High-precision caliber machining control method and machining device for concave lens

Abstract

The invention discloses a high-precision caliber processing control method and processing device for a concave lens, and the method comprises the steps: measuring the data of an incoming lens, determining a corresponding rise deviation through the deviation between the concave curvature of the incoming lens and the standard curvature, and calculating the corresponding rise through the target caliber size of the lens. On the basis of the rise and the center thickness of the lens, the grinding amount of the step surface of the lens is confirmed, machining of different lens calibers is achieved by controlling the rise, and the simple and reliable high-precision thickness measuring device and method accurately and rapidly complete high-precision machining and measurement of the calibers of finished lens products.

Description

Technical Field

[0001] The present invention relates to the technical field of concave lens processing, and particularly relates to a high-precision aperture processing control method and processing device for a concave lens. Background Art

[0002] In a lens device system, there are usually different types of concave lenses to adapt to the optical system. Especially in the application of a laser system, the concave aperture of the optical element needs to match the size of the laser beam to ensure effective light reception, transmission, and focusing. A mismatched aperture can lead to a decline in beam quality. At the same time, the size of the lens aperture also determines the shape accuracy of the lens itself, and the matching accuracy with other structures plays a very important role in the entire device. Especially in an environment with high-frequency vibrations and large temperature differences, to ensure the stability of the optical transmission system in the entire device system, the concave aperture of the lens, which affects the structural accuracy of the lens, is crucial for the stability of the entire device system.

[0003] Currently, for the processing of the aperture size of a concave lens, it is mainly achieved by controlling the raw material size and the concave curvature of grinding. However, there will be a deviation between the processed concave curvature and the standard curvature during lens design, resulting in the inability to unify the aperture of the finished lens and unable to fully meet the aperture accuracy requirements of the lens, which affects the performance of the equipment where the lens is located. At the same time, in the prior art, the measurement of the lens aperture uses a projector for measurement, and its measurement error is relatively large, generally about 0.05 mm. Using a higher-precision measurement device is too costly and cannot meet the detection requirements for batch processing of lenses. Summary of the Invention

[0004] Technical Objective: Aiming at the deficiencies in the existing precision control of concave lens aperture processing, the present invention discloses a high-precision aperture processing control method and processing device for a concave lens that can avoid the influence of curvature processing deviation on the lens aperture size, achieve high-precision aperture processing, and is easy to measure and control.

[0005] Technical Solution: To achieve the above technical objective, the present invention adopts the following technical solutions: A high-precision aperture processing control method for a concave lens, comprising the steps of: S01. Measure the concave curvature, central thickness, and total height of the incoming lens to obtain the data of the incoming lens; S02. Obtain the curvature deviation based on the measured concave curvature and the standard curvature of the incoming lens processing, and confirm the sagitta deviation caused by the curvature deviation. The sagitta is the vertical distance between the center of the concave surface of the lens and the step surface of the lens; S03. Then, according to the target aperture size of the incoming lens and the measured concave curvature, calculate the sagitta corresponding to the target aperture size, where the target aperture size is the designed aperture for lens processing; S04. Determine the final total height of the lens based on the sagitta corresponding to the target aperture size, the sagitta deviation caused by the curvature deviation, and the target center thickness of the incoming lens, and grind the incoming lens according to the obtained total height of the lens and the measured total height and center thickness of the incoming lens; the target center thickness is the designed center thickness for lens processing.

[0006] Preferably, in step S02 of the present invention, a fixed tube with a fixed diameter is used for concentric positioning of the concave and flat surfaces of the incoming lens, and the sagitta deviation caused by the curvature deviation of the incoming lens is calculated based on the diameter of the fixed tube. The diameter of the fixed tube is smaller than the target aperture size of the lens; the diameter of the fixed tube is denoted as , the radius of curvature corresponding to the measured concave curvature of the incoming lens is R1, the radius of curvature corresponding to the standard curvature is R2, and the sagitta deviation ; represents the sagitta corresponding to the radius of curvature R2, represents the sagitta corresponding to the radius of curvature R1.

