A polishing device and polishing method based on magnetorheological fluid

Abstract

The present invention relates to the field of mechanical processing technology and is a magnetorheological polishing device and a polishing method based on the polishing device. The polishing device includes a support turntable, a laser heating module, a magnetorheological fluid supply assembly, and a sleeve structure movably disposed above the support turntable. The support turntable and the sleeve structure together form a mounting cavity for placing a workpiece. The inner wall of the sleeve structure is used to form a magnetorheological fluid channel with the surface to be polished of the workpiece. The sleeve structure is provided with a magnetic module to form a magnetic field. The magnetorheological fluid supply assembly is used to supply magnetorheological fluid to the magnetorheological fluid channel so that the magnetorheological fluid polishes the surface to be polished of the workpiece under the action of the magnetic field. The laser heating module is disposed on one side of the preset mounting cavity for heating the surface to be polished of the workpiece before polishing. The present invention heats and softens the surface to be polished of the workpiece before magnetorheological processing, making it easier to remove material from the workpiece surface and improving polishing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and in particular to a polishing device and a polishing method based on magnetorheological fluid. Background Art

[0002] Bearings are the core transmission components of mechanical equipment, and their surface quality directly affects the performance of the equipment. The main polishing surfaces of the outer surface of the bearing inner ring include the cylindrical surface, groove, and rib. Currently, they are mainly polished in sequence by grinding, which has a low overall processing efficiency. The groove is its main working surface and is usually ultra-precision ground with an oilstone. However, with the development of the bearing industry, more and more curved surfaces are used for groove profiles, such as spiral logarithmic curves. For such complex profile surfaces, ultra-precision grinding is very difficult. Due to its narrow width, the rib is prone to interference during ordinary machining, and machining such as grinding is prone to mechanical damage such as cut marks and cracks.

[0003] To this end, some scholars have proposed the use of magnetorheological processing to perform precision polishing on bearing inner rings or other parts with complex external surface structures. As a flexible processing method, magnetorheological processing has a small processing force and can remove surface material without causing surface and sub-surface damage. Its working principle is that the magnetorheological fluid instantly forms a flexible polishing head with a certain intensity of magnetic clusters under the action of a magnetic field, which performs ultra-precision processing on the outer surface of the workpiece. Since magnetorheological fluid is a liquid, it has good adaptability to the processing surface structure and can polish bearing inner rings or other parts with complex external surface structures. Magnetorheological fluid can also cool the processed surface while removing surface material, but magnetorheological polishing has a low removal efficiency due to its small processing force. Summary of the Invention

[0004] The purpose of the present invention is to provide a polishing device and polishing method based on magnetorheological fluid to solve the above-mentioned problems that the existing processing devices are difficult to process the outer surface of the bearing inner ring and the magnetorheological polishing efficiency is low.

[0005] To achieve the above objectives, the technical solutions of the present invention include:

[0006] A polishing device based on magnetorheology includes a supporting turntable, a laser heating module, a magnetorheological fluid supply assembly, and a sleeve structure movably arranged above the supporting turntable. The supporting turntable and the sleeve structure together form an installation cavity for placing a workpiece. The inner wall of the sleeve structure is used to form a magnetorheological fluid channel with the surface to be polished of the workpiece. The sleeve structure is provided with a magnetic module to form a magnetic field. The magnetorheological fluid supply assembly is used to supply magnetorheological fluid to the magnetorheological fluid channel so that the magnetorheological fluid polishes the surface to be polished of the workpiece under the action of the magnetic field. The laser heating module is arranged on one side of the preset installation cavity and is used to heat the surface to be polished of the workpiece before the polishing process.

