Device for grinding silicon nitride ceramic balls

Abstract

The utility model discloses a device for grinding silicon nitride ceramic balls, which comprises an external hanging body, the external hanging body is provided with a flow guide groove and a drainage groove which are communicated with each other, a flow guide column is arranged in the flow guide groove and is matched with the flow guide groove to form an annular flow guide channel, and a baffle is arranged in the drainage groove. The baffle divides the drainage groove into a drainage inlet and a drainage outlet, one side of the drainage groove is communicated with the outside, one end of the baffle abuts against the flow guide column, the other end of the baffle extends out of the outside, and the external hanging body is further provided with a fixing piece connected with grinding equipment. According to the utility model, the balls can be fully mixed and the grinding channels can be randomly changed, so that the batch diameter variation of the ceramic balls is reduced, the quality grade of the ceramic balls is improved, and meanwhile, the yield of high-precision ceramic balls is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding silicon nitride ceramic balls, in particular to a device for grinding silicon nitride ceramic balls. Background Art

[0002] Advanced ceramics represented by silicon nitride have excellent comprehensive properties such as low density, high hardness, damage resistance, low thermal expansion coefficient, good chemical stability and thermal stability. They are considered to be one of the best materials for manufacturing high-speed and high-precision bearing rolling elements. Ceramic bearings with silicon nitride ceramic balls as rolling elements are particularly suitable for use under working conditions such as high speed, high temperature, low torque, and lean lubrication. For example, they are used as high-speed electric spindle bearings for precision machine tools, wind power bearings, and aerospace bearings. With the development of my country's high-end manufacturing industry, higher requirements are also put forward for the performance of silicon nitride ceramic balls. At present, for high-precision silicon nitride ceramic balls, G3 grade is the highest grade of precision, and its technical indicators are surface roughness ≤10nm and batch diameter variation ≤130nm. In addition, with the rapid growth of market demand, it is also urgent to explore a stable process that can increase the output of high-precision silicon nitride ceramic balls. The grinding method of ceramic balls plays an important role in the variation of the batch diameter of ceramic balls, which in turn affects the precision of ceramic balls, especially medium and large-sized (ceramic ball diameter greater than 10.000mm) silicon nitride ceramic balls. During the grinding process of ceramic balls, since the circumference of each grinding channel from the inside to the outside of the grinding disc is different, the distances traveled by the ceramic balls in different channels are different for each rotation of the grinding disc. For example, in a complete grinding cycle, the frequency of grinding in one or several adjacent channels will be high, which will eventually lead to large batch diameter variations and dimensional tolerances of the inner and outer ceramic balls in the entire batch. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a device for grinding silicon nitride ceramic balls, which can fully mix the balls and randomly change the grinding channels, thereby reducing the batch diameter variation of the ceramic balls, improving the quality grade of the ceramic balls, and at the same time increasing the output of high-precision ceramic balls.

[0004] In order to solve the above technical problems, the utility model provides a device for grinding silicon nitride ceramic balls, including an external body, the external body is provided with a guide groove and a drainage groove that are connected through each other, a guide column is provided in the guide groove and cooperates to form an annular guide channel, a baffle is provided in the drainage groove, the baffle divides the drainage groove into a drainage inlet and a drainage outlet, one side of the drainage groove is connected to the outside, one end of the baffle is abutted against the guide column, and the other end extends to the outside, and the external body is also provided with a fixing connected to the grinding equipment.

[0005] Furthermore, a plurality of mixing ball convex parts are arranged in the annular guide channel.

[0006] Furthermore, the mixing ball convex part is a hemispherical structure, and the spacing between adjacent mixing ball convex parts is 2-4 times the diameter of the mixing ball convex part.

[0007] Furthermore, the bottom of the guide groove and the bottom of the drainage groove are located on the same horizontal plane.

[0008] Furthermore, the inner wall of the guide groove is an arc surface, the guide groove and the guide column are concentrically arranged, and the diameter of the guide column is 0.3-0.5 times the diameter of the guide groove.

[0009] Furthermore, the baffle extends into the opening of the upper grinding disc in the grinding device, and blocks and drains the ceramic balls on the lower grinding disc in the grinding device.

