White corundum iridium-plated abrasive cutting grinding wheel and preparation method thereof

Abstract

The invention discloses a white corundum iridium-plated abrasive cutting grinding wheel and a preparation method thereof, and the white corundum iridium-plated abrasive cutting grinding wheel is prepared from the following components in percentage by mass: 52.4%-56.7% of white corundum iridium-plated abrasive, 10.5%-14.9% of glass fiber mesh cloth, 16.5%-20.2% of a binding agent, 11.8%-16% of filler and 0.3%-0.7% of a coloring agent. The binding agent is phenolic resin and comprises liquid phenolic resin and powder phenolic resin, the mass ratio of the liquid phenolic resin to the powder phenolic resin is 1: (2-3), and the filler is calcium sulfate whisker, potassium cryolite, magnesium oxide and iron sulfide. The abrasive cutting wheel is an ultra-thin cutting tool prepared from the white corundum iridium-plated abrasive, the modified phenolic resin, the filler and the like through mixing, high-temperature sintering and curing procedures, and has the advantages of high hardness, high wear resistance, sharp cutting edge and good finish of the machined surface, the performance and wear resistance of the abrasive are improved, and the sharpness and grinding efficiency of the abrasive cutting wheel are improved.

Description

Technical Field

[0001] The invention relates to the field of grinding wheel preparation, and in particular to a white corundum iridium-plated abrasive cutting grinding wheel and a preparation method thereof. Background Art

[0002] Although the conventional thin-slice cutting wheels on the market have excellent cutting capabilities, when cutting hard and brittle materials such as semiconductor substrates, it is very easy for the grinding wheel slices to break or the cutting edge to be not sharp enough to cut. Especially when cutting hard materials with high hardness, it is more likely to cause carbonization and breakage due to the high temperature generated by cutting, which can easily cause poor surface finish of the cut product. In production, the cutting wheels with super-features are more likely to bend, deform, crack or have uneven distribution density of local material components during the blank forming and curing process, which greatly affects the rigidity of the grinding wheel after forming and the sharpness of the cutting edge, and reduces the user's cutting experience and accuracy of the object after cutting. Summary of the invention

[0003] The present invention mainly solves the technical problems existing in the prior art, thereby providing a white corundum-iridium-plated abrasive cutting wheel with high hardness, high wear resistance, sharp cutting edge, good processing surface finish, and improved sharpness and grinding efficiency of the cutting wheel, and a preparation method thereof.

[0004] To solve the above problems, the present invention adopts the following technical scheme, which is composed of the following components by mass: white corundum-iridium-plated abrasive: 52.4%-56.7%, glass fiber mesh: 10.5%-14.9%, binder: 16.5%-20.2%, filler: 11.8%-16%, the white corundum-iridium-plated abrasive adopts an abrasive particle size of 24#-60#, the binder is phenolic resin, including liquid phenolic resin and powdered phenolic resin, and the mass ratio of liquid phenolic resin to powdered phenolic resin is 1:(1.7-2.8), and the filler is one or a combination of calcium sulfate whiskers, potassium cryolite, magnesium oxide, and iron sulfide.

[0005] The fillers are calcium sulfate whiskers and potassium cryolite, and the mass ratio of the calcium sulfate whiskers to the potassium cryolite is 1:(2.8-4.9).

[0006] The invention also includes a colorant, which accounts for 0.3%-0.7% of the total mass percentage. The colorant is one of iron red, titanium white and carbon black.

[0007] The white corundum iridium-plated abrasive adopts 24 # —36 # Abrasive particle size.

[0008] The white corundum iridium-plated abrasive adopts 46 # —54# Abrasive particle size.

[0009] The binder is a modified phenolic resin and accounts for 17.8%-18.5% of the total mass percentage; the liquid phenolic resin is a thermosetting phenolic resin in a liquid state; and the powdered phenolic resin is a thermoplastic phenolic resin in a powdered state.

