Polishing device and polishing method based on magneto-rheology

Abstract

The invention relates to the technical field of machining, in particular to a polishing device based on magnetorheological and a polishing method based on the polishing device.The polishing device comprises a supporting rotary disc, a laser heating module, a magnetorheological fluid supply assembly and a sleeve structure movably arranged above the supporting rotary disc. A mounting cavity used for containing a workpiece is defined by the supporting rotary disc and the sleeve structure, the inner wall of the sleeve structure is used for forming a magnetorheological fluid channel with the to-be-polished surface of the workpiece, and the sleeve structure is provided with a magnetic module to form a magnetic field. The magnetorheological fluid supply assembly is used for supplying magnetorheological fluid to the magnetorheological fluid channel so that the magnetorheological fluid can polish the to-be-polished surface of the workpiece under the action of a magnetic field, and the laser heating module is arranged on one side of the preset mounting cavity and used for heating the to-be-polished surface of the workpiece before polishing. The to-be-polished surface of the workpiece is heated and softened before magneto-rheological machining, so that materials on the surface of the workpiece are easier to remove, and the polishing efficiency is improved.

Description

Technical Field

[0001] The 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 in mechanical equipment, and their surface quality directly affects the performance of the equipment. The main polishing surfaces of the outer surface of the inner ring of the bearing include the cylindrical surface, the groove and the rib. At present, they are mainly polished in sequence by grinding, and the overall processing efficiency is low. The groove is its main working surface, and it is usually necessary to use oilstone for ultra-precision grinding. However, with the development of the bearing industry, more and more curved surfaces are used for groove profiles, such as spiral logarithmic curves, and it is very difficult to grind ultra-precision for such complex profile surfaces; the rib is narrow in width, and ordinary mechanical processing is prone to interference, and grinding and other machining processes are prone to mechanical damage such as knife 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 outer surface structures. As a flexible processing method, magnetorheological processing has a small processing force and can remove surface materials without causing surface and sub-surface damage. Its working principle is that the magnetorheological fluid instantly forms a flexible polishing head with a certain strength of magnetic cluster under the action of the magnetic field, and performs ultra-precision processing on the outer surface of the workpiece. Since the magnetorheological fluid is a liquid, it has good adaptability to the processing surface structure and can polish the inner ring of the bearing or other parts with complex outer surface structures. The magnetorheological fluid can cool the processed surface while removing the surface material, but the removal efficiency of magnetorheological polishing is low due to its small processing force. Summary of the invention

[0004] The purpose of the present invention is to provide a polishing device and a 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 inner ring of the bearing and the magnetorheological polishing efficiency is low.

[0005] To achieve the above object, the technical solution of the present invention includes:

[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, and the laser heating module is arranged on one side of the preset installation cavity for heating 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, and the ultraviolet catalytic module is used to emit ultraviolet light to the magnetorheological fluid channel to catalyze the magnetorheological fluid, and 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 magnetizer made of conductive and magnetic materials, 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 magnetizer, so that the magnetizer, 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 comprises a magnetorheological fluid container, the magnetorheological fluid container is used to store the magnetorheological fluid, and 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 the outside thereof and a stirring blade located on the inside thereof, the vibration module is a plurality of ultrasonic vibration modules respectively arranged at the bottom and the side of the magnetorheological fluid container, the stirring blade has a plurality of stirring blades respectively arranged at the bottom and the side of the magnetorheological fluid container, and the stirring blade and the ultrasonic vibration module are arranged correspondingly.

[0012] In one embodiment, 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; the outer edge of the supporting turntable is provided with an annular protrusion so that the supporting turntable forms a cache groove for temporarily storing the magnetorheological fluid, and the slurry return hole is arranged in the cache groove.

