CN108527016B - Ultra-precise magnetic grinding device and method utilizing low-frequency alternating magnetic field - Google Patents
Ultra-precise magnetic grinding device and method utilizing low-frequency alternating magnetic field Download PDFInfo
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- CN108527016B CN108527016B CN201810618804.6A CN201810618804A CN108527016B CN 108527016 B CN108527016 B CN 108527016B CN 201810618804 A CN201810618804 A CN 201810618804A CN 108527016 B CN108527016 B CN 108527016B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/005—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using a magnetic polishing agent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The device comprises a frame, an X-axis feeding device, a Y-axis feeding device, a Z-axis feeding clamp rack and an alternating magnetic field polishing device, wherein the X-axis feeding device is arranged on the frame platform, the Y-axis feeding device is transversely arranged on the X-axis feeding device, the alternating magnetic field polishing device is arranged on the Y-axis feeding device, the alternating magnetic field polishing device comprises a motor, an iron core, a coil, a main shaft, a grinding liquid tray and a slotted magnetic pole, the main shaft is arranged in the iron core, the coil is wound outside the iron core, the motor is in transmission connection with the main shaft, the slotted magnetic pole is arranged at the upper end of the main shaft, and the grinding liquid tray is arranged at the upper end of the slotted magnetic pole. The invention introduces a low-frequency alternating magnetic field (1 Hz-7 Hz) to promote the grinding tool to generate periodical up-and-down fluctuation under the action of the low-frequency alternating magnetic force. The abrasive is promoted to fully enter the processed surface, deformation generated after the magnetic particle cluster is contacted with the workpiece is prevented, and the stability of the grinding tool is ensured.
Description
Technical Field
The invention relates to a grinding and polishing device and a method, in particular to a nanoscale ultra-precise magnetic grinding device and a method utilizing a low-frequency alternating magnetic field.
Background
With the rapid development of high and new industries such as optics, electronics, communication, aerospace, bioengineering and the like, components composed of various complex shapes and difficult-to-process materials have more strict requirements on ultra-precise processing technology. Magnetic grinding is an advanced processing technology which uses the transmission action of magnetic force lines to realize material removal by applying relative motion between a magnetic brush and a workpiece, but the technology is difficult to realize nano-scale processing of the surface of the workpiece. The reason for this is that a nano-sized machined surface is usually obtained using magnetic abrasive grains of several micrometers or non-magnetic abrasive grains of ultra-micrometer size, however, in the machining process, the aggregation of the magnetic grains and the non-magnetic abrasive grains are unevenly distributed, and deformation after the magnetic grinding brush contacts with the workpiece not only hinders the obtaining of a high quality surface, but also reduces the machining efficiency, and especially when machining grooves and corners, the abrasive cannot fully spread over the entire machined surface, affecting the surface machining uniformity. Moreover, the abrasion loss of the part of the magnetic brush head is serious, and the abrasion at the root part cannot be fully conveyed to the magnetic brush head, so that the utilization rate of the abrasion is low.
Disclosure of Invention
In order to solve the problems, the invention provides an ultra-precise magnetic grinding device and method by utilizing a low-frequency alternating magnetic field, which utilize the changing magnetic force generated under the low-frequency alternating magnetic field to promote the magnetic clusters to generate dispersion and shrinkage type cyclic change in a processing area, and the change not only promotes the dispersion of magnetic particles and grinding materials, but also solves the problem of deformation generated after the magnetic clusters are contacted with a workpiece, thereby fully realizing the circulation and updating of the grinding materials and ensuring the stability of a grinding tool.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides an utilize ultra-precise magnetic force grinding device of low frequency alternating magnetic field, includes frame, X axle feeding device, Y axle feeding device, Z axle feeding anchor clamps rack, alternating magnetic field burnishing device, X axle feeding device installs on the frame platform, and Y axle feeding device transversely sets up on X axle feeding device, and alternating magnetic field burnishing device installs on Y axle feeding device, Z axle feeding anchor clamps rack includes the guide rail of vertical setting, the anchor clamps slip table of upper and lower slip on the guide pillar, the anchor clamps slip table is arranged in the top of alternating magnetic field burnishing device; the alternating magnetic field polishing device comprises a motor, a coil barrel, a coil, a main shaft, a grinding fluid tray and a slotted magnetic pole, wherein the main shaft is arranged in the coil barrel, the coil is wound outside the coil barrel, the motor is in transmission connection with the main shaft, a threaded hole is formed in the slotted magnetic pole and is arranged at the upper end of the main shaft, and the grinding fluid tray is arranged at the upper end of the slotted magnetic pole.
