CN111041262B - TFT touch screen grinding rod and preparation method thereof - Google Patents
TFT touch screen grinding rod and preparation method thereof Download PDFInfo
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- CN111041262B CN111041262B CN201911419899.XA CN201911419899A CN111041262B CN 111041262 B CN111041262 B CN 111041262B CN 201911419899 A CN201911419899 A CN 201911419899A CN 111041262 B CN111041262 B CN 111041262B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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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
- B22F3/16—Both compacting and sintering in successive or repeated steps
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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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- 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
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
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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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- Metallurgy (AREA)
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- Powder Metallurgy (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses a TFT touch screen grinding rod and a preparation method thereof, wherein copper powder, tin powder, cobalt powder, silver powder and cerium powder are mixed and then subjected to ball milling to obtain a metal matrix, and the metal matrix is mixed with diamond to obtain a material; and cold pressing the materials to obtain a blank, and performing hot-pressing sintering on the blank to obtain the TFT touch screen grinding rod. The TFT touch screen grinding rod prepared by the invention has the characteristics of strong holding force, high sharpening degree, long service life and the like, can meet the grinding requirement of the TFT touch screen, can increase the speed from conventional 250mm/min to 350mm/min, improves the working efficiency by 140%, has stable quality in batch use, and does not have the phenomenon of sparking; the preparation method disclosed by the invention is simple, has wide raw material sources, and is suitable for modern industrial production.
Description
Technical Field
The invention belongs to a grinding rod technology, and particularly relates to a TFT touch screen grinding rod and a preparation method thereof.
Background
The grinding rod for chamfering the touch screen glass is mostly manufactured by adopting a metal sintering and electroplating method, the requirements on the processing speed, the feed amount and the quality are higher and higher, the grinding rod manufactured by the electroplating method is gradually replaced by the metal sintering method, the grinding rod manufactured by the metal sintering method of various manufacturers at present mostly adopts copper-cobalt-tin or copper-iron-tin, the requirements of a part of middle and low-end products can be met, but the requirements on a mobile phone screen or a computer screen of a high-end client are much higher, and a screen processed by the conventional grinding rod has internal stress, so that the screen has light leakage points.
Disclosure of Invention
The grinding rod manufactured according to the invention is successfully guided into a customer, helps solve the problem of light leakage during screen edge grinding, has a service life longer than that of the existing product, has a price only 80% of that of the existing product, and has high quality and cost performance.
The invention adopts the following technical scheme:
the preparation method of the TFT touch screen grinding rod comprises the following steps:
(1) mixing metal powder and then performing ball milling to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder, silver powder and cerium powder;
(2) mixing the metal matrix with the diamond to obtain a material;
(3) cold pressing the materials to obtain a blank;
(4) and (5) carrying out hot-pressing sintering on the blank to obtain the TFT touch screen grinding rod.
In the technical scheme, according to the mass percentage, the metal powder comprises 20-30% of tin powder, 20-30% of cobalt powder, 3-10% of silver powder, 1.5-2% of cerium powder and the balance of copper powder; the technical scheme of the invention adopts high cobalt powder content, silver powder and cerium powder are added, the high cobalt powder content is beneficial to increasing the sharpness of the grinding rod, the particle size of the cobalt powder is preferably 1-3 mu m, and the cobalt powder has good reaction activity and can not increase the sintering temperature due to the fine particle size; the silver powder is added, so that the heat conductivity of the grinding rod is increased, the high-speed rotating grinding temperature of the grinding rod is reduced, meanwhile, the silver has good rigidity, and the groove-shaped holding capacity of the grinding rod is increased; the metal cerium has the effects of reducing the melting point and the solid-liquid phase temperature of the alloy, deoxidizing, desulfurizing, denitrifying and the like, inhibiting the fineness of oxygen, sulfur and nitrogen, refining crystal grains, promoting the formation of substructures, purifying a matrix alloy interface, particularly reducing the concentration of oxygen, sulfur and nitrogen at the interface, improving fracture tissues and strengthening and toughening effects.
