CN111015539B - Grinding wheel for processing photovoltaic glass and preparation method thereof - Google Patents
Grinding wheel for processing photovoltaic glass and preparation method thereof Download PDFInfo
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- CN111015539B CN111015539B CN201911419896.6A CN201911419896A CN111015539B CN 111015539 B CN111015539 B CN 111015539B CN 201911419896 A CN201911419896 A CN 201911419896A CN 111015539 B CN111015539 B CN 111015539B
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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
- B24D3/346—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 utilised during polishing, or grinding operation
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Abstract
The invention discloses a grinding wheel for processing photovoltaic glass and a preparation method thereof, wherein copper powder, tin powder, cobalt powder and chromium powder are mixed and then are 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 sintering and hot forging the blank to obtain the grinding wheel for processing the photovoltaic glass. The grinding wheel for processing the photovoltaic glass, which is prepared by the formula provided by the invention, has the characteristics of strong holding force, good sharpness, long service life and the like, can meet the processing requirements of the photovoltaic glass, can be used for cutting the photovoltaic glass with the thickness of 3.5mm, the edge breakage is less than 20 micrometers, and the cutting life of a blade can reach 50000 m.
Description
Technical Field
The invention belongs to the technical field of grinding wheels, and particularly relates to a grinding wheel for processing photovoltaic glass and a preparation method thereof.
Background
Crystalline silicon solar cells are rapidly developed, but monocrystalline silicon has poor mechanical properties, is easily damaged, and is easily corroded. Therefore, photovoltaic glass is generally used for packaging, so that the battery is protected, and the service life is prolonged. The processing of photovoltaic glass has therefore attracted considerable attention, with diamond grinding wheels being in force. The photovoltaic glass edge grinding wheel mainly adopts copper tin iron nickel as a matrix formula, the formula is modified by adding iron nickel on the basis of the copper tin formula, the copper iron nickel is used as a framework, tin powder with a low melting point is used as a binder, iron and diamond have good wettability, the contact angle is 50 degrees and far better than that of copper, nickel has good wear resistance and toughness and is infinitely mutually soluble with copper, sintering loss of metal tin with the low melting point in the copper iron-based formula can be reduced, the matrix formula has fatal defects and poor sharpness, the using quality of the grinding wheel is unstable, edge breakage caused by poor chip removal often occurs, and certain trouble is caused to manufacturers due to insufficient sharpness and limited processing speed.
Disclosure of Invention
The invention modifies the existing formula, creatively adopts cobalt and chromium powder to modify the copper-tin formula, can greatly improve the wetting of copper to diamond by adding a small amount, increases the holding of a matrix to the diamond, can improve the bending strength of the matrix, avoids the situation that the grinding wheel is not sharp due to the addition of iron in the prior art, has good sharpness and deformation resistance, and can greatly improve the service life of the grinding wheel after the cobalt and chromium are added in view of practical application.
The invention adopts the following technical scheme:
a grinding wheel for processing photovoltaic glass is prepared by the following steps:
(1) mixing and ball-milling metal powder to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder and chromium powder;
(2) mixing the metal matrix with the diamond to obtain a material;
(3) cold pressing the materials to obtain a blank;
(4) and sintering and hot forging the blank to obtain the grinding wheel for processing the photovoltaic glass.
According to the invention, according to the mass percentage, in the metal powder, 20-30% of tin powder, 10-30% of cobalt powder, 1-5% of chromium powder and the balance of copper powder are used; according to the invention, the bending strength of the tire body can be improved by adding the cobalt powder and the chromium powder, the condition that the grinding wheel is not sharp due to the addition of iron in the prior art is avoided, the prepared grinding wheel has good sharpness and deformation resistance, and the service life of the grinding wheel is greatly prolonged by the preparation method of the invention from the practical application.
In the technical scheme, during ball milling, the rotating speed is 500rpm, and the time is 90-110 minutes; mixing the metal matrix and the diamond in a mixer for 50-70 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 invention, the volume ratio of the metal matrix to the diamond is 75: 25.
in the technical scheme, the pressure of cold pressing is 3.8-4.2 tons/cm2The pressure maintaining time is 5-30 seconds; the sintering is that the temperature is raised from room temperature to 300-350 ℃ at the speed of 20-35 ℃/min, the temperature is kept for 5-10 min, then the temperature is raised to 700-750 ℃ at the speed of 10-15 ℃/min, and the temperature is kept for 60-100 min; the pressure of hot forging is1.8 to 2.2 tons/cm2The time is 15-25 s; according to the invention, the sintered blank is directly taken out of the sintering furnace without being cooled, and is placed on a hot press for hot forging, so that the sharpness of the grinding wheel is improved.
