A mobile polishing system and optical element processing control method

Abstract

The application discloses a mobile polishing system and an optical element processing control method, and the outer grinding machine mechanism comprises a hollow grinding disc, the bottom of the hollow grinding disc is provided with a grinding layer, the top of the hollow grinding disc is provided with a supporting cylinder, and the top of the supporting cylinder is provided with a bearing. The structure design of the inner and outer double grinding discs is adopted, on the one hand, the polishing contact area is increased through the inner and outer double grinding discs, the mobile polishing system is realized within the limited moving range of the mirror surface, the polishing grinding disc can be stretched out of the mirror surface, the effective processing of the full-aperture range of the optical element surface is realized, and the problem that the edge of the mirror surface cannot be effectively processed due to the limited moving range of the optical processing equipment on the optical element is solved; on the other hand, the inner and outer grinding machines are independent and can be controlled respectively, the process flexibility is increased, the rotating directions of the inner and outer grinding machines are set, the rotating inertias of the two are offset to each other, the stable movement of the overall equipment is beneficial, and the technical problem that the processing flexibility of the existing optical processing equipment on the large-aperture optical element is not high is solved.

Description

Technical Field

[0001] This invention belongs to the field of precision manufacturing of optical components, and relates to polishing equipment, specifically a mobile polishing system and a method for controlling the processing of optical components. Background Technology

[0002] The key performance indicators of optical telescope systems—angular resolution and energy harvesting capability—are closely related to the aperture of the optical elements in the system. To improve the angular resolution and energy harvesting capability of the system, the aperture of optical elements in optical telescope systems is constantly increasing. However, as the aperture of optical elements increases, the processing difficulty and processing cycle also increase. Existing fixed polishing systems using CNC machine tools and industrial robotic arms as carriers have insufficient efficiency in processing large-aperture optical elements. The equipment can only carry one polishing head. Due to the large size and limited flexibility of the equipment, fixed polishing systems using CNC machine tools as carriers cannot achieve parallel processing by multiple devices. Although fixed polishing systems using industrial robotic arms as carriers can achieve parallel processing by multiple devices, the number of devices that can be processed in parallel on a single element is limited (only 2-3 units) due to their technical characteristics. As the aperture of optical elements increases, the problem of insufficient processing efficiency of existing fixed polishing systems becomes more and more prominent. At the same time, due to technical difficulties and manufacturing costs, it is difficult to manufacture fixed polishing systems with a stroke of more than ten meters. Therefore, there is also an upper limit to the aperture of optical elements that existing equipment can process. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a mobile polishing system and an optical component processing control method, thereby solving the technical problems of low efficiency in the processing of large-diameter optical components due to the lack of flexibility of existing fixed polishing systems, and the limitation on the diameter of optical components that can be processed.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A mobile polishing system includes an external grinding mechanism, a moving mechanism, and an internal grinding mechanism;

[0006] The external grinding mill mechanism includes a hollow grinding disc, a grinding layer at the bottom of the hollow grinding disc, a supporting cylinder at the top of the hollow grinding disc, a bearing at the top of the cylinder, and a cylinder at the top of the bearing; a first annular protrusion is provided on the outer edge of the top of the cylinder.

[0007] The top of the cylinder is provided with an outer grinding mill frame, and an annular cavity is opened at the bottom outer edge of the outer grinding mill frame. The top of the cylinder is placed in the annular cavity, and a first compression spring is provided between the cylinder and the annular cavity.

[0008] A drive motor is installed on the side wall of the cylinder. The output shaft of the drive motor is vertically downward and fitted with a drive gear. A driven gear is fitted on the outer wall of the supporting cylinder. The driven gear meshes with the drive gear.

[0009] The moving mechanism includes a support plate disposed at the bottom of the external mill frame, a plurality of motor mounting plates disposed at the bottom of the support plate, a plurality of secondary drive motors disposed at the bottom of the motor mounting plates, and an omnidirectional moving wheel disposed at the secondary drive motor.

[0010] The internal grinding mill mechanism includes a support block fixed to the bottom of a support plate. The bottom of the support block has a cavity, and a thrust block is disposed in the cavity. The bottom of the thrust block extends out of the cavity and is equipped with a No. 3 drive motor. The end of the output shaft of the No. 3 drive motor is fitted with an internal grinding mill disc. The bottom of the internal grinding mill disc is provided with an internal grinding mill grinding layer. A second compression spring is disposed between the cavity and the thrust block.

