A PPG spherical lens processing technology

Abstract

The application discloses a PPG spherical lens processing technology and belongs to the technical field of core taking grinding, which comprises the following steps: S1, incoming material cleaning; S2, plane grinding of the PPG spherical lens; S3, plane cleaning of the PPG spherical lens; S4, plane polishing of the PPG spherical lens; S5, plane polishing cleaning; S6, semi-finished product inspection; S7, convex surface roughening of the PPG spherical lens; S8, convex surface fine grinding of the PPG spherical lens; S9, convex surface polishing of the PPG spherical lens; and S10, core taking of the PPG spherical lens, wherein the core taking is performed through a processing device. The application can take into account the protection of the spherical lens and the coaxial positioning precision of the spherical lens.

Description

Technical Field

[0001] This application belongs to the field of core grinding technology and relates to a PPG spherical lens processing technology. Background Technology

[0002] PPG spherical lenses are classified into biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and meniscus lenses. In multi-lens systems, multiple lenses need to be coaxial, therefore, core extraction is required during lens processing.

[0003] Core extraction is performed by using two clamps to hold the two sides of the lens respectively. The geometric axes (rotation axes) of the two clamps coincide, and the axes of the clamps coincide with the optical axes of the curvature centers of the two sides of the lens. The clamps drive the lens to rotate along its own optical axis. Then, the outer circle of the lens is ground with a grinding wheel so that the axis of the outer circle of the lens coincides with the optical axes of the curvature centers of the two sides of the lens.

[0004] Therefore, the outer circle of the lens can serve as the mounting reference surface for assembling a multi-lens system, ensuring that the optical axes of each lens are aligned and achieving coaxiality as a lens system.

[0005] The most important aspect of lens core processing is the coaxial positioning between the fixture and the lens. Taking a plano-convex lens as an example (one side is flat, the other is convex), one fixture has a flat mating surface, and the other fixture has a concave mating surface. The two fixtures apply axial clamping pressure to the plano-convex lens under the axial force of a spring or cylinder. The position of the lens is corrected by the contact and engagement of the two sides of the lens by the fixtures. The existing technology is rigid clamping, which allows the lens to adaptively adjust to a coaxial positioning state. The advantage is that the clamping and positioning stability is strong, which can effectively resist the radial grinding force of the grinding wheel and is not easy to shift. However, with rigid clamping, during the adaptive adjustment of the lens, there is a large relative displacement between the lens and the fixture mating surface, and the clamping force is large, which can easily lead to damage to the lens surface. Summary of the Invention

[0006] In order to balance the protection of spherical lenses and the coaxial positioning accuracy of spherical lenses, this application provides a PPG spherical lens processing technology.

[0007] This application provides a PPG spherical lens processing technology, which is implemented using the following technical solution: A PPG spherical lens processing technology includes the following steps: S1, incoming material cleaning; S2, planar grinding of the PPG spherical lens; S3, planar cleaning of the PPG spherical lens; S4, planar polishing of the PPG spherical lens; S5, planar polishing and cleaning; S6, semi-finished product inspection; S7, roughing of the convex surface of the PPG spherical lens; S8, fine grinding of the convex surface of the PPG spherical lens; S9, convex polishing of the PPG spherical lens; S10, core extraction of the PPG spherical lens: core extraction is performed using a processing device, which includes a grinding wheel, an upper shaft, an upper clamp, a lower shaft, a lower clamp, and a locking assembly. The lower clamp is fixed to the lower shaft and has a lower mating surface for engaging with the convex surface of the lens. The upper clamp slides axially with the upper shaft and is anti-rotationally engaged. The fixture has an upper mating surface for engaging with the lens plane, and the lower mating surface of the lower fixture has at least eight vertically arranged grooves, each groove being evenly distributed around its circumference. Positioning balls are elastically fitted within the grooves. During core removal, the convex surface of the lens abuts against the positioning balls. The upper fixture moves downward, and the upper mating surface of the upper fixture moves the lens downward by abutting against the lens plane. The positioning balls abut against the upper mating surface to correct the lens position, ensuring the lens is coaxial with both the upper and lower shafts. The lens continues to move downward until its convex surface is in contact with the lower mating surface. During this process, the positioning balls are pressed down until they are completely within the grooves. The upper fixture is then fixed by a locking assembly to achieve rigid clamping. The lower shaft rotates the lens, and a grinding wheel moves radially towards the outer circumference of the lens to perform core removal grinding on the outer circumference.

