Double-plane grinding machining device and method based on grinding disc electrolytic shape control sharpening

Abstract

The invention discloses a double-plane grinding machining device and method based on grinding disc electrolytic shape control sharpening. The double-plane grinding machining device comprises a workbench. A double-plane grinding machining module and a grinding disc electrolysis shape control sharpening module are arranged on the workbench. The double-plane grinding machining module comprises an upper grinding disc, a lower grinding disc, a holder, an upper grinding disc motor, an upper grinding disc pressurizing assembly, a bevel gear, a bevel gear driving assembly, a lower grinding disc motor, a floating clamp and a grinding liquid nozzle. The grinding disc electrolytic shape control dressing module comprises a tool electrode, an electrode adjusting assembly and a power source. When the double-plane grinding machining device based on grinding disc electrolytic shape control dressing is adopted to grind a cylindrical roller, the lower grinding disc can be synchronously ground in the process that the cylindrical roller is ground by the grinding disc, so that the surface of the lower grinding disc is always provided with sharp abrasive particles and a high-precision shape surface, and the machining efficiency and precision are improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-precision machining, and in particular to a double-plane grinding device and method based on electrolytic shape-controlled sharpening of a grinding disc. Background Art

[0002] Bearings play a vital role in mechanical equipment. They not only support rotating bodies, reduce friction and wear, and improve operating accuracy and stability, but also carry and transmit loads, reduce noise and vibration, and provide sealing and protection functions. Precision cylindrical rollers are key parts in bearings, which can not only improve the bearing's load capacity and stability, but also optimize the bearing's rolling contact performance and improve operating accuracy.

[0003] With the continuous advancement of science and technology and the increasing complexity of industrial applications, the performance and quality requirements of bearings are becoming higher and higher. This also puts forward new requirements for the accuracy of precision cylinders. The cylindrical surface of the cylinder is ground and polished using a double-plane grinding device. The material on the machined surface is removed through the relative movement of the upper and lower grinding discs and the workpiece under a certain pressure, which can improve the surface accuracy of the cylindrical roller. However, the existing double-plane grinding devices still have the problem of insufficient grinding accuracy. During the grinding process, while the grinding disc removes the surface material of the workpiece, the abrasive particles on the surface are also flattened, resulting in reduced grinding efficiency and grinding accuracy. In addition, the traditional double-plane grinding processing device needs to repair the grinding disc before processing. The whole process is time-consuming and labor-intensive, and the efficiency is low. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a double-plane grinding processing device and method based on electrolytic shape-controlled sharpening of the grinding disc; the double-plane grinding processing device based on electrolytic shape-controlled sharpening of the grinding disc of the present invention is used to grind the cylindrical roller, and the lower grinding disc can be simultaneously sharpened while the grinding disc is grinding the workpiece, so that the surface of the lower grinding disc always has sharp abrasive particles and a high-precision surface, thereby improving the efficiency and accuracy of the processing. In addition, the present invention also provides a double-plane grinding method implemented by the double-plane grinding processing device of the present invention, and grinding cylindrical rollers by this method can improve the efficiency and accuracy of grinding.

[0005] For the processing device, the technical solution of the present invention is as follows:

[0006] The double-plane grinding processing device based on the electrolytic shape-controlled sharpening of the grinding disc comprises a workbench; the workbench is provided with a double-plane grinding processing module and a grinding disc electrolytic shape-controlled sharpening module; the double-plane grinding processing module comprises an upper grinding disc, a lower grinding disc, a retaining frame, an upper grinding disc motor, an upper grinding disc pressurizing assembly, a bevel gear, a bevel gear driving assembly, a lower grinding disc motor, a floating fixture, and a grinding liquid nozzle; the upper grinding disc is a flat disc without abrasive grains, and the lower grinding disc is a metal-bonded abrasive grain disc; the upper grinding disc pressurizing assembly is arranged on the table surface of the workbench, and the upper grinding disc motor is arranged on the upper grinding disc pressurizing assembly. The output end of the upper grinding disc motor is connected to the upper grinding disc through a floating clamp, and can drive the upper grinding disc to rotate. The upper grinding disc is eccentrically arranged relative to the lower grinding disc; the upper grinding disc pressure component can drive the upper grinding disc to descend to contact with the workpiece and apply a set pressure; the lower grinding disc motor is fixed to the lower side of the table surface of the workbench, and the lower grinding disc is arranged on the upper side of the table surface of the workbench. The rotating shaft of the lower grinding disc motor is connected to the lower grinding disc, and can drive the lower grinding disc to rotate; the retaining frame includes a disc-shaped main body, and the disc-shaped main body is provided with workpiece limiting grooves in groups, and the center thereof A positioning hole is provided, and the positioning hole can cooperate with the positioning shaft head corresponding to the center of the upper grinding disc after the upper grinding disc is pressed down, so as to radially limit the retaining frame; the edge of the disc-shaped body is provided with transmission teeth distributed upward, and the disc-shaped body is in a plane shape, so that it can be placed on the lower grinding disc to form a plane match with the lower grinding disc; the bevel gear drive assembly is arranged on the workbench, and the bevel gear is arranged on the bevel gear drive assembly, and the bevel gear can mesh with the transmission teeth on the retaining frame; the bevel gear drive assembly can control the bevel gear to descend to the position corresponding to the retaining gear placed on the lower grinding disc The transmission teeth of the holder are meshed and can drive the bevel gear to rotate; the grinding fluid nozzle is fixed on the workbench and can spray the electrolytic grinding fluid onto the surface of the lower grinding disc; the grinding disc electrolytic shape control and sharpening module includes a tool electrode, an electrode adjustment component, and a power supply; the electrode adjustment component is arranged on the workbench, and the tool electrode is arranged above the lower grinding disc through the electrode adjustment component, and the electrode adjustment component can measure and electrically adjust the gap between the tool electrode and the lower grinding disc; the tool electrode is electrically connected to the negative pole of the power supply, and the lower grinding disc is electrically connected to the positive pole of the power supply.

