A composite damping motorized spindle for internal cylindrical grinding of large length-diameter ratio

Abstract

This invention provides a composite vibration-damping electric spindle for high aspect ratio internal grinding, relating to the field of precision machining equipment technology. It includes a spindle housing, a drive shaft, and a passive composite vibration damping system. The passive composite vibration damping system includes multiple sets of non-contact eddy current damping components, multiple sets of built-in particle damping components, and a cooling component. The built-in particle damping components include damping particle baffles, with a sealed damping cavity arranged axially along the drive shaft between the outer wall of the damping particle baffles and the inner wall of the spindle housing. The damping cavity is filled with several damping particles. The non-contact eddy current damping components include permanent magnets fixedly disposed on the inner walls of both ends of the damping particle baffles and conductive rings sleeved on the outer wall of the drive shaft and radially opposite to the permanent magnets. A radial air gap is left between the permanent magnets and the conductive rings. This invention, through the integration of non-contact electromagnetic damping and built-in particle damping, effectively suppresses regenerative chatter of the spindle during high-speed grinding, improving machining accuracy.

Description

Technical Field

[0001] This invention relates to the field of precision machining equipment technology, and more particularly to a composite vibration-damping electric spindle for internal grinding with a large aspect ratio. Background Technology

[0002] In aerospace, automotive manufacturing, and precision instrumentation industries, the demand for machining deep holes and high-precision internal cylindrical surfaces is increasing. Internal grinding is a critical process for ensuring the geometric accuracy of such parts. However, when performing deep hole internal grinding with a large length-to-diameter ratio (L / D ratio greater than 5), the spindle tip must have a long overhang. Due to the low static and dynamic stiffness of the overhang structure, the spindle is prone to radial deflection under grinding forces, inducing strong regenerative chatter. Chatter not only severely degrades the surface quality and dimensional accuracy of the workpiece but also accelerates grinding wheel wear and may even damage the spindle bearings.

[0003] Currently, existing technologies for vibration reduction of electric spindles are mainly divided into two categories: one is to use active magnetic levitation bearings or piezoelectric actuators for active control vibration reduction, but such systems are complex in structure, bulky, and expensive, and the coils generate a lot of heat, making them difficult to adapt to the extremely limited space of internal grinding; the other is to use traditional passive vibration reduction methods such as rubber damping or friction damping, but their damping bandwidth is narrow, and they are prone to aging and failure under ultra-high speed rotation and high temperature conditions, making it difficult to meet the requirements of modern CNC machine tools for long-term stability.

[0004] Therefore, there is an urgent need for a new type of spindle vibration reduction structure that is compact, requires no complex external power supply, and can provide efficient damping over a wide frequency band, in order to solve the chatter problem in deep hole grinding with a large aspect ratio. Summary of the Invention

[0005] In view of the above-mentioned technical problems, a composite vibration-damping electric spindle for internal grinding with a large aspect ratio is provided.

[0006] The technical means employed in this invention are as follows:

[0007] A composite vibration-damping electric spindle for internal grinding with a large aspect ratio includes: a spindle housing, a drive shaft supported inside the spindle housing, and a passive composite vibration-damping system disposed at the overhanging end of the drive shaft. The drive shaft is rotatably connected inside the spindle housing through multiple sets of bearings. The rear end of the drive shaft is connected to the spindle motor through a coupling, and the front end of the drive shaft is connected to a grinding head. The passive composite vibration reduction system includes multiple sets of non-contact eddy current vibration damping components, multiple sets of built-in particle damping components, and a cooling component arranged at intervals. The multiple sets of non-contact eddy current vibration damping components and multiple sets of built-in particle damping components are disposed between the outer wall of the drive shaft and the inner wall of the main shaft housing. The cooling component is disposed on the outer side of the main shaft housing. The built-in particle damping component is arranged between two sets of non-contact eddy current vibration damping components. The non-contact eddy current vibration damping components, the built-in particle damping component, and the non-contact eddy current vibration damping components arranged sequentially along the drive shaft axis constitute a vibration reduction structure. Multiple sets of vibration reduction structures are provided, and a set of vibration reduction structures is installed between two adjacent sets of bearings. The built-in particle damping assembly includes a damping particle baffle installed on the inner wall of the main shaft housing. A sealed vibration damping cavity is provided between the outer wall of the damping particle baffle and the inner wall of the main shaft housing along the transmission shaft axis. The vibration damping cavity is filled with a number of damping particles. The non-contact eddy current vibration damping component includes permanent magnets fixedly installed on the inner walls of both ends of the damping particle baffle and conductive rings sleeved on the outer wall of the transmission shaft and radially opposite to the two permanent magnets. A radial air gap is left between the permanent magnets and the conductive rings.