The grinding wheel for processing the photovoltaic glass, provided by the invention, has the characteristics of good processing appearance, strong holding force, good sharpness and longer service life on the premise of meeting the processing quality, and can meet the requirements of processing and cutting the photovoltaic glass.
The invention has the advantages that:
the grinding wheel for processing the photovoltaic glass, which is prepared by the formula, has the characteristics of strong holding force, good sharpness, long service life and the like, can meet the processing requirements of the photovoltaic glass, can cut the photovoltaic glass with the thickness of 3.5mm, the edge breakage is less than 20 micrometers, the cutting life of a blade can reach 50000m, the quality of batch use is stable, and the phenomenon of sparking is avoided; 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, the particles are not easy to agglomerate, the powder has better fluidity and is more uniformly mixed, the prepared grinding wheel for processing the photovoltaic glass has uniform tissue and stable performance, and the quality among batches of the grinding wheels for processing the photovoltaic glass is easier to control and stabilize.
Drawings
FIG. 1 is a photograph of a glass surface processed with a grinding wheel for photovoltaic glass processing prepared by the method of the present invention;
FIG. 2 is a photograph of the surface of the glass processed by the grinding wheel for photovoltaic glass processing prepared by the method of the present invention;
FIG. 3 is a photograph of a glass surface processed with a grinding wheel for photovoltaic glass processing prepared in accordance with an embodiment of the present invention;
FIG. 4 is a photograph of a glass surface processed with a grinding wheel for photovoltaic glass processing prepared in accordance with an embodiment of the present invention;
fig. 5 is a photograph of a glass surface processed by a grinding wheel for photovoltaic glass processing in the prior art.
Detailed Description
The preparation method of the metal matrix comprises the steps of mixing copper powder, tin powder, cobalt powder and chromium powder and then carrying out ball milling to obtain the metal matrix, wherein the metal matrix comprises, by mass, 20-30% of tin powder, 10-30% of cobalt powder, 1-5% of chromium powder and the balance copper powder.
The invention discloses a preparation method of a grinding wheel blank for processing photovoltaic glass, which comprises the steps of mixing copper powder, tin powder, cobalt powder and chromium 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 invention discloses a preparation method of a grinding wheel for processing photovoltaic glass, which comprises the following steps:
(1) mixing and ball-milling metal powder to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder and chromium powder;
(2) mixing the metal matrix with the diamond to obtain a material;
(3) cold pressing the materials to obtain a blank;
(4) and sintering and hot forging the blank to obtain the grinding wheel for processing the photovoltaic glass.
Examples
Mixing materials: adding metal powder into a ball mill according to the formula requirement of mass percentage ratio, adding alcohol accounting for 25% of the total mass of the metal powder, then adding zirconium balls, wherein the ball-material ratio is 2:1 (wt%), the rotating speed is 500 r/min, mixing, carrying out ball milling for 100 min, taking out the materials, drying, then putting into a V-type mixer, adding acetone accounting for 10% of the total mass of the metal powder, mixing for 120 min, then adding diamond (the volume ratio of a metal matrix body to the diamond is 75: 25), mixing for 60 min, drying, and then sieving by a 120# sieve (120 microns) to obtain a uniformly mixed material;
pressing: adding the materials into the existing mold, placing on a hydraulic press, and applying pressure of 4 ton/cm2Keeping the pressure for 10 seconds; then the mold is turned upside down, and a pressure of 4 tons/cm is applied2Maintaining the pressure for 10 seconds to prepare a cold-pressed blank with uniform density;
sintering and forming: adopting sectional sintering, heating from room temperature to 350 deg.C at 30 deg.C/min, holding for 10min, heating from 350 deg.C to final sintering temperature of 700 deg.C at 25 deg.C/min, holding for 80 min, cooling, taking out, and sinteringThe resulting green body was placed on a hot press and hot forged (2 tons/cm)2And 20 s), improving the sharpness of the grinding wheel, naturally cooling and then performing conventional processing;
groove type processing: electrically processing the groove according to the drawing, then placing the groove in a lathe, polishing the groove for 30s by using 1000# oilstone, and edging; the grinding wheel prepared by the method has the characteristic of long service life, and the service life is 2 times that of the conventional grinding wheel because the bonding agent has strong holding force on the diamond and the groove type retention property is good.
The particle size of the cobalt powder is 5-10 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 chromium powder is 5-15 mu m, and the particle size of the diamond is 5-10 mu m.
The following provides different metal powder ratios to specifically explain the technical scheme of the invention, and the preparation method is as above.
