CN217749366U - High-speed high-precision spindle mechanism for machining center machine - Google Patents

Abstract

A high-speed high-precision spindle mechanism for a machining center comprises a spindle, a built-in motor, an eccentric compensation assembly and a spiral cooling sleeve; the front bearing group and the rear bearing group are respectively arranged on the front end excircle and the rear end excircle of the main shaft, and the built-in motor is arranged between the front bearing group and the rear bearing group; the built-in motor is an asynchronous motor and consists of a rotor, a stator and a casing from inside to outside, and the rotor is assembled on the main shaft in a hot pressing mode. Machining center machine high-speed high accuracy main shaft mechanism, structural design is reasonable, discerns and compensates through eccentric compensation subassembly to the eccentricity of main shaft and improves, avoids eccentric centre to influence the gyration precision of main shaft, through setting up the cooling runner in the spiral cooling jacket cooperation casing, cools off the heat dissipation to preceding bearing group, back bearing group, stator, avoids the main shaft thermal elongation that main shaft mechanism temperature risees and the machining precision that heat altered shape leads to reduce, application prospect is extensive.

Description

High-speed high-precision spindle mechanism for machining center machine

Technical Field

The utility model relates to a main shaft technical field, concretely relates to machining center machine is with high-speed high accuracy main shaft mechanism.

Background

A main shaft mechanism of the machining center machine is a core part of the machining center machine. The spindle mechanism of the machining center machine is divided into a mechanical spindle unit and an electric spindle unit. From the aspect of processing scenes, the mechanical spindle unit is more suitable for heavy-load cutting, and the electric spindle is more suitable for high-speed cutting such as grinding and engraving.

The electric main shaft unit adopts a motor built-in form, simplifies a transmission system of a main shaft, realizes zero transmission of a machine tool main shaft, ensures that the high-speed electric main shaft has the advantages of compact structure, convenient installation, good dynamic response characteristic and the like, and promotes the rapid development of the electric main shaft due to the requirement of the manufacturing industry on high-speed high-precision machining. However, the electric spindle unit has 2 obvious disadvantages, firstly, due to errors of manufacturing, assembling and the like, the rotation centers of the built-in motor stator and the rotor of the electric spindle unit are not coincident, and in the process of high-speed operation, along with the increase of the rotating speed, the electromagnetic force applied to the rotor in the radial direction is not kept balanced any more, so that unbalanced magnetic tension is generated on the surface of the rotor, meanwhile, the thermal expansion of the rotor is gradually intensified, and under the combined action of the built-in motor stator and the rotor, the rotation centers of the built-in motor stator and the rotor are further intensified to be eccentric on the basis of the original static eccentricity, so that the rotation precision of the high-speed electric spindle unit is influenced; secondly, the heat generated by the stator and the rotor of the motor and the bearings is difficult to effectively dissipate in a limited space, and the temperature of the electric main shaft unit is increased, so that the thermal elongation and the thermal deformation of the main shaft can be caused, and the processing precision is reduced.

Chinese patent application No. CN210702604U discloses a high-speed electric spindle with good heat dissipation effect, a cavity has been seted up to the inside of electric spindle body, the outside fixed mounting of cavity has the heat dissipation layer, heat dissipation layer and electric spindle body are inside to communicate with each other, be provided with the main shaft in the cavity, the outside fixed mounting of electric spindle body has the shell, the fixed surface mounting in top of electric spindle body has the bearing, bearing and heat dissipation layer are upper and lower position relation, the heat dissipation performance of electric spindle has been improved, the off-centre problem of electric spindle is not solved.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome not enough above, the utility model aims at providing a machining center machine is with high-speed high accuracy main shaft mechanism, structural design is reasonable, discern and compensate the improvement to the eccentricity of main shaft through eccentric compensation subassembly, avoid the gyration precision of eccentric influence main shaft, through setting up the cooling runner in the spiral cooling jacket cooperation casing, to preceding bearing group, back bearing group, the stator cools off the heat dissipation, the machining precision that main shaft thermal elongation and the heat altered shape that avoids main shaft mechanism temperature to rise to arouse leads to reduces, application prospect is extensive.