[0008] Through the above technical solution, during the core-taking process, the convex surface of the lens abuts against each positioning ball. The upper clamp moves downwards, and the upper mating surface of the upper clamp abuts against the plane of the lens, causing the lens to move downwards. That is, the upper clamp and each positioning ball apply clamping force to the lens. The elastic pressure of each positioning ball is the same, allowing the lens to adaptively adjust its position under the action of flexible clamping force. Because it is flexible clamping and there is sliding friction between the positioning balls and the lens, even if the lens undergoes large relative displacement, the damage to the lens surface is minimal. Furthermore, after flexible clamping, the lens is essentially in a stable condition. In a coaxial state, the upper clamp presses down, causing the lens to continue moving downwards until the convex surface of the lens is in contact with the lower mating surface. During this process, the positioning ball is pressed down and moves completely into the groove. Then, the upper clamp is fixed by the locking assembly. At this time, the upper clamp and the lower clamp hold the flat and convex surfaces of the lens respectively. Even if the lens may have a small displacement to adjust its coaxial position, the relatively small displacement can greatly reduce its own damage. Secondly, this clamping method is a rigid clamping method, which makes the lens more stable and can effectively resist the radial grinding force of the grinding wheel, making it less likely to shift.

[0009] In summary, by implementing the clamping process in stages, firstly, flexible sliding clamping is used to give the lens sufficient displacement time and space, allowing the lens to make large relative displacements to adapt and adjust its own positioning state, reducing the probability of damage. Then, combined with rigid clamping, the coaxial positioning of the lens is finally completed. At the same time, the lens has strong stability and can effectively resist the radial grinding force of the grinding wheel, making it less prone to displacement.

[0010] Optionally, the following steps may also be included: S11, fine polishing of the convex surface of the PPG spherical lens; S12, fine polishing of the flat surface of the PPG spherical lens; S13, ultrasonic cleaning; S14, finished product inspection; S15, packaging.

[0011] Optionally, in step S13, the cleaning solution ratio is 1200-1500ml of cleaning agent / 50kg of water, the cleaning solution is ultrasonically heated to 35℃-50℃, and the cleaning is performed for 4-6 minutes.

[0012] Optionally, both the upper and lower clamps are cylindrical, and the outer diameter edges of the upper and lower mating surfaces have a chamfer-rounded-chamfer transition surface; a first spring is provided in the slide groove, the inner diameter of the slide groove is equal to the diameter of the positioning ball, and the two ends of the first spring abut against the bottom of the slide groove and the bottom of the positioning ball, respectively. When the first spring is not compressed, the positioning ball is higher than the lower mating surface.

[0013] Optionally, the locking assembly includes a locking cylinder that is threadedly engaged with the upper shaft body, and the lower end face of the locking cylinder is used to abut against the upper end face of the upper clamp.

[0014] Optionally, a second spring is also included. The inner top surface of the locking cylinder has an upper conical surface, and the upper end surface of the upper clamp has a lower conical surface. The two ends of the second spring abut against the upper and lower conical surfaces, respectively. During the core removal process, the convex surface of the lens abuts against each positioning ball. The upper clamp moves down, and the upper mating surface of the upper clamp moves the lens down by abutting against the plane of the lens. The abutment between the positioning ball and the upper mating surface initially corrects the position of the lens, which is the first repositioning. Then, the locking cylinder is rotated to move it down, and the second spring is compressed. The elastic force of the second spring forces the upper clamp to move down, and the positioning ball moves down. The first spring is compressed, and the double elastic clamping continues to correct the position of the lens. The lens continues to move down until the convex surface of the lens is in contact with the lower mating surface. During this period, the positioning ball is pressed down and moves down until it is completely located in the slide groove, which is the second repositioning. Finally, the locking cylinder is rotated until the lower end surface of the locking cylinder abuts against the upper end surface of the upper clamp, achieving rigid clamping, which is the third repositioning.

[0015] Optionally, it also includes an adsorption and fixing component, which includes a suction cup, a clamping ring, and a negative pressure structure. The clamping ring is coaxially fixed to the outer edge of the suction cup and coaxially fixed to the lower clamp. When the convex surface of the lens is in contact with the lower mating surface, the upper surface of the suction cup is in contact with the convex surface of the lens, the outer periphery of the suction cup is elastically compressed, and the negative pressure structure generates a negative pressure between the suction cup and the convex surface of the lens, so that the suction cup adsorbs the convex surface of the lens.

