A superhard ceramic grinding wheel for double-end grinding of cermet tools and its preparation method

Abstract

This invention discloses a superhard ceramic grinding wheel for double-face grinding of cermet tools and its preparation method, comprising a matrix and abrasive segments. The abrasive segment bonding agent system is a low-temperature nanocrystalline glass bond, the main abrasive is diamond, and the auxiliary abrasive is microcrystalline corundum. The solution of this invention significantly reduces the occurrence of workpiece burn-out and chipping during the grinding of cermet workpieces, while also improving processing efficiency and grinding wheel lifespan. This invention also discloses a method for preparing the aforementioned superhard ceramic grinding wheel specifically for double-face grinding of cermet tools.

Description

Technical Field

[0001] This invention relates to a superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools and its preparation method. Background Technology

[0002] Cermet-grade cutting tools are a new type of material used in modern metal cutting. They not only improve production efficiency and enable the machining of ultra-hard materials that ordinary cutting tools cannot, but also complement existing cutting tools, representing a new force in the cutting tool family and holding a very important position in the machining industry. In general turning operations, cemented carbide is the preferred cutting tool material for most machine manufacturers. However, in certain finishing applications, the wear resistance and cutting edge sharpness of traditional cemented carbide cutting tools often fail to simultaneously meet the requirements of small dimensional tolerances, high surface quality, and high production efficiency. Using cermet-grade cutting tools is a direct and effective way to solve this problem.

[0003] Compared with traditional carbide cutting tools, cermet cutting tool materials are more sensitive to impact and vibration loads. Therefore, during the grinding process of cermet cutting tools, the workpiece is prone to chipping or burning. At the same time, due to the good wear resistance of cermet materials, the surface of traditional grinding wheels is also prone to passivation and failure during the grinding process, and the grinding efficiency is difficult to meet the processing requirements. At present, the grinding process of cermet cutting tools in China is still a technical challenge. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the purpose of this invention is to provide a special ceramic bond superhard grinding wheel that can efficiently grind the two end faces of metal ceramic products. Using this grinding wheel can significantly reduce the occurrence of wheel surface passivation failure and workpiece chipping during precision grinding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A superhard ceramic grinding wheel for double-sided grinding of cermet cutting tools includes a matrix and abrasive segments. The raw materials for preparing the abrasive segments include a nanocrystalline glass binder, a main abrasive, an auxiliary abrasive, a pore-forming agent, and a temporary binder. The binder includes SiO2, Al2O3, B2O3, Na2O, K2O, nano-titanium dioxide, and additives. The additives are one or more of feldspar, ZnO, Li2O, nano-zirconium dioxide, and spodumene. Preferably, the raw materials for preparing the abrasive segments are a nanocrystalline glass binder, a main abrasive, an auxiliary abrasive, a pore-forming agent, and a temporary binder.

[0007] In the above technical solution, the glass binder is composed of SiO2, Al2O3, B2O3, Na2O, K2O, nano-titanium dioxide, and additives. The additives are one or more of feldspar, ZnO, Li2O, nano-zirconium dioxide, and spodumene. Preferably, the additives include spodumene, and more preferably, the amount of spodumene is 3-7% of the total mass of the nanocrystalline glass binder. Preferably, SiO2, Al2O3, B2O3, Na2O, K2O, nano-titanium dioxide, and additives are melted and then ball-milled to obtain the nanocrystalline glass binder with a particle size of less than 500 nanometers. The binder has good holding power for the abrasive, moderate fluidity, and the sintering temperature of the grinding wheel is below 800℃, which is beneficial for energy saving and environmental protection.

[0008] In the above technical solution, the main abrasive is diamond; the auxiliary abrasive is microcrystalline corundum; the temporary binder is phenolic resin liquid or sodium silicate; and the pore-forming agent is hawthorn shell powder or jujube shell powder.

[0009] In the above technical solution, the substrate is an existing product, such as a steel substrate, cast iron substrate, aluminum substrate, or aluminum alloy substrate; the outer diameter of the substrate is 500-2000mm, one side of the substrate is provided with threaded mounting holes, and the other side is bonded with abrasive blocks, which is a conventional technology.

[0010] In the above technical solution, the mass percentages of SiO2, Al2O3, B2O3, Na2O, K2O, nano-titanium dioxide, and additives are as follows (total amount 100%):

[0011] SiO2 40-65%

[0012] Al2O3 5-15%

[0013] B2O3 10~20%

[0014] Na2O 2~10%

[0015] K2O 2~7%

[0016] Nano titanium dioxide 1-8%

[0017] Additive balance.

