A precision spindle hard turning apparatus

Abstract

This utility model relates to the field of precision hard turning technology, and more particularly to a precision spindle hard turning device. Its technical solution includes a housing base, a spindle assembly, a Z-axis assembly, and a center axis assembly. A protective shell is fixedly installed on the top of the housing base. An operating table is fixedly installed on one side of the front of the protective shell, and an electrical cabinet is fixedly installed on the back of the protective shell. This utility model utilizes a liquid-floating pressure-bearing groove on the inner side of the spindle bearing. When the spindle rotates at high speed, lubricating oil is injected into the spindle bearing, and continuous pressure is applied to the lubricating oil entering the spindle bearing. This causes the lubricating oil to enter the liquid-floating pressure-bearing groove and form a static pressure, creating an oil film between the spindle and the liquid-floating pressure-bearing groove. This allows the spindle to rotate while suspended within the spindle assembly. Simultaneously, the oil film on the outer side of the spindle continuously and efficiently lubricates the spindle and the spindle bearing, significantly reducing wear on the spindle and thus improving the precision of the spindle assembly.

Description

Technical Field

[0001] This utility model relates to the field of precision machine tool technology, specifically to a precision spindle hard turning device. Background Technology

[0002] Precision hard turning is a CNC machining structure mainly used for high-precision turning of metal products, thereby achieving high-precision CNC machining of metal products. In the composition of precision hard turning, the spindle assembly is mainly used for transmission, connecting the drive structure and the grinding structure, and performing fine adjustments during the grinding process to achieve high-precision micro-machining. However, the traditional precision hard turning spindle structure mainly relies on imported equipment. Therefore, in order to achieve the localization of precision hard turning spindles and improve their durability and maintenance convenience, we propose a precision spindle hard turning device.

[0003] The existing technology still has the following drawbacks in its use:

[0004] In existing precision spindle hard turning equipment, friction exists between the spindle and the spindle bearing during high-speed rotation. To reduce wear caused by this friction, grease or lubricating oil is needed to lubricate the spindle and the spindle bearing, thereby reducing the degree of uneven wear and improving the precision of the spindle during use. However, the lubrication of traditional hard turning spindles is limited, and the lubrication area is relatively small. As a result, the spindle experiences greater wear, leading to less than ideal precision during use.

[0005] In view of this, we propose a precision spindle hard turning device to solve the existing problems. Utility Model Content

[0006] The purpose of this invention is to provide a precision spindle hard turning device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a precision spindle hard turning device, comprising a housing base, a spindle assembly, a Z-axis assembly and a center axis assembly, wherein a protective shell is fixedly installed on the top of the housing base, an operating table is fixedly installed on one side of the front of the protective shell, and an electrical cabinet is fixedly installed on the back of the protective shell.

[0008] The spindle assembly is fixedly installed on the top left side of the housing base;

[0009] A center shaft assembly is fixedly installed on the top right side of the housing base;

[0010] The Z-axis assembly is fixedly mounted on the top of the housing base behind the top axis assembly.

[0011] The top of the Z-axis assembly is equipped with an X-axis assembly, and there is a 90-degree angle between the X-axis assembly and the Z-axis assembly.

[0012] The turret is mounted on the top of the X-axis assembly near the front.

[0013] Preferably, the spindle assembly includes a spindle, a chuck cylinder is mounted on the left side of the spindle, a chuck cylinder rotary joint is mounted on the left side of the chuck cylinder, and the chuck cylinder rotary joint and the chuck cylinder are connected by a snap-fit ​​connection. A three-jaw chuck is mounted on the right side of the spindle. A spindle motor is mounted on the outer side of the spindle near the chuck cylinder rotary joint. A high-resolution angle encoder is mounted on one side of the spindle motor, and a cable passing through the motor water-cooling jacket is mounted on the spindle motor. A motor water-cooling jacket is mounted on the outer side of the spindle motor, and a guide is fixedly mounted on the back of the motor water-cooling jacket. The motor water cooling jacket has several guide grooves on its inner side, and the guide grooves are connected to the guide pipe. A fixed sleeve is fixedly installed on the side of the motor water cooling jacket near the chuck cylinder rotary joint, and the fixed sleeve is in contact with the main shaft. A main shaft sleeve is fixedly installed on the side of the motor water cooling jacket away from the fixed sleeve. A groove is opened at the center of the inner side of the main shaft sleeve, and the groove is engaged with the main shaft. Two main shaft bearings are engaged on the inner side of the main shaft sleeve, and a liquid float pressure bearing groove is opened on the inner side of the main shaft bearing. A liquid injection channel is opened inside the main shaft bearing, and the liquid injection channel is connected to the liquid float pressure bearing groove.

