Micro-lubrication dry ice inner-cooling grinding wheel and method thereof

Abstract

The application discloses a kind of trace lubrication dry ice inner-cooling grinding wheel and method thereof, including grinding wheel matrix, air inlet tank, quick connector, air hose, lubricating liquid pipe, grinding wheel disc assembly, the air inlet tank is rigidly welded with grinding wheel matrix, the air hose two ends are respectively connected with the quick connector on air inlet tank and grinding wheel matrix, the lubricating liquid pipe two ends are respectively connected with the quick connector on four liquid inlet and outlet on grinding wheel matrix, the grinding wheel matrix is connected with grinding wheel disc by thread;The application, through liquid CO2 pressure drop vaporization principle, dry ice is formed in grinding wheel matrix refrigeration cavity, dry ice absorbs grinding heat vaporization when processing, chamber pressure rises, vaporization CO2 gas flows out from grinding wheel disc hole downward, carries away heat of grinding area.In addition, through pressure atomization principle, lubricating liquid is pushed to grinding wheel disc conical air outlet cavity by pressure through micropore, and atomized liquid is sprayed to carry out trace lubrication to grinding area.The grinding force and grinding heat of grinding area are effectively reduced, and the grinding quality is improved.

Description

Technical Field

[0001] This invention relates to the field of precision grinding technology, specifically to a micro-lubricated dry ice internal cooling grinding wheel and its method. Background Technology

[0002] Grinding with grinding wheels, as a highly efficient and precise material removal method, is widely used in the machining of parts requiring high precision and surface quality, such as in machinery manufacturing, aerospace, automotive, and medical devices. During grinding, a large amount of grinding heat and enormous grinding force are generated in the grinding zone between the grinding wheel and the workpiece. If heat dissipation and lubrication are not timely provided, defects such as burns and cracks will occur on the workpiece surface, severely affecting the workpiece's machining quality. Traditional cooling and lubrication methods typically use grinding coolant; however, due to the airflow layer generated around the rotating grinding wheel, it is difficult for the grinding coolant to enter the grinding zone, thus hindering effective cooling and lubrication.

[0003] Currently, scholars both domestically and internationally have conducted extensive research on internally cooled grinding. Compared to externally cast cooling methods, internally cooled grinding features the characteristic of directly spraying coolant from inside the grinding wheel through coolant channels on the wheel body to the grinding zone. This effectively avoids the influence of the airflow layer generated around the rotating grinding wheel, thus significantly reducing grinding temperature and preventing or minimizing thermal damage to the workpiece surface. However, traditional internally cooled grinding wheels, such as those using only nanofluid coolant, rely more on single-function internal cooling and do not effectively combine it with internal lubrication. Although composite cooling and lubrication solutions have been developed, their overall effect is not as good as that of independent cooling and independent lubrication, and they also cause some environmental pollution. Furthermore, traditional internally cooled grinding wheels generally use internal casting cooling, resulting in a large amount of coolant flowing out and wasting it. In addition, traditional internally cooled grinding wheels cannot be directly circulated with low-temperature liquid nitrogen and low-temperature liquid CO2, as this easily causes the pipes to freeze, which also limits their use. Some researchers have also used built-in heat pipe structures for cooling and external casting lubrication, but they have not considered the role of internal lubrication. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a micro-lubricated dry ice-cooled grinding wheel and its method. During rotary machining, liquid CO2 is introduced into the grinding wheel. Utilizing the vaporization principle of liquid CO2 pressure drop, dry ice forms within the cooling chamber. The dry ice then absorbs grinding heat and accelerates vaporization, causing the pressure in the cooling chamber to rise. The vaporized CO2 gas flows downwards from the cooling vents on the grinding wheel, carrying away a significant amount of heat from the grinding zone. Simultaneously, high-pressure air is introduced into the grinding wheel using the pressure atomization principle. When the gas flows at high speed through the conical cavity vents, the pressure in the lubricating fluid chamber is greater than the pressure inside the conical cavity vents. Due to the pressure difference, the lubricating fluid is forced into the lubricating fluid micropores by atmospheric pressure and pushed into the conical cavity vents. Under the dispersion effect of the high-pressure air, the lubricating fluid is atomized and sprayed out from the conical cavity vents, lubricating the grinding zone. This effectively achieves micro-lubrication of the grinding zone, reducing grinding heat and grinding force during grinding, improving grinding quality, lowering production costs, and reducing environmental pollution.

