A method for replenishing the magnetorheological polishing slurry during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet ball heads.

Abstract

A method for replenishing water in the magnetorheological polishing slurry during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet small ball heads is disclosed. This method addresses the problem that in existing magnetorheological polishing processes, water in the slurry evaporates rapidly, affecting the surface accuracy of the polished workpiece and hindering continuous and stable processing. The method includes the following steps: preparing a slurry with a water content of C... i This invention utilizes a magnetorheological polishing slurry to conduct thermo-chemical effect-assisted magnetorheological polishing experiments on permanent magnet ball heads, controlling the temperature of the slurry flowing into the polishing zone. After polishing, the slurry is subjected to a drying weight loss experiment to calculate the mass of water evaporated during polishing. Combined with the polishing time, the amount of water replenished per unit time and per unit mass of slurry at different temperatures is calculated. A water replenishment device is constructed to replenish water into the slurry circulation loop. This invention provides convenience for long-term, stable polishing processes.

Description

Technical Field

[0001] This invention relates to the field of magnetorheological polishing technology for permanent magnet small ball heads, and more specifically, to a method for replenishing water in the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing process of permanent magnet small ball heads. Background Technology

[0002] Thermo-chemical effect-assisted permanent magnet small-ball magnetorheological polishing is a novel multi-energy field composite ultra-precision polishing method. This method couples thermodynamic effects with chemical reactions into the polishing process; that is, while the abrasive grains mechanically remove material from the workpiece, chemical removal is achieved through chemical action. Furthermore, by heating the magnetorheological polishing slurry in a water bath, the viscosity of the slurry is reduced, increasing its fluidity in the polishing zone and thus improving the polishing speed when the abrasive grains shear the workpiece surface. Simultaneously, the chemical reaction rate is also increased, resulting in greater chemical material removal. Therefore, compared to conventional permanent magnet small-ball magnetorheological polishing methods, the thermo-chemical effect-assisted permanent magnet small-ball magnetorheological polishing method significantly improves polishing efficiency, increases polishing output, and reduces processing costs.

[0003] However, during the polishing process, the magnetorheological polishing slurry needs to be heated to 60°C using a water bath and kept constant. This causes the water in the slurry to evaporate rapidly during polishing. As the polishing time increases, the recovered slurry becomes viscous, easily leading to fluctuations and changes in the material removal rate during polishing. This affects the uniform removal of material from the workpiece surface, thus impacting the surface finish accuracy after polishing. If not replaced in time, the slurry may even dry out, clogging the delivery pipes and causing polishing interruptions, hindering continuous and stable polishing. Therefore, a method for continuously replenishing water to the magnetorheological polishing slurry is urgently needed to maintain a stable water content, enabling long-term and stable polishing operations. Summary of the Invention

[0004] The technical problem to be solved by this invention is:

[0005] In the existing thermo-chemical effect-assisted permanent magnet ball head magnetorheological polishing process, the water in the water-based magnetorheological polishing slurry will evaporate rapidly, causing the slurry to become viscous or even dry out, which will affect the surface accuracy of the workpiece and is not conducive to the continuous and stable processing.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] This invention provides a method for replenishing the magnetorheological polishing slurry during the magnetorheological polishing process of a permanent magnet ball head assisted by thermo-chemical effects, comprising the following steps:

[0008] S1, the prepared mass is m w The water content by mass is C i The magnetorheological polishing slurry was used to conduct thermo-chemical effect-assisted magnetorheological polishing experiments on permanent magnet small ball heads. Polishing was carried out continuously for several hours, while the temperature of the magnetorheological polishing slurry flowing into the polishing processing area was controlled at t1 by a constant temperature water bath.

[0009] S2. After the polishing experiment, a small amount of magnetorheological polishing fluid was added to a dry container of known mass and weighed. A drying weight loss experiment was conducted, and the mass fraction C of water in the magnetorheological polishing fluid after polishing was calculated. w ;

[0010] S3. Calculate the mass of water evaporated during the polishing process, and in conjunction with the polishing time, calculate the mass of water that needs to be replenished per unit time and per unit mass of magnetorheological polishing fluid at temperature t1.

