Ceramic thread tooth position machining method

Abstract

The invention discloses a ceramic thread tooth position machining method, and belongs to the technical field of ceramic thread tooth position machining. A carborundum cutter is adopted for cutting a ceramic workpiece, and the hardness of the carborundum cutter is far higher than that of a ceramic material, so that the long service life can be maintained when the hard and brittle ceramic material is cut; meanwhile, less heat is generated in the cutting process, the dimensional precision and the surface quality of the workpiece can be kept, the micro-emulsified cutting fluid is matched for use, the micro-emulsified cutting fluid has cleaning performance and transparency, the surface state of the workpiece can be observed easily, and the working efficiency is improved. The microemulsion cutting fluid overcomes the defects that a traditional cutting fluid is prone to deterioration and poor in cleaning performance and transparency and a fully-synthetic cutting fluid is poor in lubrication, and is high in permeability, so that the microemulsion cutting fluid fully infiltrates the wall of a threaded hole to be machined to form a certain permeable emulsion layer, ceramic fiber chippings are not prone to edge breakage, the machining requirements of high-hardness and high-strength hard and brittle materials are met, and the service life of the threaded hole to be machined is prolonged. And the qualification rate of ceramic products is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic thread position processing, and in particular relates to a ceramic thread position processing method. Background Art

[0002] Ceramic materials have the characteristics of high hardness and high strength, and are difficult to process. Traditional ceramic material threads are usually processed by grinding or cutting, and water-soluble lubricating additives are mixed with conventional coolants, and the resulting cutting fluid is sprayed onto the ceramic workpiece. However, water-soluble cutting fluids have poor lubricity, resulting in long processing time and rapid tool consumption. It is easy to burn the tool when processing deep threads, and it is easy to cause notches and broken edges on the thread teeth. The processing stability is poor, resulting in a low pass rate for ceramic products. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a ceramic thread position processing method, which solves the problem that the threads of traditional ceramic materials are usually processed by grinding or cutting, and a water-soluble lubricating additive is mixed with a conventional coolant, and the obtained cutting fluid is sprayed onto the ceramic workpiece. However, the water-soluble cutting fluid has poor lubricity, resulting in a long processing time and fast tool consumption. It is easy to burn the tool when processing deep threads, and it is easy to cause notches and broken edges on the thread teeth, and the processing stability is poor.

[0004] To achieve the above object, the present invention provides the following technical solution: a ceramic thread position processing method, the processing method comprising the following steps:

[0005] S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis.

[0006] S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece;

[0007] S3, prepare micro-emulsified cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the micro-emulsified cutting fluid;

[0008] S4, adjusting the feed speed, tool speed and cutting amount of the cutting tool to the ceramic workpiece through the CNC, starting the CNC to make the cutting tool perform thread processing on the inner wall of the ceramic workpiece, and the configured micro-emulsified cutting fluid infiltrates the threaded hole wall;

[0009] S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards;

[0010] S6. Deposit silicon carbide coating on the ceramic workpiece, and then clean the ceramic workpiece and try to fit the NIHS thread gauge.

[0011] As a further solution of the present invention: in S2, the cutting tool is a cemented carbide tool and a diamond tool.

[0012] As a further solution of the present invention: in S3, the microemulsified cutting fluid is prepared by mixing the following raw materials in parts by weight:

[0013] 5-10 parts of triethanolamine oleate, 5-10 parts of nonionic surfactant A, 3-8 parts of nonionic surfactant B, 15-20 parts of base oil, 10-20 parts of lubricating additive, 5-10 parts of extreme pressure agent, 5-15 parts of rust inhibitor, 0.5-2 parts of bactericide, 0.2-0.5 parts of defoaming agent and 30-50 parts of water.

[0014] As a further embodiment of the present invention: the nonionic surfactant A is one or more of low-foaming nonionic PO-EO-PO type block copolymer or Nonidet SF-5;

[0015] The nonionic surfactant B is one or more of alkylolamide, polyol monofatty acid ester or polyoxyethylene-polyoxypropylene copolymer;

[0016] The base oil is a cycloparaffin base oil;

[0017] The lubricating additive is ricinoleic acid polyester;

[0018] The extreme pressure agent is an organic borate containing sulfur and nitrogen;

[0019] The rust inhibitor is prepared by mixing triethanolamine and sebacic acid, and the mass ratio of triethanolamine to sebacic acid is 1:1;

[0020] The bactericide is BK bactericide or MBM bactericide.

