Microsphere lapping holder and microsphere lapping assembly

Abstract

The application discloses a microsphere grinding holder and a microsphere grinding assembly. The microsphere grinding holder comprises a holder main body which is adapted to be arranged between two grinding discs; a plurality of grinding pockets are formed on the holder main body and adapted to accommodate part of the microspheres; a plurality of ball clamping grooves are formed on one side end face of the holder main body, balls are arranged in the ball clamping grooves, and part of the balls protrude from the surface of the holder and are adapted to rollingly contact one of the grinding discs. The microsphere grinding assembly comprises the above microsphere grinding holder and further comprises an upper grinding disc, a lower grinding disc and microspheres, the lower grinding disc is formed with grinding grooves; the microspheres are adapted to contact the upper grinding disc and the grinding grooves; and the upper grinding disc is adapted to drive the microspheres to revolve along the grinding grooves while rotating. The application can solve the problems of high energy dissipation rate of microsphere collision and insufficient penetration of grinding liquid in the existing grinding process, and improve the grinding quality.

Description

Technical Field

[0001] This invention relates to the field of microsphere precision grinding technology, and in particular to a microsphere grinding holder and a microsphere grinding assembly. Background Technology

[0002] The fabrication of high-precision microspherical components is a bottleneck affecting the performance of core equipment in many fields. For example, laser fusion targets, as key carriers for inertial confinement fusion experiments, require a surface sphericity error better than 0.5 micrometers. Any subsurface damage or trajectory inhomogeneity will lead to an imbalance in fusion energy scattering. In ultra-high precision aerospace engine bearings, excessive surface waviness in the ceramic rolling spheres, operating at tens of thousands of revolutions per minute, will cause stress concentration, directly threatening the 100,000-hour reliability lifespan of the Long March series rocket engines. In EUV lithography machine objective systems, nanoscale surface undulations in the precision guide spheres will distort the transmission path of extreme ultraviolet light, hindering breakthroughs in domestic lithography technology. High-precision inertial navigation gyroscope rotor spheres, artificial hip joint zirconia ball heads, and high-pressure common rail nozzle microball valves all require sub-micrometer surface accuracy and an ultra-smooth surface with Ra < 5nm.

[0003] Current grinding processes suffer from serious problems that hinder industrial development: In planetary grinding mechanisms, due to the gradient distribution of the orbital linear velocity of the spheres, high-speed spheres frequently collide with low-speed spheres. Experimental data shows that such collisions can occur hundreds of times in a single grinding cycle, leading to three core problems: ① Micro-pits and micro-cracks are generated at the collision points, evolving into subsurface damage sources in subsequent polishing; ② Random deviations in the motion trajectory disrupt the deterministic removal model, resulting in material removal rate fluctuations exceeding 30%; ③ Collision kinetic energy loss reduces grinding efficiency by more than 40%. Especially for hard and brittle materials such as silicon nitride, zirconia ceramics, and diamond, the probability of breakage caused by collisions increases exponentially with decreasing sphere diameter, resulting in a high probability of defective products in microsphere grinding.

[0004] The root cause lies in the fundamental limitations of traditional cage structures: excessive mass in metal cages exacerbates inertial collisions of the spheres, the high coefficient of friction in polymer materials hinders rotational motion, and the closed-loop isolation groove design impedes the formation of the polishing fluid flow field. Aerospace research indicates that in silicon nitride ball polishing, existing steel cages result in insufficient abrasive penetration, leading to excessive dry friction time and thermal stress deformation of the sphere surface. In artificial joint manufacturing, cages with fixed isolation hole sizes struggle to adapt to the sphere diameter gradient distribution, causing sphere compression deformation. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a microsphere grinding holder and a microsphere grinding assembly, aiming to solve the problems of high energy dissipation rate from microsphere collisions and insufficient penetration of the grinding fluid in existing grinding processes.

[0006] This invention proposes a microsphere grinding holder, which includes a holder body adapted to be disposed between two grinding discs; the holder body has a plurality of grinding pockets adapted to receive portions of microspheres; a plurality of ball grooves are formed on one end face of the holder body, and balls are disposed in the ball grooves, portions of which protrude from the surface of the holder and are adapted to roll contact with one grinding disc.