[0007] Preferably, in step S04 of the present invention, the sagitta corresponding to the target aperture size, the sagitta deviation and the target center thickness d are superimposed to obtain the total height of the lens, and the grinding amount of the lens step surface is determined according to the measured center thickness and total height of the incoming lens.

[0008] Preferably, the fixed tube of the present invention is a thin-walled tube. The outer diameter of the fixed tube is used as the calculation reference for the sagitta deviation, and the fixed tube is used as the positioning reference during lens grinding. The position of the lens on the machine tool is positioned through the fixed tube.

[0009] Preferably, the process of positioning the lens through the fixed tube of the present invention includes confirming the distance between the lens step surface and the center of the concave surface of the lens according to the measured center thickness and total height of the incoming lens, and confirming the distance between the end of the fixed tube and the lens step surface through the measured concave curvature of the incoming lens and the diameter of the fixed tube. Finally, the position of the lens step surface of the incoming lens on the machine tool is positioned through the position of the fixed tube on the processing machine tool where it is located.

[0010] The present invention discloses a high-precision aperture processing device for concave lenses, which uses the above processing control method, including an edging machine and a grinding wheel. A lens clamping mechanism parallel to the main shaft where the grinding wheel is located is arranged on the edging machine. When processing the lens, the lens is clamped and fixed through the clamping mechanism, and the grinding wheel is driven by the edging machine to rotate for grinding the lens.

[0011] Preferably, the lens clamping mechanism of the present invention includes two relatively arranged fixed tubes, and the lens is clamped and fixed by contacting the concave and flat surfaces of the lens through the fixed tubes.

[0012] Preferably, the fixed tube that cooperates with the concave surface of the lens among the two fixed tubes of the present invention serves as a positioning tube and remains relatively fixed with the edging machine, and the position of the stepped surface of the processed lens is positioned through the positioning tube.

[0013] Beneficial effects: A high-precision aperture processing control method and processing device for a concave lens disclosed by the present invention have the following beneficial effects: 1. The present invention measures the data of the incoming lens, determines the corresponding sagitta deviation based on the deviation between the concave curvature of the incoming lens and the standard curvature, calculates the corresponding sagitta through the target aperture size of the lens, and determines the grinding amount of the stepped surface of the lens based on the sagitta and the central thickness of the lens. By controlling the sagitta, the processing of different lens apertures is achieved. The simple and reliable thickness high-precision measurement device and method can accurately and quickly complete the high-precision processing and measurement of the finished lens aperture.

[0014] 2. For the control method of the lens aperture of the present invention, on the one hand, high-precision aperture processing can be achieved for a single concave lens. At the same time, since the concave processing curvature of the same type of lens by the lens processing machine is basically the same or the floating range is very small, therefore, based on the detection results of the concave lens and the edging requirements, it can provide guidance for the adjustment of the machine processing parameters in reverse, directly achieving high-precision control of the lens aperture from the original processing stage, thereby avoiding the use of high-precision measurement equipment for secondary measurement of the aperture, reducing costs, and improving production efficiency.

[0015] 3. The present invention positions the concave surface of the lens through a fixed tube with a fixed pipe diameter. According to parameters such as the concave curvature of the lens and the pipe diameter of the fixed tube, the position of the stepped surface of the lens on the machine tool can be accurately obtained, which is convenient for subsequent control of the machine tool for grinding the stepped surface of the lens, is not affected by the measurement accuracy, and improves the positioning efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0017] Figure 1 It is a structural diagram of the concave lens of the present invention; Figure 2 It is a schematic diagram of the fixed state of the concave lens of the present invention on the edging machine; Figure 3 It is a schematic diagram of the grinding wheel structure of the edging machine of the present invention; Among them, 1 - grinding wheel, 2 - fixed tube, 3 - lens, 4 - main shaft, 5 - nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth below. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. On the contrary, the following description provides a convenient illustration for implementing exemplary embodiments of the present disclosure. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made within the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0019] As Figure 1 shown, the concave lens to be processed by the present invention, in the orientation shown in the figure, the left side of the lens is the concave surface, the planar area outside the concave surface is the lens step surface, and the lens aperture is the diameter of the edge of the concave surface; the right side of the lens is planar.

