Microsphere polishing device and method

Abstract

The application discloses a kind of microspheres grinding processing device and processing method, mainly including grinding mechanism, pressurizing mechanism and driving mechanism, grinding mechanism is equipped with grinding disc and turntable, ball and grinding fluid are arranged between grinding disc and turntable, grinding disc is connected to pressurizing mechanism, turntable is connected to driving mechanism, turntable is equipped with annular groove for driving ball rotation, so that ball can rotate in groove, realize the grinding processing of batch ball, improve processing efficiency and precision, guarantee the consistency of ball processing, it is beneficial to the application and popularization of the processing device in the field of ball precision machining technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ball precision machining, and is a micro ball grinding and machining device and method. BACKGROUND

[0002] With the development and expansion of the super-precision grinding industry of balls, various grinding methods for improving the precision of balls have been proposed. At present, the main way for super-precision grinding of balls at home and abroad is to use V-shaped grooves for groove form, flat discs for upper discs, and free abrasives for material removal. The main grinding methods include variable-curvature groove grinding method, double-turntable grinding method, eccentric circular groove grinding method, etc. These grinding methods mainly expand the ball surface grinding track by changing the change of the ball rotation angle. The variable-curvature groove grinding method can achieve high-precision grinding of batch conventional balls, but has the disadvantages of complex structure and unsuitability for millimeter-level ball grinding. The double-turntable grinding method can control the ball surface grinding path by changing the rotation speed of the inner and outer turntables, achieve uniform and full coverage of the grinding track, and then achieve high-precision ball grinding, but has the disadvantage of high coaxiality requirement for the inner and outer turntables and unsuitability for millimeter-level ball grinding. The eccentric circular groove grinding method has the advantage of simple structure, but the theoretical ball surface grinding track is only a three-segment circular arc band, which cannot achieve full coverage of the ball surface grinding track, and the grinding effect is poor. At present, most ball machining methods use free abrasives to remove the material of the ball. The free abrasive material removal form mainly adopts the three-body removal method, the grinding is mainly in the form of particles, and the single abrasive grain plays a small role, so the grinding efficiency is low.

[0003] In order to solve the problem of super-precision grinding of millimeter-level balls, the patent document CN201911005628.X provides a super-precision ball variable-friction coefficient grinding method, which uses a specific-shaped groove and a variable-friction fixed abrasive disc to grind the ball together. The groove path is composed of four straight lines and four eccentric circular arc segments, the flat disc surface is divided into fan-shaped regions according to the set rules, and different materials are used in adjacent fan-shaped regions. However, during the grinding process, the balls may gather, especially when grinding millimeter-level balls, the balls may run out of the track, and the grinding cannot proceed smoothly. This groove path is not convenient for millimeter-level ball grinding. The double-plane grinding method is a common millimeter-level ball grinding method, which is composed of two flat discs and a retainer. This grinding method has the advantages of simple structure and suitability for grinding conventional balls and millimeter-level balls. However, the motion state of the ball in the grinding method is difficult to control, the method does not meet the ball forming rules, the ball grinding precision is difficult to guarantee, and the grinding efficiency is low.

[0004] Therefore, based on the variable-friction coefficient grinding device, the present application provides a micro ball high-efficiency high-precision high-consistency grinding method, which aims to solve the problems of low grinding efficiency and low precision, and is suitable for grinding balls of different specifications. SUMMARY

[0005] In order to overcome the defects in the prior art described above, the first inventive purpose of the present application is to provide a micro-sphere grinding device, which is clever in structure and can realize grinding of micro-spheres by setting a grinding mechanism, a pressurizing mechanism and a driving mechanism, thereby improving grinding precision and efficiency and being conducive to application and promotion of the grinding device in the field of sphere precision machining. The second inventive purpose of the present application is to provide a micro-sphere grinding method based on the above-mentioned micro-sphere grinding device, which is simple in processing and can realize batch and efficient grinding of spheres, and is more conducive to grinding of micro-spheres compared with the prior art.

[0006] The above-mentioned micro-sphere grinding device and the micro-sphere grinding method are technically interrelated and belong to the same inventive concept.

[0007] In order to achieve the first inventive purpose, the present application adopts the following technical scheme: a micro-sphere grinding device, comprising a grinding mechanism, a pressurizing mechanism and a driving mechanism, wherein the grinding mechanism is provided with a grinding disc and a turntable, spheres and grinding liquid are arranged between the grinding disc and the turntable, the grinding disc is connected to the pressurizing mechanism, the turntable is connected to the driving mechanism, and the turntable is provided with annular grooves for driving the spheres to rotate.

