Method for enabling glass bending radian R to be smaller than or equal to 1.5 mm

Abstract

The invention relates to the technical field of glass processing, in particular to a method for achieving the bending radian R of glass smaller than or equal to 1.5 mm. A raw material is evenly thinned through hydrofluoric acid etching, the inherent brittleness of the glass is reduced, a material basis is provided for follow-up micro-radian bending, film covering protection is adopted in the whole process of cutting and beveling links, and the bending radian R of the glass is smaller than or equal to 1.5 mm. The method comprises the following steps of: forming a preset stress guide line in a bending area by customizing a cutter and accurately controlling the cutting depth, and finally performing chemical strengthening treatment, so that the glass strength is improved, the controllable micro-etching effect is utilized, and the yield of the glass is improved. According to the method disclosed by the invention, micro-defects of grooves and edges are rounded, a stress fracture source during bending is eliminated, finally, the overall strength and the structural stability of the glass are improved through a tempering process, and by adopting the method, the glass is ensured to be bent with extremely small radian under high yield.

Description

Technical Field

[0001] This invention relates to the field of glass processing technology, and in particular to a method for achieving a glass bending radius R of less than or equal to 1.5 mm. Background Technology

[0002] With the rapid development of industries such as consumer electronics, smart homes, and automotive dashboards, higher requirements are being placed on the appearance and shape of cover glass, leading to a growing demand for 2.5D, 3D, and even multi-bent glass components. The key to achieving these shapes lies in glass bending technology, and the size of the bending radius (R angle) directly determines the visual aesthetics and design freedom of the product.

[0003] However, existing glass bending processes suffer from problems such as high breakage rates and difficulty in achieving extremely small bending radius (e.g., R≤1.5mm). This makes it difficult to meet such high-precision bending requirements without special processing of the conventional glass surface. Summary of the Invention

[0004] The purpose of this invention is to provide a method for achieving a glass bending radius R of less than or equal to 1.5 mm, thereby solving the problems of high breakage rate and difficulty in achieving extremely small bending radius in existing glass bending processes.

[0005] To achieve the above objective, the present invention provides a method for achieving a glass bending radius R of less than or equal to 1.5 mm, the method comprising the following steps: Raw material inspection: The surface quality of the glass raw material is inspected using a high-intensity lamp; Etching thinning: The inspected glass raw material is thinned to the target thickness using hydrofluoric acid etching solution, and then cleaned and dried to obtain the thinned glass raw material; Coating and precision cutting: After the thinned glass is coated, it is cut into glass sheets according to the preset size using a cutting wheel equipment; Beveling: Beveling the edges of the glass sheet after cutting; Preliminary cleaning and inspection: After removing the protective film from the glass slide after beveling, the glass slide is cleaned, dried, and subjected to intermediate inspection to complete the preliminary inspection of the glass slide; Precision grooving: Using a precision scribing machine and customized cutting tools, grooving is performed on the processing surface of the bending area of ​​the glass sheet after preliminary inspection; Chemical strengthening: Chemical strengthening treatment is applied to the grooved glass slides; Tempering treatment: Chemical tempering treatment is performed on the chemically strengthened glass sheet; Final cleaning and packaging: The tempered glass sheets are cleaned, dried, inspected, and then packaged and shipped.

[0006] In the step of "etching and thinning", when cleaning the thinned glass material, it is necessary to perform 3 alkaline cleanings and 4 overflow pure water washes in sequence. When drying the cleaned glass material, it needs to be dried at 150℃ for 10-15 minutes; Furthermore, after the glass raw material is dried, its surface quality must be inspected again using a strong light.

[0007] In the step of "coating and precision cutting", when coating the glass raw material, a coating machine is used to coat one side, and the protective film is an electrostatic film; when cutting the glass raw material, a 115° cutting wheel is selected and the cutting operation is performed with a pressure of 0.75V.

[0008] In the step of "edge beveling", the glass sheet needs to be protected with a double-sided UV film before beveling. During the beveling process, a diamond grinding head is used and the process is carried out under vacuum adsorption. The specific conditions for beveling are: spindle speed of 30,000 rpm, vacuum negative pressure of 0.75-0.9 MPa, and cutting fluid concentration of 30%.

[0009] The specific steps of the "preliminary cleaning and inspection" are as follows: use a 365nm UV lamp to irradiate the glass slide after edge beveling for 3-5 minutes to remove the UV film, then use 3 alkaline cleaning agents in conjunction with ultrasonic cleaning, then rinse with overflow water 4 times, and dry at 150℃ for 10-15 minutes. After drying, inspect the condition of the glass slide and pick out defective products.