The technical scheme is as follows: a high-speed high-precision spindle mechanism for a machining center comprises a spindle, a built-in motor, an eccentric compensation assembly and a spiral cooling sleeve; the front bearing group and the rear bearing group are respectively arranged on the front end excircle and the rear end excircle of the main shaft, and the built-in motor is arranged between the front bearing group and the rear bearing group; the built-in motor is an asynchronous motor and consists of a rotor, a stator and a casing from inside to outside, and the rotor is assembled on the main shaft in a hot pressing mode; the eccentric compensation assembly comprises a displacement sensor group, an electromagnet group and a suspension force winding, wherein the displacement sensor group comprises a plurality of displacement sensors, the displacement sensors are uniformly arranged at the axial section positions of the front bearing group and/or the rear bearing group end, the electromagnet group comprises a plurality of electromagnets, the electromagnets are uniformly arranged at the axial section positions of the front bearing group and/or the rear bearing group end, and the suspension force winding is arranged in the stator; a spiral cooling jacket is arranged between the stator and the casing, a cooling flow channel is arranged in the casing, and the spiral cooling jacket is communicated with the cooling flow channel.

Machining center machine high-speed high accuracy main shaft mechanism, structural design is reasonable, discerns and compensates through eccentric compensation subassembly to the eccentricity of main shaft and improves, avoids eccentric centre to influence the gyration precision of main shaft, through setting up the cooling runner in the spiral cooling jacket cooperation casing, cools off the heat dissipation to preceding bearing group, back bearing group, stator, avoids the main shaft thermal elongation that the main shaft mechanism temperature risees and the machining precision that heat altered shape leads to reduce.

Wherein, the utility model discloses with built-in motor installation in the front between bearing group and the back bearing group, reduced main shaft mechanism's axial dimensions, improved main shaft mechanism's whole rigidity, be applicable to this type of application scene of the higher grinding of high rotational speed, high-power and rigidity demand.

The working principle of the eccentric compensation assembly is as follows: and the displacement sensors of the front bearing group and/or the rear bearing group detect the eccentric displacement of the main shaft and feed back the eccentric displacement data to a control system of the machining center machine, and then the control system of the machining center machine respectively controls the electromagnet group and the suspension force winding group to perform eccentric compensation on the main shaft.

Specifically, when the displacement sensors do not detect the eccentric displacement of the main shaft, the current introduced by all the electromagnets is the same, when the displacement sensors detect the eccentric displacement of the main shaft, the eccentric displacement data is fed back to the control system of the machining center machine in real time, and according to the eccentric displacement data detected by the displacement sensors, the control system of the machining center machine controls the current introduced by each electromagnet, so that all the electromagnets generate a radial electromagnetic resultant force to play a role in compensating the eccentricity of the bearing end of the main shaft.

Further, in the high-speed and high-precision spindle mechanism for the machining center machine, an outer ring of the front bearing set is fixed by a front end cover and a front end of a machine shell; the outer ring of the rear bearing group can move axially along the main shaft.

Further, foretell machining center machine is with high-speed high accuracy main shaft mechanism, the casing rear end is provided with the linear bearing assembly, the back bearing frame is equipped with to the linear bearing assembly endotheca, back bearing group sets up in the back bearing frame, back bearing frame circumference equipartition 6 springs 52 exert the pretightning force in order to the outer lane of back bearing group.

6 springs are uniformly distributed in the circumferential direction of the rear bearing seat, pretightening force can be applied to the outer ring of the rear bearing to compensate thermal elongation generated in the operation process of the main shaft, and therefore the influence of temperature on the machining precision and efficiency of the main shaft mechanism is reduced.

