A wool composite material grinding head and glass cover plate CNC polishing process

Abstract

The present application belongs to the technical field of glass polishing, and particularly relates to a wool composite material grinding head and a glass cover plate CNC polishing process. The wool composite material grinding head comprises the following materials in the following weight proportions: natural wool 75%, nylon 5%, viscose fiber 5% and diamond micro powder 15%. The glass cover plate CNC polishing process comprises the following steps: preparing a large glass substrate raw material; cutting the large glass substrate raw material into a required size by an NC device; first performing CNC edge grinding on the glass cut by the NC device according to conventional production parameters; taking out the CNC edge grinding head, replacing it with the wool composite material grinding head, and performing polishing work according to a set program parameter; taking out the glass polished by the CNC wool composite material grinding head, and performing chemical strengthening; polishing only one side of the glass after chemical strengthening; and performing 4PB bending resistance testing on the glass with one side polished. The present application provides a wool composite material grinding head and a glass cover plate CNC polishing process.

Description

Technical Field

[0001] This invention belongs to the field of glass polishing technology, and specifically relates to a wool composite material grinding head and a CNC polishing process for glass cover plates. Background Technology

[0002] With the rapid development of the electronic display industry, the application fields of electronic glass and smart glass, such as electronic display substrates, cover plates, and light guide plates, are becoming increasingly wide, and the industry scale is constantly climbing. By the end of 2018, my country's total shipments of display panels had surpassed South Korea, making it the world leader. Cover glass, also known as "protective glass," is an important component of electronic product display panels. It plays a supporting and protective role in the display panel, ensuring that the display effect is not affected by friction, scratches, or other operations, and preventing breakage and surface scratches. Cover glass has advantages such as high strength, high hardness, high gloss, good impact resistance, and good scratch resistance. However, in use, cover glass frequently breaks or is damaged due to various reasons. The fragility of glass has always been a difficult problem to solve, especially for portable devices such as mobile phones, which are prone to cracking when dropped, impacted, or scratched. Therefore, it is particularly important to reduce the probability of breakage during daily use by improving the mechanical strength of cover glass. The four-point bending (4PB) test of cover glass can test the bending strength of cover glass and verify its quality. The following manufacturing process is commonly used: raw material - NC - CNC - polishing - strengthening - polishing - 4PB test.

[0003] In the traditional cover glass manufacturing industry, the edges of the cover glass need to be polished after CNC machining to remove the grinding wheel marks and reduce their impact on the 4PB strength test. However, the traditional production process requires another polishing after strengthening to create a stress difference between the two sides of the glass, allowing the glass to bend and achieve a 3D bending effect. This extra polishing process will result in more scratches, and flat polishing cannot completely remove the tool marks on the glass edges. The 4PB test will be affected by the tool marks and scratches. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this invention is to provide a wool composite material grinding head and a CNC polishing process for glass cover plates.

[0005] The technical solution adopted in this invention is as follows: A wool composite grinding head comprises the following materials in the following weight proportions: 75% natural wool, 5% nylon, 5% viscose fiber, and 15% diamond powder.

[0006] The main difference between this invention and the existing technology, which involves grinding the edges normally with a CNC grinding wheel without removing the glass, is that the grinding head is replaced with the wool composite material grinding head mentioned in this invention. The material ratio of the wool composite material grinding head is: 75% natural wool + 5% nylon + 5% viscose fiber + 15% diamond powder.

[0007] High wool content results in a soft and delicate polish that is less likely to scratch the workpiece. Nylon enhances toughness, while viscose improves paste retention and chip locking capabilities. Diamond powder provides moderate cutting force, removing fine lines while creating a clear lens surface, resulting in stable shaping and minimal shedding. Nylon enhances elasticity and toughness, providing excellent surface fit and resistance to bending and cracking. Viscose fibers have strong chip and paste retention capabilities, ensuring stable adhesion of the polishing media and high polishing uniformity. Embedded diamond powder provides micro-cutting force, minimizing minor tool marks and scratches, achieving fine polishing in one step.

[0008] A CNC polishing process for glass covers includes the following steps: S1: Prepare raw materials for large glass substrates; S2: NC equipment cuts large sheets of glass substrate raw materials into the required sizes; S3: First, CNC grind the edges of the glass cut by the NC equipment according to the conventional production parameters; S4: Take out the CNC-ground grinding head, replace it with the wool composite material grinding head mentioned above, and perform polishing operation according to the set program parameters; S5: Take out the glass polished by the CNC wool composite material grinding head and perform chemical strengthening of the glass; S6: Polish only one side of the chemically strengthened glass; S7: Perform a 4PB bending resistance test on the polished single-sided glass.