[0010] The specific content of the step "precision grooving" is as follows: a precision dicing machine is used with a customized tool and a special metal jig ring to attach the UV film to the glass slide to groove. After grooving, the UV film is removed. The tool is a customized tool, the spindle speed is 30,000 rpm, and the feed rate is 2 mm / s.

[0011] The specific content of the step "chemical strengthening" is as follows: the glass slide is strengthened with a chemical strengthening solution, and the bubbling function is turned on to ensure uniformity, and the etching amount is controlled at 10µm.

[0012] In the "tempering process", after the glass sheet is chemically tempered, it needs to be desalted using hot water.

[0013] The specific details of the "Final Cleaning and Packaging" step are as follows: the final cleaning uses 3 alkaline detergents and 4 overflow water washes, without turning on the ultrasonic function. After cleaning, the product is dried and inspected. Finally, it is packaged and shipped using a combination of thick glass and tissue paper.

[0014] This invention discloses a method for achieving a glass bending radius R of less than or equal to 1.5 mm. The method involves uniformly thinning the raw material using hydrofluoric acid etching, reducing the inherent brittleness of the glass and providing a material basis for subsequent micro-radius bending. Furthermore, a protective coating is used throughout the blanking and beveling processes, and beveling parameters are optimized to avoid micro-cracks and edge chipping caused by stress concentration, thus reducing the initial breakage rate. Simultaneously, customized cutting tools and precisely controlled cutting depth create a pre-defined stress guide line in the bending area. Finally, chemical strengthening treatment enhances the glass's strength while using controllable micro-etching to round off micro-defects in the grooves and edges, eliminating stress fracture sources during bending. Finally, a tempering process improves the overall strength and structural stability of the glass. Using this method, glass bending with minimal radius is achieved with a high yield. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of the steps of the method provided by the present invention for achieving a glass bending radius R of less than or equal to 1.5 mm. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] Please see Figure 1 This invention provides a method for achieving a glass bending radius R of less than or equal to 1.5 mm, the method comprising the following steps: S1. Raw material inspection: Surface quality inspection of glass raw materials using a high-intensity lamp; S2, Etching and Thinning: The inspected glass material is thinned to the target thickness using hydrofluoric acid etching solution, and then cleaned and dried to obtain the thinned glass material. S3. Coating and Precision Cutting: After the thinned glass is coated, it is cut into glass sheets according to the preset size using a cutting wheel equipment. S4. Edge beveling: Beveling the edges of the glass sheet after cutting. S5. Preliminary cleaning and inspection: After removing the protective film from the glass sheet after beveling, the glass sheet is cleaned, dried, and inspected in the intermediate stage to complete the preliminary inspection of the glass sheet. S6. Precision grooving: Using a precision scribing machine and customized cutting tools, grooving is performed on the processing surface of the bending area of ​​the glass sheet after preliminary inspection. S7. Chemical strengthening: Chemical strengthening treatment is carried out on the grooved glass slide; S8. Tempering treatment: Chemical tempering treatment is performed on the chemically strengthened glass sheet; S9. Final cleaning and packaging: The tempered glass sheets are cleaned, dried, inspected, and then packaged and shipped.

[0019] In this embodiment, hydrofluoric acid etching is used to uniformly thin the raw material, reducing the inherent brittleness of the glass and providing a material basis for subsequent micro-arc bending. Furthermore, a protective coating is used throughout the blanking and beveling processes, and beveling parameters are optimized to avoid micro-cracks and edge chipping caused by stress concentration, thus reducing the initial breakage rate. Simultaneously, customized tools and precisely controlled cutting depths create pre-defined stress guide lines in the bending area. Finally, chemical strengthening treatment enhances the glass's strength while controlling micro-etching to round out micro-defects in the grooves and edges, eliminating stress fracture sources during bending. Finally, tempering improves the overall strength and structural stability of the glass. Using the above method for glass bending ensures that the glass can achieve extremely small-arc bending with a high yield.

[0020] Furthermore, in the step of "etching and thinning", when cleaning the thinned glass material, it is necessary to perform 3 alkaline cleanings and 4 overflow pure water washes in sequence. When drying the cleaned glass material, it needs to be dried at 150℃ for 10-15 minutes; Furthermore, after the glass raw material is dried, its surface quality must be inspected again using a strong light.

[0021] Furthermore, in the step of "coating and precision cutting", when coating the glass raw material, a coating machine is used to coat one side, and the protective film is an electrostatic film; when cutting the glass raw material, a 115° cutting wheel is selected and the cutting operation is performed with a pressure of 0.75V.