[0008] As a preferred scheme of the present application, the annular grooves comprise straight grooves and arc grooves, and the straight grooves and the arc grooves are both multiple and alternately distributed.

[0009] As a preferred scheme of the present application, the straight grooves and the arc grooves are connected to form V-shaped grooves.

[0010] As a preferred scheme of the present application, the grinding disc comprises grinding parts and fixing parts, and the grinding parts and the fixing parts are both multiple and alternately distributed.

[0011] As a preferred scheme of the present application, the pressurizing mechanism comprises a driving member, a pressurizing frame, a pressure sensor, an elastic member and a limiting bolt, the limiting bolt is installed on the pressure sensor, the elastic member is sleeved on the limiting bolt and located between the pressure sensor and the pressurizing frame, and the pressure sensor is installed on the lower end of the driving member.

[0012] As a preferred scheme of the present application, the driving member comprises a worm gear and a lead screw, the worm gear is connected to the lead screw, and the lead screw is installed on a fixing frame.

[0013] As a preferred scheme of the present application, baffle plates are sleeved on both sides of the fixing frame, and the baffle plates are connected to the grinding disc.

[0014] As a preferred scheme of the present application, the baffle is provided with a horizontal clamp, one end of which is mounted on the baffle and the other end of which is close to the bottom of the pressing frame.

[0015] As a preferred scheme of the present application, the driving mechanism comprises a driving motor and a bearing disc, the bearing disc being connected to the driving motor, and the rotating disc being mounted on the bearing disc.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The micro-sphere grinding device comprises a grinding mechanism, a pressing mechanism and a driving mechanism, the grinding mechanism being provided with a grinding disc and a rotating disc, the grinding disc and the rotating disc being arranged with spheres and grinding liquid therebetween, the grinding disc being connected to the pressing mechanism, the rotating disc being connected to the driving mechanism, and the rotating disc being provided with an annular groove for driving the spheres to rotate, so that the spheres can rotate in the groove, the grinding and processing of the batch spheres are realized, the processing efficiency and precision are improved, the consistency of the sphere processing is ensured, and the application and popularization of the processing device in the field of sphere precision processing technology are facilitated.

[0018] 2. The annular groove of the device comprises a straight groove and an arc-shaped groove, the spheres move in the arc-shaped groove and are less affected by the interaction between the spheres, and the spheres move in the straight groove and obtain a higher material removal efficiency.

[0019] 3. The grinding disc of the device is provided with a grinding part, and the material removal of the spheres is realized by the combined action of the grinding disc and the grinding liquid, so that the grinding efficiency is greatly improved.

[0020] 4. The grinding disc and the groove of the device can uniformly and fully cover the grinding track of the spheres, and the grinding precision is effectively improved.

[0021] 5. The driving mechanism of the device is provided with a driving motor, which can drive the rotating disc to rotate, the rotating speed of the rotating disc can be controlled through the motor, and the grinding efficiency is improved.

[0022] In order to achieve the above-mentioned second application purpose, the present application adopts the following technical scheme: a micro-sphere grinding method based on a micro-sphere grinding device, comprising the following steps: step 1, placing the spheres to be processed in the annular groove of the rotating disc; step 2, adding the grinding liquid between the grinding disc and the rotating disc; step 3, driving the pressing mechanism to press down by a required distance, so that the grinding disc presses the spheres; and step 4, starting the driving motor to drive the rotating disc to rotate, so as to realize the grinding and processing of the spheres.

[0023] Compared with the prior art, the beneficial effects of the microsphere grinding method are that: compared with the prior art of using a simple flat disc and groove to grind the sphere, the microsphere grinding method places the sphere to be processed in the annular groove, and grinds the sphere through the grinding disc and the grinding liquid, thereby effectively improving the grinding precision and efficiency, and facilitating the promotion and application of the above-mentioned processing method in the field of sphere precision machining technology. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of a microsphere grinding device in the embodiment;

[0025] Figure 2 is a structural schematic diagram of a pressure mechanism of a microsphere grinding device in the embodiment;

[0026] Figure 3 is a structural schematic diagram of a grinding mechanism of a microsphere grinding device in the embodiment;

[0027] Figure 4 is a structural schematic diagram of a driving mechanism of a microsphere grinding device in the embodiment;

[0028] Figure 5 is a structural schematic diagram of a turntable of a microsphere grinding device in the embodiment;

[0029] Figure 6 is a structural schematic diagram of a grinding disc of a microsphere grinding device in the embodiment.

