CN112643559B - Composite resin binder superhard grinding wheel and preparation method thereof - Google Patents
Composite resin binder superhard grinding wheel and preparation method thereof Download PDFInfo
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- CN112643559B CN112643559B CN202011557365.6A CN202011557365A CN112643559B CN 112643559 B CN112643559 B CN 112643559B CN 202011557365 A CN202011557365 A CN 202011557365A CN 112643559 B CN112643559 B CN 112643559B
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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
- B24D3/20—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 organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
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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
- B24D3/344—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 the bonding agent being organic
Abstract
The invention belongs to the technical field of superhard material products, and particularly relates to a composite resin binder superhard grinding wheel and a preparation method thereof. The composite resin bond superhard grinding wheel comprises the following raw materials in percentage by weight: 10-30% of resin powder, 25-40% of resin liquid, 10-15% of diamond, 10-20% of cubic boron nitride, 8-15% of white corundum, 3-5% of talcum powder, 1-3% of carbon black and the balance of sodium nitrate. The composite resin bond superhard grinding wheel provided by the invention replaces a common abrasive grinding wheel, the number of the metal middle frames is increased by a single grinding wheel, the dressing frequency is reduced, and the yield of products is improved.
Description
Technical Field
The invention belongs to the technical field of superhard material products, and particularly relates to a composite resin binder superhard grinding wheel and a preparation method thereof.
Background
The mobile intelligent terminal represented by the smart phone is the most widely popularized digital product in modern society, and has become the most indispensable article in daily life of people. With the coming of the 5G era, affected by the electromagnetic shielding property of metal, non-metal materials such as ceramic and glass are widely applied to 5G smart phones, and the industry is developed from a metal middle frame and a metal shell to a metal middle frame and a non-metal shell. In the face-watching era of the whole people, people are more favored by narrow frames and high screens; 3D glass, ceramic cover plates and other heavy materials are widely applied; therefore, the strength of the middle frame which is used as a frame of the mobile phone and supports the whole mobile phone is required to be higher and higher. The aluminum alloy used as the main corner of the middle frame material of the mobile phone has the disadvantages of low strength, abrasion resistance, insufficient scratch resistance and the like, and high-strength metals such as stainless steel, steel-aluminum composite materials, titanium alloy and the like are accepted by the industry.
The general processing procedure of the mobile phone middle frame is as follows: blank → forging → CNC processing, grooving → embedding antenna assembly, injection molding sealing → CNC processing → rolling grinding (make the frame more round) → PVD coating (more wear-resisting) → wiredrawing (more aesthetic) → laser carving (make the antenna signal more sensitive) → finished product. The process takes 36 hours after 110 processes. The rolling grinding process of the middle frame generally comprises the steps of fine grinding, rough polishing, high-brightness polishing and the like, wherein the fine grinding is usually carried out by grinding through a common grinding wheel, tool lines machined by CNC are removed, and then the product achieves the mirror surface effect through polishing treatment. In the process of fine grinding of the middle frame by a common grinding wheel, due to the limitation of self performance, the grinding efficiency is low due to low hardness of grinding materials, the grinding materials are easy to fall off, the wear resistance is poor, the service life is short, the shape retentivity is insufficient, the problems that the grinding wheel needs to be frequently dressed, deep scratches on the surface of the middle frame are difficult to remove, the product yield is low and the like are caused. When the stainless steel middle frame with higher strength is finely ground, even the workpiece is not ground and burnt, so that the qualified finished product is difficult to process.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a composite resin bond superhard grinding wheel. The superhard grinding wheel improves the surface quality of a grinding workpiece and the yield of the workpiece, and reduces quality defects such as surface scratches.
The invention also provides a preparation method of the composite resin binder superhard grinding wheel.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a composite resin bond superhard grinding wheel comprises the following raw materials in percentage by weight: 10-30% of resin powder, 25-40% of resin liquid, 10-15% of diamond, 10-20% of cubic boron nitride, 8-15% of white corundum, 3-5% of talcum powder, 1-3% of carbon black and the balance of sodium nitrate (specifically 3-5%).
