CN110370093B - Magnetic composite abrasive flow polishing method with angle adjustable mechanism - Google Patents
Magnetic composite abrasive flow polishing method with angle adjustable mechanism Download PDFInfo
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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
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- 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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Abstract
A magnetic composite abrasive flow polishing method with an angle adjustable mechanism is disclosed, wherein abrasive flow processing is carried out in low-pressure fluid; the angle adjustable mechanism is arranged in the processing device with the magnetic field assistance; the magnetic field assistance is a uniform magnetic field with adjustable strength and vertical to the surface of the workpiece, which is generated by an electromagnet arranged right below the processing device, and under the action of the magnetic field, the magnetic composite abrasive particles in the flow field move to the surface of the workpiece under the action of the magnetic field force; the magnetic composite abrasive particles are composed of magnetic particles and silicon carbide abrasive particles; the magnetic particles are polystyrene microspheres wrapped with nanometer iron powder, and the silicon carbide abrasive particles are adsorbed on the surfaces of the magnetic particles through electrostatic action to form the magnetic composite abrasive particles. The invention ensures that the surface roughness of the polished workpiece is uniform and the processing efficiency is improved.
Description
Technical Field
The invention belongs to the field of ultra-precision machining, and relates to a magnetic composite abrasive particle flow polishing method with an angle adjustable mechanism.
Background
The low-pressure abrasive flow processing is a novel processing technology, fluid is used as a carrier of abrasive particles, and the surface of a workpiece is polished through the flow of the abrasive particles relative to the surface of the workpiece. In a conventional polishing process, such as grinding, the surface of a workpiece is polished by free abrasive particles on a grinding disc, but the distribution of the free abrasive particles on the grinding disc has great unevenness, so that the surface roughness of the workpiece at various positions after grinding is easily unequal, the surface is easily damaged, and the performance of the workpiece is seriously affected. The improvement of the grinding method of the dispersive abrasive particles is that the abrasive particles are relatively fixed on a grinding disc, the method can keep the distribution of the abrasive particles uniform, but because the distances between the abrasive particles and the rotation center are different in the grinding process, the linear speeds of the abrasive particles at different positions are not equal, the abrasion degree of the abrasive particles close to the edge of the grinding disc is far greater than that of the abrasive particles close to the rotation center, the polishing degree of the surface of a workpiece is different, and the quality of the processed surface is reduced. Although the prior advanced magnetic grinding technology can effectively alleviate the problems in the common grinding and polishing, the magnetic abrasive particles are dispersed due to centrifugal action when rotating at high speed along with a magnetic field in the processing process, so that the abrasive particles at the edge are separated from the magnetic field to restrict and scatter outwards, and the polishing force in a processing area is unevenly distributed. Compared with the polishing process, the low-pressure abrasive flow processing can obtain better processing effect, and is embodied in the aspects of lower surface roughness, more uniform surface quality, lower surface damage rate and the like. In addition, the low-pressure abrasive flow processing has the advantages that the low-pressure abrasive flow processing is also embodied in the aspect of polishing workpieces with various planes, grooves and complex geometric shapes, the traditional polishing process is difficult to completely process the workpieces with the shapes due to the limitation of a polishing tool, but abrasive particles can flow through all parts of the workpieces along with fluid in the low-pressure abrasive flow processing process, so that processing dead corners are almost avoided, and one-time processing in place is realized.
