CN114378729B - Chamfering grinding wheel for touch screen glass processing and preparation method thereof - Google Patents
Chamfering grinding wheel for touch screen glass processing and preparation method thereof Download PDFInfo
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- CN114378729B CN114378729B CN202111606737.4A CN202111606737A CN114378729B CN 114378729 B CN114378729 B CN 114378729B CN 202111606737 A CN202111606737 A CN 202111606737A CN 114378729 B CN114378729 B CN 114378729B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
- B24D3/10—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for porous or cellular structure, e.g. for use with diamonds as abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/02—Alloys based on copper with tin as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
- C22C2026/008—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes with additional metal compounds other than carbides, borides or nitrides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a chamfering grinding wheel for touch screen glass processing and a preparation method thereof, wherein a metal matrix and a diamond mixture are subjected to cold pressing to obtain a cold-pressed blank; sintering and hot-pressing the cold-pressed blank to obtain a chamfering grinding wheel for processing the touch screen glass; the metal matrix comprises copper powder, tin powder, nano titanium powder and zirconia powder. The prior art has very few researches on a touch screen glass chamfering grinding wheel, and the chamfering wheel for glass has higher requirements on sharpness, diamond holding and service life of the grinding wheel due to larger cutting allowance and higher speed. The invention has simple formula, adopts copper powder, tin powder, nano titanium powder, zirconia powder and diamond, does not need other additives, reduces the cost, simplifies the mixing process, and also avoids the problems of complicated feeding inspection of various raw materials and difficult mutual matching.
Description
Technical Field
The invention belongs to the grinding wheel technology, and particularly relates to a chamfering grinding wheel for touch screen glass processing and a preparation method thereof.
Background
The rapid development of the information age, the rapid development of the electronic information industries such as flat panel display, intelligent terminals and the like, which increases the multimedia information inquiry, makes the application of the touch screen more and more popular. The touch screen is used as the latest computer input equipment, is easy to operate and convenient, and has the advantages of firmness, durability, high reaction speed, easy communication and the like. Glass in touch screens is an important component, and untreated glass has sharp and defective edges, so that the processing of the glass is greatly focused, and a diamond grinding wheel for processing the glass of the touch screens is generated. The prior art discloses a be used for glass chamfer device, including the workstation, the workstation bottom is provided with the supporting leg, and workstation one side is provided with drive assembly, and the drive assembly top is provided with first motor, and first motor output is provided with the emery wheel, and workstation upper surface middle part is provided with buffer, and buffer top is provided with places the board, places the board upper surface and is provided with glass work piece, and glass work piece both sides are provided with clamping device. However, the prior art has very few researches on a touch screen glass chamfering grinding wheel, and the chamfering wheel for glass has higher requirements on sharpness, diamond holding and service life of the grinding wheel due to larger cutting allowance and higher speed. Conventional bronze grinding wheels are not satisfactory in terms of quality and life.
Disclosure of Invention
The invention adopts a formula of combining nano titanium powder and zirconia to improve the performance, wherein, the copper tin is the basis of a metal matrix, the titanium is a strong carbide forming element, the invention has the functions of greatly improving the wetting of copper to diamond, increasing the holding of the matrix to diamond, stabilizing the zirconia performance, maintaining the stability at high temperature, greatly improving the self-sharpening property of the grinding wheel by adding a small amount of zirconia, having good sharpness and deformation resistance as ceramic material, and greatly prolonging the service life of the grinding wheel after adding the zirconia from practical application.
The invention adopts the following technical scheme:
a chamfering grinding wheel for processing touch screen glass is prepared by cold pressing a metal matrix and a diamond mixture to obtain a cold-pressed blank; sintering and hot-pressing the cold-pressed blank to obtain a chamfering grinding wheel for processing the touch screen glass; further, the chamfering grinding wheel for processing the touch screen glass is obtained through conventional processing after hot pressing. The conventional processing is conventional grinding wheel processing such as slotting, rounding, cutting and the like.
In the invention, the metal matrix consists of copper powder, tin powder, nano titanium powder and zirconia powder; preferably, in the metal matrix, the mass percentage of the copper powder is 55-70%, the tin powder is 15-25%, the nano titanium powder is 7-20%, and the balance is zirconia powder; preferably, the mass percentage of the zirconia powder is 1-7%, preferably 2-5%; further preferably, in the metal matrix, the mass percentage of the copper powder is 60-65%, the mass percentage of the tin powder is 18-23%, the mass percentage of the nano titanium powder is 9-12%, and the balance is the zirconia powder. The metal matrix is a chamfering grinding wheel metal matrix for processing the touch screen glass, is used for preparing the chamfering grinding wheel for processing the touch screen glass by combining with diamond, and has excellent processing performance on the touch screen glass.
