Minimum lubrication dry ice internal cooling grinding wheel and method thereof

Abstract

The invention discloses a minimal quantity lubrication dry ice inner cooling grinding wheel and a method thereof.The minimal quantity lubrication dry ice inner cooling grinding wheel comprises a grinding wheel base body, an air inlet box, quick connectors, an air hose, a lubricating liquid pipe and a grinding wheel disc assembly, the air inlet box is rigidly welded to the grinding wheel base body, and the two ends of the air hose are connected with the quick connectors on the air inlet box and the grinding wheel base body respectively; the two ends of the lubricating liquid pipe are connected with the quick connectors on the four liquid inlets and outlets in the grinding wheel base body respectively, and the grinding wheel base body is connected with the grinding wheel disc through threads. According to the liquid CO2 pressure drop vaporization principle, dry ice is formed in the grinding wheel base body refrigeration cavity, during machining, the dry ice absorbs grinding heat to be vaporized, the pressure of the cavity is increased, vaporized CO2 gas downwards flows out of a grinding wheel disc hole, and heat of a grinding area is taken away. In addition, according to the pressure atomization principle, the lubricating liquid is pushed into the conical air outlet cavity of the grinding wheel disc by pressure through the micropores and sprayed out to form atomized liquid, and the grinding area is subjected to minimal quantity lubrication. The grinding force and the grinding heat of a grinding area are effectively reduced, and the grinding quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of precision grinding, in particular to a minimal lubrication dry ice internal cooling grinding wheel and a method thereof. Background Art

[0002] As an efficient and high-precision material removal method, grinding wheel grinding is widely used in parts processing fields with high precision and high surface quality requirements such as mechanical manufacturing, aerospace, automobiles, and medical equipment. During the grinding process, a large amount of grinding heat and huge grinding force will be generated in the grinding area between the grinding wheel and the workpiece. If the heat is not dissipated and lubricated in time, burns, cracks and other undesirable phenomena will occur on the surface of the workpiece, seriously affecting the processing quality of the workpiece. Traditional cooling and lubrication methods generally use grinding coolant for cooling and lubrication, but due to the air flow layer generated by the rotation around the grinding wheel, it is difficult for the grinding coolant to enter the grinding area, so effective cooling and lubrication cannot be performed.

[0003] At present, scholars at home and abroad have conducted a lot of research on internal cooling grinding. Compared with the external pouring cooling method, the internal cooling grinding method has the characteristics of directly spraying the coolant from the inside of the grinding wheel through the coolant flow channel opened on the body to the grinding area, which can effectively avoid the influence of the airflow layer generated by the rotation around the grinding wheel, thereby significantly reducing the grinding temperature and preventing or reducing the thermal damage of the workpiece surface. However, the traditional internal cooling grinding wheel, such as the introduction of nanofluid coolant alone, is more based on single internal cooling, and does not effectively combine the effect of internal lubrication. Although there is a development of cooling and lubrication composite solutions, its comprehensive effect is not very good compared with the independent cooling and independent lubrication effects, and there is a certain pollution to the environment. In addition, traditional internal cooling grinding wheels generally use internal pouring cooling, and a large amount of coolant flows out, causing waste. In addition, traditional internal cooling grinding wheels cannot directly pass low-temperature liquid nitrogen and low-temperature liquid CO2, which can easily cause pipe freezing, which also limits its use. Some researchers also use built-in heat pipe structures for cooling and cooling, and use external pouring lubrication, but do not consider the role of internal lubrication. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a micro-lubrication dry ice internal cooling grinding wheel and a method thereof. During the rotation process, liquid CO2 is introduced into the grinding wheel, and the liquid CO2 pressure drop vaporization principle is used to form dry ice in the refrigeration chamber. Then, the dry ice absorbs the grinding heat and accelerates vaporization, causing the pressure in the refrigeration chamber to increase. After vaporization, the CO2 gas flows downward from the cooling air holes on the grinding wheel disc, taking away a large amount of heat in the grinding area. At the same time, high-pressure air is introduced into the grinding wheel by the pressure atomization principle. When the gas flows through the conical cavity air hole at a high speed, the pressure of the lubricating liquid chamber is greater than the pressure in the conical cavity air hole. Due to the pressure difference, the lubricating liquid is squeezed into the lubricating liquid micropore by the atmospheric pressure and pushed into the conical cavity air hole. Under the discrete action of the high-pressure air, the lubricating liquid is atomized, and the atomized lubricating liquid is ejected from the conical cavity air hole to lubricate the grinding area. The micro-lubrication of the grinding area is effectively achieved, the grinding heat and grinding force during the grinding process are reduced, the grinding quality is improved, and the production cost is reduced and the environmental pollution is reduced.