Further, the machining center machine uses the high-speed high-precision main shaft mechanism, the inner ring of the front bearing group and the main shaft are installed in an interference fit mode, and the axial movement of the front bearing group is limited by the front bearing lock nut 14; the inner ring of the rear bearing group is installed with the main shaft in an interference fit mode, and the rear bearing locking nut limits the axial movement of the rear bearing group.

Further, in the high-speed high-precision spindle mechanism for the machining center machine, the number of the displacement sensors of the displacement sensor group is 2 or 4, all the displacement sensors form a circular structure and are concentric with the spindle 1, and an angle formed by the adjacent 2 displacement sensors and the center of the circular structure is 180 degrees or 90 degrees; and each displacement sensor is connected with a control system of the machining center machine.

When the main shaft is concentric with the circle center, the displacement measured by the displacement sensor is zero; when the main shaft is eccentric, different displacement amounts can be measured by the displacement sensors, the eccentric displacement amount data are transmitted to a control system of the machining center machine by the displacement sensors, and the control system of the machining center machine can calculate and analyze the offset e and the eccentric direction of the main shaft and the circle center so as to calculate the unbalanced force.

Further, the machining center machine uses a high-speed high-precision spindle mechanism, and the number of the electromagnets is 6 or 12; all the electromagnets form a circular structure and are concentric with the main shaft 1, and the angle formed by the adjacent 2 electromagnets and the circle center of the circular structure is 30 degrees or 60 degrees; each electromagnet is provided with an independent circuit and is connected with a power supply.

The control system of the machining center machine calculates and analyzes the offset e and the eccentric direction of the main shaft and the circle center and the unbalanced force according to the eccentric displacement data transmitted by each displacement sensor, and then the control system of the machining center machine changes the current in each electromagnet by controlling the power supply and the independent circuit of each electromagnet, so that all the electromagnets generate a compensation force opposite to the direction of the unbalanced force, namely all the electromagnets generate a radial electromagnetic resultant force, and the effect of compensating the eccentricity of the bearing end of the main shaft is achieved.

Furthermore, foretell machining center machine is with high-speed high accuracy main shaft mechanism, the cooling runner is including cooling into runner, preceding bearing group cooling runner, spiral cooling jacket cooling advances the runner, spiral cooling jacket cooling goes out the runner, back bearing group cooling runner, cooling goes out the runner, cooling system's the pipe, cooling advances the runner, preceding bearing group cooling runner, spiral cooling jacket cooling advances the runner, spiral cooling jacket cooling goes out the runner, back bearing group cooling runner, cooling goes out the runner, cooling system's exit tube connects gradually.

Cooling system's coolant liquid is through advancing the pipe, advance the runner from the cooling that is located the main shaft rear end and flow into preceding bearing group cooling runner, cool off preceding bearing group, take away the heat that preceding bearing group produced, then flow into spiral cooling jacket cooling and advance the runner, cool off the stator, take away the heat that the stator produced, then flow into spiral cooling jacket cooling outlet flow way, back bearing group cooling runner, cool off back bearing group, the coolant liquid flows out from cooling outlet flow way at last, flow back to cooling system through the exit tube.

Further, the high-speed high-precision spindle mechanism for the machining center machine is characterized in that the cooling system comprises an oil cooler, a heat exchanger, a pressure pump and a filter, the oil cooler, the filter, the pressure pump and the inlet pipe are sequentially connected, and the outlet pipe, the heat exchanger and the oil cooler are sequentially connected.

The coolant liquid that has absorbed the heat of main shaft mechanism flows from the cooling outflow channel, reduces the temperature to ambient temperature in heat exchanger, converges into the oil cooling machine, and the coolant liquid of oil cooling machine filters the cleanness through the filter, prevents that the impurity in the coolant liquid from getting into main shaft mechanism's cooling runner and spiral cooling jacket, avoids blockking up, and the coolant liquid that the force pump will remove the impurity is carried into the pipe, is cooled into the runner, begins next cooling cycle.