In the invention, the granularity of each raw material is as follows: copper powder is 300#, tin powder is 300#, nano titanium powder is 80-100nm, zirconia powder is 15-20 mu m, and diamond: 400-500#.
In the invention, copper powder, tin powder, nano titanium powder and zirconia powder are mixed and ball-milled to obtain a metal matrix, specifically, ball milling is carried out by using big balls and small balls in the presence of alcohol, preferably, the alcohol consumption is 20-30% of the total weight of the copper powder, the tin powder, the nano titanium powder and the zirconia powder, and the mass ratio of the big balls to the small balls is (5-7) to (3-5); during ball milling, the ball-material ratio is (15-25) to 1; the ball milling rotating speed is 300-800 rpm, and the time is 50-200 min.
In the invention, a metal matrix, a low boiling point solvent and diamond are mixed to obtain a metal matrix and diamond mixture; the low boiling point solvent is acetone or alcohol; mixing in the presence of small balls, wherein the ball-material ratio is (15-25) to 1; the mixing time is 30-100 min. Preferably, the volume ratio of the metal matrix to the diamond is (60-70) to (30-40).
In the invention, the cold pressing pressure is 4+/-0.5 t/cm 2 The time is 5-20 s; during sintering, the temperature is raised from room temperature to 350 ℃ at a heating rate of 20-35 ℃/min, and the temperature is kept for 5-10 min; during hot pressing, the temperature is raised from 350 ℃ to 700-750 ℃ at a heating rate of 20-35 ℃/min, the temperature is kept for 60-100 min, and the pressure is applied to 200+/-20 kg/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Sintering is carried out at first, hot pressing is carried out, and sintering is not carried out under pressure.
Glass in touch screens is an important component, and untreated glass has sharp and defective edges, so that the processing of the glass is greatly focused, and a diamond grinding wheel for processing the glass of the touch screens is generated. The chamfering wheel for glass has higher requirements on sharpness, diamond holding and service life of the grinding wheel due to larger cutting allowance and higher speed. Conventional bronze grinding wheels are not satisfactory in terms of quality and life. The invention adopts nano titanium powder and zirconia to improve the performance of copper-tin alloy formulation on the basis of copper powder and tin powder, and titanium is a strong carbide forming element, which has the functions of greatly improving the wetting of copper to diamond and increasing the holding of matrix to diamond. The zirconia has stable performance and can be maintained at high temperature, the self-sharpening property of the grinding wheel is greatly improved by adding a small amount of zirconia, the zirconia as a ceramic material has good sharpness and deformation resistance, and the service life of the grinding wheel can be greatly prolonged after the zirconia is added from the practical application. Compared with the existing chamfering grinding wheel for processing the touch screen glass with good commercial performance, the grinding wheel has the advantages that the service life of a single groove can reach more than 5000m on the basis of edge breakage of less than 30 mu m, and the grinding wheel is remarkably improved.
Drawings
FIG. 1 is a photograph of the quality of a grinding wheel of an embodiment for chamfering soda lime glass of 0.7 mm;
FIG. 2 is a photograph of the quality of a prior art grinding wheel for chamfering 0.7mm soda lime glass.
Detailed Description
The invention adopts the conventional commercial raw materials of copper powder, tin powder, nano titanium powder, zirconia powder and diamond to mix and press, so as to obtain the chamfering grinding wheel for processing the touch screen glass, which is specially used for processing the touch screen glass, in particular chamfering processing, and the service life of a single groove can reach more than 5000m on the basis of edge breakage of less than 30 mu m, thus achieving obvious progress. The specific preparation method and the testing method related by the invention are all in the prior art, and the grinding wheel test is directly carried out on the machine according to the production mode. Copper powder is 300#, tin powder: 300#, nano titanium powder: 80-100nm, zirconia powder: 15-20 μm, diamond: 500#; glass chamfer size 1.5 x 1.5mm; grinding wheel specification: an outer diameter of 100mm, an inner hole of 25.4mm and a thickness of 14mm, and a groove of 3. The processing objects and parameters of the examples are consistent, and the parallel experiments are used for reflecting the improvement of the technical effects of the invention.
