A microsphere double-plane grinding disc grinding device and processing method

Abstract

The present invention relates to a microsphere double-plane grinding disc grinding processing device, comprising an upper grinding disc, a lower grinding disc, a lower grinding disc driving mechanism for driving the lower grinding disc to rotate, a dressing ring, an auxiliary driving mechanism for driving the dressing ring and a frame, wherein the lower grinding disc and the lower grinding disc driving mechanism are installed on the frame, the dressing ring is installed above the lower grinding disc and is sleeved on the outside of the upper grinding disc, and a retaining frame with retaining grooves is also installed between the lower grinding disc and the upper grinding disc, the retaining grooves are arranged in a strip shape, and a plurality of retaining grooves are arranged along the circumferential direction of the retaining frame. The processing device can achieve full coverage of the grinding track, ensure the sphericity of the microspheres to meet the performance of the microspheres, and can effectively improve the processing rate of the microspheres. A microsphere double-plane grinding disc grinding processing method can ensure the uniformity of the microspheres and improve the processing efficiency of the device. Compared with the current technology, it is more suitable for small-batch ultra-precision processing of microspheres.

Description

Technical Field

[0001] The invention relates to the technical field of sphere processing and manufacturing, in particular to a microsphere double-plane grinding disc grinding processing device and a processing method. Background Art

[0002] With the development of lightweight and miniaturized mechanical products, miniature bearings, as the basic parts of miniaturized products, are also in great demand and are used in various industrial products, such as micro motors, digital cameras, instruments, precision milling machines, etc. As the key component of miniature bearings, the surface quality, sphericity and batch consistency of tiny spheres play a vital role in the quality and life of bearings.

[0003] Miniature bearings refer to metric series with an outer diameter less than 9mm; inch series with an outer diameter less than 9.525mm. The main materials are carbon steel, bearing steel, stainless steel, plastic, ceramic, etc. The smallest inner diameter can be 0.6mm, and the inner diameter is generally 1mm. Miniature bearings are suitable for various industrial equipment, small rotary motors and other high-speed and low-noise fields, such as: office equipment, micro motors, instrumentation, laser engraving, small clocks, soft drives, pressure rotors, dental drills, hard disk motors, stepper motors, video recorder drums, toy models, computer cooling fans, money counters, fax machines and other related fields.

[0004] High-precision micro bearing balls are important components for realizing the rotation of micro bearings. Their accuracy has a direct impact on the performance and life of micro bearings, and thus affects the overall performance of mechanical equipment using micro bearings. High-precision micro bearing balls are the most important basic components in the equipment.

[0005] There are many ways to process spheres, but due to the limitations of tiny spheres, the current common method for processing tiny spheres (spheres with a diameter less than 3mm) is still the traditional V-groove processing method. This method adopts: the upper and lower grinding discs are placed coaxially, the lower grinding disc has a V-groove concentric with the lower disc, and the upper disc is a flat disc, so that the small ball is in a three-arc contact state to grind the sphere. The advantages are simple structure and large number of balls processed in batches. The main problems of this processing method are: during the grinding process, the rotation angle of the sphere is a certain value, and the grinding trajectory of the sphere is 3 parallel rings. It is impossible to obtain the full envelope of the spherical trajectory, the sphericity of the processed sphere is low, and the processing efficiency is low. Although it is possible to artificially change the spherical trajectory by regular stirring, so that the envelope of the spherical trajectory is improved, and the processing quality is improved to a certain extent, the improved quality is unstable and random. At the same time, due to the small size of the sphere, affected by the coaxiality error of the grinding disc, machine vibration, abrasive action, etc., the sphere will be blocked during processing in the V-groove, and grinding will occur between the balls, causing the surface quality of the ball to deteriorate. Therefore, the sphere processed in this way often has poor accuracy.