[0014] Preferably, the Z-axis assembly includes a Z-axis guide rail base, Z-axis side guide rails are installed on both sides of the top of the Z-axis guide rail base, a Z-axis guide rail pressure plate is installed on the top of the Z-axis side guide rails, a Z-axis linear motor is installed at the center of the top of the Z-axis guide rail base, and Z-axis hydraulic valve blocks are installed on both sides of the top of the Z-axis guide rail base. A Z-axis zero-return switch is installed on one side of the Z-axis guide rail base, a Z-axis slide is installed on the top of the Z-axis linear motor, a Z-axis grating ruler is installed on the front of the Z-axis slide, and a brake is installed on the back of the Z-axis slide. Z-axis protective cavities are installed on both the left and right sides of the Z-axis guide rail base, and a Z-axis motor protective component is fixedly installed inside the Z-axis protective cavities.

[0015] Preferably, the X-axis assembly includes an X-axis guide rail base, X-axis side guide rails are installed on both sides of the top of the X-axis guide rail base, an X-axis guide rail pressure plate is installed on the top of the X-axis side guide rails, an X-axis linear motor is installed at the center of the top of the X-axis guide rail base, and X-axis hydraulic valve blocks are installed on both sides of the top of the X-axis guide rail base. An X-axis zero-return switch is installed on one side of the X-axis guide rail base, an X-axis slide is installed on the top of the X-axis linear motor, an X-axis grating ruler is installed on one side of the X-axis slide, X-axis protective cavities are installed on both the front and rear sides of the X-axis guide rail base, and an X-axis motor protective component is fixedly installed inside the X-axis protective cavities. A balance bar component is installed on the top left side of the X-axis slide, and a brake component is installed on the top right side of the X-axis slide.

[0016] Preferably, the center shaft assembly includes a center shaft slide, linear guides are mounted on both sides of the bottom of the center shaft slide, a center shaft base is slidably mounted on the bottom of the linear guides, center shaft protective cavities are mounted on the left and right sides of the center shaft base, a ball screw is rotatably mounted inside the center shaft base, the ball screw passes through the center shaft slide, a center shaft bearing is mounted on one end of the ball screw and is connected to the center shaft base, a coupling is mounted on the other end of the ball screw, a servo motor is mounted on the side of the coupling away from the ball screw and is fixedly connected to the center shaft base, a tailstock seat is fixedly mounted on the top of the center shaft slide, a bushing is fixedly mounted on the top of the tailstock seat, a live center is mounted on the left side of the bushing, a ball spline is mounted on the right side of the bushing, a fine-tuning cylinder is mounted on the right side of the ball spline and is fixedly connected to the tailstock seat.

[0017] Preferably, the spindle assembly and the center spindle assembly are installed at the same height, and the installation positions of the spindle assembly and the center spindle assembly are on the same Z-axis.

[0018] Preferably, the electrical cabinet is equipped with electrical components, a system controller, shaft drives, pneumatic and hydraulic components, an air static pressure treatment system, and an air static pressure stabilization system.

[0019] Preferably, the housing base is internally equipped with a hydraulic system and a cooling system.

[0020] Preferably, the hydraulic system includes an electric motor, a hydraulic station, a cooling and temperature control device, and a filter tank, and the hydraulic system is connected to the spindle assembly, the X-axis assembly, and the Z-axis assembly respectively.