[0005] It includes a grinding wheel base, an air intake box, a quick connector, an air hose, a lubricating liquid pipe, and a grinding wheel disc assembly;

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

[0007] The quick connectors are connected to the grinding wheel base and the air intake box through threads, and there are 22 quick connectors in total, of which 18 are evenly installed on the circumference of the air intake box, and 9 are evenly installed on the flat end surface of the grinding wheel base near the lower end of the air intake box. The other four are evenly installed on the circumference of the grinding wheel base near the upper end of the air intake box, and two are evenly installed on the lowermost plane of the grinding wheel base.

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

[0009] The lubricating liquid pipe is divided into two symmetrical pipes, one end of the two lubricating liquid pipes is connected to the quick connector on the circumferential surface of the grinding wheel base body near the upper end of the air intake box, and the other end is connected to the quick connector on the lowermost plane of the grinding wheel base body;

[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 through the fastening bolts, and the inner sealing ring and the outer sealing ring are respectively installed in two inner and outer sealing grooves on the grinding wheel base;

[0011] The grinding wheel base is provided with a liquid CO2 inlet flow channel, an air inlet flow channel, a liquid inlet flow channel, a refrigeration chamber, a conical air flow channel, a lubricating liquid chamber, lubricating liquid micropores, and a liquid outlet flow channel; the liquid CO2 inlet flow channel is directly connected to the refrigeration chamber; the inlet flow channel is a set of double-hole flow channels, the inlet flow channel is connected to the air inlet box, and then connected to the conical air flow channel on the grinding wheel base through the air hose on the air inlet box, the liquid inlet flow channel is connected to the lubricating liquid chamber through the lubricating liquid pipe on the side of the flow channel, and the liquid outlet flow channel is connected to the lubricating liquid chamber through the lubricating liquid pipe on the side of the flow channel, so that the lubricating liquid circulates inside the grinding wheel base, and the inner wall of the lubricating liquid chamber is provided with nine circumferential lubricating liquid micropores evenly distributed, and when the lubricating liquid is passed into the normal pressure lubricating liquid chamber, no lubricating liquid overflows from the lubricating liquid micropores;

[0012] The upper circumferential surface of the grinding wheel disc is provided with nine evenly distributed conical cavity air holes, the upper ends of the conical cavity air holes are connected to the conical air flow channel on the grinding wheel base, and one side is connected to the lubricating liquid chamber on the grinding wheel base through the lubricating liquid micropores on the grinding wheel base. The grinding wheel disc is also provided with through cooling air holes;

[0013] The upper and lower circumferential surfaces of the grinding wheel are provided with laser-engraved annular microchannels, which are opened around the cooling air holes and conical cavity air holes on the grinding wheel to facilitate the diffusion of lubricating liquid and CO2 gas through the annular microchannels;

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

[0015] (1) The minimally lubricated dry ice internally cooled grinding wheel is clamped and installed on the machine tool spindle using a standard tool holder;

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

[0017] (3) The high-pressure air intake is directly taken from the gas used in the machining center and connected to the air intake channel of the minimally lubricated dry ice internally cooled grinding wheel;

[0018] (4) The lubricating liquid is pumped through an external pumping system to the inlet and outlet channels of the minimally lubricated dry ice internally cooled grinding wheel, and circulated at low pressure;

[0019] (5) When the dry ice cooled grinding wheel is rotated, liquid CO2 is introduced directly into the refrigeration chamber of the grinding wheel base. Due to the pressure reduction, the liquid CO2 quickly vaporizes and absorbs heat to form dry ice in the refrigeration chamber. As the processing continues, a large amount of heat is generated by grinding, which accelerates the absorption of heat and vaporization of the dry ice in the refrigeration chamber, and then the chamber pressure increases. The vaporized CO2 gas flows out from the cooling holes on the grinding wheel disc, taking away a large amount of heat from the grinding area. At the same time, the lubricating fluid is introduced from the liquid inlet channel, enters the lubricating fluid chamber on the grinding wheel base through the lubricating fluid pipe on the left, and then enters the liquid outlet channel from the lubricating fluid pipe on the right to flow out, and circulates low-pressure pumping. Furthermore, the high-pressure gas enters through the inlet channel The air enters the air intake box and then enters the conical air flow channel through the air hose. After the high-pressure air enters the conical air flow channel and is pressurized, it 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, and the pressure of 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 through the lubricating fluid micropores by pressure. Under the discrete action of the high-pressure air, the lubricating fluid is atomized, and the atomized lubricating fluid is ejected from the conical cavity air hole 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 on the grinding wheel, thereby realizing effective internal cooling and internal lubrication of the grinding area.

