CN111283549B - Planetary disc type ball mill - Google Patents
Planetary disc type ball mill Download PDFInfo
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- CN111283549B CN111283549B CN202010212865.XA CN202010212865A CN111283549B CN 111283549 B CN111283549 B CN 111283549B CN 202010212865 A CN202010212865 A CN 202010212865A CN 111283549 B CN111283549 B CN 111283549B
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- ball mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
- B24B37/025—Lapping machines or devices; Accessories designed for working surfaces of revolution designed for working spherical surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/34—Accessories
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses an upper grinding disc for a disc type ball mill, wherein V-shaped grooves distributed along the circumferential direction are formed in the lower surface of the upper grinding disc, and the lower surface of the upper grinding disc is used for being matched with the upper surface of a lower grinding disc; the upper grinding disc is connected with the floating component and used as a floating grinding disc. The V-shaped grooves are arranged on the upper grinding disc to limit and grind the microspheres, the floating grinding disc is adopted for the upper grinding disc, the limiting effect on the microspheres in the grinding process is weakened, the microspheres can effectively roll reversely, the rolling randomness of the spheres in the disc ball mill is improved, the uniform stress of the spheres in all angles is ensured, and the grinding quality is improved.
Description
Technical Field
The invention relates to the technical field of ball polishing, in particular to a planetary disc ball mill.
Background
Precision metal spheres have irreplaceable important roles in applications such as roundness measuring instruments, electrostatic gyroscopes, bearings, and in laser fusion experiments, precision hollow metal spheres are often used as ignition targets. Among many grinding and polishing methods for precision metal spheres, a disc ball mill has the advantages of high grinding efficiency and high discharging speed compared with a four-axis polishing machine, a plasma polishing method and the like, and can grind a plurality of spheres at the same time, so that the method is widely adopted. As ball grinding and polishing equipment, the disc type polishing machine has undergone a development process for hundreds of years, and has extremely important application in the fields of ceramics, metallurgy, chemical industry, aerospace, national defense and the like. Common disc ball mill processing methods include planetary disc processing methods, ball rolling processing methods, swing processing methods, and the like, and each of these processing methods has advantages and disadvantages.
The planetary disc type machining mode has a good machining effect in theory for machining single spheres. The planetary disc type processing mode can realize medium batch processing, but the improvement of the processing effect of the sphere is accompanied with the change of the revolution linear speed of the sphere, namely the phenomenon that the sphere is easy to be crowded and collided in the processing process, so that the processing effect is poor.
The ball rolling processing mode has a good processing effect in theory for processing single ball, but cannot realize batch processing. In order to achieve the theoretical processing effect, the processing mode needs to meet the requirement that the friction force between the upper grinding disc and the lower grinding disc is the same as that of the ball, but the rolling friction force of the ball along the tangential direction of the groove is required to be larger than the sliding friction force along the radial direction, but the rolling friction force is almost impossible to achieve in practical application.
The swinging type machining mode meets the condition of pure rolling assumption and is consistent with the planetary disc machining mode, so that the method has the advantages of both the ball rolling type machining mode and the planetary disc machining mode. However, the rotation speed of the upper disc in the swinging machining mode is changed and depends on the rotation speed of the lower grinding disc and the center distance between the rotating shafts of the upper grinding disc and the lower grinding disc, so that the equipment has high complexity and high failure probability in use.
The existing main stream disc ball mill has the advantages of high grinding efficiency and capability of realizing batch processing, however, the main stream disc ball mill has a certain gap in processing precision, and index parameters such as surface roughness, sphericity and the like of the processed ball body compared with ultra-precise polishing methods such as four-axis polishing and the like. The main reason is that the ball rolling in the disc ball mill has poor randomness, the moving direction of the ball rolling between the upper grinding disc and the lower grinding disc is fixed, and the whole grinding of the grinding ball is uneven, and the performance indexes such as surface roughness and the like are poor.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the traditional disc ball mill has poor rolling randomness of the ball in the disc ball mill, and the processed ball has poor index parameters such as surface roughness, sphericity and the like.
The invention is realized by the following technical scheme:
an upper grinding disc for a disc type ball mill, wherein the lower surface of the upper grinding disc is provided with V-shaped grooves distributed along the circumferential direction, and the lower surface of the upper grinding disc is used for being matched with the upper surface of the lower grinding disc; the upper grinding disc is connected with the floating component and used as a floating grinding disc.
The V-shaped grooves are arranged on the upper grinding disc to limit and grind the microspheres, the floating grinding disc is adopted for the upper grinding disc, the limiting effect on the microspheres in the grinding process is weakened, the microspheres can effectively roll reversely, the rolling randomness of the spheres in the disc ball mill is improved, the uniform stress of the spheres in all angles is ensured, and the grinding quality is improved.
