Double-tray sphere inner and outer track circulating grinding device and method integrating magnetic suspension abrasive particles

Abstract

The invention belongs to the field of ultra-precision machining of spheres, and particularly relates to a double-tray sphere inner and outer track circulating grinding device and method integrating magnetic suspension abrasive particles. According to the technical scheme, the device comprises a grinding disc, a flat disc, a left material disc, a right material disc, a magnetic disc and magnetic composite abrasive particles, the grinding face of the grinding disc is provided with an inner grinding track area and an outer grinding track area, and the flat disc is provided with an inner track ball inlet hole, an inner track ball outlet hole, an outer track ball inlet hole and an outer track ball outlet hole; the left charging tray is connected with the outer rail ball inlet hole through a left ball inlet sliding rail, the left ball outlet sliding rail is connected with the inner rail ball outlet hole, the right charging tray is connected with the inner rail ball inlet hole through a right ball inlet sliding rail, and the right ball outlet sliding rail is connected with the outer rail ball outlet hole; the flat disc is opposite to the grinding surface of the grinding disc, and magnetic composite grinding particles are placed between the flat disc and the grinding disc; the magnetic disc is arranged on the back face of the grinding disc. According to the invention, the grinding envelope areas of the same batch of balls are highly consistent, and the sphericity uniformity of the same batch of products is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of sphere ultra-precision machining, and particularly relates to a double-disk ball inner and outer track circulating grinding device and method integrated with magnetic suspension abrasive particles. BACKGROUND

[0002] In the field of ceramic sphere ultra-precision machining, the traditional concentric V-shaped groove grinding method causes the sphere self-rotation angle to be constant due to the fixed groove curvature, and the grinding track only covers less than 30% of the sphere surface (concentrated in three concentric circular rings), which causes uneven material removal, poor batch consistency (the sphere error fluctuation of the same batch is more than 0.3 μm), and low processing efficiency, and the like. To improve the track uniformity, the variable curvature groove technology realizes the continuous dynamic change of the sphere self-rotation angle from 0° to 180° through the eccentric equidistant spiral line design, and realizes the full envelope of the sphere track in a single cycle. However, this technology still has significant defects: in the multi-sphere parallel machining, the motion interference between the spheres causes the track to be disordered, especially in the high-hardness silicon nitride ceramic (Vickers hardness ≥ 15 GPa) machining. At the same time, the existing single-disk circulating system cannot realize the periodic and orderly switching of the inner and outer grinding tracks of the sphere, which causes the cumulative grinding amount of different regions of the sphere surface to be significantly different, and the sphere is easy to cause surface damage due to collision during the feeding and discharging process. In addition, the high-hard and brittle characteristics of silicon nitride make the variable curvature groove machining face the efficiency bottleneck of more than 40% reduction in material removal rate compared with bearing steel balls, and the subsequent magnetorheological polishing can realize the nanometer surface roughness (Ra≤5 nm) and G5 level sphere (error ≤0.12 μm), but the global surface envelope polishing device is high in cost, and it is difficult to coordinate with the process parameters of the previous grinding link, which restricts the overall processing efficiency. In the existing improvement scheme, reducing the speed to suppress vibration will sacrifice the processing efficiency (the precision grinding speed needs to be limited below 20 rpm), and the nitrogen nitride special processing needs to introduce additional wear equation modeling and groove optimization, which further increases the process complexity.

[0003] In view of the technical bottleneck of complex structure and low efficiency of the circulating mechanism of the vertical ball grinder, a horizontal layout scheme is innovatively adopted. The circulating mechanism cooperatively controls the double feeders and the upper and lower ball tracks to significantly simplify the mechanical structure and improve the installation convenience. Meanwhile, relying on the closed-loop conveying path, the ball is sequentially switched between the inner and outer grinding tracks to improve the circulating efficiency. In the horizontal ball grinder, the driving mechanism drives the grinding disc to rotate, the pressing mechanism applies load to the flat disc, and the ball is processed through the interaction between the grinding disc and the flat disc. Although this structure has the advantages of large ball loading capacity and convenient circulating grinding, and the circulating mechanism has a significantly improved efficiency compared with the vertical structure, the existing circulating system has a fundamental defect. After the processed ball flows out of the circulating system through the ball outlet, the ball flows into the grinding area through the ball inlet, but there is no accurate track switching control mechanism, which causes the flow cycle of the ball between the inner and outer grinding tracks to be inconsistent. This circulating disorder causes random differences in the actual grinding travel of the same batch of balls, which further causes the dispersion of the equal cutting probability distribution to be too large, which seriously restricts the ultra-precision machining requirements of high consistency ceramic balls. SUMMARY

[0004] The application provides a double-feeder ball inner and outer track circulating grinding device and method integrated with magnetic suspension abrasive particles, which can ensure that the same batch of balls experiences a highly consistent grinding envelope area, significantly improves the equal cutting probability, and guarantees the uniformity of the sphericity of the same batch of products.

