A spindle device and a grinding apparatus

Abstract

The application discloses a spindle device and a grinding equipment, and relates to the technical field of precision grinding. The spindle device comprises a spindle body, a spindle motor, a screw mechanism, a motor cooling structure and a tool cooling structure. The spindle body comprises a shell and a support part. The support part is rotatably arranged in the shell and is used for supporting a tool. The spindle motor is used for driving the support part to rotate. The screw mechanism is arranged along the axial direction of the spindle body to drive the spindle body to move. The motor cooling structure comprises a motor cooling channel and a refrigerant isolation sleeve. The motor cooling channel is used for allowing refrigerant to flow through the refrigerant isolation sleeve to control the temperature of the spindle motor. The tool cooling structure comprises a tool cooling pipeline. The tool cooling pipeline is used for conveying refrigerant to the tool tip of the tool to cool the tool tip. The spindle device improves the problems of vibration, thermal drift, main grinding load and driving eccentric load in the grinding process, improves the temperature control effect and the tool cooling effect, and thus improves the control precision and the machining surface quality.

Description

Technical Field

[0001] This application relates to the field of precision grinding technology, and in particular to a spindle device and grinding equipment. Background Technology

[0002] Grinding equipment is a precision grinding process, primarily used for surface grinding of metals or other hard materials to achieve high precision and surface finish. Grinding equipment is widely used in machining, automotive manufacturing, aerospace, precision instruments, and other fields.

[0003] In existing systems, grinding equipment includes a spindle that rotates the cutting tool. During precision grinding, spindle temperature control and cutting tool cooling are two key technical aspects. Spindle temperature control directly affects its operational stability and lifespan, while cutting tool cooling relates to the quality and precision of the machined surface. Currently, air cooling or water cooling is commonly used to control the spindle motor temperature to ensure stable operation. Simultaneously, the cooling effect of the cutting tool is improved by adjusting its material and structure, as well as optimizing grinding parameters, thereby enhancing the quality of the machined surface.

[0004] However, in the process of realizing this invention, the inventors discovered at least the following problems:

[0005] First, vibration and thermal drift during the grinding process can lead to reduced control accuracy and deterioration of the machined surface quality. Second, the main grinding load and drive off-center load can also affect control accuracy and machined surface quality. Furthermore, while existing temperature control and tool cooling technologies can solve these problems to some extent, their effectiveness is limited and they may have some environmental impact.

[0006] Therefore, how to improve vibration, thermal drift, main grinding load and drive off-center load, temperature control and tool cooling effect during the grinding process are technical problems that need to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this application is to provide a spindle device and grinding equipment that solves the problems of reduced control accuracy and deteriorated surface quality caused by vibration, thermal drift, main grinding load and drive off-center load, poor temperature control and tool cooling effect during the grinding process.

[0008] To achieve the above objectives, this application provides a spindle device for use in grinding equipment, comprising:

[0009] The spindle body includes a housing and a support portion. The support portion is rotatably disposed within the housing and is used to support the cutting tool so that the cutting tool can rotate.

[0010] The main spindle motor is located inside the housing and connected to the support unit, and is used to drive the support unit to rotate relative to the housing.

[0011] The lead screw mechanism is set along the axis of the spindle body and connected to the spindle body. It is used to drive the spindle body to move in order to control the tool feed.

[0012] The motor cooling structure includes a motor cooling channel and a refrigerant diaphragm. The motor cooling channel is located on the housing, and the refrigerant diaphragm is located on the housing along the circumferential direction and embedded in the spindle motor. The motor cooling channel is connected to the refrigerant diaphragm and is used to allow the refrigerant to flow through the refrigerant diaphragm to control the temperature of the spindle motor.

[0013] The tool cooling structure includes a tool cooling pipe, one end of which is close to the tool tip. The tool cooling pipe is used to deliver refrigerant to the tool tip to cool it.