Further, the angle of the V-shaped groove is 90 degrees.
The opening angle of the V-shaped groove is set to directly determine the distribution of contact points of the inner wall of the V-shaped groove on the surface of the ball, and the rolling limiting effect of the microsphere, the grinding efficiency and the grinding quality are affected. According to the invention, the angle of the V-shaped groove is preferably set to be 90 degrees, so that the grinding efficiency and the grinding quality of the microsphere are improved to the greatest extent.
Further, an eccentric groove is further formed in the lower surface of the upper grinding disc, and the eccentric groove is communicated with the V-shaped groove; the depth of the eccentric groove is larger than that of the V-shaped groove in the axial line direction of the upper grinding disc.
The invention is provided with the eccentric groove which is mainly used for driving the sphere to rotate in the circumferential direction. In the grinding process, the microspheres move along the V-shaped groove until reaching the eccentric groove, the microspheres lose the limit of the V-shaped groove and are driven by the lower grinding disc to roll and turn in the eccentric groove until reaching the inlet of the V-shaped groove again, and the microspheres can easily enter the V-shaped groove to be ground continuously because the upper grinding disc is a floating disc.
Further, the eccentric groove takes the center of the upper grinding disc as a fan-shaped structure and penetrates through the upper grinding disc along the axial direction.
The invention is beneficial to the rolling of the microspheres by arranging the eccentric groove in a fan-shaped structure and is smoothly slid into the V-shaped groove along the edge of the eccentric groove under the centrifugal action of the lower grinding disc, so that the microspheres can not stay in the eccentric groove for too long time, and ineffective grinding work is prevented.
Further, in the radial direction, the axial center of the rotating shaft for connecting the upper grinding disc is deviated from the disc center of the upper grinding disc by a distance R, which satisfies R > 0.
Aiming at the problem that the microsphere diameter is small and the transverse rolling angular velocity omega t is almost zero, the invention designs the eccentric upper grinding disc, the microsphere is offset on the upper grinding disc by an angle, the friction component force of transverse rolling is increased, namely the transverse rolling angular velocity omega t is increased, the movement track of the microsphere sphere is spiral, and the disc type machine channel grinding principle is satisfied.
Further, the value of R is the sum of the diameter value of the grinding microsphere and the allowable error.
The size of the R value influences the transverse rolling effect of the microsphere and the running safety of equipment, and the invention selects the R value as the sum of the diameter value and the allowable error of the grinding microsphere through the optimal design, thereby being beneficial to guaranteeing the optimal transverse rolling effect of the microsphere, improving the rolling randomness of the microsphere and guaranteeing the uniform grinding stress while the equipment runs safely.
An upper grinding member for a disc ball mill comprising an upper grinding disc for a disc ball mill as described above; the grinding device also comprises a floating component, wherein the floating component drives the upper grinding disc to float up and down.
Further, the floating part comprises an elastic piece and a pressing plate, one end of the elastic piece is connected with the pressing plate, the pressing plate is connected with the upper grinding disc through a mounting piece, elastic grinding pressure is applied through the elastic piece, and the elastic grinding pressure is transmitted to the upper grinding disc through the pressing plate and the mounting piece.
The invention takes elastic pressure as grinding pressure, namely grinding load pressure acting on the microspheres, reduces the limiting effect on the microspheres in the grinding process, ensures that the microspheres can effectively roll reversely, is beneficial to improving the rolling randomness of the spheres in the disc ball mill, ensures uniform stress of the spheres at all angles and improves the grinding quality.
Further, a weighing sensor is arranged between the pressing plate and the mounting piece.
The existing precise pressure sensors are arranged on the upper grinding disc, so that the pressure applied to the ground ball can be fed back in real time; and the reverse design that the V-shaped groove is positioned on the eccentric floating disc is combined, so that the uniformity, controllability and accuracy of stress of the ball body during movement in the groove can be effectively improved, the purpose of improving the polishing precision of the ball body is achieved, and batch processing can be realized.
A planetary disc ball milling mechanism comprising a lower grinding disc, an upper grinding disc for a disc ball mill, or an upper grinding part for a disc ball mill; the upper surface of the lower grinding disc is matched with the lower surface of the upper grinding disc, and the upper surface of the lower grinding disc is of a plane structure.