[0021] Preferably, the cooling system is a temperature-controlled water cooling system, and the cooling system is connected to the spindle assembly, the X-axis assembly, the Z-axis assembly and the hydraulic system respectively.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This utility model provides a liquid-floating pressure-bearing groove on the inner side of the spindle bearing. When the spindle rotates at high speed, lubricating oil is injected into the spindle bearing, and pressure is continuously applied to the lubricating oil entering the spindle bearing. This causes the lubricating oil to enter the liquid-floating pressure-bearing groove and form a static pressure, creating an oil film between the spindle and the liquid-floating pressure-bearing groove. This allows the spindle to rotate while suspended in the spindle assembly. At the same time, the oil film on the outer side of the spindle continuously and efficiently lubricates the spindle and the spindle bearing, significantly reducing the wear on the spindle and thus improving the precision of the spindle assembly.

[0024] 2. This utility model injects oil into the X-axis assembly and Z-axis assembly and applies continuous pressure to the oil, so that hydrostatic pressure is formed inside the X-axis assembly and Z-axis assembly, thereby making the X-axis assembly and Z-axis assembly in a suspended state during movement to reduce friction, so as to achieve the purpose of ultra-precision hard turning machining. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a top view of the internal structure of this utility model;

[0027] Figure 3 This is a three-dimensional structural diagram of the spindle assembly of this utility model;

[0028] Figure 4 This is a three-dimensional cross-sectional view of the spindle assembly of this utility model;

[0029] Figure 5 This is a front cross-sectional view of the spindle assembly of this utility model;

[0030] Figure 6 for Figure 5 A magnified view of the structure at point A in the middle;

[0031] Figure 7 This is a top view of the X-axis assembly of this utility model;

[0032] Figure 8 This is a schematic diagram of the side cross-sectional structure of the X-axis assembly of this utility model;

[0033] Figure 9 This is a top view of the Z-axis assembly of this utility model;

[0034] Figure 10 This is a schematic diagram of the side cross-sectional structure of the Z-axis assembly of this utility model;

[0035] Figure 11 This is a top view of the top shaft assembly of this utility model;

[0036] Figure 12 This is a front cross-sectional view of the top shaft assembly of this utility model.

[0037] Figure 13 This is a side cross-sectional view of the top shaft assembly of this utility model;

[0038] Figure 14 This is a front structural diagram of the top shaft assembly of this utility model.

[0039] In the diagram: 1. Outer shell base; 101. Protective shell; 102. Operating table; 103. Electrical cabinet; 2. Spindle assembly; 201. Chuck cylinder rotary joint; 202. Chuck cylinder; 203. Fixing sleeve; 204. Motor water cooling jacket; 2041. Guide groove; 205. Spindle bearing; 2051. Liquid flotation pressure tank; 206. Spindle bushing; 207. Spindle motor; 208. Spindle; 209. Three-jaw chuck; 3. Z-axis assembly; 301. Z-axis slide; 302. Brake; 303. Z-axis motor protective component; 304. Z-axis protective bellows; 305. Z-axis guide rail base; 306. Z-axis zero-return switch; 307. Z-axis hydraulic valve block; 308. Z-axis linear motor; 309. Z-axis guide rail pressure plate; 310. Z-axis grating ruler; 311. Z 4. X-axis assembly; 401. Balance bar assembly; 402. Brake assembly; 403. X-axis slide; 404. X-axis motor protection component; 405. X-axis protective cavity; 406. X-axis guide rail base; 407. X-axis linear motor; 408. X-axis guide rail pressure plate; 409. X-axis grating ruler; 410. X-axis zero-return switch; 411. X-axis hydraulic valve block; 412. X-axis side guide rail; 5. Turret; 6. Center shaft assembly; 601. Center shaft slide; 602. Center shaft protective cavity; 603. Center shaft bearing; 604. Ball screw; 605. Coupling; 606. Servo motor; 607. Linear guide rail; 608. Live center; 609. Bushing; 610. Ball spline; 611. Fine-tuning cylinder; 612. Tailstock base. Detailed Implementation

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1 - Figure 7As shown, the present invention proposes a precision spindle hard turning equipment, including a housing base 1, a spindle assembly 2, a Z-axis assembly 3, and a center axis assembly 6. A protective shell 101 is fixedly installed on the top of the housing base 1. An operating table 102 is fixedly installed on one side of the front of the protective shell 101, and an electrical cabinet 103 is fixedly installed on the back of the protective shell 101. Both the housing base 1 and the protective shell 101 can provide installation positions for the surrounding components and protect the internal structure to avoid oil and waste splashing during processing. The operating table 102 is equipped with a CNC system, which can be connected to other electronic devices through cables to control the various components inside the device to complete automated processing. The electrical cabinet 103 can provide installation positions for electrical components and facilitate the later inspection and maintenance of electrical components.