Preferably, the resin powder is modified phenolic resin powder, the content of the curing agent is 5-8%, the flow length is 25-40, and the particle size of the phenolic resin powder is 6-10 mu m.
Preferably, the resin liquid is a two-component resin liquid and consists of a prepolymer and a curing agent, and the mass ratio of the prepolymer to the curing agent is 1 (0.8-2).
Preferably, the diamond is polycrystalline diamond, and the grain size is 8-16 mu m; the cubic boron nitride is high-purity micro-crushed cubic boron nitride with the particle size of 8-12 mu m; the grain size of the white corundum is 6-8 mu m; the particle size of the talcum powder is more than 150 #; the carbon black is rubber reinforcing carbon black, and the particle size is 8-10 mu m.
The preparation method of the composite resin bond superhard grinding wheel comprises the following steps:
(1) weighing carbon black and 30-60% of resin powder, uniformly stirring, adding the carbon black and the resin powder into the prepolymer of the resin liquid, and uniformly mixing to obtain the I-stage bonding agent;
(2) weighing and uniformly mixing talcum powder and sodium nitrate, adding the talcum powder and the sodium nitrate into the rest resin powder, and uniformly mixing to obtain a II-stage bonding agent;
(3) uniformly mixing diamond, cubic boron nitride and white corundum, adding the mixture into the I-stage bonding agent obtained in the step (1), and uniformly mixing to obtain a I-stage molding material;
(4) adding a curing agent of the resin liquid into the molding material in the stage I in the step (3), uniformly mixing, and carrying out a curing reaction of the prepolymer and the curing agent to obtain a block-shaped object;
(5) crushing the blocky powder in the step (4), and sieving to obtain a forming material in the stage II;
(6) sieving and uniformly mixing the stage II binding agent in the step (2) and the stage II molding material in the step (5) to obtain a molding material, and finishing mixing;
(7) and (4) placing the molding material obtained in the step (6) into a mold for molding to obtain a grinding wheel blank, and turning, milling and grinding the grinding wheel blank to obtain a finished grinding wheel.
Preferably, after the carbon black and the resin powder in the step (1) are uniformly stirred, the carbon black and the resin powder are added into a prepolymer of the resin liquid, and ultrasonic dispersion is carried out for 40min, so as to obtain the I-stage bonding agent.
Preferably, the step (4) is cured at room temperature, and the curing reaction time is 6-10 min.
Preferably, step (5) is carried out by a 40# sieve.
Preferably, in the step (7), the forming temperature is 160 ℃, the pressure is 200 and 500 kN, and the heat preservation and pressure maintaining are carried out for 40 min.
The composite resin bond superhard grinding wheel is used for fine grinding processing of the metal middle frame of the mobile phone.
The resin powder in the formula of the invention provides a brittle tissue bracket of the grinding wheel; the resin liquid forms an elastic grinding domain of the grinding wheel through a curing reaction; diamond and cubic boron nitride are used as super-hard abrasive materials, and the super-hard abrasive materials endow the grinding wheel with excellent material removal capacity; talcum powder, carbon black, sodium nitrate and the like are auxiliary fillers, so that air holes and a lubricating effect are provided for the grinding wheel, and the polishing performance of the grinding wheel is further improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the microstructure of the composite resin bond superhard grinding wheel provided by the invention has an elastic region and a brittle region, and the elastic region and the brittle region are mutually crossed and contain structural characteristics; the elastic area has flexible grinding capacity, and the brittle area as a support has certain strength and rigidity and can keep continuous self-sharpening, so that the blockage of grinding chips on the grinding wheel is reduced, and the dressing frequency of the grinding wheel is reduced;
2. the grinding area of the composite resin bond superhard grinding wheel provided by the invention has good elasticity, and is beneficial to the consistency of the exposed edge height of abrasive particles in the grinding process, so that the quality of the grinding surface is improved, the quality defects such as surface scratches and the like are reduced, and the yield of workpieces is improved;
3. the grinding area of the composite resin bond superhard grinding wheel provided by the invention has good elasticity, and in the grinding process, compared with a common grinding wheel and a common resin grinding wheel, the impact force applied to the grinding material is softer, so that the crushing and abrasion of the grinding material can be reduced, the number of grinding workpieces of the grinding wheel in the service life is increased, and the service life of the grinding wheel is prolonged;
4. the invention adopts a liquid-powder mixing process to prepare the grinding wheel, can well disperse brittle resin into an elastic region, and realizes a structure that the elastic region and the brittle region are crossed and contained.
