Multi-layer grinding wheel for processing display panel glass and preparation method thereof

Abstract

The application relates to the technical field of display panel glass processing, and provides a multilayer grinding wheel for display panel glass processing and a preparation method thereof.The multilayer grinding wheel comprises a first grinding wheel body and a second grinding wheel body, the first grinding wheel body and the second grinding wheel body each comprise a central shaft and a plurality of layers of grinding wheel pieces which are integrally formed with the central shaft, the radius of each layer of the grinding wheel pieces is equal, a groove is formed between two adjacent layers of the grinding wheel pieces, the central shafts of the first grinding wheel body and the second grinding wheel body are arranged in parallel, the grinding wheel pieces are staggered and arranged in the grooves of the opposite grinding wheel bodies, the upper and lower surfaces of the display panel glass are polished at the intersection of the axial projections of the first grinding wheel body and the second grinding wheel body, in the polishing process, sufficient cooling water can surround the abrasive layer and the workpiece, the heat energy generated by friction can be quickly taken away, and the processing debris can be timely discharged along with the cooling water when the glass moves at a high speed, the excellent processing quality is ensured, and the processing speed is greatly improved, and the highest speed can reach 600 mm / s.

Description

Technical Field

[0001] This invention relates to the field of display panel glass processing technology, and in particular to a multi-layer grinding wheel for display panel glass processing and its preparation method. Background Technology

[0002] The mainstream display panel market is transitioning from LCD to OLED and Mini / Micro LED. The glass thickness of these display panels is only about 0.3mm. These new display technologies are driving glass panels to continuously upgrade towards being "larger, thinner, stronger, and more diverse," while placing more stringent requirements on the glass's heat resistance, flatness, and mechanical strength. After glass production, micro-cracks at the edges and corners of the display panel glass need to be removed through grinding. Display panel glass is highly brittle and easily shatters and scratches during machining, often requiring reduced processing speeds to ensure good processing quality.

[0003] CN115519483B discloses a metal-bonded multi-groove grinding wheel for chamfering ultra-thin LCD screen glass. This wheel can be equipped with two diamond grit sizes and two types of grooves, allowing for the simultaneous processing of different types of glass using a single wheel. However, the amount of cooling water entering the grooves is limited, resulting in poor heat dissipation. At high-speed feed, overheating can lead to increased edge and corner chipping defects, affecting edge and corner yields. To ensure ideal processing quality, processing speed must usually be controlled, resulting in lower processing efficiency.

[0004] CN107738196B discloses a bowl-shaped grinding wheel for chamfering liquid crystal glass. By slotting the grinding wheel, its sharpness is improved, meeting the requirements for use at a feed speed of 1000 mm / min without chipping. However, the applicable feed speed of this grinding wheel is only about 16.7 mm / s, indicating significant room for improvement in efficiency.

[0005] How to achieve efficient and rapid glass edge / corner grinding while ensuring processing quality is a key issue that the display panel industry urgently needs to solve. Summary of the Invention

[0006] To address the problem of slow feed speed in existing grinding wheel processing, the first objective of this invention is to provide a multi-layer grinding wheel for processing display panel glass, comprising a first grinding wheel body and a second grinding wheel body arranged axially parallel to each other. The grinding wheel body includes an integrally formed base, which has a central shaft and multiple layers of circular grinding wheel blades. Grooves are formed between adjacent layers of grinding wheel blades, and the grinding wheel blades are staggered and pass through the grooves of opposite grinding wheel bodies. A resin abrasive layer with an equal outer diameter is provided on the outer periphery of each grinding wheel blade. The first grinding wheel body and the second grinding wheel body grind the upper and lower surfaces of the display panel glass at the intersection of their axial projections.

[0007] Specifically, the resin abrasive layer is made by heating and curing the following components by volume: 20%-40% diamond abrasive, 45%-60% phenolic resin, 5%-20% alumina powder, 3%-10% spherical molybdenum disulfide, and 2%-5% composite metal oxide.

[0008] Specifically, the alumina powder has a particle size of 3-10 μm, the spherical molybdenum disulfide has a particle size of 5-20 μm, and the diamond abrasive grains in the resin abrasive layer have a particle size of 325#~1500#.

[0009] Specifically, the composite metal oxide is composed of iron oxide, chromium oxide and rare earth oxide, with a molar ratio of (0.7-0.9):(0.05-0.3):(0.02-0.1), and the rare earth oxide is one or a combination of cerium oxide, neodymium oxide and lanthanum oxide.

[0010] Specifically, in the resin abrasive layer of the multi-layered grinding wheel, the diamond abrasive grains are arranged from coarse to fine in size along the forward direction of the display panel glass.

[0011] Specifically, the first grinding wheel body is provided with chamfered wheels integrally formed with the base body at both ends. The outer periphery of the chamfered wheels is provided with a metal abrasive layer. The metal abrasive layer is sintered from the following components by volume: 12%-25% diamond abrasive, 55%-70% copper-tin-silver pre-alloy powder, 10%-20% copper powder, 3%-8% titanium hydride, and 1%-5% copper-plated graphite powder.

[0012] Specifically, the diamond abrasive grain size of the metal abrasive layer is 400#~1000#.