Despite the many incomparable advantages of low pressure abrasive stream processing, there are still some problems in low pressure abrasive stream processing, which are embodied in two aspects: (1) in the machining process, energy loss is caused by friction between fluid and the surface of a workpiece and collision between abrasive particles and the surface of the workpiece, pressure of the fluid in a machining area is reduced in the flowing direction, the polishing force on the surface of the workpiece is unevenly distributed, and finally the roughness value of the surface of the workpiece after polishing is unevenly distributed, so that the surface quality is reduced. (2) The efficiency is low in the processing process, and long time is needed for achieving the ideal processing effect. The material erosion rate of the low-pressure abrasive flow is low, and the shearing force of the abrasive particles to the wave crests on the surface of the workpiece is small due to insufficient pressure of the abrasive particles to the surface of the workpiece. The abrasive particles are distributed in the cross section perpendicular to the flowing direction of the fluid at a high random, only a small part of the abrasive particles distributed near the surface of the workpiece can play a polishing role, most of the abrasive particles only flow through the processing cavity along with the fluid and do not participate in polishing, and the utilization rate of the abrasive particles is low.
Disclosure of Invention
In order to solve the problems of uneven surface roughness and low processing efficiency of a workpiece after polishing in the low-pressure abrasive flow processing, the invention provides a magnetic composite abrasive flow polishing method with an angle adjustable mechanism, which enables the surface roughness of the workpiece after polishing to be even and the processing efficiency to be improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a magnetic composite abrasive particle flow polishing method with an angle adjustable mechanism is provided, wherein the abrasive particle flow processing is carried out in low-pressure fluid; the angle adjustable mechanism is arranged in the processing device with magnetic field assistance; the magnetic field assistance is a uniform magnetic field with adjustable strength and vertical to the surface of the workpiece, which is generated by an electromagnet arranged right below the processing device, and under the action of the magnetic field, the magnetic composite abrasive particles in the flow field move to the surface of the workpiece under the action of the magnetic field force; the magnetic composite abrasive particles are composed of magnetic particles and silicon carbide abrasive particles; the magnetic particles are polystyrene microspheres wrapped with nanometer iron powder, and the silicon carbide abrasive particles are adsorbed on the surfaces of the magnetic particles through electrostatic action to form the magnetic composite abrasive particles.
Further, the system for realizing the method comprises a low-pressure abrasive flow loop consisting of a pressure gauge, a processing device, an abrasive cylinder, a pump and a control valve, an electromagnet arranged below the processing device, a stirrer and a water cooling device arranged in the abrasive cylinder and a system controller, wherein under the action of the stirrer and the water cooling device, uniform and constant-temperature abrasive flow is sucked out of the abrasive cylinder through the pump and sent into a pipeline, flows into the processing device equipped with the electromagnet after passing through the control valve and the pressure gauge, and then flows back to the abrasive cylinder through the pipeline, and the whole processing process is automatically controlled through the system controller.
The left side of the adjusting plate is connected with the sliding block through a pin shaft, the right side of the adjusting plate is connected with the horizontal block through a pin shaft, the adjusting screw is screwed into a threaded hole in the horizontal block through a long counter bore in the sliding block, the horizontal block is always kept horizontal due to connection with the adjusting screw, the horizontal block can longitudinally move by changing the depth of the adjusting screw screwed into the threaded hole in the horizontal block, the adjusting plate is driven to rotate around the pin shaft on the left side, the rotating angle is 0-10 degrees, low-pressure abrasive flow enters from the left side during machining, low-pressure abrasive flow flows out from the right side during machining, and the inclination angle of the top plate on the flow channel is adjusted by changing the screwing depth of the adjusting screw. In the machining process, energy loss is caused by friction collision between fluid and abrasive particles and a cavity of a machining device or the surface of a workpiece, pressure in a flow field in the flowing direction is reduced, and then shearing force of the abrasive particles on the surface of the workpiece is reduced. The angle adjustable mechanism can change the inclination angle of the top surface of the processing flow channel within the range of 0-10 degrees, so that the processing flow channel is changed into a wedge-shaped space, the sectional area of the flow channel is gradually reduced along the flow direction of abrasive particles, the pressure reduction in the flow field along the flow direction is compensated, the shearing force reduction on the surface of a workpiece along the flow direction is compensated, the polishing force on the surface of the workpiece is uniformly distributed, and the roughness of the surface of the workpiece after polishing is uniformly distributed.