[0005] The technical scheme of the application is as follows:

[0006] The double-feeder ball inner and outer track circulating grinding device integrated with magnetic suspension abrasive particles comprises a grinding disc, a flat disc, a left feeder, a right feeder, a magnetic disc, and magnetic composite abrasive particles. The grinding surface of the grinding disc is provided with an inner grinding track area and an outer grinding track area. The flat disc is provided with an inner track ball inlet hole, an inner track ball outlet hole, an outer track ball inlet hole, and an outer track ball outlet hole. The inner track ball inlet hole and the inner track ball outlet hole correspond in position to the inner grinding track area, and the outer track ball inlet hole and the outer track ball outlet hole correspond in position to the outer grinding track area. The left feeder is connected to the outer track ball inlet hole through a left ball inlet sliding rail and connected to the inner track ball outlet hole through a left ball outlet sliding rail, and the right feeder is connected to the inner track ball inlet hole through a right ball inlet sliding rail and connected to the outer track ball outlet hole through a right ball outlet sliding rail. The flat disc is arranged opposite to the grinding surface of the grinding disc, and the magnetic composite abrasive particles are placed between the flat disc and the grinding disc. The magnetic disc is arranged on the back surface of the grinding disc.

[0007] Further, the double-feeder ball inner and outer track circulating grinding device integrated with magnetic suspension abrasive particles comprises a plurality of tracks in the inner grinding track area, each track adopts a plurality of circular arc splicing structures, and the circumferences of the tracks are equal. The double-feeder ball inner and outer track circulating grinding device integrated with magnetic suspension abrasive particles comprises a plurality of tracks in the outer grinding track area, each track adopts a plurality of circular arc splicing structures, and the circumferences of the tracks are equal.

[0008] Further, the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device, the magnetic disk is provided with annular inner magnetic area and outer magnetic area, the inner magnetic area corresponds to the inner grinding track area position, the outer magnetic area corresponds to the outer grinding track area position.

[0009] Further, the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device, the inner magnetic area and the outer magnetic area are both annular arrays of permanent magnets with N and S poles alternatingly distributed.

[0010] Further, the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device, the grinding disk is prepared from alumina-silicon carbide composite ceramic and is a non-magnetic material.

[0011] Further, the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device, the bottom of the left disk and the right disk is provided with a rotating disc, the rotating disc is driven by a motor and provides power for the circulation of the sphere.

[0012] Further, the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device, the left ball inlet slide rail, the left ball outlet slide rail, the right ball inlet slide rail and the right ball outlet slide rail are all paved with a conveyor belt, and the conveyor belt is driven by a motor.

[0013] Further, the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device, the left disk is provided with a ball inlet port one, a ball outlet port one and a first baffle, the ball inlet port one is connected with the left ball outlet slide rail, the ball outlet port one is connected with the left ball inlet slide rail, and the first baffle is arranged on the left disk and one end thereof is located between the ball inlet port one and the ball outlet port one; the right disk is provided with a ball inlet port two, a ball outlet port two and a second baffle, the ball inlet port two is connected with the right ball outlet slide rail, the ball outlet port two is connected with the right ball inlet slide rail, and the second baffle is arranged on the right disk and one end thereof is located between the ball inlet port two and the ball outlet port two.

[0014] The integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding method utilizes the integrated magnetic suspension grinding particle double-disk spherical inner and outer track circulating grinding device and comprises the following steps:

[0015] 1) connecting the grinding disk and the magnetic disk with the driving mechanism of the horizontal ball grinding machine, and connecting the flat disk with the pressurizing mechanism of the horizontal ball grinding machine;

[0016] 2) starting the motor to drive the rotating disc to rotate, so that the balls in the left disk are transported to the grinding disk through the left ball inlet slide rail and the outer track ball inlet hole;

[0017] 3) starting the driving mechanism of the horizontal ball grinding machine to drive the grinding disk and the magnetic disk to rotate, starting the pressurizing mechanism of the horizontal ball grinding machine to pressurize the flat disk, and performing the grinding processing of the balls; the magnetic disk drives the magnetic composite grinding particles to be in a suspended state.