[0016] Optionally, the adsorption and fixing assembly further includes a sliding cylinder, a steel pipe, a third spring, and a tightening sleeve. The sliding cylinder is axially slidingly fitted with the inner wall of the lower clamp. The steel pipe is coaxially fixed with the sliding cylinder. A cylindrical extension is integrally formed in the middle of the lower surface of the suction cup. The steel pipe is slidably sleeved on the outside of the extension. Multiple elastic skeletons extend radially outward from the upper end of the steel pipe. The elastic skeletons are embedded in the suction cup. The sliding cylinder is fixed with a support plate extending to the outside of the lower clamp. The tightening sleeve is threaded on the outside of the lower clamp. The upper and lower ends of the third spring abut against the lower end of the tightening sleeve and the upper surface of the support plate, respectively.

[0017] Optionally, the length of the elastic skeleton is greater than one-third and less than two-thirds of the suction cup radius.

[0018] The beneficial effects of this application are: 1. By implementing the clamping in steps, firstly, flexible sliding clamping is used to give the lens sufficient displacement time and space, allowing the lens to make large relative displacements to adapt and adjust its own positioning state, reducing the probability of damage. Then, combined with rigid clamping, the coaxial positioning of the lens is finally completed. At the same time, the lens has strong stability and can effectively resist the radial grinding force of the grinding wheel, making it less prone to displacement. Attached Figure Description

[0019] Figure 1 This is a process flow diagram of Example 1.

[0020] Figure 2 This is a schematic diagram of the processing apparatus of Example 1.

[0021] Figure 3 This is a cross-sectional view of the upper and lower clamps of Embodiment 1.

[0022] Figure 4 This is a schematic diagram of the positioning ball in the exposed state in Example 1.

[0023] Figure 5 yes Figure 3 A magnified view of a portion of point A in the middle.

[0024] Figure 6 This is a cross-sectional view of the upper and lower clamps of Embodiment 2.

[0025] Figure 7 This is a cross-sectional view of the upper and lower clamps of Embodiment 3.

[0026] Figure 8 This is a cross-sectional view of the upper and lower clamps of Embodiment 4.

[0027] Figure 9 yes Figure 8 A magnified view of a section at point B in the middle.

[0028] Explanation of reference numerals in the attached drawings: 1. Lower clamp; 2. Upper clamp; 10. Lower mating surface; 100. Frame; 101. Spindle box; 102. Base; 103. Grinding wheel; 105. Lens; 106. Chamfer; 107. Rounded corner; 11. Lower shaft; 111. Air passage; 12. Positioning ball; 121. First spring; 122. Slide groove; 13. Clearance groove; 20. Upper mating surface; 21. Upper shaft; 211. Keyway; 22. Sliding sleeve; 221. Key block; 23. Locking cylinder; 231. Upper conical surface; 232. Lower conical surface; 233. Second spring; 31. Suction cup; 311. Extension; 32. Pressing ring; 33. First connecting ring plate; 34. Connecting pipe; 35. Rotary joint; 351. Ring groove; 352. Air hole; 36. Air pipe; 37. Tightening sleeve; 38. Third spring; 39. Steel pipe; 391. Second connecting ring plate; 392. Sliding cylinder; 393. Support plate; 395. Elastic frame. Detailed Implementation

[0029] The embodiments of this application are described in detail below, and examples of the embodiments are provided in the appendix. Figures 1-9 As shown in the image.

[0030] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] Example 1 Example 1 discloses a PPG spherical lens processing technology, mainly for the processing of plano-convex lenses 105, such as... Figure 1 As shown, the PPG spherical lens manufacturing process includes the following steps: S1. Incoming material cleaning.

[0032] S2, PPG spherical lens 105 surface grinding.

[0033] S3, PPG spherical lens 105 flat surface cleaning.

[0034] S4, PPG spherical lens 105 flat polishing.

[0035] S5, Surface polishing and cleaning.

[0036] S6. Inspection of semi-finished products.

[0037] S7, PPG spherical lens 105 with coarse convex surface.

[0038] S8, PPG spherical lens 105 convex surface fine grinding.

[0039] S9, PPG spherical lens 105 convex polishing.