Furthermore, the low-pressure fluid means that the pressure in the processing device is 0.05-2 MPa. Compared with high-pressure fluid, the flow speed of abrasive particles in the low-pressure fluid in the processing device is low, the shearing force on the surface of a workpiece is small, the material removal amount is small, and the controllability is good.
The magnetic field is a uniform magnetic field which is applied in the wedge-shaped flow channel and has the intensity which is vertical to the surface of the workpiece and adjustable in a range of 0.01-1.00T, the uniform magnetic field is generated by an electromagnet which is arranged right below the processing device, the magnetic field intensity is adjusted by a system controller, and the adjustment of the magnetic field intensity is realized by changing the current in an electromagnet coil.
The magnetic composite abrasive particles are magnetized under the action of a uniform magnetic field, the magnetic field intensity is B, the direction of the magnetic field is vertical to the surface of the workpiece and upwards, and the magnetized magnetic composite abrasive particles flow in the direction vertical to the surface of the workpiece while flowing in the direction parallel to the surface of the workpiece in the wedge-shaped flow passage under the action of a magnetic field force Fm vertical to the surface of the workpiece. Under the action of a magnetic field force, the pressure of the magnetic composite abrasive particles on the surface of the workpiece is increased, and meanwhile, the magnetic composite abrasive particles which are originally distributed in the cross section of the flow channel in a disordered mode are gathered on the surface of the workpiece, so that the residence time of the abrasive particles on the surface of the workpiece is prolonged, the machining efficiency is improved, and the machining time is shortened.
The magnetic composite abrasive particles are composed of magnetic particles and silicon carbide abrasive particles, the magnetic particles are polystyrene microspheres wrapping nanometer iron powder, the particle size is 5-15 mu m, and the mass fraction of the magnetic particles in the abrasive particle flow is 1-5%; the grain diameter of the silicon carbide abrasive grains is 0.2-2 mu m, the mass fraction of the silicon carbide abrasive grains in the abrasive grain flow is 5-15%, and the silicon carbide abrasive grains are adsorbed on the surfaces of the magnetic particles through electrostatic action to form the magnetic composite abrasive grains.
The electrostatic adsorption is realized through PH environment and modification, so that the surface of the silicon carbide abrasive particle is negatively charged, the polystyrene wrapping the nano iron powder is positively charged, and the silicon carbide abrasive particle and the polystyrene are adsorbed together through electrostatic action to form the magnetic composite abrasive particle. The PH environment refers to the abrasive stream liquid being alkaline at PH 10. Since silicon carbide abrasive particles are inevitably slightly oxidized in the production process, a thin layer of silica is generated on the surface of the silicon carbide, and under the alkaline environment of pH 10 of abrasive particle flow liquid, silicon-based alcohol generated by the reaction of the silica and water can combine with hydroxide radical in the water to charge the surface of the silicon carbide with negative electricity. The modification refers to modification of magnetic particles. After the modification of poly diallyl dimethyl ammonium chloride cation polyelectrolyte, the polystyrene microsphere wrapping the nano iron powder is positively charged in alkaline solution. After the treatment, the abrasive particles with negative electricity in the abrasive particle flow and the magnetic particles with positive electricity are adsorbed together through electrostatic interaction to form the composite abrasive particles.
The heat generated by the pump and the throttling of the control valve can cause the temperature of abrasive flow in a processing loop to rise, and the temperature rise of the abrasive flow can cause the viscosity of the abrasive flow to change, so that the polishing force of the surface of a workpiece changes, and finally the polishing quality is reduced. In order to avoid the adverse effect caused by the temperature rise of the abrasive particle flow, a water cooling device is installed in the abrasive particle cylinder, and the cooling water flow of the water cooling device is adjusted through a system controller so as to maintain the temperature of the abrasive particle flow within the range of 15-45 ℃.