Drawings
Fig. 1 is a microstructure view of a cross-sectional surface of a grinding wheel layer of a composite resin bond super-hard grinding wheel manufactured in example 1;
FIG. 2 is a surface microstructure of a workpiece ground using the wheel of example 1;
FIG. 3 is a surface micro-topography of a workpiece ground with a commercially available conventional abrasive grinding wheel;
FIG. 4 is a surface microstructure of a workpiece ground using the grinding wheel of comparative example 1;
FIG. 5 is a surface microstructure of a workpiece ground using the wheel of comparative example 2.
Detailed Description
The invention is further illustrated, but not limited, by the following examples and the accompanying drawings.
The following examples used the following raw materials with the following manufacturers and models: resin powder-6530A modified phenolic resin powder of Guangzhou Wei Rina chemical Co., Ltd, resin liquid-polyurethane elastomer YC-9010 of Yucheng resin technology Co., Ltd, Dongguan city (A component is prepolymer and B component is curing agent), diamond-LMF/LMF + of Henan labor-saving diamond shares Co., Ltd, cubic boron nitride-CBNM-B of Zhenzhou Nanjie superhard materials Co., Ltd, white corundum micropowder (W5) of white corundum-white pigeon Co., Ltd, talcum powder-Hubei Han Jie industry promotion chemical Co., Wubi-Suzhou Ka fine chemical Co., Ltd (model N220), and sodium nitrate-Changsha Wei Chu creation chemical Co., Ltd.
Example 1
A composite resin bond superhard grinding wheel is composed of the following raw materials in percentage by weight: 10% of modified phenolic resin powder (6530A), 40% of polyurethane elastomer (YC-9010, A: B =1: 1), 10% of diamond (LMF/LMF +, particle size M8/16), 15% of cubic boron nitride (CBNM-B, particle size M8/12), 12% of white corundum (particle size W5), 5% of talcum powder, 3% of carbon black (N220) and 5% of sodium nitrate.
The preparation method of the composite resin binder superhard grinding wheel comprises the following steps:
(1) weighing carbon black and 50% of modified phenolic resin powder (half of the amount of the modified phenolic resin powder in the formula) in the formula, uniformly mixing, adding the mixture into the component A of the polyurethane elastomer, stirring, mixing and ultrasonically dispersing for 40min to obtain the stage I bonding agent;
(2) weighing talcum powder and sodium nitrate, uniformly mixing, adding into the rest modified phenolic resin powder, sieving, and uniformly mixing to obtain a stage II binding agent;
(3) uniformly mixing diamond, cubic boron nitride and white corundum, adding the mixture into the I-stage bonding agent obtained in the step (1), and uniformly mixing the mixture in a high-speed mixer to obtain a I-stage molding material;
(4) adding the component B in the polyurethane elastomer into the molding material in the stage I in the step (3), quickly and uniformly mixing, and curing at room temperature for 6min to obtain a block-shaped object;
(5) crushing the block-shaped material in the step (4) in an airflow mill, screening the crushed material through a No. 40 screen, and taking undersize materials to obtain a forming material in the stage II;
(6) sieving the stage II binding agent in the step (2) and the stage II molding material in the step (5), and uniformly mixing to obtain a molding material to finish mixing;
the grinding wheel forming and processing technology comprises the following steps:
(7) assembling a mould, uniformly spraying a release agent in a mould cavity, and after the release agent in the mould cavity is dried, putting a molding material into the mould cavity and leveling;
(8) covering a die pressure head, placing the die pressure head in a hot oil press at 160 ℃ under the pressure of 350 kN, pressing to a designed size according to a program, keeping the temperature and the pressure for 40min, unloading the die after finishing the keeping the temperature and the pressure to obtain a grinding wheel blank, and turning, milling and grinding the grinding wheel blank to obtain a finished grinding wheel.