[0007] Compared with the prior art, in the double-plane grinding processing device based on the electrolytic shape-controlled sharpening of the grinding disc of the present invention, a specific electrolytic shape-controlled sharpening module for the grinding disc is provided, and there is no need to sharpen the grinding disc before processing. The electrolytic shape-controlled sharpening module for the grinding disc can electrolyze the lower grinding disc during the processing to generate an oxide film on the surface of the lower grinding disc, and the oxide film will be removed under the action of friction, so that the surface of the lower grinding disc always has sharp abrasive grains. At the same time, during the electrolytic grinding process, the closer the distance between the rough raised part on the lower grinding disc and the tool electrode is, the thicker the oxide film generated will be. The oxide film will be removed under the action of friction, effectively improving the accuracy of the shape of the lower grinding disc and maintaining a high-precision shape, thereby improving the grinding efficiency and the accuracy of the surface of the cylindrical roller after processing. In addition, in order to adapt to the grinding disc electrolytic shaping and sharpening module, the present invention sets the upper grinding disc to be eccentric relative to the lower grinding disc, and designs a special retaining frame and its driving device. When working, the upper grinding disc presses down to pressurize the cylindrical roller. At the same time, the positioning shaft head of the upper grinding disc cooperates with the positioning hole of the retaining frame to limit the retaining frame, and the retaining frame rotates under the drive of the bevel gear. The upper and lower grinding discs rotate under the drive of the motor, so that the cylindrical roller makes a compound motion, and the surface material is removed under the action of friction. Therefore, under the coordinated action of the specific double-plane grinding processing module and the grinding disc electrolytic shaping and sharpening module, the cylindrical surface of the cylindrical roller is efficiently and high-precision ground.

[0008] Furthermore, in the aforementioned double-plane grinding processing device based on electrolytic grinding disc shape control and sharpening, the upper grinding disc pressure component includes a mounting frame, the mounting frame is arranged on a workbench, a servo screw slide is arranged on the mounting frame, and the servo screw slide is connected to the upper grinding disc motor and can drive the upper grinding disc motor to move vertically. The upper grinding disc pressure component adopts the above structural design, which is easy to implement and has high reliability; the vertical movement of the upper grinding disc is controlled by the servo screw slide, and the position of the upper grinding disc and the loaded pressure can be controlled more accurately.

[0009] Furthermore, in the aforementioned double-plane grinding processing device based on electrolytic grinding disc shape control and sharpening, a polishing liquid collection tank is provided on the table surface of the workbench, and the lower grinding disc is arranged in the polishing liquid collection tank. The electrolytic grinding liquid can be recovered in the polishing liquid collection tank and then reused after treatment, which can reduce the waste of electrolytic grinding liquid and reduce processing costs.

[0010] Furthermore, in the aforementioned double-plane grinding processing device based on electrolytic grinding disc shape control and sharpening, the workpiece limiting grooves are evenly distributed along the circumference around the positioning hole on the retaining frame. In this case, the consistency of batch processing is better.

[0011] Furthermore, in the aforementioned double-plane grinding processing device based on electrolytic grinding disc shape control and sharpening, the bevel gear drive assembly includes a bevel gear lifting slide, the bevel gear lifting slide is arranged on the workbench, and a bevel gear motor is arranged on the bevel gear lifting slide, and the output shaft of the bevel gear motor is connected to the bevel gear, which can drive the bevel gear to rotate. The bevel gear drive assembly adopts this structural design, which is easy to implement and has high reliability.