[0005] Includes grinding wheel base, air inlet box, quick coupling, air hose, lubricant hose, and grinding wheel assembly;

[0006] The grinding wheel base and the air intake box are rigidly welded together.

[0007] The quick couplings are connected to the grinding wheel base and the air intake box by threads. There are a total of 22 quick couplings. Eighteen of them are installed in nine evenly distributed on the circumference of the air intake box and nine evenly distributed on the flat end face of the grinding wheel base near the lower end of the air intake box. The other four are installed in two symmetrically distributed on the circumference of the grinding wheel base near the upper end of the air intake box and in two symmetrically distributed on the lowest flat surface of the grinding wheel base.

[0008] There are nine air hoses in total, evenly distributed around the circumference of the grinding wheel base. One end of each air hose is connected to a quick connector on the air intake box, and the other end is connected to a quick connector on the grinding wheel base. They are evenly distributed around the circumference of the grinding wheel base.

[0009] The lubricating fluid pipe is divided into two symmetrical pipes. One end of the two lubricating fluid pipes is connected to a quick connector on the circumferential surface of the grinding wheel base near the upper end of the air intake box, and the other end is connected to a quick connector on the lowest plane of the grinding wheel base.

[0010] The grinding wheel assembly includes a grinding wheel, fastening bolts, an inner sealing ring, and an outer sealing ring; the grinding wheel is connected to the grinding wheel base by fastening bolts, and the inner and outer sealing rings are respectively installed in two inner and outer sealing grooves on the grinding wheel base;

[0011] The grinding wheel base is equipped with a liquid CO2 inlet channel, an air inlet channel, a liquid inlet channel, a cooling chamber, a conical air channel, a lubricating fluid chamber, lubricating fluid micropores, and an outlet channel. The liquid CO2 inlet channel is directly connected to the cooling chamber. The air inlet channel is a set of double-hole channels, which are connected to the air inlet box and then connected to the conical air channel on the grinding wheel base through the air hose on the air inlet box. The liquid inlet channel is connected to the lubricating fluid chamber through the lubricating fluid pipe on the side of the channel, and the outlet channel is connected to the lubricating fluid chamber through the lubricating fluid pipe on the side of the channel. This constitutes the circulation of lubricating fluid inside the grinding wheel base. The inner wall of the lubricating fluid chamber is provided with nine evenly distributed circumferential lubricating fluid micropores. When lubricating fluid is introduced into the lubricating fluid chamber at normal pressure, no lubricating fluid overflows.

[0012] The grinding wheel has nine evenly distributed conical air holes on its circumferential surface. The upper end of the conical air holes is connected to the conical air flow channel on the grinding wheel base, and one side is connected to the lubricating fluid chamber on the grinding wheel base through the lubricating fluid micropores on the grinding wheel base. The grinding wheel also has through cooling air holes.

[0013] The upper and lower circumferential surfaces of the grinding wheel are equipped with laser-engraved annular microchannels. The annular microchannels are opened around the cooling vents and conical cavity vents on the grinding wheel to facilitate the diffusion of lubricant and CO2 gas through the annular microchannels.

[0014] A method for micro-lubrication and cooling of a dry ice-cooled grinding wheel includes the following steps:

[0015] (1) The micro-lubricated dry ice internal cooling grinding wheel is clamped and mounted on the machine tool spindle using a standard tool holder;

[0016] (2) Use a liquid CO2 gas tank to connect to a controllable one-way valve and then connect to the liquid CO2 inlet channel of the micro-lubricated dry ice internal cooling grinding wheel;

[0017] (3) High-pressure air intake is directly taken from the gas used in the machining center and connected to the air intake channel of the micro-lubricated dry ice internal cooling grinding wheel;

[0018] (4) The lubricating fluid is pumped through an external pumping system connected to the inlet and outlet channels of the micro-lubricating dry ice internal cooling grinding wheel, and is pumped in a low-pressure circulation manner.