[0021] As a further solution of the present invention: in S6, the process parameters for deposition of the silicon carbide coating are:

[0022] The deposition temperature is 950-1000° C., the deposition time is 30-35 hours, and the reaction gas introduced during the deposition of the silicon carbide coating is one of argon and hydrogen.

[0023] As a further solution of the present invention: in S6, the NIHS thread go / no-go gauge steps are as follows:

[0024] Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: by using a carborundum tool to cut the ceramic workpiece, since the hardness of the carborundum tool is much higher than that of the ceramic material, the cutting force is reduced and the processing efficiency is improved; since the carborundum tool has good wear resistance, it can maintain a longer service life when cutting hard and brittle ceramic materials, reducing the frequency of tool replacement; at the same time, less heat is generated during the cutting process, which helps to maintain the dimensional accuracy and surface quality of the workpiece; in combination with the use of microemulsion cutting fluid, the microemulsion cutting fluid can form a lubricating film on the workpiece, and has cleaning and transparency, which is conducive to observing the surface state of the workpiece; the microemulsion cutting fluid overcomes the shortcomings of traditional cutting fluids that are easy to deteriorate, have poor cleaning and transparency, and have poor lubrication of fully synthetic cutting fluids, and has strong permeability, so that the microemulsion cutting fluid fully infiltrates the wall of the threaded hole to be processed, forming a certain penetration emulsion layer, and ceramic fiber debris is not prone to edge collapse, meeting the processing requirements of high hardness, high strength hard and brittle materials, and ensuring the qualified rate of ceramic products. DETAILED DESCRIPTION

[0026] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0027] Embodiment 1:

[0028] A ceramic thread position processing method, the processing method comprising the following steps:

[0029] S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis.

[0030] S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece;

[0031] S3, prepare micro-emulsified cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the micro-emulsified cutting fluid;

[0032] S4, adjusting the feed speed, tool speed and cutting amount of the cutting tool to the ceramic workpiece through the CNC, starting the CNC to make the cutting tool perform thread processing on the inner wall of the ceramic workpiece, and the configured micro-emulsified cutting fluid infiltrates the threaded hole wall;

[0033] S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards;

[0034] S6. Deposit silicon carbide coating on the ceramic workpiece, and then clean the ceramic workpiece and try to fit the NIHS thread gauge.

[0035] In S2, the cutting tool is a diamond tool.

[0036] In S3, the microemulsified cutting fluid is prepared by mixing the following raw materials in parts by weight:

[0037] 5-10 parts of triethanolamine oleate, 5-10 parts of nonionic surfactant A, 3-8 parts of nonionic surfactant B, 15-20 parts of base oil, 10-20 parts of lubricating additive, 5-10 parts of extreme pressure agent, 5-15 parts of rust inhibitor, 0.5-2 parts of bactericide, 0.2-0.5 parts of defoaming agent and 30-50 parts of water.

[0038] The nonionic surfactant A is one or more of low-foaming nonionic PO-EO-PO type block copolymer or Nonidet SF-5;

[0039] The nonionic surfactant B is one or more of alkylolamide, polyol monofatty acid ester or polyoxyethylene-polyoxypropylene copolymer;

[0040] The base oil is a cycloparaffin base oil;

[0041] The lubricating additive is ricinoleic acid polyester;

[0042] The extreme pressure agent is an organic borate ester containing sulfur and nitrogen;

[0043] The rust inhibitor is prepared by mixing triethanolamine and sebacic acid, and the mass ratio of triethanolamine to sebacic acid is 1:1;

[0044] The fungicide is BK fungicide or MBM fungicide.

[0045] In S6, the process parameters for silicon carbide coating deposition are:

[0046] The deposition temperature is 950-1000° C., the deposition time is 30-35 hours, and the reaction gas introduced during the deposition of the silicon carbide coating is one of argon and hydrogen.