[0014] In some embodiments, the tool cooling structure further includes a tool cooling channel disposed in the housing;

[0015] The tool cooling system includes a first pipe and a second pipe. The first pipe is fixed to the support, and the second pipe passes through the first pipe. One end of the second pipe is connected to the tool cooling channel, and the other end is close to the tip of the tool.

[0016] In some embodiments, the spindle assembly further includes:

[0017] The bearing body includes an inner ring and an outer ring. The inner ring is connected to the housing, and the outer ring is connected to the support.

[0018] The bearing cooling channel is located in the housing and connects to the inner ring, allowing refrigerant to flow through the inner ring to cool the bearing body.

[0019] In some embodiments, the spindle assembly further includes a refrigerant supply module, which is connected to the motor cooling channel, the tool cooling channel, and the bearing cooling channel. The refrigerant supply module is used to supply refrigerant to the motor cooling channel, the tool cooling channel, and the bearing cooling channel, respectively.

[0020] In some embodiments, the refrigerant supply module includes a refrigerant container, a cooler unit, and a refrigerant pump. The cooler unit is installed between the refrigerant container and the refrigerant pump. The refrigerant pump is used to deliver the refrigerant in the refrigerant container to the motor cooling channel, the cutting tool cooling channel, and the bearing cooling channel. The cooler unit is used to cool the refrigerant.

[0021] In some embodiments, the spindle assembly further includes a temperature control module, which includes:

[0022] A temperature sensor, located in the spindle body, is used to detect the temperature of the spindle body.

[0023] The controller communicates with the temperature sensor and the refrigerant supply module, and is used to control the opening and closing of the refrigerant supply module based on the data detected by the temperature sensor.

[0024] In some embodiments, the housing is provided with a dry air inlet for introducing dry air into the housing to air-cool the spindle motor inside the housing.

[0025] In some embodiments, a labyrinth seal is provided between the housing and the support, through which dry air entering the housing via the dry air inlet is discharged from the housing.

[0026] In some embodiments, the tool cooling structure further includes at least two tool cooling nozzles, which are located at the end of the housing away from the lead screw mechanism and facing the tool. The at least two tool cooling nozzles are used to spray refrigerant onto the tool tip to cool the tool tip.

[0027] This application also provides a grinding apparatus, including the spindle assembly described in any of the above claims.

[0028] Compared with the above background technology, the spindle device provided in this application embodiment is applied to grinding equipment. The spindle device includes a spindle body, a spindle motor, a lead screw mechanism, a motor cooling structure, and a tool cooling structure. The spindle body includes a housing and a support section. The support section is rotatably disposed within the housing and is used to support the cutting tool so that the tool can rotate. The spindle motor is disposed within the housing and is connected to the support section. The spindle motor is used to drive the support section to rotate relative to the housing. A lead screw mechanism is disposed along the axial direction of the spindle body and is connected to the spindle body. The lead screw mechanism is used to drive the spindle body to move so as to control the tool feed. The motor cooling structure includes a motor cooling channel and a refrigerant sleeve. The motor cooling channel is disposed within the housing, and the refrigerant sleeve is disposed on the housing in a circumferential direction and embedded in the spindle motor. The motor cooling channel is connected to the refrigerant sleeve and is used to allow refrigerant to flow through the refrigerant sleeve so as to control the temperature of the spindle motor. The cutting tool cooling structure includes a cutting tool cooling pipe. One end of the cutting tool cooling pipe is close to the cutting tool tip and is used to deliver refrigerant to the cutting tool tip to cool the cutting tool tip.