[0007] The microsphere grinding holder of the present invention achieves a transformation from traditional surface-to-surface sliding friction to ball-to-surface rolling friction between the microsphere grinding holder and the grinding disk through ball grooves and ball design. This reduces the resistance to the movement of the microsphere grinding holder when the microsphere revolves on the track, and also reduces the collision force between the microsphere and the inner surface of the grinding pocket. The grinding pocket contributes to the lightweight design of the microsphere grinding holder, and combined with the balls, avoids slippage caused by the instantaneous violent collision between the microsphere to be ground and the holder body, thus reducing (or negligibly reducing) the contact impact between the microsphere to be ground and the holder body during the stable operation phase after a period of startup. The gap design between the holder body and the grinding disk takes into account the flow path and state of the grinding fluid during the grinding process. Under the action of centrifugal force, the grinding fluid carrying grinding debris is more easily discharged outward through the gap. Furthermore, the microsphere grinding holder of the present invention can adapt to various grinding conditions and various grinding disk structures, exhibiting strong adaptability. Moreover, the microsphere grinding cage of the present invention has a simple principle and simple structure, is easy to process, assemble and operate, and has high grinding efficiency, high quality and good economic benefits.

[0008] According to some embodiments of the present invention, a guide groove is formed on the lower end face of the cage body, one end of the guide groove is connected to the grinding pocket, and the other end of the guide groove extends to the outer peripheral surface of the cage body.

[0009] According to some embodiments of the present invention, the top wall of the guide channel is constructed as an inclined surface, the angle between the inclined surface and the lower end face of the cage body is γ, and satisfies: 10°≤γ≤15°.

[0010] According to some embodiments of the present invention, the cage body is made of polymer material.

[0011] According to some embodiments of the present invention, the wall of the grinding pocket is constructed as a spherical portion.

[0012] According to some embodiments of the present invention, the spherical diameter of the grinding pocket is... d p The diameter of the microspheres is d gb And satisfy: .

[0013] According to some embodiments of the present invention, the thickness of the cage body L c The diameter of the microspheres is d gb And satisfy: .

[0014] According to some embodiments of the present invention, the radius of the ball bearing groove is r bg The radius of the ball is r b And satisfy: .

[0015] According to some embodiments of the present invention, the depth of the ball bearing groove is L bg And satisfy: .

[0016] The present invention also proposes a microsphere grinding assembly, including the aforementioned microsphere grinding holder, and further including an upper grinding disk, a lower grinding disk, and microspheres. The lower grinding disk has a grinding groove. The microsphere grinding holder is disposed between the upper grinding disk and the lower grinding disk. A portion of the microsphere is adapted to be disposed in a grinding pocket, and the microsphere protrudes from the upper and lower end faces of the holder body to facilitate contact with the upper grinding disk and the grinding groove. When the upper grinding disk rotates, it is adapted to drive the microsphere to revolve along the grinding groove while rotating on its own axis.

