Airflow-assisted shear rheological polishing device and method adopting wedge-shaped structure polishing wheel

Abstract

The invention discloses an airflow-assisted shear rheological polishing device and method adopting a wedge-shaped structure polishing wheel. The polishing device comprises a base, and a polishing groove, a polishing wheel, a main shaft and a lifting mechanism are arranged on the base; the lifting mechanism is used for driving the polishing wheel to move vertically. A set of wedge-shaped structures are arranged on the outer surface of the polishing wheel in the axial direction at intervals, and wheel ventilation holes are formed between every two adjacent wedge-shaped structures. One end of the main shaft is connected with the polishing wheel, and the other end of the main shaft is connected with the servo motor; the polishing wheel and the main shaft are both of a hollow structure, and the interiors of the polishing wheel and the main shaft communicate. A shaft vent hole is formed in the main shaft, and the shaft vent hole is communicated with an air pump through an air pipe; a clamp used for clamping a workpiece and a blade stirring wheel used for stirring polishing liquid are arranged in the polishing groove. Through the gas pressure output by the gas pump, the fluid dynamic pressure of the polishing solution and the wedge-shaped pressure brought by the wedge-shaped structure, the fitting degree of the polishing solution and the curved surface is improved, and the uniform and efficient polishing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of complex surface polishing, and in particular to an airflow-assisted shear rheological polishing device and method using a wedge-shaped polishing wheel. Background Art

[0002] In the field of optics, microstructured surfaces are widely used in optical components such as diffusers, lens arrays, and gratings. As the performance requirements of optical components continue to break through the technical limits, the demand for high-precision microstructured optical components is rapidly increasing. At present, ultra-precision polishing technology is the preferred method for manufacturing microstructured surfaces of optical components. However, the variability of the curvature of the complex surface of optical components makes it difficult for the curvature of the polishing tool surface to match the curvature of the polished surface. Conventional ultra-precision polishing technology is difficult to perform deterministic polishing on workpieces with complex contour surfaces.

[0003] Deterministic polishing technology achieves quantitative and fixed-point removal of workpiece surface materials by controlling the material removal function, dwell time and polishing trajectory of the polishing tool. It has been widely used in ultra-precision machining of large-scale complex curved surface parts. How to achieve deterministic polishing with high quality, high efficiency and low cost has always been a research hotspot in the field of polishing technology. In recent years, scholars in the field of ultra-precision machining have developed a series of typical deterministic polishing methods to meet the requirements of modern parts precision, such as: airbag polishing, magnetorheological polishing, ion beam polishing, jet polishing, shear rheological polishing, etc. However, all of the above polishing methods have some limitations: the relative position accuracy between the airbag and the workpiece is difficult to maintain in airbag polishing; magnetorheological polishing requires expensive equipment to apply a magnetic field; ion beam polishing has extremely harsh requirements on the vacuum environment; and there is agglomeration of abrasives in jet polishing. Shear rheological polishing uses the "shear thickening" phenomenon of non-Newtonian fluids under shear stress to achieve polishing of complex curved surfaces; the polishing liquid has fluidity and can fit with the complex curved surface to achieve uniform and highly consistent polishing. For example, Duan Shixiang used SiO2 and diamond mixed abrasive to polish K9 glass in his thesis "Study on the Material Removal Function Characteristics of Deterministic Mechanorheological Polishing". After 55 minutes of polishing, the surface roughness of the workpiece dropped from Sa 233.1 nm to Sa 0.9 nm. However, when using conventional shear rheological polishing devices to polish workpiece surfaces with complex contours, if there are structural areas such as grooves and slits on the workpiece surface, the abrasive particles and solid particles in the polishing liquid are easily deposited and blocked therein, and these areas cannot be effectively polished, which has limitations; and the polishing wheel with a smooth wall cannot effectively constrain the polishing liquid, so that slippage occurs between the polishing wheel wall and the polishing liquid, and the polishing pressure and relative speed generated during the polishing process are low, and the polishing efficiency is poor. Summary of the invention