The upper surface of the lower grinding disc is set to be in a plane structure, the microspheres are independently arranged on the upper surface of the lower grinding disc, and are influenced by gravity center deviation, so that the microspheres roll on the upper surface of the lower grinding disc, the flat surface has no limit effect on the microspheres, and the microspheres are limited by the V-shaped grooves of the floating upper grinding disc, so that the rolling freedom degree is greatly increased in the processing process, and the uniform grinding of the microspheres in all directions is ensured.
The planetary disc ball mill comprises the planetary disc ball milling mechanism and further comprises an X-direction moving component, wherein the X-direction moving component drives the upper grinding disc to move in the radial direction relative to the lower grinding disc.
In order to achieve equal speed of a microsphere contact point line, in a linear speed control mode, the first is to control the speed of a servo motor, the second is to control the action radius of a floating disc, and the second mode is characterized in that by adjusting the action radius, the invention drives an upper grinding disc (or an integral installation structure of the upper grinding disc) to transversely move by arranging an X-direction moving part, so that the upper grinding disc is radially displaced, thereby changing the angular speed omega t of the processed microsphere and promoting the microsphere to transversely roll.
The invention has the following advantages and beneficial effects:
1. The V-shaped grooves are formed in the upper grinding disc to limit and grind the microspheres, the floating grinding disc is adopted in the upper grinding disc, the limiting effect on the microspheres in the grinding process is weakened, and the microspheres can be effectively reversely rolled; meanwhile, the upper surface of the lower grinding disc is set to be a plane structure, the microspheres are independently arranged on the upper surface of the lower grinding disc, and are influenced by gravity center deflection, so that the microspheres roll on the upper surface of the lower grinding disc, the flat surface has no limit effect on the microspheres, and the microspheres are limited by the V-shaped grooves of the floating upper grinding disc, so that the rolling freedom degree in the processing process is greatly increased, the rolling randomness of the spheres in the disc ball mill is improved, the uniform stress of the spheres at all angles is ensured, and the grinding quality is improved.
2. According to the invention, through the eccentric design, the design of the eccentric groove and the arrangement of the X-direction moving part, the change of the angular velocity omega t of the processed microsphere is facilitated, the microsphere can be promoted to transversely roll, the randomness of the microsphere movement is improved, and the uniform grinding of the microsphere in all directions is ensured.
3. The grinding structure provided by the invention can be suitable for grinding the microspheres with the spherical diameters of 0.7-3 mm, and the processing precision of the microspheres with the diameters of 0.7-3 mm is as follows: the spherical diameter tolerance is less than or equal to 2 mu m; surface roughness: rq is less than or equal to 0.05 mu m. The microspheres are subjected to the maximum working pressure of: 20.0N, namely the pressure is adjustable within the range of 0N-20N, and the pressure control precision is + -.5N. The maximum travel of the floating disc is as follows: 125.0mm, namely the travel is adjustable within the range of 0 mm-125.0 mm, and the travel control precision is +/-0.1 mm.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a schematic axial cross-sectional view of an upper grinding disc of the present invention;
FIG. 2 is a schematic top view of the upper polishing plate of the present invention;
FIG. 3 is a schematic top view of the upper polishing plate of the present invention, dimensioned;
FIG. 4 is a schematic view showing the structure of an upper grinding member for a disk ball mill according to the present invention;
FIG. 5 is a schematic view of the adapting structure of the upper polishing plate and the lower polishing plate according to the present invention;
fig. 6 is a schematic structural diagram of a planetary disc ball milling mechanism according to the present invention.
In the drawings, the reference numerals and corresponding part names: 1-an upper grinding disc, 2-a lower grinding disc, 3-a rotating shaft, 4-V-shaped grooves, 5-eccentric grooves, 6-a pressing plate and 7-a weighing sensor; 81-upper grinding disc mounting seats, 82-ball splines, 83-upper grinding disc pulleys, 84-upper grinding motors, 85-motor pulleys, 86-thrust ball bearings, 87-upper grinding synchronous belts, 88-bearing seat end covers, 89-pulley connecting shafts, 810-bearing seats, 811-spline shaft connecting gaskets, 812-angular contact bearings and 813-motor mounting seats; cylindrical compression spring 91, linear bearing 92, bearing sleeve 93 and guide post 94, 95-sensor mounting flange, 96-sensor press seat, 10-X direction moving part.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
The embodiment provides an upper grinding disc for a disc type ball mill, wherein a V-shaped groove 4 which is distributed along the circumferential direction is arranged on the lower surface of the upper grinding disc 1 near the outer edge, and the lower surface of the upper grinding disc 1 is used for being matched with the upper surface of a lower grinding disc 2; the upper grinding disc 1 is used as a floating grinding disc by being connected with a floating component. The angle of the V-groove 4 is 90 °. The V-shaped groove 4 is used for accommodating microspheres, and the size of the V-shaped groove 4 is set according to the diameter of the grinding microsphere, such as the diameter of the machinable microsphere: 0.7 mm-3 mm, adopts symmetrical right angle V-shaped grooves, and provides three V-shaped grooves which are respectively: the width of the corresponding groove of the microsphere with the diameter of 0.7mm is 1.12mm; the microsphere with the diameter of 2.0mm corresponds to the width of the groove of 3.16mm, the microsphere with the diameter of 3.0mm corresponds to the width of the groove of 4.68mm, and the precision of the width of the groove is +/-0.002 mm.