[0029] With this configuration, the spindle unit controls the spindle motor temperature through a motor cooling structure, primarily utilizing a refrigerant bushing to cool the motor. This bushing is circumferentially embedded within the motor for direct cooling. Simultaneously, a tool cooling structure delivers refrigerant to the tool tip for direct cooling. Compared to traditional methods of controlling the spindle body temperature and cooling the tool, this spindle unit improves both temperature control and tool cooling during grinding, effectively mitigating vibration and thermal drift issues, thus enhancing grinding precision and surface finish. Furthermore, the lead screw mechanism driving the spindle body is positioned along its axial direction. This center-of-gravity drive method solves the problems of uneven grinding load and lead screw drive in traditional methods, further improving grinding precision and surface finish. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the spindle device in an embodiment of this application;

[0032] Figure 2 for Figure 1 The diagram shows the connection of the temperature sensor, controller, and refrigerant supply module in the spindle assembly.

[0033] in:

[0034] 10-Spindle body, 11-Housing, 111-Dry air inlet, 12-Support part, 13-Labyrinth seal;

[0035] 20 - Main spindle motor, 21 - Motor stator, 22 - Motor rotor;

[0036] 30 - Lead screw mechanism, 31 - Drive lead screw, 32 - Lead screw nut;

[0037] 40 - Motor cooling structure, 41 - Motor cooling channel, 42 - Refrigerant jacket;

[0038] 50-Tool cooling structure, 51-Tool cooling pipeline, 511-First pipe, 512-Second pipe, 52-Tool cooling channel, 53-Tool cooling nozzle;

[0039] 60 - Bearing body, 61 - Inner ring, 62 - Outer ring;

[0040] 70 - Bearing cooling channel;

[0041] 80 - Temperature sensor;

[0042] 90-Controller;

[0043] 100 - Refrigerant supply module;

[0044] 110 - Cutting tools. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0048] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the spindle device in an embodiment of this application; Figure 2 for Figure 1 The diagram shows the connection of the temperature sensor, controller, and refrigerant supply module in the spindle assembly.

[0049] The spindle device provided in this application embodiment is applied to grinding equipment. The spindle device includes a spindle body 10, a spindle motor 20, a lead screw mechanism 30, a motor cooling structure 40, and a tool cooling structure 50.

[0050] The spindle body 10 includes a housing 11 and a support 12. The support 12 is rotatably disposed within the housing 11 and is used to support the tool 110 so that the tool 110 can rotate. The support 12 can be configured as a base structure, and the tool 110 is mounted at the center of the bottom of the base structure.

[0051] The spindle motor 20 is located inside the housing 11. The housing 11 and the support part 12 together form a sealed cavity. The spindle motor 20 is installed in the sealed cavity. Specifically, the spindle motor 20 includes a motor stator 21 and a motor rotor 22. The stator part is installed in the housing 11, and the rotor part is installed in the support part 12. As the rotor of the spindle motor 20 rotates, the rotor drives the support part 12 to rotate relative to the housing 11, thereby driving the tool 110 to rotate.

[0052] In some embodiments, the spindle motor 20 has a power of 11kW, a speed of 3000r / min, a rated voltage of 380V, and a rated current of 26A.

[0053] The lead screw mechanism 30 is arranged along the axis of the spindle body 10. The lead screw mechanism 30 includes a drive lead screw 31 and a lead screw nut 32. The drive lead screw 31 has a diameter of 50 mm and a length of 1000 mm, and is made of high-strength alloy steel with a hardened surface to ensure its strength and wear resistance. The lead screw nut 32 is connected to the housing 11 of the spindle body 10. As the drive lead screw 31 rotates, the lead screw nut 32 drives the spindle body 10 to move along its axis. Thus, the spindle body 10 is moved via the lead screw mechanism 30 to control the feed of the tool 110. Furthermore, the lead screw mechanism 30 is connected to a control system. Using a high-precision lead screw mechanism 30 and an advanced control system, compared to existing lead screw drive systems, the spindle device of this application has higher precision and stability, better meeting the needs of precision grinding.