[0011] This invention also includes the following technical features:

[0012] The bottom outer edge of the cylinder is provided with a second annular protrusion, which is bolted to the outer ring of the bearing.

[0013] The supporting cylinder is fixedly connected to the driven gear and the inner ring of the bearing via a flange structure.

[0014] The support plate is bolted to the frame of the external mill.

[0015] A groove is provided in the middle of the top of the external grinding mill frame, and a mobile power supply is installed in the groove. The mobile power supply is electrically connected to the first drive motor, the second drive motor, and the third drive motor, respectively.

[0016] A controller is installed on the top outer side of the external grinding mill frame, and the controller is electrically connected to the No. 1 drive motor, the No. 2 drive motor, and the No. 3 drive motor respectively.

[0017] The support plate and the support block are connected by a flange structure.

[0018] The material of the grinding layer or the internal grinding layer is an elastic grinding layer or a non-fluid Newtonian body grinding layer.

[0019] Furthermore, an optical element processing control method, based on the aforementioned mobile polishing system, specifically includes the following steps:

[0020] Step 1: Detect the surface shape of the optical element to be processed, subtract the obtained surface shape from the target surface shape to obtain the processing quantity distribution E, and use auxiliary tools to fix the optical element to be processed.

[0021] Step 2: Determine the processing parameters;

[0022] The processing parameters include the outer diameter R0 of the mobile polishing system, the non-processing trajectory, the preset processing trajectory, the number of mobile polishing systems N, the number of processing times n per mobile polishing system, the speed distribution Vt of the mobile polishing system on the processing trajectory, and the processing mode.

[0023] The preset processing trajectory is an equidistant grating type;

[0024] The maximum approximate circular diameter of the pre-processing trajectory is R. t The interval between adjacent rows is d;

[0025] Step 3: Input the mill rotation speed distribution Vt, processing mode, and number of processing times n for each mobile polishing system on the processing trajectory obtained in Step 2 into each mobile polishing system i, and number the mobile polishing systems performing the processing tasks sequentially to determine the processing order.

[0026] Step 4: The i-th mobile polishing system starts from the equipment waiting area and moves to the processing waiting area along the non-processing trajectory according to the processing sequence. After entering the preset processing trajectory from the processing waiting area, it performs the j-th processing on the surface of the optical element to be processed. The value of i ranges from 1, 2, 3, ..., N.

[0027] Step 5: After the i-th mobile polishing system enters the pre-processing trajectory, it starts from the waiting area along the non-processing trajectory and enters the processing waiting area. When the i-th mobile polishing system processes to the M-th row of the preset processing trajectory, it enters the preset processing trajectory from the processing waiting area and starts working.

[0028] M*d>R0

[0029] Step 6: After all mobile polishing systems complete the j-th processing according to the preset processing trajectory, they return to the equipment waiting area in sequence according to the non-processing trajectory.

[0030] Step 7: Let j = j + 1, and determine whether j > n. If yes, all mobile polishing systems will stop and proceed to step 8; otherwise, return to step 4.

[0031] Step 8: Remove the auxiliary fixtures, clean the optical components to be processed, and inspect the surface shape.

[0032] Step two specifically includes the following steps:

[0033] Step 2.1: Determine the outer diameter R0 of the mobile polishing system based on the maximum approximate circular diameter R of the optical element to be processed;

[0034] Step 2.2: Determine the number N of mobile polishing systems and the number of processing times n for each mobile polishing system according to the following formula;

[0035] N = R / (R0 + 2d)

[0036]

[0037] in:

[0038] t is the time required for each mobile polishing system to traverse the preset processing trajectory once;

[0039] n is a positive integer;

[0040] Step 2.3: The center of the largest approximate circle of the pre-processing trajectory is the origin, the direction parallel to the trajectory grating is the x-axis, and the direction perpendicular to the trajectory grating is the y-axis. A coordinate system is established to obtain the velocity distribution Vt of the moving polishing system on the processing trajectory.

[0041]

[0042] in:

[0043] y is the distance between the centroid O of the mobile polishing system and the x-axis, -R t <y<R t ;

[0044] Step 2.4: Select the processing mode according to the curvature of the optical element to be processed. If the radius of curvature is greater than the preset curvature value, select mode one; otherwise, select mode two.