[0011] S4. Prepare a new magnetorheological polishing slurry of the same concentration and conduct a thermo-chemical effect-assisted magnetorheological polishing experiment on a permanent magnet ball head. Adjust the temperature of the magnetorheological polishing slurry flowing into the polishing zone in a constant-temperature water bath to t2…t. n S2 to S3 were repeated to obtain the water replenishment mass of magnetorheological polishing fluid per unit time and per unit mass at different temperatures;

[0012] S5. Construct a water replenishment device to replenish water to the magnetorheological polishing fluid circulation loop based on the water replenishment mass per unit time and per unit mass of magnetorheological polishing fluid at different temperatures.

[0013] Furthermore, in the magnetorheological polishing experiment in S1, polishing was carried out continuously for 3 to 4 hours.

[0014] Furthermore, the temperature t1 mentioned in S1 is 20℃, and the temperature of the magnetorheological polishing fluid flowing into the polishing processing area is adjusted sequentially in the constant temperature water bath to 30℃, 40℃, 50℃ and 60℃.

[0015] Furthermore, the humidity was controlled at 40±0.2% during the thermo-chemical effect-assisted magnetorheological polishing experiment of the permanent magnet ball head in S1.

[0016] Furthermore, S2 includes the following steps:

[0017] S21. Weigh the container that has been dried to constant weight;

[0018] S22. After the polishing experiment, take 10ml to 20ml of magnetorheological polishing fluid and add it to the container for weighing.

[0019] S23. Place the container containing the rheological polishing slurry in a drying oven and dry it to constant weight;

[0020] S24. Calculate the mass fraction of water in the magnetorheological polishing fluid after the polishing experiment.

[0021] Furthermore, the conditions for drying the container containing the rheological polishing slurry in the drying oven as described in S23 are: a temperature of 80°C and a drying time of 12 hours.

[0022] Furthermore, in S24, the mass fraction of water in the magnetorheological polishing slurry after the polishing experiment is calculated as follows:

[0023]

[0024] Where m1 is the mass of the dried container, m2 is the mass of the magnetorheological polishing liquid and the container before drying, and m3 is the mass of the magnetorheological polishing liquid and the container after drying.

[0025] Furthermore, S3 calculates the mass of water evaporated during the polishing process, specifically as follows:

[0026] C i m w -C w (m w -m z ) = m z

[0027] Where, m z —Mass of water evaporated during polishing (g); C i —Mass fraction of water in the magnetorheological polishing slurry before polishing; m w —Mass of magnetorheological polishing slurry before polishing (g).

[0028] Furthermore, the water replenishment device includes: a storage bottle, a water outlet pipe, and a flow rate valve. The storage bottle is used to store deionized water. One end of the water outlet pipe is connected to the storage bottle, and the water outlet end of the water outlet pipe is connected to the storage stirrer in the magnetorheological polishing fluid circulation loop. The flow rate valve controls the flow rate of deionized water at different magnetorheological polishing fluid temperatures.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This invention discloses a method for replenishing the magnetorheological polishing slurry during the magnetorheological polishing process of a permanent magnet ball head assisted by thermo-chemical effects. This method can maintain a stable concentration of the magnetorheological polishing slurry during the polishing process, which provides convenience for long-term and stable polishing operations. At the same time, the continuous and stable concentration of the magnetorheological polishing slurry is conducive to the uniform removal of material from the workpiece surface and to improving the surface accuracy of the workpiece after polishing.

[0031] The method of this invention requires no modification to existing equipment, is low in cost, and can meet the water replenishment requirements at different magnetorheological polishing fluid temperatures during the polishing process, exhibiting good adaptability and adjustability.

