Manufacturing method of multi-oil-wedge conical hybrid bearing

Abstract

The invention relates to a manufacturing method of a multi-oil-wedge conical hybrid bearing, and relates to the technical field of mechanical manufacturing of hybrid bearings. Firstly, the outer conical surface, the small end face and the inner hole of the bearing are machined through turning, boring and other methods; roughly grinding an outer conical surface, a small end surface and an inner hole by utilizing a grinding clamping plate, and flatly grinding a large end surface; then lineation is conducted, and conical rib plates, rectangular rib plates, oil grooves and other characteristics are machined through a linear cutting method; then accurately grinding the outer conical surface, the small end surface and the inner hole, and accurately grinding the large end surface; and then linear cutting is performed to correct the characteristics of conical rib plates, rectangular rib plates, oil grooves and the like. When the design precision requirement is high, the outer conical surface and the small end face of the bearing continue to be subjected to ultra-precision grinding, an inner hole of the bearing is subjected to ultra-precision grinding through the shaft system assembly, the oil cavity depth is measured, and scraping and correction are conducted. The process route is simple and clear, and the use requirement for high machining precision consistency of the multi-oil-wedge oil cavity of the conical hybrid bearing can be met.

Description

Technical Field

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

[0002] Bearings are one of the key basic parts that affect the machining accuracy of machine tools. The improvement of their rotation accuracy, vibration resistance and dynamic rigidity has received more and more attention. In addition to rolling bearings, a considerable number of machine tool spindles currently use hydrostatic sliding bearings or dynamic sliding bearings. In hydrostatic sliding bearings, when the oil supply system is started, the spindle and the bearing are in a liquid lubrication state, the bearing is less affected by the relative speed, the speed change has a wide range of application, and has the characteristics of long service life of parts and low starting power. The dynamic sliding bearing uses the pressure effect generated by the viscous fluid flowing into the wedge-shaped convergence gap. In the process from static, starting to stable operation, when the journal speed is low, the pressure effect is not enough to completely float the spindle, the journal and the bearing are in a non-liquid lubrication contact state of boundary film lubrication, and the journal rolls along the inner surface of the bearing, which will cause friction contact wear. The dynamic and static sliding bearing (abbreviated as dynamic and static pressure bearing) is a sliding bearing developed on the basis of dynamic and static sliding bearings. It combines the characteristics of dynamic and static sliding bearings and has been widely used in roll grinders.

[0003] Attached 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, and 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 lateral pressure on the dynamic and static pressure bearing 6 at the conical rib plate 12, forcing the inner hole of the dynamic and static pressure bearing 6 to deform inward at the position corresponding to the conical rib plate 12, and the rectangular rib plate 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, so that a plurality of wedge-shaped dynamic pressure cavities with different gaps are formed 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 5A wedge-shaped oil cavity A4B3 is given). CN103307105B discloses a dynamic and static pressure bearing for a high-speed roll grinder grinding head and a manufacturing method thereof. The manufacturing method is to add some specific structures to the structure of the dynamic and static pressure bearing according to the use requirements of the dynamic and static pressure bearing, but the specific manufacturing method of these parts and the added features is not given. Since the steel sleeve 4 is a continuous outer circle and inner cone surface, the difficulty of processing is relatively much smaller than that of the dynamic and static pressure bearing 6.

[0004] Under the above research background, 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 special 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 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 surface, large end surface and inner hole of the dynamic and static pressure bearing;

[0008] Step S2: according to the number of conical ribs designed for the dynamic and static pressure bearing, the same number of threaded holes are processed 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 inner hole of the bearing, and the H surface where the large end surface is located;

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

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

[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 hydrostatic bearing, the conical ribs, the rectangular ribs and the oil grooves are marked with the center line OO of the inner hole of the bearing, and the large end surface of the hydrostatic bearing is marked;

[0014] Step S8: According to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9 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 B1, B2, B3, B4, B5, B6, B7, and B8, the oil grooves cut in step S5 are 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.