[0009] This invention utilizes a wool composite material grinding head. During polishing, the high wool content provides a soft and delicate finish, minimizing scratches on the workpiece. Nylon enhances toughness, while viscose improves paste retention and chip locking capabilities. Diamond powder delivers moderate cutting force, removing fine lines while creating a clear lens surface with stable shaping and minimal shedding. The nylon reinforcement enhances elasticity and toughness, ensuring good surface fit and resistance to bending and cracking. Viscose fibers provide strong chip and paste retention capacity, ensuring stable adhesion of the polishing media and high polishing uniformity. Embedded diamond powder provides inherent micro-cutting force, minimizing minor tool marks and scratches, achieving fine polishing in a single step.

[0010] As a preferred embodiment of the present invention, in step S4, the wool composite material grinding head is replaced manually or automatically by the equipment.

[0011] As a preferred embodiment of the present invention, in step S4, the polishing process parameters are: spindle speed of 16000~23000rpm, and feed rate of 0.08~0.25mm / step.

[0012] As a preferred embodiment of the present invention, in step S6, after polishing one side of the glass, the polished surface forms a concave surface.

[0013] As a preferred embodiment of the present invention, in step S6, the pressure difference between the upper and lower surfaces is controlled by the polishing amount. Combined with the difference in thinning amount in different regions, the longer the polishing time, the more surface pressure is removed, the greater the pressure difference between the upper and lower surfaces, and the greater the curvature of the polished surface.

[0014] As a preferred embodiment of the present invention, in step S6, the thin area has a greater bending curvature than the thick area, ultimately achieving precise self-bending.

[0015] As a preferred embodiment of the present invention, in step S7, when performing the 4PB bending resistance test, the bending moment is: M=[ΔCS×DOL×(T DOL)] / 2; Where ΔCS is the compressive stress difference between the upper and lower surfaces, DOL is the absolute depth of ion exchange, and T is the total thickness of the glass.

[0016] As a preferred embodiment of the present invention, in step S7, when performing the 4PB bending test, the bending stiffness is: EI=E×bh 3 / 12; Where E is the elastic modulus of glass, b is the width of glass, and h is the thickness of glass.

[0017] As a preferred embodiment of the present invention, in step S7, when performing the 4PB bending resistance test, the curvature is: k = M / EI = 1 / R; Where R is the radius of curvature.

[0018] The beneficial effects of this invention are as follows: This invention utilizes a wool composite material grinding head. During polishing, the high wool content provides a soft and delicate finish, minimizing scratches on the workpiece. Nylon enhances toughness, while viscose improves paste retention and chip locking capabilities. Diamond powder delivers moderate cutting force, removing fine lines while creating a clear lens surface with stable shaping and minimal shedding. The nylon reinforcement enhances elasticity and toughness, ensuring good surface fit and resistance to bending and cracking. Viscose fibers provide strong chip and paste retention capacity, ensuring stable adhesion of the polishing media and high polishing uniformity. Embedded diamond powder provides inherent micro-cutting force, minimizing minor tool marks and scratches, achieving fine polishing in a single step. Attached Figure Description

[0019] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a schematic diagram of the structure of a wool composite material grinding head. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0022] like Figure 1 As shown, the wool composite material grinding head of this embodiment includes the following materials in the following weight proportions: 75% natural wool, 5% nylon, 5% viscose fiber, and 15% diamond powder.

[0023] The main difference between this invention and the existing technology, which involves grinding the edges normally with a CNC grinding wheel without removing the glass, is that the grinding head is replaced with the wool composite material grinding head mentioned in this invention. The material ratio of the wool composite material grinding head is: 75% natural wool + 5% nylon + 5% viscose fiber + 15% diamond powder.

[0024] High wool content results in a soft and delicate polish that is less likely to scratch the workpiece. Nylon enhances toughness, while viscose improves paste retention and chip locking capabilities. Diamond powder provides moderate cutting force, removing fine lines while creating a clear lens surface, resulting in stable shaping and minimal shedding. Nylon enhances elasticity and toughness, providing excellent surface fit and resistance to bending and cracking. Viscose fibers have strong chip and paste retention capabilities, ensuring stable adhesion of the polishing media and high polishing uniformity. Embedded diamond powder provides micro-cutting force, minimizing minor tool marks and scratches, achieving fine polishing in one step.

[0025] The CNC polishing process for the glass cover plate in this embodiment includes the following steps: S1: Prepare raw materials for large glass substrates; S2: NC equipment cuts large sheets of glass substrate raw materials into the required sizes; S3: First, CNC grind the edges of the glass cut by the NC equipment according to the conventional production parameters; S4: Take out the CNC-ground grinding head, replace it with the wool composite material grinding head mentioned above, and perform polishing operation according to the set program parameters; S5: Take out the glass polished by the CNC wool composite material grinding head and perform chemical strengthening of the glass; S6: Polish only one side of the chemically strengthened glass; S7: Perform a 4PB bending resistance test on the polished single-sided glass.