[0006] In order to improve the shortcomings of the traditional concentric sphere grinding method, in order to obtain a higher precision sphere, the Chinese invention patent with application number 200610155411.3 discloses a planetary precision sphere grinding machine, which adopts a planetary plane grinding precision sphere grinding device to process the sphere, and the upper grinding disc adopts a fixed abrasive grinding disc, which can realize high efficiency and high precision processing of the sphere. However, since the upper grinding disc is independently driven and has a swing arm device, the grinding machine has a complex structure and high manufacturing cost, and the size of the sphere processed by it is small, which limits the thickness of the retainer. When the planetary precision sphere is used to grind and process a microsphere, the retainer is very thin, and it is necessary to drive the sphere to do swing arm motion and self-rotation motion, and the retainer is easily deformed and damaged, resulting in processing failure. And in the existing three-turntable processing method, the spherical trajectory can be fully enveloped, and the precision grinding processing of the sphere can be realized, but the device is often complicated, and the microsphere is small in size, so that the processing equipment cannot grind and process the microsphere. The four-axis machining method controls four grinding tools to grind the sphere. Only one sphere can be processed at a time, and the consistency of the ball batch is difficult to ensure. Due to the device reasons, it is also difficult to grind tiny spheres.

[0007] Therefore, in view of the limitations of the above-mentioned sphere processing method for processing micro-spheres, there is an urgent need for a precision grinding device suitable for micro-spheres to achieve high-precision processing of micro-spheres. Summary of the invention

[0008] In order to overcome the defects in the above-mentioned prior art, the first invention purpose of the present invention is to provide a microsphere double-plane grinding disc grinding processing device. The processing device has a simple and ingenious structure, can achieve full coverage of the grinding track, ensure the sphericity of the microspheres to meet the performance of the microspheres, and can effectively improve the processing rate of the microspheres, which is conducive to the promotion and application of the processing device in the field of bearing manufacturing technology. The second invention purpose of the present invention is to provide a microsphere double-plane grinding disc grinding processing method. Based on the above-mentioned microsphere double-plane grinding disc grinding processing device, this method can ensure the uniformity of the microspheres and improve the processing efficiency of the device. Compared with the current technology, it is more suitable for the processing of microspheres.

[0009] The above-mentioned micro-sphere double-plane grinding disc grinding processing device and the micro-sphere double-plane grinding disc grinding processing method are technically related to each other and belong to the same inventive concept.

[0010] In order to achieve the above-mentioned first invention purpose, the present invention adopts the following technical scheme: a microsphere double-plane grinding disc grinding processing device, comprising an upper grinding disc, a lower grinding disc, a lower grinding disc driving mechanism for driving the lower grinding disc to rotate, a dressing ring, an auxiliary driving mechanism for driving the dressing ring and a frame, the lower grinding disc and the lower grinding disc driving mechanism are installed on the frame, the dressing ring is installed above the lower grinding disc and is mounted on the outside of the upper grinding disc, and a retaining frame with retaining grooves is also installed between the lower grinding disc and the upper grinding disc, the retaining grooves are arranged in a long strip shape, and a plurality of the retaining grooves are arrayed circumferentially along the retaining frame.

[0011] As a preferred solution of the present invention, the auxiliary driving mechanism includes a base plate, a speed regulating motor, a transmission belt and two transmission wheels, one of the transmission wheels is installed on the output end of the speed regulating motor, and the other transmission wheel is rotatably installed on the base plate through a rotating shaft and is arranged in contact with the trimming ring to realize speed regulating drive of the trimming ring, and the transmission belt is connected between the two transmission wheels.

[0012] As a preferred solution of the present invention, the auxiliary drive mechanism also includes a tensioning mechanism, which includes a tensioning wheel, a tensioning bolt and a tensioning slot opened on the base plate. The tensioning wheel is installed between the two transmission wheels, and the tensioning wheel is respectively connected to the two transmission wheels through two transmission belts. The tensioning effect of the tensioning wheel is achieved by adjusting the position of the tensioning bolt in the tensioning slot.

[0013] As a preferred solution of the present invention, the base plate has an arc surface with the same curvature as the trimming ring, and a limiting pulley is further provided on the arc surface. The limiting pulley is rotatably mounted on the base plate through a rotating shaft and is arranged in contact with the trimming ring.

[0014] As a preferred solution of the present invention, the upper grinding disc is in the shape of a flat disc, and the lower grinding disc has fixed abrasive blocks, and the two fixed abrasive blocks are arranged diagonally.

[0015] As a preferred solution of the present invention, it also includes a brush capable of removing waste materials in the gaps of the fixed abrasive blocks. The frame is installed with a column, the brush is installed on the column and the brush head is pressed on the lower grinding disc.