The utility model has the advantages that:

(1) The high-speed high-precision spindle mechanism for the machining center machine has the advantages that the built-in motor is arranged between the front bearing group and the rear bearing group, the axial size of the spindle mechanism is reduced, the overall rigidity of the spindle mechanism is improved, and the spindle mechanism is suitable for application scenes of grinding with high rotating speed, high power and high rigidity requirement;

(2) The high-speed high-precision main shaft mechanism for the machining center machine identifies the eccentricity of the main shaft and improves the compensation through the eccentricity compensation component, so that the eccentricity is prevented from influencing the rotation precision of the main shaft;

(3) The high-speed high-precision spindle mechanism for the machining center machine is used for cooling and radiating a front bearing group, a rear bearing group and a stator by arranging a cooling runner in a spiral cooling sleeve matched shell, so that the reduction of machining precision caused by spindle thermal extension and thermal deformation due to the temperature rise of the spindle mechanism is avoided;

(4) Machining center machine high-speed high accuracy main shaft mechanism, at 6 springs of back bearing frame circumference equipartition, can apply the pretightning force to the back bearing inner race to the hot extension that produces in the compensation main shaft operation process, thereby the influence of reduce temperature to main shaft mechanism machining precision and efficiency.

Drawings

Fig. 1 is a schematic view of the overall structure of the high-speed high-precision spindle mechanism for the machining center machine of the present invention;

fig. 2 is a schematic view of the arrangement of the electromagnet eccentricity compensation on the axial section of the front bearing set and/or the rear bearing set end of the high-speed high-precision spindle mechanism for the machining center machine of the present invention;

fig. 3 is a schematic connection diagram of the spiral cooling jacket and the cooling system of the eccentric compensation assembly of the high-speed high-precision spindle mechanism for the machining center machine according to the present invention;

in the figure: the cooling structure comprises a main shaft 1, a front bearing group 11, a rear bearing group 12, a front end cover 13, a front bearing lock nut 14, a rear bearing lock nut 15, an internal motor 2, a rotor 21, a stator 22, a casing 23, a cooling flow passage 231, a cooling flow inlet passage 2311, a front bearing group cooling flow passage 2312, a spiral cooling jacket cooling flow inlet passage 2313, a spiral cooling jacket cooling flow outlet passage 2314, a rear bearing group cooling flow passage 2315, a cooling flow outlet passage 2316, an eccentric compensation assembly 3, a displacement sensor group 31, a displacement sensor 311, an electromagnet group 32, an electromagnet 321, a spiral cooling jacket 4, a linear bearing assembly 5, a rear bearing seat 51, a spring 52, a cooling system 6, an oil cooler 61, a heat exchanger 62, a pressure pump 63 and a filter 64.

Detailed Description

The invention will be further elucidated with reference to the accompanying figures 1-3 and the specific embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The high-speed and high-precision spindle mechanism for the machining center machine with the structure shown in fig. 1, 2 and 3 comprises a spindle 1, a built-in motor 2, an eccentric compensation component 3 and a spiral cooling jacket 4; a front bearing group 11 and a rear bearing group 12 are respectively arranged on the excircle of the front end and the excircle of the rear end of the main shaft 1, and the built-in motor 2 is arranged between the front bearing group 11 and the rear bearing group 12; the built-in motor 2 is an asynchronous motor and consists of a rotor 21, a stator 22 and a shell 23 from inside to outside, wherein the rotor 21 is assembled on the main shaft 1 in a hot pressing mode; the eccentric compensation assembly 3 comprises a displacement sensor group 31, an electromagnet group 32 and a suspension force winding, wherein the displacement sensor group 31 comprises a plurality of displacement sensors 311, the displacement sensors 311 are uniformly arranged at the axial section positions of the ends of the front bearing group 11 and/or the rear bearing group 12, the electromagnet group 32 comprises a plurality of electromagnets 321, the electromagnets 321 are uniformly arranged at the axial section positions of the ends of the front bearing group 11 and/or the rear bearing group 12, and the suspension force winding is arranged in the stator 22; a spiral cooling jacket 4 is arranged between the stator 22 and the casing 23, a cooling flow channel 231 is arranged in the casing 23, and the spiral cooling jacket 4 is communicated with the cooling flow channel 231.