[0020] The present invention provides a high-precision aperture processing control method for a concave lens, which does not require the use of high-precision measuring equipment to measure the concave aperture of the lens, and at the same time can achieve precise control of the concave aperture.

[0021] The specific method includes the following steps: S01. Measure the concave curvature, central thickness, and total height of the incoming lens to obtain the data of the incoming lens; The concave curvature is represented by the corresponding radius of curvature. As Figure 1 shown, in the figure, R1 represents the radius of curvature corresponding to the concave curvature of the actually processed concave lens, and R2 represents the radius of curvature corresponding to the standard concave curvature of the lens when designing the lens. The post-curvature after actual processing will fluctuate around the standard curvature due to the setting of processing equipment or processing parameters, and the corresponding R1 will be less than or greater than R2.

[0022] S02. Obtain the curvature deviation based on the measured concave curvature and the standard curvature of the incoming lens processing, and confirm the sagittal height deviation caused by the curvature deviation. The sagittal height is the vertical distance between the center of the concave surface of the lens and the lens step surface; When confirming the sagittal height deviation, a fixed tube with a fixed diameter is used for concentric positioning of the concave surface and the planar surface of the incoming lens, and the sagittal height deviation caused by the curvature deviation of the incoming lens is calculated based on the diameter of the fixed tube. The diameter of the fixed tube is smaller than the target aperture size of the lens; the diameter of the fixed tube is denoted as , the radius of curvature corresponding to the measured concave curvature of the incoming lens is R1, the radius of curvature corresponding to the standard curvature is R2, and the sagittal height deviation ; represents the sagittal height corresponding to the radius of curvature R2, represents the sagittal height corresponding to the radius of curvature R1.

[0023] The calculation of the corresponding sagittal height is carried out by substituting according to the relationship between the sagittal height and the radius of curvature: , where R represents the radius of curvature, represents the corresponding aperture size. In the embodiments of the present invention, when calculating the sagitta deviation, the corresponding value is the diameter of the fixed tube .

[0024] S03. Then, according to the target aperture size of the incoming lens blank and the measured concave curvature, calculate the sagitta corresponding to the target aperture size, where the target aperture size is the designed aperture for lens processing; The target aperture size of the lens blank is denoted as , the value is , and at this time, the sagitta corresponding to the corresponding target aperture size is .

[0025] S04. Determine the final total height of the lens according to the sagitta corresponding to the target aperture size, the sagitta deviation caused by the curvature deviation, and the target center thickness of the incoming lens blank, and perform grinding processing on the incoming lens blank according to the obtained total height of the lens and the measured total height and center thickness of the incoming lens blank; the target center thickness is the designed center thickness for lens processing.

[0026] By adding the sagitta corresponding to the target aperture size , the sagitta deviation and the target center thickness d, the total height H of the lens is obtained, and according to the measured center thickness d1 and total height H1 of the incoming lens blank, the grinding amount of the lens step surface is determined.

[0027] After measuring the total height H1 and the center thickness d1, the distance from the center of the concave surface of the corresponding lens to the current lens step surface is H1 - d1; the grinding amount on the side where the lens step surface is located is H1 - d1 - ; and for the flat surface on the right side of the lens, it can be controlled according to the total height.

[0028] The fixed tube of the present invention is preferably a thin-walled tube to avoid affecting the positioning accuracy of the lens step surface, and the material is a copper tube. The outer diameter of the fixed tube is used as the calculation reference for the sagitta deviation, and the fixed tube is used as the positioning reference during the grinding processing of the lens. The position of the lens on the machine tool is positioned through the fixed tube.

