CN113878438B - Processing method of lens finished product - Google Patents
Processing method of lens finished product Download PDFInfo
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- CN113878438B CN113878438B CN202111108523.4A CN202111108523A CN113878438B CN 113878438 B CN113878438 B CN 113878438B CN 202111108523 A CN202111108523 A CN 202111108523A CN 113878438 B CN113878438 B CN 113878438B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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Abstract
The invention discloses a processing method of a lens finished product, which accurately controls the edge thickness difference of a lens in a fine grinding process, meets the requirement of the high-precision edge thickness difference of the lens finished product, omits an edge grinding process and greatly reduces the cost; meanwhile, in the fine grinding processing procedure, a plurality of lens blanks can be processed at one time, the processing output is doubled, and the processing efficiency is greatly improved; finally, the radius and thickness change of the lens in the process of accurately grinding the plurality of lenses is lower than the change frequency of the lens during single-chip processing, and the repair is simpler.
Description
Technical Field
The invention relates to a processing method of a lens finished product.
Background
The existing processing method for cold-processing a lens finished product is to sequentially process the lens finished product by adopting the working procedures of milling, grinding, polishing and edging to obtain the lens finished product, on one hand, the processing method has multiple steps, high cost and low efficiency, on the other hand, the edge thickness difference of the lens finished product is obtained by edging control of a last-step edging machine, the edge thickness difference obtained by edging the existing conventional edging machine has limited precision, and the lowest edge thickness difference precision can reach 0.005.
Disclosure of Invention
The invention aims to: the invention aims to provide a lens finished product processing method for obtaining high-precision edge thickness difference without edging, and the processing method can obtain the high-precision edge thickness difference through a fine grinding processing procedure, thereby omitting the edging procedure and reducing the processing cost.
The technical scheme is as follows: the processing method of the lens finished product sequentially comprises the working procedures of milling, grinding and polishing; wherein, the fine grinding procedure comprises a processing clamp and a fine grinding die; the processing clamp is a clamp body with a cambered surface, and three grooves with the circle centers positioned on the same circumferential surface are arranged on the cambered surface of the clamp body; the fine grinding die comprises an arc-shaped groove with an open top; during processing, fixing the lens to be processed in the groove of the clamp body, and then placing the clamp body in the arc-shaped groove of the fine grinding die; according to the requirements of the finished product of the lens fine grinding, wherein the curvature radiuses of the corresponding surfaces of the lens are R1 and R2 respectively, the center thickness of the lens is D, the diameter of the lens is D, and the edge thickness difference is not more than F; assuming that the corresponding lens thickness is unchanged when the edge thickness difference is 0 and the curvature radius R value of the processed surface of the lens is changed, obtaining different edge thickness difference values of the lens, assuming that the corresponding curvature radius R value of the processed surface of the lens is unchanged when the edge thickness difference is 0 and the lens thickness is changed, obtaining different edge thickness difference values of the lens, and thus obtaining the relation between the edge thickness difference of the lens and the center thickness as well as the curvature radius of the processed surface; assuming that the value of the curvature radius R of the lens processing surface is unchanged when the edge thickness difference is 0 and the value of the curvature radius R of the lens processing surface is unchanged when the edge thickness difference is 0, and the diameter of the lens is changed on the basis of the value D to obtain different edge thickness difference values of the lens; thereby obtaining the relation between the diameter of the lens and the edge thickness difference; and based on the relationship, respectively obtaining corresponding edge thickness difference values of the curvature radius R value of the lens processing surface, the lens center thickness D and the lens diameter D in an allowable tolerance range, and obtaining a finished lens product with the edge thickness difference not greater than F by processing the curvature radius R value of the lens processing surface, the lens center thickness D and the lens diameter D to a certain value in the tolerance range.
Wherein, when processing the different faces of lens, the processing anchor clamps that correspond are different, and when processing the first face of lens, the concave surface is the plane in the recess of the processing anchor clamps I that correspond, and when processing the lens second face, the concave surface is the cambered surface in the recess of the processing anchor clamps II that correspond.
Wherein, all be equipped with plastics annular ring in the three recess, the annular ring passes through glue to be fixed on the inside wall of recess. The annular ring has a blocking effect on the edge of the lens, so that the lens is limited to move in the front, back, left and right directions, the annular ring is good in wear resistance, and the lens can be limited in the groove, namely the annular ring is used for fixing the lens placed in the groove of the clamp body.
