A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing

Abstract

The present invention relates to a method for manufacturing a multi-oil wedge conical dynamic and static pressure bearing, and relates to the technical field of mechanical manufacturing of dynamic and static pressure bearings. First, the outer conical surface, small end face and inner hole of the bearing are processed by turning, boring and other methods; secondly, the outer conical surface, small end face and inner hole are roughly ground by a grinding plate, and the large end face is flat ground; then, lines are drawn, and conical ribs, rectangular ribs and oil grooves and other features are processed by wire cutting; then, the outer conical surface, small end face and inner hole are fine-ground, and the large end face is fine-ground; then, conical ribs, rectangular ribs and oil grooves and other features are corrected by wire cutting. When the design accuracy requirements are very high, the outer conical surface and small end face of the bearing are continued to be ultra-fine ground, and the inner hole of the bearing is ultra-precision ground by a shaft system component, and the oil cavity depth is measured and scraped and corrected. The process route of the present invention is simple and can meet the use requirements of high consistency requirements for machining accuracy of multi-oil wedge oil cavities of conical dynamic and static pressure bearings.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing dynamic and static pressure bearings, in particular to a manufacturing method of a multi-oil wedge tapered dynamic and static pressure bearing. Background Art

[0002] Bearings are one of the key components that influence machine tool machining accuracy. Improving their rotational accuracy, vibration resistance, and dynamic rigidity is receiving increasing attention. In addition to rolling bearings, a considerable number of machine tool spindles currently utilize hydrostatic or hydrodynamic sliding bearings. In hydrostatic sliding bearings, once the oil supply system is activated, the spindle and bearings are in a liquid lubrication state. This makes the bearings less affected by relative speed, allowing for a wide range of speed variations, long component life, and low starting power. Hydrodynamic sliding bearings utilize the pressure effect generated by a viscous fluid flowing into a wedge-shaped converging gap. During the transition from standstill, startup, and stable operation, when the journal speed is low, the pressure effect is insufficient to fully lift the spindle. Consequently, the journal and bearing enter a non-liquid lubricated contact state (boundary film lubrication). The journal rolls along the inner surface of the bearing, causing frictional contact wear. The hydrodynamic hydrostatic sliding bearing (abbreviated as hydrostatic bearing) is a type of sliding bearing developed based on hydrodynamic and hydrostatic sliding bearings. It combines the characteristics of both hydrodynamic and hydrostatic sliding bearings and has been widely used in roll grinders.

[0003] Attachment Figure 1 and Figure 2 The figure shows a structure of a dynamic and static pressure bearing used in a roll grinder. The inner hole of the dynamic and static pressure bearing 6 is provided with four oil grooves 9 along the axial direction, and the outer surface is provided with four conical ribs 12 and four rectangular ribs 13. The rectangular ribs 13 are provided with oil inlet holes 10 leading to the oil grooves 9. When working, the dynamic and static pressure bearing 6 is embedded in a steel sleeve 4 with the same taper as the conical ribs 12. The left end of the steel sleeve 4 is provided with a left retaining ring 3 and a left pressure cover 2 in sequence, and the right end is provided with a right retaining ring 8 and a right pressure cover 7 in sequence. The steel sleeve 4 is movably arranged. Installed in the bearing hole of the body shell 5, loosen the right gland 7 on the right, tighten the left gland 2, and force the dynamic and static pressure bearing 6 to move rightward relative to the steel sleeve 4 through the left retaining ring 3. At this time, the steel sleeve 4 generates side pressure on the dynamic and static pressure bearing 6 at the conical rib 12, forcing the inner hole of the dynamic and static pressure bearing 6 to deform inward at the position corresponding to the conical rib 12, and the rectangular rib 13 to deform outward. At this time, the inner hole of the dynamic and static pressure bearing 6 produces different degrees of non-circular deformation, thus forming multiple wedge-shaped dynamic pressure cavities with different gaps with the main shaft 1 ( Figure 1 The inner diameter of the middle bearing is D, the diameter of the main shaft is d, Figure 5(The wedge-shaped oil chambers A4 and B3 are provided.) CN103307105B discloses a dynamic and static pressure bearing for a grinding head of a high-speed roll grinder and its manufacturing method. The manufacturing method adds specific features to the dynamic and static pressure bearing structure based on its intended use, but does not provide specific manufacturing methods for these components and the added features. Because the steel sleeve 4 has a continuous outer circular and inner conical surface, its machining difficulty is much less than that of the dynamic and static pressure bearing 6.