[0010] The preparation method of the white corundum-iridium-plated abrasive cutting wheel and the preparation method thereof comprises the following steps:

[0011] S1 Raw material configuration

[0012] (a) Weigh the corresponding weight of white corundum-coated iridium abrasive according to the applicable cutting requirements, and filter through the sieve to select 46 # —54 # White corundum-plated iridium abrasive with an abrasive particle size of , and then add liquid phenolic resin of corresponding mass percentage and put it and the white corundum-plated iridium abrasive into No. 1 mixer for stirring at the same time. The stirring time is 15min-30min and the stirring speed is 120rpm-135rpm, so that the white corundum-plated iridium abrasive can be evenly dispersed in the liquid phenolic resin to form a liquid mixture for standby use.

[0013] (b) According to the mass ratio of 1:2 to the liquid phenolic resin, a corresponding weight of powdered phenolic resin is added to the No. 2 mixer, and calcium sulfate whisker and potassium cryolite are added in a mass ratio of 1:3.8 to stir, and then the colorant is added to the mixer for mixing and stirring. The stirring time is 6min-10min, and the stirring speed is 45rpm-55rpm to form a powder additive for standby use. If the powdered material is lumpy, it should be weighed and stirred for 46 # —60 # Purpose sieve hole.

[0014] (c) The powder additive in the second mixer is introduced into the liquid mixture in the first mixer and mixed with each other. The mixture is fully mixed by the mixer for 50-60 minutes at a stirring speed of 80-100 rpm. The mixture is allowed to stand for 20-24 hours after mixing. # —12 # The purpose of the sieve hole to obtain the molding material.

[0015] S2 Billet Forming

[0016] The mixed loose molding material is evenly spread into the pressing mold cavity, and is scraped flat by a scraper. Then, glass fiber mesh and grinding wheel hole ring are added in turn, and the molding is pressed by a hydraulic press. The molding pressure is 10Mpa-13Mpa, so that the molding material flows and quickly fills the entire cavity, and the molding material is gradually solidified into a blank in the mold cavity. Finally, the mold is unloaded and the grinding wheel blank is taken out. The grinding wheel blank thickness is ≤1.2mm, the grinding wheel blank outer diameter is 115mm-125mm, and the grinding wheel blank end face runout is ≤0.6mm.

[0017] S3 blank placement

[0018] Put the pressed grinding wheel blanks on the drying rack, connect them in series through string rods, and stack them with pads and nets. Put a net on each grinding wheel blank, and separate every 5-10 grinding wheel blanks with a flat aluminum pad. Each string rod can hold 50 to 100 grinding wheel blanks and a spring on top. There is a detachable counterweight in the string rod, and the counterweight is located above the spring.

[0019] S4 sintering and curing

[0020] The drying rack with the grinding wheel blank is placed in the tunnel kiln and heated according to the specified curve to harden the blank into a grinding wheel product that meets the standards. It is then transported in the tunnel kiln at a speed of 1m / h. At the same time, the temperature is gradually heated from a low temperature to a high temperature of 180℃-195℃, a curing temperature, at a rate of 10℃ / h, and kept warm for 12h-15h.

[0021] S5 kiln placement

[0022] After the insulation time is up, the tunnel kiln is allowed to cool naturally to room temperature, and the drying rack with the grinding wheel blank is pushed out. The grinding wheel is then taken out of the drying rack, marked for production, and placed in the corresponding specified position.