[0012] Furthermore, in the aforementioned double-plane grinding processing device based on electrolytic shape-controlled sharpening of the grinding disc, in order to facilitate implementation and operation, the electrode adjustment component includes a servo fine-tuning slide; the servo fine-tuning slide is arranged on a workbench, and a flat-nose pliers is arranged on the servo fine-tuning slide; the tool electrode is clamped and fixed by the flat-nose pliers, and the distance between the tool electrode and the lower grinding disc can be adjusted by the servo fine-tuning slide. Further, the electrode adjustment component also includes a distance sensor, and the distance sensor can measure the gap between the tool electrode and the lower grinding disc. Using a distance sensor to measure the gap between the tool electrode and the lower grinding disc also has the advantage of being easy to implement.

[0013] Furthermore, in the aforementioned double-plane grinding processing device based on electrolytic grinding disc shape control and sharpening, a carbon brush is provided on the side of the lower grinding disc, and the positive electrode of the power supply is electrically connected to the carbon brush. The lower grinding disc is in a rotating state when working, so the positive electrode of the power supply needs to be electrically connected to the lower grinding disc through an electric slip ring or a carbon brush. In contrast, the use of a carbon brush does not require changing the setting of the lower grinding disc, and is easier to implement.

[0014] For the processing method, the technical solution of the present invention is as follows:

[0015] The double-plane grinding method based on the electrolytic shape-control and sharpening of the grinding disc, which utilizes the above-mentioned double-plane grinding device based on the electrolytic shape-control and sharpening of the grinding disc to grind the cylindrical roller, comprises the following steps:

[0016] S1: Place the retainer on the lower grinding disc in an eccentric manner so that its positioning hole is opposite to the positioning shaft head of the upper grinding disc; place the cylindrical roller in the workpiece limit groove, and use the electrode adjustment assembly to adjust the gap between the tool electrode and the lower grinding disc to the initial setting value;

[0017] S2: The upper grinding disc pressure assembly drives the upper grinding disc to press down, so that the positioning shaft head and the positioning hole cooperate with each other, and apply a set pressure to the cylindrical roller; the bevel gear driving assembly drives the bevel gear to descend, so that it meshes with the transmission teeth on the edge of the cage;

[0018] S3: Start processing; the upper grinding disc, the lower grinding disc and the retaining frame rotate at a set speed; the grinding fluid nozzle continuously sprays electrolytic grinding fluid to the lower grinding disc; under the action of electrolysis, an anodic oxidation reaction occurs on the surface of the lower grinding disc to form an oxide film that is easy to remove. As grinding proceeds, the oxide film is removed under the action of friction, and the passivated abrasive particles fall off, exposing new abrasive particles inside, so that the surface of the lower grinding disc always has sharp abrasive particles; during the grinding process, when the electrode adjustment component measures that the gap between the tool electrode and the lower grinding disc exceeds the set deviation range, the controller actively adjusts the gap between the tool electrode and the lower grinding disc to the initial set value;

[0019] S4: After the processing reaches the set time, the power is turned off, and the upper grinding disc motor, the lower grinding disc motor and the bevel gear stop rotating; then, the upper grinding disc and the bevel gear rise and reset, and the processed cylindrical roller can be taken out.

[0020] Compared with the prior art, the double-plane grinding method of the present invention adopts the above-mentioned double-plane grinding device based on electrolytic shaping and sharpening of the grinding disc to grind the cylindrical roller. During processing, the electrolytic shaping and sharpening module performs online shaping and sharpening on the lower grinding disc, so that the lower grinding disc maintains a high-precision surface contour and always has sharp abrasive particles, which can realize efficient and high-precision grinding of the cylindrical roller. During the grinding process, when the electrode adjustment component measures that the gap between the tool electrode and the lower grinding disc exceeds the set deviation range, the controller actively adjusts the gap between the tool electrode and the lower grinding disc to the initial set value, effectively improving the effect of online shaping and sharpening. In addition, the method of the present invention has simple steps and is easy to implement industrially.

[0021] Furthermore, in the aforementioned double-plane grinding method based on electrolytic shape-controlled sharpening of the grinding disc, the initial setting value can be 0.2-1 mm.

