Dynamic pressure spindle unit dynamic pressure oil wedge profile precision machining clamp

Abstract

The present application relates to a kind of dynamic pressure oil wedge profile precision machining clamps of dynamic pressure spindle unit, including V-shaped adjusting device and pressing device, pressing device is located in the upper of V-shaped adjusting device, dynamic pressure spindle unit positioning clamping between them, wherein, the lower of the plane of both sides of the V-shaped notch of V-shaped adjusting device is respectively provided with one inclined plane micro-displacement adjusting mechanism, the outer side of inclined plane micro-displacement adjusting mechanism is equipped with adjusting pad, and the left and right sides of adjusting pad are equipped with pre-tightening device. The transformation of the normal motion that the axial motion input by inclined plane micro-displacement adjusting mechanism is exported to adjusting pad along the plane of both sides of the V-shaped notch of V-shaped adjusting device and the cooperation of two inclined plane micro-displacement adjusting mechanisms, so that the adjustment of the arc center of dynamic pressure oil wedge profile of dynamic pressure spindle unit from not coinciding with the center line of headstock center to coinciding meets the kinematic requirement of internal circular grinding.The present application is simple in structure, and convenient to adjust, can satisfy the precision machining demand of dynamic pressure oil wedge profile of dynamic pressure spindle unit.

Description

Technical Field

[0001] This invention relates to a machine tool machining fixture, and more particularly to a fixture for precision machining of the hydrodynamic wedge profile of a hydrostatic spindle unit. Background Technology

[0002] For sliding bearings lubricated with lubricating oil, the ideal state of fluid friction is achieved. Hydrostatic bearings, which utilize a hydraulic system to force pressurized lubricating oil into the gap between the journal and the bearing, are sliding bearings that support loads under hydrostatic pressure. Their advantage lies in operating under pure fluid friction. Hydrostatic-hydrodynamic bearings are a type of sliding bearing developed from hydrodynamic and hydrostatic bearings, effectively utilizing the combined effects of both. The hydrostatic forming surface of hydrodynamic sliding bearings can have various profiles, including stepped surfaces, Archimedean spiral surfaces, and eccentric circular arc surfaces, as long as the structure contains a converging hydrostatic wedge.

[0003] Figure 1 This is a schematic diagram of a multi-oil wedge dynamic pressure profile structure for a hydrostatic bearing, consisting of an axial oil sealing edge 11, a dynamic pressure cavity profile 12, and a static pressure cavity 13. The dynamic pressure cavity profile 12 is in the form of an arc, and the center O2 of the arc is not concentric with the center O3 of the arc of the axial oil sealing edge 11. Patent application CN 116787232 A discloses a device and method for machining and detecting errors of multi-oil wedges on the forming surface of a sliding bearing. The device uses an eccentric structure set in an eccentric bushing to adjust the center of the multi-oil wedge dynamic pressure cavity profile. To meet the machining requirements, the number of eccentric bushings generally needs to be configured in a 1:1 ratio according to the number of hydrostatic bearings being machined. In addition, the fixture in this patent application is for hydrostatic bearings, but not for the machining of hydrostatic spindle units.

[0004] Against the backdrop of the above research, it is necessary to design a set of machining fixtures that can be adapted to the precision machining requirements of the hydrostatic spindle unit's hydrostatic oil wedges of different specifications and sizes. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a set of fixtures for precision machining of the hydrostatic oil wedge profile of hydrostatic spindle units with different specifications and sizes, so as to ensure the machining accuracy of the hydrostatic bearing's hydrostatic oil cavity profile.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A precision machining fixture for a hydrostatic spindle unit with a hydrodynamic wedge-shaped surface includes two sets of paired V-shaped adjustment devices and clamping devices. A micro-displacement adjustment mechanism is respectively installed below the front and rear planes of the V-shaped notch of the V-shaped clamping seat of the V-shaped adjustment device. The input movement directions of the two micro-displacement adjustment mechanisms are parallel to the planes on both sides of the V-shaped notch of the V-shaped clamping seat. Adjustment pads are provided on the outer sides of both micro-displacement adjustment mechanisms, and pre-tightening devices are provided on the left and right sides of the adjustment pads. The pre-tightening devices generate pressure on the micro-displacement adjustment mechanisms through the adjustment pads. Pre-tightening effect; The V-shaped clamp seat of the V-shaped adjustment device is equipped with a V-shaped pressure plate of the clamping device. The V-shaped pressure plate is connected to the connecting rod. By adjusting the height of the connecting rod, the clamping force of the V-shaped pressure plate on the dynamic and static pressure spindle unit can be adjusted; The input motion of the inclined plane micro-displacement adjustment mechanism is transformed into the normal displacement change of the adjustment pad along the two planes of the V-shaped notch of the V-shaped clamp seat; Through the cooperation of the two inclined plane micro-displacement adjustment mechanisms, the eccentric arc center of the dynamic pressure oil wedge of the dynamic and static pressure spindle unit is adjusted from the initial position O2 to the final position that coincides with the center line of the head and tailstock centers.