[0023] The beneficial effects of the present invention are as follows: the cutting grinding wheel has the characteristics of high hardness, high wear resistance, sharp cutting edge and good processing surface finish. The selection of fine-grained white corundum-iridium-plated abrasive improves the holding ability of the binder on the abrasive, thereby increasing the actual contact area between the binder and the abrasive, so that the proportion of fine-grained white corundum-iridium-plated abrasive that can be added to the corresponding content of the binder is greater, so as to ensure the high hardness and high wear resistance of the cutting grinding wheel prepared by the fine-grained white corundum-iridium-plated abrasive; and the binder adopts two phenolic resins in different property states, namely liquid phenolic resin and powdered phenolic resin, which are separately mixed with the abrasive and the filler and then combined and stirred. The single separate mixing and stirring not only ensures the sufficient contact area between the outer surface of the abrasive and the liquid phenolic resin, but also ensures that the powdered phenolic resin is fully mixed and added to the filler, thereby improving the shaping effect of the filler on the abrasive, ensuring the uniformity and sufficiency of the mixing of various materials, and ensuring the molding material. Excellent, avoiding the phenomenon of "powder leakage" of the blank due to dryness caused by a single material binder, or the agglomeration or uneven mixing caused by wet molding materials, ensuring the uniformity of the molding material spreading and the density of subsequent pressing molding. At the same time, the thermosetting property of liquid phenolic resin and the thermoplasticity of powdered phenolic resin are in a mass ratio of 1: (1.7-2.8), which increases the holding force between abrasives, fillers and binders and the molding and fixing effect of the blank, thereby improving the firmness of the cutting wheel; and the use of calcium sulfate whiskers and potassium cryolite mixed with powdered phenolic resin can also effectively improve the physical and chemical stability of the binder in the grinding wheel. The abrasive, filler and binder in the molding material are mixed into large molecular chains, which are staggered and cross-linked in space to increase the strength. Even if a molecular chain suddenly breaks under stress, the external force can be dispersed to the adjacent molecular chains, and the adjacent molecular chains can assist in reinforcement, ensuring the heat resistance and service life of the grinding wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a process diagram of the mixing and preparation of molding materials in the present invention;

[0026] Figure 2 It is a process diagram of the preparation and molding process of the grinding wheel in the present invention. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of this patent.

[0028] Example 1

[0029] A white corundum-iridium-plated abrasive cutting wheel is composed of the following components by mass: white corundum-iridium-plated abrasive: 54%, and the white corundum-iridium-plated abrasive is 46 # —54 # Abrasive particle size; glass fiber mesh: 12.7%; binder: 18.5%, in which liquid phenolic resin and powdered phenolic resin account for 6.2% and 12.3% of the total mass percentage respectively; filler: 13.7%, in which calcium sulfate whisker and potassium cryolite account for 2.8% and 10.9% of the total mass percentage respectively; colorant: 0.5%; weighing error of ±0.5%.

[0030] like Figure 1 and Figure 2 The method for preparing the white corundum-coated iridium abrasive cutting wheel shown comprises the following steps:

[0031] S1 Raw material configuration

[0032] (a) According to the cutting requirements, weigh 54% of the total mass of white corundum-coated iridium abrasive and filter it through a sieve. # —54 # White corundum-plated iridium abrasive with an abrasive particle size of , and then add liquid phenolic resin accounting for 6.2% of the total mass. Put it and the white corundum-plated iridium abrasive into the No. 1 mixer at the same time and stir at a stirring speed of 130rpm-135rpm for 20min to allow the white corundum-plated iridium abrasive to be evenly dispersed in the liquid phenolic resin to form a liquid mixture for standby use.

[0033] (b) Add 12.3% of the total weight of phenolic resin powder to the No. 2 mixer, and add 2.8% of the total weight of calcium sulfate whiskers and 10.9% of potassium cryolite to the mixer, and then add 0.5% of the colorant to the mixer and stir at a stirring speed of 50-55 rpm for 7 minutes to form a powder additive for standby use. If the powdered phenolic resin, calcium sulfate whiskers, potassium cryolite or colorant powder materials are agglomerated, pass them through 46 # —60 # Purpose sieve hole.

[0034] (c) The powdered additives mixed in the No. 2 mixer are introduced into the liquid mixture in the No. 1 mixer and stirred at a stirring speed of 90 rpm to 95 rpm for 55 minutes. After the mixture is completely stirred, it is allowed to stand for 22 hours to 24 hours and then rinsed once for 8 hours. # —12 # The purpose of the sieve hole to obtain the molding material.

[0035] S2 Billet Forming

[0036] The mixed loose molding material is evenly spread into the pressing mold cavity, and is scraped flat by a scraper. Then, glass fiber mesh cloth and grinding wheel hole ring are added in turn, and the molding material is pressed by a hydraulic press at a molding pressure of 12Mpa-13Mpa to make the molding material flow and quickly fill the entire cavity. The molding material is gradually solidified into a blank in the mold cavity, and then the grinding wheel blank is removed from the mold. The thickness of the grinding wheel blank is ≤1.2mm, the outer diameter of the grinding wheel blank is 115mm-125mm, and the end face circular runout of the grinding wheel blank is ≤0.6mm.