The X-axis feeding device comprises a stepping motor, a linear slide rail, a sliding block and a screw rod, wherein the stepping motor drives the screw rod to rotate, the screw rod is in threaded connection with a screw rod nut, and the sliding block slides on the linear slide rail under the drive of the screw rod nut.
The X-axis feeding device comprises a stepping motor, a linear slide rail, a sliding block and a screw rod, wherein the stepping motor drives the screw rod to rotate, the screw rod is in threaded connection with a screw rod nut, and the sliding block slides on the linear slide rail under the drive of the screw rod nut.
A method for carrying out ultra-precise magnetic grinding by adopting a magnetic grinding device comprises the following steps:
1) Filling a grinding fluid tray with a magnetic abrasive particle slurry composed of grinding fluid, magnetic particles and abrasive particles;
2) Fixing a workpiece on a clamp sliding table, and adjusting the height of the clamp sliding table to enable the workpiece to be placed at the upper end of a grinding fluid tray;
3) A low-frequency alternating current is fed into the coil, the frequency of the low-frequency alternating magnetic field is 1Hz-7Hz, magnetic particle clusters which vibrate periodically are formed in the grinding liquid tray by the magnetic abrasive particle slurry, and the motor is started to grind and polish a workpiece by the magnetic particle clusters;
4) When the magnetic force is upward, the magnetic particle clusters are contracted under the action of the magnetic force, and the magnetic particles float above the abrasive particles to grind the workpiece; when the magnetic field force is downward, the magnetic particle clusters are divergent under the magnetic field force, and the magnetic particles are remixed with the abrasive particles; the continuous up-and-down fluctuation improves the self-stirring efficiency of the abrasive, improves the utilization rate of abrasive particles and prevents the aggregation of magnetic particle clusters.
The magnetic abrasive particle slurry comprises the following components in percentage by weight: magnetic particles: abrasive particles = 1-3: 12-18: 3 to 8.
The grinding fluid is oil-based grinding fluid oil-based silicon carbide grinding fluid.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention introduces a low-frequency alternating magnetic field (1 Hz-7 Hz) to promote the grinding tool (magnetic particle cluster) to generate periodic up-and-down fluctuation under the action of low-frequency alternating magnetic force. The fluctuation is utilized to not only improve the stirring effect of the abrasive, promote the abrasive to fully enter the processed surface, but also prevent the deformation generated after the magnetic particle cluster is contacted with the workpiece, and ensure the stability of the grinding tool.
2) The invention solves the problems of deformation of the magnetic grinding brush, low utilization rate of abrasive materials and the like in the traditional magnetic grinding process by introducing the variable magnetic force generated by the low-frequency alternating magnetic field, not only improves the processing efficiency, but also realizes the uniform and omnibearing nano-scale processing of the magnetic grinding.
3) The feeding in the X-axis, Y-axis and Z-axis directions can be manually operated, and the workpiece can be polished in all directions through programming. The clamp sliding table is provided with the expansion threaded holes around, so that special-shaped workpieces can be clamped, a specific clamp can be installed on the expansion holes during batch processing, clamping is convenient, and processing efficiency is improved.
4) In the conventional magnetic grinding processing by using an electromagnetic coil, the electromagnetic coil is stationary and applies a rotary motion to a workpiece to process the workpiece, and the method is not suitable for processing large-size workpieces. According to the invention, the grinding tool, the tray, the magnetic poles and the main shaft are connected into a whole, so that the self-rotation movement of the grinding tool can be realized, the grinding tool is not interfered with the outside, and the processing of a large-size workpiece can be effectively realized.
5) The magnetic pole is connected with the main shaft through the screw thread, the front end of the main shaft is processed into the external screw thread, the magnetic pole is internally provided with the screw hole, different types of magnetic heads can be selected according to the shape of a processed workpiece, the processing efficiency is improved, and the assembly and the disassembly are convenient.