Fig. 1 is a microstructure view of a cross-section of a grinding wheel layer of a composite resin bond super-hard grinding wheel prepared in example 1, in which a is an elastic region having a significant deformation at fracture; b is a brittle region, and the fracture surface is smooth. As can be seen from fig. 1, the regions a and b intersect with each other and surround each other, i.e. the microstructure of the prepared resinoid bond superhard grinding wheel has an elastic region and a brittle region, and the elastic region and the brittle region intersect with each other and contain structural features.
Example 2
A composite resin bond superhard grinding wheel is composed of the following raw materials in percentage by weight: 30% of modified phenolic resin powder (6530A), 25% of polyurethane elastomer (YC-9010, A: B =1: 0.8), 15% of diamond (LMF/LMF +, particle size M8/16), 10% of cubic boron nitride (CBNM-B, particle size M8/12), 12% of white corundum (particle size W5), 4% of talcum powder, 1% of carbon black (N220) and 3% of sodium nitrate.
The preparation method of the composite resin binder superhard grinding wheel comprises the following steps:
(1) weighing carbon black and 30% of modified phenolic resin powder in the formula, uniformly mixing, adding into the component A of the polyurethane elastomer, stirring, mixing and ultrasonically dispersing for 30min to obtain a bonding agent in the stage I;
(2) weighing talcum powder and sodium nitrate, uniformly mixing, adding into the rest modified phenolic resin powder, sieving, and uniformly mixing to obtain a stage II binding agent;
(3) uniformly mixing diamond, cubic boron nitride and white corundum, adding the mixture into the I-stage bonding agent obtained in the step (1), and uniformly mixing the mixture in a high-speed mixer to obtain a I-stage molding material;
(4) adding the component B in the polyurethane elastomer into the molding material in the stage I in the step (3), quickly and uniformly mixing, and curing at room temperature for 10min to obtain a block-shaped object;
(5) crushing the block-shaped material in the step (4) in an airflow mill, screening the crushed material through a No. 40 screen, and taking undersize materials to obtain a forming material in the stage II;
(6) sieving the stage II binding agent in the step (2) and the stage II molding material in the step (5), and uniformly mixing to obtain a molding material to finish mixing;
the grinding wheel forming and processing technology comprises the following steps:
(7) assembling a mould, uniformly spraying a release agent in a mould cavity, and after the release agent in the mould cavity is dried, putting a molding material into the mould cavity and leveling;
(8) covering a die pressure head, placing the die pressure head in a hot oil press at 140 ℃ under the pressure of 200 kN, pressing to a designed size according to a program, keeping the temperature and pressure for 30min, unloading the die after the heat and pressure preservation is finished to obtain a grinding wheel blank, and turning, milling and grinding the grinding wheel blank to obtain a finished grinding wheel.
Example 3
A composite resin bond superhard grinding wheel is composed of the following raw materials in percentage by weight: 20% of modified phenolic resin powder (6530A), 26% of polyurethane elastomer (YC-9010, A: B =1: 2), 10% of diamond (LMF/LMF +, particle size M8/16), 20% of cubic boron nitride (CBNM-B, particle size M8/12), 15% of white corundum (particle size W5), 3% of talcum powder, 2% of carbon black (N220) and 4% of sodium nitrate.