[0054] The motor cooling structure 40 includes a motor cooling channel 41 and a refrigerant sleeve 42. The motor cooling channel 41 is located in the housing 11, and the refrigerant sleeve 42 is located on the inner wall of the housing 11 along the circumferential direction and embedded in the motor stator 21 of the spindle motor 20. The motor cooling channel 41 is connected to the refrigerant sleeve 42 and is used to allow refrigerant to flow through the refrigerant sleeve 42 to control the temperature of the spindle motor 20.

[0055] The motor cooling channel 41 includes a motor refrigerant input channel and a motor refrigerant output channel. The refrigerant enters the motor refrigerant input channel through the motor refrigerant inlet, then flows into the refrigerant sleeve 42 to cool the motor stator 21, and then flows out of the main shaft body 10 through the motor refrigerant output channel and the motor refrigerant outlet, thereby realizing the cooling cycle for the motor.

[0056] Furthermore, the side wall of the motor stator 21 opposite to the motor rotor 22 is provided with an embedding groove, and at least part of the structure of the refrigerant bushing 42 is embedded in the embedding groove so that the refrigerant can flow inside the motor stator 21, thereby further improving the cooling effect on the motor stator 21.

[0057] Preferably, there are multiple embedded slots, which are arranged at intervals along the axial direction of the motor stator 21. Correspondingly, the refrigerant sleeve 42 is provided with multiple protrusions, each of which is embedded in the corresponding embedded slot. This increases the contact area between the refrigerant and the spindle motor 20, thereby improving the cooling effect.

[0058] The tool cooling structure 50 includes a tool cooling pipe 51, one end of which is close to the tip of the tool 110. The tool cooling pipe 51 is used to deliver refrigerant to the tip of the tool 110 to cool the tip of the tool 110. The tool cooling pipe 51 can be built into the spindle body 10 or located outside the spindle motor 20.

[0059] With this configuration, the spindle device controls the temperature of the spindle motor 20 through the motor cooling structure 40, and mainly uses the refrigerant bushing 42 to cool the spindle motor 20. The refrigerant bushing 42 is constructed to be embedded in the spindle motor 20 along the circumferential direction for direct cooling of the spindle motor 20. At the same time, the refrigerant is delivered to the tip of the tool 110 through the tool cooling structure 50 to directly cool the tip of the tool 110. Compared with the traditional temperature control of the spindle body 10 and cooling of the tool 110, this spindle device improves the temperature control effect of the spindle body 10 and the cooling effect of the tool 110 during the grinding process, effectively improving the problems of vibration and thermal drift during the grinding process, thereby improving the control accuracy and surface quality of the grinding process.

[0060] Furthermore, in this spindle device, the lead screw mechanism 30 used to drive the spindle body 10 to move is set along the axial direction of the spindle body 10. By adopting this center-of-gravity drive method, the problems of traditional main grinding load and lead screw drive off-center load are solved, thereby further improving the control accuracy and surface quality of grinding.

[0061] It should be noted that the tips of the lead screw mechanism 30, the spindle body 10 and the cutting tool 110 can be set on the same axis, which can further improve the main grinding load and the lead screw drive off-center load problem.

[0062] In some embodiments, the tool cooling pipe 51 is a pipe built into the spindle body 10. The pipe passes through the support part 12 and the tool 110. Correspondingly, the tool cooling structure 50 also includes a tool cooling channel 52. The tool cooling channel 52 is disposed in the housing 11 and communicates with the tool cooling pipe 51 for delivering coolant to the tip of the tool 110.

[0063] In this embodiment, the tool cooling pipe 51 includes a first pipe 511 and a second pipe 512. The first pipe 511 serves as an outer sleeve and is fixed to the support part 12. The second pipe 512 serves as an inner pipe and passes through the first pipe 511. The first pipe 511 can rotate relative to the second pipe 512. One end of the second pipe 512 is connected to the tool cooling channel 52, and the other end is close to the tip of the tool 110.