6) The invention can carry out the deburring processing on the edges of the grooves of the workpiece with the micro groove surfaces by utilizing the magnetic grinding method of the low-frequency alternating magnetic field, and the surface roughness value of the workpiece after grinding can be reduced to below 10 nanometers.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of an X-axis feeding device.
Fig. 3 is a schematic view of a Y-axis feeder.
Fig. 4 is a schematic view of a Z-axis feeding device.
Fig. 5 is a schematic view of an alternating magnetic field polishing apparatus.
Fig. 6 is a cross-sectional view of the alternating magnetic field polishing apparatus.
Fig. 7 is a schematic view of a cluster of magnetic particles.
Fig. 8 is a magnetic particle cluster morphology diagram (one) under different magnetic field directions.
Fig. 9 is a magnetic particle cluster morphology (two) for different magnetic field directions.
Fig. 10 is a slotted pole end view.
Fig. 11 is a top view of fig. 10.
In the figure: 1-Z axis feeding fixture bench, 2-alternating magnetic field polishing device, 3-Y axis feeding device, 4-X axis feeding device, 5-frame, 6-control cabinet, 7-operation panel, 8-stepping motor, 9-coupler, 10-lead screw, 11-lead screw nut, 12-lead screw nut seat, 13-X axis sliding platform, 14-linear slide rail, 15-slide block, 16-X axis sliding platform base, 17-Z axis feeding device, 18-fixture bench, 19-fixture sliding platform, 20-motor, 21-coil cylinder, 22-grinding liquid tray, 23-coil, 24-base, 25-slotted magnetic pole, 26-bearing, 27-main shaft, 28-main shaft housing, 29-synchronous pulley, 30-synchronous belt, 31-grinding liquid, 32-magnetic particle, 33-abrasive particle, 34-magnetic force line, 35-magnetic equipotential line, 36-alternating magnetic field, 37-work piece, 38-Y axis sliding platform, 39-Y axis sliding platform base, 40-slotted hole.
Detailed Description
The present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to the examples.
As shown in fig. 1-6, the ultra-precise magnetic grinding device utilizing the low-frequency alternating magnetic field comprises a frame 5, an X-axis feeding device 4, a Y-axis feeding device 3, a Z-axis feeding clamp rack 1 and an alternating magnetic field polishing device 2, wherein the X-axis feeding device 4 is arranged on a platform of the frame 5, the Y-axis feeding device 3 is transversely arranged on the X-axis feeding device 4, the alternating magnetic field polishing device 2 is arranged on the Y-axis feeding device 3, the Z-axis feeding clamp rack 1 comprises a guide rail which is longitudinally arranged and a clamp sliding table 19 which slides up and down on the guide rail, and the clamp sliding table 19 is arranged above the alternating magnetic field polishing device 2; the alternating magnetic field polishing device 2 comprises a motor 20, a coil barrel 21, a coil 23, a main shaft 27, a grinding fluid tray 22 and a slotted magnetic pole 25, wherein the main shaft 27 is arranged inside the coil barrel 21, a gap of 1mm is reserved between the coil barrel and a workpiece, the coil 23 is wound outside the coil barrel 21, the motor 20 is in transmission connection with the main shaft 27, the slotted magnetic pole 25 is arranged at the upper end of the main shaft 27, and the grinding fluid tray 22 is arranged at the upper end of the slotted magnetic pole 25.
Referring to fig. 10 and 11, the upper end surface of the slotted pole 25 is provided with a plurality of slots 40, and the plurality of transverse slots 40 perpendicularly intersect with the plurality of longitudinal slots 40 to adjust the magnetic induction intensity in the machining area. The slotted pole 25 is screwed with the spindle 27, and the poles with different shapes can be replaced according to the processing requirement. The end face of the magnetic pole shape is a plane generally, the magnetic field intensity distribution of the plane magnetic pole is high in the periphery, low in the middle, and uneven in the magnetic field intensity distribution, the uniformity of the magnetic field intensity distribution in a processing area can be improved by utilizing the slotted magnetic pole, stable vibration of the magnetic particle cluster is promoted, and therefore the uniformity of a processing surface is guaranteed.