Besides, the outer ring of the front bearing set 11 is fixed by the front end cover 13 and the front end of the casing 23; the outer ring of the rear bearing set 12 can move axially along the main shaft 1.

In addition, the rear end of the casing 23 is provided with a linear bearing assembly 5, a rear bearing seat 51 is sleeved in the linear bearing assembly 5, the rear bearing group 12 is arranged in the rear bearing seat 51, and 6 springs 52 are uniformly distributed on the rear bearing seat 51 in the circumferential direction to apply pre-tightening force to the outer ring of the rear bearing group 12.

Further, the inner ring of the front bearing set 11 is installed with the main shaft 1 in an interference fit manner, and the front bearing lock nut 14 limits the axial movement of the front bearing set 11; the inner ring of the rear bearing set 12 is installed with the main shaft 1 in an interference fit manner, and the axial movement of the rear bearing set 12 is limited by a rear bearing lock nut 15.

In addition, the number of the displacement sensors 311 of the displacement sensor group 31 is 2 or 4, all the displacement sensors 311 form a circular structure and are concentric with the main shaft 1, and the angle formed by the adjacent 2 displacement sensors 311 and the center of the circular structure is 180 ° or 90 °; each displacement sensor 311 is connected with a control system of the machining center.

Further, the number of the electromagnets 321 is 6 or 12; all the electromagnets 321 form a circular structure and are concentric with the main shaft 1, and the angle formed by the adjacent 2 electromagnets 321 and the circle center of the circular structure is 30 degrees or 60 degrees; each of the electromagnets 321 is provided with an independent circuit and is connected to a power source.

Further, the cooling flow channel 231 includes a cooling inlet flow channel 2311, a front bearing set cooling flow channel 2312, a spiral cooling jacket cooling inlet flow channel 2313, a spiral cooling jacket cooling outlet flow channel 2314, a rear bearing set cooling flow channel 2315 and a cooling outlet flow channel 2316, and an inlet pipe, the cooling inlet flow channel 2311, the front bearing set cooling flow channel 2312, the spiral cooling jacket cooling inlet flow channel 2313, the spiral cooling jacket cooling outlet flow channel 2314, the rear bearing set cooling flow channel 2315, the cooling outlet flow channel 2316 and an outlet pipe of the cooling system 6 are sequentially connected.

Further, the cooling system 6 includes an oil cooler 61, a heat exchanger 62, a pressure pump 63, and a filter 64, where the oil cooler 61, the filter 64, the pressure pump 63, and the inlet pipe are sequentially connected, and the outlet pipe, the heat exchanger 62, and the oil cooler 61 are sequentially connected.

Example 1

Based on the above structural basis, as shown in fig. 1.

Machining center machine high-speed high accuracy main shaft mechanism, structural design is reasonable, installs built-in motor 2 between front bearing group 11 and rear bearing group 12, has reduced main shaft mechanism's axial dimension, has improved main shaft mechanism's whole rigidity, is applicable to this kind of application scenes of high rotational speed, high-power and the higher grinding of rigidity demand.

The outer ring of the front bearing set 11 is fixed by the front end cover 13 and the front end of the housing 23, and the outer ring of the rear bearing set 12 is movable in the axial direction of the main shaft 1. The inner ring of the front bearing set 11 is installed with the main shaft 1 in an interference fit manner, and the axial movement of the front bearing set 11 is limited by a front bearing lock nut 14. The inner ring of the rear bearing set 12 is installed with the main shaft 1 in an interference fit manner, and the axial movement of the rear bearing set 12 is limited by a rear bearing lock nut 15.