[0045] Mode 1 controls the processing volume distribution by changing the mill rotation speed; the mill rotation speed distribution along the processing trajectory is V. m ;

[0046]

[0047] H = k × p × v

[0048] in:

[0049] E represents the distribution of the quantity to be processed;

[0050] H represents the instantaneous material removal rate of the optical element to be processed at a certain point on the trajectory of the mill mounted on the system;

[0051] k is a constant coefficient related to time, temperature, and the abrasive being processed;

[0052] p represents the normalized distribution of contact pressure in the contact area between the machining tool and the surface of the optical element to be processed;

[0053] v represents the normalized distribution of the relative motion velocity between the machining tool and the contact surface of the optical element to be processed;

[0054] This is a deconvolution operation;

[0055] k m1 These are constant coefficients related to the mill parameters;

[0056] Mode 2 controls the processing volume distribution by changing the mill's output pressure; the output pressure distribution along the processing trajectory is P. m ;

[0057]

[0058] in:

[0059] k m2 These are constant coefficients related to the mill parameters.

[0060] Compared with the prior art, the beneficial technical effects of this invention are:

[0061] (I) The mobile polishing system proposed in this invention adopts a double grinding disc structure design, which increases the polishing contact area of ​​the grinding disc and allows the polishing grinding disc to extend out of the mirror within a limited range of movement, realizing effective processing of the full aperture range of the optical element surface. Compared with the existing fixed polishing system, it is smaller in size, more flexible, and has no upper limit on the aperture of the optical elements that can be processed, thus solving the problem that the aperture of the optical elements that can be processed by the existing technology has an upper limit.

[0062] (II) The optical element processing control method proposed in this invention is based on a mobile polishing system. It can take advantage of the small size and high flexibility of the mobile polishing system. Compared with the existing optical processing scheme based on a fixed polishing system, the method of this invention can realize the simultaneous processing of large-diameter optical elements by more equipment, which greatly improves the processing efficiency. Taking a 5m diameter element as an example, it can accommodate more than 10 mobile polishing systems to process in parallel, which solves the technical problem of low processing efficiency of large-diameter optical elements in the existing technical solution.

[0063] (III) Existing technical solutions require clamping the components onto a designated processing platform, and then removing them from the platform for testing after processing. Due to the characteristics of optical processing, the operation of moving, clamping, processing, removing, and testing needs to be repeated multiple times during the processing. Large-aperture optical components are mostly made of fragile materials, and the risk of movement is very high. However, the method described in this patent does not require moving the optical components. Processing can be carried out in the original position of the components. After processing is completed, the processing equipment and auxiliary tooling can be removed before testing can be carried out, realizing in-situ processing without moving the components, which is safer.

[0064] (IV) Compared with existing technologies, the method described in this invention has a huge economic advantage in terms of manufacturing cost, as large CNC machine tools and industrial robotic arms are expensive to manufacture, while small mobile robots are relatively more economical to manufacture. This advantage will also increase with the increase of component diameter. Attached Figure Description

[0065] Figure 1 This is a three-dimensional overall structural diagram of the mobile polishing system in this invention;

[0066] Figure 2 This is a top view of the mobile polishing system of the present invention;

[0067] Figure 3 This is a bottom view of the mobile polishing system in this invention;

[0068] Figure 4 for Figure 2 Cross-sectional view along the AA direction;

[0069] Figure 5 A schematic diagram of a mobile polishing system for processing optical components;

[0070] Figure 6 This is a schematic diagram of the preset processing trajectory of the equidistant grating type in this method;

[0071] Figure 7 This is a schematic diagram of the velocity distribution Vt of the mobile polishing system on the processing trajectory in this method;

[0072] Figure 8 This is a schematic diagram of the quantity distribution E to be processed in this method;

[0073] Figure 9 This is a schematic diagram of the mill rotation speed distribution along the machining trajectory in this method.

[0074] The meanings of the labels in the figure are as follows: 1. External grinding machine mechanism; 2. Moving mechanism; 3. Internal grinding machine mechanism; 4. Optical element to be processed; 5. Auxiliary tooling; 6. Equipment waiting area; 7. Non-processing trajectory; 8. Processing waiting area; 9. Preset processing trajectory.