[0030] Reference signs: 1, grinding mechanism; 11, grinding disc; 111, grinding part; 112, fixed part; 12, turntable; 121, annular groove; 1211, straight slot; 1212, arcuate slot; 2, pressure mechanism; 21, driving piece; 211, worm gear; 212, lead screw; 22, pressure frame; 23, pressure sensor; 24, elastic piece; 25, limit bolt; 3, driving mechanism; 31, driving motor; 32, bearing disc; 4, fixed frame; 5, baffle; 6, horizontal clamp. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0032] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example 1: As Figures 1 to 6 As shown, a micro-sphere grinding and processing device mainly includes a grinding mechanism 1, a pressurizing mechanism 2, and a driving mechanism 3. The grinding mechanism 1 is provided with a grinding disc 11 and a turntable 12. A sphere and grinding fluid are arranged between the grinding disc 11 and the turntable 12. The grinding disc 11 is connected to the pressurizing mechanism 2, and the turntable 12 is connected to the driving mechanism 3. The turntable 12 is provided with an annular groove 121 for driving the sphere to rotate. When the sphere to be processed is placed in the annular groove 121, the driving mechanism 3 is started, and the turntable 12 rotates, which can realize the grinding and processing of the sphere, improve the processing accuracy and efficiency, and ensure the consistency of the sphere processing.

[0035] In this embodiment, the annular groove 121 includes a straight groove 1211 and an arc-shaped groove 1212. The arc-shaped groove 1212 is a concentric circular arc segment. There are multiple straight grooves 1211 and arc-shaped grooves 1212, which are equidistantly arranged along the circumference of the turntable 12 and are alternately distributed. The ball moves at a constant speed in the arc-shaped groove 1212, which can minimize the collision and friction between the balls during the grinding process and reduce the influence of the interaction between the balls. When the ball moves on the path of the straight groove 1211, the ball will rotate perpendicular to the groove path direction, realizing the change of the ball's rotation angle, thereby spreading the grinding trajectory. At the same time, the grinding part of the ball and the abrasive grains have the maximum relative motion speed, achieving the highest material removal efficiency.

[0036] Furthermore, the straight groove 1211 connects to the arc groove 1212 to form a V-shaped groove. Driven by the turntable 12, the ball moves along the groove path. The ball's rotation angle changes with the curvature of the groove path and the contact area between the ball and the grinding disc 11. The spatial orientation of the ball changes, the grinding trajectory spreads, and finally the grinding trajectory of the ball is fully covered, effectively improving the grinding effect of the ball.

[0037] In order to improve the grinding efficiency of the ball, the grinding disc 11 comprises a grinding part 111 and a fixed part 112, the grinding part 111 is a fixed abrasive grain block, is a fan shape, is sintered by mixing abrasive grains and a binder, the binder can adopt bronze binder, resin binder, ceramic binder and the like; the abrasive grains can be selected from diamond, alumina, zirconia and the like according to the material of the ball and different processes, and the material removal mode between the ball and the grinding part 111 is two-body removal. The fixed part 112 is a flat plate without abrasive grain block, the grinding part 111 and the fixed part 112 are multiple and are arranged at equal angles along the circumference of the grinding disc 11, and are alternately distributed, when the ball contacts the grinding part 111, the ball surface material removal is mainly affected by the fixed abrasive grains, and is removed in a two-body removal mode; when the ball contacts the fixed part 112, the ball surface material removal is mainly affected by the free abrasive grains of the grinding fluid, and is removed in a three-body removal mode, the grinding tracks of the two material removal modes can fully cover the ball surface, and high-efficiency and high-precision grinding of the ball is realized.

[0038] The pressing mechanism 2 of the embodiment comprises a driving member 21, a pressing frame 22, a pressure sensor 23, an elastic member 24 and a limiting bolt 25, a plurality of limiting bolts 25 are equidistantly arranged along the circumference of the pressure sensor 23, the elastic member 24 is a spring, is sleeved outside the limiting bolt 25 and is located between the pressure sensor 23 and the pressing frame 22, the pressure sensor 23 is installed at the lower end of the driving member 21, when the driving member 21 descends, the pressing frame 22 presses the grinding disc 11 to apply pressure to the ball, the spring is stretched, the pressure applied to the ball by the pressing mechanism 2 is obtained by observing the change of the indication of the pressure sensor 23, the decrease of the indication of the pressure sensor 23 is the pressure received by the ball, facilitating the reading of the pressure, the setting of the elastic member 24 can also realize the leveling function of the grinding disc 11, so that the grinding disc 11 contacts each ball, and the consistency of the ball grinding is ensured.