[0018] Preferably, the mass percentages of SiO2, Al2O3, B2O3, Na2O, K2O, nano-titanium dioxide, and additives are as follows (total 100%):

[0019] SiO2 50-60%

[0020] Al2O3 7-10%

[0021] B2O3 10-15%

[0022] Na2O 4-6%

[0023] K2O 3-5%

[0024] Nano titanium dioxide 2-5%

[0025] Additive balance.

[0026] In the above technical solution, the volume percentage of the raw materials for preparing the abrasive segments is as follows (total volume is 100%):

[0027] Diamond 10-50%

[0028] Nanocrystalline glass binder 10-30%

[0029] Abrasive additives: 10-30%

[0030] Pore-forming agent 2-20%

[0031] Remaining amount of temporary adhesive.

[0032] Preferably, the volume percentage of the raw materials for preparing the abrasive segments is as follows (total volume is 100%):

[0033] Diamond 35-45%

[0034] Nanocrystalline glass binder 25-30%

[0035] Abrasive additive 15-20%

[0036] 5-10% pore-forming agent

[0037] Remaining amount of temporary adhesive.

[0038] The preparation method of the above-mentioned superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools includes the following steps: cold pressing a mixture of nanocrystalline glass binder, main abrasive, auxiliary abrasive, pore-forming agent and temporary binder to obtain an abrasive segment blank; then sintering the abrasive segment blank to obtain an abrasive segment; bonding the abrasive segment to a substrate to obtain a superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools; wherein, the sintering temperature is below 850℃.

[0039] In the above technical solution, the nanocrystalline glass binder, main abrasive, auxiliary abrasive, and pore-forming agent are mixed, and then a temporary binder is added and the mixture is continued to be mixed to obtain a mixture; preferably, the mixing time is 10 to 120 minutes; after mixing, the mixture is sieved to prepare the mixture.

[0040] In the above technical solution, the sintering process is as follows: heating from room temperature to 650-700°C for 0.8-1.2 hours, holding at that temperature for 0.8-1.2 hours, then heating to 750-830°C for another 0.8-1.2 hours, holding at that temperature for another 0.8-1.2 hours, then cooling to 660°C for another 0.8-1.2 hours, then heating to 720-800°C for another 0.8-1.2 hours, holding at that temperature for another 0.8-1.2 hours, and finally cooling naturally to room temperature.

[0041] In the above technical solution, bonding the abrasive segments to the substrate is a conventional technique. Generally, it involves conventional adhesive bonding followed by room temperature curing to obtain a superhard ceramic grinding wheel for double-end grinding of metal-ceramic cutting tools. Those skilled in the art can achieve bonding of abrasive segments to the substrate using conventional methods.

[0042] As is common sense, the abrasive blocks are bonded to the substrate, cured in a conventional manner, and then processed in a conventional manner to obtain a superhard ceramic grinding wheel for grinding the double-end faces of metal-ceramic cutting tools.

[0043] This invention discloses the application of the above-mentioned superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools or the abrasive block of the superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools in the processing of metal-ceramic workpieces; preferably, the processing is grinding processing, specifically end face grinding, and more specifically double-end face grinding.

[0044] This invention discloses a method for processing metal-ceramic workpieces, which uses a superhard ceramic grinding wheel with double-end face grinding of the metal-ceramic tool to grind the metal-ceramic workpiece, thereby completing the processing of the metal-ceramic workpiece.

[0045] The beneficial effects of this invention are as follows: The ceramic binder disclosed in this invention is a low-temperature nanocrystalline glass binder. Nanocrystalline glass binders have advantages such as high strength and good wettability to abrasives, which can significantly reduce the sintering temperature, making them more energy-efficient and environmentally friendly. When used in combination with abrasives and pore-forming agents, they can greatly improve the wear resistance and service life of the grinding wheel. The superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools prepared by this invention also has good sharpness and shape retention, high grinding efficiency, and is less prone to extrusion grinding during the grinding process, resulting in very small chipping on the metal-ceramic workpiece.

[0046] The above solution significantly reduces the occurrence of chipping and workpiece burning during the grinding process of metal-ceramic workpieces, while also improving processing efficiency. The products are energy-saving and environmentally friendly, which is conducive to promotion. Attached Figure Description

[0047] Figure 1 This is a photograph of the grinding wheel of the present invention used to process metal-ceramic workpieces.

