Double-tray ball internal and external orbital circulation grinding device for horizontal ball mill

Abstract

The utility model relates to a double material disc ball inner and outer track circulation grinding device for horizontal ball grinder. The technical scheme is: including grinding disc, flat disc, left material disc and right material disc, the grinding surface of grinding disc is equipped with inner grinding track area and outer grinding track area, and the grinding surface of flat disc is oppositely arranged with grinding disc, flat disc is equipped with inner rail ball inlet hole, inner rail ball outlet hole, outer rail ball inlet hole and outer rail ball outlet hole, and the export of inner rail ball inlet hole and inner rail ball outlet hole is located at the end surface of flat disc and is opposite to inner grinding track area, and the export of outer rail ball inlet hole and outer rail ball outlet hole is located at the end surface of flat disc and is opposite to outer grinding track area, left material disc and right material disc are located at the both sides of flat disc respectively, left material disc is connected with outer rail ball inlet hole through left ball inlet slide rail and is connected with inner rail ball outlet hole through left ball outlet slide rail, right material disc is connected with inner rail ball inlet hole through right ball inlet slide rail and is connected with outer rail ball outlet hole through right ball outlet slide rail, the utility model can make the sphericity of ball more uniform, and improve the equal cutting probability of product.

Description

Technical Field

[0001] This utility model belongs to the field of ultra-precision machining of spheres, specifically relating to a double-disc sphere inner and outer track circulating grinding device for a horizontal sphere grinding machine. Background Technology

[0002] In the field of ultra-precision machining of ceramic spheres, the traditional concentric V-groove grinding method suffers from problems such as uneven material removal, poor batch consistency (sphericity error fluctuation exceeding 0.3μm within the same batch), and low processing efficiency due to the fixed groove curvature causing the sphere's spin angle to remain constant. To improve trajectory uniformity, variable curvature groove technology uses an eccentric equidistant spiral design to enable continuous dynamic changes in the sphere's spin angle from 0° to 180°, achieving full envelope of the sphere's trajectory within a single cycle. However, this technology still has significant drawbacks: when processing multiple spheres in parallel, interference between the spheres leads to trajectory disorder, especially in the processing of high-hardness silicon nitride ceramics (Vickers hardness ≥15GPa); simultaneously, existing single-disc circulation systems cannot achieve periodic and orderly switching between the inner and outer grinding tracks, resulting in significant differences in the cumulative grinding amount in different areas of the sphere, and the sphere is prone to surface damage due to collisions during loading and unloading. Furthermore, the high hardness and brittleness of silicon nitride poses a bottleneck to the machining of variable curvature grooves, resulting in a material removal rate that is more than 40% lower than that of bearing steel balls. While subsequent magnetorheological polishing can achieve nanoscale surface roughness (Ra≤5nm) and G5-level sphericity (error≤0.12μm), its global breading polishing equipment is expensive, and coordination with the process parameters of the preceding grinding stage is difficult, thus limiting the overall machining efficiency. In existing improvement schemes, suppressing vibration by reducing the operating speed sacrifices machining efficiency (the fine grinding speed needs to be limited to below 20rpm), while silicon nitride-specific machining requires additional wear equation modeling and groove optimization, further increasing the process complexity.

[0003] To address the technical bottlenecks of complex and inefficient circulation mechanisms in vertical ball grinding machines, an innovative horizontal layout scheme is adopted. Its circulation mechanism, through the coordinated control of dual material trays and upper and lower ball inlet and outlet tracks, significantly simplifies the mechanical structure and improves installation convenience. Simultaneously, relying on a closed-loop conveying path, it achieves orderly alternation of balls between the inner and outer grinding tracks, improving circulation efficiency compared to the vertical structure. In a horizontal ball grinding machine, the drive mechanism drives the grinding disc to rotate, and the pressure mechanism applies a load to the flat plate. Ball processing is achieved through the interaction between the grinding disc and the flat plate. While this structure offers advantages such as large ball capacity and convenient circulation grinding, and its circulation mechanism significantly improves efficiency compared to the vertical structure, the existing circulation system has a fundamental flaw: the lack of a precise track switching control mechanism during the process of the processed balls flowing out of the circulation system through the outlet and then flowing back into the grinding area through the inlet results in inconsistent circulation cycles between the inner and outer grinding tracks. This disordered circulation causes random differences in the actual grinding stroke of balls in the same batch, leading to excessively large dispersion in the equal cutting probability distribution, severely restricting the ultra-precision machining requirements of highly consistent ceramic balls. Utility Model Content

[0004] This invention provides a double-disc ball inner and outer track circulating grinding device for a horizontal ball grinding machine, which enables the ball to be ground alternately in the inner grinding track and the outer grinding track, so that the grinding area envelope experienced by the ball is approximately the same, making the sphericity of the ball more uniform in the same batch of products after processing, and improving the probability of equal cutting of the product.