[0008] Furthermore, the clamping device consists of a side end bracket, a top end bracket, a connecting rod, and a V-shaped pressure plate. The side end bracket is fixedly installed on the rear side plane of the V-shaped clamp seat, and the top end bracket is fixedly installed on the upper side of the side end bracket. The connecting rod is set at the front end of the top end bracket along the vertical direction, and the V-shaped pressure plate is installed below the connecting rod.

[0009] Furthermore, the pre-tightening device consists of a bolt rod, a stacked spring, and a nut. The bolt head of the bolt rod is positioned by a countersunk hole on the adjusting shim. The threaded rod of the bolt rod passes through the positioning hole on the V-shaped clamp seat and then the stacked spring and nut are sequentially fitted on it. The spring force generated by the stacked spring is adjusted by rotating the nut, and finally the magnitude of the pre-tightening force acting on the inclined plane micro-displacement adjustment mechanism is adjusted by the adjusting shim.

[0010] Furthermore, the inclined plane micro-displacement adjustment mechanism consists of a first centering sleeve, a first arc key, a sleeve, a wedge, a second arc key, a threaded sleeve, a guide sleeve, a screw, a scale knob, a connecting screw, a steel ball, a second needle roller assembly, a first needle roller assembly, a flat key, a guide sleeve, and a first compression spring. The V-shaped notch of the V-shaped fixture seat has multi-stage stepped holes parallel to the two side planes below it. The first centering sleeve, the sleeve, and the guide sleeve are sequentially installed in these stepped holes. The front and rear cylindrical surfaces of the sleeve are radially positioned with the V-shaped fixture seat via the multi-stage stepped holes. The sleeve has an axial through hole, in which a wedge is installed. The front and rear sections of the sleeve... The section is equipped with a pair of rectangular windows and rectangular grooves. The front and rear rectangular windows are respectively equipped with a first circular arc key and a second circular arc key, and the front and rear rectangular grooves are equipped with flat keys. The inclined plate is equipped with a first inclined surface structure and a second inclined surface structure. The upper side of the first inclined surface structure and the lower side of the second inclined surface structure are inclined surfaces, and the lower side is a plane. The inclined surfaces and planes on the upper and lower sides of the first inclined surface structure and the second inclined surface structure of the inclined plate are equipped with a first needle roller group and a second needle roller group. Through the rolling of the balls in the first needle roller group and the second needle roller group, the axial linear motion of the inclined plate is transformed into the radial motion of the first circular arc key and the second circular arc key along the sleeve, realizing the micro-displacement adjustment of the inclined surface.

[0011] Furthermore, a guide sleeve is concentrically fixedly installed on the outer side of the sleeve, and a threaded sleeve is fixedly installed inside the guide sleeve. The threaded sleeve is movably installed with a screw through its internal thread, and a scale knob is fixedly installed on the upper end of the screw through a connecting screw. The scale knob is installed on the outer side of the guide sleeve, and the rotation of the scale knob realizes the relative helical movement between the screw and the threaded sleeve.

[0012] Furthermore, the first centering sleeve is positioned and installed with a first compression spring through an internal stepped countersunk hole, so that one end of the first compression spring is axially in contact with the stepped countersunk hole of the first centering sleeve to achieve axial positioning; the other end of the first compression spring is connected to one end of the inclined plate after a guide sleeve is installed; the other end of the inclined plate is provided with a center hole, in which a steel ball is placed, and the inclined plate is movably connected to one end of the screw through the steel ball; the rotation of the scale knob converts the helical motion of the screw into the axial linear motion of the inclined plate through the steel ball, which is the input motion of the inclined plane micro-displacement adjustment mechanism.