[0026] This invention utilizes a wool composite material grinding head. During polishing, the high wool content provides a soft and delicate finish, minimizing scratches on the workpiece. Nylon enhances toughness, while viscose improves paste retention and chip locking capabilities. Diamond powder delivers moderate cutting force, removing fine lines while creating a clear lens surface with stable shaping and minimal shedding. The nylon reinforcement enhances elasticity and toughness, ensuring good surface fit and resistance to bending and cracking. Viscose fibers provide strong chip and paste retention capacity, ensuring stable adhesion of the polishing media and high polishing uniformity. Embedded diamond powder provides inherent micro-cutting force, minimizing minor tool marks and scratches, achieving fine polishing in a single step.

[0027] In step S4, the wool composite grinding head is changed manually or automatically by the equipment. When the wool composite grinding head is changed automatically by the equipment, the equipment places the grinding head in a designated position and automatically changes the grinding head after the first edge grinding program is completed.

[0028] In step S4, the polishing process parameters are: spindle speed of 16000~23000rpm, feed rate of 0.08~0.25mm / step, and light pressure bonding processing.

[0029] In step S6, after polishing one side of the glass, the polished surface forms a concave surface.

[0030] In step S6, the pressure difference between the upper and lower surfaces is controlled by the polishing amount. Combined with the difference in thinning amount in different areas, the longer the polishing time, the more surface pressure is removed, the greater the pressure difference between the upper and lower surfaces, and the greater the curvature of the polished surface. At the same time, the thinner area has a greater curvature than the thicker area, ultimately achieving precise self-bending.

[0031] In step S7, during the 4PB bending resistance test, the bending moment is: M=[ΔCS×DOL×(T DOL)] / 2; Where ΔCS is the compressive stress difference between the upper and lower surfaces, DOL is the absolute depth of ion exchange, and T is the total thickness of the glass.

[0032] The bending stiffness is: EI=E×bh 3 / 12; Where E is the elastic modulus of glass, b is the width of glass, and h is the thickness of glass.

[0033] The curvature is: k = M / EI = 1 / R; Where R is the radius of curvature.

[0034] Table 1 is a comparison table of 4PB test data.

[0035]

[0036] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A wool composite material grinding head, characterized in that: The materials include the following weight proportions: 75% natural wool, 5% nylon, 5% viscose fiber, and 15% diamond powder.

2. A glass cover plate CNC polishing process characterized by: Includes the following steps: S1: Prepare raw materials for large glass substrates; S2: NC equipment cuts large sheets of glass substrate raw materials into the required sizes; S3: First, CNC grind the edges of the glass cut by the NC equipment according to the conventional production parameters; S4: Take out the CNC-ground grinding head, replace it with the wool composite material grinding head as described in claim 1, and perform polishing operation according to the set program parameters; S5: Take out the glass polished by the CNC wool composite material grinding head and perform chemical strengthening of the glass; S6: Polish only one side of the chemically strengthened glass; S7: Perform a 4PB bending resistance test on the polished single-sided glass.

3. The glass cover plate CNC polishing process of claim 2, wherein: In step S4, the wool composite grinding head is replaced manually or automatically by the equipment.

4. The glass cover plate CNC polishing process of claim 2, wherein: In step S4, the polishing process parameters are: spindle speed of 16000~23000rpm, and feed rate of 0.08~0.25mm / step.

5. The glass cover plate CNC polishing process of claim 2, wherein: In step S6, after polishing one side of the glass, the polished surface forms a concave surface.

6. The glass cover plate CNC polishing process of claim 2, wherein: In step S6, the pressure difference between the upper and lower surfaces is controlled by the amount of polishing. Combined with the difference in the amount of thinning in different areas, the longer the polishing time, the more surface pressure is removed, the greater the pressure difference between the upper and lower surfaces, and the greater the curvature of the polished surface.

7. The glass cover plate CNC polishing process of claim 6, wherein: In step S6, the thinner region has a greater bending curvature than the thicker region, ultimately achieving precise self-bending.

8. The glass cover plate CNC polishing process of claim 2, wherein: In step S7, during the 4PB bending resistance test, the bending moment is: M=[ΔCS×DOL×(T DOL)] / 2; Where ΔCS is the compressive stress difference between the upper and lower surfaces, DOL is the absolute depth of ion exchange, and T is the total thickness of the glass.

9. The CNC polishing process for a glass cover plate according to claim 8, characterized in that: In step S7, when performing the 4PB bending test, the bending stiffness is: EI = E x bh 3 / 12; Where E is the elastic modulus of glass, b is the width of glass, and h is the thickness of glass.

10. The CNC polishing process for a glass cover plate according to claim 9, characterized in that: In step S7, when performing the 4PB bending resistance test, the curvature is: k = M / EI = 1 / R; Where R is the radius of curvature.

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