[0016] As a preferred embodiment of the present invention, it further comprises a grinding liquid supply mechanism, which comprises a grinding liquid container, a conduit and a grinding liquid drive pump, and the grinding liquid drive pump is connected to the grinding liquid container through the conduit.

[0017] As a preferred solution of the present invention, a weight disc is placed above the upper grinding disc.

[0018] As a preferred solution of the present invention, the retaining frame is installed with a gasket.

[0019] Compared with the prior art, the beneficial effects of the present invention are: a microsphere double-plane grinding disc grinding processing device in the present invention has a simple and ingenious structure and is easy to process. By arranging an upper grinding disc, a lower grinding disc and a retaining frame, and opening a long retaining groove on the retaining frame, the ball can be driven by the upper grinding disc, the lower grinding disc and the retaining frame to perform orbital motion, spin motion and reciprocating motion along the length direction of the retaining groove around the center of the retaining frame, so that the grinding trajectory of the ball can achieve full coverage of the spherical surface, ensure the uniformity of the grinding of the ball, and then ensure the processing sphericity of the ball, improve the use performance of the ball, and be conducive to the promotion and application of the above-mentioned processing device in the field of ball processing technology.

[0020] Furthermore, the dressing ring in the present invention rotates under the drive of the speed regulating motor, and the lower grinding disc rotates under the drive of the lower grinding disc driving mechanism. During this process, the dressing ring and the lower grinding disc make relative movement and can grind each other to achieve online dressing of the lower grinding disc, thereby ensuring the grinding accuracy of the lower grinding disc and further ensuring the accuracy of the ground sphere.

[0021] Furthermore, the present invention opens a plurality of long retaining grooves on the retaining frame and places a single processed ball in a single retaining groove to prevent collision between balls. The ball can roll along the length direction of the retaining groove so that the grinding track of the ball evenly covers the surface of the ball, thereby ensuring the processed sphericity of the ball.

[0022] Furthermore, the present invention continuously supplies grinding liquid to the grinding disc through the grinding liquid supply mechanism, thereby increasing the grinding rate while ensuring the grinding accuracy of the ball.

[0023] In order to achieve the above-mentioned second invention purpose, the present invention adopts the following technical scheme: a microsphere double-plane grinding disc grinding processing method, based on the above-mentioned microsphere double-plane grinding disc grinding processing device; comprising the following steps: step 1, placing the retaining frame on the lower grinding disc, the sphere is loaded into the retaining groove of the retaining frame, the upper grinding disc is lightly pressed on the sphere, and the weight disc is pressed on the upper grinding disc; step 2, the retaining frame, the upper grinding disc and the weight disc are sleeved in the dressing ring, and the dressing ring is limited by a limiting pulley; step 3, starting the lower grinding disc driving mechanism, the lower grinding disc rotates, and drives the dressing ring and the retaining frame to rotate, and the sphere is driven by the upper grinding disc, the lower grinding disc and the retaining frame to perform orbital motion, spin motion and reciprocating motion along the retaining groove direction around the center of the retaining frame, and the grinding liquid is continuously supplied with a grinding liquid driving pump to achieve the grinding action of the sphere.

[0024] Compared with the prior art, the beneficial effect of the present invention is that a microsphere double-plane grinding disc grinding method in the present invention can effectively improve the processing rate while ensuring the processing quality of the tiny spheres, compared with the grinding method of the grinder in the prior art, which is conducive to the promotion and application of the above-mentioned processing method in the field of sphere processing and manufacturing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural cross-sectional view of a microsphere double-plane grinding disc grinding processing device in Example 1;

[0026] Figure 2 It is a top view of the structure of a microsphere double-plane grinding disc grinding processing device in Example 1;

[0027] Figure 3 It is a schematic structural diagram of a lower grinding disc in a microsphere double-plane grinding disc grinding processing device in Example 1;

[0028] Figure 4 It is a schematic structural diagram of a retainer in a microsphere double-plane grinding disc grinding processing device in Example 1;

[0029] Figure 5 It is a schematic structural diagram of a variable friction upper grinding disc in a microsphere double-plane grinding disc grinding processing device in Example 3.

