High-rigidity numerical control machine tool spindle

Abstract

The utility model discloses a high rigidity numerical control machine tool spindle, including spindle, spindle box, front bearing, rear bearing, front bearing seat, rear bearing seat, motor and hit sword cylinder unit, and the front bearing seat is connected through screw centering in the front end of spindle box, and the radial convex ring of the rear end integral setting of stator sleeve is connected through screw centering in the rear end of spindle box, and the rear bearing seat is connected through screw centering in the rear end of radial convex ring, and the cooling structure of the outside setting of front bearing includes heat -proof ring and circulating cooling circuit, and heat -proof ring is connected through screw centering in the rear side of front bearing seat, and circulating cooling circuit includes the first through hole, first cooling ring groove, second through hole, a plurality of second cooling ring groove and third through hole in proper order, and the water inlet and water outlet are seted up in the spindle box. The utility model has improved the rigidity of spindle greatly, and controls the temperature rise of front bearing and spindle, makes spindle still can keep higher rigidity and stability under complex working condition, ensures the part machining precision and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically to a high-rigidity CNC machine tool spindle. Background Technology

[0002] The spindle, as a crucial functional component of CNC machine tools, plays a key role in parts machining. High-rigidity spindles, representing high-speed, high-performance spindles, have become a critical configuration for high-end CNC machine tools. However, the current high-rigidity spindle market in my country is still dominated by imported products, with relatively insufficient domestic production capacity. Existing high-rigidity spindles, designed to meet structural rigidity requirements, often simplify the bearing cooling structure. However, the high-speed rotating motor generates a large amount of heat, leading to high temperature rise in the spindle and bearings, reduced service life, and impacting spindle rigidity and operational stability, ultimately affecting parts machining efficiency. These problems urgently need to be addressed through technological innovation and structural optimization. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-rigidity CNC machine tool spindle that can maintain high rigidity and stability under complex working conditions, ensure the machining accuracy and efficiency of parts, and improve the service life of the spindle and front bearing.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a high-rigidity CNC machine tool spindle, including a spindle, a spindle box, a front bearing, a rear bearing, a front bearing housing, a rear bearing housing, a motor, and a tool-clamping cylinder unit. The front bearing and the rear bearing are respectively interference-fitted and installed on the front and rear sections of the spindle. The front bearing housing and the rear bearing housing are respectively installed on the outer sides of the front and rear bearings. The motor includes a stator, a rotor, and a stator sleeve. The rotor is interference-fitted and connected to the outer side of the middle section of the spindle. The stator sleeve is interference-fitted and connected to the outer side of the stator. The tool-clamping cylinder unit is located on the rear side of the spindle and is used to realize the tool clamping and releasing function of the spindle. The front bearing housing is centered and connected to the front end of the spindle box by screws. A radial convex ring is integrally provided on the rear end of the stator sleeve. The radial convex ring is centered and connected to the rear end of the spindle box by screws. The rear bearing housing... The radial convex ring is centered and connected to the rear end of the front bearing by screws. A cooling structure is provided on the outer side of the front bearing. The cooling structure includes a heat insulation ring and a circulating cooling circuit. The heat insulation ring is centered and connected to the rear side of the front bearing housing by screws. The heat insulation ring is located between the rear side of the front bearing and the front side of the stator. The circulating cooling circuit includes a first through hole, a first cooling ring groove, a second through hole, several second cooling ring grooves, and a third through hole that are connected in sequence. The first cooling ring groove is formed on the outer wall of the heat insulation ring. The first through hole, the second through hole, several second cooling ring grooves, and the third through hole are respectively located in the front bearing housing. The several second cooling ring grooves are arranged side by side along the axial direction of the front bearing housing and are connected in sequence. A water inlet hole and a water outlet hole are provided in the spindle box. The water inlet hole is connected to the external cooling water supply mechanism and the first through hole, respectively. The water outlet hole is connected to the third through hole.

[0005] This invention integrates the front bearing housing, rear bearing housing, stator sleeve, and spindle box into one unit, achieving an integrated design of the spindle and spindle box. This significantly improves the rigidity of the spindle. Combined with a specific cooling structure, it can effectively absorb the heat from the front bearing and spindle, control the temperature rise of the front bearing and spindle, and enable the spindle to maintain high rigidity and stability under complex working conditions. This ensures the machining accuracy and efficiency of parts and improves the service life of the spindle and front bearing.