[0004] In order to overcome the above problems existing in the prior art, the present application provides an airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel; the polishing device designs the polishing wheel into a wedge-shaped structure, which enhances the driving force and adhesion of the polishing wheel on the polishing liquid; at the same time, the polishing wheel is designed as a hollow structure, and gas can be delivered to the polishing wheel through an air pump during polishing, and then ejected from the vent holes on its surface. On the one hand, the gas is blown into the polishing liquid to produce bubbles, and the bursting of the bubbles can form an impact on the surface of the workpiece, thereby increasing the normal pressure of the "particle clusters" in the polishing liquid on the surface of the polished workpiece. On the other hand, when the gas is blown to the surface of the workpiece, the solid phase particles and abrasive particles deposited in the grooves and slits will be blown away, so that the solid phase particles and abrasive particles are recombined, so that the surface of the workpiece with a complex contour can be polished more effectively, and the polishing effect is good. Correspondingly, the present application also provides an airflow-assisted shear rheological polishing method using a wedge-shaped polishing wheel.

[0005] For the polishing device, the technical solution of this application is:

[0006] An airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel comprises a base; the base is provided with a polishing groove, a polishing wheel, a main shaft and a lifting mechanism; the polishing groove is used to hold polishing liquid; the polishing wheel is located above the polishing groove, and a group of wedge-shaped structures are axially spaced on the outer surface of the polishing wheel; one end of the main shaft is connected to the polishing wheel, and the other end is connected to a servo motor; the polishing wheel and the main shaft are both hollow structures, and the interiors of the two are interconnected; a wheel air vent is provided on the polishing wheel between two adjacent wedge-shaped structures; a shaft air vent is provided on the main shaft; the shaft air vent is connected to an air pump through an air pipe; the lifting mechanism is connected to the polishing wheel, and is used to drive the polishing wheel to move up and down, so that a polishing gap is formed between the polishing wheel and the polishing groove; a clamp for clamping a workpiece and a blade stirring wheel for stirring the polishing liquid are provided in the polishing groove.

[0007] Compared with the prior art, the airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel in the present application designs the polishing wheel into a wedge-shaped structure, thereby enhancing the driving force and adhesion of the polishing wheel on the polishing liquid, and can generate a relatively stable velocity field and pressure field while effectively driving and constraining the polishing liquid; the polishing device also designs the polishing wheel into a hollow structure, and gas can be delivered to the polishing wheel through an air pump during polishing, and then sprayed out from the air holes on its surface. On the one hand, the gas is blown into the polishing liquid to generate bubbles, and the bursting of the bubbles can impact the surface of the workpiece, thereby increasing the normal pressure of the "particle clusters" in the polishing liquid on the surface of the polished workpiece. At this time, under the combined effect of gas pressure, fluid dynamic pressure of the polishing liquid and wedge pressure brought by the wedge structure, the fit between the polishing liquid and the workpiece surface can be improved, and uniform polishing of different positions on the workpiece surface can be achieved, achieving a good mirror effect, and the fluidity of the polishing liquid can be improved, thereby improving the polishing efficiency; on the other hand, when the gas is blown toward the concave and slits on the surface of the workpiece, the solid particles and abrasive particles deposited in the cavities will be blown away, so that the solid particles and abrasive particles can be recombined, thereby more effectively polishing the surface of the workpiece with a complex contour, reducing the roughness of the workpiece surface, and achieving a good polishing effect.

[0008] As an optimization, in the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, the outer sleeve of the main shaft is provided with a sealing sleeve, and the main shaft can rotate relative to the sealing sleeve; a cavity is formed between the sealing sleeve and the main shaft; a sleeve through hole is opened on the sealing sleeve, and the end of the air pipe is connected to the sleeve through hole. Therefore, during polishing, the main shaft rotates and the air pipe does not need to rotate synchronously, and the implementation difficulty is relatively low. Further, flanges are provided at both ends of the inner part of the sealing sleeve; a rolling bearing is provided on the inner side of the flange, and the main shaft is inserted into the rolling bearing; a sealing ring is provided on the outer side of the flange, and the sealing ring is sleeved on the main shaft. The provision of the rolling bearing can reduce the friction coefficient during the rotation of the main shaft and ensure its rotation accuracy; the provision of the sealing ring can seal the connection between the sealing sleeve and the main shaft to prevent the gas in the sealing sleeve from leaking through the connection gap. In addition, the provision of the internal flange of the sealing sleeve can play a positioning role when installing the rolling bearing, and can also assist the sealing ring to better seal the sealing sleeve.