[0013] Furthermore, a second compression spring is installed at the midpoint between the first and second inclined surfaces of the sleeve and the wedge. The second compression spring is axially positioned and fixed on the sleeve and the wedge by setting a second positioning sleeve and a pressure sleeve at both ends, thereby generating a pre-compression effect inside the second compression spring to increase the sensitivity of the axial movement of the wedge and eliminate backlash during the return stroke.

[0014] Furthermore, the scale knob is graduated along its circumference, and a proportional relationship is established between the rotation angle of the scale knob and the displacement of the adjustment pad.

[0015] Furthermore, the V-shaped clamp seat is equipped with a circumferential positioning device for circumferential positioning of the sleeve in the inclined plane micro-displacement adjustment mechanism, ensuring that the rectangular window of the sleeve is perpendicular to the side plane of the V-shaped notch of the V-shaped clamp seat; the circumferential positioning device uses a set screw to abut against the side plane or the tapered hole on the outer surface of the sleeve, which is used to prevent the sleeve from rotating around the circumference after the sleeve is installed.

[0016] Furthermore, pads and wear-resistant shims of different thicknesses are fixedly installed above the adjustment pads for machining hydrostatic spindle units with different diameters; the wear-resistant shims have a wear-resistant layer at the center of the upper side, and the wear-resistant layer is made of hard alloy.

[0017] The beneficial effects of this invention are:

[0018] This invention involves installing two V-shaped clamping seats and a clamping device on a machine tool worktable. The V-shaped clamping seats contain a micro-displacement adjustment mechanism on an inclined plane. Rotating a scale knob causes the mechanism to move sequentially through a screw, steel ball, and inclined stop block, then through two sets of needle rollers. This converts the axial movement of the inclined stop block into the radial movement of the arc key within the rectangular window of the sleeve. This adjusts the center of the eccentric arc of the hydrostatic spindle unit's hydrostatic oil wedge from its initial position O2 (not coinciding with the center of the headstock / tailstock center) to its final position (coinciding with the center of the headstock / tailstock center). This satisfies the kinematic requirement that the center of the inner circular surface of the hydrostatic spindle unit's hydrostatic oil wedge profile, ground in the inner hole, coincides with the center of the headstock / tailstock center. By changing the thickness of the shims and / or adjusting pads between the hydrostatic spindle unit and the adjusting shims, it facilitates support for hydrostatic spindle units of different sizes. A pre-tightening device in the V-shaped clamping seats ensures the stability and reliability of the displacement adjustment between the hydrostatic spindle unit and the adjusting shims. This invention has a simple structure, is easy to adjust, and has accurate positioning, which greatly improves the precision machining accuracy of the hydrodynamic oil wedge profile of the hydrostatic bearing spindle unit and has broad application prospects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the hydrostatic bearing hydrostatic oil wedge profile structure of the hydrostatic spindle unit targeted by the present invention;

[0020] Figure 2 This is a front view of the precision machining fixture for the hydrostatic spindle unit's hydrostatic oil wedge profile according to the present invention;

[0021] Figure 3 This is a side view of the precision machining fixture for the hydrostatic spindle unit's hydrodynamic oil wedge profile according to the present invention;

[0022] Figure 4 This is a cross-sectional view showing the connection relationship between the front adjustment device and the pre-tightening device along the V-shaped adjustment device AA section of the precision machining fixture for the hydrostatic spindle unit of the present invention.

[0023] Figure 5 This is a cross-sectional view of the inclined surface micro-displacement adjustment mechanism in the V-shaped adjustment device of the hydrostatic spindle unit's hydrostatic oil wedge-shaped precision machining fixture of the present invention;

[0024] Figure 6 This is a schematic diagram of the inclined plate iron in the inclined surface micro-displacement adjustment mechanism of the V-type adjustment device of the V-type adjustment device of the hydrostatic spindle unit of the present invention, which is a precision machining fixture for hydrostatic spindle unit.