[0042] The spindle assembly 2 is fixedly installed on the top left side of the housing base 1. The spindle assembly 2 can utilize the friction force during the hydrostatic compression of the liquid to achieve ultra-precision hard turning machining in conjunction with other electronic components.

[0043] A center spindle assembly 6 is fixedly installed on the top right side of the housing base 1. The center spindle assembly 6 can cooperate with the spindle assembly 2 to realize automated ultra-precision turning of the component to be processed.

[0044] The Z-axis assembly 3 is fixedly installed on the top of the housing base 1 behind the center axis assembly 6. The Z-axis assembly 3 can reduce the friction force during operation based on the principle of hydrostatic pressure, thereby facilitating high-precision position adjustment of the X-axis assembly 4 and its top components.

[0045] The top of the Z-axis assembly 3 is equipped with the X-axis assembly 4, and there is a 90-degree angle between the X-axis assembly 4 and the Z-axis assembly 3. The X-axis assembly 4 can perform high-precision position adjustment of the top-mounted turret 5 in the X-axis direction based on the principle of hydrostatic pressure, so as to improve the overall turning accuracy of the device for the workpiece.

[0046] The turret 5 is mounted on the top of the X-axis assembly 4 near the front. The turret 5 can mount and quickly change tools to perform turning operations on the workpiece.

[0047] Furthermore, the spindle assembly 2 includes a spindle 208. A chuck cylinder 202 is mounted on the left side of the spindle 208, and a chuck cylinder rotary joint 201 is mounted on the left side of the chuck cylinder 202. The chuck cylinder rotary joint 201 and the chuck cylinder 202 are connected by a snap-fit ​​connection. A three-jaw chuck 209 is mounted on the right side of the spindle 208. A spindle motor 207 is mounted on the outer side of the spindle 208 near the chuck cylinder rotary joint 201. The spindle motor 207 is an ES929 type. A high-resolution angle encoder is mounted on one side of the spindle motor 207, and a cable passing through the motor water-cooling jacket 204 is mounted on the spindle motor 207. A motor water-cooling jacket 204 is mounted on the outer side of the spindle motor 207. A guide tube is fixedly mounted on the back of the motor water-cooling jacket 204. Several guide grooves 2041 are opened on the inner side of the motor water-cooling jacket 204, and the guide grooves 2041 are connected to the guide tube. A fixing sleeve 203 is fixedly installed on the side of the water-cooling jacket 204 near the chuck 201, and the fixing sleeve 203 is in contact with the spindle 208. A spindle sleeve 206 is fixedly installed on the side of the motor water-cooling jacket 204 away from the fixing sleeve 203. A groove is provided at the center of the inner side of the spindle sleeve 206, and the groove is engaged with the spindle 208. Two spindle bearings 205 are engaged on the inner side of the spindle sleeve 206, and a liquid float pressure groove 2051 is provided on the inner side of the spindle bearing 205. A liquid injection channel is provided inside the spindle bearing 205, and the liquid injection channel is connected to the liquid float pressure groove 2051. The spindle assembly 2 is connected to the hydraulic system, so that an oil film is formed on the outside of the spindle 208, and pressure is continuously applied to the oil film, so that the spindle 208 rotates in a suspended state in the oil film, which greatly reduces the friction force on the spindle 208 when rotating, so as to facilitate the device to perform high-precision turning of the workpiece to be processed.