The depth of the three grooves is consistent, and the depth of the grooves is based on the arc-shaped curved surface of the processing clamp.
And the curvature of the arc-shaped working surface of the fine grinding die is consistent with that of the corresponding surface of the fine grinding finished product.
The processing method of the lens finished product comprises the following steps of:
(1) Reversely deducing the requirements of the fine-ground finished product on the center thickness, the curvature radius and the edge thickness difference of the lens based on the requirements of the finished product on the center thickness, the curvature radius and the edge thickness difference of the lens; designing size parameters of a corresponding processing clamp based on the requirements of the center thickness, the curvature radius and the edge thickness difference of the corresponding surface of the lens of the finished product subjected to accurate grinding, wherein the size parameters comprise the curvature of the cambered surface of the processing clamp, the size of the groove and the arrangement relation of the groove;
(2) And (3) processing the curvature of the arc surface of the clamp: during processing, a cushion skin is placed in the groove; the curvature radius R3+ the thickness of the cushion skin of the arc surface of the clamp body = the curvature radius R1 or R2 of the corresponding surface of the finished lens finish grinding product (the curvature value of the surface to be processed of the lens is determined, and the curvature of the surface to be processed of the lens and the curvature of the clamp body are based on a circle center, namely the arc surface of the clamp body and the arc surface after the surface to be processed is processed are concentric circles); the size of the groove: the inner diameter of the groove is the sum of the diameter of the lens and the thickness of the annular ring; the arrangement relation of the grooves is as follows: the three grooves are uniformly distributed on the arc surface of the clamp body, and the included angles between the center lines of the three grooves and the center line of the clamp body are equal; the adjacent parts of the three uniformly distributed grooves on the clamp body must have certain spaced minimum distances so that the edges of three lenses placed in the grooves of the clamp body cannot touch, at the moment, the adjacent edges of three annular rings placed in the grooves of the clamp body cannot touch, and meanwhile, the wall thickness formed by the distance between the adjacent parts of the three grooves on the clamp body also needs to ensure the strength of the wall;
(3) Processing a first surface of a lens, respectively placing three lenses in three grooves of a processing clamp I, pressing the processing clamp I with a lens blank on a fine grinding die by a pressure head of a lower pendulum machine, adjusting the curvature of an arc-shaped working surface of the fine grinding die based on the curvature requirement of a corresponding surface of a fine grinding finished product, and passively rotating the processing clamp I under the driving of the fine grinding die rotating at a high speed;
(4) After one surface of the lens is machined, a fine grinding semi-finished product is obtained, the other surface of the lens is machined, three fine grinding semi-finished products are respectively placed in three grooves of a machining clamp II, the machining clamp II provided with the fine grinding semi-finished product is pressed on a fine grinding mold by a pressing head of a lower pendulum machine, the curvature of an arc-shaped working surface of the fine grinding mold is adjusted based on the curvature requirement of the corresponding surface of the fine grinding finished product, and the machining clamp II is driven by the fine grinding mold rotating at a high speed to rotate passively; and obtaining a fine grinding finished product.
Wherein, in the step (3) and the step (4), the pressure pressed on the processing clamp is 0.5-10 kg, and the rotating speed of the fine grinding die is 800-3500 rpm.
Wherein, in the step (3) and the step (4), the diameter ratio of the diameter of the fine grinding die to the diameter of the processing clamp is 1.5:1.