[0008] Furthermore, the permanent magnet is configured as a Heilbeck permanent magnet array in a ring structure.

[0009] Furthermore, conductive ring washers are provided at both ends of the conductive ring for axial positioning, and the conductive ring is a continuous grooveless ring made of a high conductivity metal material.

[0010] Furthermore, the outer wall of the damping particle baffle has an annular groove in the middle, and the annular groove forms a closed vibration-damping cavity with the inner wall of the main shaft housing.

[0011] Furthermore, the cooling assembly includes a cooling housing disposed outside the spindle housing, and the interior of the cooling housing is configured with cooling medium channels.

[0012] Furthermore, the outer wall of the bearing has a mounting groove, and a sealing gasket is installed in the mounting groove, the sealing gasket being in sealing contact with the inner wall of the spindle housing.

[0013] Furthermore, a clamping housing is tightly fitted onto the outside of the spindle housing.

[0014] Furthermore, the housing of the spindle motor and the spindle housing are connected by a connecting flange.

[0015] Compared with the prior art, the present invention has the following advantages: 1. Purely passive, high-efficiency electromagnetic vibration damping: Utilizing a permanent magnet with a Helbeck array design, the magnetic field lines are focused to the air gap side, significantly increasing the eddy current intensity when the conductive ring cuts the magnetic field lines. This non-contact vibration damping structure requires no external power supply, introduces no contact friction, and boasts extremely high reliability.

[0016] 2. Multi-band synergistic vibration absorption: The external eddy current damping mainly provides radial electromagnetic stiffness and damping for high-frequency, small-amplitude vibrations; the internal particle damping component effectively dissipates low-frequency, large-amplitude bending resonance energy through inelastic collisions and friction between particles. The combination of the two achieves broadband composite vibration reduction.

[0017] 3. High thermal stability: It is equipped with a special cooling shell assembly, which can forcibly remove the heat generated by eddy currents, preventing thermal deformation of the slender drive shaft and avoiding irreversible demagnetization of permanent magnets due to high temperature, thus ensuring machining accuracy under extreme grinding conditions.

[0018] Based on the above reasons, this invention can be widely applied in fields such as electric spindle vibration reduction. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An overall axial sectional view of a composite vibration-damping electric spindle for high aspect ratio internal grinding provided in an embodiment of the present invention.

[0021] Figure 2 This is a partial enlarged view of the passive composite vibration reduction system and its surrounding components in an embodiment of the present invention.

[0022] Figure 3 This is a partial enlarged view of the damping particle baffle and the Heilbeck permanent magnet array in an embodiment of the present invention.

[0023] In the diagram: 1. Spindle motor; 2. Connecting flange; 3. Coupling; 4. Drive shaft; 5. Clamp housing; 6. Passive composite vibration damping system; 7. Bearing; 8. Cooling housing; 9. Grinding head; 10. Spindle housing; 11. Sealing gasket; 12. Damping particles; 13. Damping particle baffle; 14. Conductive ring washer; 15. Conductive ring; 16. Permanent magnet. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] Example 1 This invention provides a composite vibration-damping electric spindle for internal grinding with a large aspect ratio. It aims to effectively suppress regenerative chatter of the spindle during high-speed grinding and improve machining accuracy by combining innovative non-contact electromagnetic damping with built-in particle damping.