Furthermore, the rear end of the housing 23 is provided with a linear bearing assembly 5, a rear bearing seat 51 is sleeved in the linear bearing assembly 5, the rear bearing group 12 is arranged in the rear bearing seat 51, 6 springs 52 are uniformly distributed on the rear bearing seat 51 in the circumferential direction, and pretightening force can be applied to the outer ring of the rear bearing group 12 to compensate thermal elongation generated in the operation process of the main shaft 1, so that the influence of temperature on the processing precision and efficiency of the main shaft mechanism is reduced.

Example 2

Based on the above structural basis of embodiment 1, as shown in fig. 1 and 2.

Machining center machine high-speed high accuracy main shaft mechanism, discern and compensate the improvement to the eccentricity of main shaft 1 through eccentric compensation subassembly 3, avoid eccentric influence main shaft 1's gyration precision.

The working principle of the eccentricity compensation assembly 3 is as follows: the displacement sensor 311 of the front bearing set 11 and/or the rear bearing set 12 detects the eccentric displacement of the spindle 1 and feeds back the eccentric displacement data to the control system of the machining center machine, and then the control system of the machining center machine respectively controls the electromagnet set 32 and the suspension force winding to perform eccentric compensation on the spindle 1.

Specifically, when the displacement sensor 311 does not detect the eccentric displacement of the spindle 1, the magnitudes of the currents applied to all the electromagnets 321 are the same, when the displacement sensor 311 detects the eccentric displacement of the spindle 1, the eccentric displacement data is fed back to the control system of the machining center in real time, and according to the eccentric displacement data detected by the displacement sensor 311, the control system of the machining center controls the magnitudes of the currents applied to all the electromagnets 321, so that all the electromagnets 321 generate a radial electromagnetic resultant force to compensate the eccentricity of the bearing end of the spindle 1.

Meanwhile, the control system of the machining center machine also controls the direction and the magnitude of current introduced by the suspension force winding, changes the suspension force of the rotor 21, thereby controlling the radial compensation force and the direction acting on the rotor 21, and playing a role in inhibiting the eccentric vibration of the rotor 21 (the specific principle of the control system is the same as that of the patent with the application number of CN 201721035752.7).

Example 3

Based on the above structure foundation of embodiment 2, as shown in fig. 1 and 2.

Machining center machine high-speed high accuracy main shaft mechanism, the quantity of displacement sensor 311 of displacement sensor group 31 is 2 or 4, all displacement sensor 311 constitute a circular structure and with the main shaft 1 concentric, the angle that adjacent 2 displacement sensor 311 and the centre of a circle of this circular structure constitute is 180 or 90. When the main shaft 1 is concentric with the center of the circle, the displacement measured by the displacement sensor 311 is zero; when the spindle 1 is eccentric, each displacement sensor 311 measures different displacement amounts, each displacement sensor 311 transmits the data of the eccentric displacement amounts to the control system of the machining center machine, and the control system of the machining center machine calculates and analyzes the offset e and the eccentric direction of the spindle 1 and the center of a circle, so as to calculate the unbalanced force.

Further, the number of the electromagnets 321 is 6 or 12; all the electromagnets 321 form a circular structure and are concentric with the main shaft 1, and the angle formed by the adjacent 2 electromagnets 321 and the circle center of the circular structure is 30 degrees or 60 degrees; each electromagnet 321 is provided with an independent electrical circuit and is connected to a power supply. The control system of the machining center machine calculates and analyzes the offset e and the eccentric direction of the main shaft and the circle center and the unbalanced force according to the eccentric displacement data transmitted by each displacement sensor 311, and then the control system of the machining center machine changes the current in each electromagnet 321 by controlling the power supply and the independent circuit of each electromagnet 321, so that all the electromagnets 321 generate a compensation force opposite to the unbalanced force direction, namely all the electromagnets 321 generate a radial electromagnetic resultant force, and the function of compensating the eccentricity of the bearing end of the main shaft 1 is achieved.