[0040] Core extraction of S10 and PPG spherical lens 105: Core extraction is performed using a processing device. When clamping and positioning the lens 105, a flexible sliding clamp is first used to give the lens 105 sufficient displacement time and space, allowing the lens 105 to make large relative displacements to adapt and adjust its own positioning state, reducing the probability of damage. Then, combined with rigid clamping, the coaxial positioning of the lens 105 is finally completed. Finally, the outer circle of the lens 105 is ground using a grinding wheel 103 for core extraction. S11, PPG spherical lens 105 convex surface fine polishing.

[0041] S12, PPG spherical lens 105 flat polishing.

[0042] S13. Ultrasonic cleaning: The cleaning solution ratio is 1200-1500ml of cleaning agent / 50kg of water. The cleaning solution is ultrasonically heated to 35℃-50℃ and cleaned for 4-6 minutes.

[0043] S14. Finished product inspection.

[0044] S15. Packaging.

[0045] Example 1 also discloses the processing apparatus used in the above process, such as... Figure 2 , Figure 3 As shown, the processing device includes a frame 100, a spindle box 101, a base 102, a grinding wheel 103, an upper spindle body 21, an upper clamp 2, a lower spindle body 11, a lower clamp 1, and a locking assembly, wherein the spindle box 101 is fixed to the lower part of the frame 100, and the base 102 is fixed to the upper part of the frame 100.

[0046] The lower shaft 11 is coaxially fixed to the output end of the main shaft box 101. The lower clamp 1 is cylindrical, and its lower end is coaxially fixed to the upper end of the lower shaft 11. The upper end face of the lower clamp 1 is provided as a lower mating surface 10 for engaging with the convex surface of the lens 105. The lower mating surface 10 of the lower clamp 1 has at least eight vertically arranged sliding grooves 122. Each sliding groove 122 is evenly arranged around the circumference of the axis of the lower clamp 1. A positioning ball 12 slides and engages within the sliding groove 122. The inner diameter of groove 122 is equal to the diameter of positioning ball 12. Positioning ball 12 can be made of metal or plastic. The sliding direction of positioning ball 12 and groove 122 is parallel to the axial direction of lower clamp 1. First springs 121 are provided in groove 122. The elastic force of each first spring 121 is the same. The two ends of the first spring 121 abut against the bottom of groove 122 and the bottom of positioning ball 12, respectively. When the first spring 121 is not compressed, positioning ball 12 is higher than lower mating surface 10 (see...). Figure 4 ).

[0047] The upper shaft 21 and the lower shaft 11 are coaxially arranged. The upper shaft 21 is rotatably engaged with the base 102. The lower clamp 1 is cylindrical. The upper clamp 2 slides axially with the upper shaft 21 and is anti-rotationally engaged. Specifically, the upper clamp 2 has an integrally formed sliding sleeve 22 in the middle. The sliding sleeve 22 is slidably fitted on the lower part of the upper shaft 21. The outer circumferential surface of the upper shaft 21 is provided with a vertically arranged keyway 211. The inner wall of the sliding sleeve 22 is provided with a key block 221 that mates with the keyway 211.

[0048] The lower end face of the upper clamp 2 is set as an upper mating surface 20 for mating with the plane of the lens 105.

[0049] The locking assembly includes a locking cylinder 23, which is higher than the upper clamp 2. The locking cylinder 23 is threadedly engaged with the upper shaft 21, and the lower end face of the locking cylinder 23 is used to abut against the upper end face of the upper clamp 2.

[0050] During the core-taking process, the lens 105 is placed on the lower clamp 1. At this time, the positioning balls 12 are higher than the lower mating surface 10, and the convex surface of the lens 105 abuts against each positioning ball 12. Then, the upper clamp 2 is moved down, and the upper mating surface 20 of the upper clamp 2 moves the lens 105 down by abutting against the plane of the lens 105. That is, the upper clamp 2 and each positioning ball 12 apply clamping force to the lens 105 respectively. The elastic pressure of each positioning ball 12 is the same, so that the lens 105 adaptively adjusts its position under the action of flexible clamping force. Since it is flexible clamping and there is sliding friction between the positioning balls 12 and the lens 105, even if the lens 105 undergoes a large relative displacement, the damage to the surface of the lens 105 is small. After flexible clamping, the lens 105 is also basically in a coaxial state (considering the first elastic force corresponding to each positioning ball 12). The spring force of spring 121 cannot be completely consistent and there is a certain small error. Therefore, the lens 105 cannot be completely positioned and can only be initially positioned. Then, the upper clamp 2 presses down and drives the lens 105 to continue to move down until the convex surface of the lens 105 is in contact with the lower mating surface 10. During this period, the positioning ball 12 is pressed down and moves down until it is completely located in the slide groove 122. Then, by rotating the locking cylinder 23, the lower end face of the locking cylinder 23 abuts against the upper end face of the upper clamp 2. At this time, the upper clamp 2 and the lower clamp 1 respectively clamp the flat surface and the convex surface of the lens 105. Even if the lens 105 may have a small displacement to adjust its coaxial position, the relative displacement is small and can greatly reduce its own damage. Secondly, this clamping form is a rigid clamping, and the stability of the lens 105 is strong. It can effectively resist the radial grinding force of the grinding wheel 103 and is not easy to move out of position.