[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 with respect 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 also includes an end cover, the end cover is connected to the supporting turntable through the connecting piece, and the end cover is used to press on the 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 magnetorheology, 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 to soften the surface to be polished;

[0018] S2, the sleeve structure moves to 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 component 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 translating along the Y-axis direction and rotating 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 disposed 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, that is, it can adapt to the polishing of the complex groove surface, and can precisely polish the rib 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 abrasive particles, conductive ions, photosensitive ions and oxidants, which can effectively conduct the coupling effects between composite energy fields such as magnetic, electrolytic, chemical and mechanical fields, and significantly improve 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] Wherein: F magnetorheological fluid channel, 1 support turntable, 11 slurry return hole, 12 annular convex part, 2 laser heating module, 3 magnetic module, 41 connecting piece, 42 end cover, 5 ultraviolet catalytic 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 retaining edge. DETAILED DESCRIPTION

[0028] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] See also 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 the magnetorheological processing, the surface to be polished of the workpiece is heated and softened, so that the material on the surface of the workpiece 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 shaft or ring parts 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 the 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 inner ring of the bearing. Compared with the traditional method of grinding the cylindrical surface 100a, the groove 100b, and the rib 100c of the inner ring 100 of the bearing separately, it has the characteristics of good flexibility, can adapt to the polishing of the complex groove surface, 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 inner ring 100 of the bearing at the same time, thereby improving the polishing efficiency.

[0033] The rotation axis direction of the support turntable 1 is defined as the Y axis direction, and the laser heating module 2 has a relative movement of translation along the Y axis direction and rotation around the Y axis direction relative to the support turntable 1. In this embodiment, the laser heating module 2 is fixed, and the support turntable driving mechanism (the support turntable driving mechanism is not shown in the figure) connected to the support turntable 1 enables the support turntable 1 to have the function of rotating around the Y axis direction. The laser heating module 2 is connected to a laser driving mechanism (the laser driving mechanism is not shown in the figure). The laser heating module 2 can translate along the Y axis direction under the driving action of the laser driving mechanism, so that the laser heating module 2 can fully irradiate and heat the surface to be polished of the bearing inner ring 100 by relying on the rotation of the support turntable 1 and the lifting of the laser heating module 2. The sleeve structure is movably arranged above the support turntable 1 in a manner of translation along the Y axis direction, so that the sleeve structure can expose the outer surface of the bearing inner ring 100 at a position higher than the support turntable 1, so that the laser heating module 2 can emit laser on the outside of the bearing inner ring 100 to heat the surface to be polished of the bearing inner ring 100. 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] In order to fix the inner ring 100 of the bearing on the supporting turntable 1, a connecting member 41 is provided at the rotating shaft of the supporting turntable 1, and also includes an end cover 42. The end cover 42 is connected to the supporting turntable 1 through the connecting member 41. The end cover 42 is used to press on the upper part of the inner ring 100 of the bearing and press the inner ring 100 of the bearing by connecting to the supporting turntable 1. The connecting member 41 of this embodiment is a bolt and nut assembly. The head of the bolt is fixedly connected to the supporting turntable 1 by welding or the like. The threaded section of the bolt passes through the central through hole of the end cover 42. The end cover 42 is pressed on the inner ring 100 of the bearing, and a nut is screwed to the bolt at its central axis, so that the inner ring 100 of the bearing is pressed on the supporting turntable 1. In addition, in order to prevent the bolt and nut from protruding too much from the end cover and affecting the subsequent movement of the sleeve structure, a groove is provided in the middle of the end cover 42, and the groove is inserted into the inner ring 100 of the bearing.

[0035] The sleeve structure is formed by splicing a semi-circular magnetic module 3 and a semi-circular protective cover 51 in the circumferential direction of the sleeve structure. The protective cover 51 is provided with an ultraviolet light source 52. The side wall of the protective cover 51 facing the magnetorheological fluid channel F is made of a transparent material or a translucent material, so that the ultraviolet light source 52 can pass through the side wall and irradiate the magnetorheological fluid in the magnetorheological fluid channel F. The protective cover 51 can be made entirely of a transparent material or a translucent material, or only the side wall facing the magnetorheological fluid channel F is made of a transparent material or a translucent material, and the other side walls are made of an opaque material.