[0032] The method of this invention is universal and can be used for evaporation and replenishment of water-based liquids in other processing steps. Attached Figure Description

[0033] Figure 1 This is a flowchart of the method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet ball heads in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the thermo-chemical effect-assisted permanent magnet ball head magnetorheological polishing device in an embodiment of the present invention;

[0035] Figure 3 This is a flowchart illustrating the water replenishment process of the water replenishment device in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-C-axis rotary table, 2-U-axis connecting bracket, 3-tool spindle fixing bracket, 4-tool spindle, 5-polishing tool, 6-magnetorheological polishing fluid collection tank, 7-horizontal worktable, 8-workpiece spindle protective cover, 9-workpiece to be processed, 10-workpiece spindle, 11-magnetorheological polishing fluid delivery pipe, 12-U-axis protective cover, 13-U-axis, 14-constant temperature water bath. Detailed Implementation

[0038] In the description of this invention, it should be noted that the terms used in the various embodiments, such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation, are only used to simplify the description of the positional relationships based on the accompanying drawings and do not mean that the components and devices referred to must be operated in accordance with the specific orientations and defined operations, methods, and structures in the specification. Such directional terms do not constitute a limitation of this invention.

[0039] In the description of this invention, it should be noted that the terms "first," "second," and "third" mentioned in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Specific Implementation Plan 1: Combining Figures 1 to 3As shown, this invention provides a method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads, such as... Figure 1 As shown, it includes the following steps:

[0042] S1, the prepared mass is m w The water content by mass is C i The magnetorheological polishing slurry was used to conduct thermo-chemical effect-assisted magnetorheological polishing experiments on permanent magnet small ball heads. Polishing was carried out continuously for several hours, while the temperature of the magnetorheological polishing slurry flowing into the polishing processing area was controlled at t1 by a constant temperature water bath.

[0043] S2. After the polishing experiment, a small amount of magnetorheological polishing fluid was added to a dry container of known mass and weighed. A drying weight loss experiment was conducted, and the mass fraction C of water in the magnetorheological polishing fluid after polishing was calculated. w ;

[0044] S3. Calculate the mass of water evaporated during the polishing process, and in conjunction with the polishing time, calculate the mass of water that needs to be replenished per unit time and per unit mass of magnetorheological polishing fluid at temperature t1.

[0045] S4. Prepare a new magnetorheological polishing slurry of the same concentration and conduct a thermo-chemical effect-assisted magnetorheological polishing experiment on a permanent magnet ball head. Adjust the temperature of the magnetorheological polishing slurry flowing into the polishing zone in a constant-temperature water bath to t2…t. n S2 to S3 were repeated to obtain the water replenishment mass of magnetorheological polishing fluid per unit time and per unit mass at different temperatures;

[0046] S5. Construct a water replenishment device to replenish water to the magnetorheological polishing fluid circulation loop based on the water replenishment mass per unit time and per unit mass of magnetorheological polishing fluid at different temperatures.

[0047] like Figure 2As shown, the magnetorheological polishing device used in this embodiment is a four-axis linkage magnetorheological polishing machine tool (application number: CN201710186959.2), including three linear motion platforms (X, Y, and Z), a C-axis rotary table 1, two precision fine-tuning linear feed platforms (U-axis 13 and V-axis), a tool spindle 4, and a workpiece spindle 10. A horizontal worktable 7 is mounted on the X-axis and Y-axis linear platforms. The control system controls the X-axis and Y-axis linear platforms to achieve horizontal work. The worktable 8 moves linearly along the X and Y axes, both of which are horizontal. The tool spindle 4 is mounted on the Z-axis linear platform, and its linear movement along the Z-axis is achieved through a control system. The Z-axis is vertical. The C-axis rotary table 1 is used to realize the rotational movement of the tool spindle 4 along the Z-axis. The polishing tool 5 uses a small-diameter permanent magnet spherical polishing head, which is mounted on the output end of the tool spindle 4 through a precision chuck to achieve high-speed rotation during machining. The angle between the tool spindle 4 and the horizontal plane is 40°. The tool spindle 4 is suspended below the U-axis 13 via the tool spindle mounting bracket 3, and the U-axis 13 is equipped with a U-axis protective cover 12. The U-axis 13 is rigidly connected to the C-axis rotary table 1 via the U-axis connecting bracket 2. The V-axis is installed below the C-axis rotary table 1, and its lower end is connected to the tool spindle mounting bracket 3. The X-axis and Y-axis directions of the ball center position of the polishing tool 5 are finely adjusted via the U-axis 13 and the V-axis. The workpiece spindle 10 is equipped with a workpiece spindle protective cover 8 and is mounted on the horizontal worktable via the workpiece spindle protective cover 8. 7. On the upper surface, the axis of the workpiece spindle is parallel to the Y-axis movement direction. The workpiece 9 to be processed is clamped at the output end of the workpiece spindle 10. The equipment is equipped with a magnetorheological polishing slurry delivery pipe 11 and a magnetorheological slurry collection tank 6. The magnetorheological slurry collection tank 6 is located below the nozzle of the magnetorheological polishing slurry delivery pipe 11. The magnetorheological polishing slurry delivery pipe 11 is adjusted to make the magnetorheological slurry drip onto the polishing tool 5, so as to achieve a continuous supply of magnetorheological slurry. The magnetorheological slurry collection tank 6 is used for the outflowing magnetorheological slurry and the magnetorheological slurry splashed from the polishing head during the polishing process. The other end of the magnetorheological polishing slurry delivery pipe 11 is immersed in an electrically heated constant temperature water bath, and the magnetorheological polishing slurry flowing through this section is heated to a specified temperature.