[0051] The torque of the spindle box 101 drives the shaft 11 to rotate the lens 105, and the grinding wheel 103 approaches the outer circle of the lens 105 radially to perform grinding core removal on the outer circle of the lens 105.

[0052] Furthermore, to reduce scratches during the 105mm adaptive adjustment of the lens, the following settings were also implemented, such as... Figure 5 As shown, the outer diameter edges of the upper mating surface 20 and the lower mating surface 10 both have transition surfaces with chamfer 106-round corner 107-chamfer 106, which greatly reduces the generation of edge stress.

[0053] Example 2 The difference between Example 2 and Example 1 is that, as Figure 6 As shown, the processing device also includes a second spring 233, which is located outside the sliding sleeve 22. The inner top surface of the locking cylinder 23 has an upper conical surface 231, the inner diameter of which gradually increases from top to bottom. The upper end surface of the upper clamp 2 has a lower conical surface 232, the inner diameter of which gradually decreases from top to bottom. The two ends of the second spring 233 abut against the upper conical surface 231 and the lower conical surface 232, respectively.

[0054] During the core removal process, the convex surface of the lens 105 abuts against each positioning ball 12. The upper clamp 2 is manually moved downwards, and the upper mating surface 20 of the upper clamp 2 moves the lens 105 downwards by abutting against the plane of the lens 105. The abutment between the positioning balls 12 and the upper mating surface 20 initially corrects the position of the lens 105; this is the first repositioning. Then, the locking cylinder 23 is rotated to move it downwards, compressing the second spring 233. The elastic force of the second spring 233 is greater than that of the first spring 121, and the elastic force of the second spring 233 forces... The upper clamp 2 is moved down, the first spring 121 is compressed, and the positioning ball 12 moves down. In this way, the position of the lens 105 will continue to be corrected under the double elastic clamping, so that the lens 105 continues to move down until the convex surface of the lens 105 is in contact with the lower mating surface 10. During this period, the positioning ball 12 is pressed down and moves down until it is completely located in the slide groove 122. This is the second positioning. Finally, the locking cylinder 23 is rotated until the lower end face of the locking cylinder 23 abuts against the upper end face of the upper clamp 2 to achieve rigid clamping. This is the third positioning.

[0055] The implementation principle of Example 2 is as follows: the elastic force of the second spring 233 is applied to the locking cylinder 23 and the upper clamp 2 respectively. This elastic force can reduce the thread fit gap between the locking cylinder 23 and the upper shaft 21, thereby improving the contact stability of the locking cylinder 23. This elastic force is applied to the lens 105 through the upper clamp 2, which can provide a certain preload and improve the clamping stability of the lens 105.

[0056] Secondly, through triple positioning, from single elastic clamping to double elastic clamping and then to rigid clamping, that is, by using multiple sequential positioning adjustments, the positioning state of lens 105 is gradually adjusted with time sequence and increasing positioning force, thereby improving positioning accuracy.

[0057] Example 3 The difference between Example 3 and Example 1 or Example 2 is that, as Figure 7 As shown, the processing device also includes an adsorption and fixing assembly, which includes a suction cup 31, a clamping ring 32, and a negative pressure structure. The clamping ring 32 is coaxially fixed to the outer edge of the suction cup 31. The suction cup 31 and the clamping ring 32 are located in the inner cavity of the lower clamp 1. The clamping ring 32 is coaxially arranged with the lower clamp 1. The inner wall of the lower clamp 1 is integrally formed with a first connecting ring plate 33. The first connecting ring plate 33 is fixedly connected to the clamping ring 32 to maintain the coaxial position of the suction cup 31.