[0010] Furthermore, the fixing part includes a lifting cross plate, one end of which is locked and connected to the upper grinding disk in the grinding equipment, and the other end of the lifting cross plate is provided with a locking hole. The lifting cross plate is sleeved on the threaded column through the locking hole, and a butterfly nut is provided on the threaded column, and the threaded column is fixedly connected to the external body.

[0011] Furthermore, the locking hole is a U-shaped structure or an oblong structure.

[0012] Furthermore, the surface of the external body located on one side of the drainage groove is configured as an arc-shaped surface.

[0013] Furthermore, a marking platform is provided on the top surface of the guide column.

[0014] Beneficial effects of the utility model:

[0015] The utility model can make the ceramic balls in the lower grinding disc complete the mixing of balls and the change of grinding channels in time after each rotation, so that the ceramic balls go through the same processing distance within the grinding cycle, thereby reducing the batch diameter variation of the ceramic balls and improving the surface grinding uniformity and processing accuracy of the whole batch of ceramic balls. In addition, the use of the device can increase the input amount of ceramic balls in each grinding cycle, improve production capacity and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the utility model when in use;

[0018] Figure 3 This is a schematic diagram of the installation structure of a new type of guide column and baffle. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0020] Reference Figure 1 and Figure 2 As shown, an embodiment of the silicon nitride ceramic ball grinding device of the utility model includes an external body 1, on which a guide groove 2 and a drainage groove 3 that are connected to each other are arranged, a guide column 4 is arranged in the guide groove and cooperates to form an annular guide channel, a baffle 5 is arranged in the drainage groove, and the baffle divides the drainage groove into a drainage inlet and a drainage outlet, one side of the drainage groove is connected to the outside, one end of the baffle is abutted against the guide column, and the other end extends to the outside, specifically, the baffle extends into the opening of the upper grinding disk 112 in the grinding equipment 111, and blocks and drains the ceramic balls 114 on the lower grinding disk 113 in the grinding equipment, and a fixing part 6 connected to the grinding equipment is also provided on the external body, specifically, it is fixedly connected to the upper grinding disk.

[0021] When in use, there is a fixing member to fix the device as a whole on the upper grinding disc. When the grinder is in working state, the upper grinding disc remains stable, and the lower grinding disc rotates counterclockwise or clockwise under the drive of the grinder motor. In this embodiment, it rotates counterclockwise. The ceramic ball rolls out from the complete channel formed by the upper grinding disc channel and the lower grinding disc channel to the opening position under the drive of the counterclockwise rotation of the lower grinding disc, and is blocked at the baffle. When the ceramic ball encounters the baffle, it will enter from the drainage inlet through the accumulation and extrusion after blocking, and move in the annular diversion channel, and finally enter the lower grinding disc at the opening again from the drainage outlet, and enter the next grinding cycle as the lower grinding disc rotates. The ceramic ball can achieve the effect of changing the grinding channel in the process of entering the device from the lower grinding disc and then entering the lower grinding disc from the device. The bottom of the diversion groove and the bottom of the diversion groove are located on the same horizontal plane, and are also kept on the same horizontal plane with the upper end surface of the lower grinding disc, so as to ensure the smoothness of the ceramic ball when moving in the device.

[0022] In order to improve the effect of changing the grinding channel, a plurality of mixing ball convex parts 7 are also arranged in the annular flow guide channel. Under the action of the mixing ball convex parts, the ceramic balls continuously change their moving positions in the annular flow guide channel and perform sufficient mixing. The effect of randomly selecting the grinding channel is better. The mixing ball convex parts are hemispherical structures, which can effectively reduce the movement resistance of the ceramic balls, and the spacing between adjacent mixing ball convex parts is 2-4 times the diameter of the mixing ball convex parts, ensuring the mixing ball effect.

[0023] By using this device, the guide groove and the drainage groove can accommodate additional ceramic balls, which is equivalent to increasing the grinding path per week, thereby correspondingly increasing the grinding space of the ceramic balls. Therefore, compared with a grinder without this device, the input amount of ceramic balls can be effectively increased, thereby increasing the production capacity of ceramic balls.

[0024] The inner wall of the guide groove is an arc surface, the guide groove and the guide column are concentrically arranged, and the diameter of the guide column is 0.3-0.5 times the diameter of the guide groove, which meets the requirements of smooth diversion and mixing of balls. The surface of the external body located on one side of the guide groove is set as an arc surface, and the curvature of the arc surface is consistent with the curvature of the upper grinding disc and the lower grinding disc, so that it can be effectively fitted to prevent the ceramic ball from falling. An identification table 12 is set on the top surface of the guide column to indicate the diameter range of ceramic balls applicable to the device.