[0017] According to the present invention, the microsphere grinding assembly has the following technical effects due to the presence of the microsphere grinding retainer: (1) Reduced friction and collision: The microsphere grinding retainer has low frictional contact with the surface of the outer grinding disk, realizing the transformation from surface-to-surface sliding friction to ball-to-surface rolling friction between the traditional retainer and the grinding disk. The resistance of the microsphere driving the microsphere grinding retainer to move when the microsphere revolves on the track is reduced, and the collision force between the microsphere and the inner surface of the grinding pocket is also reduced; (2) Improved grinding fluid penetration efficiency: The gap design and the guide channel design fully consider the flow path and state of the grinding fluid during the grinding process. Under the action of centrifugal force, the grinding fluid with grinding debris is more easily discharged outward through the gap and the guide channel; (3) Improved rotational stability: Through the ball groove and the self-locking design of the ball, the ball rests on the shoulder. The design of the upper surface enables the microsphere grinding cage to rotate smoothly and stably, and enables the microsphere to rotate and revolve stably; (4) High adaptability: the number of microspheres being ground at the same time is controllable and highly adaptable; and the microsphere grinding cage is highly adaptable to various grinding disc structures and working conditions; (5) Lightweight structural design: the microsphere grinding cage is made of polymer material, and the design of as many grinding pockets, ball grooves and guide grooves as possible in the circumferential direction has maximized the lightweight design of the microsphere grinding cage, avoiding the contact slippage between the grinding microsphere and the microsphere grinding cage caused by the instantaneous violent collision. In the stable operation stage after a period of startup, the contact collision impact between the grinding microsphere and the microsphere grinding cage is reduced (or can be directly ignored); (6) Simple principle, simple structure, high grinding efficiency and good economic benefits.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a microsphere grinding holder according to some embodiments of the present invention; Figure 2 This is an assembly diagram of the ball and ball groove according to some embodiments of the present invention; Figure 3 This is a schematic diagram of the assembly of microspheres according to some embodiments of the present invention; Figure 4 This is a schematic diagram of the structure of a microsphere grinding assembly according to some embodiments of the present invention; Figure 5 This is a schematic diagram comparing the surface uniformity of microspheres after grinding with and without the microsphere grinding cage of the present invention.

[0020] Figure label: Microsphere grinding cage 1; cage body 11; grinding pocket 12; ball groove 13; ball 14; guide groove 15; outer peripheral surface of cage 16; Upper grinding disc 2; lower grinding disc 3; grinding groove 31; shoulder 32; microspheres 4; grinding fluid 5. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] The following is for reference. Figure 1 A microsphere grinding holder according to an embodiment of the present invention is described, with reference to Figures 2-4 A microsphere grinding assembly according to an embodiment of the present invention is described.

[0023] This invention proposes a microsphere grinding holder, which includes a holder body 11 adapted to be disposed between two grinding discs; a plurality of grinding pockets 12 are formed on the holder body 11, the grinding pockets 12 being adapted to receive portions of microspheres; a plurality of ball grooves 13 are formed on one end face of the holder body 11, and balls 14 are disposed in the ball grooves 13, portions of the balls 14 protruding from the surface of the holder and adapted to roll contact with one of the grinding discs.

[0024] The microsphere grinding holder according to the present invention is suitable for placement between two grinding discs, and can constrain and limit the microspheres. By providing grinding pockets 12 to accommodate the microspheres to be ground, the microspheres can be separated from each other, avoiding collisions during the grinding process, and reducing the structural weight of the microsphere grinding holder. Under normal service conditions, under the gravity of the holder body 11, the upper surface of the grinding pockets 12 contacts the microspheres, so that there is a certain distance between the holder body 11 and the two grinding discs. Furthermore, by providing ball bearing grooves 13 and cooperating with balls 14... The structure contacts the grinding disc and supports the main body 11 of the holder, enabling low-friction contact between the microsphere grinding holder and the grinding disc surface. This achieves a transformation from traditional surface-to-surface sliding friction to ball-to-surface rolling friction, effectively improving the orbital stability of the microsphere grinding holder and indirectly improving the grinding stability of the microspheres. Furthermore, it maintains a certain gap between the main body 11 of the holder and the grinding disc, providing space and a path for the grinding fluid to flow out of the grinding disc, facilitating the penetration and flow of the grinding fluid, and allowing the grinding fluid to smoothly carry away the grinding debris, avoiding secondary damage to the surface of the microspheres caused by the grinding debris.