[0022] Furthermore, in the step of "edge beveling", the glass sheet needs to be protected with a double-sided UV film before beveling. During the beveling process, a diamond grinding head is used and the process is carried out under vacuum adsorption fixation. The specific conditions for edge beveling are: spindle speed of 30,000 rpm, vacuum negative pressure of 0.75-0.9 MPa, and cutting fluid concentration of 30%.

[0023] Furthermore, the specific content of the step "preliminary cleaning and inspection" is as follows: use a 365nm UV lamp to irradiate the glass slide after edge beveling for 3-5 minutes to remove the UV film, then use 3 alkaline cleaning agents in conjunction with ultrasonic cleaning, then rinse with overflow water 4 times, and dry at 150℃ for 10-15 minutes. After drying, inspect the condition of the glass slide and pick out defective products.

[0024] Furthermore, the specific content of the step "precision grooving" is as follows: a precision dicing machine is used with a customized tool and a special metal jig ring to attach the UV film to the glass slide to groove. After grooving is completed, the UV film is removed. The tool is a customized tool, the spindle speed is 30,000 rpm, and the feed rate is 2 mm / s.

[0025] Furthermore, the specific content of the "chemical strengthening" step is as follows: the glass slide is strengthened with a chemical strengthening solution, and the bubbling function is turned on to ensure uniformity, with the etching amount controlled at 10µm.

[0026] Furthermore, in the "tempering" step, after the glass sheet undergoes chemical tempering, it needs to be desalted using hot water.

[0027] Furthermore, the specific details of the "final cleaning and packaging" step are as follows: the final cleaning uses 3 alkaline detergents and 4 overflow water washes, and the ultrasonic function is not turned on. After cleaning, the product is dried and inspected. Finally, it is packaged and shipped using a combination of thick glass and tissue paper.

[0028] In this embodiment, the method for achieving a glass bending radius R less than or equal to 1.5mm, using a 500*500mm glass raw material with a thickness of 0.5mm as an example, and cutting it into an 80*130mm product with a thickness of 0.2mm, with a groove width of 1000-6000um and a groove depth of 0.15mm, to achieve a bending radius R ≤ 1.5mm, is detailed as follows: 1. Inspect the raw materials by using a strong light to check the surface and ensure that there are no obvious scratches, chipped edges, broken pieces or other quality problems.

[0029] 2. Using an etching line, the thickness of the raw material is reduced by 0.5mm to the customer's required 0.2mm by reacting hydrofluoric acid with the glass (etching line process: water washing - etching - surface treatment - water washing - water washing). After that, it is cleaned and dried (3 alkaline washes + 4 overflow pure water washes + oven at 150℃ for 10-15 minutes). The quality of the material after thinning needs to be inspected again (visually free of scratches, dirt, chipping, broken pieces, etc.).

[0030] 3. Use a laminating machine (the laminating machine has upper and lower rollers; select UV film on the upper roller and electrostatic film on the lower roller. Pull out the electrostatic film and adhere it to the UV film. Place the product on the electrostatic film, press the forward button, and the laminating machine will move forward) to apply electrostatic film to one side of the product to prevent scratches on the unprocessed side; make a cutting drawing according to the customer-specified dimensions, select a 115° cutting wheel, and perform the cutting operation with a pressure of 0.75V (with the laminated side facing down, as mentioned above to prevent scratches).

[0031] 4. Double-sided UV film coating (only one side was coated above; place the coated side down with the electrostatic film, and the uncoated side up, repeating the coating process above) to prevent product scratches. Clean the base with an air gun. Place the product that needs to bevel its edges on the base. After vacuum adsorption, start the program, using vacuum pressure (negative pressure 0.75-0.9Mpa), spindle speed 30000rpm, cutting fluid concentration 30%, and diamond grinding head grit 380 / 800.

[0032] 5. Irradiate with a 365nm UV lamp for 3-5 minutes to remove the UV film. Then, use 3 alkaline detergents (5% concentration, 50℃) + 4 overflow water rinses, combined with an up-and-down agitation system and ultrasonic waves, to clean the product surface. After drying, inspect the product condition and remove defective products (cleaning time is 3-5 minutes per detergent rinse, remove the cleaning rack and place it in pure water for 3-5 minutes per pure water rinse, and after completion, use an oven at 150℃ for 10-15 minutes; the inspection process is the same as above, using a strong light for observation).

[0033] 6. Use a precision dicing machine with a 58*1.0*40B blade (outer diameter 58mm, thickness 1mm, inner diameter 40mm; blade customization is available). The spindle speed is 30,000 rpm, and the feed rate is 2mm / s. A special metal fixture ring is used to adhere the UV film. The product is placed on the UV film, and the metal fixture ring is held in place by a vacuum table. The cutting depth is controlled by the film thickness plus the product thickness. After cutting, remove the UV film.