[0022] Furthermore, in the aforementioned double-plane grinding method based on electrolytic shape-controlled sharpening of the grinding disc, the power supply is a DC pulse power supply. If there is always voltage between the electrodes, the generated oxide film is loose and easy to fall off, and the grinding disc wears faster. The use of a DC pulse power supply can periodically electrolyze the lower grinding disc to avoid excessive wear of the lower grinding disc. Further, the output voltage of the power supply is 10-110V, the on time of the output pulse of the power supply is 2-200 microseconds, and the off time of the output pulse is 2-200 microseconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a double-plane grinding processing device based on electrolytic shape-controlled sharpening of a grinding disc according to the present invention;

[0024] Figure 2 It is a structural schematic diagram of the processing state of the double-plane grinding processing device based on the electrolytic shape-controlled sharpening of the grinding disc of the present invention;

[0025] Figure 3 It is a schematic structural diagram of a retainer in a double-plane grinding processing device based on electrolytic shape-controlled sharpening of a grinding disc according to the present invention;

[0026] Figure 4 It is a structural schematic diagram of a bevel gear drive assembly and a cage drive device composed of bevel gears in a double-plane grinding processing device based on electrolytic profile control and sharpening of a grinding disc according to the present invention;

[0027] Figure 5 It is a structural schematic diagram of an electrode adjustment assembly in a double-plane grinding processing device based on electrolytic shape-controlled sharpening of a grinding disc according to the present invention;

[0028] Figure 6 It is a structural schematic diagram of the upper grinding disc in the double-plane grinding processing device based on the electrolytic shape-controlled sharpening of the grinding disc of the present invention (looking up);

[0029] Figure 7 This is a test diagram of the roundness of a cylindrical roller before processing measured by a roundness measuring instrument in an embodiment;

[0030] Figure 8 is a roundness test diagram of a cylindrical roller after processing measured by a roundness measuring instrument in an embodiment;

[0031] Fig. 9 This is a roughness diagram of a cylindrical roller before processing measured by a roughness meter in an embodiment;

[0032] Fig.10 The roughness diagram of the cylindrical roller after machining is measured by a roughness meter in the embodiment;

[0033] Fig.11 The present invention is a diagram of the electrolytic shape-control and sharpening mechanism of the lower grinding disc in the double-plane grinding processing device based on the electrolytic shape-control and sharpening of the grinding disc.

[0034] Figure markings: 1-workbench; 2-upper grinding disc; 201-positioning shaft head; 3-lower grinding disc; 4-retaining frame; 401-workpiece limiting groove; 402-positioning hole; 403-transmission gear; 5-upper grinding disc motor; 6-upper grinding disc pressure assembly; 601-mounting frame; 602-servo screw slide; 7-bevel gear; 8-bevel gear driving assembly; 801-bevel gear lifting slide; 802-bevel gear motor; 9-lower grinding disc motor; 10-floating fixture; 11-grinding liquid nozzle; 12-tool electrode; 13-electrode adjustment assembly; 1301-servo fine-tuning slide; 1302-flat-nose pliers; 1303-distance sensor; 14-power supply; 15-carbon brush: 16-polishing liquid collection tank; 17-oxide film. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to serve as the basis of the present invention.

[0036] Example (see Figure 1-11 ):

[0037] In this embodiment, the double-plane grinding processing device based on the electrolytic shape-control and sharpening of the grinding disc of the present invention comprises a workbench 1; the workbench 1 is provided with a double-plane grinding processing module and a grinding disc electrolytic shape-control and sharpening module. The double-plane grinding processing module and the grinding disc electrolytic shape-control and sharpening module work together to achieve efficient and high-precision grinding processing of the cylindrical surface of the cylindrical roller.

[0038] In this embodiment, the double-plane grinding processing module includes an upper grinding disc 2, a lower grinding disc 3, a retaining frame 4, an upper grinding disc motor 5, an upper grinding disc pressure assembly 6, a bevel gear 7, a bevel gear drive assembly 8, a lower grinding disc motor 9, a floating fixture 10, and a grinding liquid nozzle 11; the upper grinding disc 2 is a flat disc without abrasive particles, and the lower grinding disc 3 is a metal bond abrasive particle disc; the upper grinding disc pressure assembly 6 is arranged on the table surface of the workbench 1, the upper grinding disc motor 5 is arranged on the upper grinding disc pressure assembly 6, and the upper grinding disc motor The output end of 5 is connected to the upper grinding disc 2 through a floating fixture 10, and can drive the upper grinding disc 2 to rotate. The upper grinding disc 2 is eccentrically arranged relative to the lower grinding disc 3; the upper grinding disc pressure component 6 can drive the upper grinding disc 2 to descend to contact with the workpiece and apply a set pressure; the lower grinding disc motor 9 is fixed to the lower side of the table surface of the workbench 1, and the lower grinding disc 3 is arranged on the upper side of the table surface of the workbench 1. The rotating shaft of the lower grinding disc motor 9 is connected to the lower grinding disc 3, and can drive the lower grinding disc 3 to rotate; the retaining frame 4 includes a circular The disc-shaped body is provided with workpiece limiting grooves 401 in groups, and a positioning hole 402 is provided in the center thereof. The positioning hole 402 can cooperate with the positioning shaft head 201 correspondingly arranged in the center of the upper grinding disc 2 after the upper grinding disc 2 is pressed down to radially limit the retainer 4; the edge of the disc-shaped body is provided with transmission teeth 403 distributed upward, and the disc-shaped body is flat so that it can be placed on the lower grinding disc 3 to form a plane match with the lower grinding disc 3; the bevel gear drive assembly 8 is arranged at the working On the table 1, the bevel gear 7 is arranged on the bevel gear driving assembly 8 (the bevel gear 7 and the bevel gear driving assembly 8 constitute a cage driving device), and the bevel gear 7 can mesh with the transmission teeth 403 on the cage 4; the bevel gear driving assembly 8 can control the bevel gear 7 to descend to mesh with the transmission teeth 403 of the cage 4 correspondingly placed on the lower grinding disc 3, and can drive the bevel gear 7 to rotate; the grinding liquid nozzle 11 is fixed on the workbench 1, and can spray the electrolytic grinding liquid onto the surface of the lower grinding disc 3. The above setting provides the necessary conditions for the setting of the grinding disc electrolytic shape control and sharpening module.