[0025] The above-mentioned fixing parts include a lifting cross plate 8, one end of which is locked and connected to the upper grinding disk in the grinding equipment. A fixing column is provided on the upper grinding disk. The position of the lifting cross plate can be fixed by locking two hexagonal nuts to form a cantilever structure. A locking hole 9 is provided on the other end of the lifting cross plate. The lifting cross plate is sleeved on the threaded column 10 through the locking hole. A butterfly nut 11 is provided on the threaded column, and the threaded column is fixedly connected to the external body.

[0026] As the grinding equipment continues to grind, the height of the upper and lower grinding discs will gradually decrease, so it is necessary to adjust in time so that the bottom plane of the groove of the device and the upper end surface of the lower grinding disc remain on the same horizontal plane. During operation, the external body can be moved up and down by rotating the butterfly nut, that is, the bottom plane of the groove and the upper end surface of the lower grinding disc can be kept on the same horizontal plane according to the longitudinal relative position of the bottom of the groove and the lower grinding disc of the grinder, so as to ensure that the ceramic ball can smoothly enter and exit the device. After adjustment, the height can be locked by using a hexagonal nut and a butterfly nut.

[0027] The lock hole is a U-shaped structure or an oblong structure, which can fine-tune the gap between the arc surface on the external body and the upper grinding disc and the lower grinding disc to avoid interference.

[0028] Reference Figure 3As shown, the guide column and the baffle can be an integrated structure, which can be directly locked in the external body by bolts during installation. In order to reduce the difficulty of assembly, a through first groove 13 and a second groove 14 are provided on the bottom of the groove corresponding to the guide column and the baffle. During installation, the integrated structure can be directly embedded in the first groove and the second groove, and can be locked with one screw. The first groove and the second groove have a rotation-stopping effect, and the assembly position has high accuracy, while also increasing the force strength of the baffle. After installation, the bottom surface height of the baffle will sink slightly relative to the bottom of the groove. In order to ensure that it can extend into the opening of the upper grinding disk without interference, an avoidance groove 15 is provided at the bottom of the protruding part of the baffle to meet the assembly requirements.

[0029] The above embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in this technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A device for grinding silicon nitride ceramic balls, characterized in that: It includes an external body, on which a guide groove and a drainage groove are connected and connected through each other. A guide column is arranged in the guide groove and cooperates to form an annular guide channel. A baffle is arranged in the drainage groove, and the baffle divides the drainage groove into a drainage inlet and a drainage outlet. One side of the drainage groove is connected to the outside, one end of the baffle is in contact with the guide column, and the other end extends to the outside. A fixing part connected to the grinding equipment is also arranged on the external body.

2. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: A plurality of mixing ball convex parts are arranged in the annular flow guide channel.

3. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: The mixing ball convex part is a hemispherical structure, and the distance between adjacent mixing ball convex parts is 2-4 times of the diameter of the mixing ball convex part.

4. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: The bottom of the guide groove and the bottom of the drainage groove are located on the same horizontal plane.

5. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: The inner wall of the guide groove is an arc surface, the guide groove and the guide column are concentrically arranged, and the diameter of the guide column is 0.3-0.5 times the diameter of the guide groove.

6. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: The baffle extends into the opening of the upper grinding disc in the grinding equipment, and blocks and guides the ceramic balls on the lower grinding disc in the grinding equipment. The baffle and the guide column are an integrated structure.

7. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: The fixing part includes a lifting cross plate, one end of which is locked and connected to the upper grinding disk in the grinding equipment, and the other end of the lifting cross plate is provided with a locking hole. The lifting cross plate is sleeved on the threaded column through the locking hole, and a butterfly nut is provided on the threaded column, and the threaded column is fixedly connected to the external body.

8. The silicon nitride ceramic ball grinding device according to claim 7, characterized in that: The locking hole is a U-shaped structure or an oblong structure.

9. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: The surface of the external body located on one side of the drainage groove is configured as an arc surface.

10. The silicon nitride ceramic ball grinding device according to claim 1, characterized in that: A marking platform is arranged on the top surface of the guide column.

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