[0037] S3 blank placement

[0038] Put the pressed grinding wheel blanks on the drying rack, connect them in series through string rods, and stack them with pads and nets. Put a net on each grinding wheel blank, and separate every 5-10 grinding wheel blanks with a flat aluminum pad. Each string rod can hold 50 to 100 grinding wheel blanks and a spring on top. There is a detachable counterweight in the string rod, and the counterweight is located above the spring.

[0039] S4 sintering and curing

[0040] The drying rack with the grinding wheel blank is placed in the tunnel kiln and heated according to the specified curve to harden the blank into a grinding wheel product that meets the standards. It is then transported in the tunnel kiln at a speed of 1m / h. At the same time, the temperature is gradually heated from a low temperature to a high temperature of 190°C, a curing temperature, at a rate of 10°C / h, and kept warm for 12h-13h.

[0041] S5 kiln placement

[0042] After the insulation time is up, the tunnel kiln is allowed to cool naturally to room temperature, and the drying rack with the grinding wheel blank is pushed out. The grinding wheel is then taken out of the drying rack, marked for production, and placed in the corresponding specified position.

[0043] Through this formula and preparation method, it is determined that the concentration, hardness and particle size levels of this formula are the highest, and the abrasive particle size used is appropriate, which ensures the high strength, high rigidity, low grinding heat, and appropriate surface finish of the grinding wheel after preparation. It effectively ensures that the abrasive, filler, and binder in the molding material are mixed into macromolecular chains and are staggered and cross-linked in space, thereby increasing the strength of use, facilitating the step-by-step mixing of the liquid phenolic resin and the powdered phenolic resin in the binder, and ensuring and improving the binder's ability to hold the abrasive.

[0044] Main technical indicators

[0045] ① Grinding wheel thickness: ≤1mm;

[0046] ② Grinding wheel outer diameter: 115mm, end face circular runout: ≤0.5mm;

[0047] ③ Rotational strength: When the speed gradually increases to 23000r / min and is maintained for 30s, the grinding wheel does not break;

[0048] ④ Grinding efficiency: ≥0.27g / s.

[0049] Example 2

[0050] A white corundum-iridium-coated abrasive cutting wheel is composed of the following components by mass: white corundum-iridium-coated abrasive: 53%, and the white corundum-iridium-coated abrasive is 24 # —36 # Abrasive particle size; glass fiber mesh: 11.3%; binder: 20%, in which liquid phenolic resin and powdered phenolic resin account for 7.4% and 12.6% of the total mass percentage respectively; filler: 15.3%, in which calcium sulfate whisker and potassium cryolite account for 3.9% and 11.4% of the total mass percentage respectively; colorant: 0.4%; weighing error of ±0.5%.

[0051] The preparation method of the white corundum-iridium-plated abrasive cutting wheel comprises the following steps:

[0052] S1 Raw material configuration

[0053] (a) According to the cutting requirements, weigh 53% of the total mass of white corundum-coated iridium abrasive and filter it through a sieve. # —36 # White corundum-plated iridium abrasive with an abrasive particle size of , and then add liquid phenolic resin accounting for 7.4% of the total mass. Put it and the white corundum-plated iridium abrasive into the No. 1 mixer at the same time and stir at a stirring speed of 120rpm-125rpm for 15min to allow the white corundum-plated iridium abrasive to be evenly dispersed in the liquid phenolic resin to form a liquid mixture for standby use.

[0054] (b) Add 12.6% of the total weight of phenolic resin powder to the No. 2 mixer, and add 3.9% of the total weight of calcium sulfate whiskers and 11.4% of potassium cryolite to the mixer, and then add 0.4% of the colorant to the mixer and stir at a stirring speed of 45 rpm to 50 rpm for 6 minutes to form a powder additive for standby use. If the powdered phenolic resin, calcium sulfate whiskers, potassium cryolite or colorant powder materials are agglomerated, pass them through 46 # —60 # Purpose sieve hole.

