A device and method for automatically adding grinding fluid during grinding process

Abstract

The present invention provides a device and method for automatically adding grinding fluid during grinding processing, the device includes a visual processing system and a liquid adding device, the visual processing system includes a light source, a camera, a host and visual processing software, the camera is fixed on the grinding and polishing machine through a support, the light source is arranged at the bottom of the camera lens and is aligned with the processing area of ​​the grinding and polishing machine, and the visual processing software runs on the host; the liquid adding device is fixed on the grinding and polishing machine, and its liquid adding end is aligned with the workpiece to be processed, and the camera and the liquid adding device are connected to the host. The device has a high degree of automation, avoiding the repetitive and monotonous labor of the processor, and at the same time, the grinding fluid is added evenly, the processing parameters can be memorized and repeated, and it has good processing consistency; the addition parameters of the grinding fluid are accurately controlled, which is conducive to improving the processing accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of precision machining, and in particular relates to a device for automatically adding grinding fluid during a grinding process and a method for adding grinding fluid using the device. Background Art

[0002] In the field of precision and ultra-precision machining, parts machining mainly adopts the method of small removal and multiple processing to approach the processing parameters. The grinding fluid made of micro-powder abrasive and related liquid ratio has good practicality when machining workpieces with small removal.

[0003] However, the grinding fluid is not a solution, but a suspension. The micro-powder abrasive is only suspended in the liquid. After shaking and standing for a period of time, the micro-powder abrasive will still settle at the bottom of the grinding fluid container. In order to ensure the relative uniformity of the grinding process, the grinding fluid needs to be stirred regularly. At present, the grinding fluid is mainly added manually, and it is necessary to manually put the grinding fluid into a uniform state regularly. During the grinding process, the frequency and position of the grinding fluid addition, the volume added each time, the area covered by the grinding fluid, and whether the abrasive distribution in the grinding fluid is uniform are very accidental and random. Uneven addition of grinding fluid leads to uneven removal of different positions of the workpiece, resulting in a decrease in processing quality and grinding efficiency, and increasing processing costs. During the processing, the operator needs to do a lot of repetitive and monotonous labor; and the volume of grinding fluid added manually each time, the frequency of adding grinding fluid, etc. are very accidental and uncertain, making the processing quality and processing process difficult to control. Summary of the invention

[0004] In order to solve the problems of uneven manual addition of grinding fluid and non-automatic addition process in current precision and ultra-precision machining processes, the purpose of the present invention is to provide a device for automatically adding grinding fluid during the grinding process and a method for adding grinding fluid using the device.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A device for automatically adding grinding fluid during a grinding process, the device comprising a visual processing system and a liquid adding device, the visual processing system comprising a light source, a camera, a host and visual processing software, the camera is fixed to a grinding and polishing machine through a support, the light source is arranged at the bottom of the camera lens and is aimed at the processing area of ​​the grinding and polishing machine, and the visual processing software runs on the host; the liquid adding device is fixed to the grinding and polishing machine, and its liquid adding end is aimed at a workpiece to be processed, and the camera and the liquid adding device are connected to the host.

[0007] Furthermore, the support member includes a base plate, a column, a camera support plate and a camera adjustment device, the base plate is fixed to the table top of the grinding and polishing machine by bolts, the column is fixed to the base plate by bolts, the camera support plate is fixed to the top of the column, and the camera is fixed to the vertical end face of the camera support plate by the camera adjustment device.

[0008] Furthermore, the light source is fixed on the column via a light source support plate.

[0009] Furthermore, the liquid adding device includes a nozzle, a liquid guide tube, a control valve, a liquid storage tank and an agitator, the nozzle is connected to the liquid outlet end of the liquid guide tube, the control valve is connected between the liquid guide tube and the liquid storage tank, and the visual processing software controls the opening and closing of the control valve.

[0010] Furthermore, the stirrer is an electric stirrer or a magnetic stirrer.

[0011] Furthermore, a rocker arm assembly, an eccentric rod assembly and a grinding disc are fixed on the grinding and polishing machine, and a workpiece is placed on the grinding disc and fixed by a push rod at the end of the rocker arm assembly.

[0012] The method for automatically adding grinding liquid using the above-mentioned device for automatically adding grinding liquid comprises the following steps:

[0013] (1) When the grinding and polishing machine is not performing fixed-axis processing, the visual processing system compares the area ratio of the workpiece and the grinding disc in real time, and sends a signal to add grinding fluid according to the set threshold parameters;

[0014] (2) When the grinding and polishing machine is performing fixed-axis processing, the visual processing system obtains the rotation speed of the workpiece and sends a grinding fluid addition signal to add grinding fluid according to the set frequency parameters.

[0015] Furthermore, the addition parameters of the polishing liquid include the addition position, the addition frequency, the addition volume and the coverage area.