The preparation method of the composite resin binder superhard grinding wheel comprises the following steps:
(1) weighing carbon black and 60% of modified phenolic resin powder in the formula, uniformly mixing, adding into the component A of the polyurethane elastomer, stirring, mixing and ultrasonically dispersing for 50min to obtain a bonding agent in the stage I;
(2) weighing talcum powder and sodium nitrate, uniformly mixing, adding into the rest modified phenolic resin powder, sieving, and uniformly mixing to obtain a stage II binding agent;
(3) uniformly mixing diamond, cubic boron nitride and white corundum, adding the mixture into the I-stage bonding agent obtained in the step (1), and uniformly mixing the mixture in a high-speed mixer to obtain a I-stage molding material;
(4) adding the component B in the polyurethane elastomer into the molding material in the stage I in the step (3), quickly and uniformly mixing, and curing at room temperature for 8min to obtain a block-shaped object;
(5) crushing the block-shaped material in the step (4) in an airflow mill, screening the crushed material through a No. 40 screen, and taking undersize materials to obtain a forming material in the stage II;
(6) sieving the stage II binding agent in the step (2) and the stage II molding material in the step (5), and uniformly mixing to obtain a molding material to finish mixing;
the grinding wheel forming and processing technology comprises the following steps:
(7) assembling a mould, uniformly spraying a release agent in a mould cavity, and after the release agent in the mould cavity is dried, putting a molding material into the mould cavity and leveling;
(8) covering a die pressure head, placing the die pressure head in a hot oil press at 180 ℃ under the pressure of 500 kN, pressing to a designed size according to a program, keeping the temperature and pressure for 50min, unloading the die after the heat and pressure preservation is finished to obtain a grinding wheel blank, and turning, milling and grinding the grinding wheel blank to obtain a finished grinding wheel.
Comparative example 1
The formulation of this comparative example differs from that of example 1 in that: the formulation of this comparative example did not have a polyurethane elastomer.
The preparation method of the grinding wheel of the comparative example comprises the following steps: all the ingredients in the formula are added together and mixed uniformly to obtain a molding material, and the grinding wheel molding processing technology refers to example 1.
Comparative example 2
The formulation of this comparative example differs from that of example 1 in that: the formulation of this comparative example did not have modified phenolic resin powder.
The preparation method of the grinding wheel of the comparative example comprises the following steps: uniformly mixing carbon black, the component A of the polyurethane elastomer, talcum powder, sodium nitrate, diamond, cubic boron nitride and white corundum in the formula, and then curing the mixture and the component B of the polyurethane elastomer for 6min at room temperature to obtain a block; the rest of the procedure was the same as in example 1.
The composite bond superhard grinding wheel prepared in the embodiment 1 is used for carrying out grinding test tests (grinding is carried out on a five-shaft high-speed machining center, the grinding parameters are 2200rpm/min of rotating speed, 550mm/min of feeding speed and 0.003-0.005mm of fine grinding cut depth) on 316 stainless steel (the material of a mobile phone middle frame) together with a commercially available common abrasive grinding wheel (a LEWIS grinding wheel of Shenzhen Lewis machinery Co., Ltd.) and grinding wheels prepared in the comparative examples 1 and 2, the grinding smoothness and the dressing frequency are compared, the abrasion ratio is measured, the service life of the grinding wheel is estimated according to the abrasion ratio, and the results are shown in a table 1:
TABLE 1 comparison of several grinding wheel Properties
As can be seen from the data in table 1, the composite resin binder superhard grinding wheel prepared in example 1 has excellent performance, and has the characteristics and advantages of low grinding wheel dressing frequency and long grinding wheel service life compared with the common abrasive grinding wheel sold in the industry. The grinding wheel only adopting resin as a binding agent (comparative example 1) can achieve higher grinding service life; the grinding wheel only adopting rubber as a bonding agent (comparative example 2) can achieve better smoothness; however, both of them only focus on the performance of a certain aspect, and cannot meet the requirements of grinding quality, dressing frequency and service life at the same time.
Fig. 2-5 are surface micro-topography maps of a workpiece ground using the wheel of example 1, a commercially available conventional abrasive wheel, and the wheels of comparative example 1 and comparative example 2, respectively. 2-5, the grinding wheel of the embodiment 1 is adopted to grind the workpiece, the surface of the workpiece has more excellent grinding quality, the grinding lines are shallow, and the finish is good; and the rest grinding wheels are adopted to grind the workpiece, and the surface of the workpiece has deep scratches.