[0025] According to the microsphere grinding holder of the present invention, the design of the ball groove 13 and the ball 14 realizes the transformation from traditional surface-to-surface sliding friction to ball-to-surface rolling friction between the microsphere grinding holder and the grinding disk. This reduces the resistance of the microsphere driving the microsphere grinding holder to move when the microsphere revolves on the track, and also reduces the collision force between the microsphere and the inner surface of the grinding pocket 12. The grinding pocket 12 realizes the lightweight design of the microsphere grinding holder to a certain extent. Combined with the ball 14, it can avoid the slippage caused by the instantaneous violent collision between the microsphere to be ground and the holder body 11 and the plane contact with the grinding disk. In the stable operation stage after a period of start-up operation, the contact collision impact between the microsphere to be ground and the holder body 11 can be reduced (or directly ignored). The gap design between the holder body 11 and the grinding disk takes into account the flow path and state of the grinding fluid during the grinding process. Under the action of centrifugal force, the grinding fluid carrying grinding debris is more easily discharged outward through the gap.

[0026] Furthermore, the microsphere grinding holder of the present invention can adapt to various grinding conditions and grinding disc structures, such as grooved eccentric grinding discs, shaft eccentric grinding discs, grinding discs with V-grooves on the upper grinding disc, and different V-groove half-angle sizes, etc., demonstrating strong adaptability. Moreover, the microsphere grinding holder of the present invention has a simple principle and simple structure, is easy to process, assemble and operate, and has high grinding efficiency, high quality, and good economic benefits.

[0027] In some embodiments, such as Figure 1 As shown, the cage body 11 is constructed as a ring structure that matches the orbital path of the microspheres, and the grinding pockets 12 are spaced apart along the circumferential direction, with a bridging area formed between adjacent grinding pockets 12. In some embodiments, the plurality of grinding pockets 12 are evenly spaced.

[0028] Furthermore, the ball bearing groove 13 is formed in the bridge area, such as Figure 1 As shown, ball bearing grooves 13 are formed in portions of multiple bridge areas, and the ball bearing grooves 13 are evenly spaced along the circumference. Furthermore, as... Figure 1 , Figure 2 As shown, in one bridge section, the ball bearing groove 13 is constructed as two, located at the center of the bridge material between the grinding pockets 12, and is radially symmetrically arranged relative to the evenly distributed circumference of the grinding pockets 12 to improve the stability of the force.

[0029] Specifically, the number of grinding pockets 12 can be determined by referring to the maximum diameter of the grinding disc and the cage body 11. While ensuring sufficient space in the bridge area between the grinding pockets 12 to guarantee sufficient strength for service and sufficient space for the ball bearing grooves 13, a maximum number of grinding pockets 12 can be prefabricated to reduce the material of the cage body 11, achieving overall cage lightweighting. This further reduces the revolution resistance of the microspheres during grinding, lowers or negligibles the contact and collision force with the inner surface of the grinding pockets 12, and ultimately improves the grinding quality of the microsphere surface. By increasing the number of prefabricated grinding pockets 12, more microspheres can be ground simultaneously. Furthermore, the number of microspheres to be ground simultaneously can be selected according to needs during grinding; they can be fully filled or evenly distributed at intervals, offering strong adaptability and accommodating various numbers of microspheres for simultaneous grinding.

[0030] The specific number of ball bearing slots 13 can also be determined by referring to the size of the grinding disc and the cage body 11.

[0031] According to some embodiments of the present invention, a guide groove 15 is formed on the lower end face of the cage body 11. One end of the guide groove 15 communicates with the grinding pocket 12, and the other end of the guide groove 15 extends to the outer peripheral surface of the cage body 11. In this embodiment, as shown... Figure 3 As shown, the grinding slurry 5, under the action of centrifugal force, is thrown through the gap between the microsphere 4 to be ground and the grinding pocket 12 into the guide channel 15, and continues to be discharged outward along the guide channel 15 due to the centrifugal force and the continuous pushing action of the subsequent grinding slurry 5. This embodiment fully considers the flow path and state of the grinding slurry 5 during the grinding process. By setting the guide channel 15, it can play a guiding role. Under the action of rotational centrifugal force, the grinding slurry 5 carrying grinding debris is more easily discharged outward through the gap and the guide channel 15 to the outer peripheral surface 16 of the retainer, which promotes the guiding grinding slurry 5 to flow out of the microsphere grinding retainer, and then discharged through the grinding disc to the device for collecting the grinding slurry 5; it can achieve a further chip removal effect, avoid secondary damage to the surface of the microsphere 4 by grinding debris, and improve the surface finish. Furthermore, the guide channel 15 is constructed to have multiple channels, the same number as the grinding pocket 12, which are connected to the grinding pocket 12 one by one.