[0018] 4) the ball ground by the outer grinding track area, from the ball outlet hole of the outer track, enters the right material tray through the right ball outlet slide rail; then the ball is ground by the rotation of the rotating disc, and enters the inner grinding track area through the right ball inlet slide rail and the ball inlet hole of the inner track;

[0019] 5) the ball ground by the inner grinding track area, from the ball outlet hole of the inner track, enters the left material tray through the left ball outlet slide rail;

[0020] 6) after the ball is ground once in the inner grinding track area and the outer grinding track area, one grinding cycle is completed;

[0021] 7) the above steps 2)-6) are cycled, and the ball is taken out when it reaches the qualified standard.

[0022] The beneficial effects of the present application are:

[0023] 1) the present application constructs a closed loop circulation path through the closed loop butt joint of the left and right material trays and the ball inlet and outlet holes of the flat disc, and realizes the topological structure of constant outer track circumference and constant inner track circumference by using the variable curvature track characteristics of arc splicing, and realizes the orderly and alternative flow of the ball between the inner and outer grinding tracks by combining the timing control of the stop block and the power driving of the rotating disc.

[0024] 2) the gradient magnetic field formed by the alternating magnetic poles acts on the track area, so that the magnetic abrasive particles are separated from the surface of the grinding disc to form a uniform suspension layer, and the accumulation of abrasive particles does not occur, and a uniform grinding effect is obtained.

[0025] 3) the compact structure layout of the present application effectively eliminates the randomness of track switching of the traditional circulation system, ensures that the grinding envelope area of the same batch of balls is consistent, and significantly improves the uniformity of sphericity and equal cutting probability. The present application replaces the probabilistic track switching mode with a deterministic flow mechanism, so that the ball accurately enters the target grinding track according to the preset path, and the process complexity is reduced while the ultra-precision machining quality control is realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of a double-material-tray ball inner and outer track circulation grinding device integrated with magnetic suspension abrasive particles;

[0027] Figure 2 It is a front view of a double-material-tray ball inner and outer track circulation grinding device integrated with magnetic suspension abrasive particles;

[0028] Figure 3 It is a schematic diagram of a left material tray;

[0029] Figure 4 It is a schematic diagram of a right material tray;

[0030] Figure 5 It is a schematic diagram of the grinding surface of the grinding disc;

[0031] Figure 6 This is a diagram of a disk.

[0032] Figure 7 This is a diagram of a flat plate;

[0033] Figure 8 A schematic diagram of a dual-disc sphere internal and external track circulating grinding device for integrating magnetically levitated abrasive particles installed on a horizontal sphere grinding machine. Detailed Implementation

[0034] like Figures 1-7 As shown, the dual-disc sphere internal and external track circulating grinding device integrating magnetic levitation abrasives includes a grinding disk 2, a flat disk 1, a left material disk 8, a right material disk 14, a magnetic disk 19, and magnetic composite abrasives. The grinding surface of the grinding disk 2 is provided with an inner grinding track area 20 and an outer grinding track area 21. The flat disk 1 is provided with an inner track ball inlet hole 4, an inner track ball outlet hole 10, an outer track ball inlet hole 3, and an outer track ball outlet hole 9. The inner track ball inlet hole 4 and the inner track ball outlet hole 10 correspond to the positions of the inner grinding track area 20, and the outer track ball inlet hole 3 and the outer track ball outlet hole 9 correspond to the positions of the inner track ball inlet hole 4 and the inner track ball outlet hole 10. The outer rail ball outlet hole 9 corresponds to the position of the outer grinding track area 21; the left material tray 8 is connected to the outer rail ball outlet hole 3 through the left ball outlet slide rail 5 and the left ball outlet slide rail 6 is connected to the inner rail ball outlet hole 10; the right material tray 14 is connected to the inner rail ball outlet hole 4 through the right ball outlet slide rail 12 and the right ball outlet slide rail 11 is connected to the outer rail ball outlet hole 9; the grinding surfaces of the flat plate 1 and the grinding disk 2 are arranged opposite each other, and magnetic composite abrasive particles are placed between the flat plate 1 and the grinding disk 2; the disk 19 is arranged on the back of the grinding disk 2.

[0035] The inner grinding track area 20 includes three tracks, each of which adopts a multi-arc splicing structure. The curvature of the arc of the inner track is greater than that of the arc of the outer track, and the circumference of the three tracks is equal. The outer grinding track area 21 includes three tracks, each of which adopts a multi-arc splicing structure. The curvature of the arc of the inner track is greater than that of the arc of the outer track, and the circumference of the three tracks is equal.