According to the mass percentage, 57 percent of copper powder, 28 percent of tin powder, 11.5 percent of cobalt powder and 3.5 percent of chromium powder are accurately weighed to prepare a metal matrix, and then the metal matrix and diamond are mixed in a ratio of 75: 25, mixing the prepared materials according to the volume ratio, putting the materials into a die cavity, and performing pressing, sintering, hot forging and groove type processing to obtain the grinding wheel for processing the photovoltaic glass; when the photovoltaic glass with the thickness of 3.5mm is cut conventionally, the edge breakage is less than 22 micrometers, the cutting life of a blade can reach 49000m, and fig. 1 shows a photo of the surface of the glass (when the processing length is 49000 m) processed by the grinding wheel for processing the photovoltaic glass.
Accurately weighing 50% of copper powder, 22% of tin powder, 25% of cobalt powder and 3% of chromium powder according to mass percent to prepare a metal matrix, and mixing the metal matrix with diamond according to a weight ratio of 75: 25, mixing the prepared materials according to the volume ratio, putting the materials into a die cavity, and performing pressing, sintering, hot forging and groove type processing to obtain the grinding wheel for processing the photovoltaic glass; the photovoltaic glass with the thickness of 3.5mm is cut conventionally, the edge breakage is less than 20 micrometers, and the cutting life of a blade can reach 49000 m.
Accurately weighing 52% of copper powder, 25% of tin powder, 20% of cobalt powder and 3% of chromium powder according to mass percent to prepare a metal matrix, and mixing the metal matrix with diamond according to a weight ratio of 75: 25, mixing the prepared materials according to the volume ratio, putting the materials into a die cavity, and performing pressing, sintering, hot forging and groove type processing to obtain the grinding wheel for processing the photovoltaic glass; when the photovoltaic glass with the thickness of 3.5mm is cut conventionally, the edge breakage is less than 20 micrometers, the cutting life of a blade can reach 50000m, and fig. 2 shows a photo of the surface of the glass (when the processing length is 50000 m) processed by the grinding wheel for processing the photovoltaic glass.
Accurately weighing 55% of copper powder, 25% of tin powder and 20% of cobalt powder according to mass percent to prepare a metal matrix, and mixing the metal matrix with diamond according to a weight ratio of 75: 25, mixing the prepared materials according to the volume ratio, putting the materials into a die cavity, and performing pressing, sintering, hot forging and groove type processing to obtain the grinding wheel for processing the photovoltaic glass; the edge breakage of the photovoltaic glass with the thickness of 3.5mm is smaller than 40 mu m when the photovoltaic glass is cut conventionally, the cutting service life of a blade can reach 45000m, and fig. 3 shows a photo of the surface of the glass processed by the grinding wheel for processing the photovoltaic glass (when the processing length is 46000 m).
Accurately weighing 65% of copper powder, 25% of tin powder, 5% of cobalt powder and 5% of chromium powder according to mass percent to prepare a metal matrix, and mixing the metal matrix with diamond according to a weight ratio of 75: 25, mixing the prepared materials according to the volume ratio, putting the materials into a die cavity, and performing pressing, sintering, hot forging and groove type processing to obtain the grinding wheel for processing the photovoltaic glass; when the photovoltaic glass with the thickness of 3.5mm is cut conventionally, the edge breakage is less than 30 micrometers, the cutting life of a blade can reach 47000m, and fig. 4 shows a photo of the surface of the glass (when the processing length is 48000 m) processed by the grinding wheel for processing the photovoltaic glass.
Accurately weighing 50% of copper powder, 25% of tin powder, 20% of cobalt powder and 5% of iron powder (the particle size is 5-10 mu m) according to the mass percentage to prepare a metal matrix, and mixing the metal matrix with diamond according to the weight ratio of 75: 25, mixing the prepared materials according to the volume ratio, putting the materials into a die cavity, and performing pressing, sintering, hot forging and groove type processing to obtain the grinding wheel for processing the photovoltaic glass; the edge breakage of the conventionally cut photovoltaic glass with the thickness of 3.5mm is less than 45 microns, and the cutting life of the blade can reach 44000 m.
The existing metal diamond grinding wheel (Seal) for processing photovoltaic glass is used for conventionally cutting photovoltaic glass with the thickness of 3.5mm, the edge breakage is less than 30 mu m, the cutting service life of a blade can reach 40000m, and fig. 5 shows that the processing quality does not meet the standard and the edge breakage is less than 55 mu m when the surface photo of the glass processed by the existing grinding wheel for processing photovoltaic glass (the processing length is 41000 m).
The cutting life of the blade is the maximum value under the condition of keeping the processing quality of the photovoltaic glass, and if the cutting life of the blade is increased, processing defects such as scratches, edge breakage and the like occur; the processing parameters are conventional technologies, and the service life and the processing quality of the grinding wheel are improved; the edge breakage less than 20 microns means that the maximum edge breakage is not more than 20 microns (edge breakage close to 20 microns exists), the edge breakage less than 30 microns means that edge breakage of 30 microns exists, and the rest is analogized in the same way, and the conventional characteristics are obtained.