[0064] Preferably, the diameter of the first tube 511 is in the range of 15-35mm, and the diameter of the second tube 512 is in the range of 5-25mm, both of which are made of corrosion-resistant stainless steel.

[0065] In this way, during the grinding process driven by the support 12, the refrigerant can be delivered to the tip of the tool 110 through the tool cooling channel 52 and the second pipe 512 to provide concentrated cooling for the tip of the tool 110.

[0066] In some embodiments, the tool cooling structure 50 further includes at least two tool cooling nozzles 53, which are located at one end of the housing 11 away from the lead screw mechanism 30 and facing the tool 110. The at least two tool cooling nozzles 53 are used to spray refrigerant onto the tip of the tool 110 to cool the tip of the tool 110.

[0067] It is understandable that the above-mentioned at least two tool cooling nozzles 53 serve as external tool cooling structures 50, and the tool cooling channel 52 and tool cooling pipe 51 serve as internal tool cooling structures 50. Together, they cool the tip of the tool 110, greatly improving the cooling effect on the tool 110.

[0068] It should be emphasized that the decision to activate the built-in tool cooling structure 50 and the external tool cooling structure 50 is based on the actual cooling requirements. For example, as the first stage of cooling, only the built-in tool cooling structure 50 can be activated. As the second stage of cooling, in addition to activating the built-in tool cooling structure 50, one tool cooling nozzle 53 on one side can be activated. As the third stage of cooling, in addition to activating the built-in tool cooling structure 50, two tool cooling nozzles 53 on both sides can be activated.

[0069] Of course, the refrigerant injection pressure and rate of the cooling nozzle can also be adjusted according to the actual cooling needs of the tool 110.

[0070] In some embodiments, the spindle assembly further includes a bearing body 60, which includes an inner ring 61 and an outer ring 62. The inner ring 61 is connected to the housing 11, and the outer ring 62 is connected to the support portion 12. That is, the inner ring 61 is supported on the housing 11, the outer ring 62 is supported on the support portion 12, and a rotating body is provided between the outer ring 62 and the inner ring 61. This enables the spindle motor 20 to drive the support portion 12 to rotate stably relative to the housing 11, thereby achieving the grinding operation of the tool 110.

[0071] To facilitate further cooling of the spindle body 10, the spindle assembly also includes a bearing cooling channel 70. The bearing cooling channel 70 is located in the housing 11 and connects to the inner ring 61. The bearing cooling channel 70 is used to supply refrigerant to flow through the inner ring 61 to cool the bearing body 60.

[0072] The bearing cooling channel 70 includes a bearing refrigerant input channel and a bearing refrigerant output channel. The refrigerant enters the bearing refrigerant input channel through the bearing refrigerant inlet, then flows into the inner ring 61 to cool the bearing, and then flows out of the spindle body 10 through the bearing refrigerant output channel and the bearing refrigerant outlet, thereby realizing the cooling cycle for the bearing.

[0073] Of course, depending on actual needs, the above-mentioned motor cooling structure 40, tool cooling structure 50 and bearing cooling channel 70 can share the same refrigerant supply module. That is, the refrigerant supply module provides the corresponding refrigerant to the motor cooling structure 40, tool cooling structure 50 and bearing cooling channel 70 respectively.

[0074] In some embodiments, the spindle device further includes a refrigerant supply module 100, which is connected to the motor cooling channel 41, the tool cooling channel 52 and the bearing cooling channel 70. The refrigerant supply module 100 is used to supply refrigerant to the motor cooling channel 41, the tool cooling channel 52 and the bearing cooling channel 70 respectively.

[0075] Specifically, the refrigerant supply module 100 includes a refrigerant container, a cooler unit, and a refrigerant pump. The refrigerant container is used to hold refrigerant. The cooler unit is installed between the refrigerant container and the refrigerant pump. The refrigerant pump is used to pump the refrigerant in the refrigerant container to the motor cooling channel 41, the tool cooling channel 52, and the bearing cooling channel 70. The cooler unit is used to cool the refrigerant.