[0013] Specifically, the composition of the copper-tin-silver pre-alloyed powder is Cu-25Sn-5Ag (wt%).

[0014] Specifically, the chamfering wheel is provided with a chamfered C-angle and / or a chamfered R-angle arc surface, and the diameter of the chamfering wheel is smaller than the diameter of the grinding wheel.

[0015] A second objective of this invention is to provide a method for preparing a multi-layer grinding wheel for processing display panel glass, comprising:

[0016] S1: Weigh out each component of the binder and diamond according to the proportion, pour them into a mixing tank and mix for 4-6 hours. After mixing, remove the mixture and sieve it to obtain the mixture.

[0017] S2: Prepare the metal abrasive layer and the resin abrasive layer separately.

[0018] The resin mixture is poured into the assembled mold, cold-pressed into shape, and then heated and pressurized for curing.

[0019] The metal mixture is poured into the assembled mold, cold-pressed into shape, and then heated and pressurized for sintering.

[0020] S3: Assemble the product in sequence according to the drawing requirements and markings, and assemble the abrasive layer with the substrate;

[0021] S4: Perform finishing on the assembled multi-layer grinding wheel.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention provides a multi-layer grinding wheel for processing display panel glass. The first grinding wheel body and the second grinding wheel body are arranged vertically, and the multi-layer grinding wheel blades share a common base and are staggered. The display panel glass passes through the intersection of the axial projections of the two grinding wheels. The first grinding wheel body and the second grinding wheel body grind the upper and lower surfaces of the display panel glass respectively. Grooves are provided between each layer of grinding wheel blades to ensure that sufficient cooling water surrounds the abrasive layer and the workpiece during the grinding process, quickly removes the heat generated by friction, and facilitates the timely discharge of processing debris with the cooling water when the glass moves at high speed. With the cooperation of the grinding wheel structure and the abrasive layer, the processing speed is greatly improved while ensuring excellent processing quality, up to 600mm / s.

[0024] 2. The first grinding wheel body has integrated chamfering wheels at both ends. The C and R corners of the display panel glass can be ground directly by the horizontal movement of the grinding wheel without the need to replace the grinding wheel or add a secondary processing step, which improves work efficiency and can meet the needs of different panels, ensuring the processing of multiple specifications of panels on the same production line.

[0025] 3. The grinding wheel is made of resin abrasive layer with optimized formula. The spherical molybdenum disulfide uniformly filled in the resin abrasive layer retains the excellent low friction coefficient of molybdenum disulfide, reduces frictional heat, and improves the sharpness of the grinding wheel, so that the grinding wheel can be stably processed for a long time under the high-speed impact of glass. The composite metal oxide, through the doping of chromium oxide and iron oxide with rare earth oxides, creates lattice defects to form a solid solution, which improves the activity of the original powder, enhances the polishing effect during glass processing, and improves the edge quality of glass.

[0026] 4. The chamfering wheel is made of a metal abrasive layer with an optimized formula. Through the interfacial strengthening effect of titanium hydride, the diamond's retention in the matrix is ​​improved, ensuring the shape retention force of the R and C angles. The copper-plated graphite can control the pore formation, ensuring the sharpness of the metal abrasive layer while alleviating the density difference between graphite and metal components, thus solving the segregation problem in the mixing and molding process.

[0027] 5. The diamond abrasive grains are also arranged in a gradient. Along the forward direction of the display panel glass, the diamond abrasive grains are arranged from coarse to fine in sequence, and the edges of the display panel glass are coarsely and finely polished in sequence. The coarse abrasive wheel on the front side ensures the removal of excess material, while the one on the back side is used for fine polishing to ensure the processing quality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the multi-layer grinding wheel assembly in Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the multi-layer grinding wheel assembly in Embodiment 2 of the present invention;

[0030] Figure 3 This is a schematic diagram of the metal abrasive layer structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the multi-layer grinding wheel structure of Comparative Example 3 of the present invention;

[0032] Figure 5 This is a physical image of the grinding wheel of the present invention;

[0033] Figure 6 The images show the effect of processing the edge of the display panel glass using the grinding wheel of Example 1. A, B, and C are the grinding effect images of the edge of the display panel glass at panel speeds of 300 mm / s, 400 mm / s, and 600 mm / s, respectively.

[0034] Figure 7 The images show the effect of processing the edge of the display panel glass using the grinding wheel in Comparative Example 1. A, B, and C are the grinding effect images of the display panel glass edge at panel speeds of 300 mm / s, 400 mm / s, and 600 mm / s, respectively.

[0035] Figure 8 The image shows the effect of processing the edge of the display panel glass using the grinding wheel in Comparative Example 2. A, B, and C are the grinding effect images of the display panel glass edge at panel speeds of 300 mm / s, 400 mm / s, and 600 mm / s, respectively.

[0036] Figure 9 The images show the effect of grinding the corners of the display panel glass with a chamfering wheel, where a, b, and c are the grinding effect images of Example 1, Comparative Example 1, and Comparative Example 2, respectively.

[0037] Figure 10The images show the effect of processing the edge of the display panel glass using the grinding wheel of Example 2. A, B, and C are the grinding effect images of the edge of the display panel glass at panel speeds of 300 mm / s, 400 mm / s, and 600 mm / s, respectively.