[0004] In the above research context, it is necessary to provide a set of manufacturing processes for the structure of dynamic and static pressure bearings to adapt to the precision machining of dynamic and static pressure bearings with such special-shaped structures. Summary of the Invention

[0005] In order to solve at least one technical problem in the background technology, the present invention provides a method for manufacturing a multi-oil wedge conical dynamic and static pressure bearing. The process route is simple and can meet the use requirements of high consistency in machining accuracy of multi-oil wedge oil cavities of conical dynamic and static pressure bearings.

[0006] To achieve the above-mentioned object, the present invention provides a method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing, comprising the following steps:

[0007] Step S1: Processing the outer conical surface, oil groove, small end face, large end face and inner hole of the dynamic and static pressure bearing;

[0008] Step S2: according to the number of tapered ribs designed for the dynamic and static pressure bearing, the same number of threaded holes are machined on the large end surface of the dynamic and static pressure bearing;

[0009] Step S3: grinding the E surface of the outer conical surface of the dynamic and static pressure bearing, the F surface of the small end surface, the G surface of the bearing inner hole, and the H surface where the large end surface is located;

[0010] Step S4: Based on the number of conical ribs of the hydrostatic bearing, and with the centerline OO of the bearing inner hole as a reference, mark the conical ribs, rectangular ribs, and oil grooves. Mark the oil cavity boundary points A1, A2, A3, A4, A5, A6, A7, and A8 on the bearing inner hole surface corresponding to the positions of the conical ribs. Mark the transition points B1, B2, B3, B4, B5, B6, B7, and B8 representing the connection between the oil groove and the bearing inner hole. Mark the representative points C1, C2, C3, C4, C5, C6, C7, C8, and C9 representing the structural features of the conical ribs and rectangular ribs formed by the outer conical surface.

[0011] Step S5: Cut out the conical ribs and rectangular ribs structural features on the wire cutting machine according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9; cut out the oil grooves according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8; during wire cutting, a certain machining allowance is left for the diameter D1 of the connecting structure between the conical ribs and the rectangular ribs, and for the diameter D2 of the rectangular ribs;

[0012] Step S6: precision grinding the E surface of the outer conical surface and the F surface of the small end surface of the dynamic and static pressure bearing, and precision grinding the G surface of the inner hole of the bearing;

[0013] Step S7: According to the number of conical ribs of the dynamic and static pressure bearing, the conical ribs, rectangular ribs and oil grooves are marked with the center line OO of the bearing inner hole as the reference, and the large end face of the dynamic and static pressure bearing is marked;

[0014] Step S8: On the wire cutting machine, the structural features of the conical ribs and rectangular ribs cut in step S5 are corrected according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9; the oil grooves cut in step S5 are corrected according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8, so that the wall thickness consistency of the shaft diameters D2 and D1 relative to the bearing inner hole diameter D meets the process requirements.

[0015] Furthermore, in step S1, the specific method for processing the outer conical surface, oil groove, small end face and inner hole of the dynamic and static pressure bearing is: clamp the outer circle of the incoming material with a chuck, turn the outer conical surface of the dynamic and static pressure bearing, leave a processing allowance, and use the color painting method to check the contact working length between the outer conical surface and the inner conical surface of the ring gauge; turn the oil groove to size; turn the small end face of the dynamic and static pressure bearing, leaving a processing allowance in the length direction; bore the bearing inner hole of the dynamic and static pressure bearing, leaving a processing allowance; complete the above-mentioned processing in one clamping to ensure the form and position tolerance accuracy requirements of the outer conical surface, small end face and bearing inner hole processes.

[0016] Furthermore, the specific method of step S3 is: fixing the large end face of the dynamic and static pressure bearing on the grinding clamp by connecting screws relying on the threaded holes; clamping the outer cylindrical surface of the grinding clamp by a four-jaw chuck, marking the outer conical surface and the small end face of the dynamic and static pressure bearing, adjusting the four jaws of the four-jaw chuck so that the accuracy of the outer conical surface and the small end face meets certain requirements, grinding the E surface of the outer conical surface and the F surface of the small end face, leaving a grinding allowance, checking the contact working length of the outer conical surface and the inner conical surface of the ring gauge by a coloring method, grinding the G surface of the bearing inner hole after meeting certain requirements, so that the concentricity of the bearing inner hole and the outer conical surface and the surface roughness of the bearing inner hole itself meet the process requirements of the process; taking the small end face of the dynamic and static pressure bearing as the reference F, grinding the H surface where the large end face of the dynamic and static pressure bearing is located, leaving a grinding allowance, so that the surface roughness of the large end face and the parallelism with the small end face meet the process requirements of the process.