[0007] In one embodiment, the sleeve structure is further provided with an ultraviolet catalytic module, which is used to emit ultraviolet light to the magnetorheological fluid channel to catalyze the magnetorheological fluid, wherein the magnetorheological fluid contains magnetic abrasive particles, photosensitive material nano-titanium dioxide (TiO2), hydrogen peroxide (H2O2) and water; and / or;

[0008] The magnetic module is a magnet made of conductive and magnetic material and is also provided with a power supply. The positive pole of the power supply is used to electrically connect to the workpiece, and the negative pole of the power supply is electrically connected to the magnet. Thus, the magnet, the workpiece and the magnetorheological fluid form an electrolytic cell, and the magnetorheological fluid contains magnetic abrasive particles and conductive ions.

[0009] In one embodiment, the ultraviolet photocatalytic module includes an ultraviolet light source and a protective cover. The protective cover and the magnetic module are spliced ​​in the annular direction of the sleeve structure to form the sleeve structure. The side wall of the protective cover facing the magnetorheological fluid channel is made of transparent or translucent material. The ultraviolet light source is arranged on the protective cover and emits ultraviolet light to the magnetorheological fluid channel through the side wall of the protective cover; the conductive ions are Na+ or K+.

[0010] In one embodiment, the magnetorheological fluid supply assembly includes a magnetorheological fluid container, which is used to store the magnetorheological fluid. The magnetorheological fluid container is provided with a vibration module located on the outside and / or a stirring blade located on the inside.

[0011] In one embodiment, the magnetorheological fluid container is provided with a vibration module located on its outside and a stirring blade located on its inside. The vibration module is a plurality of ultrasonic vibration modules respectively arranged at the bottom and side of the magnetorheological fluid container. The stirring blade has multiple stirring blades respectively arranged at the bottom and side of the magnetorheological fluid container, and the stirring blades and the ultrasonic vibration modules are arranged correspondingly.

[0012] In one embodiment, the magnetorheological fluid container is arranged below the support turntable, and the support turntable is provided with a slurry return hole so that the magnetorheological fluid in the magnetorheological fluid channel can flow back to the magnetorheological fluid container; the outer edge of the support turntable is provided with an annular protrusion so that the support turntable forms a cache tank for temporarily storing the magnetorheological fluid, and the slurry return hole is provided in the cache tank.

[0013] In one embodiment, the rotation axis direction of the supporting turntable is defined as the Y-axis direction, the laser heating module has relative movement relative to the supporting turntable, namely translation along the Y-axis direction and rotation around the Y-axis direction, and the sleeve structure is movably arranged above the supporting turntable in a manner of translation along the Y-axis direction and rotation around the Y-axis direction.

[0014] In one embodiment, the workpiece is an inner ring of a bearing, a connecting piece is provided at the rotating shaft of the supporting turntable, and an end cover is also provided. The end cover is connected to the supporting turntable through the connecting piece, and the end cover is used to press on top of the inner ring of the bearing and press the inner ring of the bearing by being connected to the supporting turntable.

[0015] The technical solution of the present invention also includes:

[0016] A polishing method based on magnetorheological fluid, the polishing method is based on the above-mentioned polishing device, and the operating steps of the polishing method include:

[0017] S1, placing a workpiece on a supporting turntable, and starting a laser heating device to perform laser heating on the surface to be polished of the workpiece to soften the surface to be polished;

[0018] S2. The sleeve structure moves onto the supporting turntable and is sleeved outside the workpiece to form a magnetorheological fluid channel, and the magnetic module forms a magnetic field in the magnetorheological fluid channel;

[0019] S3. The magnetorheological fluid supply assembly supplies magnetorheological fluid to the magnetorheological fluid channel, so that the magnetorheological fluid moves relative to the workpiece under a magnetic field environment to polish the surface to be polished of the workpiece.

[0020] In one embodiment, the sleeve structure is fixedly connected to the connecting turntable, the rotation axis direction of the supporting turntable is defined as the Y-axis direction, and the connecting turntable moves relative to the supporting turntable in a manner of translation along the Y-axis direction and rotation around the Y-axis direction;

[0021] In step S2, the connecting turntable translates along the Y-axis direction to drive the sleeve structure to translate and be sleeved outside the workpiece;

[0022] It also includes an electrolytic cell and / or an ultraviolet catalytic module arranged on one side of the magnetorheological fluid channel, and the magnetorheological fluid is the electrolyte of the electrolytic cell;

[0023] In step S3, the electrolytic cell generates an electrolytic reaction and / or the ultraviolet catalytic module emits ultraviolet light to the magnetorheological fluid channel, and the connecting turntable and the supporting turntable rotate synchronously in opposite directions around the Y-axis direction.