[0029] The process of positioning the lens by the fixed tube in the present invention includes: according to the measured center thickness and total height of the incoming lens blank, confirm the distance between the lens step surface and the center of the concave surface of the lens, and confirm the distance between the end of the fixed tube and the lens step surface through the measured concave curvature of the incoming lens blank and the diameter of the fixed tube. Finally, position the position of the lens step surface of the incoming lens blank on the machine tool through the position of the fixed tube on the processing machine tool where it is located. After obtaining the accurate position of the lens step surface on the machine tool, the machine tool can be used for grinding processing according to the calculated grinding amount.

[0030] As Figure 2 and Figure 3 shown, the present invention also discloses a high-precision aperture processing device for a concave lens. Using the above-mentioned processing control method, it includes an edge grinding machine and a grinding wheel 1. A lens clamping mechanism parallel to the main shaft 4 where the grinding wheel 1 is located is arranged on the edge grinding machine. There is a through hole in the center of the grinding wheel 1, and the end face is of a groove type. A layer of diamond is loaded on its groove and the adjacent side wall surfaces. It is connected to the main shaft 4 through the through hole. The main shaft 4 is a threaded shaft, and the grinding wheel 1 is locked and fixed on the main shaft 4 through a nut 5. When processing the lens 3, the lens 3 is clamped and fixed through the clamping mechanism, and the grinding wheel 1 is driven by the edge grinding machine to rotate for grinding the lens.

[0031] The lens clamping mechanism of the present invention includes two fixed tubes 2 arranged opposite to each other. The lens is clamped and fixed by contacting the concave surface and the flat surface of the lens 3 through the fixed tubes 2. The fixed tube among the two fixed tubes 2 that cooperates with the concave surface of the lens serves as a positioning tube and remains relatively fixed with the edge grinding machine. The position of the lens step surface to be processed is positioned through the positioning tube. The fixed tube 2 is a cylindrical copper tube, and the end close to the lens is a hollow columnar structure. When positioning the lens, the hollow end is used for positioning the lens.

[0032] A specific embodiment is provided below to illustrate the aperture processing control method of the present invention.

[0033] Assume the parameters of the lens finished product drawing, the material is K9, R1 = 32.42, R2 = 27.93, the central thickness is d = 6.86, the lens diameter Φ = 50, and the target aperture size = 44, where the diameter of the fixed tube is = 40, and the above data units are unified as mm.

[0034] First, calculate the sagittal height deviation through the diameter of the fixed tube and the curvature radii R1 and R2. In the embodiment of the present invention, R2 is less than R1, and correspondingly , .

[0035] The sagittal height = 8.6mm corresponding to the target aperture size of the lens.

[0036] The total height H required for lens processing = 6.86 + 1.53 + 8.6 = 16.99mm.

[0037] Based on the measured total height H1 and the central thickness d1, the grinding amount on the side where the lens step surface is located is H1 - d1 - 8.6; if the total height of the lens needs to be controlled, then the grinding amount on the side where the lens plane is located is d1 - d - 1.53. And since the allowable error for the total height of the lens is relatively large during lens processing, when the lens has been processed on the machine tool according to the preset parameters, the deviation of the total height can be ignored. In cases where high precision requirements for the lens size are needed, the grinding amount provided by the present invention can be used for grinding the lens plane side.

[0038] After confirming the grinding amount, install the lens on the edging machine, clamp and fix the lens through the lens clamping mechanism, and ensure that the center deviation of the lens meets the requirements. After the lens is fixed, position the coordinate position of the lens step surface on the edging machine according to the lens measurement parameters and the position of the end of the fixed tube, and then control the grinding wheel to grind the end face of the lens according to the set grinding amount until the sagittal height of the lens step surface reaches the predetermined requirement. At this time, the concave aperture of the lens is the target aperture size of the lens, and the processing of the lens is completed.