[0032] According to some embodiments of the present invention, the top wall of the guide channel 15 is constructed as an inclined surface, and the angle between the inclined surface and the lower end face of the retainer body 11 is γ, satisfying 10°≤γ≤15°. In this embodiment, the guide channel 15 is formed as an inclined surface, and the overall shape is radially higher on the inner side and lower on the outer side, which helps the polishing fluid 5 to flow out and can improve the guiding effect.

[0033] According to some embodiments of the present invention, the cage body 11 is made of a polymer material. In this embodiment, using a polymer material to make the cage body 11 can reduce the weight of the cage body 11, reduce the friction between the cage body 11 and the microspheres 4, and at the same time give the cage body 11 a certain self-lubricating effect. Polymer materials have the advantages of light weight, low friction, and self-lubrication, and can specifically be nylon (PA66, PA46), polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), etc.

[0034] According to some embodiments of the present invention, the wall structure of the grinding pocket 12 is a spherical portion. In this embodiment, the inner surface of the grinding pocket 12 is spherical, conforming to the spherical arc of the microsphere 4, so that when the inner surface of the grinding pocket 12 contacts the microsphere 4, it is a line contact or a surface contact, which can reduce contact stress and contact pressure.

[0035] According to some embodiments of the present invention, the spherical diameter of the grinding pocket 12 is... d p The diameter of microsphere 4 is d gb And satisfy: .

[0036] In this embodiment, as Figure 3 As shown, the diameter of the grinding pocket 12 should be fully referenced to the diameter of the microsphere 4 to be ground, and should not be too large or too small. If the diameter of the grinding pocket 12 is too large, the microsphere 4 will experience a sudden and violent lateral movement within the restricted area of ​​the grinding pocket 12 during service, or violently collide with the inner surface of the grinding pocket 12, resulting in a sudden change in the contact force between the microsphere 4 and the grinding disc, and a decrease in the surface quality of the microsphere 4. If the diameter of the grinding pocket 12 is too small, problems such as the microsphere 4 getting stuck are likely to occur. In this embodiment, the ratio of the spherical diameter of the grinding pocket 12 to the diameter of the microsphere 4 is limited to the above range, which can ensure that the microsphere 4 rotates stably during service and improve the grinding quality.

[0037] According to some embodiments of the present invention, the thickness of the cage body 11 L c The diameter of microsphere 4 is d gb And satisfy: In this embodiment, as Figure 3 As shown, the ratio of the thickness of the cage body 11 to the diameter of the microsphere 4 is limited to the above range, which can optimize the grinding effect.

[0038] In some embodiments, such as Figure 2 , Figure 3 As shown, the depth of the ball bearing groove 13 is L bg And satisfy: This ensures that the ball bearing 14 has a certain service stability and the overall cage has impact resistance strength.

[0039] According to some embodiments of the present invention, the radius of the ball bearing groove 13 is r bg The radius of ball bearing 14 is r b And satisfy: In this embodiment, as Figure 2 As shown, the ratio of the radius of the ball groove 13 to the radius of the ball 14 is limited to the above range, which allows the ball groove 13 to accommodate the ball 14 while ensuring that the ball 14 does not generate large vibrations within the ball groove 13, thus enabling stable operation.

[0040] In some embodiments, the ball bearing 14 may be made of a material with high hardness and low coefficient of friction, such as ceramic.

[0041] According to some embodiments of the present invention, the radius of the ball bearing groove 13 is r bg The depth of the ball bearing groove 13 is L bg And satisfy: In this embodiment, as Figure 2 As shown, the ratio of the depth to the radius of the ball groove 13 is limited to the above range, which allows the radius of the opening circle of the ball groove 13 to be... r' bg Approximately 0.83 to 0.86 times the maximum radial dimension of ball bearing 14. r b ,Right now This allows for self-locking of the ball 14 during its movement; moreover, the protruding "claw"-shaped structure at the opening of the ball groove 13 can "scrape" away larger abrasive materials brought by the grinding fluid 5 outside the ball groove 13, ensuring that there are relatively no foreign objects inside the ball groove 13, resulting in less rolling resistance for the ball 14 and smoother overall operation.

