Grinding disc for surface machining of large-size light reflecting mirror

Abstract

The utility model relates to the technical field of precision optical processing, in particular to a grinding disc for processing the surface of a large-size light-weight reflecting mirror, which comprises a disc-shaped body and a plurality of through holes, the body comprises a working surface and a non-working surface which are oppositely arranged, and the through holes are formed in the working surface and the non-working surface. The axis of each through hole is perpendicular to the working face, the multiple through holes are formed in the radial direction of the body at intervals, the multiple through holes are formed in multiple circles in the circumferential direction of the body, the multiple through holes in the same circle are formed at intervals, the diameter of each through hole is d, the diameter of the working face is D, and d is smaller than or equal to 0.1 D. According to the grinding disc for machining the surface of the large-size light-weight reflector, the through hole is formed in the body, so that grinding slurry can be directly added to the central area of a lens to be ground through the through hole, and then it is guaranteed that the lens to be ground has excellent optical performance; and a plurality of through holes are formed, so that the effect of reducing the weight of the body is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of precision optical processing, and relates to a grinding disc for machining the surface of a large-size lightweight mirror. Background Art

[0002] As a precision optical element, a mirror is widely used in the fields of astronomy, meteorology, energy, etc., and plays the role of signal acquisition and energy transmission. The manufacturing process of a mirror generally includes processes such as blank preparation, milling and forming, grinding, polishing, and coating. Among them, grinding is an indispensable and important link in the entire mirror manufacturing process, playing a connecting role. On the one hand, grinding can further improve the surface shape accuracy of the mirror surface on the basis of milling and forming, remove the milling tool marks, and improve the consistency of the surface quality of the mirror; on the other hand, grinding can further reduce the surface roughness and reduce the thickness of the subsurface damage layer, thereby shortening the subsequent polishing time and improving the processing efficiency.

[0003] The grinding process in the mirror manufacturing process includes: first, making a metal grinding disc that matches the mirror surface shape with materials such as cast iron, stainless steel, or copper, and grooving its working surface to ensure uniform distribution of grinding sand; then, mixing fine powders such as white corundum, silicon carbide, or boron carbide with water to make a grinding slurry; finally, using a grinding machine to make the mirror and the grinding disc rotate in the same direction and generate a radial relative motion, and controlling the grinding effect by adjusting parameters such as rotation speed, swing speed, swing amplitude, and pressure.

[0004] When processing small and medium-sized mirrors (diameter less than 500 mm), the above traditional process fully meets the grinding requirements. However, when the mirror size is large (diameter greater than 500 mm), the central area of the mirror is always covered by the grinding disc during the grinding process, and the grinding slurry is added from the edge of the mirror, resulting in that the grinding sand cannot fully enter the central area of the mirror, thus causing the problem of uneven grinding on the mirror surface, seriously affecting the surface shape and the consistency of the surface quality. In addition, for a large-size lightweight mirror, since the mirror skeleton is a hollow structure, its structural strength is worse than that of a solid mirror, and its compressive capacity is weak. It is necessary to strictly control the weight of the grinding disc to prevent the lightweight mirror from being damaged by the grinding disc. Summary of the Utility Model

[0005] The utility model provides a grinding disc for machining the surface of a large-size lightweight mirror, which is used to solve the defects of uneven grinding and easy damage existing in the grinding process of a large-size lightweight mirror in the prior art, and realizes the grinding of a large-size lightweight mirror.

[0006] An embodiment of the utility model discloses a grinding disc for machining the surface of a large-size lightweight mirror, including:

[0007] The body, the body is disc-shaped, and the body includes a working surface and a non-working surface arranged opposite to each other;

[0008] A plurality of through holes, the axis of each through hole is perpendicular to the working surface, and the plurality of through holes are arranged at intervals in the radial direction of the body. In the circumferential direction of the body, the plurality of through holes are arranged on a plurality of circles, and the plurality of through holes on the same circle are arranged at intervals;

[0009] The diameter of the through hole is d, and the diameter of the working surface is D, where d ≤ 0.1D;

[0010] The projected area of each through hole on the working surface is s, the number of through holes is n, and the area of the working surface is S, where n×s ≤ 0.7S.

[0011] According to the lapping plate for large-size lightweight mirror surface processing provided by the embodiments of the present invention, by providing through holes on the body, on the one hand, the design of the through holes enables the lapping slurry to be directly added to the central area of the lens to be lapped through these through holes, and ensures that the slurry can be evenly distributed on the entire surface of the lens to be lapped. The uniform distribution of the lapping slurry helps to improve the quality consistency of the surface of the lens to be lapped, which is beneficial to the surface shape control of the lens to be lapped, and further ensures that the lens to be lapped finally has excellent optical performance. On the other hand, providing a plurality of through holes also plays a role in reducing the weight of the body. Reducing the weight can not only reduce the pressure of the body on the lens to be lapped during the lapping process, reduce the risk of the lens to be lapped being damaged due to the excessive weight of the body, but also improve the flexibility and efficiency during the lapping process.