[0025] In the diagram: 1-Hydrodynamic and static pressure spindle unit; 2-V-type adjustment device; 3-Clamping device; 11-Axial oil sealing edge; 12-Dynamic pressure cavity profile; 13-Static pressure cavity; 14-Spindle journal; 21-V-type clamping seat; 22-Front adjustment device; 23-Rear adjustment device; 24-Pre-tightening device; 25-Circumferential positioning device; 31-Side end bracket; 32-Top end bracket; 33-Connecting rod; 34-V-type pressure plate; 201-First centering sleeve; 202-First arc key; 203-Adjusting pad; 204-Sleeve; 205 206-Second arc key; 207-Threaded sleeve; 208-Guide sleeve; 209-Screw; 210-Scale knob; 211-Connecting screw; 212-Steel ball; 213-Second needle roller assembly; 214-Pressure sleeve; 215-Second compression spring; 216-Second positioning sleeve; 217-First needle roller assembly; 218-Flat key; 219-Guide sleeve; 220-First compression spring; 241-Bolt rod; 242-Layered spring; 243-Nut; 2051-First inclined surface structure; 2052-Second inclined surface structure. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figures 2 to 5 As shown in the figure, the present invention provides a precision machining fixture for the hydrostatic wedge surface of a hydrostatic spindle unit, comprising two pairs of V-shaped adjustment devices 2 and clamping devices 3, with the clamping devices 3 located above the V-shaped adjustment devices 2. The V-shaped adjustment device 2 consists of a V-shaped fixture seat 21, a front adjustment device 22, a rear adjustment device 23, and a pre-tightening device 24; the clamping device 3 consists of a side end bracket 31, a top end bracket 32, a connecting rod 33, and a V-shaped pressure plate 34.

[0028] The V-shaped notch is located above the V-shaped clamp seat 21, and the angle corresponding to the V-shaped notch is generally 90°. A front adjustment device 22 and a rear adjustment device 23 are respectively installed below the front and rear planes of the V-shaped notch of the V-shaped clamp seat 21. The front adjustment device 22 and the rear adjustment device 23 consist of a main structure inclined plane micro-displacement adjustment mechanism and a displacement transition adjustment pad 203. The adjustment pad 203 is located outside the inclined plane micro-displacement adjustment mechanism and is in contact with and movably connected to the inclined plane micro-displacement adjustment mechanism. The input movement direction of the inclined plane micro-displacement adjustment mechanism of the front adjustment device 22 is parallel to the front plane of the V-shaped notch of the V-shaped clamp seat 21. The rear adjustment... The input motion direction of the inclined plane micro-displacement adjustment mechanism of device 23 is parallel to the rear plane of the V-shaped notch of V-shaped fixture seat 21; pre-tightening devices 24 are provided on the left and right sides of the adjusting pad 203, and the pre-tightening devices 24 generate a pre-tightening effect on the inclined plane micro-displacement adjustment mechanism of the front adjusting device 22 or the rear adjusting device 23 through the adjusting pad 203; the input motion of the inclined plane micro-displacement adjustment mechanism of the front adjusting device 22 and the rear adjusting device 23 is transformed into the normal displacement change of the adjusting pad 203 along the planes on both sides of the V-shaped notch of V-shaped fixture seat 21. Through the cooperation of the inclined plane micro-displacement adjustment mechanism of the front adjusting device 22 and the inclined plane micro-displacement adjustment mechanism of the rear adjusting device 23, the arc center of the eccentric arc surface of the hydrostatic spindle unit can be adjusted from the initial position O2 to the final position that coincides with the line connecting the center of the head and tailstock centers, satisfying the kinematic requirement that the center of the inner circle surface of the hydrostatic spindle unit workpiece ground by the inner hole coincides with the line connecting the center of the head and tailstock centers.

[0029] The side end bracket 31 of the clamping device 3 is fixedly installed on the rear side plane of the V-shaped clamp seat 21. The top end bracket 32 ​​is fixedly installed on the upper side of the side end bracket 31 in the forward direction. The front end of the top end bracket 32 ​​is provided with a connecting rod 33 along the vertical direction. The V-shaped pressure plate 34 is installed below the connecting rod 33. By adjusting the height of the connecting rod 33, the clamping force of the V-shaped pressure plate 34 on the dynamic and static pressure spindle unit 1 can be adjusted.