In the technical scheme, the particle diameters of the copper powder, the tin powder, the silver powder and the cerium powder are independently selected from 1-12 mu m.
In the technical scheme, during ball milling, the rotating speed is 400 revolutions per minute, and the time is 15-20 minutes; mixing the metal matrix and the diamond in a mixer for 100-150 minutes, then sieving, and taking undersize to obtain a material; preferably, the sieve is a 120 mesh sieve, i.e., a 120 micron sieve.
In the technical scheme, the pressure of cold pressing is 2.8-3.2 tons/cm2The pressure maintaining time is 5-30 second; the pressure of hot-pressing sintering is 1.8-2.2 tons/cm2The temperature is 650-750 ℃, and the heat preservation time is 60-100 minutes.
The TFT touch screen grinding rod provided by the invention has good processing appearance, has the characteristics of strong holding force, higher sharpening degree and longer service life on the premise of meeting the processing quality, and can meet the processing requirements of TFT touch screens.
The invention has the advantages that:
the TFT touch screen grinding rod prepared by the formula has the characteristics of strong holding force, high sharpening degree, long service life and the like, can meet the grinding requirement of the TFT touch screen, can increase the speed from conventional 250mm/min to 350mm/min, improves the working efficiency by 140 percent, has stable quality in batch use, and has no sparking phenomenon; the preparation method disclosed by the invention is simple, has wide raw material sources, and is suitable for modern industrial production; in the preparation method, particles are not easy to agglomerate, powder is better in fluidity and more uniform in mixing, the prepared TFT touch screen grinding rod is uniform in structure and stable in performance, and the quality of the TFT touch screen grinding rod among batches is easier to control and stabilize.
Drawings
FIG. 1 is a photograph of a touch screen glass surface processed by a grinding rod (group 1) prepared by the method of the present invention;
FIG. 2 is a photograph of a touch screen glass surface processed by a grinding rod (group 2) prepared by the method of the present invention;
FIG. 3 is a photograph of the surface of a touch screen glass processed by a grinding rod (group 3) prepared by the method of the present invention;
FIG. 4 is a photograph of a touch screen glass surface processed by a grinding rod (group 4) prepared by the method of the present invention;
FIG. 5 is a photograph of a surface of a touch screen glass processed by a grinding bar (group 4, 350mm/min, 5 ten thousand rpm) prepared according to an embodiment of the present invention;
FIG. 6 is a photograph of a surface of a touch screen glass processed by a grinding bar (group 7, 350mm/min, 5 ten thousand rpm) prepared according to an example of the present invention;
FIG. 7 is a photograph of a surface of a touch screen glass processed by a conventional grinding bar (350 mm/min, 5 ten thousand rpm).
Detailed Description
The preparation method of the metal matrix comprises the steps of mixing copper powder, tin powder, cobalt powder, silver powder and cerium powder and then carrying out ball milling to obtain the metal matrix, wherein the metal matrix comprises, by mass, 20-30% of tin powder, 20-30% of cobalt powder, 3-10% of silver powder, 1.5-2% of cerium powder and the balance of copper powder.
The preparation method of the TFT touch screen grinding rod blank comprises the steps of mixing copper powder, tin powder, cobalt powder, silver powder and cerium powder, then carrying out ball milling to obtain a metal matrix, and mixing the metal matrix with diamond to obtain a material; and (5) cold pressing the materials to obtain a blank.
The preparation method of the TFT touch screen grinding rod disclosed by the invention comprises the following steps:
(1) mixing metal powder and then performing ball milling to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder, silver powder and cerium powder;
(2) mixing the metal matrix with the diamond to obtain a material;
(3) cold pressing the materials to obtain a blank;
(4) and (5) carrying out hot-pressing sintering on the blank to obtain the TFT touch screen grinding rod.