Claims (10)
1. The preparation method of the composite resin bond superhard grinding wheel is characterized in that the composite resin bond superhard grinding wheel comprises the following raw materials in percentage by weight: 10-30% of resin powder, 25-40% of resin liquid, 10-15% of diamond, 10-20% of cubic boron nitride, 8-15% of white corundum, 3-5% of talcum powder, 1-3% of carbon black and the balance of sodium nitrate, and the preparation method comprises the following steps:
(1) weighing carbon black and 30-60% of resin powder, uniformly stirring, adding the mixture into the prepolymer of the resin liquid, and uniformly mixing to obtain the I-stage bonding agent;
(2) weighing and uniformly mixing talcum powder and sodium nitrate, then adding the talcum powder and the sodium nitrate into the rest resin powder, and uniformly mixing to obtain the II-stage bonding agent;
(3) uniformly mixing diamond, cubic boron nitride and white corundum, adding the mixture into the I-stage bonding agent obtained in the step (1), and uniformly mixing to obtain a I-stage molding material;
(4) adding a curing agent of the resin liquid into the molding material in the stage I in the step (3), uniformly mixing, and carrying out a curing reaction of the prepolymer and the curing agent to obtain a block-shaped object;
(5) crushing the blocky powder in the step (4), and sieving to obtain a forming material in the stage II;
(6) sieving and uniformly mixing the stage II binding agent in the step (2) and the stage II molding material in the step (5) to obtain a molding material, and finishing mixing;
(7) and (4) placing the molding material obtained in the step (6) into a mold for molding to obtain a grinding wheel blank, and turning, milling and grinding the grinding wheel blank to obtain a finished grinding wheel.
2. The method for preparing the composite resin bond superhard grinding wheel according to claim 1, wherein the resin powder is modified phenolic resin powder.
3. The method for preparing the composite resin binder superhard grinding wheel according to claim 1, wherein the resin liquid is a two-component resin liquid and consists of a prepolymer and a curing agent, and the mass ratio of the prepolymer to the curing agent is 1 (0.8-2).
4. The method for preparing the composite resin bond superhard grinding wheel according to claim 1, wherein the diamond is polycrystalline diamond and has a particle size of 8-16 μm, the particle size of cubic boron nitride is 8-12 μm, the particle size of white corundum is 6-8 μm, the particle size of talcum powder is larger than 150#, and the particle size of carbon black is 8-10 μm.
5. The method for preparing the composite resin bond superhard grinding wheel according to claim 1, wherein the carbon black and the resin powder in the step (1) are added into the prepolymer of the resin liquid after being uniformly stirred, and the mixture is ultrasonically dispersed for 30-50min to obtain the stage I bonding agent.
6. The method for preparing the composite resinoid bond superhard grinding wheel according to claim 1, wherein the curing reaction time in the step (4) is 6-10 min.
7. The method for preparing the composite resinoid bond superhard grinding wheel according to claim 1, wherein a 40# sieve is used in the step (5).
8. The method for preparing the composite resin bond superhard grinding wheel as claimed in claim 1, wherein the molding temperature in the step (7) is 140-.
9. The application of the composite resin bond superhard grinding wheel is characterized in that the composite resin bond superhard grinding wheel prepared by the method of claim 1 is used for fine grinding processing of a metal middle frame of a mobile phone, and the composite resin bond superhard grinding wheel comprises the following raw materials in percentage by weight: 10-30% of resin powder, 25-40% of resin liquid, 10-15% of diamond, 10-20% of cubic boron nitride, 8-15% of white corundum, 3-5% of talcum powder, 1-3% of carbon black and the balance of sodium nitrate.
10. The use according to claim 9, wherein the resin powder is a modified phenolic resin powder; the resin liquid is a two-component resin liquid and consists of a prepolymer and a curing agent, and the mass ratio of the prepolymer to the curing agent is 1 (0.8-2); the diamond is polycrystalline diamond, the particle size is 8-16 mu m, the particle size of cubic boron nitride is 8-12 mu m, the particle size of white corundum is 6-8 mu m, the particle size of talcum powder is larger than 150#, and the particle size of carbon black is 8-10 mu m.
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| CN103056788B (en) * | 2012-12-26 | 2016-01-27 | 厦门宇信金刚石工具有限公司 | A kind of preparation method of sharp epoxy resin binder diamond grinding tool |
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