[0032] The present invention discloses a composite vibration-damping electric spindle for internal grinding with a large aspect ratio, comprising a spindle housing 10, a drive shaft 4 supported inside the spindle housing 10, and a passive composite vibration-damping system 6 disposed at the overhanging end of the drive shaft 4; a clamping housing 5 is sleeved on the outside of the spindle housing 10; the rear end of the drive shaft 4 is connected to the spindle motor 1 via a coupling 3, a connecting flange 2 is provided between the spindle motor 1 and the spindle housing 10, the front end of the drive shaft 4 is connected to a grinding head 9, and the drive shaft 4 obtains rotational support through a bearing 7; The passive composite vibration reduction system 6 includes multiple sets of non-contact eddy current vibration damping components, multiple sets of built-in particle damping components, and a cooling component arranged at intervals. The multiple sets of non-contact eddy current vibration damping components and multiple sets of built-in particle damping components are disposed between the outer wall of the drive shaft 4 and the inner wall of the main shaft housing 10, and the cooling component is disposed on the outer side of the main shaft housing 10. The built-in particle damping component is arranged between two sets of non-contact eddy current vibration damping components. The non-contact eddy current vibration damping components, the built-in particle damping component, and the non-contact eddy current vibration damping components arranged sequentially along the axial direction of the drive shaft 4 constitute a vibration reduction structure. Multiple sets of vibration reduction structures are provided, and a set of vibration reduction structures is installed between two adjacent sets of bearings 7. The non-contact eddy current vibration damping component includes permanent magnets 16 fixedly mounted on the inner walls of both ends of the damping particle baffle 13, and conductive rings 15 sleeved on the outer wall of the drive shaft 4 and radially opposite to the two permanent magnets 16. A radial air gap is left between the permanent magnets 16 and the conductive rings 15. The permanent magnets 16 are configured as a Heilbeck permanent magnet array, which consists of multiple high-temperature resistant permanent magnet units spliced ​​together in a ring structure along the circumferential direction. The magnetization direction of adjacent permanent magnet units alternates sequentially at a preset angle to unidirectionally focus the magnetic lines of force into the air gap on the side facing the conductive rings 15. Conductive ring washers 14 are provided at both ends of the conductive rings 15 for axial positioning. The conductive rings 15 are continuous grooveless rings made of high conductivity metal material. When the drive shaft 4 and the grinding head 9 rotate and radial or tangential sway occurs, the conductive rings 15 cut the concentrated magnetic lines of force to excite eddy currents, thereby generating a Lorentz damping force to suppress vibration. The built-in particle damping assembly includes a damping particle baffle 13 installed on the inner wall of the spindle housing 10. A sealed vibration damping cavity is provided between the outer wall of the damping particle baffle 13 and the inner wall of the spindle housing 10 along the drive shaft 4. The vibration damping cavity is filled with a number of damping particles 12. The damping particle baffle 13 presses against the damping particles 12 and closes the vibration damping cavity, which is used to dynamically adjust the contact normal pressure and friction energy dissipation characteristics inside the group of damping particles 12, so as to dissipate the low-frequency vibration energy of multiple natural frequencies through the inelastic collision and friction between the particle groups. The cooling assembly includes a cooling housing 8 disposed outside the spindle housing 10. The cooling housing 8 is provided with a cooling medium flow channel for introducing a forced-circulation coolant to dissipate the heat generated when the conductive ring 15 generates eddy currents, and to prevent thermal deformation of the spindle and demagnetization of the permanent magnet 16.

[0033] Example 2 Please see Figure 1 and Figure 2 This invention provides a composite vibration-damping electric spindle for internal grinding with a large aspect ratio. It mainly includes a drive shaft 4, a passive composite vibration damping system 6, and a spindle housing 10. The rear end of the drive shaft 4 is connected to the spindle motor 1 via a coupling 3. The electric spindle has a slender overall structure to accommodate the machining requirements of deep holes. Its power transmission path is as follows: the spindle motor 1 outputs power, which is transmitted to the drive shaft 4 via the coupling 3. The housing of the spindle motor 1 and the spindle housing 10 are securely connected via a connecting flange 2. The drive shaft 4 is supported inside the spindle housing 10 by several sets of built-in bearings 7, and a grinding head 9 for mounting the grinding wheel is connected to its front end. To facilitate machine tool clamping and further improve structural rigidity, a clamping housing 5 is tightly fitted onto the outside of the spindle housing 10. This clamping housing 5 adopts a cylindrical sleeve structure, thereby increasing structural rigidity by increasing the wall thickness.

[0034] To address the problem of chattering easily occurring at the overhanging end of the drive shaft 4 and grinding head 9 during grinding due to the large length-to-diameter ratio, this invention innovatively arranges a passive composite vibration damping system 6 in the core area at the front end of the drive shaft 4. This system is composed of three parts working together: a non-contact eddy current vibration damping component, a built-in particle damping component, and a cooling component.