[0038] Figure 11 The images show the effect of processing the edge of the display panel glass using the comparative example 3 grinding wheel. A, B, and C are the grinding effect images of the display panel glass edge at panel speeds of 300mm / s, 400mm / s, and 600mm / s, respectively.

[0039] Figure label:

[0040] 1. First grinding wheel body; 2. Second grinding wheel body; 3. Central shaft; 4. Grinding wheel disc; 5. Chamfering wheel; 6. Groove; 7. Resin abrasive layer; 8. Metal abrasive layer; 9. Matrix. Detailed Implementation

[0041] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] like Figures 1-3 , Figure 5 As shown, in order to solve the problem of low feed speed of grinding wheel for the edge of display panel glass in the prior art, resulting in low processing efficiency of display panel glass, the present invention provides a multi-layer grinding wheel for processing display panel glass, which uses two sets of staggered multi-layer grinding wheels to grind both sides of the display panel glass at the same time.

[0044] The multi-layer grinding wheel includes a first grinding wheel body 1 and a second grinding wheel body 2 arranged axially parallel to each other. Each grinding wheel body includes an integrally formed base 9, which has a central shaft and multiple layers of circular grinding wheel blades 4. Grooves 6 are formed between adjacent layers of grinding wheel blades 4, and the grinding wheel blades 4 are staggered and pass through the grooves 6 of opposite grinding wheel bodies. A resin abrasive layer 7 of equal outer diameter is provided on the outer periphery of each grinding wheel blade 4. The first grinding wheel body 1 and the second grinding wheel body 2 grind the upper and lower surfaces of the display panel glass at the intersection of their axial projections. Chamfered wheels 5, integrally formed with the central shaft 3, are provided at both ends of the first grinding wheel body 1. A metal abrasive layer 8 is provided on the outer periphery of the chamfered wheels 5 for grinding the corners of the display panel glass.

[0045] The grinding wheel body diameter D is 80-150mm, the grinding wheel body length T is 50-100mm, the width X of the resin abrasive layer 7 is 3-15mm, the thickness T1 of the single resin abrasive layer is 3-6mm, and the thickness T2 of the single metal abrasive layer is 6-15mm. The depth of the grinding wheel groove 6 is usually 1 / 3-1 / 4 of the outer diameter of the abrasive layer. The width of the groove 6 that intersects with other abrasive layers is determined according to the actual thickness of the abrasive layer. The width of the groove 6 is 2-20mm greater than the width of the grinding wheel 4. After the first grinding wheel body 1 and the second grinding wheel body 2 are assembled, the gap C between two adjacent grinding wheel 4 layers is 1-10mm. This avoids the difficulty of grinding wheel installation due to excessively small gaps, which would also reduce the grinding chip removal space and hinder the advantage of improving the sharpness of the grinding wheel through the gap of the base body 9. It also prevents the total thickness of the grinding wheel from increasing significantly when the gap is too large, which would correspondingly increase the requirements for the dynamic balance and coaxiality of the grinding wheel, and increase unnecessary manufacturing costs. The distance between the central axis 3 of the first grinding wheel body 1 and the second grinding wheel body 2 can be adjusted according to the thickness of the grinding display panel.

[0046] Preferably, the second grinding wheel body 2 is the upper wheel, and the number of layers is preferably 4 or 5. The first grinding wheel body 1 is the lower wheel, and the number of layers is preferably 6, including 4 layers of grinding wheel discs 4 and 2 layers of chamfering wheels 5. The chamfering wheels 5 are respectively arranged at both ends of the first grinding wheel body 1 along the axial direction. The chamfering wheels 5 are provided with inclined surfaces for chamfering C-angles and / or arc surfaces for chamfering R-angles. The diameter of the chamfering wheels 5 is 8-20 mm smaller than the diameter of the grinding wheel discs 4 to prevent interference with the four grinding wheel discs 4 in the middle.

[0047] When this multi-layer grinding wheel is in operation, the first grinding wheel body 1 and the second grinding wheel body 2 are arranged vertically and interlock through grooves 6. The display panel glass is fed along the intersection of the two wheels and ground. The first grinding wheel body 1 and the second grinding wheel body 2 grind the upper and lower surfaces of the display panel glass, respectively. Grooves 6 are provided between each layer of grinding wheel 4, ensuring sufficient cooling water surrounds the abrasive layer and the workpiece during grinding, quickly removing the heat generated by friction, and facilitating the timely discharge of processing debris with the cooling water when the glass moves at high speed. This significantly improves the processing speed, reaching up to 600 mm / s. When grinding corners, the first grinding wheel body 1 moves laterally towards one side of the display panel glass to achieve corner grinding without the need to change grinding wheels or perform secondary grinding processes. Furthermore, the metal abrasive layer 8 can be made with R-angles and C-angles to accommodate different panel requirements, ensuring the processing of multiple panel specifications on the same production line.

[0048] The design of multiple abrasive layers sharing a single substrate 9 not only solves the problems of poor concentricity / coaxiality and outer diameter runout when multiple grinding wheels are used together, ensuring the processing quality of the panel; but also reduces the loading, unloading and calibration time when multiple grinding wheels are used together, significantly improving work efficiency.

[0049] The base of the grinding wheel can be made of materials such as aluminum alloy, stainless steel, and carbon fiber, which meet the strength requirements of high-speed rotation of the grinding wheel.