[0036] The disk 19 has an annular inner magnetic area 22 and an outer magnetic area 23. The inner magnetic area 22 corresponds to the inner grinding track area 20, and the outer magnetic area 23 corresponds to the outer grinding track area 21. Both the inner magnetic area 22 and the outer magnetic area 23 are annular arrays of permanent magnets with alternating N and S poles.

[0037] The grinding disc 2 is made of alumina-silicon carbide composite ceramic and is a non-magnetic material.

[0038] Both the bottom of the left material tray 8 and the right material tray 14 are equipped with a rotating disc, which is driven by a motor to provide power for the circulation of the sphere.

[0039] The left ball-scoring slide rail 5, the left ball-ejecting slide rail 6, the right ball-scoring slide rail 12, and the right ball-ejecting slide rail 11 are all equipped with conveyor belts, which are all driven by motors.

[0040] The left material tray 8 is provided with a ball inlet 16, a ball outlet 15 and a first baffle 7. The ball inlet 16 is connected to the left ball outlet slide rail 6 and the ball outlet 15 is connected to the left ball inlet slide rail 5. The first baffle 7 is set on the left material tray 8 and one end of it is located between the ball inlet 16 and the ball outlet 1. The right material tray 14 is provided with a ball inlet 2 17, a ball outlet 2 18 and a second baffle 13. The ball inlet 2 17 is connected to the right ball outlet slide rail 11 and the ball outlet 2 18 is connected to the right ball inlet slide rail 12. The second baffle 13 is set on the right material tray 14 and one end of it is located between the ball inlet 2 17 and the ball outlet 2 18.

[0041] A method for cyclic grinding of a dual-disc sphere with integrated magnetic levitation abrasive particles via internal and external tracks, utilizing the aforementioned cyclic grinding device for a dual-disc sphere with integrated magnetic levitation abrasive particles via internal and external tracks, includes the following steps:

[0042] 1) such as Figure 8 As shown, the grinding disc 2 and the disk 19 are connected to the drive mechanism 24 of the horizontal ball grinding machine, and the flat disc 1 is connected to the pressure mechanism 25 of the horizontal ball grinding machine.

[0043] 2) Turn on the motor to drive the rotary table to rotate, so that the balls in the left material tray 8 are conveyed into the grinding tray 2 through the left ball-in slide rail 5 and the outer rail ball-in hole 3;

[0044] 3) Turn on the drive mechanism 24 of the horizontal ball grinding machine to drive the grinding disc 2 and the disk 19 to rotate; turn on the pressure mechanism 25 of the horizontal ball grinding machine to apply pressure to the flat disc 1 to perform ball grinding; the disk 19 drives the magnetic composite abrasive particles to be in a suspended state.

[0045] 4) The ball, after being ground in the outer grinding track area 21, enters the right material tray 14 through the outer track ball outlet hole 9 and the right ball outlet slide rail 11; then, through the rotation of the rotary table, the ball enters the inner grinding track area 20 through the right ball inlet slide rail 12 and the inner track ball inlet hole 4.

[0046] 5) The balls, after being ground in the inner grinding track area 20, enter the left material tray 8 through the inner track ball outlet hole 10 and the left ball outlet slide rail 6;

[0047] 6) After the sphere completes one grinding cycle in both the inner grinding track area 20 and the outer grinding track area 21, a grinding cycle is formed.

[0048] 7) Repeat steps 2) to 6) above until the sphere meets the qualification standard, then remove it.

[0049] In operation, the balls are orderly and alternately transferred between the inner and outer grinding tracks, and the suspended abrasive particles are wrapped around the surface of the balls under the synergistic effect of the magnetic field force and the dynamic movement of the balls, which ensures the consistency of the grinding envelope of the surface of the balls through track circulation and eliminates the accumulation of abrasive particles relying on the magnetic suspension effect, thereby building a double guarantee of "controllable circulation + uniform abrasive particles" from the mechanism.

Claims

1. Integrated magnetic suspension abrasive grain double-disk-sphere inner and outer orbit circulation grinding device, characterized in that, The application relates to a ball grinding device, which comprises a grinding disc, a flat disc, a left material disc, a right material disc, a magnetic disc and magnetic composite abrasive grains, wherein the grinding surface of the grinding disc is provided with an inner grinding track area and an outer grinding track area, the flat disc is provided with an inner track ball inlet hole, an inner track ball outlet hole, an outer track ball inlet hole and an outer track ball outlet hole, the inner track ball inlet hole and the inner track ball outlet hole correspond to the inner grinding track area in position, and the outer track ball inlet hole and the outer track ball outlet hole correspond to the outer grinding track area in position; the left material disc is connected with the outer track ball inlet hole through a left ball inlet sliding rail and connected with the inner track ball outlet hole through a left ball outlet sliding rail, and the right material disc is connected with the inner track ball inlet hole through a right ball inlet sliding rail and connected with the outer track ball outlet hole through a right ball outlet sliding rail; the flat disc is oppositely arranged with the grinding surface of the grinding disc, and the magnetic composite abrasive grains are arranged between the flat disc and the grinding disc; and the magnetic disc is arranged on the back surface of the grinding disc.