The invention has the following beneficial effects: the angle adjustable mechanism compensates pressure drop in the flow field along the flow direction caused by energy loss caused by friction collision between fluid and abrasive particles and a cavity of a processing device or the surface of a workpiece in the processing process, so that the polishing force on the surface of the workpiece is uniformly distributed, the roughness of the surface of each part of the workpiece is consistent after polishing, and the surface quality is improved. The pressure of the abrasive particles on the surface of the workpiece is increased through the assistance of the magnetic field, and meanwhile, the abrasive particles which are originally distributed in the cross section of the flow channel in a disordered manner are gathered on the surface of the workpiece, so that the abrasive particle concentration near the surface of the workpiece is improved, the abrasive particles are fully utilized, the processing efficiency is improved, and the processing time is shortened.
Drawings
FIG. 1 is a schematic view of a processing system.
Fig. 2 is a schematic view of a processing apparatus.
Fig. 3 is a sectional view of the processing apparatus.
Fig. 4 is an exploded view of the processing apparatus.
Fig. 5 is a schematic view of the magnetic field.
Fig. 6 is a schematic diagram of the force applied to the magnetic composite abrasive particle.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 6, a magnetic composite abrasive flow polishing method with an angle adjustable mechanism, wherein the abrasive flow processing is performed in a low-pressure fluid; the angle adjustable mechanism is arranged in the processing device with magnetic field assistance; the magnetic field assistance is a uniform magnetic field with adjustable strength and vertical to the surface of the workpiece, which is generated by an electromagnet arranged right below the processing device, and under the action of the magnetic field, the magnetic composite abrasive particles in the flow field move to the surface of the workpiece under the action of the magnetic field force; the magnetic composite abrasive particles are composed of magnetic particles and silicon carbide abrasive particles; the magnetic particles are polystyrene microspheres wrapped with nanometer iron powder, and the silicon carbide abrasive particles are adsorbed on the surfaces of the magnetic particles through electrostatic action to form the magnetic composite abrasive particles.
The system for realizing the method is shown in figure 1 and comprises a low-pressure abrasive flow loop consisting of a pressure gauge (1), a processing device (2), an abrasive cylinder (6), a pump (8) and a control valve (9), an electromagnet (3) arranged below the processing device (2), a stirrer (4) and a water cooling device (5) arranged in the abrasive cylinder (6) and a system controller (7). The whole processing system realizes automatic control through a system controller (7).
The processing process is as follows: when the system is started, the electromagnet (3) is electrified to generate a uniform magnetic field vertical to the surface of the workpiece, and the magnetic field intensity can be adjusted within the range of 0.01-1.00T through the system controller (7). And starting the stirrer (4) to uniformly stir the magnetic particles and the composite abrasive particles in the abrasive particle cylinder. The pump (8) is started, the control valve (9) is opened, abrasive flow is sent into the machining device (2), and low pressure of 0.05-2 MPa is provided for the angle-adjustable wedge-shaped flow channel space of the machining device (2) for polishing. The water cooling device (5) is started, and the system controller (7) measures the temperature in the abrasive grain cylinder through a thermometer arranged in the abrasive grain cylinder and controls the flow rate of cooling water of the water cooling device (5) to maintain the temperature of the abrasive grain flow within an allowable range.