[0075] Grinding layer 101, hollow grinding disc 102, driven gear 103, driving gear 104, bearing 105, first drive motor 106, cylinder 107, outer grinding mill frame 108, controller 109, mobile power supply 1010, support cylinder 1011, annular cavity 1012, first compression spring 1013.

[0076] Support plate 201, motor mounting plate 202, No. 2 drive motor 203, omnidirectional caster 204;

[0077] Support block 301, thrust block 302, grinding disc of internal mill 303, drive motor No. 3 304, grinding layer of internal mill 305, cavity 306, second compression spring 307.

[0078] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0079] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0080] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0081] This invention provides a mobile polishing system, such as... Figures 1 to 4 As shown, it includes an external mill mechanism 1, a moving mechanism 2, and an internal mill mechanism 3;

[0082] The external grinding mill mechanism includes a hollow grinding disc 102, a grinding layer 101 at the bottom of the hollow grinding disc 102, a supporting cylinder 1011 at the top of the hollow grinding disc 102, a bearing 105 at the top of the cylinder, and a cylinder 107 at the top of the bearing 105; a first annular protrusion is provided on the outer edge of the top of the cylinder 107.

[0083] The top of the cylinder 107 is provided with an external grinding mill frame 108, and the bottom outer edge of the external grinding mill frame 108 is provided with an annular cavity 1012. The top of the cylinder 107 is located in the annular cavity 1012, and a first compression spring 1013 is provided between the cylinder 107 and the annular cavity 1012.

[0084] A first drive motor 106 is provided on the side wall of the cylinder 107. The output shaft of the first drive motor 106 is vertically downward and is fitted with a drive gear 104. A driven gear 103 is fitted on the outer wall of the supporting cylinder 1011. The driven gear 103 meshes with the drive gear 104.

[0085] The moving mechanism 2 includes a support plate 201 set at the bottom of the external mill frame 108. Multiple motor mounting plates 202 are set at the bottom of the support plate 201. Multiple secondary drive motors 203 are set at the bottom of the motor mounting plates 202. The secondary drive motors 203 are equipped with omnidirectional moving wheels 204.

[0086] The internal grinding mill mechanism 3 includes a support block 301 fixed to the bottom of the support plate 201. A cavity 306 is opened at the bottom of the support block 301. A thrust block 302 is arranged in the cavity 306. The bottom of the thrust block 302 extends out of the cavity 306 and is equipped with a third drive motor 304. The end of the output shaft of the third drive motor 304 is fitted with an internal grinding mill disc 303. An internal grinding mill grinding layer 305 is arranged at the bottom of the internal grinding mill disc 303. A second compression spring 307 is arranged between the cavity 306 and the thrust block 302.

[0087] In the above technical solution, during operation, the second drive motor 203 in the moving mechanism 2 drives the omnidirectional moving wheel 204 to rotate, thereby causing the entire device to move omnidirectionally on the workpiece. Simultaneously, as the device moves omnidirectionally on the workpiece, the first drive motor 106 in the external grinding mill mechanism 1 drives the drive gear 104 to rotate, and further, through the cooperation of the drive gear 104 and the driven gear 103, drives the hollow grinding disc 102 to rotate. The grinding layer 101 located below the hollow grinding disc 102 contacts the surface of the optical element to be processed. Driven by the hollow grinding disc 102 in the outer grinding disc, relative motion is sent to the surface of the optical element to be processed. At the same time, when the grinding layer 101 contacts the surface of the optical element to be processed, the first compression spring 1013 set between the annular cavity 1012 and the cylinder 107 in the outer grinding machine mechanism 1 is in a compressed state. Its elastic force is transmitted to the contact surface between 101 and the optical element to be processed through the cylinder 107, bearing 105, and hollow grinding disc 102. Under the action of pressure, the grinding layer 101 moves relative to the surface of the optical element to be processed, thereby realizing the removal of material from the surface of the optical element to be processed. While the equipment moves omnidirectionally on the component being processed, the No. 3 drive motor 304 in the internal grinding mill mechanism 3 drives the internal grinding mill disc 303 to rotate. The internal grinding mill grinding layer 305 set below the internal grinding mill disc 303 contacts the surface of the optical component to be processed and moves relative to the surface of the optical component under the drive of the internal grinding mill disc 302. At the same time, when the internal grinding mill grinding layer 305 contacts the surface of the optical component being processed, the second compression spring 307 set between the cavity 306 and the thrust block 302 is in a compressed state. Its elastic force is transmitted through the thrust block 302, the No. 3 drive motor 304, and the internal grinding mill disc 303 to the contact surface between the internal grinding mill grinding layer 305 and the optical component to be processed. Under the action of pressure, the internal grinding mill grinding layer 305 moves relative to the surface of the optical component to be processed, thereby removing the material from the surface of the optical component to be processed.