[0006] During spindle operation, the motor generates a significant amount of heat. Cooling water from the external cooling water supply system enters the first through-hole through the inlet, then the first cooling ring groove, and subsequently passes through the second through-hole into several second cooling ring grooves. Finally, it exits through the third through-hole into the outlet for recycling. The heat insulation ring effectively blocks and absorbs the heat generated by the stator during spindle operation, greatly alleviating the temperature rise problem of the spindle bearings and ensuring adequate cooling for the front bearing and spindle. Furthermore, the design of the first through-hole, first cooling ring groove, second through-hole, several second cooling ring grooves, and third through-hole, combined with the inlet and outlet holes, saves space while improving cooling efficiency, ensuring high-efficiency spindle operation.

[0007] Preferably, the front bearing comprises two double-row cylindrical roller bearings and one thrust angular contact ball bearing. One of the double-row cylindrical roller bearings and the thrust angular contact ball bearing are clearance-fitted and positioned inside the front section of the front bearing housing, while the other double-row cylindrical roller bearing is clearance-fitted and positioned inside the rear section of the front bearing housing. This combination of front bearings further enhances the rigidity of the spindle, ensuring that the spindle maintains high rigidity even under high-speed operating conditions, effectively suppressing vibrations generated during high-speed spindle operation, and making the spindle's working state more stable during high-speed operation.

[0008] Preferably, the plurality of second cooling ring grooves are formed on the outer surface of the front bearing housing, and the radially outer sides of the plurality of second cooling ring grooves are sealed by water jackets. Adjacent second cooling ring grooves are connected by axial flow channels. This design of the plurality of second cooling ring grooves improves the heat dissipation efficiency of the cooling structure and further enhances the cooling effect on the front bearing.

[0009] Preferably, a cooling sleeve is provided on the inner side of the rear bearing housing for centering and positioning. The cooling sleeve is located near the front side of the rear bearing and is connected to an external cooling water supply mechanism. The function of the cooling sleeve is to cool the rear bearing, further control the temperature rise of the spindle, and thus achieve higher spindle rigidity.

[0010] Preferably, the upper side wall of the spindle box is provided with several functional interface outlets. Concentrating the outlets of the functional interfaces on the upper side wall of the spindle box facilitates wiring during the installation and assembly of the spindle and its supporting components, improves wiring efficiency, and facilitates subsequent maintenance.

[0011] Preferably, the gap between the heat insulation ring and the stator is 0.8–1.5 mm. This small gap of 0.8–1.5 mm ensures effective heat insulation and cooling, promptly removes heat, and maintains the compactness of the overall spindle structure.

[0012] Compared with the prior art, the present invention has the following advantages: The present invention integrates the front bearing housing, the rear bearing housing, the stator sleeve and the spindle box into one unit, realizing the integrated design of the spindle and the spindle box, which greatly improves the rigidity of the spindle. At the same time, combined with a specific cooling structure, it can effectively absorb the heat of the front bearing and the spindle, control the temperature rise of the front bearing and the spindle, so that the spindle can maintain high rigidity and stability under complex working conditions, ensure the machining accuracy and efficiency of parts, and improve the service life of the spindle and the front bearing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a half-section of the high-rigidity CNC machine tool spindle in the embodiment;

[0014] Figure 2 This is a partial cross-sectional structural diagram of the high-rigidity CNC machine tool spindle in the embodiment;

[0015] Figure 3 A schematic diagram of the full cross-section of the front section of the high-rigidity CNC machine tool spindle in the embodiment after removing the spindle box. Figure 1 ;

[0016] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0017] Figure 5 A schematic diagram of the full cross-section of the front section of the high-rigidity CNC machine tool spindle in the embodiment after removing the spindle box. Figure 2 ;

[0018] Figure 6 This is a partial perspective view of the spindle box in the embodiment;

[0019] Figures 1-6 The specific reference numerals in the attached figures are as follows:

[0020] 1-Spindle, 2-Spindle box, 21-Outlet end, 22-Water outlet, 31-Front bearing housing, 32-Double row cylindrical roller bearing, 33-Thrust angular contact ball bearing, 41-Rear bearing housing, 42-Rear bearing, 43-Cooling jacket, 51-Stator, 52-Rotor, 53-Stator sleeve, 54-Radial convex ring, 6-Tool-changing cylinder unit, 7-Heat insulation ring, 81-First through hole, 82-First cooling ring groove, 83-Second through hole, 84-Second cooling ring groove, 85-Third through hole, 86-Water jacket, 87-Axial flow channel. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Structures or components not limited in this invention employ conventional techniques in the art.