[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 coloring 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 inner hole of the dynamic and static pressure bearing, leaving a processing allowance; complete the above-mentioned processing in one clamping to ensure the shape 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 plate by connecting screws through threaded holes; clamping the outer cylindrical surface of the grinding clamp plate by a four-jaw chuck, marking the outer conical surface and 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 inner hole of the bearing after meeting certain requirements, 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 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 hydrostatic and dynamic 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 surface of the hydrostatic and dynamic pressure bearings are measured, the four jaws of the chuck are adjusted so that the accuracy of the outer conical surface and the small end surface meets certain requirements, the outer conical surface and the small end surface are precisely 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 color coating method. After meeting certain requirements, the inner hole of the bearing is precisely 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 the process.

[0018] Further, 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 dividing 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, C1, C2, C3, C4, C5, C6, C7, C8, C9 represent the representative points of the structural features of the tapered rib and the rectangular rib formed by the outer conical surface.

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

[0020] Furthermore, after step S8, add:

[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, measure the oil cavity depth of each oil cavity transition point B1, B2, B3, B4, B5, B6, B7, B8 relative to the oil cavity demarcation points A1, A2, A3, A4, A5, A6, A7, A8 on both sides of the oil groove 9, the oil cavity depth of point B3 relative to point A4 is h; record the value of each oil cavity depth h at each rotation of the outer sleeve 16; by adjusting the distance of the left gland 2 being screwed in and out 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, change the contact force between the conical rib 12 and the inner cone surface of the steel sleeve 4, measure and record the value of each oil cavity depth h at each rotation of the outer sleeve 16;

[0025] Step S13: Process the data of the oil chamber 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 many times, and finally the oil chamber depth h of the dynamic and static pressure bearing 6 meets the consistency error design requirement.

[0026] Furthermore, in step S10, the static and dynamic pressure bearings are fixed on the grinding plate by connecting screws through 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 static and dynamic 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 pressure bearings are installed into the steel sleeve, and a certain contact force is generated between the conical ribs of the hydrostatic and dynamic pressure bearings and the inner conical surface of the steel sleeve through the left pressure cover and the left retaining ring, 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 multi-oil wedge conical dynamic and static pressure bearing manufacturing method of the present invention uses the inner hole of the bearing and the outer conical surface of the conical rib plate as mutual references, based on the processing route of the typical surface of the mechanical manufacturing process specification, and continuously improves the concentricity between the inner hole of the bearing and the outer conical surface and the verticality of the bearing end face and the inner hole of the bearing through rough grinding, fine grinding and super fine grinding; using the inner hole of the bearing after the rough grinding as the reference, marking the conical rib plate, the rectangular rib plate and the oil groove, and processing the conical rib plate, the rectangular rib plate and the oil groove by the wire cutting method, so that the multiple groups of rectangular rib plates and the oil groove between the two conical rib plates have high structural symmetry, size consistency and consistency of shape and position error accuracy relative to the inner hole of the bearing; by installing the processed bearing into the steel sleeve of the shaft system assembly, adjusting the axial position of the dynamic and static pressure bearing by using the pressure cover, and judging the consistency of the oil cavity depth by measuring the size of the depth 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 dynamic pressure wedge oil cavity depth is corrected by scraping. Through the above-mentioned various processing strategies, high-precision processing of the dynamic and static pressure bearing is achieved. The 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 bearing. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0032] Figure 3 It 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 a multi-oil wedge structure of a dynamic and static pressure bearing according to the present invention;

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

[0035] Figure 6 It is a schematic diagram of the axial position when the shaft system component 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 the shaft system component 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.

[0037] In the figure: 1-spindle; 2-left pressure cover; 3-left retaining ring; 4-steel sleeve; 5-body shell; 6-dynamic and static pressure bearings; 7-right pressure cover; 8-right retaining ring; 9-oil groove; 10-oil inlet hole; 11-oil groove; 12-conical rib plate; 13-rectangular rib plate; 14-connecting screw; 15-grinding clamp plate; 16-jacket; 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 technical solutions in the embodiments of the present invention are described clearly and completely below. 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 creative work 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 comprising 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 the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0041] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0042] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] Aiming at the structure of the dynamic and static pressure bearing, the present invention provides a method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing. Based on the processing route of typical surfaces in the mechanical manufacturing process regulations and the positioning reference selection principle, 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 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; a complete set of technical solutions is used to solve the technical difficulties in the precision manufacturing of multi-oil wedge tapered dynamic and static pressure bearings.