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

[0021] Compared with the prior art, the technical effect of the present invention is that when the grinding wheel is rotating and grinding, the grinding wheel can achieve effective and stable dry ice internal cooling and micro-internal lubrication. During processing, liquid CO2 is introduced into the grinding wheel, and the liquid CO2 pressure drop vaporization principle is used to form dry ice in the refrigeration chamber. Then the dry ice absorbs the grinding heat and accelerates vaporization, causing the pressure in the refrigeration chamber to increase. After vaporization, the CO2 gas flows downward from the cooling air holes on the grinding wheel disc, taking away a large amount of heat in the grinding area. At the same time, the principle of pressure atomization is used to introduce high-pressure air into the grinding wheel. When the gas flows through the conical cavity air hole at a high speed, the pressure of the lubricating liquid chamber is greater than the pressure in the conical cavity air hole. Due to the pressure difference, the lubricating liquid is squeezed into the lubricating liquid micropore by atmospheric pressure and pushed into the conical cavity air hole. Under the discrete action of high-pressure air, the lubricating liquid is atomized, and the atomized lubricating liquid is ejected from the conical cavity air hole to perform micro-lubrication on the grinding area. The grinding heat and grinding force during grinding processing are effectively reduced, the grinding quality is improved, and the production cost is reduced, and environmental pollution is reduced. The invention also has the characteristics of simple structure, easy assembly and disassembly and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0026] Figure 5 is a schematic diagram of a minimal lubrication dry ice refrigeration according to an embodiment of the present invention; DETAILED DESCRIPTION

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

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

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

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

[0031] The air hose (4) has nine pipes uniformly distributed on the circumference of the grinding wheel base (1), one end of each air hose (4) is connected to a quick connector (3) on the air inlet box (2), and the other end is connected to a quick connector (3) on the grinding wheel base (1), and the air hoses (4) are uniformly distributed on the circumference of the grinding wheel base (1);

[0032] The lubricating liquid pipe (5) is divided into two symmetrical pipes, one end of the two lubricating liquid pipes (5) is connected to a quick connector (3) on the circumferential surface of the grinding wheel base (1) near the upper end of the air inlet box (2), and the other end is connected to the quick connector (3) on the lowermost plane of the grinding wheel base (1);

[0033] The grinding wheel assembly (6) comprises a grinding wheel (61), a fastening bolt (62), an inner sealing ring (63), and an outer sealing ring (64); the grinding wheel (61) is connected to the grinding wheel base (1) via the fastening bolt (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] A grinding wheel base (1) is provided with a liquid CO2 inlet channel (111), an air inlet channel (112), a liquid inlet channel (113), a refrigeration chamber (114), a conical air channel (115), a lubricating liquid chamber (116), lubricating liquid micropores (117), and a liquid outlet channel (118); the liquid CO2 inlet channel (111) is directly connected to the refrigeration 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 an air hose (4) on the air inlet box (2). The conical air flow channel (115) on the body (1) is connected, the liquid inlet flow channel (113) is connected to the lubricating liquid chamber (116) through the lubricating liquid pipe (5) on the side of the flow channel, and the liquid outlet flow channel (118) is connected to the lubricating liquid chamber (116) through the lubricating liquid pipe (5) on the side of the flow channel, so that the lubricating liquid circulates inside the grinding wheel base (1), and the inner wall of the lubricating liquid chamber (116) is provided with nine circumferential lubricating liquid micropores (117) evenly distributed, and when the lubricating liquid is passed into the normal pressure lubricating liquid chamber (116), no lubricating liquid overflows from the lubricating liquid micropores (117);

[0035] like Figure 3 and Figure 4As shown, nine evenly distributed conical cavity air holes (611) are provided on the circumferential surface of the grinding wheel disc (61), the upper end of the conical cavity air hole (611) is communicated with the conical air flow channel (115) on the grinding wheel base (1), and one side is connected to the lubricating liquid chamber (116) on the grinding wheel base (1) through the lubricating liquid micropore (117) on the grinding wheel base (1), and the grinding wheel disc (61) is also provided with a through cooling air hole (612);