[0024] The beneficial effects of the present invention are as follows: the present invention combines laser heating and magnetorheological processing, and heats and softens the surface to be polished of the workpiece before magnetorheological processing, so that the material on the surface of the workpiece is easier to remove, thereby improving the efficiency of polishing; secondly, since the magnetorheological fluid is a liquid, the magnetorheological fluid has a high degree of adaptability to the surface structure to be polished, and can adapt to the polishing of parts with complex surfaces to be polished, such as the outer surface of the inner ring of the bearing. Compared with the traditional method of grinding the cylindrical surface, groove and rib of the inner ring of the bearing separately, it has the characteristics of good flexibility, which can adapt to the polishing of complex groove surfaces and can precisely polish the ribs without interference; in addition, the polishing process combines the synergistic effects of multiple energy fields such as ultraviolet catalytic oxidation, electrolytic dissolution and magnetic flexible grinding. The slurry has magnetic abrasives, conductive ions, photosensitive ions and oxidants, which can effectively conduct the coupling between composite energy fields such as magnetic, electrolytic, chemical and mechanical fields, thereby significantly improving the processing quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of laser heating according to an embodiment of the present invention.

[0026] Figure 2 Schematic diagram of magnetorheological polishing according to an embodiment of the present invention, wherein black dots represent magnetorheological fluid.

[0027] Among them: F magnetorheological fluid channel, 1 supporting turntable, 11 slurry return hole, 12 annular protrusion, 2 laser heating module, 3 magnetic module, 41 connecting piece, 42 end cover, 5 ultraviolet photocatalytic module, 51 protective cover, 52 ultraviolet light source, 6 power supply, 71 magnetorheological fluid container, 72 vibration module, 73 stirring blade, 74 pump, 75 filter screen, 8 connecting turntable, 81 slurry inlet hole, 100 bearing inner ring, 100a cylindrical surface, 100b channel, 100c rib. DETAILED DESCRIPTION

[0028] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0029] See Figure 1 and Figure 2 As shown, the present invention discloses a polishing device based on magnetorheology, including a supporting turntable 1, a laser heating module 2, a magnetorheological fluid supply assembly and a sleeve structure movably arranged above the supporting turntable 1, the supporting turntable 1 and the sleeve structure together form an installation cavity for placing a workpiece, the inner wall of the sleeve structure is used to form a magnetorheological fluid channel F with the surface to be polished of the workpiece, the sleeve structure is provided with a magnetic module 3 to form a magnetic field, the magnetorheological fluid supply assembly is used to supply magnetorheological fluid to the magnetorheological fluid channel F so that the magnetorheological fluid polishes the surface to be polished of the workpiece under the action of the magnetic field, and the laser heating module 2 is arranged on one side of the installation cavity for heating the surface to be polished of the workpiece before polishing.

[0030] The present invention combines laser heating and magnetorheological processing. Before magnetorheological processing, the surface of the workpiece to be polished is heated and softened, so that the material on the workpiece surface is easier to remove, thereby improving the polishing efficiency.

[0031] The workpiece in this embodiment is a bearing inner ring 100, whose annular outer surface is the surface to be polished. In other embodiments, the workpiece to be polished can also be other types of parts that require precision polishing, especially shafts or rings with annular surfaces to be polished. The surface to be polished and the inner wall of the sleeve structure form an annular magnetorheological fluid channel.