[0009] As an optimization, in the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, a polishing liquid circulation device is also provided on the base; the polishing liquid circulation device is connected to the polishing tank through a liquid delivery pipeline to form a closed loop circuit. Thus, the recycling of the polishing liquid can be achieved, reducing costs. Furthermore, a dripping device is also provided on the base for adding water to the polishing tank. After the polishing liquid is used for a long time, the water will evaporate, leaving solid precipitates; after adding water to these solid precipitates, new polishing liquid can be generated and put into use again, thereby achieving long-term high-quality circulation processing of the polishing liquid.

[0010] As an optimization, in the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, an X-axis screw slide and a Y-axis screw slide are provided on the base for adjusting the position of the polishing wheel; the X-axis screw slide is fixed on the base, and the Y-axis screw slide is slidably connected to the X-axis screw slide through a gantry; the lifting mechanism is slidably connected to the Y-axis screw slide. At this time, the movement of the polishing wheel in the front-back and left-right directions can be controlled by the X- and Y-axis screw slides to adjust the position of the polishing wheel, so that it can adapt to different models of workpieces to be processed, and has good versatility; and the use of a screw slide to change the position of the polishing wheel has high adjustment accuracy.

[0011] As an optimization, in the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, the lifting mechanism is provided with an L-shaped connecting plate, and the sealing sleeve and the servo motor are fixed to the L-shaped connecting plate. In this case, the assembly is convenient and easy to implement. The lifting mechanism can use a screw slide.

[0012] As an optimization, in the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, an arc-shaped protective cover is provided above the polishing wheel to prevent the polishing liquid from splashing during the polishing process and causing pollution to the surrounding environment.

[0013] As an optimization, in the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, the polishing groove is a hexagonal structure. This can better improve the flow field distribution of the polishing liquid in the polishing groove, thereby improving the cutting force of the polishing liquid on the complex curved surface of the workpiece, and achieving a uniform and consistent polishing effect.

[0014] For the polishing method, the technical solution of this application is:

[0015] An airflow-assisted shear rheological polishing method using a wedge-shaped polishing wheel is implemented using the aforementioned airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel of the present application; specifically, the following steps are included: S1, mounting the workpiece to be processed on a fixture of a polishing tank, and starting a lifting mechanism to adjust the position of the polishing wheel so that the gap between its bottom and the polishing tank is 1 to 3 mm; S2, adding non-Newtonian fluid polishing liquid into the polishing liquid tank so that the polishing liquid submerges the wedge-shaped structure at the bottom of the polishing wheel; S3, starting a blade stirring wheel to stir the polishing liquid, and starting a servo motor to drive the polishing wheel to rotate, so that a relative motion is formed between the polishing wheel and the polishing liquid, and the polishing liquid undergoes shear thickening to polish the surface of the workpiece; at the same time, starting an air pump to output airflow, and the airflow is input into the main shaft through an air pipe and ejected from the wheel vent on the polishing wheel.

[0016] Compared with the prior art, the airflow-assisted shear rheological polishing method of the present application adopts a wedge-shaped structure polishing wheel. During polishing, gas is delivered to the polishing wheel through an air pump and then ejected from the air holes on its surface. On the one hand, gas is blown into the polishing liquid to generate bubbles. The bursting of the bubbles can impact the surface of the workpiece, thereby increasing the normal pressure of the "particle clusters" in the polishing liquid on the surface of the polished workpiece. At this time, under the combined action of gas pressure, fluid dynamic pressure of the polishing liquid and wedge pressure brought by the wedge structure, the polishing efficiency is improved, and at the same time, the fit between the polishing liquid and the workpiece surface is improved, thereby achieving uniform polishing of different positions on the workpiece surface and achieving a good mirror effect. On the other hand, the gas can blow away the solid phase particles and abrasive particles deposited in the grooves and slits on the workpiece surface, so that the solid phase particles and the abrasive particles are recombined, so that the surface of the workpiece with a complex contour can be polished more effectively, the roughness of the workpiece surface can be reduced, and the polishing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel of the present application;

[0018] Figure 2 is a schematic diagram of the structure of the polishing groove in the embodiment of the present application;

[0019] Figure 3 is a schematic structural diagram of a polishing ventilation mechanism in an embodiment of the present application;

[0020] Figure 4 yes Figure 2 A cross-sectional view of the polished ventilation mechanism in FIG.