[0088] The mobile polishing system adopts a double-grinding disc structure. On the one hand, the double grinding discs increase the polishing contact area, allowing the polishing discs to extend beyond the mirror surface within the limited movement range of the mirror, thus enabling effective processing of the entire aperture range of the optical element surface. This solves the problem that the limited movement range of optical processing equipment on optical elements prevents effective processing of the mirror edge. On the other hand, the inner and outer grinding machines are independent and can be controlled separately, increasing the process flexibility. By setting the rotation direction of the inner and outer grinding machines, their rotational inertia can be canceled out, which is beneficial to the smooth movement of the entire equipment.

[0089] Furthermore, the external grinding mechanism 1 and the internal grinding mechanism 3 are independent and can be controlled separately, increasing the process flexibility during processing. By setting the rotation directions of the external grinding disc 102 and the internal grinding disc 303, their rotational inertia can be canceled out, which is beneficial for the smooth movement of the mobile polishing system. In addition, the centers of action of the external grinding mechanism 1 and the internal grinding mechanism 3 coincide with the arrangement center of the omnidirectional moving wheel 204 of the moving mechanism 2, which simplifies the control of the system.

[0090] Specifically, a second annular protrusion is provided on the bottom outer edge of the cylinder 107, and the second annular protrusion is bolted to the outer ring of the bearing 105.

[0091] In the above technical solution, this arrangement enables 107 and 102, which are fixed to the inner ring of the bearing, to achieve relative rotational motion.

[0092] Specifically, the supporting cylinder 1011 is fixedly connected to the driven gear 103 and the inner ring of the bearing 105 through a flange structure.

[0093] In the above technical solution, the motor 106 rotates to drive the drive gear 104 to rotate, which in turn drives the driven gear 103 to rotate, so that the supporting cylinder 1011 where the hollow grinding disc 102 is located can achieve rotational motion relative to the cylinder 107, thus realizing the polishing work of the outer grinding machine mechanism 1. The driven gear 103 can be regarded as an integral part of the supporting cylinder 1011 and the outer grinding disc 102.

[0094] Specifically, the support plate 201 is bolted to the external grinding mill frame 108.

[0095] In the above technical solution, the external grinding mill mechanism 1 and the moving mechanism 2 are fixed, so that the moving mechanism 2 drives the external grinding mill mechanism 1 to move. The bolt connection makes it easy to disassemble and separate the two modules and facilitates maintenance. The bolt connection is the preferred solution, but other connection and fixing methods, such as welding, snap-fit ​​bonding, etc., can also be used.

[0096] Specifically, a groove is provided in the middle of the top of the external grinding mill frame 108, and a mobile power supply 1010 is installed in the groove. The mobile power supply 1010 is electrically connected to the first drive motor 106, the second drive motor 203 and the third drive motor 304 respectively.

[0097] In the above technical solution, if an external power supply is used, external cables need to be laid out, which will occupy space and affect the operation of other mobile polishing equipment. Therefore, a built-in mobile power supply is used to provide power to the drive motor.

[0098] Specifically, a controller 109 is installed on the top outer side of the external grinding mill frame 108. The controller 109 is electrically connected to the first drive motor 106, the second drive motor 203 and the third drive motor 304 respectively.

[0099] In the above technical solution, the rotation speeds of drive motor 106, drive motor 203 and drive motor 304 are controlled by a controller.

[0100] Specifically, the support plate 201 and the support block 301 are connected by a flange structure.

[0101] In the above technical solution, the fixed moving mechanism 2 and the internal grinding mill mechanism 3 are fixed so that the moving mechanism 2 drives the internal grinding mill mechanism 3 to move. The bolt connection makes it easy to disassemble and separate the two modules and facilitates maintenance. The bolt connection is the preferred solution, but other connection and fixing methods, such as welding, snap-fit, and gluing, can also be used.

[0102] Specifically, the material of the grinding layer 101 or the internal grinding layer 305 is an elastic grinding layer or a non-fluid Newtonian body grinding layer.