[0005] The technical solution of this utility model is as follows:

[0006] A dual-disc sphere internal and external track circulating grinding device for a horizontal sphere grinding machine includes a grinding disc, a flat disc, a left material disc, and a right material disc. The grinding surface of the grinding disc has an inner grinding track area and an outer grinding track area. The flat disc is arranged opposite to the grinding surface of the grinding disc. The flat disc has 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 outlets of the inner track ball inlet hole and the inner track ball outlet hole located at the end face of the flat disc face the inner grinding track area, and the outlets of the outer track ball inlet hole and the outer track ball outlet hole located at the end face of the flat disc face the outer grinding track area. The left material disc and the right material disc are located on opposite sides of the flat disc. The left material disc is connected to the outer track ball inlet hole via a left ball inlet slide rail and to the inner track ball outlet hole via a left ball outlet slide rail. The right material disc is connected to the inner track ball inlet hole via a right ball inlet slide rail and to the outer track ball outlet hole via a right ball outlet slide rail.

[0007] Furthermore, the double-disc sphere inner and outer track circulating grinding device for the horizontal sphere grinding machine has multiple tracks in the inner grinding track area, each track adopting multiple arc splicing structures, and the circumference of each track is equal; and multiple tracks in the outer grinding track area, each track adopting multiple arc splicing structures, and the circumference of each track is equal.

[0008] Furthermore, in the dual-disc ball inner and outer track circulating grinding device for the horizontal ball grinding machine, both the bottom of the left and right discs are equipped with rotating discs, which are driven by motors to provide power for the circulation of the balls.

[0009] Furthermore, in the dual-disc ball inner and outer track circulating grinding device for the horizontal ball grinding machine, 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 covered with conveyor belts, and the conveyor belts are all driven by motors.

[0010] Furthermore, the double-disc ball inner and outer track circulating grinding device for the horizontal ball grinding machine has the following configuration: the left disc is provided with an inlet 1, an outlet 1, and a first baffle. The inlet 1 is connected to the left outlet slide rail, and the outlet 1 is connected to the left inlet slide rail. The first baffle is disposed on the left disc with one end located between the inlet 1 and the outlet 1. The right disc is provided with an inlet 2, an outlet 2, and a second baffle. The inlet 2 is connected to the right outlet slide rail, and the outlet 2 is connected to the right inlet slide rail. The second baffle is disposed on the right disc with one end located between the inlet 2 and the outlet 2.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This invention constructs a closed-loop circulation path by connecting the left and right material trays with the ball inlet and outlet of the flat plate in a closed loop, and utilizes the characteristics of the arc splicing variable curvature track to achieve a topological structure with a constant outer track circumference and a constant inner track circumference. Combined with stop block timing control and rotary table power drive, it realizes the orderly alternating flow of the ball between the inner and outer grinding tracks.

[0013] 2. The compact structure of this invention effectively eliminates the randomness of track switching in traditional circulation systems, ensuring a high degree of consistency in the grinding envelope area of ​​spheres in the same batch, and significantly improving sphericity uniformity and equal cutting probability. This invention replaces the probabilistic track-changing mode with a deterministic flow mechanism, enabling the spheres to accurately enter the target grinding track according to a preset path, achieving ultra-precision machining quality control while reducing process complexity. Attached Figure Description

[0014] Figure 1 A schematic diagram of a double-disc ball internal and external track circulating grinding device used in a horizontal ball grinding machine;

[0015] Figure 2 Right view of a double-disc ball internal and external track circulating grinding device used in a horizontal ball grinding mill;

[0016] Figure 3 This is a schematic diagram of the left tray;

[0017] Figure 4 This is a schematic diagram of the right tray;

[0018] Figure 5 This is a schematic diagram of the grinding surface of the grinding disc;

[0019] Figure 6 This is a schematic diagram of the outlet at the end face of the flat plate. Detailed Implementation

[0020] like Figure 1-6 As shown, a double-disc ball inner and outer track circulating grinding device for a horizontal ball grinding machine includes a grinding disc 1, a flat disc 2, a left material disc 3, and a right material disc 4. The grinding surface of the grinding disc 1 is provided with an inner grinding track area 15 and an outer grinding track area 16. The flat disc 2 is arranged opposite to the grinding surface of the grinding disc 1. The flat disc 2 is provided with an inner track ball inlet hole 24, an inner track ball outlet hole 21, an outer track ball inlet hole 22, and an outer track ball outlet hole 23. The inner track ball inlet hole 24 and the inner track ball outlet hole 21 are located on the flat disc. The outlet at the end face of plate 2 faces the inward grinding track area 15, the outer rail ball inlet hole 22 and the outer rail ball outlet hole 23 are located at the outlet facing the outward grinding track area 16 at the end face of plate 1; the left material plate 3 and the right material plate 4 are located on both sides of plate 2 respectively, the left material plate 3 is connected to the outer rail ball inlet hole 22 through the left ball inlet slide rail 5, and the left ball outlet slide rail 6 is connected to the inner rail ball outlet hole 21, the right material plate 4 is connected to the inner rail ball inlet hole 24 through the right ball inlet slide rail 8, and the right ball outlet slide rail 7 is connected to the outer rail ball outlet hole 23.

[0021] The inner grinding track area 15 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 16 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.