The grinding wheel for processing the photovoltaic glass, which is prepared according to the method disclosed by the invention, has the characteristics of good sharpness and long service life, and as the binding agent has strong holding force on diamond, the groove type retentivity is good, the service life is 1.25 times that of the conventional grinding wheel for processing the photovoltaic glass through conventional tests, the grinding wheel has higher quality and cost performance, and the workpiece processed by the grinding wheel disclosed by the invention has good quality.
Claims (6)
1. The grinding wheel for processing the photovoltaic glass is characterized by comprising the following steps:
(1) mixing and ball-milling metal powder to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder and chromium powder; according to the mass percentage, the metal powder comprises 20-30% of tin powder, 10-30% of cobalt powder, 1-5% of chromium powder and the balance of copper powder;
(2) mixing the metal matrix with the diamond to obtain a material;
(3) cold pressing the materials to obtain a blank;
(4) and sintering and hot forging the blank to obtain the grinding wheel for processing the photovoltaic glass.
2. The grinding wheel for processing photovoltaic glass according to claim 1, wherein the rotation speed is 500rpm and the time is 90-110 minutes during ball milling; and mixing the metal matrix and the diamond in a mixer for 50-70 minutes, then sieving, and taking undersize materials to obtain the material.
3. The grinding wheel for processing photovoltaic glass according to claim 1, wherein the pressure of cold pressing is 3.8-4.2 tons/cm2The pressure maintaining time is 5-30 seconds; the sintering is carried out by heating from room temperature to 300-350 ℃ at a speed of 20-35 ℃/min, preserving heat for 5-10 min, heating to 700-750 ℃ at a speed of 10-15 ℃/min, and preserving heat for 60-100 min.
4. The grinding wheel for processing photovoltaic glass according to claim 1, wherein the pressure of hot forging is 1.8 to 2.2 tons/cm2The time is 15-25 s.
5. The grinding wheel green body for processing the photovoltaic glass is characterized by comprising the following steps:
(1) mixing and ball-milling metal powder to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder and chromium powder; according to the mass percentage, the metal powder comprises 20-30% of tin powder, 10-30% of cobalt powder, 1-5% of chromium powder and the balance of copper powder;
(2) mixing the metal matrix with the diamond to obtain a material;
(3) and (4) cold pressing the materials to obtain the grinding wheel blank for processing the photovoltaic glass.
6. The grinding wheel material for photovoltaic glass processing is characterized by comprising the following steps:
(1) mixing and ball-milling metal powder to obtain a metal matrix; the metal powder consists of copper powder, tin powder, cobalt powder and chromium powder; according to the mass percentage, the metal powder comprises 20-30% of tin powder, 10-30% of cobalt powder, 1-5% of chromium powder and the balance of copper powder;
(2) and mixing the metal matrix with the diamond to obtain the grinding wheel material for processing the photovoltaic glass.
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| CN112792753A (en) * | 2021-01-20 | 2021-05-14 | 海安玻克超硬材料有限公司 | Photovoltaic grinding wheel machining process |
| CN114378729B (en) * | 2021-12-26 | 2023-10-03 | 赛尔科技(如东)有限公司 | Chamfering grinding wheel for touch screen glass processing and preparation method thereof |
| CN114472889B (en) * | 2021-12-28 | 2024-02-20 | 苏州赛尔科技有限公司 | Ultra-thin superfinishing cutter with metal binding agent and preparation method |
| CN114378730A (en) * | 2021-12-31 | 2022-04-22 | 赛尔科技(如东)有限公司 | Grinding wheel for roughing and thinning mobile phone back plate glass and preparation method thereof |
| CN115415944A (en) * | 2022-09-14 | 2022-12-02 | 赛尔科技(如东)有限公司 | Silicon carbide wafer thinning grinding wheel, preparation method and processing equipment comprising silicon carbide wafer thinning grinding wheel |
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| CN202240959U (en) * | 2011-08-18 | 2012-05-30 | 江苏神龙光电科技有限公司 | Novel special grinding wheel for photovoltaic glass |
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| US3372010A (en) * | 1965-06-23 | 1968-03-05 | Wall Colmonoy Corp | Diamond abrasive matrix |
| US5976205A (en) * | 1996-12-02 | 1999-11-02 | Norton Company | Abrasive tool |
| WO2010075091A2 (en) * | 2008-12-15 | 2010-07-01 | Saint-Gobain Abrasives, Inc. | Bonded abrasive article and method of use |
| CN102275139A (en) * | 2011-08-18 | 2011-12-14 | 江苏神龙光电科技有限公司 | Special grinding wheel for photovoltaic glass and processing method thereof |
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