[0055] (c) The powdered additives mixed in the No. 2 mixer are introduced into the liquid mixture in the No. 1 mixer and stirred at a stirring speed of 80-85 rpm for 55 min. After the mixture is completely stirred, it is allowed to stand for 22-24 hours and then rinsed for 8 hours. # —12 # The purpose of the sieve hole to obtain the molding material.

[0056] S2 Billet Forming

[0057] The mixed loose molding material is evenly spread into the pressing mold cavity, and is scraped flat by a scraper. Then, glass fiber mesh cloth and grinding wheel hole ring are added in turn, and the molding material is pressed by a hydraulic press at a molding pressure of 10Mpa-11Mpa to make the molding material flow and quickly fill the entire cavity. The molding material is gradually solidified into a blank in the mold cavity, and then the grinding wheel blank is removed from the mold. The thickness of the grinding wheel blank is ≤1.2mm, the outer diameter of the grinding wheel blank is 115mm-125mm, and the end face circular runout of the grinding wheel blank is ≤0.6mm.

[0058] S3 blank placement

[0059] Put the pressed grinding wheel blanks on the drying rack, connect them in series through string rods, and stack them with pads and nets. Put a net on each grinding wheel blank, and separate every 5-10 grinding wheel blanks with a flat aluminum pad. Each string rod can hold 50 to 100 grinding wheel blanks and a spring on top. There is a detachable counterweight in the string rod, and the counterweight is located above the spring.

[0060] S4 sintering and curing

[0061] The drying rack with the grinding wheel blank is placed in the tunnel kiln and heated according to the specified curve to harden the blank into a grinding wheel product that meets the standards. It is then transported in the tunnel kiln at a speed of 1m / h. At the same time, the temperature is gradually heated from a low temperature to a high temperature of 180°C, which is a curing temperature, at a rate of 10°C / h and kept warm for 12h-13h.

[0062] S5 kiln placement

[0063] After the insulation time is up, the tunnel kiln is allowed to cool naturally to room temperature, and the drying rack with the grinding wheel blank is pushed out. The grinding wheel is then taken out of the drying rack, marked for production, and placed in the corresponding specified position.

[0064] Compared with Example 1, this embodiment uses white corundum-plated iridium abrasives with different abrasive particle sizes. The processing steps of the production process are the same, and the stirring speed, stirring time, and processing temperature are correspondingly different, so that the cutting accuracy of the grinding wheel in Example 1 after preparation is relatively high, and the cutting rate of Example 2 is relatively fast. Compared with ordinary cutting grinding wheels, it has the same advantages of high hardness, high wear resistance, sharp cutting edge, and good processing surface finish.

[0065] Example 3

[0066] A white corundum-iridium-plated abrasive cutting wheel is composed of the following components by mass: white corundum-iridium-plated abrasive: 56%, and the white corundum-iridium-plated abrasive is 60 # Abrasive particle size; glass fiber mesh: 10.8%; binder: 16.8%, in which liquid phenolic resin and powdered phenolic resin account for 4.8% and 12% of the total mass respectively; filler: 15.8%, and the fillers are potassium cryolite, calcium sulfate whisker, magnesium oxide, and iron sulfide, accounting for 7.2%, 1.8%, 3.8% and 3% of the total mass respectively; colorant: 0.6%; weighing error of ±0.5%.

[0067] The preparation method of the white corundum-iridium-plated abrasive cutting wheel comprises the following steps:

[0068] S1 Raw material configuration

[0069] (a) According to the cutting requirements, weigh 56% of the total mass of white corundum-coated iridium abrasive and filter 60% through a sieve. # White corundum-plated iridium abrasive with an abrasive particle size of , and then add liquid phenolic resin accounting for 4.8% of the total mass. Put it and the white corundum-plated iridium abrasive into the No. 1 mixer at the same time and stir at a stirring speed of 130 rpm for 25 minutes to allow the white corundum-plated iridium abrasive to be evenly dispersed in the liquid phenolic resin to form a liquid mixture for standby use.

[0070] (b) Add 12% of the total weight of phenolic resin powder to the No. 2 mixer, and add 7.2% of potassium cryolite, 1.8% of calcium sulfate whisker, 3.8% of magnesium oxide, and 3% of iron sulfide in turn for stirring. Then add 0.6% of the colorant to the mixer and stir at a stirring speed of 50 rpm for 10 minutes to form a powder additive for standby use. If the powdered materials of phenolic resin, cryolite, magnesium oxide, iron sulfide or colorant are agglomerated, pass them through 46 # —60 # Purpose sieve hole.