[0035] On the one hand, non-contact eddy current vibration damping components provide powerful targeted electromagnetic damping. For example... Figure 1 As shown, multiple sets of non-contact eddy current vibration damping components are arranged at intervals. These multiple sets of non-contact eddy current vibration damping components are positioned between the outer wall of the drive shaft 4 and the inner wall of the main shaft housing 10. Figure 2 As shown, permanent magnets 16 are fixedly installed on the inner walls (stator side) at both ends of the damping particle baffle 13. Preferably, the permanent magnets 16 are made of high-temperature resistant samarium cobalt alloy or high-temperature resistant neodymium iron boron material and are configured as a Heilbeck permanent magnet array. This array consists of multiple permanent magnet units spliced ​​together in a ring structure along the circumferential direction, and the magnetization direction of adjacent units alternates at a preset angle (such as 45 degrees or 90 degrees). This special array can unidirectionally and extremely focus the magnetic lines of force into the air gap on the inner side of the array, while there is almost no magnetic leakage on the outer side. Correspondingly, a conductive ring 15 is fixedly sleeved on the outer wall (rotor side) of the drive shaft 4, and each permanent magnet 16 is radially opposite to a conductive ring 15. The conductive ring 15 is made of a high conductivity material such as copper or high-strength aluminum alloy and has a continuous grooveless structure. The two ends of the conductive ring 15 are axially limited and prevented from loosening by conductive ring washers 14. A small radial air gap (preferably between 0.5 mm and 1.5 mm) is reserved between the radially opposite permanent magnet 16 and the conductive ring 15. When the drive shaft 4 drives the grinding head 9 to rotate at high speed and causes radial or tangential wobbling under the action of cutting force, the conductive ring 15 wobbles accordingly and violently cuts the high-density magnetic field lines of the Heilbeck array. According to Faraday's law of electromagnetic induction and Lenz's law, a strong eddy current is instantaneously excited inside the conductive ring 15. This eddy current is subjected to the Lorentz force in the magnetic field, and its direction is always opposite to the direction of vibration velocity, thus forming a very considerable viscous damping force, which converts the vibration mechanical energy into electrical energy and finally into heat energy dissipation.

[0036] On the other hand, the built-in particle damping components are responsible for absorbing low-frequency bending resonance energy. Multiple sets of these built-in particle damping components are arranged at intervals between the outer wall of the drive shaft 4 and the inner wall of the main shaft housing 10. For example... Figure 1 and Figure 2As shown, the built-in particle damping assembly includes damping particle baffles 13 installed on the inner wall of the spindle housing 10. A blind-hole-shaped damping cavity is axially formed between the outside of the drive shaft 4 and the front end of the grinding head 9, meaning a sealed damping cavity is formed axially between the outer wall of each damping particle baffle 13 and the inner wall of the spindle housing 10. The damping cavity is filled with several damping particles 12 (such as high-density tungsten alloy balls or hard alloy balls). Multiple damping particle baffles 13 and multiple sealing washers 11 are sequentially press-fitted or screwed into the space between the outside of the drive shaft 4 and the spindle housing 10, forming a damping cavity between the outer wall of the damping particle baffles 13 and the inner wall of the spindle housing 10. The outer wall of the bearing 7 has an installation groove, and the sealing washers 11 are installed in the installation groove, making sealing contact with the inner wall of the spindle housing 10. The damping particle baffles 13 not only seal the cavity but, more importantly, compress the damping particles 12. By adjusting the insertion depth of the damping particle baffle 13 during assembly, the contact normal pressure inside the particle group can be changed. When the spindle is working, when the long overhanging drive shaft 4 undergoes bending vibration, the internal damping particles 12 generate severe friction and inelastic collisions, converting the macroscopic mechanical vibration kinetic energy into microscopic heat dissipation, which can effectively extend the stable cutting limit depth of the spindle.

[0037] In this embodiment, multiple sets of built-in particle damping components are arranged along the axial direction of the drive shaft 4 between the drive shaft 4 and the main shaft housing 10. These built-in particle damping components are positioned between two sets of non-contact eddy current vibration damping components. The non-contact eddy current vibration damping components, built-in particle damping components, and non-contact eddy current vibration damping components arranged sequentially along the axial direction of the drive shaft 4 constitute a vibration damping structure (in this vibration damping structure, a set of built-in particle damping components is arranged between adjacent non-contact eddy current vibration damping components). Multiple sets of this vibration damping structure are provided, with several sets of bearings 7 arranged at intervals. A vibration damping structure is installed between any two adjacent sets of bearings 7, i.e., bearings 7 and vibration damping structures are arranged alternately. Figure 2 As shown, the outer wall of the damping particle baffle 13 has an annular groove in the middle, and the annular groove forms a closed vibration damping cavity with the inner wall of the main shaft housing 10.