[0012] In some embodiments, a chamfer is provided at the junction of the inner circumferential surface of each through hole and the working surface, and the size of the chamfer is C1, C2 or C3.

[0013] In some embodiments, a connecting portion is provided on the non-working surface, and the connecting portion protrudes from the non-working surface in a direction away from the working surface.

[0014] In some embodiments, a mating hole is provided on the connecting portion, and the mating hole includes a first section and a second section arranged in sequence from the working surface to the non-working surface, and the cross-sectional area of the first section is smaller than the cross-sectional area of the second section.

[0015] In some embodiments, the mating hole further includes a third section, the third section is provided between the first section and the second section, and the cross-sectional area of the third section gradually increases in the direction from the working surface to the non-working surface. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a grinding disc for surface machining of a large-sized lightweight mirror provided by an embodiment of the present utility model.

[0018] Figure 2 It is a schematic structural diagram of another perspective of a grinding disc for surface machining of a large-sized lightweight mirror provided by an embodiment of the present utility model.

[0019] Figure 3 It is a schematic cross-sectional view of a grinding disc for surface machining of a large-sized lightweight mirror provided by an embodiment of the present utility model.

[0020] Reference numerals:

[0021] 1. Body; 11. Working surface; 12. Non-working surface; 2. Through hole; 3. Connecting portion; 31. Fitting hole; 311. First section; 312. Second section; 313. Third section. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0023] The following combines Figures 1 - 3 Describe the grinding disc for surface machining of a large-sized lightweight mirror of the present utility model. The lens ground by the grinding disc for surface machining of a large-sized lightweight mirror described in the embodiment of the present utility model is mainly a large-sized mirror with a diameter greater than 500 mm.

[0024] The grinding disc for surface machining of a large-sized lightweight mirror in the embodiment of the present utility model includes a body 1 and a plurality of through holes 2.

[0025] The body 1 is disc-shaped, and the body 1 includes a working surface 11 and a non-working surface 12 arranged oppositely.

[0026] The axis of each through hole 2 is perpendicular to the working surface 11. In the radial direction of the body 1, multiple through holes 2 are arranged at intervals. In the circumferential direction of the body 1, multiple through holes 2 are arranged on multiple circles, and multiple through holes 2 on the same circle are arranged at intervals.

[0027] The diameter of the through hole 2 is d, and the diameter of the working surface 11 is D, where d ≤ 0.1D.

[0028] The projected area of each through hole 2 on the working surface 11 is s, the number of through holes 2 is n, and the area of the working surface 11 is S, where n×s ≤ 0.7S.

[0029] As Figures 1 to 3 shown, the body 1 is disc-shaped, the outer peripheral surface of the body 1 is circular, and both the working surface 11 and the non-working surface 12 are circular. The side of the body 1 facing the lens to be processed is the working surface 11, and the other side of the body 1 is the non-working surface 12. A plurality of through holes 2 are provided on the body 1, and the through holes 2 penetrate through the working surface 11 and the non-working surface 12. And the plurality of through holes 2 are evenly distributed on the body 1.

[0030] In the radial direction of the body 1, multiple through holes 2 are arranged in sequence. In other words, the line segment formed by connecting the projection points of the center lines of the multiple through holes 2 arranged in the radial direction of the body 1 on the working surface 11 coincides with the radius of the working surface 11.

[0031] In the circumferential direction of the body 1, multiple through holes 2 are arranged on multiple circles. In other words, the projection points of the center lines of the multiple through holes 2 arranged in the circumferential direction of the body 1 on the working surface 11 are all on a circle concentric with the working surface 11. And multiple through holes 2 are arranged on multiple circles, that is, the center lines of the multiple through holes 2 enclose multiple circular rings and are arranged on the body 1.

[0032] It can be understood that the number of through holes 2 is set according to actual needs.

[0033] For example, multiple through holes 2 are respectively arranged on 2 to 6 circles. Optionally, multiple through holes 2 are respectively arranged on 2, 4 or 6 circles.

[0034] For example, 2 to 8 through holes 2 are provided on the same radius. Optionally, 2, 6 or 8 through holes 2 are provided on the same radius.

[0035] For example, 4 to 20 through holes 2 are provided on the same circle. Optionally, 4, 12 or 20 through holes 2 are provided on the same circle.