[0071] (c) The powdered additives mixed in the No. 2 mixer were introduced into the liquid mixture in the No. 1 mixer and stirred at a stirring speed of 95 rpm for 50 min. After the mixture was completely stirred, it was allowed to stand for 20 hours and then rinsed once for 8 hours. # —12 # The purpose of the sieve hole to obtain the molding material.

[0072] S2 Billet Forming

[0073] The mixed loose molding material is evenly spread into the pressing mold cavity and scraped flat with a scraper. Then, glass fiber mesh and grinding wheel hole ring are added in turn. The mold is pressed with a hydraulic press at a molding pressure of 10Mpa to make the molding material flow and quickly fill the entire cavity. The molding material is gradually solidified into a green body in the mold cavity, and then the grinding wheel green body is removed from the mold.

[0074] S3 blank placement

[0075] Put the pressed grinding wheel blanks on the drying rack, connect them in series through string rods, and stack them with pads and nets. Put a net on each grinding wheel blank, and separate every 5-10 grinding wheel blanks with a flat aluminum pad. Each string rod can hold 50 to 100 grinding wheel blanks and a spring on top. There is a detachable counterweight in the string rod, and the counterweight is located above the spring.

[0076] S4 sintering and curing

[0077] The drying rack with the grinding wheel blank is placed in the tunnel kiln and heated according to the specified curve to harden the blank into a grinding wheel product that meets the standards. It is then transported in the tunnel kiln at a speed of 1m / h. At the same time, the temperature is gradually heated from a low temperature to a high temperature of 195°C, a curing temperature, at a rate of 10°C / h and kept warm for 14 hours.

[0078] S5 kiln placement

[0079] After the insulation time is up, the tunnel kiln is allowed to cool naturally to room temperature, and the drying rack with the grinding wheel blank is pushed out. The grinding wheel is then taken out of the drying rack, marked for production, and placed in the corresponding specified position.

[0080] Compared with Example 1, this embodiment uses white corundum-plated iridium abrasives with different abrasive grain sizes, and additional corresponding magnesium oxide and iron sulfide fillers are added to increase the heat resistance and cutting performance of the binder mixed with the abrasive, maintain the fine cutting of the abrasive, and further improve the smoothness of the processed surface. The stirring speed, stirring time, and processing temperature are adjusted accordingly according to the differences in abrasives, binders, and fillers to ensure the use strength of the cutting wheel prepared at this abrasive grain size.

[0081] The beneficial effects of the present invention are as follows: the cutting grinding wheel is an ultra-thin cutting tool made of fine-grained white corundum-plated iridium abrasive, modified phenolic resin, filler, etc. through mixing, high temperature, sintering, and curing processes. It has the advantages of high hardness, high wear resistance, sharp cutting edge, and good processing surface finish, improves the performance and wear resistance of the abrasive, and improves the sharpness and grinding efficiency of the cutting grinding wheel.

[0082] What has been described above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention.

Claims

1. A white corundum iridium-plated abrasive cutting wheel, characterized in that: The invention comprises the following components by mass percentage: white corundum-plated iridium abrasive: 52.4%-56.7%, glass fiber mesh: 10.5%-14.9%, binder: 16.5%-20.2%, filler: 11.8%-16%, the white corundum-plated iridium abrasive adopts 24 # —60 # The abrasive particle size is 200 g / cm2, the binder is a phenolic resin, including a liquid phenolic resin and a powdered phenolic resin, and the mass ratio of the liquid phenolic resin to the powdered phenolic resin is 1:(1.7-2.8), and the filler is one or a combination of calcium sulfate whiskers, potassium cryolite, magnesium oxide, and iron sulfide.

2. The white corundum iridium-plated abrasive cutting wheel according to claim 1, characterized in that: The fillers are calcium sulfate whiskers and potassium cryolite, and the mass ratio of the calcium sulfate whiskers to the potassium cryolite is 1:(2.8-4.9).