[0048] Specific Implementation Plan Two: The magnetorheological polishing experiment in S1 is carried out continuously for 3-4 hours. All other aspects of this implementation plan are the same as Specific Implementation Plan One.

[0049] Specific Implementation Scheme 3: The temperature t1 mentioned in S1 is 20℃, and the temperature of the magnetorheological polishing fluid flowing into the polishing processing area is controlled by adjusting the constant temperature water bath in S4 to 30℃, 40℃, 50℃ and 60℃ respectively. All other aspects of this implementation scheme are the same as Specific Implementation Scheme 1.

[0050] Specific Implementation Plan Four: During the thermo-chemical effect-assisted magnetorheological polishing experiment of the permanent magnet ball head in S1, the humidity is controlled at 40±0.2%. All other aspects of this implementation plan are the same as Specific Implementation Plan One.

[0051] Specific implementation plan five: S2 includes the following steps:

[0052] S21. Weigh the container that has been dried to constant weight;

[0053] S22. After the polishing experiment, take 10ml to 20ml of magnetorheological polishing fluid and add it to the container for weighing.

[0054] S23. Place the container containing the rheological polishing slurry in a drying oven and dry it to constant weight;

[0055] S24. Calculate the mass fraction of water in the magnetorheological polishing solution after the polishing experiment. This implementation plan is otherwise the same as specific implementation plan one.

[0056] Specific Implementation Scheme Six: The conditions for drying the container containing the rheological polishing slurry in the drying oven as described in S23 are: temperature 80℃, drying time 12 hours. All other aspects of this implementation scheme are the same as Specific Implementation Scheme Five.

[0057] Specific Implementation Plan Seven: In S24, the mass fraction of water in the magnetorheological polishing fluid after the polishing experiment is calculated as follows:

[0058]

[0059] Where m1 is the mass of the dried container, m2 is the mass of the magnetorheological polishing liquid and the container before drying, and m3 is the mass of the magnetorheological polishing liquid and the container after drying. All other aspects of this implementation scheme are the same as in specific implementation scheme five.

[0060] Specific implementation plan eight: In S3, the mass of water evaporated during the polishing process is calculated as follows:

[0061] C i m w -C w (m w -m z ) = m z (2)

[0062] Where, m z —Mass of water evaporated during polishing (g); C i —Mass fraction of water in the magnetorheological polishing slurry before polishing; m w —The mass (g) of the magnetorheological polishing slurry before polishing. All other aspects of this implementation plan are the same as in Specific Implementation Plan One.