[0019] (5) During the dry ice-cooled grinding wheel rotation process, liquid CO2 is introduced directly into the cooling chamber of the grinding wheel base. Due to the pressure reduction, the liquid CO2 rapidly vaporizes and absorbs heat to form dry ice in the cooling chamber. As the grinding continues, a large amount of heat is generated, causing the dry ice in the cooling chamber to absorb heat and vaporize more rapidly, and then the chamber pressure increases. The vaporized CO2 gas flows out from the cooling vents on the grinding wheel, carrying away a large amount of heat from the grinding area. At the same time, lubricating fluid is introduced from the inlet channel, enters the lubricating fluid chamber on the grinding wheel base through the lubricating fluid pipe on the left, and then flows out from the lubricating fluid pipe on the right, circulating and being pumped at low pressure. Furthermore, high-pressure gas enters through the inlet channel. The air enters the conical airflow channel via an air hose. After being pressurized, the high-pressure air enters the conical airflow channel and then enters the conical cavity air hole on the grinding wheel. At this time, due to the flow of high-pressure air, the pressure in the conical cavity air hole drops instantly. The pressure in the lubricating fluid chamber is greater than the pressure in the conical cavity air hole. Therefore, the lubricating fluid in the lubricating fluid chamber is pushed into the conical cavity air hole by pressure through the lubricating fluid micropores. Under the dispersion action of high-pressure air, the lubricating fluid is atomized and sprayed out from the conical cavity air hole to lubricate the grinding zone. The vaporized CO2 and atomized lubricating fluid are effectively diffused in the grinding zone under the action of the annular microflow channel on the grinding wheel, realizing effective internal cooling and internal lubrication of the grinding zone.

[0020] (6) During processing, the external automatic control system can control and adjust the delivery of liquid CO2 according to the specific working conditions, control the opening of the gas valve, and the duration of intermittent opening and closing, to ensure that the dry ice in the refrigeration chamber can be continuously generated and consumed during processing, maintaining effective and stable refrigeration. At the same time, the pressure of the inlet air and the duration of intermittent opening and closing can be controlled and adjusted to ensure effective atomization and effective lubrication of the lubricating fluid.

[0021] Compared with existing technologies, the technical advantages of this invention are: during grinding, the grinding wheel can achieve effective and stable internal cooling with dry ice and micro-lubrication. During processing, liquid CO2 is introduced into the grinding wheel. Utilizing the vaporization principle of liquid CO2 pressure drop, dry ice is formed in the cooling chamber. The dry ice then absorbs grinding heat and accelerates vaporization, causing the pressure in the cooling chamber to rise. After vaporization, the CO2 gas flows downwards from the cooling vents on the grinding wheel, carrying away a large amount of heat from the grinding zone. Simultaneously, high-pressure air is introduced into the grinding wheel using the pressure atomization principle. When the gas flows at high speed through the conical cavity vents, the pressure in the lubricating fluid chamber is greater than the pressure inside the conical cavity vents. Due to the pressure difference, the lubricating fluid is forced into the lubricating fluid micropores by atmospheric pressure and pushed into the conical cavity vents. Under the dispersion effect of the high-pressure air, the lubricating fluid is atomized and sprayed out from the conical cavity vents, providing micro-lubrication to the grinding zone. This effectively reduces grinding heat and grinding force during grinding, improves grinding quality, reduces production costs, and reduces environmental pollution. The present invention also features a simple structure, easy assembly and disassembly, and low manufacturing cost. Attached Figure Description

[0022] Figure 1 This is an isometric view according to an embodiment of the present invention;

[0023] Figure 2 This is a left sectional view according to an embodiment of the present invention;

[0024] Figure 3 This is a right sectional view according to an embodiment of the present invention;

[0025] Figure 4 This is a view of the grinding wheel according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the micro-lubricated dry ice refrigeration principle according to an embodiment of the present invention; Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention includes a grinding wheel base (1), an air inlet box (2), an air hose (4), a lubricating fluid pipe (5), a quick connector (3), and a grinding wheel assembly (6);

[0029] The grinding wheel base (1) and the air intake box (2) are rigidly welded together;

[0030] The quick connectors (3) are connected to the grinding wheel base (1) and the air inlet box (2) respectively by threads. There are a total of twenty-two quick connectors (3), of which eighteen are evenly distributed on the circumference of the air inlet box (2) and nine are evenly distributed on the flat end face of the grinding wheel base (1) near the lower end of the air inlet box (2). The other four are evenly distributed on the circumference of the grinding wheel base (1) near the upper end of the air inlet box (2) and the other two are evenly distributed on the bottom plane of the grinding wheel base (1).