[0076] More specifically, the cooler unit includes a compressor, an expansion valve, a condenser, and an evaporator. The condenser is installed between the compressor outlet and the expansion valve inlet, the expansion valve is installed between the condenser outlet and the evaporator inlet, and the evaporator outlet is connected to the compressor inlet, thereby forming a refrigeration cycle for the refrigerant.

[0077] Cooling water or engine oil can be used as a refrigerant. Using cooling water helps prevent the refrigerant from impacting the environment. Of course, other environmentally friendly materials can also be used to reduce environmental impact.

[0078] In some embodiments, the spindle assembly further includes a temperature control module, which includes a temperature sensor 80 and a controller 90. The temperature sensor 80 is disposed in the spindle body 10 and is used to detect the temperature of the spindle body 10. The controller 90 is communicatively connected to the temperature sensor 80 and the refrigerant supply module 100, and is used to control the opening and closing of the refrigerant supply module 100 based on the data detected by the temperature sensor 80.

[0079] For example, a temperature sensor 80 can be installed on the motor stator 21. This temperature sensor 80 is used to detect the temperature of the spindle motor 20. When the temperature of the spindle motor 20 reaches a threshold, the controller 90 sends a control command to the refrigerant supply module 100, causing the refrigerant supply module 100 to start and supply refrigerant to the motor cooling structure 40. Of course, multiple temperature sensors 80 can be installed, and the temperature sensors 80 can also be installed on the bearing or the housing 11.

[0080] Preferably, the temperature sensor 80 is a DS18B20 with an accuracy of ±0.5℃, used to monitor the temperature of the spindle motor 20 in real time, and the temperature controller 90 is a PID controller 90 with a response time of 0.1s, used to automatically adjust the temperature of the spindle motor 20 according to the signal from the temperature sensor 80, so as to keep it within the set range.

[0081] In some embodiments, the housing 11 is provided with a dry air inlet 111, which is used to introduce dry air into the housing 11 to cool the spindle motor 20 inside the housing 11.

[0082] In this embodiment, a flow guiding structure can also be provided inside the housing 11. The flow guiding structure can be a flow guiding plate or a flow guiding channel. The dry air entering from the dry air inlet 111 flows to the motor stator 21 after being guided by the flow guiding structure, thereby providing concentrated cooling for the coils of the motor stator 21. This can greatly improve the cooling effect on the spindle motor 20.

[0083] In some embodiments, a labyrinth seal 13 is provided between the housing 11 and the support 12, and the dry air that enters the housing 11 through the dry air inlet 111 is discharged from the housing 11 through the labyrinth seal 13.

[0084] As can be seen, the labyrinth seal 13 is located between the housing 11 and the support 12. The labyrinth seal 13 can seal the gap between the housing 11 and the support 12 to a certain extent. The labyrinth seal 13 is waterproof and can prevent external liquids from entering the housing 11, thereby ensuring the cleanliness of the inside of the housing 11. The dry air inside the housing 11 can be discharged from the housing 11 through the labyrinth seal 13.

[0085] In practical operation, this application uses a temperature control system to maintain the temperature of the spindle motor 20 within the range of 24-28℃ to ensure its stability and reliability. Simultaneously, the tool cooling structure 50 cools the tip of the machining tool 110 to reduce the main grinding load and the lead screw drive off-center load, thereby improving control accuracy and surface finish. This configuration effectively solves the problems of reduced control accuracy and deteriorated surface finish caused by vibration, thermal drift, and the main grinding load and lead screw drive off-center load during the grinding process.

[0086] The grinding equipment provided in this application includes the spindle device described in the above specific embodiments; other parts of the grinding equipment can be referred to in related technologies, and will not be elaborated here.