[0038] Furthermore, the cooling components ensure the thermal stability of the vibration damping system. Eddy current energy consumption and particle friction both generate significant heat. Therefore, in this embodiment, a cooling shell 8 is wrapped around the front end of the spindle housing 10. The cooling shell 8 has spiral or zigzag cooling medium channels machined inside. Cooling water or cutting fluid pumped by an external coolant station is forced to circulate within the channels (during deep hole internal grinding, the coolant is continuously circulated), which can quickly remove the heat from the conductive ring 15 and the permanent magnet 16 area, completely eliminating the problems of thermal expansion bias of the drive shaft 4 and demagnetization failure of the permanent magnet 16 caused by high temperature.

[0039] The composite vibration-damping electric spindle provided by this invention fundamentally solves the chatter problem of electric spindles with large aspect ratios through a dual passive vibration reduction mechanism of targeted suppression by high magnetic flux density eddy currents in the outer ring and physical collision dissipation of particles in the inner core. It significantly improves the geometric accuracy and surface roughness level of deep hole internal grinding and has extremely high industrial practical value.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite vibration-damping electric spindle for internal grinding with a large aspect ratio, characterized in that, include: The main shaft housing (10), the drive shaft (4) supported inside the main shaft housing (10), and the passive composite vibration damping system (6) set at the overhanging end of the drive shaft (4) are provided. The drive shaft (4) is rotatably connected inside the main shaft housing (10) through multiple sets of bearings (7). The rear end of the drive shaft (4) is connected to the main shaft motor (1) through a coupling (3). The front end of the drive shaft (4) is connected to a grinding head (9). The passive composite vibration reduction system (6) includes multiple sets of non-contact eddy current vibration reduction components, multiple sets of built-in particle damping components, and a cooling component arranged at intervals. The multiple sets of non-contact eddy current vibration reduction components and multiple sets of built-in particle damping components are arranged between the outer wall of the transmission shaft (4) and the inner wall of the main shaft housing (10). The cooling component is arranged on the outside of the main shaft housing (10). The built-in particle damping component is arranged between two sets of non-contact eddy current vibration reduction components. The non-contact eddy current vibration reduction components, the built-in particle damping component, and the non-contact eddy current vibration reduction components arranged sequentially along the axial direction of the transmission shaft (4) constitute a vibration reduction structure. Multiple sets of vibration reduction structures are provided. A set of vibration reduction structures is installed between two adjacent sets of bearings (7). The built-in particle damping assembly includes a damping particle baffle (13) installed on the inner wall of the main shaft housing (10). A sealed vibration reduction cavity is provided between the outer wall of the damping particle baffle (13) and the inner wall of the main shaft housing (10) along the axial direction of the transmission shaft (4). The vibration reduction cavity is filled with a number of damping particles (12). The non-contact eddy current vibration damping assembly includes permanent magnets (16) fixedly installed on the inner walls of both ends of the damping particle baffle (13) and conductive rings (15) sleeved on the outer wall of the transmission shaft (4) and radially opposite to the two permanent magnets (16). A radial air gap is left between the permanent magnets (16) and the conductive rings (15).

2. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The permanent magnet (16) is configured as a Heilbeck permanent magnet array in a ring structure.

3. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The conductive ring (15) is provided with conductive ring washers (14) at both ends for axial positioning. The conductive ring (15) is a continuous grooveless ring made of a high conductivity metal material.

4. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The outer wall of the damping particle baffle (13) has an annular groove in the middle, and the annular groove forms a closed vibration damping cavity with the inner wall of the main shaft housing (10).

5. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The cooling assembly includes a cooling housing (8) disposed outside the spindle housing (10), and the interior of the cooling housing (8) is provided with cooling medium channels.

6. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The bearing (7) has an installation groove on its outer wall, and a sealing gasket (11) is installed in the installation groove. The sealing gasket (11) is in sealing contact with the inner wall of the spindle housing (10).

7. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The spindle housing (10) is tightly fitted with a clamping housing (5).

8. The composite vibration-damping electric spindle for large aspect ratio internal grinding according to claim 1, characterized in that, The housing of the spindle motor (1) is connected to the spindle housing (10) via a connecting flange (2).

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