[0050] The resin abrasive layer, by volume, is made from the following components through cold pressing and heat-curing: 20%-40% diamond abrasive grains (325#~1500#), 45%-60% phenolic resin, 5%-20% alumina powder (3-10μm), 3%-10% spherical molybdenum disulfide (5-20μm), and 2%-5% composite metal oxides, with the total percentage of the above raw materials being 100%. The phenolic resin is a thermosetting phenolic resin. The composite metal oxides consist of iron oxide, chromium oxide, and rare earth oxides, with a molar ratio of (0.7-0.9):(0.05-0.3):(0.02-0.1). The rare earth oxides are one or a combination of cerium oxide, neodymium oxide, and lanthanum oxide.

[0051] Phenolic resin encapsulates and holds diamond abrasive grains, various fillers, and additives, binding dispersed solid particles into a unified whole with a fixed shape and strength. Diamond abrasive grains form the grinding body of the abrasive wheel, polishing the display panel glass with their sharp edges. Alumina powder, as an ultrafine auxiliary abrasive, has a hardness lower than diamond but higher than glass, removing deeper scratches left by diamond. Spherical molybdenum disulfide retains the excellent low coefficient of friction of molybdenum disulfide, reducing frictional heat and improving the sharpness of the abrasive wheel; it also avoids the weaknesses of sheet-like molybdenum disulfide, such as difficulty in dispersion and sharp edges leading to stress concentration. The uniform filling of spherical molybdenum disulfide in the resin abrasive layer ensures the stability and strength of the phenolic resin matrix, enabling the abrasive wheel to operate stably for extended periods under the high-speed impact of glass. Composite metal oxides, through the doping of chromium oxide and iron oxide with rare earth oxides, create lattice defects to form a solid solution, increasing the activity of the original powder and enhancing the polishing effect during glass processing, thus improving the edge quality of the glass.

[0052] Furthermore, in the resin abrasive layer, the diamond abrasive grains in the multi-layer grinding wheels can be identical. The diamond abrasive grain size can also be arranged in a gradient, with the diamond abrasive grain size arranged sequentially from coarse to fine along the forward direction of the display panel glass. This sequentially performs rough and fine polishing on the edges of the display panel glass. The coarse-grained grinding wheels on the front side ensure the removal of excess material, while the wheels on the rear side perform fine polishing to ensure processing quality.

[0053] The metal abrasive layer, by volume, is made from the following components through cold pressing and heated sintering: 12%–25% diamond abrasive grains (400#~1000#), 55%–70% copper-tin-silver pre-alloy powder, 10%–20% copper powder, 3%–8% titanium hydride, and 1%–5% copper-plated graphite powder. Specifically, the copper-tin-silver pre-alloy powder is Cu-25Sn-5Ag, composed of the following mass percentages: Sn 25%±1wt%, Ag 5%±0.5wt%, with the balance being copper.

[0054] The metal abrasive layer uses copper-tin-silver pre-alloyed powder as a matrix, forming a continuous and dense alloy skeleton through sintering. The addition of silver reduces the surface tension of the liquid alloy during preparation, decreasing the contact angle between the liquid alloy and the diamond surface, making it easier for droplets to spread into a film and encapsulate the abrasive grains, thus improving the wettability and sharpness of the metal abrasive layer. Copper powder remains in the solid phase during sintering, acting as a toughening agent and plasticity modifier. Titanium hydride has an interfacial strengthening effect, improving the diamond's retention within the matrix and ensuring the shape retention force of the R-angle and C-angle. Copper-plated graphite allows for controlled pore formation, increasing the chip space of the grinding wheel, ensuring the sharpness of the metal abrasive layer while mitigating the density difference between graphite and metal components, and solving the segregation problem during the mixing and forming process. The addition of copper-plated graphite effectively improves the sharpness of the grinding wheel without affecting its strength.

[0055] The high sharpness of the resin abrasive layer and the metal abrasive layer, combined with the multi-layer grinding wheel design, promotes chip removal and heat dissipation, ensuring machining stability. Their synergistic effect maximizes the machining quality and lifespan of the grinding wheel under high-speed feed.

[0056] The present invention also provides a method for preparing a multilayer grinding wheel for processing the above-mentioned display panel glass, comprising the following steps:

[0057] S1: Weigh out each component of the binder and diamond according to the proportion, pour them into a mixing tank and mix for 4-6 hours. After mixing, remove the mixture and sieve it to obtain the mixture.

[0058] S2: Prepare the metal abrasive layer and the resin abrasive layer separately, pour the resin mixture into the assembled mold, cold press to form, and heat and pressurize to cure;

[0059] The metal mixture is poured into the assembled mold, cold-pressed into shape, and then heated and pressurized for sintering.

[0060] Preferably, the heating and pressurizing conditions for the metal mixture are: pressurization pressure 230-380MPa, heating temperature 700-800℃, and holding time 80-100 minutes;

[0061] Preferably, the heating and pressurizing conditions for the resin mixture are: pressurization pressure 80-120MPa, heating temperature 180-200℃, and holding time 60-120 minutes.