[0032] Since magnetorheological fluid is a liquid, it has a high degree of adaptability to the surface structure to be polished and can adapt to the polishing of parts with complex surfaces to be polished, such as the outer surface of the bearing inner ring. Compared with the traditional method of grinding the cylindrical surface 100a, the groove 100b, and the rib 100c of the bearing inner ring 100 separately, it has the characteristics of good flexibility, can adapt to the polishing of complex groove surfaces, can precisely polish the rib, and can polish the cylindrical surface 100a, the groove 100b, the rib 100c and other structures on the outer surface of the bearing inner ring 100 at the same time, thereby improving the polishing efficiency.

[0033] The rotational axis of the support turntable 1 is defined as the Y-axis. The laser heating module 2 has relative motion relative to the support turntable 1, capable of both translational movement along the Y-axis and rotational movement about the Y-axis. In this embodiment, the laser heating module 2 is fixed, and the support turntable 1 is connected to a support turntable drive mechanism (not shown in the figure) that enables the support turntable 1 to rotate about the Y-axis. The laser heating module 2 is connected to a laser drive mechanism (not shown in the figure). Driven by the laser drive mechanism, the laser heating module 2 can translate along the Y-axis. Thus, by virtue of the rotation of the support turntable 1 and the elevation of the laser heating module 2, the laser heating module 2 can fully irradiate and heat the surface to be polished of the bearing inner ring 100. The sleeve structure is movably disposed above the support turntable 1 in a manner that translates along the Y-axis. This allows the sleeve structure to expose the outer surface of the bearing inner ring 100 at a higher position relative to the support turntable 1, allowing the laser heating module 2 to emit laser light from the outside of the bearing inner ring 100 to heat the surface to be polished. In addition, in order to adapt to workpieces of different structures and sizes, the laser heating module 2 can also translate in the radial direction of the sleeve structure to adjust the distance between the laser heating module 2 and the surface to be polished to obtain a better heating effect.

[0034] To secure the bearing inner ring 100 to the support turntable 1, a connector 41 is provided at the rotating shaft of the support turntable 1. The connector 41 also includes an end cap 42, which is connected to the support turntable 1 via the connector 41. The end cap 42 is used to press against the bearing inner ring 100 and, through connection to the support turntable 1, to compress the bearing inner ring 100. In this embodiment, the connector 41 is a bolt and nut assembly. The head of the bolt is fixed to the support turntable 1 by welding or other means. The threaded section of the bolt passes through the central through-hole of the end cap 42. The end cap 42 presses against the bearing inner ring 100, and a nut is threaded onto the bolt at its central axis, thereby pressing the bearing inner ring 100 against the support turntable 1. Furthermore, to prevent the bolt and nut from protruding excessively from the end cap and thus affecting the subsequent movement of the sleeve structure, a groove is provided in the middle of the end cap 42, which is inserted into the interior of the bearing inner ring 100.

[0035] The sleeve structure is formed by splicing a semi-annular magnetic module 3 and a semi-annular protective cover 51 in the circumferential direction of the sleeve structure. The protective cover 51 is provided with a UV light source 52. The sidewall of the protective cover 51 facing the magnetorheological fluid channel F is made of a transparent or translucent material, so that the UV light source 52 can pass through the sidewall and illuminate the magnetorheological fluid in the magnetorheological fluid channel F. The protective cover 51 can be made entirely of a transparent or translucent material, or only the sidewall facing the magnetorheological fluid channel F can be made of a transparent or translucent material, while the remaining sidewalls are made of an opaque material.

[0036] The protective cover 51 and the ultraviolet light source 52 form an ultraviolet catalytic module 5. The ultraviolet catalytic module 5 is arranged on one side of the magnetorheological fluid channel F. The ultraviolet light emitted by the ultraviolet light source 52 irradiates the magnetorheological fluid channel F to catalyze the magnetorheological fluid. The magnetorheological fluid contains magnetic abrasive particles, photosensitive material nano titanium dioxide (TiO2), conductive ions Na + or K + , hydrogen peroxide (H2O2) and water. This magnetorheological fluid does not contain highly corrosive reagents and is environmentally friendly and human-friendly. The TiO2 contained therein easily absorbs ultraviolet light, generating highly oxidizing hole-electron pairs. The holes react with H2O2 and water to form hydroxyl radicals (·OH) with a strong oxidizing potential, thereby accelerating the formation of an oxide layer on the workpiece surface. The magnetic abrasive particles can be adsorbed on the magnetic module 3 to form a flexible grinding head, mechanically removing material from the workpiece surface to achieve the purpose of polishing. The oxide layer on the workpiece surface is more easily removed and detached under the action of mechanical friction. Compared with the unoxidized bearing inner ring, the oxidation of the surface facilitates the flexible grinding head to more quickly remove the material from the surface to be polished of the bearing inner ring 100, thereby improving the efficiency of magnetorheological processing.