Example 1
Accurately weighing 65% of copper powder, 20% of tin powder, 12% of nano titanium powder and 3% of zirconia powder, ball milling the raw materials to form a metal matrix, and mixing the metal matrix and the diamond in a volume ratio of 65% to 35% to prepare a molding material; weighing the molding material, putting the molding material into an existing mold cavity, and performing pressing, sintering, hot press molding and conventional groove type processing to obtain a chamfering grinding wheel for processing the touch screen glass; for 0.7mm soda lime glass chamfering, single groove life can reach 5000m, and plane edge breakage is less than 30 μm, see fig. 1.
The preparation method of the chamfering grinding wheel for processing the touch screen glass comprises the following steps:
(1) Preparing raw materials: sequentially placing precisely weighed copper powder, tin powder, nano titanium powder and zirconia powder into a ball milling tank, carrying out mixed material grinding, adding alcohol (250 g) with the total mass of 25%, then placing WC hard alloy balls, wherein the ball-material ratio is 20:1 (wt.%), the mass ratio of large balls (with the outer diameter of 8 mm) to small balls (with the outer diameter of 2 mm) is 7:3, the rotating speed is 500rpm, mixing for 100min, taking out and drying the materials, and sieving the balls for separation; then placing the powder into a three-dimensional mixer, adding acetone with the mass of 10% of the powder, adding 2mm pellets with the ball-to-material ratio of 20:1, and adding diamond to mix for 60min to obtain a uniformly mixed material;
(2) Pressing: taking the uniformly mixed materials, putting the materials into a die, and controlling the pressure to be 4t/cm 2 Cold pressing for 15s, and demoulding to obtain a cold pressing blank with uniform density;
(3) Sintering and hot pressing: placing the blank body subjected to cold pressing in the step (2) into a hot-pressing sintering mold, then placing into a sintering furnace, heating at a constant pressure and a heating rate of 30 ℃/min, and heating to 350 ℃ at room temperature for 8min; heating to final sintering temperature of 750deg.C at 30deg.C/min, maintaining for 90min, and applying pressure of 200kg/cm 2 。
Groove type processing: the hot-pressed product is electrically processed into a groove according to the drawing, then is arranged in a turning machine, is polished for 30s by 400# oilstone, and is subjected to cutting; the grinding wheel prepared by the method has the characteristic of long service life, and the groove type of the grinding wheel has good retentivity, so that the service life is 1.6 times of that of a conventional grinding wheel.
Example two
Accurately weighing 65% of copper powder, 20% of tin powder, 10% of nano titanium powder and 5% of zirconia powder, and obtaining a chamfering grinding wheel for processing touch screen glass according to the preparation method of the first embodiment; the glass is used for chamfering soda-lime glass with the thickness of 0.7mm, the edge breakage is less than 30 mu m, and the service life of a single groove can reach 4600m.
Example III
Accurately weighing 63.5% of copper powder, 20% of tin powder, 13.5% of nano titanium powder and 3% of zirconia powder, and obtaining a chamfering grinding wheel for processing touch screen glass according to the preparation method of the first embodiment; the chamfering tool is used for chamfering soda-lime glass with the thickness of 0.7mm, the edge breakage is smaller than 35 mu m, and the service life of a single groove can reach 4500m.
Example IV
Accurately weighing 60% of copper powder, 19% of tin powder, 14% of nano titanium powder and 7% of zirconia powder, and obtaining a chamfering grinding wheel for processing touch screen glass according to the preparation method of the first embodiment; the single groove has the advantages that the single groove is used for chamfering soda-lime glass with the thickness of 0.7mm, the edge breakage is smaller than 40 mu m, a small amount of phenomenon larger than 35 mu m exists, and the service life of the single groove can reach 3900m.
Comparative example
The existing chamfering grinding wheel for processing the touch screen glass is used for chamfering soda-lime glass with the thickness of 0.7mm, the edge breakage reaches 60 mu m, the service life of a single groove is 3200m as shown in figure 1, and the chamfering grinding wheel is a good-performance commercial product.
Comparative example one
Accurately weighing 85% of copper-tin alloy powder (76% of copper), 12% of nano titanium powder and 3% of zirconia powder, and obtaining a grinding wheel according to the preparation method of the first embodiment; the chamfering tool is used for chamfering soda-lime glass with the thickness of 0.7mm, the edge breakage reaches 60 mu m, and the service life of a single groove is 2700m.