[0047] In S6, the NIHS thread go and no-go gauge steps are as follows:

[0048] Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

[0049] Embodiment 2:

[0050] A ceramic thread position processing method, the processing method comprising the following steps:

[0051] S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis.

[0052] S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece;

[0053] S3, prepare micro-emulsified cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the micro-emulsified cutting fluid;

[0054] S4, adjusting the feed speed, tool speed and cutting amount of the cutting tool to the ceramic workpiece through the CNC, starting the CNC to make the cutting tool perform thread processing on the inner wall of the ceramic workpiece, and the configured micro-emulsified cutting fluid infiltrates the threaded hole wall;

[0055] S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards;

[0056] S6. Deposit silicon carbide coating on the ceramic workpiece, and then clean the ceramic workpiece and try to fit the NIHS thread gauge.

[0057] In S2, the cutting tool is a cemented carbide tool.

[0058] In S3, the microemulsified cutting fluid is prepared by mixing the following raw materials in parts by weight:

[0059] 5-10 parts of triethanolamine oleate, 5-10 parts of nonionic surfactant A, 3-8 parts of nonionic surfactant B, 15-20 parts of base oil, 10-20 parts of lubricating additive, 5-10 parts of extreme pressure agent, 5-15 parts of rust inhibitor, 0.5-2 parts of bactericide, 0.2-0.5 parts of defoaming agent and 30-50 parts of water.

[0060] The nonionic surfactant A is one or more of low-foaming nonionic PO-EO-PO type block copolymer or Nonidet SF-5;

[0061] The nonionic surfactant B is one or more of alkylolamide, polyol monofatty acid ester or polyoxyethylene-polyoxypropylene copolymer;

[0062] The base oil is a cycloparaffin base oil;

[0063] The lubricating additive is ricinoleic acid polyester;

[0064] The extreme pressure agent is an organic borate ester containing sulfur and nitrogen;

[0065] The rust inhibitor is prepared by mixing triethanolamine and sebacic acid, and the mass ratio of triethanolamine to sebacic acid is 1:1;

[0066] The fungicide is BK fungicide or MBM fungicide.

[0067] In S6, the process parameters for silicon carbide coating deposition are:

[0068] The deposition temperature is 950-1000° C., the deposition time is 30-35 hours, and the reaction gas introduced during the deposition of the silicon carbide coating is one of argon and hydrogen.

[0069] In S6, the NIHS thread go and no-go gauge steps are as follows:

[0070] Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

[0071] Embodiment 3:

[0072] A ceramic thread position processing method, the processing method comprising the following steps:

[0073] S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis.

[0074] S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece;

[0075] S3, prepare water-soluble cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the water-soluble cutting fluid;

[0076] S4, adjusting the feed speed, tool rotation speed and cutting amount of the cutting tool on the ceramic workpiece through the CNC, starting the CNC so that the cutting tool performs thread processing on the inner wall of the ceramic workpiece, and the configured water-soluble cutting fluid infiltrates the threaded hole wall;

[0077] S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards;

[0078] S6. Deposit silicon carbide coating on the ceramic workpiece, and then clean the ceramic workpiece and try to fit the NIHS thread gauge.

[0079] In S2, the cutting tool is a diamond tool.

[0080] In S3, the water-soluble cutting fluid is a mixture of a water-soluble lubricating additive and a conventional coolant;

[0081] In S6, the process parameters for silicon carbide coating deposition are:

[0082] The deposition temperature is 950-1000° C., the deposition time is 30-35 hours, and the reaction gas introduced during the deposition of the silicon carbide coating is one of argon and hydrogen.

[0083] In S6, the NIHS thread go and no-go gauge steps are as follows:

[0084] Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

[0085] Embodiment 4:

[0086] A ceramic thread position processing method, the processing method comprising the following steps:

[0087] S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis.

[0088] S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece;

[0089] S3, prepare water-soluble cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the water-soluble cutting fluid;

[0090] S4, adjusting the feed speed, tool rotation speed and cutting amount of the cutting tool to the ceramic workpiece through the CNC, starting the CNC to make the cutting tool perform thread processing on the inner wall of the ceramic workpiece, and the configured water-soluble cutting fluid infiltrates the threaded hole wall;

[0091] S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards;

[0092] S6. Deposit silicon carbide coating on the ceramic workpiece, and then clean the ceramic workpiece and try to fit the NIHS thread gauge.