The lower surface of the upper grinding disc 1 is also provided with an eccentric groove 5, and the eccentric groove 5 is communicated with the V-shaped groove 4, as shown in figures 1 to 3. The depth of the eccentric groove 5 is greater than the depth of the V-shaped groove 4 in the axial direction of the upper grinding disc 1. The eccentric groove 5 is in a fan-shaped structure with the center of the upper grinding disc 1 as the center, and penetrates through the upper grinding disc 1 along the axial direction.
In the radial direction, the offset distance R between the axis of the rotating shaft 3 for connecting the upper grinding disc 1 and the disc center of the upper grinding disc 1 is satisfied that R is more than 0, preferably, the value of R is the sum of the diameter value of the grinding microsphere and the allowable error, for example, for the microsphere with the diameter of 0.8mm, the value of R is 0.8+/-0.1 mm; for microspheres with a diameter of 2.0mm, the value of R is 2.0.+ -. 0.1mm; for microspheres with a diameter of 3.0mm, the value of R is 3.0.+ -. 0.1mm.
Example 2
The present embodiment provides an upper grinding member for a disc ball mill, comprising an upper grinding disc for a disc ball mill provided in embodiment 1; the grinding machine also comprises a floating component which drives the upper grinding disc 1 to float up and down. The floating part comprises an elastic piece and a pressing plate 6, one end of the elastic piece is connected with the pressing plate 6, the pressing plate is connected with the upper grinding disc 1 through a mounting piece, elastic grinding pressure is applied through the elastic piece, and the elastic grinding pressure is transmitted to the upper grinding disc 1 through the pressing plate 6 and the mounting piece. A weighing sensor 7 is also arranged between the pressing plate 6 and the mounting piece.
The specific structure of the elastic member may be a spring-based structure. As shown in fig. 4, the mount includes an upper grinding disc mount 81, a ball spline 82, an upper grinding disc pulley 83, an upper grinding motor 84, a motor pulley 85, and a thrust ball bearing 86. The upper part of the upper rod section of the ball spline 82 is rotatably arranged on the upper grinding disc mounting seat 81 through a bearing; an upper grinding disc belt wheel 83 is coaxially and rigidly connected to the lower part of the upper rod section of the ball spline 82, and the upper grinding disc belt wheel 83 is in transmission connection with a motor belt wheel 85 arranged at the output end of an upper grinding motor 84 through an upper grinding synchronous belt 87. The grinding disk 1 is mounted on the lower end of the ball spline 82, and a thrust ball bearing 86 is provided on the upper end of the ball spline 82.
The elastic member includes a cylindrical compression spring 91, a linear bearing 92, a bearing housing 93, and a guide post 94. The load cell 7 is secured between an upper mounting flange connected to the top end of the thrust ball bearing 86 and a lower mounting flange connected to the bottom end of the guide post 94. The bottom end of the sensor pressing seat 95 is fixed on the upper grinding disc mounting seat 81, and the top end is connected with the bearing sleeve 93.
Example 3
This embodiment provides a planetary ball milling mechanism comprising a lower grinding plate 2, and further comprising an upper grinding plate for a disc ball mill provided in embodiment 1, or an upper grinding member for a disc ball mill provided in embodiment 2. The upper surface of the lower grinding disc 2 is matched with the lower surface matched with the upper grinding disc 1, and the upper surface of the lower grinding disc 2 is of a smooth plane structure.
Example 4
The present embodiment provides a planetary ball mill, including a planetary ball milling mechanism provided in embodiment 3, further including an X-direction moving member that drives the upper grinding disc 1 to move in a radial direction with respect to the lower grinding disc 2. Wherein the X-direction moving part adopts the existing screw rod-linear guide rail mechanism.
Example 5
Further improvements on the basis of example 4, as shown in fig. 6, the device is designed as two stations, one station for roughing and one station for finishing, the functional structure of the two stations being completely identical. Each station mainly comprises five parts, and consists of a set of lower grinding mechanism, a set of left-right symmetrical upper grinding X moving mechanism and a set of left-right symmetrical upper grinding mechanism respectively.