[0039] In this embodiment, the grinding disc electrolytic shape control and sharpening module includes a tool electrode 12, an electrode adjustment component 13, and a power supply 14; the electrode adjustment component 13 is arranged on a workbench, and the tool electrode 12 is arranged above the lower grinding disc 3 through the electrode adjustment component 13, and the electrode adjustment component 13 can measure and electrically adjust the gap between the tool electrode 12 and the lower grinding disc 3; the tool electrode 12 is electrically connected to the negative pole of the power supply 14, and the lower grinding disc 3 is electrically connected to the positive pole of the power supply 14.

[0040] In this embodiment, the upper grinding disc pressurizing assembly 6 includes a mounting frame 601, the mounting frame 601 is arranged on the workbench 1, and a servo screw slide 602 is arranged on the mounting frame 601, and the servo screw slide 602 is connected to the upper grinding disc motor 5, and can drive the upper grinding disc motor 5 to move vertically. The upper grinding disc pressurizing assembly 6 adopts the above structural design, which is easy to implement and has high reliability; the vertical movement of the upper grinding disc 2 is controlled by the servo screw slide 602, and the position of the upper grinding disc 2 and the pressure loaded can be controlled more accurately.

[0041] In this embodiment, a polishing liquid collecting tank 16 is provided on the table surface of the workbench 1, and the lower grinding disc 3 is arranged in the polishing liquid collecting tank 16. The polishing liquid collecting tank 16 can recycle the electrolytic grinding liquid, and then reuse it after treatment, which can reduce the waste of electrolytic grinding liquid and reduce processing costs.

[0042] In this embodiment, the workpiece limiting grooves 401 are evenly distributed along the circumference around the positioning hole 402 on the retaining frame 4. In this case, the consistency of batch processing is better.

[0043] In this embodiment, the bevel gear drive assembly 8 includes a bevel gear lifting slide 801, which is arranged on the workbench 1. A bevel gear motor 802 is arranged on the bevel gear lifting slide 801. The output shaft of the bevel gear motor 802 is connected to the bevel gear 7 and can drive the bevel gear 7 to rotate. The bevel gear drive assembly 8 adopts this structural design, which is easy to implement and has high reliability.

[0044] In this embodiment, the electrode adjustment assembly 13 includes a servo fine-tuning slide 1301; the servo fine-tuning slide 1301 is arranged on the workbench 1, and a flat-nose pliers 1302 is provided on the servo fine-tuning slide 1301; the tool electrode 12 is clamped and fixed by the flat-nose pliers 1302, and the distance between the tool electrode 12 and the lower grinding disc 3 can be adjusted through the servo fine-tuning slide 1301.

[0045] In this embodiment, the electrode adjustment assembly 13 further includes a distance sensor 1303, and the distance sensor 1303 can measure the gap between the tool electrode 12 and the lower grinding disc 3. Using the distance sensor 1303 to measure the gap between the tool electrode 12 and the lower grinding disc 3 also has the advantage of being easy to implement.

[0046] In this embodiment, a carbon brush 15 is provided on the side of the lower grinding disc 3, and the positive electrode of the power supply 14 is electrically connected to the carbon brush 15. The lower grinding disc 3 is in a rotating state when working, so the positive electrode of the power supply 14 needs to be electrically connected to the lower grinding disc through an electric slip ring or a carbon brush 15. In contrast, the use of the carbon brush 15 does not require changing the setting of the lower grinding disc 3, and is easier to implement.