[0022] Example: A high-rigidity CNC machine tool spindle, such as Figures 1-6As shown, the assembly includes a spindle 1, a spindle housing 2, a front bearing, a rear bearing 42, a front bearing housing 31, a rear bearing housing 41, a motor, and a tool-changing cylinder unit 6. The front bearing and rear bearing 42 are respectively interference-fitted and installed at the front and rear sections of the spindle 1. The front bearing housing 31 and rear bearing housing 41 are respectively installed on the outer sides of the front bearing and rear bearing 42. The motor includes a stator 51, a rotor 52, and a stator sleeve 53. The rotor 52 is interference-fitted and connected to the outer side of the middle section of the spindle 1, and the stator sleeve 53 is interference-fitted and connected to the outer side of the stator 51. The tool-changing cylinder... Unit 6 is located on the rear side of spindle 1. The tool clamping cylinder unit 6 is used to realize the tool clamping function of spindle 1. The upper side wall of spindle box 2 is provided with several function interface outlets 21. The front bearing housing 31 is centered and connected to the front end of spindle box by screws. The rear end of stator sleeve 53 is integrally provided with a radial convex ring 54, which is centered and connected to the rear end of spindle box by screws. The rear bearing housing 41 is centered and connected to the rear end of radial convex ring 54 by screws. The outer side of the front bearing is provided with a cooling structure, which includes a heat insulation ring 7 and a circulation system. The cooling circuit has a 1.0mm gap between the heat insulation ring 7 and the stator 51. The heat insulation ring 7 is centered and connected to the rear side of the front bearing housing 31 by screws. The heat insulation ring 7 is located between the rear side of the front bearing and the front side of the stator 51. The circulating cooling circuit includes a first through hole 81, a first cooling ring groove 82, a second through hole 83, several second cooling ring grooves 84 and a third through hole 85 that are connected in sequence. The first cooling ring groove 82 is formed on the outer wall of the heat insulation ring 7. The first through hole 81, the second through hole 83, and the several second cooling ring grooves 84 are connected in sequence. 4 and the third through hole 85 are respectively provided in the front bearing housing 31. Several second cooling ring grooves 84 are arranged side by side along the axial direction of the front bearing housing 31 and are connected in sequence. The spindle box 2 is provided with a water inlet hole (not shown in the figure) and a water outlet hole 22. The water inlet hole is connected to the external cooling water supply mechanism and the first through hole 81 respectively. The water outlet hole 22 is connected to the third through hole 85. A cooling sleeve 43 is provided on the inner side of the rear bearing housing 41 for centering and fitting. The cooling sleeve 43 is close to the front side of the rear bearing 42 and is connected to the external cooling water supply mechanism. Figure 3 and Figure 5 The diagram shows the internal structure of the front section of a high-rigidity CNC machine tool spindle at different cutting positions after the spindle box is removed.

[0023] In this embodiment, the front bearing includes two double-row cylindrical roller bearings 32 and a thrust angular contact ball bearing 33. One double-row cylindrical roller bearing 32 and the thrust angular contact ball bearing 33 are positioned with clearance fit on the inner side of the front section of the front bearing housing 31, and the other double-row cylindrical roller bearing 32 is positioned with clearance fit on the inner side of the rear section of the front bearing housing 31.

[0024] In this embodiment, a plurality of second cooling ring grooves 84 are formed on the outer surface of the front bearing housing 31, and the radial outer sides of the plurality of second cooling ring grooves 84 are sealed by water jackets 86, and two adjacent second cooling ring grooves 84 are connected by an axial flow channel 87.