As shown in fig. 2, the X-axis feeding device 4 includes a stepper motor 8, a linear slide rail 14, a slider 15, and a screw 10, where the stepper motor 8 drives the screw 10 to rotate, the screw 10 is screwed with a screw nut 11, and the slider 15 slides on the linear slide rail 14 under the drive of the screw nut 11.
The stepping motor 8 is connected with the screw rod 10 through a coupler 9, and is arranged on an X-axis sliding table base 16, and the X-axis sliding table base 16 is arranged on a platform of the frame 5. The linear slide rail 14 is arranged on the edge boss of the X-axis slide table base 16. The screw nut 11 is mounted on the lower part of the X-axis sliding platform 13 through a screw nut seat 12, and the sliding block 15 is mounted on the lower edge of the X-axis sliding platform 13. The screw nut 11 is matched with the screw 10, and two sliding blocks 15 on two sides of the bottom of the X-axis sliding platform 13 are matched with a linear sliding rail 14. The screw rod 10 is driven to rotate by controlling the stepping motor 8 to rotate clockwise or anticlockwise, and the screw rod nut 11 drives the X-axis sliding platform 13 to slide along the X-axis direction.
As shown in fig. 3, the Y-axis feeding device 3 includes a stepper motor 8, a linear slide rail 14, a slider 15, and a screw 10, where the stepper motor 8 drives the screw 10 to rotate, the screw 10 is screwed with a screw nut 11, and the slider 15 slides on the linear slide rail 15 under the drive of the screw nut 11.
The stepping motor 8 is connected with the screw rod 10 through a coupler 9 and is arranged on a Y-axis sliding table base 39, a linear slide rail 14 is arranged on the edge boss of the Y-axis sliding table base 39, and the Y-axis sliding table base 39 is fastened on the X-axis sliding platform 13 through bolts. The screw nut 11 is installed at the bottom of the Y-axis sliding platform 38 through the screw nut seat 12, and the sliding block 15 is installed at the bottom edge of the Y-axis sliding platform 38. The screw nut 11 is matched with the screw 10, and two sliding blocks 15 on two sides of the bottom of the Y-axis sliding platform 38 are matched with a linear sliding rail 14. The screw rod 10 is driven to rotate by controlling the stepping motor 8 to rotate clockwise or anticlockwise, and the screw rod nut 11 drives the Y-axis sliding platform 38 to slide along the Y-axis.
The Y-axis feeding device 3 is mounted on an X-axis slide table 13. The Y-axis sliding platform 38 is used for carrying the alternating magnetic field polishing device 2, so that the alternating magnetic field polishing device 2 can realize horizontal movement in the X-axis direction and the Y-axis direction.
See fig. 4,Z the axle feeds anchor clamps rack 1 and includes anchor clamps rack 18, Z axle feeding device 17, anchor clamps slip table 19, and anchor clamps rack 18 is fixed on frame 5 platform by four optical axis guide rails, and the four corners of anchor clamps slip table 19 are equipped with linear bearing and four optical axis guide rail cooperation realization and are in the slip of Z axle direction. The power source for the Z-axis sliding of the clamp sliding table 19 is provided by the Z-axis feeding devices 17 arranged on two sides of the clamp bench 18. The Z-axis feeding device 17 is a motor-driven screw rod which is arranged on two sides of the clamp bench 18 and is fixed, screw rod nuts are arranged on two sides of the clamp slipway 19 and are matched with the screw rod of the Z-axis feeding device 17, so that the movement of the clamp slipway 19 in the Z-axis direction is realized, and M10 threaded holes are formed in the periphery of the clamp slipway 19 and are used for clamping the workpiece 37 and expanding the use of the special-shaped workpiece clamp.
Below the frame 5 is a control cabinet 6, an operation panel 7 is arranged on the left side of the platform of the frame 5, and an X-axis feeding device 4 and a clamp rack 18 are arranged on the right side of the platform of the frame 5. An electric control system is arranged in the control cabinet 6.