[0037] The magnetic module 3 is a magnet made of a conductive and magnetic material, more specifically, a permanent magnet made of a conductive and magnetic material. The material of the magnetic module 3 can be selected from an aluminum-nickel-cobalt permanent magnet alloy or an iron-chromium-cobalt permanent magnet alloy, or other permanent magnet materials with conductive functions. The magnetic module 3 made of permanent magnet material can form a magnetic field in the magnetorheological fluid channel F, so that the magnetorheological fluid processes the surface of the workpiece in a magnetic field environment to polish the surface to be polished. However, the magnetic module 3 is not limited to a permanent magnet and can also be made of a soft magnetic material. The magnetic field is formed by magnetizing the magnetic module 3 made of the soft magnetic material through an energized coil.

[0038] The magnetic module 3 of this embodiment is a permanent magnet made of conductive and magnetic materials. The magnetic module 3 is connected to the negative pole of the power supply 6, and the positive pole of the power supply 6 is electrically connected to the bearing inner ring 100, so that the magnetic module 3, the bearing inner ring 100 and the magnetorheological fluid form an electrolytic cell. + ions or K + The presence of conductive ions such as ions makes the slurry conductive. Under the action of power supply 6, the magnetic module 3, the bearing inner ring 100, and the slurry form an electrolytic cell, with the magnetic module 3 acting as the cathode and the bearing inner ring 100 as the anode. This facilitates the dissolution of the surface material of the bearing inner ring 100. The metal ions dissolved in the magnetorheological fluid are easily attracted by the magnetic force and reduced to a single substance at the cathode. This setting not only accelerates the electrolysis but also effectively reduces the concentration of metal ions in the magnetorheological fluid, reducing pollution. Furthermore, the electrons generated in the photocatalysis gather at the cathode, away from the holes, preventing the two from recombining, ensuring the concentration of holes, thereby promoting the formation of the oxide layer and improving polishing efficiency.

[0039] The contour of the magnetic module 3 is coupled with the contour of the surface to be polished of the bearing inner ring 100, so that the distance between the magnetic module 3 and the bearing inner ring 100 is relatively uniform along the axial direction of the bearing inner ring 100 (i.e., the Y-axis direction), which is conducive to uniform polishing of the bearing inner ring 100.

[0040] The magnetorheological fluid supply assembly includes a magnetorheological fluid container 71, which is used to store magnetorheological fluid. The magnetorheological fluid container 71 is provided with a vibration module 72 located on its outside and a stirring blade 73 located on its inside. The vibration module 72 is a plurality of ultrasonic vibration modules respectively arranged at the bottom and sides of the magnetorheological fluid container 71. The stirring blade 73 is provided in plurality and is respectively arranged at the bottom and sides of the magnetorheological fluid container 71. The stirring blade 73 and the ultrasonic vibration module are arranged in correspondence. The ultrasonic vibration of the vibration module 72 can generate mechanical vibrations in the magnetorheological fluid container 71, vibrating the magnetorheological fluid in the magnetorheological fluid container 71 and improving its uniformity. The stirring blade 73 can stir the magnetorheological fluid in the magnetorheological fluid container 71, further improving the uniformity of the magnetorheological fluid. However, it should be noted that the vibration module 72 and the stirring blade 73 do not have to be set on both the inner and outer sides of the magnetorheological fluid container 71 at the same time. Only setting the vibration module 72 or the stirring blade 73 can also achieve the effect of improving the uniformity of the magnetorheological fluid. In this embodiment, the vibration module 72 and the stirring blade 73 are set at the same time, and the two cooperate to further improve the uniformity of the magnetorheological fluid.