[0030] Figure numerals: 1. grinding liquid container; 2. lower grinding disc drive mechanism; 3. grinding liquid drive pump; 4. conduit; 5. column; 6. locking nut; 7. brush; 8. dressing ring; 9. retaining frame; 9-1. retaining groove; 10. upper grinding disc; 11. weight disc; 12. sphere; 13. speed regulating motor; 14. lower grinding disc; 15. transmission spindle; 16. waste liquid tank; 17. frame; 18. bottom plate; 18-1. tensioning slide groove; 18-2. arc surface; 19. limiting pulley; 20. transmission belt; 21. transmission wheel; 22. tensioning wheel; 23. gasket; 24. tensioning bolt. DETAILED DESCRIPTION

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

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Example 1: Figures 1 to 4 As shown, a microsphere double-plane grinding disc grinding processing device is improved based on the existing grinding machine, and is mainly composed of an upper grinding disc 10, a lower grinding disc 14, a lower grinding disc driving mechanism 2 for driving the above-mentioned lower grinding disc 14 to rotate, a dressing ring 8, an auxiliary driving mechanism for driving the above-mentioned dressing ring 8 and a frame 17. The above-mentioned lower grinding disc 14 and the above-mentioned lower grinding disc driving mechanism 2 are installed on the frame 17 of the grinding machine. The lower grinding disc driving mechanism 2 is a stable driving motor to ensure the stability of the lower grinding disc during rotation. Specifically, a transmission main shaft 15 is connected between the lower grinding disc driving mechanism 2 and the lower grinding disc 14, and the transmission main shaft 15 is installed at the middle position of the bottom of the lower grinding disc 14. The dressing ring 8 is installed above the lower grinding disc 14 and is mounted on the outside of the upper grinding disc 10. A retaining frame 9 with a retaining groove 9-1 in the form of a through hole is also installed between the lower grinding disc 14 and the upper grinding disc 10, that is, the retaining groove 9-1 is a through groove that passes through from top to bottom. In order to be able to process multiple balls 12 at one time to increase the grinding rate of the grinder, and in order to enable the balls 12 to roll along the length direction of the retaining groove 9-1, the retaining groove 9-1 is arranged in a long strip shape, and multiple retaining grooves 9-1 are arranged circumferentially along the retaining frame 9.

[0035] In this embodiment, an upper grinding disc 10, a lower grinding disc 14 and a retaining frame 9 are arranged, and a long retaining groove 9-1 is opened on the retaining frame 9, so that the ball 12 can be driven by the upper grinding disc 10, the lower grinding disc 14 and the retaining frame 9 to perform orbital motion, spin motion around the center of the retaining frame 9 and reciprocate motion along the length direction of the retaining groove 9-1, so that the grinding trajectory of the ball 12 can achieve full coverage of the spherical surface, ensure the grinding uniformity of the ball 12, and then ensure the processing sphericity of the ball 12, improve the performance of the ball 12, and be conducive to the promotion and application of the above-mentioned processing device in the field of ball processing technology.

[0036] The auxiliary driving mechanism in this embodiment specifically includes a base plate 18, a speed regulating motor 13, a transmission belt 20 and two transmission wheels 21, one of the transmission wheels 21 is installed on the output end of the speed regulating motor 13, and the other transmission wheel 21 is rotatably installed on the base plate 18 through a rotating shaft and is arranged in contact with the dressing ring 8. The transmission belt 20 is connected between the two transmission wheels 21. The rotation speed of the transmission wheel 21 in contact with the dressing ring 8 is controlled by adjusting the rotation speed of the speed regulating motor 13, thereby adjusting the rotation speed of the dressing ring 8, the rotation speed of the upper grinding disc 10 and the revolution speed of the sphere 12 to achieve high-precision processing of the sphere 12.