[0022] Both the left and right material trays 3 and 4 have a rotating disc at their bottom, which is driven by a motor to provide power for the circulation of the balls. The left ball-in slide rail 5, the left ball-out slide rail 6, the right ball-in slide rail 8, and the right ball-out slide rail 7 are all covered with conveyor belts, which are all driven by motors.

[0023] The left material tray 3 is provided with a ball inlet 11, a ball outlet 12 and a first baffle 9. The ball inlet 11 is connected to the left ball outlet slide rail 6 and the ball outlet 12 is connected to the left ball inlet slide rail 5. The first baffle 9 is set on the left material tray 3 and one end of it is located between the ball inlet 11 and the ball outlet 12. The right material tray 4 is provided with a ball inlet 2 14, a ball outlet 2 13 and a second baffle 10. The ball inlet 2 14 is connected to the right ball outlet slide rail 7 and the ball outlet 2 13 is connected to the right ball inlet slide rail 8. The second baffle 10 is set on the right material tray 4 and one end of it is located between the ball inlet 2 14 and the ball outlet 2 13.

[0024] The work process includes the following steps:

[0025] 1) Connect the grinding disc 1 to the drive mechanism of the horizontal ball grinding machine, and connect the flat disc 2 to the pressurizing mechanism of the horizontal ball grinding machine;

[0026] 2) Turn on the motor to drive the rotary table to rotate, so that the ball in the left material tray 3 is conveyed into the grinding tray 1 through the left ball-in-slide rail 5 and the outer rail ball-in-slide hole 22;

[0027] 3) Turn on the drive mechanism of the horizontal ball grinding machine to rotate the grinding disc 1; turn on the pressure mechanism of the horizontal ball grinding machine to apply pressure to the flat disc 1 to perform ball grinding.

[0028] 4) The ball, after being ground in the outer grinding track area 16, enters the right material tray 4 through the outer track ball outlet hole 23 and the right ball outlet slide rail 7; then, through the rotation of the rotary table, the ball enters the inner grinding track area 15 through the right ball inlet slide rail 8 and the inner track ball inlet hole 24.

[0029] 5) The balls, after being ground in the inner grinding track area 15, enter the left material tray 3 through the inner track ball outlet hole 21 and the left ball outlet slide rail 6;

[0030] 6) After the ball completes one grinding cycle in both the inner grinding track area 15 and the outer grinding track area 16, a grinding cycle is formed.

[0031] 7) Repeat steps 2) to 6) above until the sphere meets the qualification standard, then remove it.

Claims

1. A double-disc sphere inner and outer track circulating grinding device for a horizontal sphere grinding mill, characterized in that, The device includes a grinding disc, a flat disc, a left material disc, and a right material disc. The grinding surface of the grinding disc has an inner grinding track area and an outer grinding track area. The flat disc is arranged opposite to the grinding surface of the grinding disc. The flat disc has an inner rail ball inlet hole, an inner rail ball outlet hole, an outer rail ball inlet hole, and an outer rail ball outlet hole. The outlets of the inner rail ball inlet hole and the inner rail ball outlet hole located at the end face of the flat disc face the inner grinding track area, and the outlets of the outer rail ball inlet hole and the outer rail ball outlet hole located at the end face of the flat disc face the outer grinding track area. The left material disc and the right material disc are located on opposite sides of the flat disc. The left material disc is connected to the outer rail ball inlet hole via a left ball inlet slide rail and to the inner rail ball outlet hole via a left ball outlet slide rail. The right material disc is connected to the inner rail ball inlet hole via a right ball inlet slide rail and to the outer rail ball outlet hole via a right ball outlet slide rail.

2. The double-disc sphere inner and outer track circulating grinding device for a horizontal sphere grinding machine according to claim 1, characterized in that, The inner grinding track area has multiple tracks, each using a multi-arc splicing structure, and all tracks have the same circumference; the outer grinding track area also has multiple tracks, each using a multi-arc splicing structure, and all tracks have the same circumference.

3. The double-disc sphere inner and outer track circulating grinding device for a horizontal sphere grinding machine according to claim 1, characterized in that, Both the left and right material trays have a rotating disc at their bottom, which is driven by a motor to provide power for the circulation of the sphere.

4. The double-disc sphere inner and outer track circulating grinding device for a horizontal sphere grinding machine according to claim 1, characterized in that, The left ball-scoring rail, left ball-ejecting rail, right ball-scoring rail, and right ball-ejecting rail are all equipped with conveyor belts, which are all driven by motors.

5. The double-disc sphere inner and outer track circulating grinding device for a horizontal sphere grinding machine according to claim 1, characterized in that, The left material tray is equipped with an inlet 1, an outlet 1, and a first baffle. The inlet 1 is connected to the left outlet slide rail, and the outlet 1 is connected to the left inlet slide rail. The first baffle is set on the left material tray with one end located between the inlet 1 and the outlet 1. The right material tray is equipped with an inlet 2, an outlet 2, and a second baffle. The inlet 2 is connected to the right outlet slide rail, and the outlet 2 is connected to the right inlet slide rail. The second baffle is set on the right material tray with one end located between the inlet 2 and the outlet 2.

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