[0036] The protective cover 51 and the ultraviolet light source 52 form an ultraviolet catalytic module 5, which 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. The magnetorheological fluid does not contain strong corrosive agents and is green and friendly to the environment and the human body. The TiO2 contained therein easily absorbs ultraviolet light and produces strongly oxidizing hole-electron pairs. The holes react with H2O2 and water to form hydroxyl radicals (·OH) with strong oxidation 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 to mechanically remove the material on the workpiece surface to achieve the purpose of polishing. The oxide layer on the workpiece surface is easier to remove and fall off under the action of mechanical friction. Compared with the unoxidized bearing inner ring, after the surface is oxidized, it is beneficial for the flexible grinding head to more quickly remove the material on the surface to be polished of the bearing inner ring 100, that is, the efficiency of magnetorheological processing is improved.

[0037] The magnetic module 3 is a magnet made of conductive and magnetic materials, more specifically, a permanent magnet made of conductive and magnetic materials, wherein 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 magnetic materials 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 permanent magnets, and can also be made of soft magnetic materials, and the magnetic module 3 made of soft magnetic materials is magnetized by an energized coil to form a magnetic field.

[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 inner ring 100 of the bearing, so that the magnetic module 3, the inner ring 100 of the bearing and the magnetorheological fluid form an electrolytic cell. + Ion or K + The presence of conductive ions such as ions makes the slurry conductive. Under the action of the power supply 6, the magnetic module 3, the inner ring 100 of the bearing and the slurry form an electrolytic cell, and the magnetic module 3 acts as a cathode and the inner ring 100 of the bearing acts as an anode, which is conducive to the dissolution of the surface material of the inner ring 100 of the bearing, and 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 and reduces pollution. Furthermore, the electrons generated in the photocatalysis gather at the cathode, which will stay away from the holes, prevent the recombination of the two, and ensure the concentration of the holes, thereby promoting the formation of the oxide layer and improving the 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 the outside thereof and a stirring blade 73 located on the inside thereof. The vibration module 72 is a plurality of ultrasonic vibration modules respectively arranged at the bottom and the side of the magnetorheological fluid container 71, and the stirring blade 73 has a plurality of stirring blades respectively arranged at the bottom and the side of the magnetorheological fluid container 71, and the stirring blade 73 and the ultrasonic vibration module are arranged correspondingly. The ultrasonic vibration of the vibration module 72 can form mechanical vibration to the magnetorheological fluid container 71, so that the magnetorheological fluid in the magnetorheological fluid container 71 is vibrated to improve its uniformity. The stirring blade 73 can stir the magnetorheological fluid in the magnetorheological fluid container 71, and further improve 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 cooperation of the two further improves the uniformity of the magnetorheological fluid.

[0041] The magnetorheological fluid supply assembly also includes a pump 74, which is used to supply the magnetorheological fluid in the magnetorheological fluid container 71 to the magnetorheological fluid channel F. The magnetic module 3 and the protective cover 51 forming a sleeve structure are connected to the connecting turntable 8 by bolts. The connecting turntable 8 is provided with a slurry inlet hole 81. Under the pumping action of the pump 74, the magnetorheological fluid enters the magnetorheological fluid channel F through the slurry inlet hole 81. The magnetorheological fluid container 71 is arranged below the supporting turntable 1, and the supporting turntable 1 is provided with a slurry return hole 11 so that the magnetorheological fluid in the magnetorheological fluid channel F can flow back to the magnetorheological fluid container 71. Therefore, the magnetorheological fluid flows in a direction from top to bottom, and the flow is smoother, and the magnetorheological fluid can flow directly back to the magnetorheological fluid container 71 through the slurry return hole 11, and there is no need to set up more pipes and 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 buffer groove for temporarily storing magnetorheological fluid to prevent the magnetorheological fluid from overflowing. A slurry return hole 11 is arranged in the buffer groove so that the magnetorheological fluid in the buffer groove can flow back to the magnetorheological fluid container 71.

[0042] The connecting turntable 8 is connected to a connecting turntable driving mechanism (the connecting turntable driving mechanism is not shown in the figure), and the connecting turntable driving mechanism enables the connecting turntable 8 to translate along the Y-axis direction and rotate around the Y-axis direction, so that the connecting turntable 8 can move up and down relative to the supporting turntable 1, and can also rotate synchronously with the supporting turntable 1, driving the sleeve structure to translate along the Y-axis and rotate around the Y-axis. Among them, the supporting turntable driving mechanism, the laser driving mechanism and the connecting turntable driving mechanism are prior arts, and their specific structures are determined by those skilled in the art according to actual conditions, and will not be repeated here.