[0042] In combination with the above embodiments, such as Figure 2 , Figure 3 As shown, a better grinding effect can be obtained when the ball bearing groove 13 and the ball 14 meet the following dimensional relationship conditions:

[0043]

[0044]

[0045]

[0046] The above relationship applies to the fit of all ball grooves 13 and balls 14 that are circumferentially distributed on the lower end face of the cage body 11.

[0047] like Figure 2-4 As shown, the present invention also proposes a microsphere grinding assembly, which includes the aforementioned microsphere grinding holder 1, an upper grinding disk 2, a lower grinding disk 3, and microspheres 4 to be ground. The lower grinding disk 3 has a grinding groove 31. The microsphere grinding holder 1 is disposed between the upper grinding disk 2 and the lower grinding disk 3. A portion of the microspheres 4 to be ground is adapted to be disposed in the grinding pocket 12. The microspheres 4 protrude from the upper and lower end faces of the holder body 11 to facilitate contact with the upper grinding disk 2 and the grinding groove 31. When the upper grinding disk 2 rotates, it is adapted to drive the microspheres 4 to revolve around the grinding groove 31 while rotating on their own axis.

[0048] According to the microsphere grinding assembly of the present invention, a microsphere grinding holder 1 is disposed between an upper grinding disk 2 and a lower grinding disk 3. The lower grinding disk 3 has a grinding groove 31. The microsphere 4 to be ground contacts the upper grinding disk 2 and the lower grinding disk 3, is placed in the grinding groove 31, and is partially received in the grinding pocket 12. The grinding pocket 12 of the microsphere grinding holder 1 and the grinding groove 31 are axially aligned. The microsphere grinding holder 1 can constrain the displacement and velocity of the microsphere 4 to be ground, so that it can rotate stably for grinding. The inner surface of the grinding pocket 12 of the grinding cage 1 contacts the microsphere 4 to be ground by gravity. The ball bearing 14 is installed in the ball bearing groove 13 of the cage body 11, that is, the cage body 11 and the ball bearing 14 are integrated. The ball bearing 14 is supported on the upper surface shoulder 32 on both sides of the grinding groove 31 on the lower grinding disk 3. With the self-locking design of the ball bearing groove 13 and the ball bearing 14, and the design of the ball bearing 14 resting on the shoulder of the lower grinding disk 3, the cage body 11 can rotate smoothly and stably under the guidance of the upper grinding disk 2 and the microsphere 4.

[0049] During the grinding process, the upper grinding disc 2 and the lower grinding disc 3 are brought into close contact with the microspheres 4 to be ground by applying pressure. When the upper grinding disc 2 or the lower grinding disc 3 is driven, the microspheres 4 rotate and revolve in the grinding groove 31, repeating several grinding cycles. At the same time, the microsphere grinding holder 1 separates the microspheres 4 to be ground between the upper grinding disc 2 and the lower grinding disc 3, and rotates due to the grinding effect of the microspheres 4. At this time, the microsphere grinding holder 1 rolls and rubs against the lower grinding disc 3 through the ball bearing groove 13, and revolves circumferentially.

[0050] Furthermore, during the grinding process, grinding fluid 5 is continuously supplied between the upper grinding disc 2 and the lower grinding disc 3 to assist grinding and improve removal efficiency; the grinding fluid 5 is finally discharged to the outside through the gap between the holder body 11 and the lower grinding disc 3 and the guide groove 15. At the same time, during the grinding process, the grinding fluid 5 can provide a certain normal support force to help support the microsphere grinding holder 1.