[0063] Because chemical substances are consumed during the polishing process, there is a loss in the mass of the polishing slurry. However, the amount of chemical substances consumed is much smaller than the amount of water evaporated; therefore, the change in the mass of the chemical substances is negligible. In this embodiment, the drying process is carried out in a vacuum drying oven. Therefore, the components in the polishing slurry will not react with components in the air. For example, for a strongly alkaline magnetorheological polishing slurry containing sodium hydroxide, the sodium hydroxide will not react with carbon dioxide in the air, and there is no influence of air on the drying weight loss experiment results.

[0064] Specific Implementation Scheme Nine: The water replenishment device includes a storage bottle, a water outlet pipe, and a flow rate valve. The storage bottle is used to store deionized water. One end of the water outlet pipe is connected to the storage bottle, and the outlet end of the water outlet pipe is connected to the storage stirrer in the magnetorheological polishing fluid circulation loop. The flow rate valve controls the flow rate of deionized water at different magnetorheological polishing fluid temperatures. All other aspects of this implementation scheme are the same as in Specific Implementation Scheme One.

[0065] The following embodiments are used to verify the effectiveness of the present invention.

[0066] Example 1: A method for replenishing the magnetorheological polishing slurry during the thermo-chemical effect-assisted magnetorheological polishing of a permanent magnet ball head, comprising the following steps:

[0067] S1, preparation mass m w The water content C is 3235g. i A magnetorheological polishing slurry with a content of 28.4% was used. The indoor humidity was controlled at 40±0.2%. A magnetorheological polishing experiment assisted by thermo-chemical effect was carried out on a permanent magnet ball head. The processing parameters were: polishing head speed 7000 rpm, workpiece speed 60 rpm, polishing gap 0.1 mm, and continuous polishing for 3 hours. At the same time, the temperature of the magnetorheological polishing slurry flowing into the polishing area was controlled at 20℃ by a constant temperature water bath.

[0068] S2. Place the beaker in a vacuum drying oven and dry it to constant weight. Cool it and weigh it as m1. After the polishing experiment, add 10ml of magnetorheological polishing liquid to the beaker and weigh it as m2. Place the beaker containing the rheological polishing liquid in a vacuum drying oven at 80℃ and dry it for 12 hours to constant weight. Cool it and weigh the beaker at this time as m3. Calculate the mass fraction C of water in the magnetorheological polishing liquid after polishing according to formula (1). w ;

[0069] S3. Calculate the mass of water evaporated during polishing according to formula (2), and calculate the mass of water that the magnetorheological polishing fluid needs to replenish per unit time at temperature t1, in conjunction with the polishing time.

[0070] S4. Prepare a new magnetorheological polishing slurry of the same concentration and mass, and conduct a thermo-chemical effect-assisted permanent magnet ball head magnetorheological polishing experiment. Adjust the temperature of the magnetorheological polishing slurry flowing into the polishing processing area in the constant temperature water bath to 30℃, 40℃, 50℃ and 60℃ in sequence, and repeat S2 to S3 respectively to obtain the water replenishment mass of the magnetorheological polishing slurry per unit time at different temperatures. Table 1 shows the water replenishment mass of the magnetorheological polishing slurry per unit time at each temperature.

[0071] Table 1

[0072]

[0073] S5, such as Figure 3 As shown, a water replenishment device is constructed, comprising: a storage bottle, a water outlet pipe, and a flow rate valve. The storage bottle stores deionized water. One end of the water outlet pipe is connected to the storage bottle, and the outlet end of the water outlet pipe is connected to a storage stirrer in the magnetorheological polishing fluid circulation loop. The flow rate valve controls the flow rate of deionized water at different magnetorheological polishing fluid temperatures. 500 ml of deionized water is added to the storage bottle of the water replenishment device. Based on the water replenishment mass of the magnetorheological polishing fluid per unit time at different temperatures, water is replenished to the magnetorheological polishing fluid circulation loop through the water replenishment device.

[0074] After replenishing water using a water replenishment device, the change in the water content of the magnetorheological polishing fluid before and after polishing was detected. It was found that the water content changed within 1%, further proving the effectiveness of the water replenishment method of the magnetorheological polishing fluid in the magnetorheological polishing process of the permanent magnet small ball head assisted by the thermo-chemical effect.