[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: machining 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, boring the bearing inner hole 602 of the dynamic and static pressure bearing 6, leaving a machining allowance to ensure the shape and position 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 processed 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 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, and the four jaws of the four-jaw chuck are adjusted so that the runout error 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, 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, the conical ribs 12, the rectangular ribs 13 and the oil grooves 9 are marked with lines based on the center line OO of the bearing inner hole 602, the oil cavity dividing 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 are marked, 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 are marked, and 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 are marked;

[0049] Step S5: cutting out the conical rib 12 and the rectangular rib 13 and other structural features according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8, and C9 on the wire cutting machine; cutting out the oil groove 9 according to the motion trajectories of B1, B2, B3, B4, B5, B6, B7, and B8; leaving a certain machining allowance 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 during wire cutting;

[0050] Step S6: fix the dynamic and static pressure bearing 6 on the grinding clamping plate 15 by means of the connecting screws 14 and 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 between the outer conical surface 604 and the inner conical surface of the ring gauge by a coloring method, and then precisely grind the G surface of the bearing inner hole 602 after the requirements are met, 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;

[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 demarcation points on the surface of the bearing inner hole 602 at the position of the conical 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 the representative points of the structural features such as the conical rib 12 and the rectangular rib 13 formed by the outer conical surface 604;

[0052] Step S8: Correct the conical ribs 12 and rectangular ribs 13 and other structural features cut in step S5 according to the motion trajectories of C1, C2, C3, C4, C5, C6, C7, C8 and C9 on the wire cutting machine; correct the oil grooves 9 cut in step S5 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 dynamic and static pressure bearing 6 during the wire cutting process, after implementing step S5 or step S8, the following steps are added:

[0054] Step S′: Perform 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 face 601 and the small end face 603 of the dynamic and static pressure bearing 6, so that the parallelism accuracy of the large end face 601 and the small end face 603 is further improved;

[0057] Step S10: Figure 3 As shown, the dynamic and static pressure bearing 6 is fixed on the grinding clamping plate 15 by connecting screws 14 relying on threaded holes 18, and then the outer cylindrical surface of the grinding clamping plate 15 is clamped by a four-jaw chuck, and the outer conical surface 604 and the small end surface 603 are measured by a meter. After the four jaws of the chuck are adjusted so that the runout errors of the outer conical surface 604 and the small end surface 603 meet 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 the left pressure cover 2 is used to generate a certain contact force between the conical rib 12 of the dynamic and static pressure bearing 6 and the inner conical surface of the steel sleeve 4 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, and the runout error of the outer conical surface 604 is corrected. After meeting certain requirements, the inner hole 602 of the bearing is ultra-precision ground to improve the roundness, surface roughness and other processing accuracy of the inner hole 602 of the bearing;

[0059] Step S12: Press Figure 7 As shown, a sleeve 16 is sleeved on the outer cylindrical surface of the steel sleeve 4 and the entire assembly is placed on a V-shaped seat 17. The 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 in the figure, the oil cavity depth of point B3 relative to point A4 is h; record the value of the oil cavity depth h of 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 The position in the Z2 direction shown is used to change the contact force between the conical rib 12 and the inner conical surface of the steel sleeve 4, 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 chamber 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 many times, and finally the oil chamber depth h of the dynamic and static pressure bearing 6 meets the consistency error design requirement.