[0021] Figure 5 is a schematic structural diagram of the main shaft in an embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of the assembly of the polishing wheel, the sealing sleeve and the L-shaped connecting plate in the embodiment of the present application;

[0023] Figure 7 This is a polishing principle diagram of the airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel of the present application;

[0024] Figure 8 It is a schematic diagram of the airflow blowing away the solid phase particles and abrasive particles blocked in the concave and narrow slits on the surface of the workpiece during polishing by the airflow assisted shear rheological polishing device of the present application.

[0025] The markings in the accompanying drawings are: 1-base; 2-polishing groove, 21-clamp, 22-blade stirring wheel, 23-base; 3-polishing wheel, 31-wedge structure, 32-wheel body, 33-wheel cover, 301-wheel vent; 4-spindle, 401-shaft vent; 5-lifting mechanism; 6-servo motor; 7-air pump, 71-trachea; 8-sealing sleeve, 81-flange, 82-sealing cover plate, 801-cavity, 802-sleeve through hole; 9-rolling bearing; 10-sealing ring; 11-polishing liquid circulation device; 12-infusion pipeline; 13-drip device; 14-X-axis screw slide; 15-Y-axis screw slide; 16-gantry; 17-L-type connecting plate; 18-arc-shaped protective cover; 19-mouth-shaped connecting plate; 20-workpiece; 24-solid phase particles; 25-abrasive particles; 26-airflow. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments; the contents not described in detail in the following embodiments are all common technical knowledge in the art.

[0027] In the description of the present invention, it is necessary to understand that the terms: "one end", "the other end", "surface", "axial", "inside", "outside", "bottom", "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] See also Figures 1 to 5The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel of the present application comprises a base 1; the base 1 is provided with a polishing groove 2, a polishing wheel 3, a spindle 4 and a lifting mechanism 5; the polishing groove 2 is used to hold the polishing liquid; the polishing wheel 3 is located above the polishing groove 2, and a group of wedge-shaped structures 31 are provided on the outer surface of the polishing wheel 3 at intervals along the axial direction (when the polishing wheel 3 rotates, the wedge-shaped structures 31 can give a wedge-shaped pressure downward to the polishing liquid); one end of the spindle 4 is connected to the polishing wheel 3, and the other end is connected to the servo motor 6 (can be connected by a key), and is driven to rotate by the servo motor 6; the polishing wheel 3 and the spindle 4 are both It is a hollow structure, and the interiors of the two are interconnected; on the polishing wheel 3, between the two adjacent wedge-shaped structures 31, a wheel air vent 301 is provided (the gas delivered by the air pump 7 will be ejected from the wheel air vent 301 to give the polishing liquid a gas pressure); on the main shaft 4, an axis air vent 401 is provided; the axis air vent 401 is connected to the air pump 7 through the air pipe 71; the lifting mechanism 5 is connected to the polishing wheel 3, and is used to drive the polishing wheel 3 to move up and down, so that a polishing gap is formed between the polishing wheel 3 and the polishing groove 2; the polishing groove 2 is provided with a clamp 21 for clamping the workpiece and a blade stirring wheel 22 for stirring the polishing liquid.

[0029] Example:

[0030] See also Figure 3 and Figure 4 In this embodiment, the main shaft 4 is provided with a sealing sleeve 8 on its outer sleeve, and the main shaft 4 can rotate relative to the sealing sleeve 8; a cavity 801 is formed between the sealing sleeve 8 and the main shaft 4; a sleeve through hole 802 is provided on the sealing sleeve 8, and the end of the air pipe 71 is connected to the sleeve through hole 802. Therefore, during polishing, the main shaft 4 rotates while the air pipe 71 does not need to rotate synchronously, and the implementation difficulty is relatively low. The polishing wheel 3, the main shaft 4, the sealing sleeve 8 and the servo motor 6 constitute a polishing ventilation mechanism.