[0039] Through the processing method of the present invention, precise processing and control of the concave lens aperture can be achieved. At the same time, it can provide guidance for the processing parameters of the machine tool during batch processing, improve the processing efficiency and the processing precision of the lens.

Claims

1. A high-precision aperture processing control method for a concave lens, characterized in that: Includes steps: S01, measuring the concave curvature, center thickness and total height of the incoming lens to obtain the incoming lens data; S02. Determine the curvature deviation based on the measured concave surface curvature and the standard curvature of the incoming lens processing, and confirm the sagittal deviation caused by the curvature deviation. The sagittal is the vertical distance between the center of the concave surface of the lens and the step surface of the lens; S03, then calculating the sagittal height corresponding to the target aperture size according to the target aperture size of the incoming lens and the measured concave curvature, wherein the target aperture size is the designed aperture for lens processing; S04. Determine the final total height of the lens according to the sagittal height corresponding to the target aperture size, the sagittal height deviation caused by the curvature deviation, and the target center thickness of the incoming lens, and grind the incoming lens according to the obtained total height of the lens and the measured total height and center thickness of the incoming lens; the target center thickness is the designed center thickness of the lens processing.

2. The high-precision aperture processing control method of a concave lens according to claim 1, characterized in that: In step S02, a fixed tube with a fixed diameter is used to concentrically locate the concave surface and the flat surface of the incoming lens, and the sagittal deviation caused by the curvature deviation of the incoming lens is calculated based on the diameter of the fixed tube. The diameter of the fixed tube is smaller than the target aperture size of the lens; the diameter of the fixed tube is recorded as The curvature radius corresponding to the concave curvature measured by the incoming lens is R1, the curvature radius corresponding to the standard curvature is R2, and the sag deviation ; represents the vector height corresponding to the radius of curvature R2, Indicates the vector height corresponding to the curvature radius R1.

3. The high-precision aperture processing control method of a concave lens according to claim 2, characterized in that: In step S04, the arrow height corresponding to the target aperture size is , SAG deviation The total height of the lens is obtained by superimposing it with the target center thickness d, and the amount of grinding on the step surface of the lens is determined based on the measured center thickness and total height of the incoming lens.

4. The high-precision aperture processing control method of a concave lens according to claim 2, characterized in that: The fixed tube is a thin-walled tube. The outer diameter of the fixed tube is used as the calculation basis for the sagittal deviation. The fixed tube is used as the positioning basis for lens grinding. The position of the lens on the machine tool is positioned through the fixed tube.

5. The high-precision aperture processing control method of a concave lens according to claim 4, characterized in that: The process of positioning the lens through a fixed tube includes confirming the distance between the lens step surface and the center of the lens concave surface based on the measured center thickness and total height of the incoming lens, and confirming the distance between the end of the fixed tube and the lens step surface by measuring the concave surface curvature of the incoming lens and the diameter of the fixed tube. Finally, the position of the lens step surface of the incoming lens on the processing machine tool is positioned by the position of the fixed tube on the processing machine tool.

6. A high-precision aperture processing device for a concave lens, using the processing control method according to any one of claims 1 to 5, characterized in that: The invention comprises an edge grinder and a grinding wheel (1). A lens clamping mechanism is arranged on the edge grinder and is parallel to a main shaft (4) on which the grinding wheel (1) is located. When processing a lens (3), the lens (3) is clamped and fixed by the clamping mechanism, and the edge grinder drives the grinding wheel (1) to rotate to grind the lens.

7. A high-precision aperture processing device for a concave lens according to claim 6, characterized in that: The lens clamping mechanism comprises two fixing tubes (2) arranged opposite to each other, and the lens is clamped and fixed by contact between the fixing tubes (2) and the concave surface and the flat surface of the lens (3).

8. The high-precision aperture processing device for a concave lens according to claim 7, characterized in that: The fixing tube (2) that matches the concave surface of the lens serves as a positioning tube and is relatively fixed to the edge grinding machine, and the position of the processed step surface of the lens is positioned by the positioning tube.

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