[0017] Furthermore, in step S6, the dynamic and static pressure bearings are fixed on the grinding plate by connecting screws relying on the threaded holes, the outer cylindrical surface of the grinding plate is clamped by a four-jaw chuck, the outer conical surface and the small end face of the dynamic and static pressure bearings are measured, and the four jaws of the chuck are adjusted so that the accuracy of the outer conical surface and the small end face meets certain requirements. The outer conical surface and the small end face are precision ground, leaving a grinding allowance, and the contact working length between the outer conical surface and the inner conical surface of the ring gauge is checked by a coloring method. After meeting certain requirements, the inner hole of the bearing is precision ground, leaving a grinding allowance, so that the concentricity of the inner hole of the bearing and the outer conical surface and the surface roughness of the inner hole of the bearing itself meet the process requirements of this process.

[0018] Furthermore, in step S7, the method of marking on the large end face of the dynamic and static pressure bearing is: using A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3, B4, B5, B6, B7, B8, C1, C2, C3, C4, C5, C6, C7, C8, C9 for marking, A1, A2, A3, A4, A5, A6, A7, A8 correspond to the oil cavity demarcation point of the bearing inner hole surface at the position of the tapered rib, B1, B2, B3, B4, B5, B6, B7, B8 represent the transition point where the oil groove is connected to the bearing inner hole of the dynamic and static pressure bearing, and C1, C2, C3, C4, C5, C6, C7, C8, C9 represent representative points of the structural features of the tapered rib and the rectangular rib formed on the outer conical surface.

[0019] Furthermore, after step S5 or step S8, the following step is added: performing aging treatment on the dynamic and static pressure bearings 6 to reduce residual stress.

[0020] Furthermore, add after step S8:

[0021] Step S9: grinding the large end surface 601 and the small end surface 603 of the dynamic and static pressure bearing 6 to improve the parallelism of the large end surface 601 and the small end surface 603;

[0022] Step S10: measuring the small end surface 603 and the outer conical surface 604 of the dynamic and static pressure bearing 6, and ultra-precision grinding the outer conical surface 604;

[0023] Step S11: measuring the small end surface 603 and the outer conical surface 604 of the dynamic and static pressure bearing 6, adjusting the installation accuracy and then ultra-precision grinding the bearing inner hole 602 of the dynamic and static pressure bearing 6;

[0024] Step S12: Sleeve the outer sleeve 16 on the outer cylindrical surface of the steel sleeve 4 and place the entire assembly on the V-shaped seat 17, rotate the outer sleeve 16, and measure the oil cavity depth of each oil cavity transition point B1, B2, B3, B4, B5, B6, B7, and B8 relative to the oil cavity demarcation points A1, A2, A3, A4, A5, A6, A7, and A8 on both sides of the oil groove 9, where the oil cavity depth of point B3 relative to point A4 is h; record the value of each oil cavity depth h per rotation of the outer sleeve 16; by adjusting the distance of screwing in and out of the left gland 2 along the Z1 direction, change the position of the dynamic and static pressure bearing 6 relative to the steel sleeve 4 along the Z2 direction, and change the contact force between the conical rib 12 and the inner conical surface of the steel sleeve 4, measure and record the value of each oil cavity depth h per rotation of the outer sleeve 16;

[0025] Step S13: Process the data of the oil cavity depth h of step S12 to obtain the consistency error between the oil wedge data; if the consistency error exceeds the design requirement, use the scraping method to correct and reduce the consistency error; this step is repeated multiple times until the oil cavity depth h of the dynamic and static pressure bearing 6 finally meets the consistency error design requirement.

[0026] Furthermore, in step S10, the dynamic and static pressure bearings are fixed on the grinding plate by connecting screws relying on the threaded holes, and then the outer cylindrical surface of the grinding plate is clamped by a four-jaw chuck, and the small end face and outer conical surface of the dynamic and static pressure bearings are measured, and the four jaws of the chuck are adjusted so that the outer conical surface and the small end face meet higher precision requirements, and the outer conical surface is ultra-precision ground so that the size of the outer conical surface is within the design tolerance range and the surface roughness meets the design requirements.