Example 4

Based on the above structural basis of embodiment 1, embodiment 2 or embodiment 3, as shown in fig. 1, 2 and 3.

Machining center machine high-speed high accuracy main shaft mechanism, through setting up the cooling runner 231 in the 4 cooperation casings of spiral cooling jacket, cool off the heat dissipation to fore bearing group 11, rear bearing group 12, stator 22, avoid the main shaft 1 thermal extension that the main shaft mechanism temperature risees and the machining precision that heat altered shape leads to reduce.

The cooling flow channel 231 includes a cooling inlet flow channel 2311, a front bearing assembly cooling flow channel 2312, a spiral cooling jacket cooling inlet flow channel 2313, a spiral cooling jacket cooling outlet flow channel 2314, a rear bearing assembly cooling flow channel 2315 and a cooling outlet flow channel 2316. The cooling liquid of the cooling system 6 flows into the front bearing assembly cooling flow passage 2312 from the cooling flow passage 2311 positioned at the rear end of the main shaft 1 through the inlet pipe, cools the front bearing assembly 11, takes away heat generated by the front bearing assembly 11, flows into the spiral cooling jacket cooling flow passage 2313, cools the stator 22, takes away heat generated by the stator 22, flows into the spiral cooling jacket cooling flow passage 2314 and the rear bearing assembly cooling flow passage 2315, cools the rear bearing assembly 12, flows out from the cooling flow passage 2316, and finally flows back to the cooling system 6 through the outlet pipe.

Example 5

Based on the above structural basis of embodiment 4, as shown in fig. 1, 2 and 3.

Machining center machine high-speed high accuracy main shaft mechanism, still include cooling system 6. The cooling system 6 comprises an oil cooler 61, a heat exchanger 62, a pressure pump 63 and a filter 64. The coolant absorbing the heat of the spindle mechanism flows out from the cooling outflow passage 2316, the temperature is reduced to the ambient temperature in the heat exchanger 62, the coolant is merged into the oil cooler 61, the coolant of the oil cooler 61 is filtered and cleaned by the filter 64, impurities in the coolant are prevented from entering the cooling flow passage and the spiral cooling jacket of the spindle mechanism, blockage is avoided, the pressure pump 63 conveys the coolant with impurities removed to the inlet pipe and the cooling inflow passage 2313, and the next cooling cycle is started.

It should be emphasized that, in the present invention, embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, the bearing selected by the front bearing set 11, the bearing selected by the rear bearing set 12, the rotor 21, the stator 22, the displacement sensor 311, the electromagnet 321, the levitation force winding, the oil cooler 61, the heat exchanger 62, the pressure pump 63, the filter 64, and the control system of the machining center machine, etc. are all adopted in the prior art, and the model, the specific structure, the specific installation position, and the connection mode thereof are the model, the specific structure, the specific installation position, and the connection mode known by those skilled in the art, and the structure and the principle thereof are all known by the technical manual or by the conventional experimental method, and do not affect the implementation of the technical solution of the present invention.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.

In addition, the embodiments of the present invention can be arbitrarily combined with each other, and the same shall be regarded as the disclosure of the present invention as long as the idea of the present invention is not violated.

Claims (8)