in the step (3) and the step (4), the curvature of the arc-shaped working surface in the accurate grinding die is determined based on the curvature of the corresponding surface of the accurate grinding finished product, the accurate grinding die with the corresponding curvature is adopted to process the workpiece for 3-5 s, the processing is stopped, the lens is taken out, the curvature of the processing surface of the lens is measured, if the requirement is met, the next step is carried out, if the requirement is not met, the curvature of the arc-shaped working surface of the accurate grinding die is trimmed by adopting the arc-shaped working surface of the trimming die, the curvature of the arc-shaped working surface of the trimming die is the same as the curvature of the corresponding surface of the accurate grinding finished product, and the caliber of the arc-shaped working surface of the trimming die is larger than the caliber of the arc-shaped working surface of the accurate grinding die
During processing, the thickness of the lens is adjusted based on the finish grinding time control, and the curvature radius of the corresponding surface of the lens is controlled based on the curvature radius of the finish grinding die. The handle of the accurate grinding die is fixed to a machine main shaft through a jig, the lens blank is placed on the machining clamp, then the machining clamp is placed on the arc-shaped working face of the accurate grinding die, machine parameters are adjusted, machining is started, the machine can automatically conduct liquid spraying to the arc-shaped working face of the accurate grinding die, and cutting effect is generated through relative motion of the accurate grinding die rotating at a high speed and the lens blank machining face rotating passively, so that the machining requirement of the lens corresponding to the cambered face is obtained.
Has the advantages that: compared with the prior art, the invention has the remarkable advantages that: according to the method, the edge thickness difference of the lens is accurately controlled in the fine grinding process, so that the requirement of the high-precision edge thickness difference of a finished lens product is met, the edge grinding process is omitted, and the cost is greatly reduced; meanwhile, in the fine grinding processing procedure, a plurality of lens blanks can be processed at one time, the processing output quantity is increased in multiples, and the processing efficiency is greatly improved; finally, the radius and thickness of the lens are changed less frequently than those of the lens machined by a single lens in the process of finely grinding the plurality of lenses, and the repair is simpler.
Drawings
FIG. 1 is a schematic structural view of a machining fixture I;
FIG. 2 is a top view of the machining fixture;
FIG. 3 is a schematic view of a structure of a fine-ground semi-finished product obtained by using the machining jig I;
FIG. 4 is a schematic structural view of a machining fixture II;
FIG. 5 is a schematic structural diagram of a fine grinding finished product obtained by using a processing clamp II;
FIG. 6 is a schematic view of a lens blank-equipped processing jig I placed in a finish grinding mold;
FIG. 7 is a schematic view of a machined one of the faces;
fig. 8 is a schematic structural view of the machining jig II with the refined semi-finished product placed in the refining mold;
FIG. 9 is a schematic diagram of a structure of a finished product of fine grinding obtained after both sides are processed;
fig. 10 is a schematic structural view of a finished refined product;
FIG. 11 is a schematic view showing a structure of a refining semifinished product;
fig. 12 is a schematic structural view of a lens blank.
Detailed Description
As shown in fig. 1 to 9, the method for processing a lens finished product according to the present invention sequentially includes the steps of milling, fine grinding and polishing; wherein, the fine grinding procedure comprises a processing clamp and a fine grinding die 9; the machining clamp is a clamp body 11 with an arc surface, three grooves 10 with the circle centers positioned on the same circumferential surface are arranged on the arc surface of the clamp body 11, included angles between center lines of the three grooves and the center line of the clamp body are equal, the fine grinding mold 9 comprises an arc-shaped groove 4 with an opening at the top, and the fine grinding mold 9 further comprises a handle 5 fixedly connected with an external rotating shaft; during processing, the lens 100 to be processed is fixed in the groove 10 of the clamp body 11, and then the clamp body 11 is placed in the arc-shaped groove 4 of the fine grinding mold 9; according to the requirements of the finished product of the lens fine grinding, wherein the curvature radiuses of the corresponding surfaces of the lens are R1 and R2 respectively, the center thickness of the lens is D, the diameter of the lens is D, and the edge thickness difference is not more than F; assuming that the corresponding lens thickness is unchanged when the edge thickness difference is 0, and the curvature radius R value of the lens processing surface is changed based on the corresponding curvature radius when the corresponding edge thickness difference is 0, obtaining different edge thickness difference values of the lens, assuming that the corresponding curvature radius R value of the lens processing surface is unchanged when the edge thickness difference is 0, and the lens thickness is changed based on the corresponding lens thickness when the corresponding edge thickness difference is 0, obtaining different edge thickness difference values of the lens, thereby obtaining the relation between the edge thickness difference of the lens and the center thickness as well as the curvature radius of the processing surface; assuming that the corresponding lens thickness when the edge thickness difference is 0 and the corresponding curvature radius R value of the lens processing surface when the edge thickness difference is 0 are not changed, the lens diameter is changed on the basis of the D value, and different edge thickness difference values of the lens are obtained; thereby obtaining the relation between the diameter of the lens and the thickness difference of the edge; and based on the relationship, respectively obtaining corresponding edge thickness difference values of the curvature radius R value of the lens processing surface, the lens center thickness D and the lens diameter D in an allowable tolerance range, and obtaining a finished lens product with the edge thickness difference not greater than F by processing the curvature radius R value of the lens processing surface, the lens center thickness D and the lens diameter D to a certain value in the tolerance range.