[0041] The magnetorheological fluid supply assembly also includes a pump 74, which is used to supply magnetorheological fluid from the magnetorheological fluid container 71 to the magnetorheological fluid channel F. The magnetic module 3 and protective cover 51, forming a sleeve structure, are bolted to the connecting turntable 8. The connecting turntable 8 has a slurry inlet 81. Under the pumping action of the pump 74, the magnetorheological fluid enters the magnetorheological fluid channel F through the slurry inlet 81. The magnetorheological fluid container 71 is located below the support turntable 1. The support turntable 1 has a slurry return hole 11 to allow the magnetorheological fluid in the magnetorheological fluid channel F to flow back to the magnetorheological fluid container 71. This allows the magnetorheological fluid to flow from top to bottom, making the flow smoother. The magnetorheological fluid can also flow directly back to the magnetorheological fluid container 71 through the slurry return hole 11, eliminating the need for additional pipes or other structures to form a closed loop for the magnetorheological fluid. An annular protrusion 12 is provided on the outer edge of the support turntable 1 so that the support turntable 1 forms a cache tank for temporarily storing magnetorheological fluid to prevent the magnetorheological fluid from overflowing. A slurry return hole 11 is provided in the cache tank so that the magnetorheological fluid in the cache tank can flow back to the magnetorheological fluid container 71.

[0042] The connecting turntable 8 is connected to a connecting turntable drive mechanism (not shown in the figure). The connecting turntable drive mechanism enables the connecting turntable 8 to translate along the Y-axis and rotate about the Y-axis, thereby enabling the connecting turntable 8 to move up and down relative to the supporting turntable 1. It can also rotate synchronously with the supporting turntable 1, driving the sleeve structure to translate along the Y-axis and rotate about the Y-axis. Among them, the supporting turntable drive mechanism, laser drive mechanism, and connecting turntable drive mechanism are existing technologies. Their specific structures are determined by those skilled in the art based on actual conditions and will not be described in detail here.

[0043] The magnetorheological fluid container 71 is a barrel-shaped container with an open top. A filter 75 is provided on the top of the container to filter the magnetorheological fluid containing impurities from the magnetorheological fluid channel F.

[0044] The sleeve structure of the above embodiment is formed by splicing a semi-annular magnetic module 3 and a semi-annular protective cover 51, but the sleeve structure is not limited to this. In other embodiments, the magnetic module 3 and the protective cover 51 are spliced ​​in the circumferential direction of the sleeve structure, but the semi-annular shape is not formed at a central angle of 180°. For example, the sleeve structure can be a separate sleeve-like component, and the magnetic module 3 is embedded in the sleeve.

[0045] The present invention also proposes a polishing method based on magnetorheological fluid, which is based on the above-mentioned polishing device. The operating steps of the polishing method include:

[0046] S1. Place the workpiece on the supporting turntable and start the laser heating device to perform laser heating on the surface to be polished of the workpiece to soften the surface to be polished.

[0047] More specifically, see Figure 1 As shown, the large end of the bearing inner ring 100 is facing downward, and the connector 41 formed by the bolt and nut assembly is matched with the end cover 42 to fix it on the supporting turntable 1; the laser heating module 2 scans and heats the surface of the bearing inner ring 100 from top to bottom in sequence, and the laser scanning direction is always maintained along the normal direction of the surface of the bearing inner ring 100. During the scanning process, the laser heating module 2 moves downward one step every time the bearing inner ring 100 rotates one circle until the surface to be polished of the bearing inner ring 100 is completely scanned, so that its surface is modified to form a softened molten layer.