Referring to fig. 5 and 6, the alternating magnetic field polishing apparatus 2 includes a motor 20, a timing pulley 29, a timing belt 30, a spindle 27, a spindle housing 28, a bearing 26, a base 24, a slotted magnetic pole 25, a slurry tray 22, a coil 23, and a coil bobbin 21; the motor 20 and the main shaft housing 28 are arranged on the base 24, the main shaft 27 is arranged inside the main shaft housing 28, the bearings 26 are arranged at the shaft shoulder positions at two ends of the main shaft 27, and the power of the motor 20 is transmitted to the main shaft 27 through the synchronous pulley 29 and the synchronous belt 30. The output end of the main shaft 27 is in threaded connection with the slotted magnetic pole 25, and the grinding fluid tray 22 and the slotted magnetic pole 25 are fastened by machine screws. The coil 23 is wound around the coil bobbin 21, and the coil 23 and the coil bobbin 21 are mounted on the base 24 concentrically with the spindle 27, and the coil 23 is supplied with an alternating current to generate a varying magnetic field. The base 24 of the alternating magnetic field polishing apparatus 2 is mounted on a Y-axis sliding table 38 for movement in the planar X-direction and Y-direction.
A method for carrying out ultra-precise magnetic grinding by adopting a magnetic grinding device comprises the following steps:
1) Referring to fig. 7, a slurry of magnetic abrasive particles composed of an abrasive liquid 31, magnetic particles 32, and abrasive grains 33 is loaded into an abrasive liquid tray 22;
2) Fixing the workpiece 37 on the clamp sliding table 19, and adjusting the height of the clamp sliding table 19 to enable the workpiece 37 to be placed at the upper end of the grinding fluid tray 22;
3) The coil 23 is fed with low-frequency alternating current, the frequency of the low-frequency alternating magnetic field is 1Hz-7Hz, the magnetic abrasive particle slurry forms periodically vibrating magnetic particle clusters in the grinding fluid tray 22, and the motor 20 is started to grind and polish the workpiece 37 by utilizing the magnetic particle clusters;
4) Referring to fig. 8, when the magnetic force is upward, the magnetic particle clusters shrink under the magnetic force, and the magnetic particles 32 float the abrasive particles 33 above to grind the workpiece 37; referring to fig. 9, when the magnetic field force is downward, the clusters of magnetic particles are diverged by the magnetic field force, and the magnetic particles 32 are remixed with the abrasive particles 33; the continuous up-and-down fluctuation improves the self-stirring efficiency of the abrasive, improves the utilization rate of abrasive particles and prevents the aggregation of magnetic particle clusters.
The method comprises the steps of grinding the surface of a workpiece with micro grooves by utilizing the characteristic that magnetic particle clusters periodically vibrate under a low-frequency alternating magnetic field, so that grinding materials are promoted to fully enter the surface of a processed groove, deformation generated after the magnetic particle clusters are contacted with the workpiece is prevented, the processing efficiency is improved, and the stability of a grinding tool is ensured; can effectively realize the surface processing of the micro-groove, and the surface roughness value of the workpiece after grinding can be reduced to below 10 nanometers. The workpiece 37 polished by the invention comprises the following materials: SUS304 stainless steel, C2680 brass, racing steel plate, and optical glass.
The magnetic abrasive particle slurry comprises the following components in percentage by weight: magnetic particles: abrasive particles = 1-3: 12-18: 3 to 8.
The polishing liquid was an oil-based polishing liquid (a Jiasheng oil-based cutting liquid, model 988).
The invention uses magnetic particle clusters to replace the traditional magnetic brush, the magnetic particle clusters are softer than the magnetic brush, the surface scratch of the workpiece is not easy to be caused in the processing process, the magnetic particle clusters are formed by magnetic abrasive particle slurry (grinding liquid 31, magnetic particles 32 and abrasive particles 33), the magnetic particle clusters are formed under the action of a magnetic field, and the magnetic particle clusters are in a liquid state under the action of no magnetic field.
The present invention selects an oil-based slurry as the slurry 31 of the magnetic abrasive slurry. When the electromagnetic coil 23 is supplied with low-frequency alternating current, the magnetic particles 32 vibrate most actively under the oil-based grinding fluid, and the utilization rate of the abrasive particles 33 is highest.