The angle-adjustable wedge-shaped runner space is realized through an angle-adjustable mechanism in the processing device (2), the processing device (2) is shown in figure 2, the internal structure of the processing device is shown in figure 3, and the component composition of the processing device is shown in figure 4. The machining device is composed of an end cover (201), a screw (202), a sealing ring (203), a sliding block (204), an adjusting screw gland (205), an adjusting screw (206), a cavity (207), a workpiece groove (208), a sealing gasket (209), a horizontal block (210), a pin shaft (211) and an adjusting plate (212). The angle adjustable mechanism is composed of a sliding block (204), an adjusting screw gland (205), an adjusting screw (206), a connecting block (210), a pin shaft (211) and an adjusting plate (212). The left side of the adjusting plate is connected with the sliding block through a pin shaft, the right side of the adjusting plate is connected with the horizontal block through a pin shaft, the adjusting screw is screwed into a threaded hole in the horizontal block through a long counter bore in the sliding block, the horizontal block is always kept horizontal due to connection with the adjusting screw, and the longitudinal movement of the horizontal block can be realized by changing the depth of the adjusting screw screwed into the threaded hole in the horizontal block, so that the adjusting plate is driven to rotate around the pin shaft on the left side, and the rotating angle is 0-10 degrees. When the adjusting screw is screwed into the threaded hole to the maximum depth, the adjusting plate is in a 0-degree horizontal position, and the adjusting screw is located at the right limit position of the long counter bore; when the adjusting screw is screwed into the threaded hole to the minimum depth, the adjusting plate is in the maximum inclined position of 10 degrees, and the adjusting screw is located at the left limit position of the long counter bore. When the screwing-in depth of the adjusting screw is changed, the inclination angle of the adjusting plate is changed, and a wedge-shaped space with an adjustable angle is formed between the adjusting plate and the workshop slot. The longitudinal movement of the adjusting screw is limited by the screw gland, the rotation of the adjusting screw is limited by the self-locking property of the screw thread and the screw gland, and when the position of the adjusting screw is fixed, the position of the adjusting plate is fixed.
The whole angle-adjustable mechanism slides into a groove at the top of the cavity through a sliding block, the horizontal displacement of the angle-adjustable mechanism is limited by end covers at two sides, and after the end covers are connected with the cavity through screws, the angle-adjustable mechanism is completely fixed in the cavity.
The workpiece is placed in the workpiece groove, the workpiece groove slides into the groove at the bottom of the cavity in a sliding block mode, the horizontal displacement of the workpiece groove is limited by the end covers at two sides, and after the end covers are connected with the cavity through the screws, the workpiece groove is completely fixed in the cavity.
The sealing of the whole processing device is realized by two sealing rings and a sealing gasket. The two sealing rings are used for sealing a groove between the end cover and the cavity body, so that abrasive particles are prevented from flowing to the outside of the processing device and leaking; the sealed horizontal piece that is used for angle adjustable mechanism of filling up and end cover between sealed, angular adjustment can cause the horizontal piece in the displacement of vertical direction except that, still can cause the horizontal piece at the micro displacement of horizontal direction, cause and form the gap between horizontal piece right-hand member face and end cover, leak through this gap for preventing that the grit stream from causing the pressure oscillation of both sides about the adjusting plate in the space that adjusting plate and slider pressed from both sides, and then lead to the adjusting plate vibration, influence the stability in wedge runner space, the event is sealed the pad at the horizontal piece right-hand member face additional installation.
And placing the workpiece in a workpiece groove in the processing device, covering end covers at two sides of the processing device, and screwing down the screw. The processing device is connected with the hose through the sealing pipe threads on two sides and is connected into the abrasive flow processing loop.
The magnetic particles are modified, and the polystyrene microspheres wrapping the nano iron powder are positively charged in alkaline solution after being modified by poly diallyl dimethyl ammonium chloride cationic polyelectrolyte.
Preparing abrasive particle flow, adding a 5% potassium hydroxide solution into deionized water to enable the solution to be in an alkaline state with the pH value of 10, and then adding silicon carbide abrasive particles and polystyrene magnetic particles wrapping nano iron powder; the mass fraction of the silicon carbide abrasive particles in the abrasive particle flow is 5-15%, and the particle size is 0.2-2 mu m; the polystyrene magnetic particles wrapping the nanometer iron powder have the mass fraction of 1-5% in the abrasive particle flow and the particle size of 5-15 mu m. As shown in fig. 6, in an alkaline environment, the negatively charged abrasive particles (214) and the positively charged magnetic particles (215) are electrostatically attracted together to form the composite abrasive particles.
Adding the prepared abrasive flow into an abrasive cylinder, and starting a stirrer to make the abrasive flow uniform. And opening the pump and the control valve through the system controller to perform low-pressure abrasive flow polishing processing.