[0047] In this embodiment, the power supply 14 is a DC pulse power supply. If there is always voltage between the electrodes, the generated oxide film 17 is loose and easy to fall off, and the grinding disc wears faster. The DC pulse power supply can periodically electrolyze the lower grinding disc 3 to avoid excessive wear of the lower grinding disc 3.

[0048] In this embodiment, the grinding method for the cylindrical roller includes the following steps:

[0049] S1: The retainer 4 is placed eccentrically on the lower grinding disc 3. The eccentric setting of the upper retainer 4 allows the other part of the lower grinding disc 3 to be used for electrolytic sharpening. During the processing, the sharpening of the lower grinding disc 3 and the grinding of the cylindrical roller can be achieved simultaneously, so that the positioning hole 402 is opposite to the positioning shaft head 201 of the upper grinding disc 2; the cylindrical roller is placed in the workpiece limiting groove 401, and the gap between the tool electrode 12 and the lower grinding disc 3 is adjusted to 0.8 mm by using the electrode adjustment assembly 13;

[0050] S2: The upper grinding disc pressure component 6 drives the upper grinding disc 2 to press down, so that the positioning shaft head 201 and the positioning hole 402 cooperate with each other, and apply a set pressure to the cylindrical roller; the bevel gear driving component 8 drives the bevel gear 7 to descend, so that it meshes with the transmission tooth 403 on the edge of the retainer 4;

[0051] S3: start processing; the upper grinding disc 2, the lower grinding disc 3, and the retaining frame 4 rotate at a set speed; the grinding fluid nozzle 11 continuously sprays electrolytic grinding fluid to the lower grinding disc 3;

[0052] Under the action of electrolysis, an anodic oxidation reaction occurs on the surface of the lower grinding disc 3, generating an oxide film 17 that is easy to remove. As grinding proceeds, the oxide film 17 is removed under the action of friction, and the passivated abrasive particles fall off, exposing new abrasive particles inside, so that the surface of the lower grinding disc 3 always has sharp abrasive particles. During the grinding process, when the electrode adjustment component 13 measures that the gap between the tool electrode 12 and the lower grinding disc 3 exceeds 0.05 mm, the controller actively adjusts the gap between the tool electrode 12 and the lower grinding disc 3 to the initial setting value (0.8 mm).

[0053] S4: After the processing reaches the set time, the power supply 14 is turned off, and the upper grinding disc motor 5, the lower grinding disc motor 9, and the bevel gear 7 stop rotating; then, the upper grinding disc 2 and the bevel gear 7 rise and reset, and the processed cylindrical roller can be taken out.

[0054] like Fig.11 As shown, the initial microstructure of the lower grinding disc 3 is as follows Fig.11 As shown in a, the small circles in the lower grinding disc 3 are abrasive particles; Fig.11 In b, a tool electrode 12 with high plane precision is installed at a certain gap above the lower grinding disc 3, the tool electrode 12 is connected to the cathode of the power supply 14, the lower grinding disc 3 is connected to the anode of the power supply 14, and the electrolyte fills the electrolytic gap between the tool electrode 12 and the working surface of the lower grinding disc 3. The density of the thin vertical lines in the figure represents the density of the current passing between the tool electrode 12 and the lower grinding disc 3; during operation, the closer the electrolytic gap is, the greater the current density passing through, and the faster the electrolysis speed on the surface of the lower grinding disc 3 is; as shown in FIG. Fig.11 As shown in c, the strength of the electrolysis is selective, the electrolysis gap is inconsistent, and the thickness of the oxide film 17 formed is inconsistent; Fig.11 As shown in FIG. d , the oxide film 17 is removed under the action of friction, so that the surface of the lower grinding disc 3 obtains and maintains a high shape accuracy, thereby achieving shape control of the lower grinding disc 3 ; at the same time, the removal of the oxide film 17 exposes new abrasive grains, so that the lower grinding disc 3 remains sharp.

[0055] In the specific implementation, a batch of silicon nitride cylindrical rollers (Φ10×18) were processed using the above-mentioned double-plane grinding method. In the experiment, a metal bond grinding disc with a diamond abrasive particle size of 45 μm was used as the lower grinding disc 3; the experimental conditions are shown in Table 1.