[0048] Figure 2The image shows a photograph of the processed product used as an example.

[0049] Figure 3 Photos of existing grinding wheel-processed products. Detailed Implementation

[0050] The present invention discloses a method for preparing a superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools, comprising the following steps:

[0051] (1) Mix diamond, nanocrystalline glass binder, auxiliary abrasive and pore-forming agent, then add temporary binder and continue mixing for 10-120 minutes. After passing through a 60-120# sieve, prepare the mixture.

[0052] The low-temperature nanocrystalline glass binder includes SiO2, Al2O3, B2O3, Na2O, K2O, nano titanium dioxide, and additives, wherein the additives are one or more of feldspar, ZnO, Li2O, nano zirconium dioxide, and spodumene.

[0053] (2) The mixture is put into the mold, evenly added, leveled, and cold-pressed to prepare the abrasive block blank;

[0054] (3) The abrasive block blank is sintered and naturally cooled to room temperature to prepare abrasive blocks, which are abrasive blocks for superhard ceramic grinding wheels for double-end face grinding of metal ceramic tools;

[0055] The sintering process is as follows: the temperature is raised from room temperature to 650-700℃ in 1 hour, held for 1 hour, then raised to 750-830℃ in 1 hour, held for 1 hour, then lowered to 660℃ in 1 hour, held for 1 hour, then raised to 720-800℃ in 1 hour, held for 1 hour, and then naturally cooled to room temperature.

[0056] (4) Bond the abrasive blocks to the substrate and cure at room temperature to prepare a grinding wheel blank;

[0057] (5) The grinding wheel blank is processed to obtain a superhard ceramic grinding wheel for grinding the double end face of metal ceramic tools.

[0058] Specifically, the superhard ceramic grinding wheel for grinding the double-end faces of metal-ceramic cutting tools disclosed in this invention includes a matrix and abrasive segments; the preparation method of the superhard ceramic grinding wheel for grinding the double-end faces of metal-ceramic cutting tools includes the following steps:

[0059] Step 1: Mixing. By volume percentage, mix diamond, nanocrystalline glass binder, abrasive, and pore-forming agent for 1-10 minutes. Then add temporary binder and continue mixing for 10-120 minutes. Pass the mixture through a 60-120# sieve to obtain the mixture for later use.

[0060] The second step is molding. The mixture is put into a conventional mold, evenly distributed, leveled, and then placed on the operating table of a 60-ton press to flatten it into an abrasive block blank.

[0061] The third step is sintering. The abrasive segment blank is placed in a sintering furnace and heated from room temperature to 650-700°C for 1 hour, held for 1 hour, then heated to 750-830°C for 1 hour, held for 1 hour, then cooled to 660°C for 1 hour, then heated to 720-800°C for 1 hour, held for 1 hour, and then cooled naturally to room temperature to obtain the abrasive segment.

[0062] Step 4: Bonding. Use epoxy resin adhesive to bond the abrasive blocks to the substrate and cure at room temperature for more than 12 hours to obtain the grinding wheel blank.

[0063] Step 5: Machining. The grinding wheel blank is machined on a CNC grinding machine to the required shape and size, thus obtaining a special ceramic superhard grinding wheel for double-end grinding of metal and ceramic products.

[0064] Step 6: Inspection and warehousing. After passing the inspection, the above-mentioned special ceramic superhard grinding wheels for double-end grinding of metal and ceramic products are put into storage for future use.

[0065] Steps four through six described above are existing techniques and can be performed using conventional grinding wheel methods. The specific operations do not affect the technological advancements brought about by this invention. The technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0066] The raw materials used in this invention are existing products that meet the conventional requirements for grinding wheel preparation; the specific preparation operations and performance testing are conventional techniques.

[0067] This invention involves melting several oxides together at high temperature (1500-1700℃, preferably 1600℃), and then ball milling them into a binder. Preferably, the ball milling step involves placing the binder and zirconia balls in a planetary ball mill jar at a mass ratio of 1:(5-15), adding water of the same weight as the binder, ball milling for 4-5 hours, then sieving, and drying the slurry in an oven at 120℃ to obtain a nanocrystalline glass binder with a particle size of less than 500 nanometers.

