3D glass hot bending machine and a hot bending die are matched, and annealing treatment is carried out on the glass with unqualified performance after strengthening at a proper temperature so as to release surface stress and achieve the effects of reducing stress value and relieving stress; the stress value after tempering can be effectively reduced and improved, and the product percent of pass is ensured; successfully improves the yield of the 3D glass current section and the whole process, reduces the whole manufacturing cost and creates benefits; the problems of hairbrush, polishing powder and the like caused by back polishing and the problem of increased manufacturing cost caused by back polishing can be avoided; four-stage step annealing is selected, and proper annealing temperature and time are selected, so that the dimensional stability of the 3D glass can be kept while the stress of the 3D glass after being strengthened is greatly reduced.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Processing 10 batches of 3D glass according to the same strengthening method, processing 1200 pieces of the 3D glass in each batch, detecting the performance of the strengthened 3D glass, wherein one batch of the strengthened 3D glass has unqualified performance, dividing the batch of the 3D glass into 4 groups, and performing stress relieving treatment on each group of 300 pieces according to the methods of the examples 1-3 and the comparative example 1 respectively;
wherein, the strengthening method comprises the following steps: preheating at 370 ℃ for 50min, preserving heat for 10min, then carrying out salt bath in a lithium nitrate salt bath at 420 ℃ for 5h, and then lifting 3D glass to drip salt for 10 min.
Example 1
A3D glass stress relieving process after strengthening comprises the following steps: and (3) putting the 3D glass dripped with salt for 10min into a hot bending graphite mold, respectively carrying out heat preservation annealing at 380 ℃, 370 ℃, 360 ℃ and 350 ℃ for 30s for four-section annealing treatment, then naturally cooling to room temperature, and taking out the 3D glass from the graphite mold.
Example 2
A3D glass stress relieving process after strengthening comprises the following steps: and (3) putting the 3D glass dripped with salt for 10min into a hot bending graphite mold, respectively carrying out heat preservation annealing at 400 ℃, 370 ℃, 360 ℃ and 350 ℃ for 70s for four-section annealing treatment, then naturally cooling to room temperature, and taking out the 3D glass from the graphite mold.
Example 3
A3D glass stress relieving process after strengthening comprises the following steps: and (3) putting the 3D glass dripped with salt for 10min into a hot bending graphite mold, respectively carrying out heat preservation annealing at 390 ℃, 380 ℃, 370 ℃ and 350 ℃ for 50s for four-section annealing treatment, then naturally cooling to room temperature, and taking out the 3D glass from the graphite mold.
Comparative example 1
After strengthening, the stress relief treatment is carried out by adopting a conventional polishing process.
Experiment of
The 3D glass after strengthening was stress-relieved according to the processes described in examples 1-3 and comparative example 1, and then the dimensions and the second-strength stress of the 3D glass after strengthening (i.e., before stress relief) and after stress relief were measured, and the results are shown in tables 1-2.
The 3D glass size detection method comprises the following steps: and 2, performing projection measurement by using a 2-time element instrument, detecting the appearance point position of the product through projection, and measuring the appearance sizes such as length, width and the like.
The second method for detecting the strong stress comprises the following steps: and (4) dripping stress oil on a light sensitive probe of a stress measuring instrument to detect the stress depth of the product.
TABLE 1 3D glass dimensional Change before and after stress relief
As can be seen from Table 1, after the stress relieving treatment is carried out on the 3D glass in the invention and the comparative example 1, the size of the 3D glass is not different from that before the stress relieving treatment, and the requirements are met.
TABLE 2 Secondary stress Change Condition of 3D glass before and after stress relief
As can be seen from Table 2, after the stress relieving treatment is carried out on the 3D glass in the invention and the comparative example 1, the CS of the 3D glass is obviously reduced, and the stress relieving effect is better.
The 3D glass after the strengthening treatment was subjected to tests of performance, appearance, surface condition, and the like, and the yield of each group was counted, and the results are shown in table 3.