[0034] 7. Use a strong chemical solution and turn on the bubbling function to ensure uniform etching. Etch 10µm to "round out" any chipping or microcracks in the glass.

[0035] 8. The tempering process involves gradual heating and cooling, with a cooling time of no less than 30 minutes. The preheating time is 3600 seconds, the tempering time is 1000 seconds, the tempering temperature is 375℃, the annealing time is 1800 seconds, and the temperature is cooled to room temperature. The salt is removed by hot water at 60℃.

[0036] 9. Use 3 alkaline detergents (concentration 5%, temperature 50℃) + 4 overflow water washes (cleaning process is the same as above) with the up and down agitation system, without ultrasonic function, to clean the product surface; after drying, inspect the product condition and pick out defective products.

[0037] 10. Packaging is done using thick glass and tissue paper before shipping to customers.

[0038] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method of achieving a bend radius R of glass of 1.5 mm or less, characterized in that, The method comprises the following steps: Raw material inspection: surface quality inspection of the glass raw material by a strong light lamp; Etching thinning: the glass raw material after inspection is thinned to the target thickness by a hydrofluoric acid etching solution, and then cleaned and dried to obtain the thinned glass raw material; Film coating and precise cutting: after the thinned glass is coated with a film, the glass is cut according to the preset size by using a cutter wheel cutting device to obtain a glass sheet; Edge processing: the edges of the glass sheet after cutting are processed by edge turning; Preliminary cleaning and inspection: after removing the protective film of the glass sheet after edge processing, the glass sheet is cleaned, dried and inspected to complete the preliminary inspection of the glass sheet; Precise slotting: a precision scribe machine is used to select a customized cutter to slot the machining surface of the bending area of the glass sheet after preliminary inspection; Chemical strengthening: the glass sheet after slotting is subjected to chemical strengthening treatment; Tempering treatment: the glass sheet after chemical strengthening is subjected to chemical tempering treatment; Final cleaning and packaging: the glass sheet after tempering is cleaned, dried, inspected and packaged for delivery.

2. The method of claim 1, wherein, in the step of etching thinning, when the thinned glass raw material is cleaned, three alkaline cleaning and four overflow water washing are sequentially performed; when the cleaned glass raw material is dried, it is dried at 150°C for 10-15 minutes; and after the glass raw material is dried, the surface quality of the glass raw material is again inspected by a strong light lamp.

3. The method of claim 2, wherein, in the step of film coating and precise cutting, when the glass raw material is coated with a film, a film coating machine is used for single-sided film coating, and the protective film is an electrostatic film; when the glass raw material is cut, a 115° cutter wheel is selected and cutting is performed at a pressure of 0.75V.

4. The method of claim 3, wherein, in the step of edge processing, before the glass sheet is edge processed, the glass sheet is protected by double-sided UV film coating; during the edge processing of the glass sheet, a diamond grinding head is used under vacuum adsorption and fixation, and the edge processing conditions are as follows: the spindle speed is 30000 rpm, the vacuum negative pressure is 0.75-0.9 Mpa, and the cutting fluid concentration is 30%.

5. The method of claim 4, wherein, the specific content of the step of preliminary cleaning and inspection is: the glass sheet after edge processing is irradiated by a 365nm UV lamp for 3-5 minutes to remove the UV film, then cleaned by three alkaline detergents with ultrasonic cleaning, then washed by four overflow water, then dried at 150°C for 10-15 minutes, and then the state of the glass sheet is inspected to pick out defective products.

6. The method of claim 5, wherein, The specific content of the step of precision grooving is: using a precision scriber, a customized cutter, a special metal jig ring, and a UV film to groove the glass sheet, and then removing the UV film after grooving. The cutter is a customized cutter, the spindle speed is 30000 rpm, and the feed speed is 2 mm / s.

7. The method of claim 6, wherein the glass bending radius R is less than or equal to 1.5 mm. The specific content of the step of chemical strengthening is: using chemical two strong medicine water to strengthen the glass sheet, and opening the bubble function to ensure uniformity, and the etching amount is controlled to be 10 µm.

8. The method of claim 7, wherein the glass bending radius R is less than or equal to 1.5 mm. In the step of tempering treatment, after the chemical tempering treatment of the glass sheet, hot water is used to desalt the tempered glass.

9. The method of claim 8, wherein the glass bending radius R is less than or equal to 1.5 mm. The specific content of the step of final cleaning and packaging is: using 3 alkaline detergents and 4 overflow water washes for final cleaning, without opening the ultrasonic function, drying and inspecting after cleaning, and finally packaging and shipping using thick glass combined with Sydney paper.

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