[0075] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for replenishing water in the magnetorheological polishing slurry during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet microspheres, characterized in that, Includes the following steps: S1, the prepared mass is m w The water content by mass is C i The magnetorheological polishing slurry was used to conduct thermo-chemical effect-assisted magnetorheological polishing experiments on permanent magnet small ball heads. Polishing was carried out continuously for several hours, while the temperature of the magnetorheological polishing slurry flowing into the polishing processing area was controlled at t1 by a constant temperature water bath. S2. After the polishing experiment, a small amount of magnetorheological polishing fluid was added to a dry container of known mass and weighed. A drying weight loss experiment was conducted, and the mass fraction C of water in the magnetorheological polishing fluid after polishing was calculated. w ; S3. Calculate the mass of water evaporated during the polishing process, and in conjunction with the polishing time, calculate the mass of water that needs to be replenished per unit time and per unit mass of magnetorheological polishing fluid at temperature t1. S4. Prepare a new magnetorheological polishing slurry of the same concentration and conduct a thermo-chemical effect-assisted magnetorheological polishing experiment on a permanent magnet ball head. Adjust the temperature of the magnetorheological polishing slurry flowing into the polishing zone in a constant-temperature water bath to t2…t. n S2 to S3 were repeated to obtain the water replenishment mass of magnetorheological polishing fluid per unit time and per unit mass at different temperatures; S5. Construct a water replenishment device to replenish water to the magnetorheological polishing fluid circulation loop based on the water replenishment mass per unit time and per unit mass of magnetorheological polishing fluid at different temperatures.

2. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 1, characterized in that, In the magnetorheological polishing experiment in S1, polishing was carried out continuously for 3 to 4 hours.

3. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 1, characterized in that, The temperature t1 mentioned in S1 is 20℃, and the temperature of the magnetorheological polishing fluid flowing into the polishing processing area is adjusted sequentially in the constant temperature water bath to 30℃, 40℃, 50℃ and 60℃.

4. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 1, characterized in that, The humidity was controlled at 40±0.2% during the thermo-chemical effect-assisted magnetorheological polishing experiment of permanent magnet small ball head in S1.

5. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 1, characterized in that, S2 includes the following steps: S21. Weigh the container that has been dried to constant weight; S22. After the polishing experiment, take 10ml to 20ml of magnetorheological polishing fluid and add it to the container for weighing. S23. Place the container containing the rheological polishing slurry in a drying oven and dry it to constant weight; S24. Calculate the mass fraction of water in the magnetorheological polishing fluid after the polishing experiment.

6. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 5, characterized in that, The conditions for drying the container containing the rheological polishing slurry in the drying oven as described in S23 are: temperature of 80°C and drying time of 12 hours.

7. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 5, characterized in that, In S24, the mass fraction of water in the magnetorheological polishing fluid after the polishing experiment is calculated as follows: Where m1 is the mass of the dried container, m2 is the mass of the magnetorheological polishing liquid and the container before drying, and m3 is the mass of the magnetorheological polishing liquid and the container after drying.

8. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 1, characterized in that, S3 calculates the mass of water evaporated during the polishing process, specifically as follows: C i m w -C w (m w -m z )=m z Where, m z —Mass of water evaporated during polishing (g); C i —Mass fraction of water in the magnetorheological polishing slurry before polishing; m w —Mass of magnetorheological polishing slurry before polishing (g).

9. The method for replenishing the magnetorheological polishing fluid during the thermo-chemical effect-assisted magnetorheological polishing of permanent magnet spherical heads according to claim 1, characterized in that, The water replenishment device includes: a storage bottle, a water outlet pipe, and a flow rate valve. The storage bottle is used to store deionized water. One end of the water outlet pipe is connected to the storage bottle, and the water outlet end of the water outlet pipe is connected to the storage stirrer in the magnetorheological polishing fluid circulation loop. The flow rate valve controls the flow rate of deionized water at different magnetorheological polishing fluid temperatures.

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