[0030] like Figure 3 and Figure 4 As shown, the adjusting pad 203 of the front adjusting device 22 or the rear adjusting device 23 in the V-shaped adjusting device 2 supports the dynamic and static pressure spindle unit 1. The left and right sides of the adjusting pad 203 are provided with pre-tightening devices 24. The pre-tightening device 24 consists of a bolt rod 241, a spring stack 242 and a nut 243. The bolt head of the bolt rod 241 is positioned by the countersunk hole provided on the adjusting pad 203. The threaded rod of the bolt rod 241 passes through the positioning hole provided on the V-shaped clamp seat 21 and then the spring stack 242 and the nut 243 are sequentially mounted. The position of the spring stack 242 on the bolt rod 241 is adjusted by rotating the nut 243. Finally, the magnitude of the pre-tightening force acting on the inclined plane micro-displacement adjusting mechanism is adjusted by the adjusting pad 203.

[0031] like Figure 5 and Figure 6 As shown, the inclined plane micro-displacement adjustment mechanism of the front adjustment device 22 or the rear adjustment device 23 is composed of a first centering sleeve 201, a first arc key 202, a sleeve 204, an inclined plug 205, a second arc key 206, a screw sleeve 207, a guide sleeve 208, a screw 209, a scale knob 210, a connecting screw 211, a steel ball 212, a second needle roller assembly 213, a first needle roller assembly 217, a flat key 218, a guide sleeve 219, and a first compression spring 220. The V-shaped clamp seat 21 has a V-shaped clamp. The notch has multi-stage stepped holes parallel to the two side planes below it. A first centering sleeve 201, a sleeve 204, and a guide sleeve 208 are sequentially installed in these stepped holes. The front and rear cylindrical surfaces of the sleeve 204 are radially positioned with the V-shaped clamp seat 21 via the multi-stage stepped holes. The sleeve 204 has an axial through hole, in which a wedge-shaped insert 205 is installed. The front and rear sections of the sleeve 204 have paired rectangular windows and rectangular countersinks. A first arc key 202 and a second arc key 206 are respectively installed in the openings, and a flat key 218 is installed in the front and rear rectangular recesses; the outer cylindrical surfaces of the first arc key 202 and the second arc key 206 are in contact with the lower inner cylindrical surface of the adjusting pad 203; the inclined plug 205 is provided with a first inclined surface structure 2051 and a second inclined surface structure 2052, the upper side of the first inclined surface structure 2051 and the lower side of the second inclined surface structure 2052 are inclined surfaces, and the lower side is a plane; the first inclined surface structure of the inclined plug 205 The inclined surfaces and planes on the upper and lower sides of the second inclined structure 2051 and the second inclined structure 2052 are provided with a first needle roller group 217 and a second needle roller group 213. Through the rolling of the balls in the first needle roller group 217 and the second needle roller group 213, the linear motion of the inclined plug 205 in the axial direction is transformed into the radial motion of the first circular arc key 202 and the second circular arc key 206 along the sleeve 204, thereby realizing the micro-displacement adjustment function of the inclined surface. In other words, the radial motion of the sleeve 204 is the output motion of the micro-displacement adjustment mechanism of the inclined surface.

[0032] To measure the axial displacement of the inclined plug 205 under preload, a guide sleeve 208 is concentrically fixedly installed on the outer side of the sleeve 204, and a threaded sleeve 207 is fixedly installed inside the guide sleeve 208. A screw 209 is movably installed on the threaded sleeve 207 via an internal thread. A scale knob 210 is fixedly installed on the upper end of the screw 209 via a connecting screw 211. The scale knob 210 is fitted onto the outer side of the guide sleeve 208. Rotation of the scale knob 210 achieves relative helical movement between the screw 209 and the threaded sleeve 207. A first compression spring 220 is positioned at the center of the first centering sleeve 201 through an internal stepped countersunk hole, such that one end of the first compression spring 220 axially contacts the stepped countersunk hole of the first centering sleeve 201 to achieve axial positioning. Position; the other end of the first compression spring 220 is fitted with a guide sleeve 219 and then makes planar contact with one end of the inclined plate 205; the other end of the inclined plate 205 is provided with a central hole, in which a steel ball 212 is placed, and the inclined plate 205 is movably connected to one end of the screw 209 through the steel ball 212; the rotation of the scale knob 210, through the screw 209, converts the spiral motion of the screw 209 into the axial linear motion of the inclined plate 205 through the steel ball 212, and then through two sets of needle rollers, the axial motion of the inclined plate 205 is converted into the radial motion of the arc keys (202, 206) provided in the sleeve 204 in the front adjustment device 22 and the rear adjustment device 23. This is the output motion of the inclined plane micro-displacement adjustment mechanism.