[0025] During the operation of the spindle 1, the motor generates a large amount of heat. Cooling water from the external cooling water supply mechanism enters the first through hole 81 through the inlet hole, then enters the first cooling ring groove 82, then enters several second cooling ring grooves 84 through the second through hole 83, and finally exits into the outlet hole 22 through the third through hole 85 for recycling. The heat insulation ring 7 can effectively block and absorb the heat generated by the stator 51 during the operation of the spindle 1, greatly solving the temperature rise problem of the spindle 1 bearing and ensuring sufficient cooling of the front bearing and the spindle 1. Based on the sufficient cooling of the front bearing and the spindle 1, due to the integrated design of the spindle 1 and the spindle box 2, and the combination design of two double-row cylindrical roller bearings 32 and one thrust angular contact ball bearing 33 in the front bearing, the high rigidity of the spindle 1 is finally achieved. This allows the spindle 1 to maintain high rigidity under complex and high-speed operating conditions, thereby achieving high stability, high precision and high efficiency in parts machining, and significantly extending the service life of the spindle 1 and the front bearing.

Claims

1. A high-rigidity CNC machine tool spindle, comprising a spindle, a spindle housing, a front bearing, a rear bearing, a front bearing housing, a rear bearing housing, a motor, and a tool-clamping cylinder unit, wherein the front bearing and the rear bearing are respectively interference-fitted and mounted on the front and rear sections of the spindle, and the front bearing housing and the rear bearing housing are respectively mounted on the outer sides of the front and rear bearings, the motor comprises a stator, a rotor, and a stator sleeve, the rotor is interference-fitted and connected to the outer side of the middle section of the spindle, the stator sleeve is interference-fitted and connected to the outer side of the stator, and the tool-clamping cylinder unit is disposed on the rear side of the spindle, the tool-clamping cylinder unit being used to realize the tool-clamping function of the spindle, characterized in that: The front bearing housing is centered and connected to the front end of the spindle box by screws. A radial convex ring is integrally formed at the rear end of the stator sleeve, and this radial convex ring is centered and connected to the rear end of the spindle box by screws. The rear bearing housing is centered and connected to the rear end of the radial convex ring by screws. A cooling structure is provided on the outer side of the front bearing. The cooling structure includes a heat insulation ring and a circulating cooling circuit. The heat insulation ring is centered and connected to the rear side of the front bearing housing by screws, and is located between the rear side of the front bearing and the front side of the stator. The circulating cooling circuit includes sequentially... The device comprises a first through hole, a first cooling ring groove, a second through hole, several second cooling ring grooves, and a third through hole. The first cooling ring groove is formed on the outer wall of the heat insulation ring. The first through hole, the second through hole, several second cooling ring grooves, and the third through hole are respectively located in the front bearing housing. The several second cooling ring grooves are arranged side by side along the axial direction of the front bearing housing and are connected sequentially. The spindle box is provided with a water inlet and a water outlet. The water inlet is connected to the external cooling water supply mechanism and the first through hole, respectively. The water outlet is connected to the third through hole.

2. The high-rigidity CNC machine tool spindle according to claim 1, characterized in that: The front bearing includes two double-row cylindrical roller bearings and one thrust angular contact ball bearing. One of the double-row cylindrical roller bearings and the thrust angular contact ball bearing are positioned with clearance fit on the inner side of the front section of the front bearing housing, and the other double-row cylindrical roller bearing is positioned with clearance fit on the inner side of the rear section of the front bearing housing.

3. The high-rigidity CNC machine tool spindle according to claim 1, characterized in that: The plurality of second cooling ring grooves are formed on the outer surface of the front bearing housing, and the radial outer sides of the plurality of second cooling ring grooves are sealed by water jackets. Adjacent second cooling ring grooves are connected by axial flow channels.

4. The high-rigidity CNC machine tool spindle according to claim 1, characterized in that: A cooling sleeve is provided on the inner side of the rear bearing housing for centering and fitting. The cooling sleeve is close to the front side of the rear bearing and is connected to an external cooling water supply mechanism.

5. The high-rigidity CNC machine tool spindle according to claim 1, characterized in that: The upper side wall of the spindle box is provided with several functional interface outlets.

6. The high-rigidity CNC machine tool spindle according to claim 1, characterized in that: The gap between the heat insulation ring and the stator is 0.8 to 1.5 mm.

Images