[0036] The upper and lower circumferential surfaces of the grinding wheel disc (61) are provided with annular microchannels (613) engraved by laser, and the annular microchannels (613) are opened around the cooling air holes (612) and the conical cavity air holes (611) on the grinding wheel disc (61), so as to facilitate the diffusion of lubricating liquid 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-lubrication dry ice refrigeration principle of an embodiment of the present invention, and the method principle steps and operations are implemented as follows:

[0038] (1) The minimally lubricated dry ice internally cooled grinding wheel is clamped and installed on the machine tool spindle using a standard tool holder;

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

[0040] (3) The high-pressure air intake is directly taken from the machining center and connected to the inlet flow channel (112) of the minimally lubricated dry ice internally cooled grinding wheel;

[0041] (4) The lubricating liquid is pumped through an external pumping system to the inlet flow channel (113) and the outlet flow channel (118) of the minimal lubrication dry ice internal cooling grinding wheel, and circulated low-pressure pumping;

[0042] (5) When the grinding wheel is rotated and processed in a dry ice-cooled environment, liquid CO2 is introduced directly into the refrigeration chamber (114) of the grinding wheel base (1). Due to the pressure reduction, the liquid CO2 is rapidly vaporized and absorbs heat to form dry ice in the refrigeration chamber (114). As the processing continues, a large amount of heat is generated by grinding, which accelerates the absorption of heat and vaporization of the dry ice in the refrigeration chamber (114), and then the chamber pressure increases. The vaporized CO2 gas flows out from the cooling air holes (612) on the grinding wheel disc (61), taking away a large amount of heat from the grinding area. At the same time, the lubricating fluid is introduced from the liquid 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 enters the liquid outlet channel (118) from the lubricating fluid pipe (5) on the right to flow out, and is circulated and pumped at low pressure. Furthermore, the high-pressure gas enters the air intake box (2) through the inlet channel (112). , and then enters the conical air flow channel (115) through the air hose (4). After the high-pressure air enters the conical air flow channel (115) and is pressurized, it enters the conical cavity air hole (611) on the grinding wheel (61). At this time, due to the flow of high-pressure air, the pressure in the conical cavity air hole (611) drops instantly, and the pressure in the lubricating liquid chamber (116) is greater than the pressure in the conical cavity air hole (611). Therefore, the lubricating liquid in the lubricating liquid chamber (116) is pushed into the conical cavity air hole (611) by pressure through the lubricating liquid micropore (117). Under the discrete action of the high-pressure air, the lubricating liquid is atomized, and the atomized lubricating liquid is ejected from the conical cavity air hole (611) to lubricate the grinding area. The vaporized CO2 and the atomized lubricating liquid are effectively diffused in the grinding area under the action of the annular microchannel (613) on the grinding wheel (61), thereby achieving effective internal cooling and internal lubrication of the grinding area.

[0043] (6) The method also includes that during processing, the delivery of liquid CO2 can be controlled by an external automatic control system according to specific working conditions, and the opening degree of the gas valve, as well as the intermittent opening and closing and the duration of the intermittent opening and closing can be controlled to ensure that the dry ice in the refrigeration chamber (114) can be continuously generated and consumed during processing to maintain effective and stable refrigeration, while synchronously controlling and adjusting the pressure of the intake air and the intermittent opening and closing and the duration of the intermittent opening and closing to ensure effective atomization and effective lubrication of the lubricating fluid.

[0044] The distribution and quantity of the air hoses (4) and the corresponding quantities of the tapered air channels (115) and tapered cavity air holes (611) in the present invention can be increased or decreased according to requirements and processing effects.

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

[0046] Although embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that the present invention is not limited to the details of the specific embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in a claim should not be regarded as limiting the claim involved.

Claims

1. A minimally lubricated dry ice internally cooled grinding wheel, characterized in that: include: A grinding wheel base (1); an air intake 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 intake box (2) through threads and is evenly installed; An air hose (4) is 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 liquid pipe (5) is divided into two symmetrical pipes, and both ends of the pipes are respectively connected to the quick connectors (3) on the grinding wheel base (1); The grinding wheel assembly (6) comprises a grinding wheel (61) and a fastening bolt (62), wherein the grinding wheel (61) is connected to the grinding wheel base (1) via the fastening bolt (62).

2. The minimal lubrication dry ice internal cooling grinding wheel according to claim 1, characterized in that: The grinding wheel assembly (6) further comprises an inner sealing ring (63) and an outer sealing ring (64), wherein 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).