The system controller sets the magnetic field intensity, and the electromagnet (3) arranged right below the processing device (2) applies a uniform magnetic field vertical to the surface of the workpiece in the wedge-shaped flow channel, as shown in figure 5. Under the action of a uniform magnetic field, the magnetic composite abrasive particles are magnetized, and as shown in fig. 6, the magnetized magnetic composite abrasive particles in the low-pressure abrasive particle flow are acted by the magnetic field force vertically pointing to the surface of the workpiece (213), flow in the direction parallel to the surface of the workpiece in the wedge-shaped flow passage and simultaneously flow in the direction vertically pointing to the surface of the workpiece. The existence of the magnetic field force not only increases the pressure of the magnetic composite abrasive particles on the surface of the workpiece, but also enables the magnetic composite abrasive particles which are originally distributed in the cross section of the flow channel in a disordered way to be gathered on the surface of the workpiece, and the residence time of the abrasive particles on the surface of the workpiece is prolonged.
The system controller reads the temperature of the abrasive flow through a thermometer arranged in the abrasive cylinder, and according to the change of the temperature of the abrasive flow, the water cooling device is started and the flow of cooling water is adjusted, so that the temperature of the abrasive flow is controlled within the range of 15-45 ℃.
Claims (8)
1. The polishing method of the magnetic composite abrasive particle flow with the angle adjustable mechanism is characterized in that the abrasive particle flow is processed in low-pressure fluid; the angle adjustable mechanism is arranged in the processing device with magnetic field assistance; the magnetic field assistance is a uniform magnetic field with adjustable strength and vertical to the surface of the workpiece, which is generated by an electromagnet arranged right below the processing device, and under the action of the magnetic field, the magnetic composite abrasive particles in the flow field move to the surface of the workpiece under the action of the magnetic field force; the magnetic composite abrasive particles are composed of magnetic particles and silicon carbide abrasive particles; the magnetic particles are polystyrene microspheres wrapped with nano iron powder, and the silicon carbide abrasive particles are adsorbed on the surfaces of the magnetic particles through electrostatic action to form magnetic composite abrasive particles;
the system for realizing the method comprises a low-pressure abrasive flow loop consisting of a pressure gauge, a processing device, an abrasive cylinder, a pump and a control valve, an electromagnet arranged below the processing device, a stirrer and a water cooling device arranged in the abrasive cylinder and a system controller, wherein under the action of the stirrer and the water cooling device, uniform and constant-temperature abrasive flow is sucked out of the abrasive cylinder through the pump and sent into a pipeline, flows into the processing device provided with the electromagnet through the control valve and the pressure gauge and then flows back to the abrasive cylinder through the pipeline, and the whole processing process is automatically controlled through the system controller;
the angle adjustable mechanism is arranged at the top in the processing device and consists of a sliding block, an adjusting screw gland, an adjusting screw, a horizontal block, a pin shaft and an adjusting plate, wherein the left side of the adjusting plate is connected with the sliding block through the pin shaft, the right side of the adjusting plate is connected with the horizontal block through the pin shaft, the adjusting screw is screwed into a threaded hole in the horizontal block through a long counter bore in the sliding block, the horizontal block is always kept horizontal due to the connection with the adjusting screw, and the longitudinal movement of the horizontal block can be realized by changing the depth of the adjusting screw screwed into the threaded hole in the horizontal block, so that the adjusting plate is driven to rotate around the pin shaft on the left side;
in the machining process, energy loss is caused by friction collision between fluid and abrasive particles and a cavity of a machining device or the surface of a workpiece, pressure in a flow field in the flowing direction is reduced, and further shearing force of the abrasive particles on the surface of the workpiece is reduced, an angle adjustable mechanism can change the inclination angle of the top surface of a machining flow channel within the range of 0-10 degrees, so that the machining flow channel is changed into a wedge-shaped space, the sectional area of the flow channel is gradually reduced in the flowing direction of the abrasive particles, the pressure reduction in the flow field in the flowing direction is compensated, the shearing force reduction in the flowing direction of the surface of the workpiece is compensated, the polishing force on the surface of the workpiece is uniformly distributed, and.