[0027] Furthermore, in step S11, the hydrostatic and dynamic bearings are installed into the steel sleeve, and a certain contact force is generated between the conical ribs of the hydrostatic and dynamic bearings and the inner conical surface of the steel sleeve through the left retaining ring by using the left pressure cover, and the left retaining ring is firmly sucked by the clamping permanent magnetic suction cup of the four-jaw chuck, so that the size of the inner hole of the bearing is within the design tolerance range, and the roundness and surface roughness meet the design requirements.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides a method for manufacturing a multi-oil wedge conical dynamic and static pressure bearing. The method uses the inner hole of the bearing and the outer conical surface of the conical rib as mutual references, and based on the processing route of typical surfaces in the mechanical manufacturing process regulations, continuously improves the concentricity between the inner hole of the bearing and the outer conical surface, and the perpendicularity between the end face of the bearing and the inner hole of the bearing through rough grinding, fine grinding and super fine grinding. The inner hole of the bearing after rough grinding is used as a reference, the conical ribs, rectangular ribs and oil grooves are marked, and the conical ribs, rectangular ribs and oil grooves are processed by wire cutting method, so that the multiple groups of rectangular ribs and oil grooves between the two conical ribs have high structural symmetry, dimensional consistency and consistency of form and position error accuracy relative to the inner hole of the bearing. The machined bearing is installed in the steel sleeve of the shaft system assembly, the axial position of the dynamic and static pressure bearing is adjusted by using the pressure cover, and the consistency of the oil cavity depth is judged by measuring the size of the dynamic pressure wedge oil cavity of the inner hole of the dynamic and static pressure bearing at different axial positions. When the depth consistency error is large, the depth of the dynamic pressure wedge oil cavity is corrected by scraping. Through the aforementioned various processing strategies, high-precision processing of dynamic and static pressure bearings is achieved. This manufacturing method is simple and easy to implement, and effectively ensures the processing accuracy of the multi-oil wedge structure of the dynamic and static pressure bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the shaft system structure in which the dynamic and static pressure bearings according to the present invention are used;

[0031] Figure 2 This is a three-dimensional schematic diagram of the dynamic and static pressure bearing structure involved in the present invention;

[0032] Figure 3 This is a schematic diagram of clamping during the grinding process of a dynamic and static pressure bearing according to the present invention;

[0033] Figure 4 It is a schematic cross-sectional view showing the multi-oil wedge structure of the dynamic and static pressure bearing according to the present invention;

[0034] Figure 5 It is a schematic diagram showing the change in the depth of the oil cavity of the multi-oil wedge structure of the dynamic and static pressure bearing according to the present invention;

[0035] Figure 6 This is a schematic diagram of the axial position when the shaft system assembly is used to detect the depth of the oil cavity on the inner surface of the dynamic and static pressure bearing involved in the present invention;

[0036] Figure 7 It is a support schematic diagram when using a shaft system component to detect the depth of the oil cavity on the inner surface of the dynamic and static pressure bearing involved in the present invention.

[0037] In the figure: 1-main shaft; 2-left pressure cover; 3-left retaining ring; 4-steel sleeve; 5-body; 6-dynamic and static pressure bearings; 7-right pressure cover; 8-right retaining ring; 9-oil groove; 10-oil inlet hole; 11-oil trough; 12-conical rib; 13-rectangular rib; 14-connecting screw; 15-grinding clamp; 16-outer sleeve; 17-V-type seat; 18-threaded hole; 601-large end face; 602-bearing inner hole; 603-small end face; 604-outer conical surface. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0041] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0042] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] In view of the structure of the dynamic and static pressure bearing, the present invention provides a method for manufacturing a multi-oil wedge conical dynamic and static pressure bearing. Based on the processing route and positioning reference selection principle of the typical surface of the mechanical manufacturing process regulations, the precision processing of the outer conical surface, end face and inner hole of the dynamic and static pressure bearing is achieved by setting a grinding tool; the conical ribs, rectangular ribs and oil grooves and other features are cut out by the position line determined by scribing; the depth of the dynamic pressure wedge oil cavity of the dynamic and static pressure bearing is measured by a measuring tool. If the consistency error is too large, a scraping method is used to correct it; through a complete set of technical solutions, the technical difficulties of the precision manufacturing of multi-oil wedge conical dynamic and static pressure bearings are solved.

[0044] To achieve the above purpose, Figure 1-7 As shown, the present invention provides a method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing, comprising the following steps:

[0045] Step S1: Turning the outer conical surface 604, the oil groove 11, the small end surface 603 and the large end surface 601 of the dynamic and static pressure bearing 6, and boring the bearing inner hole 602 of the dynamic and static pressure bearing 6, leaving a machining allowance to ensure the geometric and positional tolerance accuracy requirements of the outer conical surface 604, the small end surface 603, the large end surface 601 and the bearing inner hole 602;

[0046] Step S2: according to the number of conical ribs 12 designed for the hydrostatic and dynamic bearing 6, the same number of threaded holes 18 are machined on the large end surface 601 of the hydrostatic and dynamic bearing 6;