[0039] In order to facilitate the application of pressure, the driving member 21 comprises a worm gear 211 and a lead screw 212, the worm gear 211 is threadedly connected with the lead screw 212, the lead screw 212 is perpendicularly installed on the upper part of the fixed frame 4 through threaded connection, the driving worm gear 211 can realize the lifting of the lead screw 212, the pressure can be more accurately controlled, and the convenience of operation is improved.

[0040] In order to prevent the grinding disc 11 from separating from the device during the machining process, the baffle 5 is sleeved on the stand on both sides of the fixed frame 4, the baffle 5 is fixedly installed on the upper surface of the grinding disc 11, a small gap is left between the installation of the baffle 5 and the fixed frame 4, the grinding disc 11 is allowed to automatically level during the application of pressure, and the large amplitude swing of the grinding disc 11 is limited, the fixing of the baffles 5 on both sides makes the work of the grinding disc 11 more stable.

[0041] Further, in order to enable the pressing mechanism 2 to press the grinding disc 11, a horizontal clamp 6 is mounted on the baffle 5, one end of the horizontal clamp 6 is fixedly mounted on the baffle 5, and the other end is tightly attached to the bottom of the pressing frame 22, so that the pressing frame 22 can completely press the grinding disc 11, and the effect of applying pressure is ensured.

[0042] The driving mechanism 3 of the embodiment includes a driving motor 31 and a bearing disc 32, the bearing disc 32 is connected to the driving motor 31, the turntable 12 is fixedly mounted on the bearing disc 32 through bolts, the driving motor 31 is started to drive the bearing disc 32 to rotate, thereby driving the turntable 12 to rotate, and the machining of the ball is realized. The driving mechanism 3 can control the rotating speed of the turntable 12, and effectively improves the machining efficiency.

[0043] The ratio of the abrasive liquid used in the test is aluminum oxide (particle size 2 μm): kerosene: stearic acid = 10:89:1, the material of the grinding part 111 is ceramic binder and aluminum oxide (2 μm) abrasive particles, the grinding pressure is 1 N / ball, the rotating speed of the turntable 12 is 40 rpm, the included angle between the two endpoints of the straight groove 1211 and the line connecting the center is 20 degrees, the radius of the arc-shaped groove 1212 is 70 mm, the number of the grinding part 111 in the grinding disc 11 is 4, and the included angle of the grinding part 111 area is 45 degrees, which is uniformly distributed in the grinding disc 11. Under the above grinding conditions, the bearing steel balls with a diameter of 1 mm were subjected to 2h and 5h of grinding test, the roundness of the ball before grinding was between 1.45 μm and 1.89 μm, the Talyrond 565 roundness instrument was used to measure the roundness of the steel ball, 10 balls were measured each time, and each ball was measured three times to take the average value. The best roundness after 2h of grinding was 0.16 μm, the average roundness before grinding was 1.68 μm, the average roundness after 2h of grinding decreased to 0.32 μm, and the roundness of all decreased to below 0.42 μm; the best roundness after 5h of grinding was 0.08 μm, reaching the G3 standard, the average roundness decreased to 0.14 μm, and the roundness of all decreased to below 0.20 μm. The roundness of the ball showed a better and better trend with the increase of the grinding time, the roundness improvement effect was very obvious, the mass of the ball changed from 3.98 mg / ball before grinding to 3.24 mg / ball, and decreased by 0.64 mg / ball. Under the same experimental conditions, compared with the existing grinding method, the efficiency and precision of this method have obvious advantages.

[0044] A micro ball grinding machining method, comprising the following steps:

[0045] Step 1, placing the ball to be machined in the annular groove 121 of the turntable 12;

[0046] Step 2, adding the abrasive liquid between the grinding disc 11 and the turntable 12;

[0047] Step 3, drive the pressing mechanism 2 to press down the required distance, so that the grinding disc 11 presses the ball;

[0048] Step 4, start the drive motor 31 to drive the rotating disc 12 to rotate, so as to realize the grinding processing of the ball.