[0068] The following are the preparation steps for the grinding wheel in the example (the corresponding steps or raw materials may be omitted depending on the formula):

[0069] The raw materials for preparing the nanocrystalline glass binder are melted together at 1600℃ and then ball-milled to obtain the binder. The ball milling steps are as follows: the binder and zirconia balls are placed in a planetary ball mill jar at a mass ratio of 1:10, water of the same weight as the binder is added, and the ball milling is carried out for 4.5 hours. The mixture is then sieved, and the slurry is placed in an oven and dried at 120℃ to obtain the nanocrystalline glass binder.

[0070] Step 1: Mixing. By volume percentage, place diamond abrasive, nano-microcrystalline glass binder, microcrystalline corundum, pore-forming agent hawthorn shell powder into a mixer and stir. After mixing evenly, add phenolic resin liquid and continue mixing for 1 hour. First, pass through a 60# sieve, then through a 120# sieve to form a mixture and place it in a container for later use.

[0071] The second step is molding. The mixture is put into the corresponding mold, evenly distributed, leveled, and then placed on the operating table of a 60-ton press to flatten it into an abrasive block blank.

[0072] The third step is sintering. The abrasive segment blank is placed in a sintering furnace (air). The temperature is raised from room temperature to 680°C in 1 hour, held for 1 hour, then raised to 800°C in 1 hour, held for 1 hour, then lowered to 660°C in 1 hour, held for 1 hour, then raised to 760°C in 1 hour, held for 1 hour, and then naturally cooled to room temperature to obtain the abrasive segment.

[0073] Step 4: Bonding. Use epoxy resin adhesive to bond the abrasive blocks to the substrate and cure at room temperature for 12 hours to obtain the grinding wheel blank.

[0074] Step 5: Machining. The grinding wheel blank is machined on a CNC grinding machine to the required shape and size, thus obtaining a special ceramic superhard grinding wheel for double-end grinding of metal and ceramic products.

[0075] Step 6: Inspection and warehousing. After passing the inspection, the above-mentioned superhard ceramic grinding wheels for double-end grinding of metal-ceramic cutting tools are put into storage for future use.

[0076] The machining steps for metal-ceramic workpieces using the grinding wheel of this invention are conventional methods, and are briefly described below:

[0077] 1. Install the superhard ceramic grinding wheel, specially designed for grinding the double-end faces of metal-ceramic cutting tools, onto the AM-ADL double-end face grinding equipment;

[0078] 2. Use a flatness gauge to measure the flatness of the grinding wheel, ensuring that the flatness is within 0.05mm;

[0079] 3. Place five metal-ceramic workpiece carriers evenly on the double-end grinding wheel, and place the workpieces inside the carriers. (See below) Figure 1 ;

[0080] 4. Set the required grinding parameters and perform grinding. The equipment will stop automatically when the set size is reached. Generally, the grinding pressure is 0.35MPa, the upper and lower grinding wheel speeds are 40rpm, and the inner ring speed is 25rpm.

[0081] 5. Measure the workpiece dimensions and chip size (production requirement is less than 25 micrometers, internal control is 20 micrometers). If the requirements are met, the workpiece can be removed.

[0082] 6. Place the new workpiece and continue grinding until the grinding time increases to more than three times the grinding time of the first disc. Then dress the grinding wheel again. The total number of discs that can be ground with one dressing is the dressing interval. Example 1

[0083] A superhard ceramic grinding wheel for grinding the double-end faces of cermet cutting tools includes a matrix and abrasive segments. The raw materials for preparing the abrasive segments have the following volume percentage composition:

[0084] 35% diamond

[0085] 30% nanocrystalline glass binder

[0086] Microcrystalline corundum 17%

[0087] 10% pore-forming agent

[0088] 8% phenolic resin solution

[0089] The matrix is ​​steel-based. The raw materials for preparing the above-mentioned nanocrystalline glass binder are SiO2, Al2O3, B2O3, Na2O, K2O, nano-titanium dioxide, and additives. The additives are spodumene, ZnO, and nano-zirconium dioxide. The mass percentage of each component is as follows:

[0090] SiO2 60%

[0091] Al2O3 8%

[0092] B2O3 13%

[0093] Na2O 4%

[0094] K2O 4%

[0095] Nano titanium dioxide 2%

[0096] ZnO 2%

[0097] 2% nano-zirconium dioxide

[0098] 5% spodumene

[0099] The superhard grinding wheel prepared in this embodiment is installed on an AM-ADL700 grinding machine. Each disc holds 120 workpieces, and the average cycle time for processing one disc of metal-ceramic workpieces is 2 minutes. The dressing interval is once every 25 discs. The workpiece chipping is less than 0.018mm. (See [link to documentation]). Figure 2 It is evident that the processing effect is very good; the lifespan of the double-ended grinding wheel with an outer diameter of 700mm is approximately 600,000 workpieces. Example 2