[0058] The negative pressure structure is used to generate negative pressure between the suction cup 31 and the convex surface of the lens 105. Specifically, the negative pressure structure includes a connecting pipe 34, a rotary joint 35, and an air pump (not shown in the figure). The lower shaft 11 is provided with an air passage 111. The rotary joint 35 is rotatably sleeved on the outside of the lower shaft 11. The inner diameter of the rotary joint 35 is provided with an annular groove 351. The outer diameter of the rotary joint 35 is provided with an air hole 352 that communicates with the annular groove 351. The air hole 352 is connected to the air pump through an air pipe 36. The annular groove 351 is connected to the air outlet of the air passage 111. The air inlet of the air passage 111 is connected to the middle of the suction cup 31 through the connecting pipe 34. The connecting pipe 34 is a flexible hose or a telescopic tube.

[0059] When the lens 105 moves down until its convex surface fits against the lower mating surface 10, the locking cylinder 23 abuts against the upper clamp 2, and the upper surface of the suction cup 31 fits against the convex surface of the lens 105. The outer periphery of the suction cup 31 is abutted and elastically compressed to ensure edge sealing. Then the air pump is started, and the air in the suction cup 31 is sequentially drawn out from the connecting pipe 34, air passage 111, annular groove 351, air hole 352 and air tube 36, so that the suction cup 31 can be negatively adsorbed onto the convex surface of the lens 105. Furthermore, by setting the rotary joint 35, the lower shaft 11 will not interfere with the position of the air tube 36 during rotation, so as to ensure the stability of the negative pressure maintenance.

[0060] In this way, the radial grinding force of the grinding wheel 103 is applied to the outer circle of the lens 105, and the radial force on the lens 105 is applied to the lower clamp 1 through the suction cup 31 and the first connecting ring plate 33. The lower clamp 1 can effectively resist the radial grinding force of the grinding wheel 103, thereby greatly improving the radial force resistance of the lens 105, greatly reducing the displacement of the lens 105, and thus greatly improving the core taking processing accuracy.

[0061] Example 4 The difference between Example 4 and Example 3 is that, as Figure 8 , Figure 9 As shown, the adsorption and fixing assembly also includes a sliding cylinder 392, a steel pipe 39, a third spring 38, and a tightening sleeve 37. The outer circumferential surface of the sliding cylinder 392 is axially slidingly engaged with the inner wall of the lower clamp 1. The steel pipe 39 is coaxially arranged with the lower clamp 1. The outer wall of the steel pipe 39 is fixedly connected to the inner wall of the sliding cylinder 392 through a second connecting ring plate 391.

[0062] A cylindrical extension 311 is integrally formed in the middle of the lower surface of the suction cup 31. The extension 311 extends axially along the lower clamp 1. The steel tube 39 is slidably sleeved on the outside of the extension 311. Multiple elastic skeletons 395 extend radially outward from the upper end of the steel tube 39. The elastic skeletons 395 are long strips and each elastic skeleton 395 is radial. The elastic skeletons 395 are embedded in the suction cup 31. Specifically, the embedded position of the elastic skeleton 395 is far away from the upper surface of the suction cup 31, and the length of the elastic skeleton 395 is greater than one-third of the radius of the suction cup 31 and less than two-thirds of the radius of the suction cup 31. In this embodiment, the length of the elastic skeleton 395 is half the radius of the suction cup 31.

[0063] The lower clamp 1 has a vertically arranged clearance groove 13 through it. The lower end of the sliding cylinder 392 is fixed with a radially extending support plate 393. There are at least two support plates 393. The support plates 393 pass through the clearance groove 13 and are located on the outside of the lower clamp 1. The tightening sleeve 37 is threaded on the outside of the lower clamp 1. The third spring 38 is sleeved on the outside of the lower clamp 1. The upper end and lower end of the third spring 38 abut against the lower end of the tightening sleeve 37 and the upper surface of the support plate 393, respectively.