3. A white corundum iridium-plated abrasive cutting wheel according to claim 2, characterized in that: The invention also includes a colorant, which accounts for 0.3%-0.7% of the total mass percentage. The colorant is one of iron red, titanium white and carbon black.

4. A white corundum-iridium-plated abrasive cutting wheel according to claim 3, characterized in that: The white corundum iridium-plated abrasive adopts 24 # —36 # Abrasive particle size.

5. The white corundum-iridium-plated abrasive cutting wheel according to claim 3, characterized in that: The white corundum iridium-plated abrasive adopts 46 # —54 # Abrasive particle size.

6. A white corundum-iridium-plated abrasive cutting wheel according to any one of claims 1 to 5, characterized in that: The binder is a modified phenolic resin and accounts for 17.8%-18.5% of the total mass percentage; the liquid phenolic resin is a thermosetting phenolic resin in a liquid state; and the powdered phenolic resin is a thermoplastic phenolic resin in a powdered state.

7. The method for preparing a white corundum-iridium-plated abrasive cutting wheel according to claim 6, characterized in that: The following steps are involved: S1 Raw material configuration (a) Weigh the corresponding weight of white corundum-coated iridium abrasive according to the applicable cutting requirements, and filter through the sieve to select 46 # —54 # White corundum-plated iridium abrasive with an abrasive particle size of , and then add liquid phenolic resin of corresponding mass percentage and put it and the white corundum-plated iridium abrasive into No. 1 mixer for stirring at the same time. The stirring time is 15min-30min and the stirring speed is 120rpm-135rpm, so that the white corundum-plated iridium abrasive can be evenly dispersed in the liquid phenolic resin to form a liquid mixture for standby use. (b) A powdered phenolic resin of a corresponding weight is selected according to a mass ratio of 1:2 to the liquid phenolic resin and added to a No. 2 mixer, and calcium sulfate whiskers and potassium cryolite of a mass ratio of 1:3.8 are sequentially added and stirred. A colorant is then added to the mixer and mixed. The stirring time is 6 min-10 min and the stirring speed is 45 rpm-55 rpm to form a powder additive for use. (c) The powder additive in the second mixer is introduced into the liquid mixture in the first mixer and mixed with each other. The mixture is fully mixed by the mixer for 50-60 minutes at a stirring speed of 80-100 rpm. The mixture is allowed to stand for 20-24 hours after mixing. # —12 # The purpose of the sieve hole to obtain the molding material. S2 Billet Forming The mixed loose molding material is evenly spread into the pressing mold cavity, and is scraped flat by a scraper. Then, glass fiber mesh and grinding wheel hole ring are added in turn, and the molding is pressed by a hydraulic press. The molding pressure is 10Mpa-13Mpa, so that the molding material flows and quickly fills the entire cavity, and the molding material is gradually solidified into a blank in the mold cavity. Finally, the mold is unloaded and the grinding wheel blank is taken out. The grinding wheel blank thickness is ≤1.2mm, the grinding wheel blank outer diameter is 115mm-125mm, and the grinding wheel blank end face runout is ≤0.6mm. S3 blank placement Put the pressed grinding wheel blanks on the drying rack, connect them in series through string rods, and stack them with pads and nets. Put a net on each grinding wheel blank, and separate every 5-10 grinding wheel blanks with a flat aluminum pad. Each string rod can hold 50 to 100 grinding wheel blanks and a spring on top. There is a detachable counterweight in the string rod, and the counterweight is located above the spring. S4 sintering and curing The drying rack with the grinding wheel blank is placed in the tunnel kiln and heated according to the specified curve to harden the blank into a grinding wheel product that meets the standards. It is then transported in the tunnel kiln at a speed of 1m / h. At the same time, the temperature is gradually heated from a low temperature to a high temperature of 180℃-195℃, a curing temperature, at a rate of 10℃ / h, and kept warm for 12h-15h. S5 kiln placement After the insulation time is up, the tunnel kiln is allowed to cool naturally to room temperature, and the drying rack with the grinding wheel blank is pushed out. The grinding wheel is then taken out from the drying rack, marked for production, and placed in the corresponding specified position.

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