[0056] Table 1:

[0057] parameter Numeric Upper grinding plate loading pressure (N / Roller) 6 Upper grinding disc speed (rpm) -10 Lower grinding disc speed (rpm) 30 Lower grinding disc abrasive particle size (μm) 45 Electrolysis voltage (V) 20 Electrolysis gap (mm) 0.8 Duty Cycle 60％

[0058] After processing, the cylindrical roller's initial average roundness of 2.697μm and deviation of 0.502μm was reduced to an average roundness of 1.058μm and deviation of 0.216μm; Figure 7 , Figure 8 As shown in the figure, the initial and processed rollers of one of the cylindrical rollers were measured using a roundness measuring instrument, and it was found that the cylindrical roller's roundness decreased from an initial roundness of 2.737 μm to a roundness of 1.077 μm after processing; the cylindrical roller's average surface roughness decreased from an initial average surface roughness of 0.131 μm and a deviation of 0.029 μm to an average surface roughness of 0.075 μm and a deviation of 0.018 μm; Fig. 9 , Fig.10 The roughness meter was used to measure the initial and processed rollers of one of the cylindrical rollers, and the surface roughness was measured from the initial surface roughness Ra 0.13μm to the surface roughness Ra 0.072μm after processing. The experimental results show that the double-sided grinding process of silicon nitride cylindrical rollers using the above-mentioned double-plane grinding method can effectively improve the roundness and surface roughness of a batch of silicon nitride cylindrical rollers.

[0059] The above general description of the invention involved in this application and the description of its specific implementation methods should not be understood as limiting the technical solutions of the invention. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description and / or specific implementation methods (including examples) without violating the constituent elements of the invention involved, to form other technical solutions within the scope of protection of this application.

Claims

1. A double-plane grinding device based on electrolytic grinding disc shape control and sharpening, comprising a workbench (1); characterized in that: The workbench (1) is provided with a double-plane grinding processing module and a grinding disc electrolytic shape control and sharpening module; The double-plane grinding processing module comprises an upper grinding disc (2), a lower grinding disc (3), a retaining frame (4), an upper grinding disc motor (5), an upper grinding disc pressure assembly (6), a bevel gear (7), a bevel gear driving assembly (8), a lower grinding disc motor (9), a floating fixture (10), and a grinding liquid nozzle (11); the upper grinding disc (2) is a flat disc without abrasive grains, and the lower grinding disc (3) is a metal-bonded abrasive grain disc; the upper grinding disc pressure assembly (6) is arranged on the table surface of the workbench (1), the upper grinding disc motor (5) is arranged on the upper grinding disc pressure assembly (6), and the upper The output end of the grinding disc motor (5) is connected to the upper grinding disc (2) through a floating fixture (10), and can drive the upper grinding disc (2) to rotate. The upper grinding disc (2) is eccentrically arranged relative to the lower grinding disc (3); the upper grinding disc pressure component (6) can drive the upper grinding disc (2) to descend to contact with the workpiece and apply a set pressure; the lower grinding disc motor (9) is fixed to the lower side of the table surface of the workbench (1), and the lower grinding disc (3) is arranged on the upper side of the table surface of the workbench (1). The rotating shaft of the lower grinding disc motor (9) is connected to the lower grinding disc (3), and can drive the lower grinding disc (3) to rotate. The retainer (4) comprises a disc-shaped main body, on which workpiece limiting grooves (401) are arranged in groups, and a positioning hole (402) is arranged at the center thereof, and the positioning hole (402) can cooperate with a corresponding positioning shaft head (201) arranged at the center of the upper grinding disc (2) after the upper grinding disc (2) is pressed down, so as to radially limit the retainer (4); the edge of the disc-shaped main body is provided with transmission teeth (403) distributed upward, and the disc-shaped main body is in a plane shape, so that it can be placed on the lower grinding disc (3) to form a plane match with the lower grinding disc (3); The bevel gear drive assembly (8) is arranged on the workbench (1), the bevel gear (7) is arranged on the bevel gear drive assembly (8), and the bevel gear (7) can mesh with the transmission teeth (403) on the retaining frame (4); the bevel gear drive assembly (8) can control the bevel gear (7) to descend to mesh with the transmission teeth (403) of the retaining frame (4) correspondingly placed on the lower grinding disc (3), and can drive the bevel gear (7) to rotate; the grinding liquid nozzle (11) is fixed on the workbench (1), and can spray the electrolytic grinding liquid onto the surface of the lower grinding disc (3); The grinding disc electrolytic shape-controlled sharpening module comprises a tool electrode (12), an electrode adjustment component (13), and a power supply (14); the electrode adjustment component (13) is arranged on a workbench, the tool electrode (12) is arranged above a lower grinding disc (3) through the electrode adjustment component (13), and the electrode adjustment component (13) can measure and electrically adjust the gap between the tool electrode (12) and the lower grinding disc (3); the tool electrode (12) is electrically connected to the negative pole of the power supply (14), and the lower grinding disc (3) is electrically connected to the positive pole of the power supply (14).