[0036] The diameter of the through hole 2 is d, and the diameter of the working surface 11 is D, where d ≤ 0.1D. For example, d is 0.1D, 0.08D, or 0.05D, etc. The main function of the through hole 2 is to evenly distribute the grinding fluid on the surface of the lens to be ground, so as to achieve a good grinding effect. If the through hole 2 is too large, it will reduce the effective grinding area of the working surface 11, affecting the grinding accuracy and efficiency. In the embodiment of the present utility model, by setting d ≤ 0.1D, the size of the through hole 2 is kept within a reasonable range, which helps to improve the grinding accuracy and efficiency.

[0037] The projected area of each through hole 2 on the working surface 11 is s, the number of through holes 2 is n, and the area of the working surface 11 is S, where n × s ≤ 0.7S.

[0038] For example, n × s is 0.7S, 0.65S, or 0.5S, etc. If the total area of the through holes 2 is too large, it will reduce the effective area of the working surface 11. On the one hand, it will reduce the structural stiffness of the working surface 11, affecting the surface shape processing accuracy of the lens to be ground; on the other hand, it will increase the wear rate of the working surface 11 and reduce the service life of the working surface 11. Since the area of the working surface 11 occupied by the through holes 2 does not exceed 70%, it not only reduces the weight of the grinding disc, but also at least 30% of the area on the working surface 11 can be used as an effective grinding area, which helps to keep more grinding media on the working surface 11, thereby improving the grinding efficiency.

[0039] According to the grinding disc for the surface processing of large-size lightweight reflectors provided by the embodiment of the present utility model, by providing through holes 2 on the body 1, on the one hand, the design of the through holes 2 enables the grinding slurry to be directly added to the central area of the lens to be ground through these through holes 2, and ensures that the slurry can be evenly distributed on the entire surface of the lens to be ground. The even distribution of the grinding slurry helps to improve the quality consistency of the surface of the lens to be ground, which is beneficial to the surface shape control of the lens to be ground, and further ensures that the lens to be ground finally has excellent optical performance. On the other hand, providing a plurality of through holes 2 also plays a role in reducing the weight of the body 1. Reducing the weight can not only reduce the pressure of the body 1 on the lens to be ground during the grinding process, reducing the risk of the lens to be ground being damaged due to the excessive weight of the body 1, but also improve the flexibility and efficiency during the grinding process. In addition, for the grinding disc for the surface processing of large-size lightweight reflectors described in the embodiment of the present utility model, by setting d ≤ 0.1D and n × s ≤ 0.7S, the weight of the grinding disc is reduced, the grinding slurry is evenly distributed on the surface of the lens to be ground, greatly improving the processing reliability and surface quality consistency, and at the same time being beneficial to the surface shape control of the lens to be ground.

[0040] In some embodiments, the diameter of the outer peripheral surface of the body 1 is e, and the diameter of the lens to be ground is E, where e / E is 0.6 to 0.8. For example, e / E is 0.6, 0.7, or 0.8.

[0041] According to the abrasive disc for the surface machining of large-sized lightweight mirrors described in the embodiments of the present utility model, by adjusting the diameter of the working surface 11 to be 60%-80% of the maximum diameter of the lens to be ground and combining it with appropriate grinding process parameters (such as rotational speed, swing speed, swing amplitude, etc.), the radius of curvature or flatness of the lens to be ground can be effectively corrected, ensuring that the grinding process is both efficient and does not reduce the grinding quality, thereby obtaining the best correction effect.

[0042] It should be noted that when a chamfer is provided at the junction of the working surface 11 and the outer peripheral surface of the body 1, the diameter D of the working surface 11 is slightly smaller than the diameter e of the outer peripheral surface of the body 1. When no chamfer is provided at the junction of the working surface 11 and the outer peripheral surface of the body 1, the diameter e of the outer peripheral surface of the body 1 is equal to the diameter D of the working surface 11.

[0043] In some embodiments, a chamfer is provided at the junction of the inner peripheral surface of each through hole 2 and the working surface 11, and the sizes of the chamfers are C1, C2, or C3. According to the abrasive disc for the surface machining of large-sized lightweight mirrors described in the embodiments of the present utility model, the chamfer can reduce the stress concentration at the junction of the edge of the through hole 2 and the working surface 11, thereby improving the structural strength and durability of the abrasive disc.

[0044] In some embodiments, a connecting portion 3 is provided on the non-working surface 12, and the connecting portion 3 protrudes from the non-working surface 12 in a direction away from the working surface 11.

[0045] As Figure 2 and Figure 3 shown, the connecting portion 3 is used to connect the abrasive disc to a grinding machine (not shown in the figure), and the structure of the connecting portion 3 can be designed according to needs. For example, the connecting portion 3 can be designed as a structure with threads so as to be connected to the drive shaft of the grinding machine by means of thread fitting. The connecting portion 3 can be designed as a structure including a keyway, and is fitted with a key on the drive shaft of the grinding machine through the keyway to transmit torque.