[0048] Furthermore, the Z-axis assembly 3 includes a Z-axis guide rail base 305, Z-axis side guide rails 311 mounted on both sides of the top of the Z-axis guide rail base 305, a Z-axis guide rail pressure plate 309 mounted on the top of the Z-axis side guide rails 311, a Z-axis linear motor 308 mounted at the center of the top of the Z-axis guide rail base 305, the Z-axis linear motor 308 being of type EGC-80-TB-KF, and Z-axis hydraulic valve blocks 307 mounted on both sides of the top of the Z-axis guide rail base 305, a Z-axis zero-return switch 306 mounted on one side of the Z-axis guide rail base 305, and a [missing information - likely a device or component] mounted on the top of the Z-axis linear motor 308. Z-axis slide 301, with Z-axis grating ruler 310 mounted on the front and brake 302 mounted on the back. Z-axis guide rail base 305 has Z-axis protective cavities 304 mounted on both sides, and Z-axis motor protection component 303 is fixedly mounted on the inner side of Z-axis protective cavities 304. Z-axis assembly 3 can drive X-axis assembly 4 to move in the Z-axis direction. By connecting Z-axis assembly 3 to hydraulic system, the frictional resistance experienced by Z-axis assembly 3 during operation is reduced under the action of hydrostatic pressure, so as to facilitate high-precision position adjustment of X-axis assembly 4.

[0049] Furthermore, the X-axis assembly 4 includes an X-axis guide rail base 406, with X-axis side guide rails 412 mounted on both sides of the top of the X-axis guide rail base 406, an X-axis guide rail pressure plate 408 mounted on the top of the X-axis side guide rails 412, an X-axis linear motor 407 (EGC-80-TB-KF type) mounted at the center of the top of the X-axis guide rail base 406, and X-axis hydraulic valve blocks 411 mounted on both sides of the top of the X-axis guide rail base 406. An X-axis zero-return switch 410 is mounted on one side of the X-axis guide rail base 406, and an X-axis slide 403 is mounted on the top of the X-axis linear motor 407. An X-axis grating ruler 409 is installed on one side of the X-axis slide plate 403. X-axis protective bellows 405 are installed on both the front and rear sides of the X-axis guide rail base 406. An X-axis motor protection component 404 is fixedly installed inside the X-axis protective bellows 405. A balance bar component 401 is installed on the top left side of the X-axis slide plate 403, and a brake component 402 is installed on the top right side of the X-axis slide plate 403. After the X-axis assembly 4 can be connected to the hydraulic system, the X-axis assembly 4 can be moved back and forth under the action of hydrostatic pressure through the hydraulic system, thereby driving the turret 5 to move with high precision in the X-axis direction, which facilitates the high-precision adjustment of the position of the turret 5.

[0050] Furthermore, the center shaft assembly 6 includes a center shaft slide 601. Linear guides 607 are mounted on both sides of the bottom of the center shaft slide 601. A center shaft base is slidably mounted on the bottom of the linear guides 607. Center shaft protective cavities 602 are mounted on the left and right sides of the center shaft base. A ball screw 604 is rotatably mounted inside the center shaft base, passing through the center shaft slide 601. A center shaft bearing 603 is mounted on one end of the ball screw 604 and is connected to the center shaft base. A coupling 605 is mounted on the other end of the ball screw 604. A servo motor 606 is mounted on the side of the coupling 605 away from the ball screw 604 and is fixedly connected to the center shaft base. The center shaft slide 601... A tailstock seat 612 is fixedly mounted on the top, and a bushing 609 is fixedly mounted on the top of the tailstock seat 612. A live center 608 is mounted on the left side of the bushing 609, and a ball spline 610 is mounted on the right side of the bushing 609. A fine-tuning cylinder 611 is mounted on the right side of the ball spline 610, and the fine-tuning cylinder 611 is fixedly connected to the tailstock seat 612. The servo motor 606 is of type 130ZFMA1-0003CBNM, and the fine-tuning cylinder 611 is of type CQ2B. The position of the live center 608 is adjusted by the center shaft assembly 6, so that after the live center 608 moves to the designated position, it cooperates with the spindle assembly 2 to limit and fix the workpiece. Then, the workpiece is turned by the turret 5, realizing the automated high-precision turning of the device.

[0051] Furthermore, the spindle assembly 2 and the center spindle assembly 6 are installed at the same height, and their installation positions are on the same Z-axis.

[0052] Furthermore, the electrical cabinet 103 is equipped with electrical components, system controllers, shaft drives, pneumatic and hydraulic components, an air static pressure treatment system, and an air static pressure stabilization system.

[0053] Furthermore, a hydraulic system and a cooling system are installed inside the housing base 1.