[0047] Step S3: Figure 3As shown, the large end face 601 of the dynamic and static pressure bearing 6 is fixed to the grinding clamping plate 15 by the connecting screw 14 relying on the threaded hole 18; the outer cylindrical surface of the grinding clamping plate 15 is clamped by the four-jaw chuck, and the four jaws of the four-jaw chuck are adjusted so that the run-out error of the outer conical surface 604 and the small end face 603 meets certain requirements, and then the E surface of the outer conical surface 604 and the F surface of the small end face 603 are ground, and the contact working length of the outer conical surface 604 and the inner conical surface of the ring gauge are checked by the coloring method; after meeting the requirements, the G surface of the bearing inner hole 602 is ground so that the concentricity of the bearing inner hole 602 and the outer conical surface 604 and the surface roughness of the bearing inner hole 602 itself meet the process requirements of the process; with the small end face 603 of the dynamic and static pressure bearing 6 as the reference F, the H surface where the large end face 601 of the dynamic and static pressure bearing 6 is located is ground so that the surface roughness of the large end face 601 and the parallelism with the small end face 603 meet the process requirements of the process;

[0048] Step S4: Figure 4 As shown, according to the number of conical ribs 12 of the hydrostatic bearing 6, with the center line OO of the bearing inner hole 602 as the reference, the conical ribs 12, the rectangular ribs 13 and the oil groove 9 are marked, and the oil cavity boundary points A1, A2, A3, A4, A5, A6, A7, and A8 on the surface of the bearing inner hole 602 corresponding to the positions of the conical ribs 12 are marked. The transition points B1, B2, B3, B4, B5, B6, B7, and B8 representing the connection between the oil groove 9 and the bearing inner hole 602 are marked. The representative points C1, C2, C3, C4, C5, C6, C7, C8, and C9 representing the structural features of the outer conical surface 604 forming the conical ribs 12 and the rectangular ribs 13 are marked;

[0049] Step S5: Cut out the conical ribs 12 and the rectangular ribs 13 and other structural features on the wire cutting machine according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9; cut out the oil grooves 9 according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8; during the wire cutting, a certain machining allowance is left for the diameter D1 of the connecting structure between the conical ribs 12 and the rectangular ribs 13 and the diameter D2 of the rectangular ribs;

[0050] Step S6: Fix the dynamic and static pressure bearing 6 on the grinding clamping plate 15 by means of the connecting screws 14 relying on the threaded holes 18, clamp the outer cylindrical surface of the grinding clamping plate 15 by means of a four-jaw chuck, adjust the four jaws of the chuck so that the runout error of the outer conical surface 604 and the small end surface 603 meet certain requirements, then precisely grind the E surface of the outer conical surface 604 and the F surface of the small end surface 603, and check the contact working length of the outer conical surface 604 and the inner conical surface of the ring gauge by a coloring method. After meeting the requirements, precisely grind the G surface of the bearing inner hole 602 so that the concentricity of the bearing inner hole 602 and the outer conical surface 604 and the surface roughness of the bearing inner hole 602 itself meet the process requirements of this process;

[0051] Step S7: Figure 4 As shown, the method of marking on the large end face 601 of the hydrostatic bearing 6 is: using A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3, B4, B5, B6, B7, B8, C1, C2, C3, C4, C5, C6, C7, C8, C9 for marking, A1, A2, A3, A4, A5, A6, A7, A8 correspond to the oil cavity boundary points on the surface of the bearing inner hole 602 at the position of the tapered rib 12, B1, B2, B3, B4, B5, B6, B7, B8 represent the transition points where the oil groove 9 is connected to the bearing inner hole 602 of the hydrostatic bearing 6, C1, C2, C3, C4, C5, C6, C7, C8, C9 represent representative points of structural features such as the tapered rib 12 and the rectangular rib 13 formed by the outer conical surface 604;

[0052] Step S8: On the wire cutting machine, the structural features of the conical ribs 12 and the rectangular ribs 13 cut in step S5 are corrected according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9; the oil grooves 9 cut in step S5 are corrected according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8, so that the wall thickness consistency of the shaft diameters D2 and D1 relative to the bearing inner hole diameter D meets the process requirements.

[0053] In order to reduce the influence of residual stress on the performance of the hydrodynamic and hydrostatic bearing 6 during the wire cutting process, the following steps are added after implementing step S5 or step S8:

[0054] Step S′: performing aging treatment on the dynamic and static pressure bearing 6 to reduce residual stress.