[0016] Furthermore, the grinding liquid adding method includes high-pressure atomization, medium-low pressure spraying or pressureless extrusion.

[0017] Beneficial effects: The present invention provides a device and method for automatically adding grinding fluid during grinding processing. The present invention mainly uses machine vision methods to track and monitor the movement state of the workpiece in the area on the grinding disk, thereby controlling the adding method, frequency, volume and other parameters of the grinding fluid, and realizing the automatic addition of the grinding fluid. The preset parameters can be set by the processor. This device can be combined with the processor's experience and related machine learning, grinding trajectory simulation, etc., and has the storage function of various processing parameters. The processing parameters can be saved, which is convenient for later evaluation and analysis of the processing effect, process optimization, and improvement of processing efficiency and processing accuracy.

[0018] The device has the following advantages:

[0019] (1) High degree of automation, avoiding repetitive and monotonous work of processors;

[0020] (2) The grinding fluid is added evenly, and the location and volume of the grinding fluid are evenly added, which greatly improves the processing quality and efficiency;

[0021] (3) The processing parameters are memorizable and repeatable. For better processing results, the parameter settings can be traced back and saved; when batch-producing workpieces, good processing consistency can be achieved;

[0022] (4) Strong controllability. The present invention uses a machine to accurately control the addition method of the grinding liquid according to various set parameters, replacing the manual addition process, which is beneficial to improving the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the processing trajectory diagram of the grinding and polishing machine;

[0024] Figure 2 It is a system framework diagram of the device of the present invention;

[0025] Figure 3 It is the workflow diagram of the visual processing system;

[0026] Figure 4 Added flow chart for grinding fluid;

[0027] Figure 5 A front view of the device of the present invention;

[0028] Figure 6 It is a three-dimensional diagram of the device described in the present invention.

[0029] In the figure: 1. visual processing system; 11. light source; 12. camera; 13. support member; 131. base plate; 132. column; 133. camera support plate; 134. camera adjustment device; 135. light source support plate; 2. liquid adding device; 21. nozzle; 22. liquid guide tube; 3. grinding and polishing machine; 31. pendulum assembly; 311. pendulum; 32. eccentric rod assembly; 33. grinding disc; 34. workpiece; 35. push rod. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with specific embodiments, but the embodiments are only exemplary and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention can be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the protection scope of the present invention.

[0031] A device for automatically adding grinding fluid during grinding process, such as Figure 5 , 6 As shown, the device includes a visual processing system 1 and a liquid adding device 2, the visual processing system 1 includes a light source 11, a camera 12, a host and visual processing software, the camera 12 is fixed on the grinding and polishing machine 3 through a support 13, the light source 11 is arranged at the bottom of the camera lens and is aimed at the processing area of ​​the grinding and polishing machine, and the visual processing software runs on the host; the liquid adding device 2 is fixed on the grinding and polishing machine 3, and its liquid adding end is aimed at the workpiece to be processed, and the camera 12 and the liquid adding device 2 are connected to the host.

[0032] The support member 13 includes a base plate 131, a column 132, a camera support plate 133 and a camera adjustment device 134. The base plate 131 is fixed to the desktop of the grinding and polishing machine by bolts, the column 132 is fixed to the base plate 131 by bolts, the camera support plate 133 is fixed to the top of the column 132, and the camera 12 is fixed to the vertical end face of the camera support plate 133 by the camera adjustment device 134.

[0033] The light source 11 is fixed on the column 132 via a light source support plate 135 .

[0034] The liquid adding device 2 comprises a nozzle 21, a liquid guiding tube 22, a control valve, a liquid storage tank and an agitator. The nozzle 21 is connected to the liquid outlet end of the liquid guiding tube 22, the control valve is connected between the liquid guiding tube and the liquid storage tank, and the visual processing software controls the opening and closing of the control valve.

[0035] The stirrer is an electric stirrer or a magnetic stirrer.

[0036] A rocker assembly 31 , an eccentric rod assembly 32 and a grinding disc 33 are fixed on the grinding and polishing machine. A workpiece 34 is placed on the grinding disc 33 and is fixed by a push rod 35 at the end of the rocker assembly 31 .