[0033] To increase the sensitivity of the axial movement of the inclined plate 205 and the elimination of backlash during the return stroke, a second compression spring 215 is installed in the middle position of the sleeve 204 corresponding to the first inclined surface structure 2051 and the second inclined surface structure 2052 of the inclined plate 205. The second compression spring 215 is axially positioned and fixed on the sleeve 204 and the inclined plate 205 by the second positioning sleeve 216 and the pressure sleeve 214 at both ends, respectively, thereby realizing the pre-compression effect inside the second compression spring 215.

[0034] The scale knob 210 is engraved with graduations along its circumference. The rotation angle of the scale knob 210 is proportional to the conversion of the inclined plate 205, the first needle roller group 217, the second needle roller group 213, the first arc key 202 and the second arc key 206 in the inclined micro-displacement adjustment mechanism, and the magnitude of the normal displacement change of the adjusting pad 203 along the V-shaped notch side plane of the V-shaped clamp seat 21.

[0035] After the sleeve 204 is installed, in order to prevent the sleeve 204 from rotating around the circumference, a circumferential positioning device 25 is provided on the V-shaped clamp seat 21 to circumferentially position the sleeve 204 in the front adjustment device 22 and the rear adjustment device 23, so that the sleeve 204 is circumferentially fixed and the rectangular window of the sleeve 204 is perpendicular to the side plane of the V-shaped notch of the V-shaped clamp seat 21. The circumferential positioning device 25 can be provided by using a set screw to abut against the side plane or the tapered hole on the outer surface of the sleeve 204.

[0036] The adjusting shim 203 can be used to fix and install shims and wear-resistant shims of different thicknesses for machining hydrostatic spindle units with different diameters. The wear-resistant shims have a wear-resistant layer at the center of the upper side, and the wear-resistant layer is made of cemented carbide.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent structural changes made based on the description and drawings of this invention are similarly included within the scope of the invention.

Claims

1. A precision machining fixture for the hydrostatic wedge profile of a hydrostatic spindle unit, characterized in that: The device includes two sets of paired V-shaped adjustment devices and clamping devices. A micro-displacement adjustment mechanism is installed below the front and rear planes of the V-shaped notch of the V-shaped clamp seat of the V-shaped adjustment device. The input movement directions of the two micro-displacement adjustment mechanisms are parallel to the planes on both sides of the V-shaped notch of the V-shaped clamp seat. Multi-stage stepped holes, parallel to the planes on both sides, are provided below the front and rear planes of the V-shaped notch of the V-shaped clamp seat. The first centering sleeve, sleeve, and guide sleeve of the micro-displacement adjustment mechanism are sequentially installed in the multi-stage stepped holes. The front and rear cylindrical surfaces of the sleeve are radially positioned with the V-shaped clamp seat via the multi-stage stepped holes. The front and rear sections of the sleeve have paired rectangular windows and rectangular grooves. A circumferential positioning device is provided on the V-shaped clamp seat to circumferentially position the sleeve, ensuring that the rectangular window of the sleeve remains perpendicular to the side plane of the V-shaped notch of the V-shaped clamp seat. Set screws are used to abut against the side plane or tapered hole on the outer surface of the sleeve to prevent the sleeve from rotating around its circumference after installation. Adjusting pads are provided on the outer sides of both inclined micro-displacement adjustment mechanisms, and pre-tightening devices are located on both sides of the adjusting pads. The pre-tightening devices exert a pre-tightening effect on the inclined micro-displacement adjustment mechanisms through the adjusting pads. A V-shaped pressure plate of a clamping device is located above the V-shaped clamp seat of the V-shaped adjustment device. The V-shaped pressure plate is connected to a connecting rod, and the clamping force of the V-shaped pressure plate on the dynamic and static pressure spindle unit can be adjusted by adjusting the height of the connecting rod. The input motion of the inclined micro-displacement adjustment mechanism is transformed into the normal displacement of the adjusting pads along the planes on both sides of the V-shaped notch of the V-shaped clamp seat. Through the cooperation of the two inclined micro-displacement adjustment mechanisms, the eccentric arc center of the dynamic pressure oil wedge of the dynamic and static pressure spindle unit is adjusted from the initial position O2 to the final position coinciding with the center line of the head and tailstock centers.

2. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge profile according to claim 1, characterized in that: The clamping device consists of a side end bracket, a top end bracket, a connecting rod, and a V-shaped pressure plate. The side end bracket is fixedly installed on the rear side plane of the V-shaped clamp seat. The top end bracket is fixedly installed on the upper side of the side end bracket and forward. The connecting rod is set at the front end of the top end bracket along the vertical direction, and the V-shaped pressure plate is installed below the connecting rod.

3. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge profile according to claim 1, characterized in that: The pre-tightening device consists of a bolt rod, a stacked spring, and a nut. The bolt head of the bolt rod is positioned by a countersunk hole on the adjusting shim. The threaded rod of the bolt rod passes through the positioning hole on the V-shaped clamp seat and then the stacked spring and nut are sequentially fitted on it. The spring force generated by the stacked spring is adjusted by rotating the nut, and finally the magnitude of the pre-tightening force acting on the inclined plane micro-displacement adjustment mechanism is adjusted by the adjusting shim.

4. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge profile according to claim 1, characterized in that: The inclined plane micro-displacement adjustment mechanism consists of a first centering sleeve, a first arc key, a sleeve, an inclined plug, a second arc key, a screw sleeve, a guide sleeve, a screw, a scale knob, a connecting screw, a steel ball, a second needle roller group, a first needle roller group, a flat key, a guide sleeve, and a first compression spring. The sleeve has an axial through hole, and the inclined plug is installed in the axial through hole of the sleeve. The first arc key and the second arc key are installed in the front and rear rectangular windows of the sleeve, respectively, and the flat key is installed in the front and rear rectangular grooves. The inclined plug has a first inclined plane structure and a second inclined plane structure. The upper side of the first inclined plane structure and the lower side of the second inclined plane structure are inclined planes, and the lower side is a plane. The inclined plane and the plane on the upper and lower sides of the first inclined plane structure and the second inclined plane structure of the inclined plug are equipped with a first needle roller group and a second needle roller group. Through the rolling of the balls in the first needle roller group and the second needle roller group, the axial linear motion of the inclined plug is transformed into the radial motion of the first arc key and the second arc key along the sleeve, thereby realizing the inclined plane micro-displacement adjustment function.

5. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge surface according to claim 4, characterized in that: A guide sleeve is concentrically fixed on the outer side of the sleeve, and a threaded sleeve is fixedly installed inside the guide sleeve. The threaded sleeve is movably installed with a screw through its internal thread. A scale knob is fixedly installed on the upper end of the screw through a connecting screw. The scale knob is sleeved on the outer side of the guide sleeve. The rotation of the scale knob realizes the relative helical movement between the screw and the threaded sleeve.

6. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge surface according to claim 4, characterized in that: The first centering sleeve is positioned and installed with the first compression spring through an internal stepped countersunk hole, so that one end of the first compression spring is axially in contact with the stepped countersunk hole of the first centering sleeve to achieve axial positioning; the other end of the first compression spring is connected to the plane of one end of the inclined plate after the guide sleeve is installed; the other end of the inclined plate is provided with a center hole, in which a steel ball is placed, and the inclined plate is movably connected to one end of the screw through the steel ball; the rotation of the scale knob converts the helical motion of the screw into the axial linear motion of the inclined plate through the steel ball, which is the input motion of the inclined plane micro-displacement adjustment mechanism.

7. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge surface according to claim 4, characterized in that: A second compression spring is installed at the middle position of the first and second inclined surfaces of the sleeve corresponding to the wedge. The second compression spring is axially positioned and fixed on the sleeve and the wedge by setting a second positioning sleeve and a pressure sleeve at both ends, thereby realizing the pre-compression effect inside the second compression spring, which is used to increase the sensitivity of the axial movement of the wedge and eliminate backlash during return.

8. The precision machining fixture for the hydrostatic spindle unit's hydrodynamic wedge surface according to claim 4, characterized in that: The scale knob is graduated along its circumference, and the angle of rotation of the scale knob is proportional to the displacement of the adjustment pad.

9. The precision machining fixture for the hydrostatic wedge profile of the hydrostatic spindle unit according to claim 1, characterized in that: The upper part of the adjusting pad is fixedly installed with pads and wear-resistant shims of different thicknesses for machining hydrostatic spindle units with different diameters; the upper center of the wear-resistant shim is provided with a wear-resistant layer, which is made of hard alloy.

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