[0037] The trimming ring 8 is placed on the lower grinding disc 14 with a fixed eccentricity, that is, it is not concentric with the lower grinding disc 14. In order to assist the auxiliary drive mechanism to drive the trimming ring 8, in this embodiment, an arc surface 18-2 having the same arc as the trimming ring 8 is formed on the bottom plate 18, and a limit pulley 19 is also provided at the arc surface 18-2. The limit pulley 19 is rotatably mounted on the bottom plate 18 through a rotating shaft and is in contact with the trimming ring 8. The trimming ring 8 is placed on the lower grinding disc 14 by its own weight. The trimming ring 8 is cylindrical, and its outer cylindrical surface is in contact with the limit pulley 19 and restricts movement, that is, the trimming ring 8 is restricted by the limit pulley 19 and the transmission wheel 21 at the same time, so that the trimming ring 8 can only rotate along its center position, and cannot move in the horizontal or longitudinal direction, so as to ensure the processing position of the sphere 12. Driven by the friction of the lower grinding disc 14, the dressing ring 8 can rotate around its own rotation center and perform online dressing on the lower grinding disc 14; driven by the auxiliary driving mechanism, the dressing ring 8 can be driven by the transmission wheel 21 to achieve speed adjustment, change the speed of the dressing ring 8 relative to the lower grinding disc 14, and grind the ball 12 at the optimal speed ratio. The inner hole of the dressing ring 8 can be matched with the retaining frame 9 and the upper grinding disc 10, and limit the position movement of the retaining frame 9 and the upper grinding disc 10. The retaining frame 9 is placed in the dressing ring 8, and the cross-sectional width of the retaining groove 9-1 is smaller than the diameter of the ball 12. The processed ball is placed in the retaining groove 9-1, and then the upper grinding disc 10 is placed in the dressing ring 8 and pressed on the ball 12. A weight plate 11 can also be added above the upper grinding disc 10 to change the grinding pressure.

[0038] The auxiliary driving mechanism in this embodiment also includes a tensioning mechanism, which includes a tensioning wheel 22, a tensioning bolt 24 and a tensioning slot 18-1 provided on the base plate 18. The tensioning wheel 22 is installed between the two transmission wheels 21, and the tensioning wheel 22 is respectively connected to the two transmission wheels 21 through two transmission belts 20. The tensioning effect of the tensioning wheel 22 is achieved by adjusting the position of the tensioning bolt 24 in the tensioning slot 18-1.

[0039] The upper grinding disc 10 in the present embodiment is in the shape of a flat disc, and the lower grinding disc 14 is a variable friction disc, that is, the friction coefficient on the surface of the lower grinding disc 14 is different. Specifically, the lower grinding disc 14 is provided with a fixed abrasive block 14-1, and the two fixed abrasive blocks 14-1 are arranged diagonally, so that when the sphere 12 passes through two discs with different friction coefficients, the rotation angle of the sphere 12 changes suddenly, so that the grinding track evenly covers the surface of the sphere 12, thereby improving the grinding accuracy of the sphere 12.

[0040] During the grinding process, in order to enable the dressing ring 8 to perform online dressing of the lower grinding disc 14, a brush 7 capable of removing waste materials in the gap of the fixed abrasive block 14-1 is further provided in the present embodiment. The frame 17 is provided with a column 5, and the brush 7 is installed on the column 5 with the brush head pressed on the lower grinding disc 14. That is, by providing the brush 7, the fixed abrasive block 14-1 of the lower grinding disc 14 can be sharpened to expose the sharp abrasive grains, so that the lower grinding disc 14 can always maintain a high surface accuracy, thereby ensuring the grinding accuracy and processing efficiency of the sphere 12.

[0041] In order to continuously provide grinding liquid to reduce the resistance during the grinding process, a grinding liquid supply mechanism is also provided in this embodiment. Specifically, the grinding liquid supply mechanism includes a grinding liquid container 1, a conduit 4 and a grinding liquid drive pump 3. The grinding liquid drive pump 3 is connected to the grinding liquid container 1 through the conduit 4. The grinding liquid drive pump 3 is a peristaltic pump, which is mainly composed of three parts: a driver, a pump head and a pump tube. During use, the fluid only contacts the pump tube and does not contact the pump body, which can effectively reduce the probability of fluid contamination, thereby making the grinding liquid reusable and reducing the processing cost. The conduit 4 is a rubber tube, mainly because the rubber tube has good tensile and compressive strength, which can effectively ensure the service life of the conduit 4 and reduce the use cost. The grinding liquid drips from the center above the lower grinding disc 14, and flows into the processing area under the action of the rotating centrifugal force of the lower grinding disc 14. The sphere 12 removes the surface material of the sphere 12 under the action of the lower grinding disc 14, the upper grinding disc 10 and the abrasive particles, and realizes the grinding of the sphere 12. The grinding liquid includes but is not limited to abrasive, base liquid and activator. The abrasive can be aluminum oxide, the abrasive particle size is 5 μm, the base liquid is kerosene, and the activator is stearic acid. The ratio of abrasive: base liquid: activator is 10:100:1. After being stirred evenly by a stirrer, a stable suspension is formed, and then dripped onto the lower grinding disc 14 through the grinding liquid driving pump 3.