[0055] In order to further improve the machining accuracy of the dynamic and static pressure bearing 6, after implementing step S8, the following steps are added:

[0056] Step S9: grinding the large end surface 601 and the small end surface 603 of the dynamic and static pressure bearing 6, so that the parallelism accuracy of the large end surface 601 and the small end surface 603 is further improved;

[0057] Step S10: Figure 3 As shown, the dynamic and static pressure bearing 6 is fixed to the grinding clamp 15 by means of the connecting screws 14 and the threaded holes 18. Then, the outer cylindrical surface of the grinding clamp 15 is clamped by a four-jaw chuck. The outer conical surface 604 and the small end surface 603 are measured by dialing. After the four jaws of the chuck are adjusted so that the runout error of the outer conical surface 604 and the small end surface 603 meets certain requirements, the outer conical surface 604 is ultra-precision ground so that the size of the outer conical surface 604 is within the design tolerance range and the surface roughness meets the design requirements.

[0058] Step S11: Figure 6As shown, the dynamic and static pressure bearing 6 is installed into the steel sleeve 4, and a certain contact force is generated between the conical rib 12 of the dynamic and static pressure bearing 6 and the inner conical surface of the steel sleeve 4 by the left gland 2 through the left retaining ring 3. The left retaining ring 3 is firmly fixed by the clamping permanent magnetic chuck of the four-jaw chuck, and the runout error of the outer conical surface 604 is corrected. After meeting certain requirements, the bearing inner hole 602 is ultra-precision ground to improve the roundness, surface roughness and other processing accuracy of the bearing inner hole 602;

[0059] Step S12: Press Figure 7 As shown, an outer sleeve 16 is placed on the outer cylindrical surface of the steel sleeve 4 and the entire assembly is placed on the V-shaped seat 17. The outer sleeve 16 is rotated to measure the oil cavity depth of each oil cavity transition point B1, B2, B3, B4, B5, B6, B7, B8 relative to the oil cavity boundary points A1, A2, A3, A4, A5, A6, A7, A8 on both sides of the oil groove 9, as shown in FIG. Figure 5 As shown, the oil cavity depth of point B3 relative to A4 is h; record the value of the oil cavity depth h for each rotation of the outer sleeve 16; by adjusting the left gland 2 along Figure 6 The distance of screwing in and out in the Z1 direction changes the direction of the dynamic and static pressure bearing 6 relative to the steel sleeve 4. Figure 6 At the position in the Z2 direction shown, the contact force between the conical rib 12 and the inner conical surface of the steel sleeve 4 is changed, and the value of the depth h of each oil cavity per rotation of the outer sleeve 16 is measured and recorded;

[0060] Step S13: Process the data of the oil cavity depth h of step S12 to obtain the consistency error between the oil wedge data; if the consistency error exceeds the design requirement, use the scraping method to correct and reduce the consistency error; this step is repeated multiple times until the oil cavity depth h of the dynamic and static pressure bearing 6 finally meets the consistency error design requirement.

[0061] The present invention provides a method for manufacturing a multi-oil wedge conical dynamic and static pressure bearing. The method uses the inner hole of the bearing and the outer conical surface of the conical rib as mutual references, and based on the processing route of typical surfaces in the mechanical manufacturing process regulations, continuously improves the concentricity between the inner hole of the bearing and the outer conical surface, and the perpendicularity between the end face of the bearing and the inner hole of the bearing through rough grinding and fine grinding. The inner hole of the bearing after rough grinding is used as a reference, the conical ribs, rectangular ribs and oil grooves are marked, and the conical ribs, rectangular ribs and oil grooves are processed by the wire cutting method, so that the multiple groups of rectangular ribs and oil grooves between the two conical ribs have high structural symmetry, dimensional consistency and consistency of form and position error accuracy relative to the inner hole of the bearing. The machined bearing is installed in the steel sleeve of the shaft system assembly, the axial position of the dynamic and static pressure bearing is adjusted by using the pressure cover, and the consistency of the oil cavity depth is judged by measuring the size of the dynamic pressure wedge oil cavity of the inner hole of the dynamic and static pressure bearing at different axial positions. When the depth consistency error is large, the depth of the dynamic pressure wedge oil cavity is corrected by scraping. Through the aforementioned various processing strategies, high-precision processing of the dynamic and static pressure bearings is achieved. This manufacturing method is simple and easy to implement, and effectively ensures the processing accuracy of the multi-oil wedge structure of the dynamic and static pressure bearings.