[0031] Furthermore, flanges 81 are provided at both ends of the interior of the sealing sleeve 8; rolling bearings 9 are provided on the inner side of the flange 81, and the main shaft 4 is inserted into the rolling bearings 9; a sealing ring 10 is provided on the outer side of the flange 81, and the sealing ring 10 is sleeved on the main shaft 4. The provision of the rolling bearings 9 can reduce the friction coefficient during the rotation of the main shaft 4 and ensure its rotation accuracy; the provision of the sealing ring 10 can seal the connection between the sealing sleeve 8 and the main shaft 4 to prevent the gas in the sealing sleeve 8 from leaking through the connection gap. In addition, the provision of the flange 81 inside the sealing sleeve 8 can play a positioning role when installing the rolling bearings 9, and can also assist the sealing ring 10 to better seal the sealing sleeve 8. The sealing sleeve 8 is a rectangular structure, and sealing cover plates 82 are fixed at both ends.

[0032] Furthermore, the polishing wheel 3 includes a wheel body 32; the wheel body 32 has a cavity therein and is open at one end, and a wheel cover 33 is provided at the opening for sealing the polishing wheel body 32; the spindle 4 passes through the other end of the wheel body 32 and is fixed to the wheel body 32 by a threaded connection; 8 wedge-shaped structures 31 are evenly spaced along the axial direction on the outer peripheral surface of the wheel body 31, and 3 wheel air vents 301 are spaced between two adjacent wedge-shaped structures 31 (that is, a total of 24 wheel air vents 301 are provided on the polishing wheel 3; at this time, the gas pressure can be evenly distributed in the axial direction of the workpiece to achieve a uniform and consistent polishing effect); wherein, the wheel cover 33 is circular and has a diameter smaller than that of the wheel body 32, thereby ensuring that during the polishing operation, the wheel cover 33 does not contact the polishing liquid, and only the wedge-shaped structures 31 on the circumferential surface of the wheel body 32 contact the polishing liquid.

[0033] In this embodiment, the base 1 is also provided with a polishing liquid circulation device 11, and the polishing liquid circulation device 11 includes a polishing liquid box and a flow pump; the polishing liquid circulation device 11 is connected to the polishing tank 2 through a liquid delivery pipe 12 to form a closed loop circuit. Thus, the polishing liquid can be recycled and the cost can be reduced. Furthermore, the base 1 is also provided with a dripping device 13 for adding water to the polishing tank 2. After the polishing liquid is used for a long time, the water will evaporate and solid precipitates will remain; after adding water to these solid precipitates, new polishing liquid can be generated and put into use again, so that the polishing liquid can be recycled for a long time and with high quality.

[0034] In this embodiment, the base 1 is provided with an X-axis screw slide 14 and a Y-axis screw slide 15 for adjusting the position of the polishing wheel 3; the X-axis screw slide 14 is fixed on the base 1, and the Y-axis screw slide 15 is slidably connected with the X-axis screw slide 14 through a gantry 16 (the Y-axis screw slide 15 is fixed to the top of the crossbeam of the gantry 16, and the bottom of the gantry 16 is slidably connected with the X-axis screw slide 14); the lifting mechanism 5 is slidably connected with the Y-axis screw slide 15. At this time, the movement of the polishing wheel in the front and back and left and right directions can be controlled by the X- and Y-axis screw slides to adjust the position of the polishing wheel 3, so that it can adapt to different models of workpieces to be processed, and has good versatility; and the use of the screw slide to change the position of the polishing wheel 3 has high adjustment accuracy.

[0035] See also Figure 6 In this embodiment, the lifting mechanism 5 is a screw slide, and an L-shaped connecting plate 17 is provided on the slide of the lifting mechanism 5; the sealing sleeve 8 and the servo motor 6 are fixed on the L-shaped connecting plate 17. At this time, the assembly is convenient and easy to implement.