[0062] S3: Assemble the product in sequence according to the drawing requirements and markings, and assemble the abrasive layer with the substrate;

[0063] The abrasive layer can be directly sintered onto a single-layer substrate blank, and after interference fit assembly, it can be precision machined to obtain an integrated grinding wheel product; the abrasive layer can also be bonded to the grinding wheel substrate with an adhesive.

[0064] S4: Perform finishing on the assembled multi-layer grinding wheel;

[0065] The finishing process includes CNC precision turning, automatic grinding wheel dressing, electrical discharge machining dressing, and dynamic balancing.

[0066] In the following embodiments, unless otherwise specified, all raw materials used are commercially available products that can be purchased in the art. The composite metal oxide raw materials are commercially available, and the final powder used is prepared by re-processing according to the required proportions. The titanium hydride powder used is from Beijing Deco Island Gold Technology Co., Ltd., with an average particle size of 3 μm and a purity of over 99.5%.

[0067] Example 1

[0068] A method for preparing a multi-layer grinding wheel for high-efficiency processing of display panel glass, wherein the preparation method is as follows: Figure 1 The multi-layer grinding wheel shown includes the following steps:

[0069] The volumetric composition of the resin abrasive layer is as follows: 30% diamond abrasive, 50% phenolic resin, 10% alumina powder, 5% spherical molybdenum disulfide, and 5% composite metal oxide, composed of iron oxide, chromium oxide, and cerium oxide, with a molar ratio of 0.9:0.08:0.02. The first grinding wheel body has four resin abrasive layers with diamond grit sizes of 500#, 800#, 1200#, and 1500#, respectively. The second grinding wheel body has five resin abrasive layers with diamond grit sizes of 500#, 800#, 1200#, 1500#, and 1500#, respectively.

[0070] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 6 hours. After mixing, remove the mixture and pass it through a 100# sieve to obtain the mixture. Pour the resin mixture into the assembled mold, cold press it into shape, apply a pressure of 110 MPa, heat it to 180℃ and hold it for 80 minutes. Mix, mold, and cure the resin-bonded abrasive layer in order of increasing mesh size to obtain the final product.

[0071] The volumetric composition of the metal abrasive layer is as follows: 12% diamond abrasive, 69% Cu-25Sn-5Ag pre-alloyed powder, 10% copper powder, 7% titanium hydride, and 2% copper-plated graphite powder. The diamond used has a particle size of 1000#.

[0072] Weigh out the binder components and diamond according to the proportions, pour them into a mixing tank and mix for 4 hours. After mixing, remove the mixture and pass it through an 80# sieve to obtain the mixture. Pour the metal mixture into the assembled mold, cold press it into shape, apply a pressure of 320MPa, heat it to 760℃ and hold it for 90 minutes.

[0073] According to the drawing requirements and markings, the abrasive layer is bonded to the grinding wheel substrate in sequence using adhesive.

[0074] The CNC precision-machined base is then dressed to the required dimensions using an automatic grinding wheel dresser, followed by dynamic balancing to obtain the desired multi-layer grinding wheel.

[0075] Comparative Example 1

[0076] The difference between Comparative Example 1 and Example 1 is that the spherical molybdenum disulfide in the resin-bonded abrasive layer is replaced with traditional flake molybdenum disulfide, and the copper-plated graphite powder in the metal abrasive layer is replaced with ordinary graphite powder. Otherwise, they are the same as in Example 1.

[0077] Comparative Example 2

[0078] The difference between Comparative Example 2 and Example 1 is that the composite metal oxide in the resin binder abrasive layer is replaced with iron oxide powder, and the Cu-25Sn-5Ag pre-alloy powder in the metal abrasive layer is replaced with Cu-25Sn pre-alloy powder. Otherwise, they are the same as in Example 1.

[0079] The grinding wheels obtained in Example 1, Comparative Examples 1 and 2 were applied to the processing of panel glass. Specific process parameters and grinding effects are shown in Table 1. Photos of the processed panel glass edges are shown below. Figures 6-8 Images a, b, and c show the polishing effects of the display panel glass edges at panel speeds of 300mm / s, 400mm / s, and 600mm / s, respectively. Photos of the processed corners of the display panel glass are shown below. Figure 9 Where a, b, and c are the polishing effect diagrams of Example 1, Comparative Example 1, and Comparative Example 2, respectively.

[0080] Table 1. Comparison data of Example 1 and Comparative Examples 1 / 2

[0081]

[0082] When the grinding wheel prepared in Example 1 of this invention was used to process the glass panel, with a grinding wheel speed of 6000-8000 rpm, a workpiece grinding allowance of 0.2 mm, and panel moving speeds of 300 mm / s, 400 mm / s, and 600 mm / s respectively, the yield rate of glass edges and corners was above 99%, and the processed glass edges / corners were almost free of chipping. In contrast, Comparative Examples 1 and 2 both showed varying degrees of chipping and cracking.

[0083] As shown in Table 1, the addition of spherical molybdenum disulfide and composite metal oxides ensured the uniformity of the resin abrasive layer and the polishing effect, guaranteeing the processing quality of the panel edges. This effect became more pronounced with increasing feed speed. The addition of copper-plated graphite reduced segregation in the metal abrasive layer, preventing edge chipping at corners due to uneven graphite distribution. The processing with copper-tin-silver pre-alloy powder exhibited higher wettability and sharpness than copper-tin pre-alloy powder, resulting in better processing quality in corner machining.