[0064] During the positioning of lens 105, the third spring 38 is in an uncompressed state. When lens 105 moves down until its convex surface fits against the lower mating surface 10, locking cylinder 23 abuts against upper clamp 2, and the upper surface of suction cup 31 fits against the convex surface of lens 105. The outer periphery of suction cup 31 is abutted and elastically compressed. Then the air pump is started, so that suction cup 31 can be negatively pressure adsorbed onto the convex surface of lens 105. Finally, the tightening sleeve 37 is rotated, the tightening sleeve 37 moves down, and the third spring 38 is compressed. The elastic force of the third spring 38 is applied to the convex surface of lens 105 through the support plate 393, the second connecting ring plate 391, the steel pipe 39, the elastic frame 395, and the middle of suction cup 31 in sequence, which forces the convex surface of lens 105 to move further down to fit against the lower mating surface 10.

[0065] Compared to existing methods that increase clamping force to improve clamping effect, this embodiment utilizes unidirectional adhesion force to improve the positional stability of the lens 105. This offers two main advantages over existing technologies: 1. In this embodiment, the lens 105 experiences enhanced unidirectional adhesion force, while existing technologies enhance both bidirectional clamping forces (due to the reciprocity of forces, when one clamp applies force, both sides of the existing lens 105 experience equal clamping force). In this embodiment, the clamping force on the lens 105 is primarily concentrated on its convex surface, with less clamping force on its flat surface. Therefore, even if the lens 105 in this embodiment is subjected to the maximum radial grinding force of the grinding wheel 103 and becomes misaligned and scratched, the damage is mainly on the convex surface, requiring only minor subsequent repairs. 1. Single-sided repair is sufficient, which improves the controllability of risks; 2. Since the lower mating surface 10 is concave, when the lens 105 is subjected to the maximum radial grinding force of the grinding wheel 103, the lens 105 will have two motion tendency. The first motion tendency is radial, and the second motion tendency is axial. The first motion tendency is resisted by the suction force of the suction cup 31 and the lower clamp 1, while the second motion tendency is resisted by the suction force of the suction cup 31 and the elastic force of the third spring 38. That is, under the premise of convex surface mating and positioning, the motion tendency of the lens 105 is transformed, and the third spring 38, the suction cup 31 and the lower clamp 1 can jointly resist the maximum radial grinding force of the grinding wheel 103, thereby also improving the stability of single-sided mating clamping.

[0066] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A PPG spherical lens processing technology, characterized in that, Includes the following steps: S1. Incoming material cleaning; S2. Planar grinding of PPG spherical lens (105); S3. Planar cleaning of PPG spherical lens (105); S4. Planar polishing of PPG spherical lens (105); S5. Planar polishing and cleaning; S6. Semi-finished product inspection; S7. Convex roughing of PPG spherical lens (105); S8. Convex fine grinding of PPG spherical lens (105); S9. Convex polishing of PPG spherical lens (105); S10. Core taking of PPG spherical lens (105): Core taking is performed by a processing device, which includes a grinding wheel (103), an upper shaft (21), an upper clamp (2), a lower shaft (11), a lower clamp (1), and a locking assembly. The lower clamp (1) and The lower shaft (11) is fixed, and the lower clamp (1) is provided with a lower mating surface (10) for engaging with the convex surface of the lens (105). The upper clamp (2) slides axially with the upper shaft (21) and is anti-rotationally engaged. The upper clamp (2) is provided with an upper mating surface (20) for engaging with the plane of the lens (105). The lower mating surface (10) of the lower clamp (1) is provided with at least 8 vertically arranged sliding grooves (122). Each sliding groove (122) is evenly arranged around the circumference, and a positioning ball (12) is elastically sliding and engaged in the sliding groove (122). During the core removal process, the convex surface of the lens (105) abuts against each positioning ball (12), and the upper clamp (2) moves down. The upper mating surface (20) of the upper clamp (2) moves by abutting against the plane of the lens (105). The lens (105) moves downward, and the position of the lens (105) is corrected by the contact between the positioning ball (12) and the upper mating surface (20), so that the lens (105) is coaxial with the upper shaft (21) and the lower shaft (11) respectively. The lens (105) continues to move downward until the convex surface of the lens (105) is in contact with the lower mating surface (10). During this period, the positioning ball (12) is pressed down and moves down until it is completely located in the slide groove (122). Then, the upper clamp (2) is fixed by the locking assembly to achieve rigid clamping. The lower shaft (11) drives the lens (105) to rotate, and the grinding wheel (103) moves radially closer to the outer circle of the lens (105) to perform grinding and core taking on the outer circle of the lens (105). The upper clamp (2) and the lower clamp (1) are both cylindrical. The outer diameter edges of the upper mating surface (20) and the lower mating surface (10) are both chamfered (106)-rounded (107)-chamfered (106) transition surfaces; a first spring (121) is provided in the slide groove (122), the inner diameter of the slide groove (122) is equal to the diameter of the positioning ball (12), the two ends of the first spring (121) respectively abut against the bottom of the slide groove (122) and the bottom of the positioning ball (12), when the first spring (121) is not compressed, the positioning ball (12) is higher than the lower mating surface (10); the locking assembly includes a locking cylinder (23), the locking cylinder (23) is threadedly engaged with the upper shaft (21), and the lower end face of the locking cylinder (23) is used to abut against the upper end face of the upper clamp (2);It also includes a second spring (233). The inner top surface of the locking cylinder (23) has an upper conical surface (231), and the upper end surface of the upper clamp (2) has a lower conical surface (232). The two ends of the second spring (233) abut against the upper conical surface (231) and the lower conical surface (232) respectively. During the core removal process, the convex surface of the lens (105) abuts against each positioning ball (12), and the upper clamp (2) moves down. The upper mating surface (20) of the upper clamp (2) moves the lens (105) down by abutting against the plane of the lens (105). The position of the lens (105) is initially corrected by the abutment between the positioning ball (12) and the upper mating surface (20). This is the first repositioning. Then, the locking cylinder (23) is rotated to move it downwards, the second spring (233) is compressed, and the elastic force of the second spring (233) forces the upper clamp (2) to move downwards, the positioning ball (12) moves downwards, the first spring (121) is compressed, and the double elastic clamping continues to correct the position of the lens (105). The lens (105) continues to move downwards until the convex surface of the lens (105) is in contact with the lower mating surface (10). During this period, the positioning ball (12) is pressed downwards until it is completely located in the slide groove (122). This is the second repositioning. Finally, the locking cylinder (23) is rotated until the lower end face of the locking cylinder (23) abuts against the upper end face of the upper clamp (2), achieving rigid clamping. This is the third repositioning.