TABLE 3 good product yield results
| Detecting items | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Number of unqualified pieces after strengthening | 300 | 300 | 300 | 300 |
| After stress relief treatment, the number of qualified slices | 285 | 283 | 286 | 195 |
| Good product rate% | 95 | 94.3 | 95.3 | 65 |
As can be seen from Table 3, the present invention has a high yield.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The stress relieving process after 3D glass strengthening is characterized by comprising the following steps of: after 3D glass is strengthened, annealing treatment is carried out, wherein the annealing temperature is 350-450 ℃;
wherein the annealing is four-stage step annealing, the temperature from one-stage annealing to four-stage annealing is gradually reduced, and the temperature difference between two adjacent stages of annealing is 10-30 ℃; the time for each annealing stage is the same and is 30-70 s.
2. The 3D glass post-strengthening stress relieving process of claim 1, wherein the temperature of the first annealing is 380-400 ℃.
3. The 3D glass post-strengthening stress relieving process as claimed in claim 1 or 2, wherein the temperature of the four-stage annealing is 350-360 ℃.
4. The 3D post-glass-strengthening stress relieving process of claim 1 or 2, wherein the annealing treatment is performed in a hot bending mold.
5. The 3D glass post-strengthening stress relieving process according to claim 1 or 2, characterized in that after annealing treatment, the glass is naturally cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011537458.2A CN112592039B (en) | 2020-12-23 | 2020-12-23 | Stress relieving process after 3D glass strengthening |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011537458.2A CN112592039B (en) | 2020-12-23 | 2020-12-23 | Stress relieving process after 3D glass strengthening |
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| CN112592039A CN112592039A (en) | 2021-04-02 |
| CN112592039B true CN112592039B (en) | 2022-04-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1539770A (en) * | 2003-10-29 | 2004-10-27 | 河南安彩高科股份有限公司 | Method for raising safe performance of pure flat glass screen of CRT |
| CN104163567A (en) * | 2014-07-31 | 2014-11-26 | 东莞劲胜精密组件股份有限公司 | Production method of tempered glass |
| CN104843977A (en) * | 2015-05-04 | 2015-08-19 | 山东华芯富创电子科技有限公司 | Method for material changing and reprocessing of touch panel tempered glass |
| EP3038990A1 (en) * | 2013-08-26 | 2016-07-06 | Corning Incorporated | Methods for localized annealing of chemically strengthened glass |
| CN110642508A (en) * | 2018-06-26 | 2020-01-03 | 江苏悦丰晶瓷科技有限公司 | Annealing process for glass tableware |
| CN111592233A (en) * | 2020-05-29 | 2020-08-28 | 醴陵旗滨电子玻璃有限公司 | Chemically strengthened glass, float glass raw sheet, preparation method and production line thereof |
| CN111705204A (en) * | 2020-07-30 | 2020-09-25 | 常熟市市南模具有限责任公司 | Oxidation heat treatment process for glass mold |
| CN112028482A (en) * | 2020-08-18 | 2020-12-04 | 衡山兄弟金属制品有限公司 | Method for manufacturing high-strength glass cup |
-
2020
- 2020-12-23 CN CN202011537458.2A patent/CN112592039B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1539770A (en) * | 2003-10-29 | 2004-10-27 | 河南安彩高科股份有限公司 | Method for raising safe performance of pure flat glass screen of CRT |
| EP3038990A1 (en) * | 2013-08-26 | 2016-07-06 | Corning Incorporated | Methods for localized annealing of chemically strengthened glass |
| CN104163567A (en) * | 2014-07-31 | 2014-11-26 | 东莞劲胜精密组件股份有限公司 | Production method of tempered glass |
| CN104843977A (en) * | 2015-05-04 | 2015-08-19 | 山东华芯富创电子科技有限公司 | Method for material changing and reprocessing of touch panel tempered glass |
| CN110642508A (en) * | 2018-06-26 | 2020-01-03 | 江苏悦丰晶瓷科技有限公司 | Annealing process for glass tableware |
| CN111592233A (en) * | 2020-05-29 | 2020-08-28 | 醴陵旗滨电子玻璃有限公司 | Chemically strengthened glass, float glass raw sheet, preparation method and production line thereof |
| CN111705204A (en) * | 2020-07-30 | 2020-09-25 | 常熟市市南模具有限责任公司 | Oxidation heat treatment process for glass mold |
| CN112028482A (en) * | 2020-08-18 | 2020-12-04 | 衡山兄弟金属制品有限公司 | Method for manufacturing high-strength glass cup |
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