[0046] According to the abrasive disc for the surface machining of large-sized lightweight mirrors described in the embodiments of the present utility model, by using the connecting portion 3, a reliable connection between the body 1 and the grinding machine can be achieved, ensuring stability during use.

[0047] In some embodiments, as Figure 2 and Figure 3 shown, the connecting portion 3 is cylindrical.

[0048] According to the abrasive disc for the surface machining of large-sized lightweight mirrors described in the embodiments of the present utility model, by setting the connecting portion 3 to be cylindrical, thus, the design and manufacture of the cylindrical connecting portion 3 are relatively simple, which helps to reduce production costs, and at the same time reduces the possibility of dirt accumulation and can reduce dust accumulation.

[0049] In some embodiments, a mating hole 31 is provided on the connecting portion 3. The mating hole 31 includes a first section 311 and a second section 312 arranged in sequence from the working surface 11 to the non-working surface 12. The cross-sectional area of the first section 311 is smaller than that of the second section 312.

[0050] As Figure 2 and Figure 3 shown, the mating hole 31 on the connecting portion 3 is used to cooperate with the rotating shaft on the grinding machine, so as to fix the body 1 on the grinding machine. The mating hole 31 is a stepped hole. The first section 311 is arranged adjacent to the working surface 11 relative to the second section 312, and the second section 312 is arranged adjacent to the non-working surface 12. The end of the rotating shaft is a stepped shaft, which is convenient for connection with the mating hole 31. The rotating shaft and the mating hole 31 are in interference fit or key fit.

[0051] Optionally, the cross-sections of both the first section 311 and the second section 312 are circular, which is convenient for processing. Alternatively, the cross-sections of both the first section 311 and the second section 312 are rectangular, and the end of the rotating shaft is also rectangular, so as to prevent the body 1 and the rotating shaft from sliding.

[0052] In some embodiments, the mating hole 31 further includes a third section 313. The third section 313 is arranged between the first section 311 and the second section 312, and the cross-sectional area of the third section 313 gradually increases in the direction from the working surface 11 to the non-working surface 12.

[0053] As Figure 2 and Figure 3 shown, one end of the third section 313 is connected to the first section 311, the other end of the third section 313 is connected to the second section 312. The cross-section of the third section 313 is circular, and the third section 313 is a transition section with a gradually changing diameter.

[0054] According to the grinding disc for the surface processing of large-size lightweight reflectors described in the embodiments of the present invention, by adopting a transition section design with a gradually changing diameter for the third section 313, stress can be effectively dispersed, stress concentration at the connection between the first section 311 and the second section 312 can be reduced, so that cracks or fractures in the connecting portion 3 can be prevented, and thus the strength and durability of the grinding disc can be improved. Moreover, the gradually changing design of the third section 313 facilitates the alignment and positioning of the rotating shaft and the mating hole 31, which helps to simplify the installation process between the body 1 and the grinding machine.

[0055] In some embodiments, the material of the body 1 is ductile iron. Ductile iron has a relatively high tensile strength and can withstand large pressures and loads without being easily deformed or fractured. Compared with other types of cast iron, ductile iron has better toughness and is not easily broken when subjected to impacts, which improves the service life of the grinding disc.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grinding disc for surface machining of a large-sized lightweight mirror, characterized in that, Comprising: A body, the body being disc-shaped, the body including a working surface and a non-working surface arranged oppositely; A plurality of through holes, the axis of each through hole being perpendicular to the working surface, the plurality of through holes being arranged at intervals in the radial direction of the body, the plurality of through holes being arranged on a plurality of circles in the circumferential direction of the body, and the plurality of through holes on the same circle being arranged at intervals; The diameter of the through hole is d, and the diameter of the working surface is D, wherein d≤0.1D; The projected area of each through hole on the working surface is s, the number of the through holes is n, and the area of the working surface is S, wherein n×s≤0.7S.

2. The lapping plate for machining the surface of a large-sized lightweight mirror according to claim 1, wherein, A chamfer is provided at the junction of the inner circumferential surface of each through hole and the working surface, and the size of the chamfer is C1, C2 or C3.

3. The lapping plate for surface machining of large-sized lightweight reflectors according to claim 1 or 2, characterized in that, A connecting portion is provided on the non-working surface, and the connecting portion protrudes from the non-working surface in a direction away from the working surface.

4. The lapping plate for surface machining of a large-sized lightweight mirror according to claim 3, characterized in that, A mating hole is provided on the connecting portion, the mating hole including a first section and a second section arranged in sequence from the working surface to the non-working surface, and the cross-sectional area of the first section is smaller than the cross-sectional area of the second section.

5. The lapping plate for machining the surface of a large-sized lightweight mirror according to claim 4, wherein The mating hole further includes a third section provided between the first section and the second section, and the cross-sectional area of the third section gradually increases in the direction from the working surface to the non-working surface.

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