[0100] The raw materials for preparing abrasive segments consist of the following components by volume percentage:

[0101] 45% diamond

[0102] 25% nanocrystalline glass binder

[0103] Microcrystalline corundum 20%

[0104] 5% pore-forming agent

[0105] 5% phenolic resin solution

[0106] The matrix is ​​steel-based. The raw materials for preparing the above-mentioned nanocrystalline glass binder are SiO2, Al2O3, B2O3, Na2O, nano-titanium dioxide, and additives, wherein the additives are feldspar and spodumene. The mass percentage of each component is as follows:

[0107] SiO2 54%

[0108] Al2O3 8%

[0109] B2O3 10%

[0110] Na2O 6%

[0111] K2O 4%

[0112] Nano titanium dioxide 5%

[0113] Feldspar 8%

[0114] 5% spodumene

[0115] The superhard grinding wheel prepared above is installed on the AM-ADL1000 grinding equipment. Each disc holds 210 workpieces, and the average cycle time for processing one disc of metal-ceramic workpieces is about 2 minutes. The dressing interval can be once every 30 discs. The chipping of the workpiece is less than 0.02mm, and the life of the double-ended grinding wheel with an outer diameter of 1000mm is about 1.2 million workpieces. Example 3

[0116] The rest is the same as in Example 2, except that the substrate is replaced with one of cast iron substrate, aluminum substrate or aluminum alloy substrate, and the processing effect is equivalent.

[0117] Comparative Example 1

[0118] The difference from Example 1 is that the glass binder is Na2O, K2O, SiO2, Al2O3, and MgO, and the mass percentage of each component is as follows:

[0119] SiO2 65%

[0120] Al2O3 20%

[0121] K2O 8%

[0122] Na2O 5%

[0123] MgO 2%

[0124] The rest is the same as in Example 1. The average cycle time of the superhard grinding wheel prepared in this comparative example for processing one batch of metal-ceramic workpieces is 10 minutes, the dressing interval is once every 3 batches, and the workpiece chipping is 0.05mm. Since the quality of the workpieces produced by grinding is not up to standard, the life test was not continued.

[0125] Comparative Example 2

[0126] The difference from Example 2 is that the glass binder is Na2O, CaO, SiO2, Al2O3, and Fe2O3, and the mass percentage of each component is as follows:

[0127] SiO2 60%

[0128] Al2O3 22%

[0129] CaO 6.5%

[0130] Na2O 10%

[0131] Fe2O3 1.5%

[0132] The rest is the same as in Example 2. The average cycle time for the superhard grinding wheel prepared in this comparative example to process one batch of metal-ceramic workpieces is 15 minutes, and the dressing interval is only once every two batches. The workpiece chipping is 0.06mm. Since the quality of the workpieces produced by grinding is not up to standard, the life test was not continued.

[0133] Comparative Example 3

[0134] The machining effect of commercially available grinding wheels for machining metal and ceramic tools is as follows: Figure 3 Compared with Example 1, this grinding wheel exhibits a larger chipping effect. This grinding wheel is currently the best performing one in the manufacturer's production.

[0135] Comparative Example 4

[0136] Based on Example 1, the additives were omitted while everything else remained the same, resulting in a significant decrease in the service life of the grinding wheel; the life of a double-ended grinding wheel with an outer diameter of 700mm was approximately 230,000 workpieces.

[0137] Comparative Example 5

[0138] Based on Example 1, the microcrystalline corundum is omitted, but everything else remains the same. The dressing interval is once every 13 discs.

[0139] Comparative Example 6

[0140] Based on Example 1, spodumene was replaced with feldspar, and everything else remained the same. The workpiece chipping was 0.031mm, and the service life of the grinding wheel decreased; the service life of a double-ended grinding wheel with an outer diameter of 700mm was approximately 470,000 workpieces.

[0141] This invention employs a novel ceramic binder: a low-temperature nanocrystalline glass binder. This nanocrystalline glass binder possesses advantages such as high strength and excellent abrasive wettability. Combined with the abrasive and pore-forming agent, it significantly improves the wear resistance of the grinding wheel, thereby greatly extending its service life. Furthermore, the low-temperature binder can significantly reduce the sintering temperature, making it more energy-efficient and environmentally friendly. The superhard ceramic grinding wheel prepared by this invention for double-end face grinding of metal-ceramic cutting tools also exhibits excellent sharpness and shape retention, high grinding efficiency, and is less prone to extrusion grinding during the grinding process, resulting in very small chipping on the ground metal-ceramic workpiece.