[0093] In S2, the cutting tool is a cemented carbide tool.

[0094] In S3, the water-soluble cutting fluid is a mixture of a water-soluble lubricating additive and a conventional coolant;

[0095] In S6, the process parameters for silicon carbide coating deposition are:

[0096] The deposition temperature is 950-1000° C., the deposition time is 30-35 hours, and the reaction gas introduced during the deposition of the silicon carbide coating is one of argon and hydrogen.

[0097] In S6, the NIHS thread go and no-go gauge steps are as follows:

[0098] Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

[0099] Embodiment 5:

[0100] A ceramic thread position processing method, the processing method comprising the following steps:

[0101] S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis.

[0102] S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece;

[0103] S3, prepare micro-emulsified cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the micro-emulsified cutting fluid;

[0104] S4, adjusting the feed speed, tool speed and cutting amount of the cutting tool to the ceramic workpiece through the CNC, starting the CNC to make the cutting tool perform thread processing on the inner wall of the ceramic workpiece, and the configured micro-emulsified cutting fluid infiltrates the threaded hole wall;

[0105] S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards;

[0106] S6. Clean the ceramic workpiece and try to fit the NIHS thread gauge.

[0107] In S2, the cutting tool is a diamond tool.

[0108] In S3, the microemulsified cutting fluid is prepared by mixing the following raw materials in parts by weight:

[0109] 5-10 parts of triethanolamine oleate, 5-10 parts of nonionic surfactant A, 3-8 parts of nonionic surfactant B, 15-20 parts of base oil, 10-20 parts of lubricating additive, 5-10 parts of extreme pressure agent, 5-15 parts of rust inhibitor, 0.5-2 parts of bactericide, 0.2-0.5 parts of defoaming agent and 30-50 parts of water.

[0110] The nonionic surfactant A is one or more of low-foaming nonionic PO-EO-PO type block copolymer or Nonidet SF-5;

[0111] The nonionic surfactant B is one or more of alkylolamide, polyol monofatty acid ester or polyoxyethylene-polyoxypropylene copolymer;

[0112] The base oil is a cycloparaffin base oil;

[0113] The lubricating additive is ricinoleic acid polyester;

[0114] The extreme pressure agent is an organic borate ester containing sulfur and nitrogen;

[0115] The rust inhibitor is prepared by mixing triethanolamine and sebacic acid, and the mass ratio of triethanolamine to sebacic acid is 1:1;

[0116] The fungicide is BK fungicide or MBM fungicide.

[0117] In S6, the NIHS thread go and no-go gauge steps are as follows:

[0118] Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

[0119] The following table is obtained based on Examples 1-5:

[0120]

[0121] From the comparison in the above table, we can see that:

[0122] Diamond tools are used to process ceramic thread teeth, making their hardness much higher than that of ceramic materials, reducing cutting force and ensuring the quality of ceramic workpiece tooth processing; using carbide tools to process ceramic workpieces makes it easy for defects to appear on the teeth, making it difficult to ensure the qualified rate of ceramic products;

[0123] Micro-emulsified cutting fluid overcomes the shortcomings of traditional water-soluble cutting fluids, such as easy deterioration, poor cleaning and transparency, and poor lubrication of fully synthetic cutting fluids, and is less likely to cause ceramic fiber chipping and edge collapse;

[0124] By depositing silicon carbide coating on ceramic workpieces, the boron material in the extreme pressure agent can seal the micro cracks in the thread, prevent the extension and diffusion of the surface cracks of the thread, and further improve the processing stability and precision of the ceramic workpiece.

[0125] From the above we know:

[0126] By using diamond tools to cut ceramic workpieces, the hardness of diamond tools is much higher than that of ceramic materials, which reduces cutting force and improves processing efficiency. Diamond tools have good wear resistance and can maintain a long service life when cutting hard and brittle ceramic materials, reducing the frequency of tool replacement. At the same time, less heat is generated during the cutting process, which helps to maintain the dimensional accuracy and surface quality of the workpiece.