[0084] Example 2

[0085] A method for preparing a multi-layer grinding wheel for high-efficiency processing of display panel glass includes the following steps:

[0086] The volumetric composition of the resin abrasive layer is as follows: 25% diamond abrasive grains, 55% phenolic resin, 12% alumina powder, 4% spherical molybdenum disulfide, and 4% composite metal oxide, consisting of iron oxide, chromium oxide, and neodymium oxide, with a molar ratio of 0.75:0.15:0.1. The diamond grains used in the resin abrasive layer are all 600#.

[0087] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 5 hours. After mixing, pass the mixture through a 100# sieve to obtain the final mixture. Pour the resin mixture into an assembled mold with a matrix, cold press it to form the desired shape, then apply a pressure of 100 MPa and heat it to 185°C for 60 minutes. Repeat the mixing, molding, and curing process to obtain the resin-bonded abrasive layer.

[0088] The volumetric composition of the metal abrasive layer is as follows: 15% diamond abrasive, 60% Cu-25Sn-5Ag pre-alloyed powder, 15% copper powder, 6% titanium hydride, and 4% copper-plated graphite powder. The diamond used has a particle size of 400#.

[0089] Weigh out the binder components and diamond according to the proportions, pour them into a mixing tank and mix for 6 hours. After mixing, remove the mixture and pass it through an 80# sieve to obtain the mixture. Pour the metal mixture into the assembled mold, cold press it into shape, apply a pressure of 280MPa, heat it to 720℃ and hold it for 80 minutes.

[0090] According to the drawings and markings, assemble the resin abrasive layer with the substrate in sequence, and use adhesive to bond the metal abrasive layer to the grinding wheel substrate.

[0091] The CNC precision-machined base is then dressed to the required dimensions using an automatic grinding wheel dresser, the radius (R) is adjusted using electrical discharge machining (EDM), and dynamic balancing is performed to obtain the desired multi-layer grinding wheel.

[0092] Comparative Example 3

[0093] The difference between Comparative Example 3 and Example 2 is that: Figure 4 As shown, the grinding wheel consists of four individual grinding wheels, which are stacked together during use. The dimensions of the stacked grinding wheels are consistent with those in Example 2. Everything else is the same as in Example 2.

[0094] The grinding wheels obtained in Example 2 and Comparative Example 3 were applied to the processing of panel glass, and the specific process parameters and grinding effects are shown in Table 2. Photos showing the processed edges of the panel glass are shown below. Figures 10-11 The images show the polishing effects of the display panel glass edge at panel speeds of 300mm / s, 400mm / s, and 600mm / s, respectively.

[0095] Table 2. Comparison data of test results between Example 2 and Comparative Example 3.

[0096]

[0097] When the grinding wheel made in Example 2 of this invention is used to process the glass panel, with a grinding wheel speed of 8000-14000 rpm, a workpiece grinding allowance of 0.4 mm, and panel moving speeds of 300 mm / s, 400 mm / s, and 600 mm / s, the yield rate of the panel edges / corners is above 99%. In contrast, in Comparative Example 3, wavy patterns appear on the edges under different processing conditions, leading to poor processing.

[0098] As can be seen from the table, the multi-layer integrated substrate of Embodiment 2 of the present invention ensures higher concentricity and stability of the grinding wheels. In contrast, the combination of four individual grinding wheels in Comparative Example 3 resulted in wavy patterns on the glass due to substrate precision issues, failing to meet the usage requirements.

[0099] Example 3

[0100] A method for preparing a multi-layer grinding wheel for high-efficiency processing of display panel glass includes the following steps:

[0101] The volumetric composition of the resin abrasive layer is as follows: 26% diamond abrasive grains, 52% phenolic resin, 15% alumina powder, 3% spherical molybdenum disulfide, and 4% composite metal oxide, consisting of iron oxide, chromium oxide, and lanthanum oxide, with a molar ratio of 0.86:0.1:0.04. The diamond grains used in the resin abrasive layer are all 800#.

[0102] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 5.5 hours. After mixing, remove the mixture and pass it through a 100# sieve to obtain the mixture. Pour the resin mixture into an assembled mold with a matrix, cold press it into shape, apply a pressure of 115 MPa, heat it to 200℃ and hold it for 100 minutes. Repeat the mixing-molding-curing process to obtain the resin-bonded abrasive layer.

[0103] The volumetric composition of the metal abrasive layer is as follows: 20% diamond abrasive, 58% Cu-25Sn-5Ag pre-alloyed powder, 16% copper powder, 4% titanium hydride, and 2% copper-plated graphite powder. The diamond used has a particle size of 800#.

[0104] Weigh out the binder components and diamond according to the proportions, pour them into a mixing tank and mix for 5 hours. After mixing, remove the mixture and pass it through an 80# sieve to obtain the mixture. Pour the metal mixture into the assembled mold, cold press it into shape, apply a pressure of 300MPa, heat it to 740℃ and hold it for 85 minutes.

[0105] According to the drawings and markings, assemble the resin abrasive layer with the substrate in sequence, and use adhesive to bond the metal abrasive layer to the grinding wheel substrate.