[0043] The magnetorheological fluid container 71 is a barrel-shaped container with an open top, and a filter screen 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 thereto. In other embodiments, the magnetic module 3 and the protective cover 51 are spliced ​​in the annular direction of the sleeve structure but are not semi-annular with a central angle of 180°. For example, the sleeve structure can be a separate sleeve-like part, 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, and 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 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 by 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 casting 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, and the magnetic module 3 forms a magnetic field in the magnetorheological fluid channel F. At this time, the bottom ends 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 component supplies magnetorheological fluid to the magnetorheological fluid channel F, so that the magnetorheological fluid moves relative to the workpiece in the magnetic field environment to polish the surface to be polished of the inner ring 100 of the bearing. At the same time, the electrolytic cell undergoes an electrolytic reaction, and the ultraviolet catalytic module 5 emits ultraviolet light to 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 the stirring blade 73 are started to ensure the uniformity of the magnetorheological fluid, and then the pump 74 is started to input the magnetorheological fluid into the magnetorheological fluid channel F. When the entire magnetorheological fluid channel F is filled and the surface to be polished of the inner ring 100 of the bearing is completely immersed, the power supply 6 and the ultraviolet light source 52 are turned on in sequence. The magnetorheological fluid generates a strong oxidation potential under the irradiation of ultraviolet light, which accelerates the formation of an oxide layer on the surface to be polished of the inner ring 100 of the bearing. After electrolysis, the molten layer and the oxide layer on the surface to be polished of the inner ring 100 of the bearing are dissolved rapidly, driving the supporting turntable 1 and the connecting turntable 8 to rotate in the opposite direction. 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 inner ring 100 of the bearing are mechanically removed. The above-mentioned ultraviolet light catalytic oxidation, electrolytic dissolution and mechanical removal are cyclically performed until the material removal of the surface to be polished of the inner ring 100 of the bearing 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, those skilled in the art should understand that the remaining undescribed portions are prior art, and that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims shall 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 supporting turntable, a laser heating module, a magnetorheological fluid supply assembly and a sleeve structure movably arranged above the supporting turntable, wherein 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 can perform polishing processing on the surface to be polished of the workpiece under the action of the magnetic field, and the laser heating module is arranged on one side of the preset installation cavity for heating the surface to be polished of the workpiece before the polishing processing.

2. A polishing device based on magnetorheological fluid according to claim 1, characterized in that: 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; The magnetic module is a magnetizer made of conductive and magnetic materials, 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 magnetizer, so that the magnetizer, the workpiece and the magnetorheological fluid form an electrolytic cell, and the magnetorheological fluid contains magnetic abrasive particles and conductive ions.

3. A polishing device based on magnetorheological fluid according to claim 2, characterized in that: The ultraviolet catalytic 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 ion is Na + or K + .

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

5. A polishing device based on magnetorheological fluid according to claim 4, characterized in that: The magnetorheological fluid container is provided with a vibration module located on the outside thereof and a stirring blade located on the inside thereof. The vibration module is a plurality of ultrasonic vibration modules respectively arranged at the bottom and the side of the magnetorheological fluid container. The stirring blade has a plurality of stirring blades respectively arranged at the bottom and the side of the magnetorheological fluid container, and the stirring blade and the ultrasonic vibration module are arranged correspondingly.

6. The magnetorheological polishing device according to claim 4, 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 groove for temporarily storing the magnetorheological fluid, and the slurry return hole is arranged in the buffer groove.

7. 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, 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.

8. The magnetorheological polishing device according to claim 7, characterized in that: The workpiece is a bearing inner ring, a connecting piece is provided at the rotating shaft of the supporting turntable, and also includes an end cover, the end cover is connected to the supporting turntable through the connecting piece, and the end cover is used to press on the top of the bearing inner ring and press the bearing inner ring by being connected to the supporting turntable.

9. 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 8, 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 to soften the surface to be polished; S2, the sleeve structure moves to 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 component 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.

10. A polishing method based on magnetorheological fluid according to claim 9, 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; It also includes an electrolytic cell and / or an ultraviolet catalytic module disposed 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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