[0127] Microemulsion cutting fluid can form a lubricating film on the workpiece, and has cleaning properties and transparency, which is conducive to observing the surface condition of the workpiece. Microemulsion cutting fluid overcomes the shortcomings of traditional cutting fluid that is easy to deteriorate, has poor cleaning properties and transparency, and poor lubrication of fully synthetic cutting fluid. It also has strong permeability, so that the microemulsion cutting fluid can fully infiltrate the wall of the threaded hole to be processed, forming a certain penetration emulsion layer, making it less likely for ceramic fiber debris to collapse, meeting the processing requirements of high hardness, high strength and hard and brittle materials, and ensuring the qualified rate of ceramic products.

[0128] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0129] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0130] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0131] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A ceramic thread position processing method, characterized in that: The processing method comprises the following steps: S1. Place the ceramic workpiece to be processed on the CNC machine table and fix it using the XYZ axis. S2, select a cutting tool and install it on the CNC tool holder, and align the cutting tool and the ceramic workpiece; S3, prepare micro-emulsified cutting fluid and fill it into the CNC fluid storage tank, and add a filter cover under the machine to separate the debris contained in the micro-emulsified cutting fluid; S4, adjusting the feed speed, tool speed and cutting amount of the cutting tool to the ceramic workpiece through the CNC, starting the CNC to make the cutting tool perform thread processing on the inner wall of the ceramic workpiece, and the configured micro-emulsified cutting fluid infiltrates the threaded hole wall; S5. Take the processed ceramic workpiece out of the machine and check whether its size and appearance meet the required standards; S6. Deposit silicon carbide coating on the ceramic workpiece, and then clean the ceramic workpiece and try to fit the NIHS thread gauge.

2. A ceramic thread position processing method according to claim 1, characterized in that: In S2, the cutting tool is a cemented carbide tool and a diamond tool.

3. A ceramic thread position processing method according to claim 1, characterized in that: In S3, the microemulsified cutting fluid is prepared by mixing the following raw materials in parts by weight: 5-10 parts of triethanolamine oleate, 5-10 parts of nonionic surfactant A, 3-8 parts of nonionic surfactant B, 15-20 parts of base oil, 10-20 parts of lubricating additive, 5-10 parts of extreme pressure agent, 5-15 parts of rust inhibitor, 0.5-2 parts of bactericide, 0.2-0.5 parts of defoaming agent and 30-50 parts of water.

4. A ceramic thread position processing method according to claim 3, characterized in that: The nonionic surfactant A is one or more of low-foaming nonionic PO-EO-PO type block copolymer or Nonidet SF-5; The nonionic surfactant B is one or more of alkylolamide, polyol monofatty acid ester or polyoxyethylene-polyoxypropylene copolymer; The base oil is a cycloparaffin base oil; The lubricating additive is ricinoleic acid polyester; The extreme pressure agent is an organic borate containing sulfur and nitrogen; The rust inhibitor is prepared by mixing triethanolamine and sebacic acid, and the mass ratio of triethanolamine to sebacic acid is 1:1; The bactericide is BK bactericide or MBM bactericide.

5. A ceramic thread position processing method according to claim 1, characterized in that: In S6, the process parameters for depositing the silicon carbide coating are: The deposition temperature is 950-1000° C., the deposition time is 30-35 hours, and the reaction gas introduced during the deposition of the silicon carbide coating is one of argon and hydrogen.

6. A ceramic thread position processing method according to claim 1, characterized in that: In S6, the NIHS thread go / no-go gauge steps are as follows: Align the through end of the thread gauge with the thread to be inspected, ensure that the axis of the thread gauge is aligned with the axis of the thread, align the stop end of the thread gauge with the thread to be inspected, turn the thread gauge, check whether the through end can easily pass through the entire thread length to determine whether the thread is large enough, check whether the stop end cannot be screwed in within 2 pitches to determine whether the thread is within the allowable minimum size range. If the through end passes through the thread freely and the stop end stops within 2 pitches, the thread size is qualified. If the through end cannot pass or the stop end exceeds 2 pitches, the thread size is unqualified.

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