The grinding structure provided by the embodiment can be suitable for grinding the microspheres with the spherical diameters of 0.7-3 mm, and the processing precision of the microspheres with the diameters of 0.7-3 mm is as follows: the spherical diameter tolerance is less than or equal to 2 mu m; surface roughness: rq is less than or equal to 0.05 mu m. The microspheres are subjected to the maximum working pressure of: 20.0N, namely the pressure is adjustable within the range of 0N-20N, and the pressure control precision is + -.5N. The maximum travel of the floating disc is as follows: 125.0mm, namely the travel is adjustable within the range of 0 mm-125.0 mm, and the travel control precision is +/-0.1 mm.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. An upper grinding disc for a disc ball mill is characterized in that V-shaped grooves (4) distributed along the circumferential direction are formed in the lower surface of the upper grinding disc (1), the lower surface of the upper grinding disc (1) is used for being matched with the upper surface of a lower grinding disc (2), and the upper surface of the lower grinding disc (2) is of a planar structure;
the upper grinding disc (1) is used for being connected with a floating part and used as a floating grinding disc;
an eccentric groove (5) is further formed in the lower surface of the upper grinding disc (1), and the eccentric groove (5) is communicated with the V-shaped groove (4); the depth of the eccentric groove (5) is larger than that of the V-shaped groove (4) in the axial line direction of the upper grinding disc (1);
The eccentric groove (5) takes a sector structure with the center of the upper grinding disc (1) as the center, and penetrates through the upper grinding disc (1) along the axial direction;
In the radial direction, the offset distance R between the axis of the rotating shaft (3) for connecting the upper grinding disc (1) and the disc center of the upper grinding disc (1) meets R > 0.
2. An upper grinding pan for a pan ball mill according to claim 1, characterized in that the angle of the V-groove (4) is 90 °.
3. An upper grinding pan for a pan ball mill according to claim 1, characterized in that the value of R is the sum of the diameter value of the grinding microsphere and the allowable error.
4. An upper grinding member for a disc ball mill, characterized by comprising an upper grinding disc for a disc ball mill as claimed in any one of claims 1 to 3; the grinding device also comprises a floating component, wherein the floating component drives the upper grinding disc (1) to float up and down.
5. An upper grinding part for a disc ball mill according to claim 4, characterized in that the floating part comprises an elastic member and a pressing plate, one end of the elastic member is connected with the pressing plate, the pressing plate is connected with the upper grinding disc (1) through a mounting member, elastic grinding pressure is applied through the elastic member, and the elastic grinding pressure is transmitted to the upper grinding disc (1) through the pressing plate and the mounting member.
6. An upper grinding unit for a disc ball mill according to claim 5, characterized in that a load cell (7) is also provided between the platen and the mounting.
7. A planetary disc ball milling mechanism comprising a lower grinding disc (2), characterized by further comprising an upper grinding disc for a disc ball mill according to any one of claims 1 to 3, or an upper grinding member for a disc ball mill according to any one of claims 4 to 6; the upper surface of the lower grinding disc (2) is matched with the lower surface matched with the upper grinding disc (1), and the upper surface of the lower grinding disc (2) is of a plane structure.
8. A planetary ball mill comprising a planetary ball milling mechanism according to claim 7, and further comprising an X-direction moving member that moves the upper grinding plate (1) in a radial direction with respect to the lower grinding plate (2).
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| CN202010212865.XA CN111283549B (en) | 2020-03-24 | 2020-03-24 | Planetary disc type ball mill |
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| CN202010212865.XA CN111283549B (en) | 2020-03-24 | 2020-03-24 | Planetary disc type ball mill |
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| CN204954546U (en) * | 2015-08-31 | 2016-01-13 | 成都光明光学元件有限公司 | Spherical lens correct grinding mill |
| CN106239351A (en) * | 2016-08-08 | 2016-12-21 | 河南平高电气股份有限公司 | A kind of lapping device |
| CN206702825U (en) * | 2017-02-16 | 2017-12-05 | 自贡硬质合金有限责任公司 | A kind of sintered carbide ball abrasive disk |
| CN107297677A (en) * | 2017-06-21 | 2017-10-27 | 西安航晨机电科技股份有限公司 | Simple grain ball ultraprecise disk grinder |
| CN212265516U (en) * | 2020-03-24 | 2021-01-01 | 中国工程物理研究院激光聚变研究中心 | Upper grinding disc, upper grinding part, planetary disc ball-milling mechanism and ball-milling device |
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|---|---|
| CN111283549A (en) | 2020-06-16 |
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