2. The double-plane grinding processing device based on electrolytic shape control and sharpening of the grinding disc according to claim 1 is characterized in that: The upper grinding disc pressurizing assembly (6) comprises a mounting frame (601), wherein the mounting frame (601) is arranged on the workbench (1), and a servo screw slide (602) is arranged on the mounting frame (601), wherein the servo screw slide (602) is connected to the upper grinding disc motor (5) and can drive the upper grinding disc motor (5) to move in the vertical direction.

3. The double-plane grinding processing device based on electrolytic shape control and sharpening of the grinding disc according to claim 1 is characterized in that: A polishing liquid collecting tank (16) is provided on the table top of the workbench (1), and the lower grinding disc (3) is arranged in the polishing liquid collecting tank (16).

4. The double-plane grinding processing device based on electrolytic shape control and sharpening of the grinding disc according to claim 1 is characterized in that: The workpiece limiting grooves (401) are evenly distributed along the circumference around the positioning hole (402) on the retaining frame (4).

5. The double-plane grinding processing device based on electrolytic shape control and sharpening of the grinding disc according to claim 1 is characterized in that: The bevel gear driving assembly (8) comprises a bevel gear lifting slide (801), wherein the bevel gear lifting slide (801) is arranged on the workbench (1), and a bevel gear motor (802) is arranged on the bevel gear lifting slide (801), wherein the output shaft of the bevel gear motor (802) is connected to the bevel gear (7) and can drive the bevel gear (7) to rotate.

6. The double-plane grinding processing device based on electrolytic shape-controlled sharpening of the grinding disc according to claim 1 is characterized in that: The electrode adjustment assembly (13) comprises a servo fine-tuning slide (1301); the servo fine-tuning slide (1301) is arranged on the workbench (1), and a flat-nose pliers (1302) is arranged on the servo fine-tuning slide (1301); the tool electrode (12) is clamped and fixed by the flat-nose pliers (1302), and the distance between the tool electrode (12) and the lower grinding disc (3) can be adjusted by the servo fine-tuning slide (1301).

7. The double-plane grinding processing device based on electrolytic shape control and sharpening of the grinding disc according to claim 6 is characterized in that: The electrode adjustment assembly (13) further comprises a distance sensor (1303), wherein the distance sensor (1303) is capable of measuring the gap between the tool electrode (12) and the lower grinding disc (3).

8. The double-plane grinding processing device based on electrolytic shape-controlled sharpening of the grinding disc according to claim 1 is characterized in that: A carbon brush (15) is provided on the side of the lower grinding disc (3), and the positive electrode of the power source (14) is electrically connected to the carbon brush (15).

9. A double-plane grinding method based on electrolytic grinding disc shape control and sharpening, characterized in that: The method uses the double-plane grinding processing device based on electrolytic shape-controlled sharpening of the grinding disc according to claim 1 to grind the cylindrical roller, and comprises the following steps: S1: placing the retaining frame (4) on the lower grinding disc (3) in an eccentric manner so that its positioning hole (402) is opposite to the positioning shaft head (201) of the upper grinding disc (2); placing the cylindrical roller in the workpiece limiting groove (401), and adjusting the gap between the tool electrode (12) and the lower grinding disc (3) to an initial set value using the electrode adjustment assembly (13); S2: The upper grinding disc pressure component (6) drives the upper grinding disc (2) to press downward, so that the positioning shaft head (201) and the positioning hole (402) cooperate with each other, and apply a set pressure to the cylindrical roller; the bevel gear driving component (8) drives the bevel gear (7) to descend, so that it meshes with the transmission teeth (403) on the edge of the retaining frame (4); S3: processing starts; the upper grinding disc (2), the lower grinding disc (3) and the retaining frame (4) rotate at a set speed; the grinding fluid nozzle (11) continuously sprays electrolytic grinding fluid to the lower grinding disc (3); under the action of electrolysis, an anodic oxidation reaction occurs on the surface of the lower grinding disc (3), generating an easily removable oxide film (17); as the grinding proceeds, the oxide film (17) is removed under the action of friction, the passivated abrasive particles fall off, exposing new abrasive particles inside, so that the surface of the lower grinding disc (3) always has sharp abrasive particles; During the grinding process, when the electrode adjustment component (13) measures that the gap between the tool electrode (12) and the lower grinding disc (3) exceeds a set deviation range, the controller actively adjusts the gap between the tool electrode (12) and the lower grinding disc (3) to an initial set value; S4: After the processing reaches the set time, the power supply (14) is turned off, and the upper grinding disc motor (5), the lower grinding disc motor (9) and the bevel gear (7) stop rotating; then, the upper grinding disc (2) and the bevel gear (7) rise and reset, and the processed cylindrical roller can be taken out.

10. The double-plane grinding method based on electrolytic shape-controlled sharpening of the grinding disc according to claim 9, characterized in that: The initial setting value is 0.2-1 mm.

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