[0054] Furthermore, the hydraulic system includes an electric motor, a hydraulic station, a cooling and temperature control device, and a filter tank, and the hydraulic system is connected to the spindle assembly 2, the X-axis assembly 4, and the Z-axis assembly 3, respectively.

[0055] Furthermore, the cooling system is a temperature-controlled water-cooling system, and the cooling system is connected to the spindle assembly 2, the X-axis assembly 4, the Z-axis assembly 3 and the hydraulic system respectively.

[0056] Working principle: The workpiece to be machined is clamped between the spindle assembly 2 and the live center 608. The hydraulic system provides lubricating oil to the X-axis assembly 4, Z-axis assembly 3, and spindle assembly 2, and continuously applies pressure to the lubricating oil inside the X-axis assembly 4, Z-axis assembly 3, and spindle assembly 2, creating hydrostatic pressure inside them. The spindle assembly 2 drives the workpiece to rotate at high speed, while the X-axis assembly 4 and Z-axis drive the turret 5 to perform high-precision positioning adjustment, bringing the turret 5 into contact with the workpiece for ultra-precision hard turning. After machining, the position of the live center 608 is adjusted to separate the workpiece from the spindle assembly 2 and the live center 608, and the machined workpiece is removed, thus completing the entire ultra-precision hard turning process.

[0057] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A precision spindle hard turning device, comprising a housing base (1), a spindle assembly (2), a Z-axis assembly (3), and a center axis assembly (6), characterized in that: A protective shell (101) is fixedly installed on the top of the outer shell base (1), an operating table (102) is fixedly installed on one side of the front of the protective shell (101), and an electrical cabinet (103) is fixedly installed on the back of the protective shell (101). The spindle assembly (2) is fixedly installed on the top left side of the housing base (1); A top shaft assembly (6) is fixedly installed on the top right side of the housing base (1). The Z-axis assembly (3) is fixedly installed on the top of the housing base (1) behind the top axis assembly (6). The top of the Z-axis assembly (3) is equipped with an X-axis assembly (4), and there is a 90-degree angle between the X-axis assembly (4) and the Z-axis assembly (3). The turret (5) is mounted on the top of the X-axis assembly (4) near the front.

2. The precision spindle hard turning equipment according to claim 1, characterized in that: The spindle assembly (2) includes a spindle (208). A chuck cylinder (202) is mounted on the left side of the spindle (208). A chuck cylinder rotary joint (201) is mounted on the left side of the chuck cylinder (202), and the chuck cylinder rotary joint (201) and the chuck cylinder (202) are connected by a snap-fit ​​connection. A three-jaw chuck (209) is mounted on the right side of the spindle (208). A spindle motor (207) is mounted on the outer side of the spindle (208) near the chuck cylinder rotary joint (201). A high-resolution angle encoder is mounted on one side of the spindle motor (207), and a cable passing through a motor water-cooling jacket (204) is mounted on the spindle motor (207). A motor water-cooling jacket (204) is mounted on the outer side of the spindle motor (207), and a guide tube is fixedly mounted on the back of the motor water-cooling jacket (204). The inner side of the motor water-cooling jacket (204) is provided with several guide grooves (2041), and the guide grooves (2041) are connected to the guide pipe. A fixing sleeve (203) is fixedly installed on the side of the motor water-cooling jacket (204) near the chuck cylinder rotary joint (201), and the fixing sleeve (203) is in contact with the main shaft (208). A main shaft bushing is fixedly installed on the side of the motor water-cooling jacket (204) away from the fixing sleeve (203). 206), a groove is provided at the center of the inner side of the main shaft sleeve (206), and the groove is engaged with the main shaft (208). Two main shaft bearings (205) are installed on the inner side of the main shaft sleeve (206), and a liquid float pressure groove (2051) is provided on the inner side of the main shaft bearing (205). A liquid injection channel is provided inside the main shaft bearing (205), and the liquid injection channel is connected to the liquid float pressure groove (2051).