[0103] In the above technical solution, the grinding layer 101 or the grinding layer 305 of the internal grinding machine can fit more closely to the surface of the optical element to be processed, thereby improving the operational stability of the internal and external grinding discs.

[0104] Preferably, the material is polyurethane, damping cloth, adhesive abrasive, or asphalt.

[0105] See Figure 5 The present invention also provides a method for controlling the processing of optical components, based on a mobile polishing system, specifically including the following steps:

[0106] Step 1: Detect the surface shape of the optical element to be processed, subtract the obtained surface shape from the target surface shape to obtain the processing quantity distribution E, and use auxiliary tools to fix the optical element to be processed.

[0107] Step 2: Determine the processing parameters;

[0108] The processing parameters include the outer diameter R0 of the mobile polishing system, the non-processing trajectory, the preset processing trajectory, the number of mobile polishing systems N, the number of processing times n per mobile polishing system, the speed distribution Vt of the mobile polishing system on the processing trajectory, and the processing mode.

[0109] The preset processing trajectory is an equidistant grating type;

[0110] The maximum approximate circle diameter of the pre-machining trajectory is R. t The interval between adjacent rows is d;

[0111] Step 3: Input the mill rotation speed distribution Vt, processing mode, and number of processing times n for each mobile polishing system on the processing trajectory obtained in Step 2 into each mobile polishing system i, and number the mobile polishing systems performing the processing tasks sequentially to determine the processing order.

[0112] Step 4: The i-th mobile polishing system starts from the equipment waiting area and moves to the processing waiting area along the non-processing trajectory according to the processing sequence. After entering the preset processing trajectory from the processing waiting area, it performs the j-th processing on the surface of the optical element to be processed. The value of i ranges from 1, 2, 3, ..., N.

[0113] Step 5: After the i-th mobile polishing system enters the pre-processing trajectory, it starts from the waiting area along the non-processing trajectory and enters the processing waiting area. When the i-th mobile polishing system processes to the M-th row of the preset processing trajectory, it enters the preset processing trajectory from the processing waiting area and starts working.

[0114] M*d>R0

[0115] Step 6: After all mobile polishing systems complete the j-th processing according to the preset processing trajectory, they return to the equipment waiting area in sequence according to the non-processing trajectory.

[0116] Step 7: Let j = j + 1, and determine whether j > n. If yes, all mobile polishing systems will stop and proceed to step 8; otherwise, return to step 4.

[0117] Step 8: Remove the auxiliary fixtures, clean the optical components to be processed, and inspect the surface shape.

[0118] In the above technical solution, the maximum approximate circular diameter R of the pre-processing trajectory t =R-0.3×R0, the interval between adjacent rows d=0.05×R0~0.1×R0;

[0119] The equipment waiting area 6 is located outside the optical element 4 and the auxiliary tooling 5; the processing waiting area 8 is located outside the optical element 4 and on the auxiliary tooling 5.

[0120] The optical component processing control method, based on a mobile polishing system, can leverage the advantages of small size and high flexibility. Compared with existing solutions that use CNC machine tools and industrial robotic arms to carry out optical processing equipment, this invention can enable more equipment to process large-diameter optical components (over 1 meter in diameter) simultaneously, significantly improving processing efficiency and solving the technical problem of low processing efficiency of existing optical processing equipment for large-diameter optical components.

[0121] Step two specifically includes the following steps:

[0122] Step 2.1: Determine the outer diameter R0 of the mobile polishing system based on the maximum approximate circular diameter R of the optical element to be processed;

[0123] Step 2.2: Determine the number N of mobile polishing systems and the number of processing times n for each mobile polishing system according to the following formula;

[0124] N = R / (R0 + 2d)

[0125]

[0126] in:

[0127] t is the time required for each mobile polishing system to traverse the preset processing trajectory once;

[0128] n is a positive integer;

[0129] Step 2.3: The center of the largest approximate circle of the pre-processing trajectory is the origin, the direction parallel to the trajectory grating is the x-axis, and the direction perpendicular to the trajectory grating is the y-axis. A coordinate system is established to obtain the velocity distribution Vt of the moving polishing system on the processing trajectory.

[0130]

[0131] in:

[0132] y is the distance between the centroid O of the mobile polishing system and the x-axis, -R t <y<R t ;

[0133] Step 2.4: Select the processing mode according to the curvature of the optical element to be processed. If the radius of curvature is greater than the preset curvature value, select mode one; otherwise, select mode two.