[0106] The CNC precision-machined base is then dressed to the required dimensions using an automatic grinding wheel dresser, the radius (R) is adjusted using electrical discharge machining (EDM), and dynamic balancing is performed to obtain the desired multi-layer grinding wheel.

[0107] Example 4

[0108] A method for preparing a multi-layer grinding wheel for high-efficiency processing of display panel glass includes the following steps:

[0109] The volumetric composition of the resin abrasive layer is as follows: 40% diamond abrasive grains, 46% phenolic resin, 9% alumina powder, 3% spherical molybdenum disulfide, and 2% composite metal oxide, composed of iron oxide, chromium oxide, and cerium oxide, with a molar ratio of 0.7:0.2:0.1. The first grinding wheel body has four resin abrasive layers with diamond grit sizes of 325#, 325#, 400#, and 400#, respectively. The second grinding wheel body has five resin abrasive layers with diamond grit sizes of 325#, 325#, 325#, 400#, and 400#, respectively.

[0110] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 6 hours. After mixing, remove the mixture and pass it through a 100# sieve to obtain the mixture. Pour the resin mixture into the assembled mold, cold press it into shape, apply a pressure of 80 MPa, heat it to 195℃ and hold it for 120 minutes. Following the order of fine to coarse mesh, mix, mold, and cure sequentially to obtain the resin-bonded abrasive layer.

[0111] The volumetric composition of the metal abrasive layer is as follows: 22% diamond abrasive, 55% Cu-25Sn-5Ag pre-alloyed powder, 15% copper powder, 3% titanium hydride, and 5% copper-plated graphite powder. The diamond used has a particle size of 400#.

[0112] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 4.5 hours. After mixing, remove the mixture and pass it through an 80# sieve to obtain the final mixture. Pour the metal mixture into the assembled mold, cold press it into shape, apply a pressure of 360 MPa, heat it to 800℃ and hold it for 85 minutes.

[0113] According to the drawings and markings, assemble the resin abrasive layer with the substrate in sequence, and use adhesive to bond the metal abrasive layer to the grinding wheel substrate.

[0114] The CNC precision-machined base is then dressed to the required dimensions using an automatic grinding wheel dresser, the radius (R) is adjusted using electrical discharge machining (EDM), and dynamic balancing is performed to obtain the desired multi-layer grinding wheel.

[0115] Example 5

[0116] A method for preparing a multi-layer grinding wheel for high-efficiency processing of display panel glass includes the following steps:

[0117] The volumetric composition of the resin abrasive layer is as follows: 33% diamond abrasive grains, 50% phenolic resin, 5% alumina powder, 10% spherical molybdenum disulfide, and 2% composite metal oxide, composed of iron oxide, chromium oxide, and lanthanum oxide, with a molar ratio of 0.8:0.14:0.06. The first grinding wheel body has four resin abrasive layers with diamond grit sizes of 500#, 600#, 800#, and 1000#, respectively. The second grinding wheel body has five resin abrasive layers with diamond grit sizes of 500#, 600#, 800#, 1000#, and 1000#, respectively.

[0118] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 5 hours. After mixing, remove the mixture and pass it through a 100# sieve to obtain the mixture. Pour the resin mixture into the assembled mold, cold press it into shape, apply a pressure of 110 MPa, heat it to 190℃ and hold it for 110 minutes. Mix, mold, and cure the resin-bonded abrasive layer in order of increasing mesh size to obtain the final product.

[0119] The volumetric composition of the metal abrasive layer is as follows: 17% diamond abrasive, 61% Cu-25Sn-5Ag pre-alloyed powder, 10% copper powder, 7% titanium hydride, and 5% copper-plated graphite powder. The diamond used has a particle size of 1000#.

[0120] Weigh out the binder components and diamond according to the proportions, pour them into a mixing tank and mix for 4 hours. After mixing, remove the mixture and pass it through an 80# sieve to obtain the mixture. Pour the metal mixture into the assembled mold, cold press it into shape, apply a pressure of 250MPa, heat it to 710℃ and hold it for 90 minutes.

[0121] According to the drawings and markings, assemble the resin abrasive layer with the substrate in sequence, and use adhesive to bond the metal abrasive layer to the grinding wheel substrate.

[0122] The CNC precision-machined base is then dressed to the required dimensions using an automatic grinding wheel dresser, the radius (R) is adjusted using electrical discharge machining (EDM), and dynamic balancing is performed to obtain the desired multi-layer grinding wheel.

[0123] Example 6

[0124] A method for preparing a multi-layer grinding wheel for high-efficiency processing of display panel glass includes the following steps:

[0125] The volumetric composition of the resin abrasive layer is as follows: 28% diamond abrasive grains, 54% phenolic resin, 13% alumina powder, 3% spherical molybdenum disulfide, and 2% composite metal oxide, composed of iron oxide, chromium oxide, and neodymium oxide, with a molar ratio of 0.75:0.15:0.1. The first grinding wheel body uses four resin abrasive layers with diamond grit sizes of 400#, 500#, 600#, and 800#, respectively. The second grinding wheel body also uses four resin abrasive layers with diamond grit sizes of 400#, 500#, 600#, and 800#, respectively.