[0042] There are 14 gaskets 23 attached to the contact surface of the retainer 9 and the lower grinding disc 14 to prevent the retainer 9 from being too tightly attached to the lower grinding disc 14, to ensure the rotation effect of the retainer 9, and to facilitate the flow of grinding liquid between the lower grinding disc 14 and the retainer 9 and the discharge of grinding waste. The retainer 9, the lower grinding disc 14 and the inner hole wall of the dressing ring 8 form a friction pair. Under the restriction of the dressing ring 8 and the drive of the lower grinding disc 14, the retainer 9 can rotate around its own rotation center, and the material of the retainer 9 is softer than that of the ball 12, and no material removal is generated on the ball 12.

[0043] The lower grinding disc 14 in this embodiment is actively driven, and is connected to the bottom transmission main shaft 15 through a positioning pin at the bottom. When the sphere 12 rolls through the area of ​​the lower grinding disc 14 with different friction coefficients during grinding, the rotation axis of the sphere 12 changes suddenly, so that the grinding trajectory of the sphere 12 does not overlap periodically, and the trajectory is fully enveloping. The upper grinding disc 10 is driven, placed in the dressing ring 8, and pressed on the sphere 12, leaving a small gap between the outer side and the inner hole of the dressing ring 8. Under the action of the dressing ring 8 and the sphere 12, it can rotate around its own rotation center. Sandpaper can be attached to the upper grinding disc 10 or a fixed abrasive grinding wheel can be used to grind the sphere with fixed abrasive to improve processing efficiency.

[0044] The microsphere double-plane grinding disc grinding device in this embodiment has the following specific working process: Figure 1 , Figure 2 The device is installed with the structure of the device, the driving motor is turned on to make the lower grinding disc 14 start to rotate, the peristaltic pump is started to suck up the grinding liquid, and the grinding liquid drips from the center above the lower grinding disc 14, and the dressing ring 8, the retaining frame 9 and the upper grinding disc 10 respectively rotate around their own rotation centers. The sphere 12 is driven by the upper and lower grinding discs and the retaining frame 9 to perform orbital motion, continuous spin motion and linear reciprocating motion along the retaining groove 9-1 around the center of the retaining frame 9, so that the spin angle θ of the sphere 12 can vary in a large range. At the same time, under the action of the lower grinding disc 14 with variable friction, the grinding track of the sphere 12 can fully cover the surface of the sphere 12, thereby improving the sphericity and surface quality of the processed sphere and realizing the grinding of the tiny sphere.

[0045] The grinding liquid ratio used in the test was alumina (particle size 5μm): kerosene: stearic acid = 10:100:1, the grinding pressure was 0.88N / ball, and the lower plate speed was 20rpm. Under this processing condition, the steel ball was ground for 5h. The roundness of the sphere before grinding was between 1.31μm and 2.47μm, and the roundness of the steel ball was measured using a Talyrond565 roundness meter. After grinding, it is best to reach 0.17μm. Overall, the average roundness before grinding is 1.88μm, and the average roundness after grinding drops to 0.37μm, and the roundness converges to the same value after grinding. The roundness improvement effect is obvious, and the mass of the sphere changes from 4.05mg / ball before grinding to 3.74mg / ball, a reduction of 0.31mg / ball. Compared with the traditional grinding process (under the same process conditions), the sphere obtained by this method has a higher roundness.

[0046] A microsphere double-plane grinding disc grinding method comprises the following steps:

[0047] Step 1, place the retainer 9 on the lower grinding disc 14, install the ball 12 into the retaining groove 9-1 of the retainer 9, press the upper grinding disc 10 lightly on the ball 12, and press the weight disc 11 on the upper grinding disc 10;

[0048] Step 2, put the retaining frame 9, the upper grinding disc 10 and the weight disc 11 into the dressing ring 8, and limit the dressing ring 8 with the limiting pulley 19;

[0049] Step 3, start the lower grinding disc drive mechanism 2, the lower grinding disc 14 rotates, and drives the dressing ring 8 and the retaining frame 9 to rotate. Driven by the upper grinding disc 10, the lower grinding disc 14 and the retaining frame 9, the ball 12 revolves around the center of the retaining frame 9, spins, and reciprocates along the direction of the retaining groove 9-1. The grinding liquid is continuously supplied by the grinding liquid drive pump 3 to realize the grinding action of the ball 12.