Claims (5)
1. The ultra-precise magnetic grinding device utilizing the low-frequency alternating magnetic field is characterized by comprising a frame, an X-axis feeding device, a Y-axis feeding device, a Z-axis feeding clamp rack and an alternating magnetic field polishing device, wherein the X-axis feeding device is arranged on a frame platform, the Y-axis feeding device is transversely arranged on the X-axis feeding device, the alternating magnetic field polishing device is arranged on the Y-axis feeding device, the Z-axis feeding clamp rack comprises a guide rail which is longitudinally arranged and a clamp sliding table which slides up and down on the guide pillar, and the clamp sliding table is arranged above the alternating magnetic field polishing device;
the alternating magnetic field polishing device comprises a motor, a synchronous pulley, a synchronous belt, a main shaft shell, a bearing, a base, slotted magnetic poles, a grinding fluid tray, a coil and a coil barrel; the main shaft is arranged in the coil cylinder, the coil is wound outside the coil cylinder, the motor is in transmission connection with the main shaft, the slotted magnetic pole is arranged at the upper end of the main shaft, and the grinding fluid tray is arranged at the upper end of the slotted magnetic pole;
the motor and the main shaft shell are arranged on the base, the main shaft is arranged in the main shaft shell, bearings are arranged at shaft shoulders at two ends of the main shaft, motor power is transmitted to the main shaft through a synchronous pulley and a synchronous belt, the output end of the main shaft is in threaded connection with a slotted magnetic pole, and the grinding fluid tray and the slotted magnetic pole are fastened through a machine meter screw; the coil and the coil cylinder are arranged on the base and concentric with the main shaft, and the coil is electrified with alternating current to generate a variable magnetic field; the base of the alternating magnetic field polishing device is arranged on the Y-axis sliding platform and can move in the X direction and the Y direction of the plane;
the upper end face of the slotted magnetic pole is provided with a plurality of slotted holes, the plurality of transverse slotted holes are vertically intersected with the plurality of longitudinal slotted holes, and the slotted magnetic pole is connected with the spindle through threads;
the method for carrying out ultra-precise magnetic grinding by adopting a magnetic grinding device comprises the following specific steps:
1) Filling a grinding fluid tray with a magnetic abrasive particle slurry composed of grinding fluid, magnetic particles and abrasive particles;
2) Fixing a workpiece on a clamp sliding table, and adjusting the height of the clamp sliding table to enable the workpiece to be placed at the upper end of a grinding fluid tray;
3) A low-frequency alternating current is fed into the coil, the frequency of the low-frequency alternating magnetic field is 1Hz-7Hz, magnetic particle clusters which vibrate periodically are formed in the grinding liquid tray by the magnetic abrasive particle slurry, and the motor is started to grind and polish a workpiece by the magnetic particle clusters;
4) When the magnetic force is upward, the magnetic particle clusters are contracted under the action of the magnetic force, and the magnetic particles float above the abrasive particles to grind the workpiece; when the magnetic field force is downward, the magnetic particle clusters are divergent under the magnetic field force, and the magnetic particles are remixed with the abrasive particles; the continuous up-and-down fluctuation improves the self-stirring efficiency of the abrasive, improves the utilization rate of abrasive particles and prevents the aggregation of magnetic particle clusters.
2. The ultra-precise magnetic grinding device utilizing the low-frequency alternating magnetic field according to claim 1, wherein the X-axis feeding device comprises a stepping motor, a linear slide rail, a sliding block and a screw rod, the stepping motor drives the screw rod to rotate, the screw rod is screwed with a screw rod nut, and the sliding block slides on the linear slide rail under the driving of the screw rod nut.
3. The ultra-precise magnetic grinding device utilizing the low-frequency alternating magnetic field according to claim 1, wherein the Y-axis feeding device comprises a stepping motor, a linear slide rail, a sliding block and a screw rod, the stepping motor drives the screw rod to rotate, the screw rod is screwed with a screw rod nut, and the sliding block slides on the linear slide rail under the driving of the screw rod nut.
4. The ultra-precise magnetic grinding device utilizing the low-frequency alternating magnetic field according to claim 1, wherein the ratio of the magnetic abrasive particle slurry is: magnetic particles: abrasive particles = 1-3: 12-18: 3 to 8.
5. The ultra-precise magnetic polishing apparatus according to claim 4, wherein the polishing liquid is an oil-based polishing liquid.
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