[0036] Furthermore, the lifting mechanism 5 is slidably connected to the Y-axis screw slide 15 via a square-shaped connecting plate 19 , and the square-shaped connecting plate 19 is sleeved on the crossbeam of the gantry 16 .

[0037] In this embodiment, an arc-shaped protective cover 18 is provided above the polishing wheel 3 to prevent the polishing liquid from splashing during the polishing process and polluting the surrounding environment. The arc-shaped protective cover 18 is connected to the sealing sleeve 8 through an L-shaped connecting rod.

[0038] In this embodiment, the polishing tank 2 is hexagonal. As a result, the flow field distribution of the polishing liquid in the polishing tank 2 can be better improved, thereby improving the cutting force of the polishing liquid on the complex curved surface of the workpiece, and achieving a uniform and consistent polishing effect. A base 23 is provided at the bottom of the polishing tank 2, and the base 23 is fixed on the base 1.

[0039] See also Figure 7 and Figure 8 , an airflow-assisted shear rheological polishing method using a wedge-shaped polishing wheel, the method is implemented using the airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel in the present embodiment described above; specifically comprising the following steps:

[0040] S1, the workpiece 20 to be processed is mounted on the fixture 21 of the polishing tank 2, and the lifting mechanism 5 is started to adjust the position of the polishing wheel 3 so that the gap between the bottom of the polishing wheel 3 and the polishing tank 2 is 1 to 3 mm.

[0041] S2, add non-Newtonian fluid polishing liquid into the polishing liquid tank 2, so that the polishing liquid immerses the wedge-shaped structure 31 at the bottom of the polishing wheel 3; the non-Newtonian fluid polishing liquid includes abrasive particles, solid phase particles, additives and deionized water; the abrasive particles are a mixture of one or more of silicon dioxide, aluminum oxide, cerium oxide, and diamond, with a concentration of 2wt.%-20wt.%.

[0042] S3, start the blade stirring wheel 22 to stir the polishing liquid, and start the servo motor 6 to drive the polishing wheel 3 to rotate, the speed of the polishing wheel 3 is 70-80rpm, so that the polishing wheel 3 and the polishing liquid form a relative motion; at a certain shear rate, the polishing liquid undergoes shear thickening, and the solid phase particles therein entrain the abrasive particles to form a "particle cluster", which is squeezed toward the surface of the workpiece 20 by the fluid dynamic pressure generated by the polishing liquid and the wedge pressure generated by the wedge structure 31 of the polishing wheel, so that a cutting action occurs, thereby achieving a surface of the workpiece 20. At the same time, the air pump 7 is started to output air flow, and the air flow 26 enters the cavity 802 from the sleeve through hole 802 on the sealing sleeve 8 through the air pipe 71, flows through the inside of the main shaft 4 and the polishing wheel 3, and finally ejects from the wheel vent 301 on the polishing wheel 3, applying a gas pressure to the "particle clusters" in the polishing liquid in the working area, and blowing towards the grooves and slits on the surface of the workpiece, blowing away the solid phase particles 24 and the abrasive particles 25 deposited in the cavities, so that the solid phase particles 24 and the abrasive particles 25 are recombined, thereby improving the polishing efficiency.

[0043] Implementation Cases:

[0044] This case is to polish the BK7 glass sheet using the above-mentioned airflow assisted shear rheological polishing method using a wedge-shaped polishing wheel. The specific experimental conditions are listed in the following table:

[0045] Workpiece BK7 glass Abrasive Type <![CDATA[CeO2]]> Abrasive Concentration 15wt.% Polishing wheel speed 75rpm Distance between workpiece and polishing wheel 1mm Polishing time 30min