2. The PPG spherical lens processing technology according to claim 1, characterized in that, It also includes the following steps: S11. Fine polishing of the convex surface of PPG spherical lens (105); S12. Fine polishing of the flat surface of PPG spherical lens (105); S13. Ultrasonic cleaning; S14. Finished product inspection; S15. Packaging.

3. The PPG spherical lens processing technology according to claim 2, characterized in that, In step S13, the cleaning solution ratio is 1200-1500ml of cleaning agent / 50kg of water, and the cleaning solution is ultrasonically heated to 35℃-50℃ for 4-6 minutes.

4. The PPG spherical lens processing technology according to claim 1, characterized in that, It also includes an adsorption and fixing component, which includes a suction cup (31), a clamping ring (32) and a negative pressure structure. The clamping ring (32) is coaxially fixed to the outer edge of the suction cup (31) and coaxially fixed to the lower clamp (1). When the convex surface of the lens (105) is in contact with the lower mating surface (10), the upper surface of the suction cup (31) is in contact with the convex surface of the lens (105), and the outer periphery of the suction cup (31) is elastically compressed. The negative pressure structure generates a negative pressure between the suction cup (31) and the convex surface of the lens (105), and the suction cup (31) adsorbs the convex surface of the lens (105).

5. The PPG spherical lens processing technology according to claim 4, characterized in that, The adsorption and fixing assembly also includes a sliding cylinder (392), a steel pipe (39), a third spring (38), and a tightening sleeve (37). The sliding cylinder (392) is axially slidingly fitted with the inner wall of the lower clamp (1). The steel pipe (39) is coaxially fixed with the sliding cylinder (392). A cylindrical extension (311) is integrally formed in the middle of the lower surface of the suction cup (31). The steel pipe (39) is slidably sleeved on the outside of the extension (311). The upper end of the steel pipe (39) has multiple elastic skeletons (395) extending radially outward, and the elastic skeletons (395) are embedded in the suction cup (31); the sliding cylinder (392) is fixed with a support plate (393) extending to the outside of the lower clamp (1), the tightening sleeve (37) is threaded on the outside of the lower clamp (1), and the upper and lower ends of the third spring (38) abut against the lower end of the tightening sleeve (37) and the upper surface of the support plate (393), respectively.

6. The PPG spherical lens processing technology according to claim 5, characterized in that, The length of the elastic skeleton (395) is greater than one-third of the radius of the suction cup (31) and less than two-thirds of the radius of the suction cup (31).

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