[0134] Mode 1 controls the processing volume distribution by changing the mill rotation speed; the mill rotation speed distribution along the processing trajectory is V. m ;

[0135]

[0136] H = k × p × v

[0137] in:

[0138] E represents the distribution of the quantity to be processed;

[0139] H represents the instantaneous material removal rate of the optical element to be processed at a certain point on the trajectory of the mill mounted on the system;

[0140] k is a constant coefficient related to time, temperature, and the abrasive being processed;

[0141] p represents the normalized distribution of contact pressure in the contact area between the machining tool and the surface of the optical element to be processed;

[0142] v represents the normalized distribution of the relative motion velocity between the machining tool and the contact surface of the optical element to be processed;

[0143] This is a deconvolution operation;

[0144] k m1 These are constant coefficients related to the mill parameters;

[0145] Mode 2 controls the processing volume distribution by changing the mill's output pressure; the output pressure distribution along the processing trajectory is P. m ;

[0146]

[0147] in:

[0148] k m2 These are constant coefficients related to the mill parameters.

[0149] In the above technical solution, R0 = (5%~10%)R; t is taken as 3600s.

Claims

1. A mobile polishing system, characterized in that, It includes an external mill mechanism (1), a moving mechanism (2), and an internal mill mechanism (3); The external grinding mill mechanism includes a hollow grinding disc (102), a grinding layer (101) is provided at the bottom of the hollow grinding disc (102), a supporting cylinder (1011) is provided at the top of the hollow grinding disc (102), a bearing (105) is provided at the top of the supporting cylinder (1011), and a cylinder (107) is provided at the top of the bearing (105); a first annular protrusion is provided on the outer edge of the top of the cylinder (107); The top of the cylinder (107) is provided with an external grinding mill frame (108), and an annular cavity (1012) is opened at the bottom outer edge of the external grinding mill frame (108). The top of the cylinder (107) is located in the annular cavity (1012), and a first compression spring (1013) is provided between the cylinder (107) and the annular cavity (1012). A first drive motor (106) is provided on the side wall of the cylinder (107). The output shaft of the first drive motor (106) is vertically downward and is fitted with a drive gear (104). A driven gear (103) is fitted on the outer wall of the supporting cylinder (1011). The driven gear (103) meshes with the drive gear (104). The moving mechanism (2) includes a support plate (201) disposed at the bottom of the external mill frame (108), a plurality of motor mounting plates (202) are disposed at the bottom of the support plate (201), a plurality of secondary drive motors (203) are disposed at the bottom of the motor mounting plates (202), and the secondary drive motors (203) are provided with omnidirectional moving wheels (204). The internal grinding mechanism (3) includes a support block (301) fixed to the bottom of the support plate (201). The bottom of the support block (301) is provided with a cavity (306). A thrust block (302) is provided in the cavity (306). The bottom of the thrust block (302) extends out of the cavity (306) and is equipped with a third drive motor (304). The end of the output shaft of the third drive motor (304) is fitted with an internal grinding disc (303). The bottom of the internal grinding disc (303) is provided with an internal grinding layer (305). A second compression spring (307) is provided between the cavity (306) and the thrust block (302). The omnidirectional moving wheel (204) is located between the hollow grinding disc (102) and the inner grinding disc (303); by setting the rotation direction of the inner and outer grinding machines, the rotational inertia of the two can be canceled out.

2. The mobile polishing system as described in claim 1, characterized in that, The bottom outer edge of the cylinder (107) is provided with a second annular protrusion, which is bolted to the outer ring of the bearing (105).

3. The mobile polishing system as described in claim 1, characterized in that, The supporting cylinder (1011) is fixedly connected to the driven gear (103) and the inner ring of the bearing (105) through a flange structure.

4. The mobile polishing system as described in claim 1, characterized in that, The support plate (201) and the external mill frame (108) are connected by bolts.

5. The mobile polishing system as described in claim 1, characterized in that, The top center of the external grinding mill frame (108) has a groove, in which a mobile power supply (1010) is installed. The mobile power supply (1010) is electrically connected to the first drive motor (106), the second drive motor (203), and the third drive motor (304), respectively.