[0031] There are nine air hoses (4) in total, which are evenly distributed on the circumference of the grinding wheel base (1). One end of each air hose (4) is connected to the quick connector (3) on the air inlet box (2) and the other end is connected to the quick connector (3) on the grinding wheel base (1). They are evenly distributed on the circumference of the grinding wheel base (1).

[0032] The lubricating fluid pipe (5) is divided into two symmetrical pipes. One end of the two lubricating fluid pipes (5) is connected to the quick connector (3) on the circumferential surface of the grinding wheel base (1) near the upper end of the air intake box (2), and the other end is connected to the quick connector (3) on the lowest plane of the grinding wheel base (1).

[0033] The grinding wheel assembly (6) includes a grinding wheel (61), fastening bolts (62), an inner sealing ring (63), and an outer sealing ring (64); the grinding wheel (61) is connected to the grinding wheel base (1) by fastening bolts (62), and the inner sealing ring (63) and the outer sealing ring (64) are respectively installed in two inner and outer sealing grooves on the grinding wheel base (1);

[0034] The grinding wheel base (1) is provided with a liquid CO2 inlet channel (111), an air inlet channel (112), a liquid inlet channel (113), a cooling chamber (114), a conical air inlet channel (115), a lubricating fluid chamber (116), lubricating fluid micropores (117), and a liquid outlet channel (118). The liquid CO2 inlet channel (111) is directly connected to the cooling chamber (114). The air inlet channel (112) is a set of double-hole channels. The air inlet channel (112) is connected to the air inlet box (2), and then connected to the grinding wheel base through the air hose (4) on the air inlet box (2). The conical airflow channels (115) on the body (1) are connected, the liquid inlet channel (113) is connected to the lubricating fluid chamber (116) through the lubricating fluid pipe (5) on the side of the channel, and the liquid outlet channel (118) is connected to the lubricating fluid chamber (116) through the lubricating fluid pipe (5) on the side of the channel. In this way, the lubricating fluid circulates inside the grinding wheel base (1). The inner wall of the lubricating fluid chamber (116) is provided with nine evenly distributed circumferential lubricating fluid micro-holes (117). When the lubricating fluid is introduced into the lubricating fluid chamber (116) at normal pressure, no lubricating fluid overflows.

[0035] like Figure 3 and Figure 4As shown, the grinding wheel disk (61) has nine evenly distributed conical air holes (611) on its circumferential surface. The upper end of the conical air holes (611) is connected to the conical air flow channel (115) on the grinding wheel base (1), and one side is connected to the lubricating fluid chamber (116) on the grinding wheel base (1) through the lubricating fluid micro-hole (117) on the grinding wheel base (1). The grinding wheel disk (61) is also provided with a through cooling air hole (612).

[0036] The upper and lower circumferential surfaces of the grinding wheel (61) are provided with laser-engraved annular microchannels (613). The annular microchannels (613) are opened around the cooling air holes (612) and the conical cavity air holes (611) on the grinding wheel (61), which facilitates the diffusion of lubricating fluid and CO2 gas through the annular microchannels (613).

[0037] like Figure 1 , Figure 2 and Figure 5 As shown, Figure 5 This is a schematic diagram of the micro-lubricated dry ice refrigeration principle according to an embodiment of the present invention. The method principle and operation steps are implemented as follows:

[0038] (1) The micro-lubricated dry ice internal cooling grinding wheel is clamped and mounted on the machine tool spindle using a standard tool holder;

[0039] (2) Use a liquid CO2 gas tank to connect to a controllable one-way valve and then connect to the liquid CO2 inlet channel of the micro-lubricated dry ice internal cooling grinding wheel (111);

[0040] (3) High-pressure air intake is directly taken from the machining center and connected to the air intake channel of the micro-lubricated dry ice internal cooling grinding wheel (112);

[0041] (4) The lubricating fluid is pumped through an external pumping system connected to the inlet channel (113) and outlet channel (118) of the micro-lubricating dry ice internal cooling grinding wheel, and is pumped in a low-pressure circulation manner.