Examples
Mixing materials: adding metal powder into a ball mill according to the formula requirements of the mass percentage ratio in Table 1, adding alcohol accounting for 30% of the total mass of the metal powder, then adding zirconium balls, mixing the metal powder and the zirconium balls according to the ball-to-material ratio of 2:1 (wt%) at the rotating speed of 400 r/min, carrying out ball milling for 20 minutes, taking out the materials, drying the materials, then putting the materials into a V-type mixer, adding acetone accounting for 10% of the total mass of the metal powder, then adding diamond accounting for 20% of the total mass of the metal powder, mixing the materials for 120 minutes, drying the materials, and then sieving the materials through a 120# sieve (120 micrometers;
pressing: adding the materials into the existing mold, placing on a hydraulic press, and applying pressure of 3 ton/cm2Keeping the pressure for 10 seconds; then the mold is turned upside down, and a pressure of 3 tons/cm is applied2Maintaining the pressure for 10 seconds to prepare a cold-pressed blank with uniform density;
sintering and forming: by hot-pressing sintering, i.e.Applying pressure during sintering at 2 ton/cm2Heating from room temperature to the final sintering temperature of 700 ℃ at a speed of 10 ℃/min, preserving the heat for 80 minutes, cooling to 100 ℃ along with the furnace, discharging, taking out and carrying out conventional processing;
groove type processing: and (4) electrically machining the groove according to the drawing, then placing the groove on a lathe, polishing the groove for 30 seconds by using No. 1200 red oilstone, and performing edging to obtain the TFT touch screen grinding rod.
The particle size of the cobalt powder is 1-3 mu m, the particle size of the copper powder is 5-12 mu m, the particle size of the tin powder is 5-10 mu m, the particle size of the silver powder is 1-5 mu m, the particle size of the cerium powder is 3-8 mu m, and the particle size of the diamond is 5-10 mu m.
The weight sum of all groups of metal powder is 100%, wherein the particle size of the 5 th group of cobalt powder is 15-25 mu m, and the group 8 replaces cerium powder with titanium powder with the particle size of 5-10 mu m; the feeding rate and the processing speed in table 1 are the maximum parameters for maintaining the processing quality without light leakage points and scratches, and if the parameters are increased, processing defects such as scratches and light leakage points occur.
The grinding rod prepared by the method has the characteristics of good sharpness and long service life, and the bonding agent has strong holding force on diamond, so that the groove type retentivity is good, the service life is 1.4 times of that of the existing TFT touch screen grinding rod (Seal) in a conventional test, the price is only 80% of that of the existing product, the quality and the cost performance are high, the processing rotating speed of the existing TFT touch screen grinding rod for grinding 2.5D touch screen glass is 45000rpm, the feeding speed is 250mm/min, the surface of the glass is scratched mostly, and light leakage points on the screen can be caused; the feed rate of groups 4 to 6 increased to 350mm/min, which resulted in scratching.
FIG. 1 is an effect diagram of a group 1TFT touch screen grinding rod after processing 2.5D touch screen glass; FIG. 2 is an effect diagram of a 2.5D touch screen glass processed by a group 2TFT touch screen grinding rod; FIG. 3 is an effect diagram of a group 3TFT touch screen grinding rod after processing 2.5D touch screen glass; FIG. 4 is an effect diagram of a 4TFT touch screen grinding rod after processing 2.5D touch screen glass; FIG. 5 is a diagram of the effect of a 4-group TFT touch screen grinding rod after processing 2.5D touch screen glass (the feed rate is increased to 350mm/min, and the rotation speed is increased to 5 ten thousand); FIG. 6 is a diagram showing the effect of the 7-group TFT touch screen grinding rod after processing 2.5D touch screen glass (the feed rate is increased to 350mm/min, and the rotation speed is increased to 5 ten thousand); FIG. 7 is a diagram showing the effect of a conventional TFT touch screen grinding rod (Seal) after processing 2.5D touch screen glass (the feed rate is increased to 350mm/min, and the rotation speed is increased to 5 ten thousand). The simple comparison shows that the technical effects of increasing the feeding speed to 350mm/min and increasing the rotating speed to 50000rpm can be realized under the high quality of no light leakage point and no scratch when the same workpiece is processed, and the method is not obvious.