3. The minimal lubrication dry ice internal cooling grinding wheel according to claim 1, characterized in that: The grinding wheel base (1) is provided with a liquid CO2 inlet channel (111), an air intake channel (112), a liquid inlet channel (113), a refrigeration chamber (114), a conical air channel (115), a lubricating liquid chamber (116), lubricating liquid micropores (117), and a liquid outlet channel (118); the liquid CO2 inlet channel (111) is directly connected to the refrigeration chamber (114); the air intake channel (112) is a set of double-hole channels, and the air intake channel (112) is connected to the air intake box (2 ) is connected, and then connected to the conical air flow channel (115) on the grinding wheel base (1) through the air hose (4) on the air inlet box (2); the liquid inlet flow channel (113) is connected to the lubricating liquid chamber (116) through the lubricating liquid pipe (5) on the flow channel side; the liquid outlet flow channel (118) is connected to the lubricating liquid chamber (116) through the lubricating liquid pipe (5) on the flow channel side; and the inner wall of the lubricating liquid chamber (116) is provided with uniformly distributed lubricating liquid micropores (117).

4. The minimal lubrication dry ice internal cooling grinding wheel according to claim 1, characterized in that: The surface of the grinding wheel disc (61) is provided with evenly distributed conical cavity air holes (611), the conical cavity air holes (611) are in communication with the conical air flow channel (115) on the grinding wheel base (1), and one side is in communication with the lubricating liquid chamber (116) on the grinding wheel base (1) through the lubricating liquid micropores (117) on the grinding wheel base (1), and the grinding wheel disc (61) is also provided with through cooling air holes (612).

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

6. A method for cooling a micro-lubrication dry ice internally cooled grinding wheel, comprising a micro-lubrication dry ice internally cooled grinding wheel according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) The minimally lubricated dry ice internally cooled grinding wheel is clamped and installed on the machine tool spindle using a standard tool holder; (2) using a liquid CO2 gas tank to connect a controllable one-way gas valve and then connect to the liquid CO2 inlet channel (111) of the minimally lubricated dry ice internally cooled grinding wheel; (3) High-pressure air intake is directly taken from the machining center and connected to the air intake channel (112) of the minimally lubricated dry ice internally cooled grinding wheel; (4) The lubricating liquid is pumped through an external pumping system to the liquid inlet channel (113) and the liquid outlet channel (118) connected to the minimal lubrication dry ice internal cooling grinding wheel, and circulated at low pressure; (5) When the grinding wheel is rotated and processed in a dry ice-cooled state, liquid CO2 is introduced directly into the refrigeration chamber (114) of the grinding wheel base (1). Due to the pressure reduction, the liquid CO2 is rapidly vaporized and absorbs heat to form dry ice in the refrigeration chamber (114). As the processing continues, a large amount of heat is generated by grinding, which accelerates the absorption of heat and vaporization of the dry ice in the refrigeration chamber (114), and then the chamber pressure increases. The vaporized CO2 gas flows out from the cooling air holes (612) on the grinding wheel disc (61), taking away a large amount of heat from the grinding area. At the same time, the lubricating fluid is introduced from the liquid 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 enters the liquid outlet channel (118) from the lubricating fluid pipe (5) on the right to flow out for circulating low-pressure pumping. Furthermore, the high-pressure gas enters the air inlet box (2) through the inlet channel (112). , and then enters the conical air flow channel (115) through the air hose (4). After the high-pressure air enters the conical air flow channel (115) and is pressurized, it enters the conical cavity air hole (611) on the grinding wheel (61). At this time, due to the flow of high-pressure air, the pressure in the conical cavity air hole (611) drops instantly, and 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 discrete action of the high-pressure air, the lubricating fluid is atomized, and the atomized lubricating fluid is ejected 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), thereby achieving effective internal cooling and internal lubrication of the grinding area.

7. The method according to claim 6, characterized in that: The method also includes that during processing, the delivery of liquid CO2 can be controlled by an external automatic control system according to specific working conditions, and the opening degree of the gas valve, as well as the intermittent opening and closing and the duration of the intermittent opening and closing can be controlled to ensure that the dry ice in the refrigeration chamber (114) can be continuously generated and consumed during processing to maintain effective and stable refrigeration, while synchronously controlling and adjusting the pressure of the intake air and the intermittent opening and closing and the duration of the intermittent opening and closing to ensure effective atomization and effective lubrication of the lubricating fluid.

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