[0042] (5) During the dry ice cooling grinding wheel rotation process, liquid CO2 is introduced directly into the cooling chamber (114) of the grinding wheel base (1). Due to the pressure reduction, the liquid CO2 rapidly vaporizes and absorbs heat to form dry ice in the cooling chamber (114). As the processing continues, grinding generates a large amount of heat, which causes the dry ice in the cooling chamber (114) to absorb heat and vaporize more rapidly, and then the chamber pressure increases. The vaporized CO2 gas flows out from the cooling air hole (612) on the grinding wheel disc (61), carrying away a large amount of heat from the grinding area. At the same time, the lubricating fluid is introduced from the inlet channel (113), enters the lubricating fluid chamber (116) on the grinding wheel base (1) through the lubricating fluid pipe (5) on the left, and then flows out from the lubricating fluid pipe (5) on the right into the outlet channel (118) for circulation and low-pressure pumping. Furthermore, high-pressure gas enters the air inlet box (2) through the air inlet channel (112). Then, the air enters the conical airflow channel (115) through the air hose (4). After the high-pressure air enters the conical airflow channel (115) and is pressurized, it enters the conical cavity air hole (611) on the grinding wheel (61). At this time, due to the high-pressure air flowing through, the pressure in the conical cavity air hole (611) drops instantly. The pressure in the lubricating fluid chamber (116) is greater than the pressure in the conical cavity air hole (611). Therefore, the lubricating fluid in the lubricating fluid chamber (116) is pushed into the conical cavity air hole (611) by pressure through the lubricating fluid micro-hole (117). Under the dispersion action of the high-pressure air, the lubricating fluid is atomized. The atomized lubricating fluid is sprayed out from the conical cavity air hole (611) to lubricate the grinding area. The vaporized CO2 and the atomized lubricating fluid are effectively diffused in the grinding area under the action of the annular micro-channel (613) on the grinding wheel (61), realizing effective internal cooling and internal lubrication of the grinding area.

[0043] (6) The method also includes that, during processing, the external automatic control system can control and adjust the opening degree of the liquid CO2 delivery control valve, as well as the duration of intermittent opening and closing, according to the specific working conditions, to ensure that the dry ice in the refrigeration chamber (114) can be continuously generated and consumed during processing, maintaining effective and stable refrigeration. At the same time, the pressure of the inlet air and the duration of intermittent opening and closing are controlled and adjusted to ensure effective atomization and effective lubrication of the lubricating fluid.

[0044] In this invention, the distribution and number of air hoses (4) and the corresponding number of conical air channels (115) and conical cavity vents (611) can be increased or decreased according to requirements and processing effects.

[0045] In this invention, the size, shape and distribution of the cooling vents (612) on the grinding wheel (6) can be designed and transformed in combination with heat dissipation simulation, and the annular microchannels (613) on the grinding wheel can also be designed and transformed.

[0046] Although embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the specific embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the drawings should be construed as limiting the scope of the claims.

Claims

1. A micro-lubricated dry ice internally cooled grinding wheel, characterized in that, include: Grinding wheel base (1); air inlet box (2), rigidly welded to the grinding wheel base (1); The quick connector (3) is connected to the grinding wheel base (1) and the air inlet box (2) by threads and is installed evenly. Air hoses (4) are evenly distributed on the circumference of the grinding wheel base (1), one end of which is connected to the quick connector (3) on the air inlet box (2) and the other end of which is connected to the quick connector (3) on the grinding wheel base (1). The lubricating fluid pipe (5) is divided into two symmetrical pipes, and the two ends of the pipes are respectively connected to the quick connector (3) on the grinding wheel base (1); The grinding wheel base (1) is provided with a liquid CO2 inlet channel (111), an air inlet channel (112), a liquid inlet channel (113), a cooling chamber (114), a conical air inlet channel (115), a lubricating fluid chamber (116), lubricating fluid micropores (117), and an outlet channel (118); the liquid CO2 inlet channel (111) is directly connected to the cooling chamber (114); the air inlet channel (112) is a set of double-hole channels, and the air inlet channel (112) is connected to the air inlet box (2). The air inlet (2) is connected to the air hose (4) on the air inlet box (2) and the conical air flow channel (115) on the grinding wheel base (1). The liquid inlet channel (113) is connected to the lubricating fluid chamber (116) through the lubricating fluid pipe (5) on the side of the channel. The liquid outlet channel (118) is connected to the lubricating fluid chamber (116) through the lubricating fluid pipe (5) on the side of the channel. The inner wall of the lubricating fluid chamber (116) is provided with evenly distributed lubricating fluid micropores (117). The grinding wheel assembly (6) includes a grinding wheel (61) and a fastening bolt (62). The grinding wheel (61) is connected to the grinding wheel base (1) by the fastening bolt (62). The surface of the grinding wheel (61) is provided with evenly distributed conical cavity air holes (611). The conical cavity air holes (611) are connected to the conical air flow channel (115) on the grinding wheel base (1). One side is connected to the lubricating fluid chamber (116) on the grinding wheel base (1) through the lubricating fluid micropore (117) on the grinding wheel base (1). The grinding wheel (61) is also provided with a through cooling air hole (612).