[0126] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 5.5 hours. After mixing, remove the mixture and pass it through a 100# sieve to obtain the mixture. Pour the resin mixture into the assembled mold, cold press it into shape, apply a pressure of 80 MPa, heat it to 200℃ and hold it at that temperature for 95 minutes. Following the order of fine to coarse mesh, mix, mold, and cure sequentially to obtain the resin-bonded abrasive layer.

[0127] The volumetric composition of the metal abrasive layer is as follows: 22% diamond abrasive, 62% Cu-25Sn-5Ag pre-alloyed powder, 10% copper powder, 4% titanium hydride, and 2% copper-plated graphite powder. The diamond used has a particle size of 600#.

[0128] Weigh out the binder components and diamond according to the specified proportions, pour them into a mixing tank and mix for 5.5 hours. After mixing, remove the mixture and pass it through an 80# sieve to obtain the mixture. Pour the metal mixture into the assembled mold, cold press it into shape, apply a pressure of 360 MPa, heat it to 700℃ and hold it at that temperature for 85 minutes.

[0129] According to the drawings and markings, assemble the resin abrasive layer with the substrate in sequence, and use adhesive to bond the metal abrasive layer to the grinding wheel substrate.

[0130] The CNC precision-machined base is then dressed to the required dimensions using an automatic grinding wheel dresser, the radius (R) is adjusted using electrical discharge machining (EDM), and dynamic balancing is performed to obtain the desired multi-layer grinding wheel.

[0131] Table 3 Test data for Examples 3-6

[0132]

[0133] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A multi-layer grinding wheel for processing display panel glass, characterized in that, The device includes a first grinding wheel and a second grinding wheel arranged in parallel along the axial direction. Each grinding wheel includes an integrally formed base. The base has a central shaft and multiple layers of circular grinding wheels. Grooves are formed between adjacent layers of grinding wheels. The grinding wheels are staggered and pass through the grooves of opposite grinding wheel bodies. A resin abrasive layer with an equal outer diameter is provided on the outer periphery of each grinding wheel. The first grinding wheel and the second grinding wheel are used to polish the upper and lower surfaces of the display panel glass at the intersection of their axial projections.

2. The multi-layer grinding wheel for processing display panel glass according to claim 1, characterized in that, The resin abrasive layer is made by heating and curing the following components by volume: 20%-40% diamond abrasive, 45%-60% phenolic resin, 5%-20% alumina powder, 3%-10% spherical molybdenum disulfide, and 2%-5% composite metal oxide.

3. The multi-layer grinding wheel for processing display panel glass according to claim 2, characterized in that, The alumina powder has a particle size of 3-10 μm, the spherical molybdenum disulfide has a particle size of 5-20 μm, and the diamond abrasive grains in the resin abrasive layer have a particle size of 325#~1500#.

4. The multi-layer grinding wheel for processing display panel glass according to claim 2, characterized in that, The composite metal oxide is composed of iron oxide, chromium oxide and rare earth oxide, with a molar ratio of (0.7-0.9):(0.05-0.3):(0.02-0.1). The rare earth oxide is one or a combination of cerium oxide, neodymium oxide and lanthanum oxide.

5. The multi-layer grinding wheel for processing display panel glass according to claim 2, characterized in that, In the resin abrasive layer of the multi-layered grinding wheel, the diamond abrasive grains are arranged from coarse to fine in size along the forward direction of the display panel glass.

6. The multi-layer grinding wheel for processing display panel glass according to claim 1, characterized in that, Both ends of the first grinding wheel are provided with chamfered wheels integrally formed with the substrate. The outer periphery of the chamfered wheel is provided with a metal abrasive layer. The metal abrasive layer is sintered from the following components by volume: 12%-25% diamond abrasive, 55%-70% copper-tin-silver pre-alloy powder, 10%-20% copper powder, 3%-8% titanium hydride, and 1%-5% copper-plated graphite powder.

7. The multi-layer grinding wheel for processing display panel glass according to claim 6, characterized in that, The diamond abrasive grain size of the metal abrasive layer is 400#~1000#.

8. The multi-layer grinding wheel for processing display panel glass according to claim 6, characterized in that, The composition of the copper-tin-silver pre-alloyed powder is Cu-25Sn-5Ag (wt%).

9. The multi-layer grinding wheel for processing display panel glass according to claim 6, characterized in that, The chamfering wheel is provided with a chamfered C-angle and / or a chamfered R-angle arc surface, and the diameter of the chamfering wheel is smaller than the diameter of the grinding wheel.

10. A method for preparing a multi-layer grinding wheel for processing display panel glass, comprising preparing the multi-layer grinding wheel for processing display panel glass as described in any one of claims 1-9, characterized in that, include: S1: Weigh out each component of the binder and diamond according to the proportion, pour them into a mixing tank and mix for 4-6 hours. After mixing, remove the mixture and sieve it to obtain the mixture. S2: Prepare the metal abrasive layer and the resin abrasive layer separately. The resin mixture is poured into the assembled mold, cold-pressed into shape, and then heated and pressurized for curing. The metal mixture is poured into the assembled mold, cold-pressed into shape, and then heated and pressurized for sintering. S3: Assemble the product in sequence according to the drawing requirements and markings, and assemble the abrasive layer with the substrate; S4: Perform finishing on the assembled multi-layer grinding wheel.

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