[0062] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing, characterized in that: The steps include: Step S1: Processing the outer conical surface (604), oil groove (11), small end surface (603), large end surface (601) and bearing inner hole (602) of the dynamic and static pressure bearing (6); Step S2: according to the number of conical ribs (12) designed for the dynamic and static pressure bearing (6), the same number of threaded holes (18) are processed on the large end surface (601) of the dynamic and static pressure bearing (6); Step S3: grinding the E surface of the outer conical surface (604) of the dynamic and static pressure bearing (6), the F surface of the small end surface (603), the G surface of the bearing inner hole (602), and the H surface where the large end surface (601) is located; Step S4: according to the number of conical ribs (12) of the hydrostatic bearing (6), with the center line OO of the bearing inner hole (602) as the reference, mark the conical ribs (12), the rectangular ribs (13) and the oil groove (9), mark the oil cavity boundary points A1, A2, A3, A4, A5, A6, A7, A8 on the surface of the bearing inner hole (602) corresponding to the position of the conical ribs (12), mark the transition points B1, B2, B3, B4, B5, B6, B7, B8 representing the connection between the oil groove (9) and the bearing inner hole (602), and mark the representative points C1, C2, C3, C4, C5, C6, C7, C8, C9 representing the structural features of the conical ribs (12) and the rectangular ribs (13) formed by the outer conical surface (604); Step S5: cutting out the structural features of the conical rib (12) and the rectangular rib (13) on the wire cutting machine according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9; cutting out the oil groove (9) according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8; during the wire cutting, a certain machining allowance is left for the diameter D1 of the connecting structure between the conical rib (12) and the rectangular rib (13), and the diameter D2 of the rectangular rib (13); Step S6: precision grinding the E surface of the outer conical surface (604) and the F surface of the small end surface (603) of the dynamic and static pressure bearing (6), and precision grinding the G surface of the bearing inner hole (602); Step S7: According to the number of the conical ribs (12) of the dynamic and static pressure bearing (6), the conical ribs (12), the rectangular ribs (13) and the oil groove (9) are marked with lines based on the center line OO of the bearing inner hole (602), and the large end surface (601) of the dynamic and static pressure bearing (6) is marked; Step S8: on the wire cutting machine, according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9, the structural features of the conical rib (12) and the rectangular rib (13) cut in step S5 are corrected; according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8, the oil groove (9) cut in step S5 is corrected so that the wall thickness consistency of the shaft diameters D2 and D1 relative to the bearing inner hole diameter D meets the process requirements.

2. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 1, characterized in that: In step S1, the specific method for processing the outer conical surface (604), the oil groove (11), the small end face (603) and the bearing inner hole (602) of the dynamic and static pressure bearing (6) is as follows: clamping the outer circle of the incoming material with a chuck, turning the outer conical surface (604) of the dynamic and static pressure bearing (6), leaving a processing allowance, and checking the contact working length of the outer conical surface (604) and the inner conical surface of the ring gauge by a coloring method; turning the oil groove (11) to size; turning the small end face (603) of the dynamic and static pressure bearing (6), leaving a processing allowance in the length direction; boring the bearing inner hole (602) of the dynamic and static pressure bearing (6), leaving a processing allowance; completing the above-mentioned processing in one clamping, ensuring the shape and position tolerance accuracy requirements of the outer conical surface (604), the small end face (603) and the bearing inner hole (602) process.

3. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 2, characterized in that: The specific method of step S3 is as follows: the large end face (601) of the dynamic and static pressure bearing (6) is fixed on the grinding clamp (15) by means of the threaded hole (18) through the connecting screw (14); the outer cylindrical surface of the grinding clamp (15) is clamped by a four-jaw chuck, and the outer conical surface (604) and the small end face (603) of the dynamic and static pressure bearing (6) are gauged, and the four jaws of the four-jaw chuck are adjusted so that the precision of the outer conical surface (604) and the small end face (603) meet certain requirements, and then the E surface of the outer conical surface (604) and the F surface of the small end face (603) are ground, leaving a grinding allowance, and the outer circle is checked by the coloring method. After the contact working length between the conical surface (604) and the inner conical surface of the ring gauge meets certain requirements, the G surface of the bearing inner hole (602) is ground so that the concentricity of the bearing inner hole (602) and the outer conical surface (604) and the surface roughness of the bearing inner hole (602) itself meet the process requirements of the process; with the small end surface (603) of the dynamic and static pressure bearing (6) as the reference F, the H surface where the large end surface (601) of the dynamic and static pressure bearing (6) is located is ground, leaving a grinding allowance so that the surface roughness of the large end surface (601) and the parallelism with the small end surface (603) meet the process requirements of the process.

4. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 3, characterized in that: In step S6, the dynamic and static pressure bearing (6) is fixed on the grinding clamping plate (15) by means of the connecting screw (14) and the threaded hole (18), the outer cylindrical surface of the grinding clamping plate (15) is clamped by a four-jaw chuck, the outer conical surface (604) and the small end surface (603) of the dynamic and static pressure bearing (6) are measured, and after the four jaws of the chuck are adjusted so that the precision of the outer conical surface (604) and the small end surface (603) meet certain requirements, the outer conical surface (604) and the small end surface (603) are precisely ground, leaving a grinding allowance, and the contact working length of the outer conical surface (604) and the inner conical surface of the ring gauge is checked by a coloring method. After meeting certain requirements, the bearing inner hole (602) is precisely ground, leaving a grinding allowance, so that the concentricity of the bearing inner hole (602) and the outer conical surface (604) and the surface roughness of the bearing inner hole (602) itself meet the process requirements of the process.

5. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 4, characterized in that: In step S7, the method of marking the large end surface (601) of the dynamic and static pressure bearing (6) is as follows: A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3, B4, B5, B6, B7, B8, C1, C2, C3, C4, C5, C6, C7, C8, C9 are used for marking, and A1, A2, A3, A4, A5, A6, A7, A8 correspond to the conical ribs ( 12) position oil cavity dividing points on the surface of the bearing inner hole (602), B1, B2, B3, B4, B5, B6, B7, B8 represent transition points where the oil groove (9) is connected to the bearing inner hole (602) of the dynamic and static pressure bearing (6), and C1, C2, C3, C4, C5, C6, C7, C8, C9 represent representative points where the outer conical surface (604) forms the structural features of the conical rib (12) and the rectangular rib (13).

6. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 1, characterized in that: After step S5 or step S8, add: Step S': performing aging treatment on the dynamic and static pressure bearing (6) to reduce residual stress.

7. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 1, characterized in that: Add after step S8: Step S9: grinding the large end surface (601) and the small end surface (603) of the dynamic and static pressure bearing (6) to improve the parallelism of the large end surface (601) and the small end surface (603); Step S10: measuring the small end surface (603) and the outer conical surface (604) of the dynamic and static pressure bearing (6), and ultra-precision grinding the outer conical surface (604); Step S11: measuring the small end surface (603) and the outer conical surface (604) of the dynamic and static pressure bearing (6), adjusting the installation accuracy, and then ultra-precision grinding the bearing inner hole (602) of the dynamic and static pressure bearing (6); Step S12: a sleeve (16) is placed on the outer cylindrical surface of the steel sleeve (4) and the entire assembly is placed on the V-shaped seat (17), the sleeve (16) is rotated, and the oil chamber depths of the oil chamber transition points B1, B2, B3, B4, B5, B6, B7, and B8 relative to the oil chamber boundary points A1, A2, A3, A4, A5, A6, A7, and A8 on both sides of the oil groove (9) are measured, and the oil chamber depth of point B3 relative to point A4 is h; the value of the oil chamber depth h of each oil chamber at each rotation of the sleeve (16) is recorded; by adjusting the distance of the left pressure cover (2) being screwed in and out along the Z1 direction, the position of the dynamic and static pressure bearing (6) relative to the steel sleeve (4) along the Z2 direction is changed, and the contact force between the conical rib (12) and the inner conical surface of the steel sleeve (4) is changed, and the value of the oil chamber depth h of each oil chamber at each rotation of the sleeve (16) is measured and recorded; Step S13: Processing the data of the oil cavity depth h of step S12 to obtain the consistency error between the oil wedge data; if the consistency error exceeds the design requirement, a scraping method is used to correct and reduce the consistency error; this step is repeated several times, and finally the oil cavity depth h of the dynamic and static pressure bearing (6) meets the consistency error design requirement.

8. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 7, characterized in that: In step S10, the dynamic and static pressure bearing (6) is fixed to the grinding clamp (15) by means of the threaded hole (18) through the connecting screw (14), and then the outer cylindrical surface of the grinding clamp (15) is clamped by a four-jaw chuck, and the small end face (603) and the outer conical surface (604) of the dynamic and static pressure bearing (6) are measured by meter, and the four jaws of the chuck are adjusted so that the outer conical surface (604) and the small end face (603) meet higher precision requirements, and the outer conical surface (604) is ultra-precision ground so that the size of the outer conical surface (604) is within the design tolerance range and the surface roughness meets the design requirements.

9. The method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing according to claim 7, characterized in that: In step S11, the dynamic and static pressure bearing (6) is installed into the steel sleeve (4), and a certain contact force is generated between the conical rib (12) of the dynamic and static pressure bearing (6) and the inner conical surface of the steel sleeve (4) by using the left pressure cover (2) through the left retaining ring (3), and the left retaining ring (3) is firmly sucked by the clamping permanent magnetic suction cup of the four-jaw chuck, so that the size of the bearing inner hole (602) is within the design tolerance range, and the roundness and surface roughness meet the design requirements.

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