3. The precision spindle hard turning equipment according to claim 1, characterized in that: The Z-axis assembly (3) includes a Z-axis guide rail base (305), with Z-axis side guide rails (311) mounted on both sides of the top of the Z-axis guide rail base (305). A Z-axis guide rail pressure plate (309) is mounted on the top of the Z-axis side guide rails (311). A Z-axis linear motor (308) is mounted at the center of the top of the Z-axis guide rail base (305), and Z-axis hydraulic valve blocks (307) are mounted on both sides of the top of the Z-axis guide rail base (305). A Z-axis zero-return switch (306) is installed on one side of the Z-axis linear motor (308). A Z-axis slide (301) is installed on the top of the Z-axis linear motor (308). A Z-axis grating ruler (310) is installed on the front of the Z-axis slide (301), and a brake (302) is installed on the back of the Z-axis slide (301). Z-axis protective cavities (304) are installed on both the left and right sides of the Z-axis guide rail base (305), and a Z-axis motor protective component (303) is fixedly installed on the inner side of the Z-axis protective cavities (304).

4. The precision spindle hard turning equipment according to claim 1, characterized in that: The X-axis assembly (4) includes an X-axis guide rail base (406), with X-axis side guide rails (412) mounted on both sides of the top of the X-axis guide rail base (406). An X-axis guide rail pressure plate (408) is mounted on the top of the X-axis side guide rails (412). An X-axis linear motor (407) is mounted at the center of the top of the X-axis guide rail base (406), and X-axis hydraulic valve blocks (411) are mounted on both sides of the top of the X-axis guide rail base (406). An X-axis zero-return switch (410) is mounted on one side of the X-axis guide rail base (406). The X-axis linear motor (407) is equipped with an X-axis slide plate (403) on its top. An X-axis grating ruler (409) is installed on one side of the X-axis slide plate (403). X-axis protective cavities (405) are installed on both the front and rear sides of the X-axis guide rail base (406). An X-axis motor protection component (404) is fixedly installed on the inner side of the X-axis protective cavities (405). A balance bar component (401) is installed on the top left side of the X-axis slide plate (403), and a brake component (402) is installed on the top right side of the X-axis slide plate (403).

5. The precision spindle hard turning equipment according to claim 1, characterized in that: The center shaft assembly (6) includes a center shaft slide (601), with linear guides (607) mounted on both sides of the bottom of the center shaft slide (601). A center shaft base is slidably mounted on the bottom of the linear guides (607). Center shaft protective cavities (602) are mounted on the left and right sides of the center shaft base. A ball screw (604) is rotatably mounted inside the center shaft base. The ball screw (604) passes through the center shaft slide (601). A center shaft bearing (603) is mounted on one end of the ball screw (604) and is connected to the center shaft base. The other end of the ball screw (604) is mounted with... A coupling (605) is provided, on the side of the coupling (605) away from the ball screw (604) a servo motor (606) is installed, and the servo motor (606) is fixedly connected to the center shaft base. A tailstock seat (612) is fixedly installed on the top of the center shaft slide (601), and a bushing (609) is fixedly installed on the top of the tailstock seat (612). A live center (608) is installed on the left side of the bushing (609), and a ball spline (610) is installed on the right side of the bushing (609). A fine-tuning cylinder (611) is installed on the right side of the ball spline (610), and the fine-tuning cylinder (611) is fixedly connected to the tailstock seat (612).

6. The precision spindle hard turning equipment according to claim 1, characterized in that: The main spindle assembly (2) and the tip spindle assembly (6) are installed at the same height, and the main spindle assembly (2) and the tip spindle assembly (6) are installed on the same Z-axis.

7. A precision spindle hard turning device according to claim 1, characterized in that: The electrical cabinet (103) is equipped with electrical components, system controller, shaft drives, pneumatic and hydraulic components, air static pressure treatment system, and air static pressure stabilization system.

8. The precision spindle hard turning equipment according to claim 1, characterized in that: The housing base (1) is equipped with a hydraulic system and a cooling system.

9. A precision spindle hard turning device according to claim 8, characterized in that: The hydraulic system includes an electric motor, a hydraulic station, a cooling and temperature control device, and a filter tank, and is connected to the spindle assembly (2), the X-axis assembly (4), and the Z-axis assembly (3), respectively.

10. A precision spindle hard turning device according to claim 8, characterized in that: The cooling system is a temperature-controlled water cooling system, and the cooling system is connected to the spindle assembly (2), the X-axis assembly (4), the Z-axis assembly (3) and the hydraulic system respectively.

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