Accurately weighing 65% of copper powder, 20% of tin powder, 12% of nano titanium powder and 3% of zirconium powder, and obtaining a grinding wheel according to the preparation method of the first embodiment; the chamfering method is used for chamfering soda-lime glass with the thickness of 0.7mm, and the edge breakage exceeds 100 mu m and cannot be applied.
Accurately weighing 65% of copper powder, 20% of tin powder, 12% of nano titanium powder and 3% of alumina powder, and obtaining a grinding wheel according to the preparation method of the first embodiment; the chamfering method is used for chamfering soda-lime glass with the thickness of 0.7mm, and the edge breakage exceeds 100 mu m and cannot be applied.
Accurately weighing 65% of copper powder, 20% of tin powder and 15% of nano titanium powder, and obtaining a grinding wheel according to the preparation method of the first embodiment; the chamfering method is used for chamfering soda-lime glass with the thickness of 0.7mm, and the edge breakage exceeds 100 mu m and cannot be applied.
Accurately weighing 70% of copper powder, 25% of tin powder and 5% of zirconia powder, and obtaining a grinding wheel according to the preparation method of the first embodiment; the chamfering tool is used for chamfering soda-lime glass with the thickness of 0.7mm, the edge breakage reaches 55 mu m, and the service life of a single groove can reach 2250m.
Comparative example two
Accurately weighing 65% of copper powder, 20% of tin powder, 12% of nano titanium powder and 3% of zirconia powder, ball milling the raw materials to form a metal matrix, and mixing the metal matrix with 65% of diamond: mixing 35% by volume of the mixture to prepare a molding material; weighing the molding material, putting the molding material into the existing mold cavity, and performing compression molding, sintering molding (namely, omitting pressurization when the temperature is kept at 750 ℃) and conventional groove type processing to obtain the grinding wheel; the glass chamfering tool is used for chamfering soda-lime glass with the thickness of 0.7mm, the planar edge breakage reaches 45 mu m, and the service life of a single groove can reach 4050m.
The preparation method of the chamfering grinding wheel for processing the touch screen glass comprises the following steps:
(1) Preparing raw materials: sequentially placing precisely weighed copper powder, tin powder, nano titanium powder and zirconia powder into a ball milling tank, carrying out mixed material grinding, adding alcohol (250 g) with the total mass of 25%, then placing WC hard alloy balls, wherein the ball-material ratio is 20:1 (wt.%), the mass ratio of large balls (with the outer diameter of 8 mm) to small balls (with the outer diameter of 2 mm) is 7:3, the rotating speed is 500rpm, mixing for 100min, taking out and drying the materials, and sieving the balls for separation; then placing the powder into a three-dimensional mixer, adding acetone with the mass of 10% of the powder, adding 2mm pellets with the ball-to-material ratio of 20:1, and adding diamond to mix for 60min to obtain a uniformly mixed material;
(2) Pressing: taking the uniformly mixed materials, putting the materials into a die, and controlling the pressure to be 4t/cm 2 Cold pressing for 15s, and demoulding to obtain a cold pressing blank with uniform density;
(3) Sintering and hot pressing: placing the blank body subjected to cold pressing in the step (2) into a hot-pressing sintering mold, then placing into a sintering furnace, heating at a constant pressure and a heating rate of 30 ℃/min, and heating to 350 ℃ at room temperature for 8min; heating to the final sintering temperature of 750 ℃ at 30 ℃/min, and preserving heat for 90min.
The groove processing is the same as the embodiment.