[0037] Figure 1 The processing trajectory diagram of the grinding and polishing machine can be divided into fixed-axis processing and non-fixed-axis processing according to whether the center of the workpiece changes during processing. During the processing, the grinding disc 33 rotates at a constant speed, and the workpiece 34 rotates with it. When the fixed-axis processing is performed, the pendulum 311 is stationary and the workpiece rotates along the center O2; when the non-fixed-axis processing is performed, the pendulum 311 swings around the fixed point O3, and the rotation center of the workpiece 34 will make a periodic swing from O2 to O2'. Figure 1 It can be seen that the intersection of the rectangular dotted line and the grinding disc 33 is used as the monitoring area, and the area ratio of the workpiece 34 to the grinding disc 33 is obtained in real time using the machine vision method. Figure 1It can be seen that when the workpiece 34 moves out of the monitoring area, the area ratio of the workpiece 34 to the grinding disc 33 is 0, which is the smallest at this time; when the workpiece 2 gradually leaves the monitoring area or gradually enters the monitoring area, the area ratio will change; when the entire area of ​​the workpiece is in the monitoring area or leaves as a whole, the area ratio will not change. Therefore, when non-fixed-axis processing is performed, the area ratio of the workpiece 34 to the grinding disc 33 is compared in real time as a control signal to issue an instruction; when fixed-axis processing is performed, the area ratio of the workpiece 34 to the grinding disc 33 is a fixed value, and there is no need to compare the area ratio of the two in real time. At this time, the visual processing system tracks the workpiece rotation speed in real time, and according to the preset grinding fluid addition frequency, the volume of grinding fluid added each time and other parameters, the command is issued as a control signal.

[0038] Figure 2 This is the system framework diagram of the device described in the present invention. First, the light source in the visual processing system shines on the monitoring area, and the camera captures the movement of the workpiece in real time, transmits the image to the host, and the visual processing software processes it to monitor the ratio of the area of ​​the workpiece to the grinding disc or the rotation speed of the workpiece in real time. When the movement state of the workpiece reaches the set parameters, the visual processing system sends a control signal to add grinding fluid. The processing flow chart of the visual processing system is shown in FIG. Figure 3 The grinding liquid adding device uses a stirrer to process the raw materials input into the liquid storage tank, and mixes and stirs them according to the set ratio of each component. Since the grinding liquid is a suspension, the grinding liquid in the liquid storage tank needs to be stirred all the time. According to the setting, when there is grinding liquid in the liquid storage tank, the grinding liquid is applied when the control parameter signal is sent. The grinding liquid adding flow chart is shown as follows Figure 4 shown.

[0039] Since the device includes a host and processing software, it has storage capacity and can store several set parameter values. After the processing is completed, the processing parameters can be compared according to the processing effect to optimize the processing technology. The visual processing software is scalable and can perform further simulation analysis when the grinding disc and workpiece features are identified.

Claims

1. A method for automatically adding grinding fluid during grinding process, It is characterized in that The device for automatically adding grinding fluid during grinding processing comprises a visual processing system and a liquid adding device, wherein the visual processing system comprises a light source, a camera, a host and visual processing software, wherein the camera is fixed on a grinding and polishing machine through a support, the light source is arranged at the bottom of the camera lens and is aimed at the processing area of ​​the grinding and polishing machine, and the visual processing software runs on the host; the liquid adding device is fixed on the grinding and polishing machine, and its liquid adding end is aimed at the workpiece to be processed, the camera and the liquid adding device are connected to the host, and a swing arm assembly, an eccentric rod assembly and a grinding disc are fixed on the grinding and polishing machine, and a workpiece is placed on the grinding disc and fixed by a top rod at the end of the swing arm assembly; The method for automatically adding grinding fluid during grinding processing comprises the following steps: (1) when the grinding and polishing machine is in non-fixed axis processing, the visual processing system compares the area ratio of the workpiece and the grinding disc in real time, and sends a grinding fluid adding signal according to the set threshold parameters to add grinding fluid; (2) when the grinding and polishing machine is in fixed axis processing, the visual processing system obtains the rotation speed of the workpiece, and sends a grinding fluid adding signal according to the set frequency parameters to add grinding fluid.

2. A method for automatically adding grinding fluid during a grinding process according to claim 1, It is characterized in that The support member includes a base plate, a column, a camera support plate and a camera adjustment device. The base plate is fixed to the desktop of the grinding and polishing machine by bolts, the column is fixed to the base plate by bolts, the camera support plate is fixed to the top of the column, and the camera is fixed to the vertical end face of the camera support plate by the camera adjustment device.

3. A method for automatically adding grinding fluid during a grinding process according to claim 2, It is characterized in that The light source is fixed on the column through a light source support plate.

4. The method for automatically adding grinding fluid during grinding process according to claim 1, It is characterized in that The liquid adding device includes a nozzle, a liquid guiding tube, a control valve, a liquid storage tank and an agitator. The nozzle is connected to the liquid outlet end of the liquid guiding tube, the control valve is connected between the liquid guiding tube and the liquid storage tank, and the visual processing software controls the opening and closing of the control valve.

5. A method for automatically adding grinding fluid during grinding according to claim 4, It is characterized in that The stirrer is an electric stirrer or a magnetic stirrer.

6. The method for automatically adding grinding fluid during grinding process according to claim 1, It is characterized in that The parameters for adding slurry include the adding location, adding frequency, adding volume and coverage area.

7. The method for automatically adding grinding fluid during grinding process according to claim 1, It is characterized in that The methods of adding grinding fluid include high-pressure atomization, medium- and low-pressure spraying, or pressureless extrusion.

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