2. The integrated magnetic levitation abrasive particle dual-disk-sphere inner and outer orbit circulation grinding device according to claim 1, characterized in that, The inner grinding track area comprises a plurality of tracks, each track adopts a plurality of arc splicing structures, and the circumferences of the tracks are equal; and the outer grinding track area comprises a plurality of tracks, each track adopts a plurality of arc splicing structures, and the circumferences of the tracks are equal.

3. The integrated magnetic levitation abrasive particle dual-disk-sphere inner and outer orbit circulation grinding device according to claim 1, characterized in that, The magnetic disc is provided with annular inner and outer magnetic areas, the inner magnetic area corresponds to the inner grinding track area in position, and the outer magnetic area corresponds to the outer grinding track area in position.

4. The integrated magnetic levitation abrasive particle dual-disk-sphere inner and outer orbit circulation grinding device according to claim 3, characterized in that, The inner and outer magnetic areas are annular arrays of permanent magnets with N and S poles alternately distributed.

5. The integrated magnetic levitation abrasive particle dual-disk-sphere inner and outer orbital circulation lapping device of claim 1, wherein, The grinding disc is made of alumina-silicon carbide composite ceramic and is a non-magnetic material.

6. The integrated magnetic levitation abrasive particle dual-tray sphere inner and outer orbit circulation grinding device according to claim 1, characterized in that, The bottom of each of the left and right material discs is provided with a circular rotating disc, the circular rotating disc is driven by a motor and provides power for the circulation of the balls.

7. The integrated magnetic levitation abrasive particle dual-disk-sphere inner and outer orbital circulation lapping device of claim 1, wherein, Each of the left ball inlet sliding rail, the left ball outlet sliding rail, the right ball inlet sliding rail and the right ball outlet sliding rail is paved with a conveyor belt, and the conveyor belts are driven by motors.

8. The integrated magnetic levitation abrasive particle dual-tray sphere inner-outer orbital circulation lapping device according to claim 1, wherein, The left material disc is provided with a first ball inlet, a first ball outlet and a first baffle, the first ball inlet is connected with the left ball outlet sliding rail, the first ball outlet is connected with the left ball inlet sliding rail, and the first baffle is arranged on the left material disc and located between the first ball inlet and the first ball outlet at one end; and the right material disc is provided with a second ball inlet, a second ball outlet and a second baffle, the second ball inlet is connected with the right ball outlet sliding rail, the second ball outlet is connected with the right ball inlet sliding rail, and the second baffle is arranged on the right material disc and located between the second ball inlet and the second ball outlet at one end.

9. A method of integrated magnetic suspension abrasive particles' dual-disk in- and out-orbit circulation grinding, using the integrated magnetic suspension abrasive particles' dual-disk in- and out-orbit circulation grinding device as claimed in any one of claims 1 to 8, characterized in that, The application further discloses a ball grinding method, which comprises the following steps: 1) connecting the grinding disc and the magnetic disc with a driving mechanism of a horizontal ball grinding machine and connecting the flat disc with a pressurizing mechanism of the horizontal ball grinding machine; 2) starting the motor to drive the circular rotating disc to rotate, so that the balls in the left material disc are transported to the grinding disc through the left ball inlet sliding rail and the outer track ball inlet hole; 3) starting the driving mechanism of the horizontal ball grinding machine to drive the grinding disc and the magnetic disc to rotate, starting the pressurizing mechanism of the horizontal ball grinding machine to pressurize the flat disc, and performing ball grinding processing; and the magnetic disc drives the magnetic composite abrasive grains to be in a suspended state; 4) the balls ground through the outer grinding track area enter the right material disc through the right ball outlet sliding rail from the outer track ball outlet hole, and then the balls enter the inner grinding track area through the right ball inlet sliding rail and the inner track ball inlet hole through the rotation of the circular rotating disc; 5) the balls ground through the inner grinding track area enter the left material disc through the left ball outlet sliding rail from the inner track ball outlet hole; 6) after the balls are ground once in the inner grinding track area and the outer grinding track area, one grinding cycle is completed. 7) Repeat the above steps 2) - 6) until the spheres reach the required specifications.

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