[0048] S2, magnetic loading, see Figure 2 As shown, the connecting turntable 8 drives the sleeve structure to move downward along the Y-axis to the supporting turntable 1 and is sleeved outside the bearing inner ring 100 to form a magnetorheological fluid channel F. The magnetic module 3 generates a magnetic field in the magnetorheological fluid channel F. At this time, the bottom end of the magnetic module 3 and the protective cover 41 are close to the rib 100c of the bearing inner ring 100.

[0049] S3. The magnetorheological fluid supply assembly supplies magnetorheological fluid to the magnetorheological fluid channel F, causing the magnetorheological fluid to move relative to the workpiece in a magnetic field environment and polish the surface to be polished of the bearing inner ring 100. Simultaneously, an electrolytic reaction occurs in the electrolytic cell, and the ultraviolet catalytic module 5 emits ultraviolet light into the magnetorheological fluid channel F. More specifically, sufficient prepared magnetorheological fluid is added to the magnetorheological fluid container 71, and the vibration module 72 and stirring blade 73 are activated to ensure the uniformity of the magnetorheological fluid. Then, the pump 74 is activated to supply the magnetorheological fluid to the magnetorheological fluid channel F. When the entire magnetorheological fluid channel F is filled and the surface to be polished of the bearing inner ring 100 is completely submerged, the power supply 6 and ultraviolet light source 52 are sequentially turned on. The magnetorheological fluid generates a strong oxidation potential under the irradiation of ultraviolet light, which accelerates the formation of the oxide layer on the surface to be polished of the bearing inner ring 100. Through electrolysis, the molten layer and the oxide layer on the surface to be polished of the bearing inner ring 100 are accelerated to dissolve, driving the supporting turntable 1 and the connecting turntable 8 to rotate in opposite directions. Under the action of the magnetic field, the magnetic abrasive particles in the magnetorheological fluid are adsorbed on the surface of the magnetic module 3 to form a flexible grinding head. Under the action of relative rotation, the molten layer and the oxide layer on the surface to be polished of the bearing inner ring 100 are mechanically removed. The above-mentioned ultraviolet light catalytic oxidation, electrolytic dissolution and mechanical removal are cyclically carried out until the material removal of the surface to be polished of the bearing inner ring 100 is completed, thereby realizing its ultra-precision polishing process.

[0050] After polishing is completed, the bearing inner ring 100 is cleaned and dried, and its polishing effect is tested.

[0051] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that the remaining undescribed portions are prior art, and that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims fall within the scope of protection of the present invention.

Claims

1. A polishing device based on magnetorheological fluid, characterized in that: The invention comprises a support turntable, a laser heating module, a magnetorheological fluid supply assembly, and a sleeve structure movably arranged above the support turntable. The support turntable and the sleeve structure together form a mounting cavity for placing a workpiece. The inner wall of the sleeve structure is used to form a magnetorheological fluid channel with the surface to be polished of the workpiece. The sleeve structure is provided with a magnetic module to form a magnetic field. The magnetorheological fluid supply assembly is used to supply magnetorheological fluid to the magnetorheological fluid channel so that the magnetorheological fluid polishes the surface to be polished of the workpiece under the action of the magnetic field. The laser heating module is arranged on one side of the preset mounting cavity and is used to heat the surface to be polished of the workpiece before the polishing process. The sleeve structure is further provided with an ultraviolet catalytic module, which is used to emit ultraviolet light to the magnetorheological fluid channel to catalyze the magnetorheological fluid, wherein the magnetorheological fluid contains magnetic abrasive particles, photosensitive material nano-titanium dioxide (TiO2), hydrogen peroxide (H2O2) and water; the ultraviolet catalytic module includes an ultraviolet light source and a protective cover, the protective cover and the magnetic module are spliced ​​in the circumferential direction of the sleeve structure to form the sleeve structure, the side wall of the protective cover facing the magnetorheological fluid channel is made of a transparent or translucent material, the ultraviolet light source is arranged on the protective cover and emits ultraviolet light to the magnetorheological fluid channel through the side wall of the protective cover; and / or; The magnetic module is a magnet made of conductive magnetic material, and is also provided with a power supply. The positive pole of the power supply is used to electrically connect the workpiece, and the negative pole of the power supply is electrically connected to the magnet. Thus, the magnet, the workpiece and the magnetorheological fluid form an electrolytic cell. The magnetorheological fluid contains magnetic abrasive particles and conductive ions. The conductive ions are Na + or K + .