[0061] The multi-oil wedge conical dynamic and static pressure bearing manufacturing method of the present invention uses the inner hole of the bearing and the outer conical surface of the conical rib plate as mutual references, based on the processing route of the typical surface of the mechanical manufacturing process specification, and 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; using the inner hole of the bearing after the rough grinding as the reference, marking the conical rib plate, the rectangular rib plate and the oil groove, and processing the conical rib plate, the rectangular rib plate and the oil groove by the wire cutting method, so that the multiple groups of rectangular rib plates and the oil groove between the two conical rib plates have high structural symmetry, size consistency and consistency of shape and position error accuracy relative to the inner hole of the bearing; by installing the processed bearing into the steel sleeve of the shaft system assembly, adjusting the axial position of the dynamic and static pressure bearing by using the pressure cover, and judging the consistency of the oil cavity depth by measuring the depth 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 dynamic pressure wedge oil cavity depth is corrected by scraping. Through the above-mentioned various processing strategies, high-precision processing of the dynamic and static pressure bearing is achieved. The 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 bearing.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight 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), the oil groove (11), the small end surface (603), the large end surface (601) and the inner hole (602) of the dynamic and static pressure bearing (6); 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 processed on the large end surface (601) of the hydrostatic and dynamic 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), the conical ribs (12), the rectangular ribs (13) and the oil grooves (9) are marked with lines based on the center line OO of the bearing inner hole (602), and 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) are marked, and 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) are marked, and 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) are marked; 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 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 inner hole (602) of the bearing; Step S7: According to the number of the conical ribs (12) of the hydrostatic bearing (6), the conical ribs (12), the rectangular ribs (13) and the oil grooves (9) are marked with lines based on the center line OO of the inner hole (602) of the bearing, and the large end surface (601) of the hydrostatic 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 inner hole diameter D of the bearing 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 surface (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 between 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 surface (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 to ensure the shape and position tolerance accuracy requirements of the outer conical surface (604), the small end surface (603) and the bearing inner hole (602) of the process.

3. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in claim 2, characterized in that: The specific method of step S3 is: fixing the large end face (601) of the dynamic and static pressure bearing (6) on the grinding clamp (15) by means of the connecting screw (14) and the threaded hole (18); clamping the outer cylindrical surface of the grinding clamp (15) by means of a four-jaw chuck, marking the outer conical surface (604) and the small end face (603) of the dynamic and static pressure bearing (6), adjusting the four jaws of the four-jaw chuck so that the precision of the outer conical surface (604) and the small end face (603) meet certain requirements, grinding the E surface of the outer conical surface (604) and the F surface of the small end face (603), leaving a grinding allowance, and checking the outer circle 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) 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. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in claim 3, characterized in that: In step S6, the dynamic and static pressure bearing (6) is fixed on the grinding clamp (15) by means of the connecting screw (14) and the threaded hole (18), 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 surface (603) of the dynamic and static pressure bearing (6) are measured by metering, and 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, and then the outer conical surface (604) and the small end surface (603) are precisely ground, leaving a grinding allowance, and the contact working length between 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 inner hole (602) of the bearing is precisely ground, leaving a grinding allowance, so that the concentricity of the inner hole (602) of the bearing and the outer conical surface (604) and the surface roughness of the inner hole (602) of the bearing meet the process requirements of the process.

5. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in 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: 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 corresponding to the conical rib ( 12) represents the oil cavity dividing point on the surface of the bearing inner hole (602), 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 dynamic and static pressure bearing (6), and C1, C2, C3, C4, C5, C6, C7, C8, C9 represent the representative points of the structural features of the conical rib (12) and the rectangular rib (13) formed by the outer conical surface (604).

6. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in 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. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in claim 1, characterized in that: After step S8 add: 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: an outer sleeve (16) is sleeved on the outer cylindrical surface of the steel sleeve (4) and the entire assembly is placed on a V-shaped seat (17), the outer 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 depth h of each oil chamber at each rotation of the outer 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 plate (12) and the inner conical surface of the steel sleeve (4) is changed, and the value of the depth h of each oil chamber at each rotation of the outer sleeve (16) is measured and recorded; Step S13: Processing the data of the depth h of each oil cavity in step S12 to obtain the consistency error between the data of each oil wedge; 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. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in claim 7, characterized in that: In step S10, the static and dynamic pressure bearing (6) is fixed on the grinding plate (15) by means of the connecting screws (14) and the threaded holes (18), and then the outer cylindrical surface of the grinding plate (15) is clamped by a four-jaw chuck, and the small end face (603) and the outer conical surface (604) of the static and dynamic pressure bearing (6) are measured, 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. A method for manufacturing a multi-oil wedge tapered dynamic and static pressure bearing as claimed in claim 7, characterized in that: In step S11, the hydrostatic bearing (6) is installed into the steel sleeve (4), and a certain contact force is generated between the conical rib (12) of the hydrostatic 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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