[0049] The micro ball grinding processing device in the embodiment mainly comprises a grinding mechanism 1, a pressing mechanism 2 and a driving mechanism 3. The grinding mechanism 1 is provided with a grinding disc 11 and a rotating disc 12. The ball and the grinding liquid are arranged between the grinding disc 11 and the rotating disc 12. The grinding disc 11 is connected with the pressing mechanism 2. The rotating disc 12 is connected with the driving mechanism 3. The rotating disc 12 is provided with an annular groove 121 for driving the ball to rotate, so that the ball can rotate in the groove, realizing the grinding processing of the batch of balls, improving the processing efficiency and precision, ensuring the consistency of the ball processing, and being beneficial to the application and promotion of the processing device in the field of ball precision processing.

[0050] Embodiment 2: The difference between the embodiment and the embodiment 1 is that in the micro ball grinding processing device, the grinding disc 11 is bolted and installed at the bottom of the pressing frame 22, so that the installation of the horizontal clamp 6 is omitted. The pressure on the ball can be realized, and the working stability of the grinding disc 11 is improved. The installation is simple, and the working efficiency is improved.

[0051] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application; therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0052] Although the terms such as 1, grinding mechanism; 11, grinding disc; 111, grinding part; 112, fixed part; 12, rotating disc; 121, annular groove; 1211, straight slot; 1212, arcuate slot; 2, pressing mechanism; 21, driving part; 211, worm gear; 212, lead screw; 22, pressing frame; 23, pressure sensor; 24, elastic part; 25, limiting bolt; 3, driving mechanism; 31, drive motor; 32, weight plate; 4, fixed frame; 5, baffle; 6, horizontal clamp, etc. are used frequently in the drawings, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A micro-sphere grinding and processing device, characterized in that: The device includes a grinding mechanism (1), a pressurizing mechanism (2), and a driving mechanism (3). The grinding mechanism (1) is provided with a grinding disc (11) and a turntable (12). A ball and a grinding fluid are arranged between the grinding disc (11) and the turntable (12). The grinding disc (11) is connected to the pressurizing mechanism (2), and the turntable (12) is connected to the driving mechanism (3). The turntable (12) is provided with an annular groove (121) for driving the ball to rotate. The annular groove (121) includes a straight groove (1211) and an arc groove (1212). The arc groove (121) is a concentric arc segment. There are multiple straight grooves (1211) and arc grooves (1212), which are equidistant along the axial direction of the turntable (12) and are alternately distributed. A V-shaped groove is formed at the connection between the straight groove (1211) and the arc groove (1212).

2. The micro-sphere grinding and processing device according to claim 1, characterized in that: The grinding disc (11) includes a grinding part (111) and a fixing part (112), and there are multiple grinding parts (111) and fixing parts (112) that are alternately distributed.

3. The micro-sphere grinding and processing device according to claim 1, characterized in that: The pressurizing mechanism (2) includes a drive component (21), a pressurizing frame (22), a pressure sensor (23), an elastic element (24), and a limiting bolt (25). The limiting bolt (25) is installed on the pressure sensor (23). The elastic element (24) is fitted on the limiting bolt (25) and is located between the pressure sensor (23) and the pressurizing frame (22). The pressure sensor (23) is installed at the lower end of the drive component (21).

4. The micro-sphere grinding and processing device according to claim 3, characterized in that: The drive component (21) includes a worm gear (211) and a lead screw (212), the worm gear (211) being connected to the lead screw (212), and the lead screw (212) being mounted on a fixed frame (4).

5. The micro-sphere grinding and processing device according to claim 4, characterized in that: The fixing frame (4) is fitted with baffles (5) on both sides, and the baffles (5) are connected to the grinding disc (11).

6. The micro-sphere grinding and processing device according to claim 5, characterized in that: The baffle (5) is provided with a horizontal clamp (6), one end of which is installed on the baffle (5) and the other end is close to the bottom of the pressure frame (22).

7. The micro-sphere grinding and processing device according to claim 1, characterized in that: The drive mechanism (3) includes a drive motor (31) and a load-bearing plate (32), the load-bearing plate (32) is connected to the drive motor (31), and the turntable (12) is mounted on the load-bearing plate (32).

8. A method for grinding and processing microspheres, based on a microsphere grinding and processing apparatus as described in any one of claims 1 to 7, characterized in that: Includes the following steps: Step 1: Place the ball to be processed in the annular groove (121) of the turntable (12); Step 2: Add the grinding liquid between the grinding disc (11) and the turntable (12); Step 3: Drive the pressurizing mechanism (2) to press down the required distance so that the grinding disc (11) presses down on the ball; Step 4: Start the drive motor (31) to make the turntable (12) rotate and realize the grinding process of the ball.

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