[0087] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0088] The spindle device and grinding equipment provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A spindle assembly, used in grinding equipment, characterized in that, include: A spindle body, the spindle body including a housing and a support portion, the support portion being rotatably disposed within the housing, the support portion being used to support the cutting tool so that the cutting tool can rotate; A main spindle motor is disposed inside the housing and connected to the support portion, for driving the support portion to rotate relative to the housing. The main spindle motor includes a motor stator mounted on the housing and a motor rotor mounted on the support portion. A lead screw mechanism is arranged along the axial direction of the spindle body and connected to the spindle body, used to drive the spindle body to move in order to control the tool feed; A motor cooling structure includes a motor cooling channel and a refrigerant sleeve. The motor cooling channel is located in the housing, and the refrigerant sleeve is located on the housing along the circumferential direction and embedded in the spindle motor. The motor cooling channel is connected to the refrigerant sleeve and is used to allow refrigerant to flow through the refrigerant sleeve to control the temperature of the spindle motor. A tool cooling structure includes a tool cooling pipe, one end of which is close to the tool tip. The tool cooling pipe is used to deliver refrigerant to the tool tip to cool the tool tip. The tool cooling structure further includes a tool cooling channel, which is disposed in the housing; The tool cooling pipeline includes a first pipe and a second pipe. The first pipe is fixed to the support part, and the second pipe passes through the first pipe. The first pipe can rotate relative to the second pipe, and one end of the second pipe is connected to the tool cooling channel, while the other end is close to the tip of the tool. The motor stator has multiple embedding slots on the side wall away from the motor rotor. The multiple embedding slots are spaced apart along the axial direction of the motor stator. The refrigerant sleeve has multiple protrusions, and each protrusion is embedded in the corresponding embedding slot.

2. The spindle device as described in claim 1, characterized in that, The spindle assembly also includes: The bearing body includes an inner ring and an outer ring, the inner ring being connected to the housing and the outer ring being connected to the support portion; A bearing cooling channel is provided in the housing and connected to the inner ring, for supplying refrigerant to flow through the inner ring to cool the bearing body.

3. The spindle device as described in claim 2, characterized in that, The spindle assembly also includes a refrigerant supply module, which is connected to the motor cooling channel, the tool cooling channel, and the bearing cooling channel. The refrigerant supply module is used to supply refrigerant to the motor cooling channel, the tool cooling channel, and the bearing cooling channel, respectively.

4. The spindle device as described in claim 3, characterized in that, The refrigerant supply module includes a refrigerant container, a cooler unit, and a refrigerant pump. The cooler unit is installed between the refrigerant container and the refrigerant pump. The refrigerant pump is used to deliver the refrigerant in the refrigerant container to the motor cooling channel, the cutting tool cooling channel, and the bearing cooling channel. The cooler unit is used to cool the refrigerant.

5. The spindle device as described in claim 3, characterized in that, The spindle assembly further includes a temperature control module, which comprises: A temperature sensor, located in the spindle body, is used to detect the temperature of the spindle body; The controller is communicatively connected to the temperature sensor and the refrigerant supply module, and is used to control the opening and closing of the refrigerant supply module based on the data detected by the temperature sensor.

6. The spindle assembly as described in any one of claims 1-5, characterized in that, The housing is provided with a dry air inlet, which is used to introduce dry air into the housing to air-cool the spindle motor inside the housing.

7. The spindle assembly as described in claim 6, characterized in that, A labyrinth seal is provided between the housing and the support, and the dry air that enters the housing through the dry air inlet is discharged from the housing through the labyrinth seal.

8. The spindle assembly as described in any one of claims 1-5, characterized in that, The tool cooling structure further includes at least two tool cooling nozzles, which are located at the end of the housing away from the lead screw mechanism and facing the tool. The at least two tool cooling nozzles are used to spray refrigerant onto the tool tip to cool the tool tip.

9. A grinding device, characterized in that, Includes the spindle assembly as described in any one of claims 1-8.

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