6. The mobile polishing system as described in claim 1, characterized in that, A controller (109) is provided on the top outer side of the external grinding mill frame (108), and the controller (109) is electrically connected to the first drive motor (106), the second drive motor (203) and the third drive motor (304) respectively.

7. The mobile polishing system as described in claim 1, characterized in that, The support plate (201) and the support block (301) are connected by a flange structure.

8. The mobile polishing system as described in claim 1, characterized in that, The material of the grinding layer (101) or the internal grinding layer (305) is an elastic grinding layer or a non-fluid Newtonian grinding layer.

9. A method for controlling the fabrication of optical components, characterized in that, The mobile polishing system according to any one of claims 1 to 8 specifically includes the following steps: Step 1: Detect the surface shape of the optical element to be processed, subtract the obtained surface shape from the target surface shape to obtain the processing quantity distribution E, and use auxiliary tools to fix the optical element to be processed. Step 2: Determine the processing parameters; The processing parameters include the outer diameter of the mobile polishing system. Non-processing trajectory, preset processing trajectory, number of mobile polishing systems N, number of processing times per mobile polishing system n, speed distribution Vt of the mobile polishing system on the processing trajectory, and processing mode; The preset processing trajectory is an equidistant grating type; The maximum approximate circle diameter of the preset machining trajectory is The interval between adjacent rows is ; Step 3: Input the mill rotation speed distribution Vt, processing mode, and number of processing times n of each mobile polishing system on the processing trajectory obtained in Step 2 into each mobile polishing system, and number the mobile polishing systems performing the processing tasks sequentially to determine the processing order. Step 4: The i-th mobile polishing system starts from the equipment waiting area and moves to the processing waiting area along the non-processing trajectory according to the processing sequence. After entering the preset processing trajectory from the processing waiting area, it performs the j-th processing on the surface of the optical element to be processed. The value of i ranges from 1, 2, 3, ..., N. Step 5: After the i-th mobile polishing system enters the preset processing trajectory, it starts from the waiting area along the non-processing trajectory and enters the processing waiting area. When the i-th mobile polishing system processes to the M-th row of the preset processing trajectory, it enters the preset processing trajectory from the processing waiting area and starts working. Step 6: After all mobile polishing systems complete the j-th processing according to the preset processing trajectory, they return to the equipment waiting area in sequence according to the non-processing trajectory. Step 7: Let j = j + 1, and determine whether j > n. If yes, all mobile polishing systems will stop and proceed to step 8; otherwise, return to step 4. Step 8: Remove the auxiliary fixtures, clean the optical components to be processed, and inspect the surface shape.

10. The optical element processing control method as described in claim 9, characterized in that, Step two specifically includes the following steps: Step 2.1, based on the maximum approximate circular diameter of the optical element to be processed. Determine the outer diameter of the mobile polishing system ; Step 2.2: Determine the number N of mobile polishing systems and the number of processing times n for each mobile polishing system according to the following formula; n≈ in: t is the time required for each mobile polishing system to traverse the preset processing trajectory once; n is a positive integer; Step 2.3: The center of the maximum approximate circle of the preset processing trajectory is the origin, the direction parallel to the direction of the trajectory grating is the x-axis, and the direction perpendicular to the direction of the trajectory grating is the y-axis. A coordinate system is established to obtain the velocity distribution Vt of the moving polishing system on the processing trajectory. in: y represents the distance between the centroid O of the mobile polishing system and the x-axis. ; Step 2.4: Select the processing mode according to the curvature of the optical element to be processed. If the radius of curvature is greater than the preset curvature value, select mode one; otherwise, select mode two. Mode 1 controls the processing volume distribution by changing the mill rotation speed; the mill rotation speed distribution along the processing trajectory is as follows: ; in: E represents the distribution of the quantity to be processed; H represents the instantaneous material removal rate of the optical element to be processed at a certain point on the trajectory of the mill mounted on the system; k is a constant coefficient related to time, temperature, and the abrasive being processed; p represents the normalized distribution of contact pressure in the contact area between the machining tool and the surface of the optical element to be processed; v represents the normalized distribution of the relative motion velocity between the machining tool and the contact surface of the optical element to be processed; This is a deconvolution operation; k m1 These are constant coefficients related to the mill parameters; Mode 2 controls the processing volume distribution by changing the mill's output pressure; the output pressure distribution along the processing trajectory is as follows: ; in: k m2 These are constant coefficients related to the mill parameters.

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