[0051] It should be noted that when the orbital circumference of the microsphere 4 is a circle centered on the rotation center of the upper grinding disc 2 or the lower grinding disc 3, the lateral rolling friction is insufficient, the movement trajectory of the microsphere 4 is singular, and it is easy to roll along a fixed circumference, resulting in uneven surface grinding. To address this problem, the orbital path of the microsphere 4 needs to be eccentrically set, that is, the grinding groove 31 needs to be eccentrically set. When the microsphere 4 rolls in the eccentric grinding groove 31, there are generally multiple microspheres on the track at the same time, and the orbital speed at any position is not constant. The microsphere grinding holder 1 of this invention can avoid collisions of the microsphere 4 through displacement constraints and velocity constraints, so that the microsphere 4 can maintain stable contact during rapid acceleration and deceleration, thereby achieving uniform and stable grinding and a stable removal rate.

[0052] According to the present invention, the microsphere grinding assembly has the following technical effects due to the presence of the microsphere grinding retainer 1: (1) Reduced friction and collision: The microsphere grinding retainer 1 has low frictional contact with the surface of the outer grinding disk, realizing the transformation from surface-to-surface sliding friction to ball-to-surface rolling friction between the traditional retainer and the grinding disk. The resistance of the microsphere 4 driving the microsphere grinding retainer 1 to move when it revolves on the track is reduced, and the collision force between the microsphere 4 and the inner surface of the grinding pocket 12 is also reduced; (2) Improved grinding fluid penetration efficiency: The gap design and the design of the guide groove 15 fully consider the flow path and state of the grinding fluid during the grinding process. Under the action of centrifugal force, the grinding fluid 5 carrying grinding debris is more easily discharged outward through the gap and the guide groove 15; (3) Improved rotational stability: Through the self-locking design of the ball groove 13 and the ball 14, the ball 14 rests on the shoulder. The design of the upper surface of 32 enables the smooth and stable rotation of the microsphere grinding holder 1 and the stable rotation and revolution of the microsphere 4; (4) High adaptability: the number of microspheres 4 being ground simultaneously is controllable, and the adaptability is high; and the microsphere grinding holder 1 is highly adaptable to various grinding disc structures and working conditions; (5) Lightweight structural design: the microsphere grinding holder 1 is made of polymer material, and the design of as many grinding pockets 12, ball grooves 13, and guide grooves 15 as possible in the circumferential direction realizes the lightweight design of the microsphere grinding holder 1 as much as possible, avoiding the contact slippage between the grinding microsphere 4 and the microsphere grinding holder 1 caused by the instantaneous violent collision. In the stable operation stage after a period of startup, the contact collision impact between the grinding microsphere 4 and the microsphere grinding holder 1 is reduced (or can be directly ignored); (6) Simple principle, simple structure, high grinding efficiency, and good economic benefits. This invention can reduce the inertial collision of the microsphere 4 and improve the grinding quality of the microsphere 4, meeting the technical requirements of the user for high microsphere surface quality.

[0053] In some embodiments, the upper grinding disc 2 and the lower grinding disc 3 are generally made of cast iron, and the lower surface of the upper grinding disc 2 is a single cast iron plane.

[0054] In some embodiments, the grinding groove 31 is constructed as a V-shaped groove, with shoulders 32 formed on both sides of the V-shaped groove. During the grinding process, the microspheres 4 to be ground are always within the V-shaped groove. When the upper grinding disk 2 and the lower grinding disk 3 are driven, the microspheres 4 begin to rotate and revolve within the V-shaped groove. The grinding groove 31 can also be constructed as an annular closed groove. The balls 14 of the microsphere grinding holder 1 contact the shoulders 32 on the upper surfaces of the V-shaped groove on both sides of the lower grinding disk 3, and their movement is supported and guided by the shoulders 32.

[0055] Furthermore, such as Figure 3 As shown, the V-groove includes half-angles α and β, which are generally equal in size; however, the specific angle can be determined based on the degree of eccentricity of the grinding track, the size of the microsphere 4, and the grinding conditions. Furthermore, if the half-angle α of the V-groove designed according to the working conditions is increased, in order to ensure that the ball 14 still rests on the shoulder 32 of the upper surface, the radial distance of the ball groove 13 along the circumference can be appropriately increased, and the radial width of the annulus of the cage body 11 can be increased accordingly.