[0050] A microsphere double-plane grinding disc grinding processing device in the present embodiment has a simple and ingenious structure and is easy to process. By arranging an upper grinding disc 10, a lower grinding disc 14 and a retaining frame 9, and opening a long retaining groove 9-1 on the retaining frame 9, the ball 12 can be driven by the upper grinding disc 10, the lower grinding disc 14 and the retaining frame 9 to perform orbital motion, spin motion and reciprocating motion along the length direction of the retaining groove around the center of the retaining frame 9, so that the ball grinding trajectory can achieve full coverage of the spherical surface, ensure the grinding uniformity of the ball, and then ensure the processing sphericity of the ball, improve the use performance of the ball, and be conducive to the promotion and application of the above-mentioned processing device in the field of ball processing technology.

[0051] Embodiment 2: The characteristics that distinguish this embodiment from Embodiment 1 are as follows: a microsphere double-plane grinding disc grinding device in this embodiment, by attaching sandpaper or grinding wheel discs of matching size to the upper grinding disc 10, is equivalent to turning the upper grinding disc into a fixed abrasive grinding disc, and the grinding fluid is replaced by water or kerosene. At this time, the grinding fluid only plays the role of lubrication and cooling. The removal of the spherical material is achieved by the grinding action of the upper grinding disc 10 and the lower grinding disc 14. The grinding method is changed from the free abrasive grinding of Embodiment 1 to the fixed abrasive grinding method to grind the sphere 12, which greatly improves the grinding efficiency. When the grinding pressure is changed to 0.12N / ball grinding using the experimental conditions of Example 1, the grinding removal rate reaches 0.48mg / ball, which is faster than the removal rate of grinding using the traditional grinding process, the efficiency is improved, and the sphericity of the sphere is improved.

[0052] Example 3: Figure 5 As shown, the feature that distinguishes this embodiment from Embodiment 1 and Embodiment 2 is that the lower grinding disc 14 in this embodiment is a cast iron flat disc, and the upper grinding disc 10 is changed from a flat disc of the same material to a variable friction upper disc. Specifically, the upper grinding disc 10 has two areas with different friction coefficients, wherein the inner ring 10-1 is a fixed abrasive area, and the outer ring is a cast iron material area. Since the movement of the ball 12 in the cage groove 9-1 is a reciprocating motion from the inner ring to the outer ring, when the ball 12 passes through the junction of the inner and outer rings, the friction force suddenly changes, resulting in a sudden change in the rotation axis, and the grinding track of the ball 12 no longer repeatedly grinds the same area, so that the track reaches a full envelope, thereby realizing high-precision grinding of the ball.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0054] Although the following terms are used more frequently in this paper: 1, grinding liquid container; 2, lower grinding disc drive mechanism; 3, grinding liquid drive pump; 4, guide tube; 5, column; 6, locking nut; 7, brush; 8, dressing ring; 9, retainer; 9-1, retaining groove; 10, upper grinding disc; 11, weight disc; 12, sphere; 13, speed regulating motor; 14, lower grinding disc; 15, transmission spindle; 16, waste liquid tank; 17, frame; 18, bottom plate; 18-1, tensioning slide groove; 18-2, arc surface; 19, limit pulley; 20, transmission belt; 21, transmission wheel; 22, tension wheel; 23, gasket; 24, tension bolt, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A microsphere double-plane grinding disc grinding device, characterized in that: The invention comprises an upper grinding disc (10), a lower grinding disc (14), a lower grinding disc driving mechanism (2) for driving the lower grinding disc (14) to rotate, a dressing ring (8), an auxiliary driving mechanism and a frame (17), wherein the lower grinding disc (14) and the lower grinding disc driving mechanism (2) are mounted on the frame (17), the dressing ring (8) is mounted above the lower grinding disc (14) and is sleeved on the outside of the upper grinding disc (10), and a retaining frame (9) with a retaining groove (9-1) is also installed between the lower grinding disc (14) and the upper grinding disc (10), and the retaining frame (9) is provided with a retaining groove (9-1). The frame (9) and the upper grinding disc (10) are sleeved in the dressing ring (8), the retaining groove (9-1) is arranged in a long strip shape, and a plurality of the retaining grooves (9-1) are arranged in an array along the circumference of the retaining frame (9); the auxiliary driving mechanism comprises a base plate (18), a speed regulating motor (13), a transmission belt (20), two transmission wheels (21) and a tensioning mechanism, one of the transmission wheels (21) is mounted on the output end of the speed regulating motor (13), and the other transmission wheel (21) is rotatably mounted on the base plate (18) through a rotating shaft and is arranged in contact with the dressing ring (8) to realize The speed regulation drive of the trimming ring (8) is now described. The transmission belt (20) is connected between the two transmission wheels (21); the tensioning mechanism comprises a tensioning wheel (22), a tensioning bolt (24) and a tensioning slide groove (18-1) provided on the base plate (18); the tensioning wheel (22) is installed between the two transmission wheels (21), and the tensioning wheel (22) is respectively connected to the two transmission wheels (21) through two transmission belts (20); the tensioning wheel (22) is adjusted by adjusting the position of the tensioning bolt (24) in the tensioning slide groove (18-1). The base plate (18) has an arc surface (18-2) with the same arc as the dressing ring (8), and a limiting pulley (19) is also provided on the arc surface (18-2). The limiting pulley (19) is rotatably mounted on the base plate (18) through a rotating shaft and is arranged in contact with the dressing ring (8). Driven by the auxiliary driving mechanism, the dressing ring (8) can be driven by the transmission wheel (21) to achieve speed adjustment, thereby changing the speed of the dressing ring (8) relative to the lower grinding disc (14) to grind the ball (12).