2. The magnetorheological polishing device according to claim 1, characterized in that: The magnetorheological fluid supply assembly includes a magnetorheological fluid container, which is used to store the magnetorheological fluid. The magnetorheological fluid container is provided with a vibration module located on the outside and / or a stirring blade located on the inside.

3. The magnetorheological polishing device according to claim 2, characterized in that: The magnetorheological fluid container is provided with a vibration module located on its outside and a stirring blade located on its inside. The vibration module is a plurality of ultrasonic vibration modules respectively arranged at the bottom and side of the magnetorheological fluid container. The stirring blade has multiple stirring blades respectively arranged at the bottom and side of the magnetorheological fluid container, and the stirring blades and the ultrasonic vibration modules are arranged correspondingly.

4. The magnetorheological polishing device according to claim 2, characterized in that: The magnetorheological fluid container is arranged below the supporting turntable, and the supporting turntable is provided with a slurry return hole so that the magnetorheological fluid in the magnetorheological fluid channel can flow back to the magnetorheological fluid container; An annular protrusion is provided on the outer edge of the supporting turntable so that the supporting turntable forms a buffer tank for temporarily storing the magnetorheological fluid, and the slurry return hole is arranged in the buffer tank.

5. The magnetorheological polishing device according to claim 1, characterized in that: The rotation axis direction of the supporting turntable is defined as the Y-axis direction, and the laser heating module has relative movement with respect to the supporting turntable, namely translation along the Y-axis direction and rotation around the Y-axis direction. The sleeve structure is movably arranged above the supporting turntable in a manner of translation along the Y-axis direction and rotation around the Y-axis direction.

6. The magnetorheological polishing device according to claim 5, characterized in that: The workpiece is a bearing inner ring, a connecting piece is provided at the rotating shaft of the supporting turntable, and an end cover is also provided. The end cover is connected to the supporting turntable through the connecting piece, and the end cover is used to press on top of the bearing inner ring and press the bearing inner ring by being connected to the supporting turntable.

7. A polishing method based on magnetorheological fluid, characterized in that: The polishing method is based on the polishing device according to any one of claims 1 to 6, and the operating steps of the polishing method include: S1, placing a workpiece on a supporting turntable, and starting a laser heating device to perform laser heating on the surface to be polished of the workpiece to soften the surface to be polished; S2. The sleeve structure moves onto the supporting turntable and is sleeved outside the workpiece to form a magnetorheological fluid channel, and the magnetic module forms a magnetic field in the magnetorheological fluid channel; S3. The magnetorheological fluid supply assembly supplies magnetorheological fluid to the magnetorheological fluid channel, so that the magnetorheological fluid moves relative to the workpiece under a magnetic field environment to polish the surface to be polished of the workpiece.

8. The magnetorheological polishing method according to claim 7, characterized in that: The sleeve structure is fixedly connected to the connecting turntable, and the rotation axis direction of the supporting turntable is defined as the Y-axis direction. The connecting turntable moves relative to the supporting turntable in a manner of translation along the Y-axis direction and rotation around the Y-axis direction; In step S2, the connecting turntable translates along the Y-axis direction to drive the sleeve structure to translate and be sleeved outside the workpiece; The ultraviolet catalytic module is arranged on one side of the magnetorheological fluid channel, and the magnetorheological fluid is the electrolyte of the electrolytic cell; In step S3, the electrolytic cell generates an electrolytic reaction and / or the ultraviolet catalytic module emits ultraviolet light to the magnetorheological fluid channel, and the connecting turntable and the supporting turntable rotate synchronously in opposite directions around the Y-axis direction.

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