Claims

1. A superhard ceramic grinding wheel for double-end grinding of metal-ceramic cutting tools, comprising a matrix and abrasive segments, characterized in that, The raw materials for preparing the abrasive segments include a nanocrystalline glass binder, a main abrasive, an auxiliary abrasive, a pore-forming agent, and a temporary binder; the nanocrystalline glass binder includes SiO2, Al2O3, B2O3, Na2O, K2O, nano titanium dioxide, and additives, wherein the additives are ZnO, nano zirconium dioxide, and spodumene; the main abrasive is diamond; the auxiliary abrasive is microcrystalline corundum; the temporary binder is phenolic resin liquid or sodium silicate; the pore-forming agent is hawthorn shell powder or jujube shell powder; the mass percentages of SiO2, Al2O3, B2O3, Na2O, K2O, nano titanium dioxide, and additives are: SiO2 40-65% Al2O3 5-15% B2O3 10~20% Na2O 2~10% K2O 2~7% Nano titanium dioxide 1-8% Additive balance.

2. The superhard ceramic grinding wheel for double-end face grinding of cermet cutting tools according to claim 1, characterized in that, The volume percentages of the raw materials used to prepare the abrasive segments are as follows: Diamond 10-50% Nanocrystalline glass binder 10-30% Abrasive additives: 10-30% Pore-forming agent 2-20% Remaining amount of temporary adhesive.

3. The method for preparing the superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools as described in claim 1, characterized in that, The process includes the following steps: cold pressing a mixture of nanocrystalline glass binder, main abrasive, auxiliary abrasive, pore-forming agent, and temporary adhesive to obtain an abrasive segment blank; then sintering the abrasive segment blank to obtain an abrasive segment; and bonding the abrasive segment to a substrate to obtain a superhard ceramic grinding wheel for double-end face grinding of cermet tools; wherein the sintering temperature is below 850℃.

4. The method for preparing the superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools according to claim 3, characterized in that, The nanocrystalline glass binder, main abrasive, auxiliary abrasive, and pore-forming agent are mixed, then a temporary binder is added, and mixing continues to obtain the mixture.

5. The method for preparing the superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools according to claim 3, characterized in that, The sintering process involves heating from room temperature to 650-700°C over 0.8-1.2 hours, holding at that temperature for 0.8-1.2 hours, then heating to 750-830°C over another 0.8-1.2 hours, holding at that temperature for 0.8-1.2 hours, then cooling to 660°C, holding at that temperature for 0.8-1.2 hours, then heating to 720-800°C over another 0.8-1.2 hours, and finally allowing it to cool naturally to room temperature.

6. A block of superhard ceramic abrasive wheel for grinding double-end faces of metal-ceramic cutting tools, characterized in that, The raw materials for preparing the abrasive segments include a nanocrystalline glass binder, a main abrasive, an auxiliary abrasive, a pore-forming agent, and a temporary binder; the nanocrystalline glass binder includes SiO2, Al2O3, B2O3, Na2O, K2O, nano titanium dioxide, and additives, wherein the additives are ZnO, nano zirconium dioxide, and spodumene; the main abrasive is diamond; the auxiliary abrasive is microcrystalline corundum; the temporary binder is phenolic resin liquid or sodium silicate; the pore-forming agent is hawthorn shell powder or jujube shell powder; the mass percentages of SiO2, Al2O3, B2O3, Na2O, K2O, nano titanium dioxide, and additives are: SiO2 40-65% Al2O3 5-15% B2O3 10~20% Na2O 2~10% K2O 2~7% Nano titanium dioxide 1-8% Additive balance.

7. The application of the superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools as described in claim 1 or the abrasive block of the superhard ceramic grinding wheel for double-end face grinding of metal-ceramic cutting tools as described in claim 6 in the machining of metal-ceramic workpieces.

8. A method for processing metal-ceramic workpieces, characterized in that, The metal-ceramic workpiece is ground using the superhard ceramic grinding wheel for double-end face grinding of the metal-ceramic cutting tool as described in claim 1, thereby completing the machining of the metal-ceramic workpiece.

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