[0056] The upper part of the upper grinding disk 2 and the lower part of the lower grinding disk 3 of the microsphere grinding assembly of the present invention are suitable for assembly with other grinding mechanisms, such as loading systems, drive systems, control systems, monitoring and acquisition systems, and other grinding machine main structure tooling, etc.

[0057] A grinding test was conducted using the microsphere grinding holder and microsphere grinding assembly according to the present invention. The results of the comparison of microsphere surface uniformity (SD value) after grinding with and without the microsphere grinding holder 1 are as follows: Figure 5 As shown, the lower the SD value, the better the surface grinding uniformity of the microspheres. Figure 5 The comparison shows that the microsphere grinding holder and microsphere grinding assembly developed using the present invention have significant advantages in improving grinding quality.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 limitations on this invention.

[0059] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0060] In the description of this invention, "a plurality of" means two or more.

[0061] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0062] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A microsphere grinding holder, characterized in that, include: A cage body, the cage body being adapted to be disposed between two grinding discs; The main body of the retainer has a plurality of grinding pockets, which are adapted to accommodate the portion of the microspheres; The cage body has a plurality of ball grooves formed on one end face, and balls are provided in the ball grooves. Part of the balls protrudes from the surface of the cage and is adapted to roll into contact with a grinding disc. By setting ball bearing grooves and cooperating with the ball bearing structure to contact the grinding disc, the main body of the cage can be supported, so that the microsphere grinding cage and the surface of the grinding disc can be in low-friction contact. This realizes the transformation of the microsphere grinding cage and the grinding disc from traditional surface-to-surface sliding friction to ball-to-surface rolling friction. It also keeps a certain gap between the main body of the cage and the grinding disc, leaving space and path for the grinding fluid to flow out of the grinding disc, so that the grinding fluid can smoothly carry away the grinding debris. A guide groove is formed on the lower end face of the cage body. One end of the guide groove is connected to the grinding pocket, and the other end of the guide groove extends to the outer peripheral surface of the cage body. The top wall of the guide channel is constructed as an inclined surface, and the angle between the inclined surface and the lower end face of the cage body is γ, satisfying 10°≤γ≤15°; The radius of the ball bearing groove is r bg The depth of the ball bearing groove is L bg And satisfy: The ratio of the ball groove depth to the ball groove radius is limited to the above range, which allows the radius of the ball groove opening circle to be controlled. r' bg= 0.83~0.86 times the maximum radial dimension of the ball. r b ,Right now It can achieve self-locking during the ball's movement; The protruding "claw"-shaped structure at the opening of the ball bearing groove also "scrapes" away the larger abrasive materials brought by the grinding fluid outside the ball bearing groove. The radius of the ball satisfies ; The depth of the ball bearing groove and the thickness of the cage body Lc satisfy .

2. The microsphere grinding holder according to claim 1, characterized in that, The cage body is made of polymer material.

3. The microsphere grinding holder according to claim 1, characterized in that, The wall structure of the grinding pocket is a spherical part.

4. The microsphere grinding holder according to claim 3, characterized in that, The spherical diameter of the grinding pocket is d p The diameter of the microspheres is d gb And satisfy .

5. The microsphere grinding holder according to claim 1, characterized in that, The thickness of the cage body L c The diameter of the microspheres is d gb And satisfy .

6. A microsphere grinding assembly, characterized in that, The microsphere grinding holder as described in any one of claims 1-5 further includes: An upper grinding disc and a lower grinding disc, wherein the lower grinding disc is formed with a grinding groove; The microsphere grinding holder is disposed between the upper grinding disk and the lower grinding disk; Microspheres, a portion of which are adapted to be disposed within the grinding pocket, protruding from the upper and lower end faces of the holder body to be adapted to contact the upper grinding disc and the grinding groove; When the upper grinding disc rotates, it is adapted to drive the microspheres to revolve around the grinding groove while simultaneously rotating on their own axis.

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