Claims (5)
- The TFT touch screen grinding rod is characterized in that the preparation method of the TFT touch screen grinding rod comprises the following steps:(1) mixing metal powder and then performing ball milling to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder, silver powder and cerium powder;(2) mixing the metal matrix with the diamond to obtain a material;(3) cold pressing the materials to obtain a blank;(4) carrying out hot-pressing sintering on the green body to obtain a TFT touch screen grinding rod;according to the mass percentage, the metal powder comprises 25 percent of tin powder, 25 percent of cobalt powder, 6 percent of silver powder, 1.5 percent of cerium powder and the balance of copper powder; or 22% of tin powder, 25% of cobalt powder, 4% of silver powder, 2% of cerium powder and the balance of copper powder; or 28% of tin powder, 25% of cobalt powder, 8% of silver powder, 2% of cerium powder and the balance of copper powder;the particle size of the cobalt powder is 1-3 mu m; the particle diameters of the copper powder, the tin powder, the silver powder and the cerium powder are independently selected from 1-12 mu m.
- 2. The TFT touch screen grinding rod of claim 1, wherein during ball milling, the rotation speed is 400 rpm, and the time is 15-20 minutes; and mixing the metal matrix and the diamond in a mixer for 100-150 minutes, then sieving, and taking undersize to obtain the material.
- 3. The TFT touch screen grinding rod of claim 2, wherein the screen is a 120 mesh screen.
- 4. Use of the TFT touch screen grinding rod of claim 1 in processing touch screen glass.
- 5. The use according to claim 4, wherein the feed rate is 350mm/min and the rotation speed is 50000rpm when processing touch screen glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419899.XA CN111041262B (en) | 2019-12-31 | 2019-12-31 | TFT touch screen grinding rod and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911419899.XA CN111041262B (en) | 2019-12-31 | 2019-12-31 | TFT touch screen grinding rod and preparation method thereof |
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| CN111041262A CN111041262A (en) | 2020-04-21 |
| CN111041262B true CN111041262B (en) | 2021-07-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112756614B (en) * | 2020-12-31 | 2022-11-01 | 苏州赛尔科技有限公司 | Grinding wheel for processing hard brittle sapphire glass and preparation method thereof |
| CN113025284B (en) * | 2021-03-12 | 2021-08-20 | 中国矿业大学 | Medium-high temperature nano composite metal phase change heat storage material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102848304A (en) * | 2012-08-23 | 2013-01-02 | 镇江丰成特种工具有限公司 | Special grinding wheel for solar photovoltaic glass and manufacturing method of special grinding wheel |
| CN103846759A (en) * | 2012-11-30 | 2014-06-11 | 株式会社则武 | Machining tool for thin sheet glass and method of manufacturing the same |
| CN104227574A (en) * | 2014-08-04 | 2014-12-24 | 江苏美杰磨具科技有限公司 | Grinding wheel for machining ultrathin glass and preparation method thereof |
| CN109365827A (en) * | 2018-10-31 | 2019-02-22 | 广东奔朗新材料股份有限公司 | One kind is dry to cut diamond saw blade and preparation method thereof |
-
2019
- 2019-12-31 CN CN201911419899.XA patent/CN111041262B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102848304A (en) * | 2012-08-23 | 2013-01-02 | 镇江丰成特种工具有限公司 | Special grinding wheel for solar photovoltaic glass and manufacturing method of special grinding wheel |
| CN103846759A (en) * | 2012-11-30 | 2014-06-11 | 株式会社则武 | Machining tool for thin sheet glass and method of manufacturing the same |
| CN104227574A (en) * | 2014-08-04 | 2014-12-24 | 江苏美杰磨具科技有限公司 | Grinding wheel for machining ultrathin glass and preparation method thereof |
| CN109365827A (en) * | 2018-10-31 | 2019-02-22 | 广东奔朗新材料股份有限公司 | One kind is dry to cut diamond saw blade and preparation method thereof |
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