2. A microsphere double-plane grinding disc grinding device according to claim 1, characterized in that: The upper grinding disc (10) is in the shape of a flat disc, and the lower grinding disc (14) is provided with fixed abrasive blocks (14-1), wherein two fixed abrasive blocks (14-1) are arranged diagonally.

3. A microsphere double-plane grinding disc grinding device according to claim 2, characterized in that: It also comprises a brush (7) capable of removing waste materials in the gap of the fixed abrasive block (14-1); the frame (17) is installed with a column (5); the brush (7) is installed on the column (5) and the brush head is pressed on the lower grinding disc (14).

4. The microsphere double-plane grinding disc grinding device according to claim 1, characterized in that: The invention also comprises a grinding liquid supply mechanism, which comprises a grinding liquid container (1), a conduit (4) and a grinding liquid drive pump (3), wherein the grinding liquid drive pump (3) is connected to the grinding liquid container (1) via the conduit (4).

5. The microsphere double-plane grinding disc grinding device according to claim 1, characterized in that: A weight plate (11) is placed above the upper grinding plate (10).

6. The microsphere double-plane grinding disc grinding device according to claim 1, characterized in that: The retaining frame (9) is provided with a gasket (23).

7. A microsphere double-plane grinding disc grinding method, based on a microsphere double-plane grinding disc grinding device as claimed in any one of claims 1 to 6; characterized in that: The following steps are involved: Step 1: Place the retainer (9) on the lower grinding disc (14), insert the ball (12) into the retaining groove (9-1) of the retainer (9), gently press the upper grinding disc (10) on the ball (12), and press the weight disc (11) on the upper grinding disc (10); Step 2: Put the retainer (9), the upper grinding disc (10) and the weight disc (11) into the trimming ring (8), and limit the trimming ring (8) with the limiting pulley (19); Step 3: Start The lower grinding disc driving mechanism (2) is driven, the lower grinding disc (14) rotates, and drives the dressing ring (8) and the retaining frame (9) to rotate. The ball (12) is driven by the upper grinding disc (10), the lower grinding disc (14) and the retaining frame (9) to perform a revolution motion and a spin motion around the center of the retaining frame (9) and a reciprocating motion along the direction of the retaining groove (9-1). The grinding liquid is continuously supplied by the grinding liquid driving pump (3) to achieve the grinding action of the ball (12).

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