Example five
Accurately weighing 65% of copper powder, 21% of tin powder, 11% of nano titanium powder and 3% of zirconia powder, ball milling the raw materials to form a metal matrix, and mixing the metal matrix and diamond in a volume ratio of 68% to 32% to prepare a molding material; and weighing the molding material, putting the molding material into an existing mold cavity, and performing pressing, sintering, hot press molding and conventional groove type processing to obtain the chamfering grinding wheel for processing the touch screen glass. The preparation method of the chamfering grinding wheel for processing the touch screen glass comprises the following steps:
(1) Preparing raw materials: sequentially placing precisely weighed copper powder, tin powder, nano titanium powder and zirconia powder into a ball milling tank, mixing and grinding, adding alcohol (250 g) with the total mass of 25%, then placing WC hard alloy balls, wherein the ball-material ratio is 20:1 (wt.%), the mass ratio of large balls (with the outer diameter of 8 mm) to small balls (with the outer diameter of 2 mm) is 6:4, the rotating speed is 600rpm, mixing for 80min, taking out and drying the materials, and sieving the balls for separating; then placing the powder into a three-dimensional mixer, adding acetone with the mass of 10% of the powder, adding 2mm pellets with the ball-to-material ratio of 20:1, and adding diamond to mix for 60min to obtain a uniformly mixed material;
(2) Pressing: taking the uniformly mixed materials, putting the materials into a die, and controlling the pressure to be 4t/cm 2 Cold pressing for 18s, and demoulding to obtain a cold pressing blank with uniform density;
(3) Sintering and hot pressing: placing the blank body subjected to cold pressing in the step (2) into a hot-pressing sintering mold, then placing into a sintering furnace, heating at a constant pressure and a heating rate of 30 ℃/min, and heating to 350 ℃ at room temperature for 10min; heating to final sintering temperature of 750deg.C at 30deg.C/min, maintaining for 100min, and applying pressure of 200kg/cm 2 。
Groove type processing: the hot-pressed product is electrically processed into a groove according to the drawing, then is arranged in a turning machine, is polished for 30s by 400# oilstone, and is subjected to cutting; the grinding wheel prepared by the method has the characteristics of long service life and good groove type retentivity.
The prior art has little research on grinding wheels for chamfering touch screen glass, and the edge breakage and the processing life of several grinding wheels on the market need to be improved. The applicant has disclosed the grinding wheel aiming at processing sapphire glass and photovoltaic glass before, have good application effect, but there are differences in hardness and brittleness, find that these grinding wheels can not be used for processing touch screen glass through practical production practice, the difference of materials causes the processing effect to be very bad, for example the processing of photovoltaic glass is measured in tens of thousands of meters, and the processing of touch screen glass is measured in thousands of meters; in order to improve the performance of the existing chamfering grinding wheel for the touch screen glass, the applicant adopts conventional commercial raw materials of copper powder, tin powder, nano titanium powder, zirconia powder and diamond to carry out mixed pressing, so as to obtain the chamfering grinding wheel for the touch screen glass, which is specially used for processing the touch screen glass, particularly for chamfering, wherein the service life of a single groove can reach more than 4000m and optimally reach 5000m on the basis of the edge breakage of less than 30 mu m, and obvious progress is achieved.
Claims (5)
1. The preparation method of the chamfering grinding wheel for processing the touch screen glass is characterized by mixing and ball milling copper powder, tin powder, nano titanium powder and zirconia powder to obtain a metal matrix; cold pressing the metal matrix and the diamond mixture to obtain a cold-pressed blank; sintering and hot-pressing the cold-pressed blank to obtain a chamfering grinding wheel for processing the touch screen glass; in the metal matrix, the mass percentage of copper powder is 60-65%, the mass percentage of tin powder is 18-23%, the mass percentage of nano titanium powder is 9-12%, and the balance is zirconia powder; the cold pressing pressure is 4+/-0.5 t/cm 2 The time is 5-20 s; during sintering, the temperature is raised from room temperature to 350 ℃ at a heating rate of 20-35 ℃/min, and the temperature is kept for 5-10 min; during hot pressing, the temperature is raised from 350 ℃ to 700-750 ℃ at a heating rate of 20-35 ℃/min, the temperature is kept for 60-100 min, and the pressure is applied to 200+/-20 kg/cm 2 。
2. The method for manufacturing a chamfering grinding wheel for touch screen glass processing according to claim 1, wherein the mass percentage of the zirconia powder is 1-7%.
3. The method for manufacturing a chamfering grinding wheel for touch screen glass processing according to claim 1, wherein ball milling is performed with large balls and small balls in the presence of a low boiling point organic solvent; during ball milling, the ball-material ratio is (15-25) to 1; the ball milling rotating speed is 300-800 rpm, and the time is 50-200 min.
4. The method for manufacturing a chamfering grinding wheel for touch screen glass processing according to claim 3, wherein the metal matrix, the low boiling point solvent and the diamond are mixed to obtain a metal matrix and diamond mixture; the volume ratio of the metal matrix to the diamond is (60-70) to (30-40).
5. The use of the chamfering grinding wheel for processing the touch screen glass prepared by the preparation method according to claim 1 in processing the touch screen glass.
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