2. The method of claim 1, wherein the low pressure fluid is a fluid at a pressure of 0.05 MPa to 2MPa within the processing tool.
3. The method according to claim 1, wherein the magnetic field is a uniform magnetic field applied in the wedge-shaped flow channel and having an adjustable intensity perpendicular to the surface of the workpiece within a range of 0.01 to 1.00T, and is generated by an electromagnet disposed directly below the processing apparatus, and the intensity of the magnetic field is adjusted by a system controller, and the adjustment of the intensity of the magnetic field is achieved by changing the current in the electromagnet coil.
4. The method of claim 1, wherein the magnetic composite abrasive particles are magnetized by a uniform magnetic field having a magnetic field strength B and a magnetic field direction perpendicular to the workpiece surface, and the magnetized magnetic composite abrasive particles are subjected to a magnetic field force Fm directed perpendicular to the workpiece surface, and flow in the wedge-shaped flow channel in a direction parallel to the workpiece surface while flowing in a direction perpendicular to the workpiece surface.
5. The polishing method of claim 1, wherein the magnetic composite abrasive particles comprise magnetic particles and silicon carbide abrasive particles, the magnetic particles are polystyrene microspheres coated with nano iron powder, the particle size of the polystyrene microspheres is 5-15 μm, and the mass fraction of the polystyrene microspheres in the abrasive particle flow is 1-5%; the grain diameter of the silicon carbide abrasive grains is 0.2-2 mu m, the mass fraction of the silicon carbide abrasive grains in the abrasive grain flow is 5-15%, and the silicon carbide abrasive grains are adsorbed on the surfaces of the magnetic particles through electrostatic action to form the magnetic composite abrasive grains.
6. The method according to claim 1, wherein the electrostatic adsorption is performed by PH environment and modification, so that the surface of the silicon carbide abrasive particle is negatively charged, the polystyrene coated with the nano iron powder is positively charged, and the silicon carbide abrasive particle and the polystyrene coated with the nano iron powder are adsorbed together by electrostatic action to form the magnetic composite abrasive particle; the PH environment refers to the abrasive stream liquid being alkaline at PH 10.
7. The method according to claim 6, wherein the modification refers to modification of magnetic particles, polystyrene microspheres coated with nano iron powder are positively charged in alkaline solution after modification by poly diallyldimethylammonium chloride cationic polyelectrolyte, and after the treatment, the negatively charged abrasive particles and the positively charged magnetic particles in the abrasive particle stream are adsorbed together by electrostatic interaction to form the composite abrasive particles.
8. The method according to claim 1, wherein the pump heating and the control valve throttling cause the temperature of the abrasive flow in the processing circuit to rise, the temperature rise of the abrasive flow causes the viscosity of the abrasive flow to change, the polishing force on the surface of the workpiece changes, and finally the polishing quality is reduced, and in order to avoid the adverse effects caused by the temperature rise of the abrasive flow, a water cooling device is installed in the abrasive cylinder, and the flow rate of cooling water of the water cooling device is adjusted by a system controller to maintain the temperature of the abrasive flow within the range of 15-45 ℃.
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| CN112500800B (en) * | 2020-12-15 | 2022-05-10 | 广东红日星实业有限公司 | Stainless steel polishing wax and preparation method thereof |
| CN115488770A (en) * | 2022-08-10 | 2022-12-20 | 青岛理工大学 | Magnetic field assisted strong grinding trace lubricant supplying and recovering device |
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| CN105922125A (en) * | 2016-05-24 | 2016-09-07 | 广东工业大学 | Magneto-rheological fluid dynamic pressure composite polishing device and method |
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