1. A high-speed high-precision spindle mechanism for a machining center is characterized by comprising a spindle (1), a built-in motor (2), an eccentric compensation component (3) and a spiral cooling sleeve (4); a front bearing group (11) and a rear bearing group (12) are respectively arranged on the excircle of the front end and the excircle of the rear end of the main shaft (1), and the built-in motor (2) is arranged between the front bearing group (11) and the rear bearing group (12); the built-in motor (2) is an asynchronous motor and consists of a rotor (21), a stator (22) and a shell (23) from inside to outside, and the rotor (21) is assembled on the main shaft (1) in a hot pressing mode; the eccentric compensation assembly (3) comprises a displacement sensor group (31), an electromagnet group (32) and a suspension force winding, wherein the displacement sensor group (31) consists of a plurality of displacement sensors (311), the displacement sensors (311) are uniformly arranged at the axial section positions of the ends of a front bearing group (11) and/or a rear bearing group (12), the electromagnet group (32) consists of a plurality of electromagnets (321), the electromagnets (321) are uniformly arranged at the axial section positions of the ends of the front bearing group (11) and/or the rear bearing group (12), and the suspension force winding is arranged in the stator (22); a spiral cooling jacket (4) is arranged between the stator (22) and the machine shell (23), a cooling flow channel (231) is arranged in the machine shell (23), and the spiral cooling jacket (4) is communicated with the cooling flow channel (231).

2. The high-speed high-precision spindle mechanism for the machining center machine according to claim 1, wherein an outer ring of the front bearing set (11) is fixed by a front end cover (13) and a front end of a machine shell (23); the outer ring of the rear bearing group (12) can move axially along the main shaft (1).

3. The high-speed and high-precision spindle mechanism for the machining center machine is characterized in that a linear bearing assembly (5) is arranged at the rear end of the machine shell (23), a rear bearing seat (51) is sleeved in the linear bearing assembly (5), the rear bearing group (12) is arranged in the rear bearing seat (51), and 6 springs (52) are uniformly distributed in the circumferential direction of the rear bearing seat (51) to apply pre-tightening force to the outer ring of the rear bearing group (12).

4. The high-speed and high-precision spindle mechanism for the machining center machine is characterized in that an inner ring of the front bearing set (11) is mounted with the spindle (1) in an interference fit mode, and the front bearing set (11) is limited in axial movement by a front bearing locking nut (14); the inner ring of the rear bearing group (12) is installed with the main shaft (1) in an interference fit mode, and the rear bearing lock nut (15) limits the axial movement of the rear bearing group (12).

5. The high-speed and high-precision spindle mechanism for the machining center machine according to claim 1, characterized in that the number of the displacement sensors (311) of the displacement sensor group (31) is 2 or 4, all the displacement sensors (311) form a circular structure and are concentric with the spindle (1), and the angle formed by the adjacent 2 displacement sensors (311) and the center of the circular structure is 180 ° or 90 °; each displacement sensor (311) is connected with a control system of the machining center machine.

6. The high-speed and high-precision spindle mechanism for the machining center machine according to claim 5, wherein the number of the electromagnets (321) is 6 or 12; all the electromagnets (321) form a circular structure and are concentric with the main shaft (1), and the angle formed by the adjacent 2 electromagnets (321) and the circle center of the circular structure is 30 degrees or 60 degrees; each electromagnet (321) is provided with an independent circuit and is connected with a power supply.

7. The high-speed high-precision spindle mechanism for the machining center machine according to claim 1, wherein the cooling flow channel (231) comprises a cooling inlet flow channel (2311), a front bearing set cooling flow channel (2312), a spiral cooling jacket cooling inlet flow channel (2313), a spiral cooling jacket cooling outlet flow channel (2314), a rear bearing set cooling flow channel (2315) and a cooling outlet flow channel (2316), and an inlet pipe, a cooling inlet flow channel (2311), a front bearing set cooling flow channel (2312), a spiral cooling jacket cooling inlet flow channel (2313), a spiral cooling jacket cooling outlet flow channel (2314), a rear bearing set cooling flow channel (2315), a cooling outlet flow channel (2316) and an outlet pipe of the cooling system (6) are sequentially connected.

8. The high-speed high-precision spindle mechanism for the machining center machine according to claim 7, wherein the cooling system (6) comprises an oil cooler (61), a heat exchanger (62), a pressure pump (63) and a filter (64), the oil cooler (61), the filter (64), the pressure pump (63) and an inlet pipe are sequentially connected, and the outlet pipe, the heat exchanger (62) and the oil cooler (61) are sequentially connected.

Images