2. The micro-lubricated dry ice internal cooling grinding wheel according to claim 1, characterized in that: The grinding wheel assembly (6) also includes an inner sealing ring (63) and an outer sealing ring (64), which are respectively installed in two inner and outer sealing grooves on the grinding wheel base (1).

3. The micro-lubricated dry ice internal cooling grinding wheel according to claim 1, characterized in that: The surface of the grinding wheel (61) is provided with a laser-engraved annular microchannel (613), which is opened around the cooling air hole (612) and the conical cavity air hole (611) on the grinding wheel (61).

4. A method for micro-lubrication and cooling of a dry ice-cooled grinding wheel with micro-lubrication, comprising the dry ice-cooled grinding wheel as described in any one of claims 1-3, characterized in that, Includes the following steps: (1) The micro-lubricated dry ice internal cooling grinding wheel is clamped and installed on the machine tool spindle using a standard tool holder; (2) A liquid CO2 gas tank is connected to a controllable one-way valve and then connected to the liquid CO2 inlet channel (111) of the micro-lubricated dry ice internal cooling grinding wheel. (3) The high-pressure air intake is directly taken from the gas used in the machining center and connected to the air intake channel (112) of the micro-lubricated dry ice internal cooling grinding wheel. (4) The lubricating fluid is pumped through an external pumping system connected to the inlet channel (113) and outlet channel (118) of the micro-lubricating dry ice internal cooling grinding wheel, and pumped in a low-pressure circulation manner. (5) During the dry ice-cooled grinding wheel rotation, liquid CO2 is introduced directly into the cooling chamber (114) of the grinding wheel base (1). Due to the pressure reduction, the liquid CO2 rapidly vaporizes and absorbs heat to form dry ice in the cooling chamber (114). As the grinding continues, a large amount of heat is generated, causing the dry ice in the cooling chamber (114) to absorb heat and vaporize more rapidly, and then the chamber pressure increases. The vaporized CO2 gas flows out from the cooling air hole (612) on the grinding wheel disc (61), carrying away a large amount of heat from the grinding area. At the same time, the lubricating fluid is introduced from the inlet channel (113), enters the lubricating fluid chamber (116) on the grinding wheel base (1) through the lubricating fluid pipe (5) on the left, and then flows out from the lubricating fluid pipe (5) on the right into the outlet channel (118) for circulation and low-pressure pumping. Furthermore, high-pressure gas enters the air inlet box (2) through the air inlet channel (112). Then, the air enters the conical airflow channel (115) through the air hose (4). After the high-pressure air enters the conical airflow channel (115) and is pressurized, it enters the conical cavity air hole (611) on the grinding wheel (61). At this time, due to the high-pressure air flowing through, the pressure in the conical cavity air hole (611) drops instantly. The pressure in the lubricating fluid chamber (116) is greater than the pressure in the conical cavity air hole (611). Therefore, the lubricating fluid in the lubricating fluid chamber (116) is pushed into the conical cavity air hole (611) by pressure through the lubricating fluid micropore (117). Under the dispersion action of the high-pressure air, the lubricating fluid is atomized. The atomized lubricating fluid is sprayed out from the conical cavity air hole (611) to lubricate the grinding area. The vaporized CO2 and the atomized lubricating fluid are effectively diffused in the grinding area under the action of the annular microchannel (613) on the grinding wheel (61), realizing effective internal cooling and internal lubrication of the grinding area.

5. The method according to claim 4, characterized in that: The method also includes the ability to control the opening degree of the liquid CO2 delivery control valve and the duration of intermittent opening and closing during processing through an external automatic control system according to specific working conditions, so as to ensure that the dry ice in the refrigeration chamber (114) can be continuously generated and consumed during processing, maintaining effective and stable refrigeration. At the same time, the pressure of the air intake and the duration of intermittent opening and closing are controlled and adjusted to ensure effective atomization and effective lubrication of the lubricating fluid.

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