[0046] Experiments show that during the processing, the performance of the polishing liquid remains almost stable. After polishing, all surface scratches on the glass sheet are removed, and the glass sheet becomes transparent and shiny. The roughness Sa is reduced from the original 230.1nm±15nm to below 0.8nm±0.1nm.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel, characterized in that: The invention comprises a base (1); the base (1) is provided with a polishing groove (2), a polishing wheel (3), a spindle (4) and a lifting mechanism (5); the polishing groove (2) is used to contain polishing liquid; the polishing wheel (3) is located above the polishing groove (2), and a group of wedge-shaped structures (31) are provided on the outer surface of the polishing wheel (3) at intervals along the axial direction; one end of the spindle (4) is connected to the polishing wheel (3), and the other end is connected to a servo motor (6); the polishing wheel (3) and the spindle (4) are both hollow structures, and the interiors of the two are connected to each other; the polishing wheel (3) (3), located between two adjacent wedge-shaped structures (31), with a wheel vent (301); the main shaft (4) is provided with an axis vent (401); the axis vent (401) is connected to the air pump (7) through an air pipe (71); the lifting mechanism (5) is connected to the polishing wheel (3), and is used to drive the polishing wheel (3) to move up and down, so that a polishing gap is formed between the polishing wheel (3) and the polishing groove (2); the polishing groove (2) is provided with a clamp (21) for clamping a workpiece and a blade stirring wheel (22) for stirring the polishing liquid.

2. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 1, characterized in that: The main shaft (4) is provided with a sealing sleeve (8) on its outer sleeve, and the main shaft (4) can rotate relative to the sealing sleeve (8); a cavity (801) is formed between the sealing sleeve (8) and the main shaft (4); a sleeve through hole (802) is provided on the sealing sleeve (8), and an end of the air pipe (71) is connected to the sleeve through hole (802).

3. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 2, characterized in that: Flanges (81) are provided at both ends of the interior of the sealing sleeve (8); a rolling bearing (9) is provided on the inner side of the flange (81), and the main shaft (4) is inserted into the rolling bearing (9); a sealing ring (10) is provided on the outer side of the flange (81), and the sealing ring (10) is sleeved on the main shaft (4).

4. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 2, characterized in that: The base (1) is also provided with a polishing liquid circulation device (11); the polishing liquid circulation device (11) and the polishing tank (2) are connected to form a closed loop circuit via a liquid delivery pipeline (12).

5. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 4, characterized in that: The base (1) is also provided with a water dripping device (13) for adding water into the polishing tank (2).

6. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 2, characterized in that: The base (1) is provided with an X-axis screw slide (14) and a Y-axis screw slide (15) for adjusting the position of the polishing wheel (3); the X-axis screw slide (14) is fixed on the base (1), and the Y-axis screw slide (15) is slidably connected to the X-axis screw slide (14) via a gantry (16); and the lifting mechanism (5) is slidably connected to the Y-axis screw slide (15).

7. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 6, characterized in that: The lifting mechanism (5) is provided with an L-shaped connecting plate (17), and the sealing sleeve (8) and the servo motor (6) are fixed on the L-shaped connecting plate (17).

8. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 7, characterized in that: An arc-shaped protective cover (18) is provided above the polishing wheel (3).

9. The airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel according to claim 1, characterized in that: The polishing groove (2) is hexagonal.

10. An airflow-assisted shear rheological polishing method using a wedge-shaped polishing wheel, characterized in that: The method is implemented by using the airflow-assisted shear rheological polishing device using a wedge-shaped polishing wheel as described in claim 1; specifically comprising the following steps: S1, the workpiece to be processed is mounted on the fixture (21) of the polishing tank (2), and the lifting mechanism (5) is started to adjust the position of the polishing wheel (3) so that the gap between the bottom of the polishing wheel and the polishing tank (2) is 1 to 3 mm; S2, adding a non-Newtonian fluid polishing liquid into the polishing liquid tank (2) so that the polishing liquid submerges the wedge-shaped structure (31) at the bottom of the polishing wheel (3); S3, starting the blade stirring wheel (22) to stir the polishing liquid, and starting the servo motor (6) to drive the polishing wheel (3) to rotate, so that the polishing wheel (3) and the polishing liquid form a relative motion, the polishing liquid undergoes a shear thickening phenomenon, and the surface of the workpiece is polished; at the same time, starting the air pump (7) to output an air flow, the air flow is input into the main shaft (4) through the air pipe (71), and is ejected from the wheel vent (301) on the polishing wheel (3).

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