The influence of the tolerance of the lens diameter on the edge thickness difference of the lens is an independent factor, and cannot be changed by the change of the central thickness and the curvature of the lens, but the edge thickness difference in a certain direction can be generated, and the edge thickness difference and the lens have different thicknesses, and different edge thickness differences generated by the aperture can generate mutual offset effect, so that the edge thickness difference value of the lens is obtained.
When processing the different planes of lens, the processing anchor clamps that correspond are different, and when processing the first face of lens, concave surface 7 is the plane in the recess of the processing anchor clamps I1 that corresponds, and when processing the second face of lens, concave surface 6 is the cambered surface in the recess of the processing anchor clamps II8 that corresponds. The concave surface 7 is a plane groove 10 for placing the lens 100, the concave surface 6 of the processing clamp II corresponding to the groove is a cambered surface, and the concave surface 6 is a cambered surface groove 10 for placing the refined semi-finished product 90 of which one surface is refined.
The processing clamp is made of metal or plastic and is provided with a spherical segment cambered surface, the top of the processing clamp is provided with a plurality of grooves, the centers of circles of the grooves are uniformly distributed on the arc-shaped surface, the curvature surfaces of the grooves are consistent with the curvature surfaces of the segments, and the distribution uniformity of the three grooves is guaranteed.
Wherein, be equipped with plastics annular ring 2 in the recess 10, annular ring 2 passes through glue to be fixed on the inside wall of recess 10. The annular ring 2 has a blocking effect on the edge of the lens in the groove, so that the lens is limited to move in the front, back, left and right directions, the annular ring 2 is good in wear resistance, and the lens can be limited in the groove 10, namely the annular ring 2 is used for fixing the lens placed in the groove 10 of the clamp body 11. The depths of the three grooves 10 are consistent, and the depths of the grooves 10 are based on the arc-shaped curved surface of the processing fixture. During processing, place pad skin 3 in the recess 10, the camber face of lens relies on and realizes gluing each other with 3 faces of pad skin in the anchor clamps body recess 10 have elasticity, realizes the injecing to lens upper and lower direction to through the injecing of annular ring 2 to lens all around, left and right sides direction, and then fix lens and can not remove in the recess. The outer diameter of the cushion skin 3 is slightly smaller than the inner diameter of the groove 10, and the cushion skin 3 is directly placed in the groove 10.
The refining process also comprises at least one refining die 9, and the curvature of the arc-shaped working surface 4 of the refining die 9 is consistent with that of the corresponding surface of the refined finished product. The arc-shaped working surface 4 of the fine grinding die 9 is made of metal materials, and a diamond layer is paved on the arc-shaped working surface 4.
During processing, the thickness of the lens is adjusted based on the finish grinding time control, and the curvature radius of the corresponding surface of the lens is controlled based on the curvature radius of the finish grinding die. Fix the handle 5 of correct grinding mould 9 to the machine main shaft through the tool, place the lens blank on processing anchor clamps, then will process on anchor clamps place the arc working face 4 of correct grinding mould 9, adjust the machine parameter, start machine processing, machine start can automatic pipe jet liquid to correct grinding mould 9 arc working face 4 on, through the relative motion of the correct grinding mould 9 of high-speed rotation and the lens working face of passive rotation, produce the cutting action, obtain the processing requirement of the corresponding cambered surface of lens blank.
The invention relates to a processing method of a lens finished product, wherein the accurate grinding process specifically comprises the following steps:
(1.1) determining the requirement of the finished product of the fine grinding procedure of the lens according to the finished product polishing diagram of the lens and the machining allowance requirement of the polishing procedure: r1=21.0219, R2=21.0219, lens diameter
The center thickness d =2.015mm, the edge thickness difference is not more than 0.0038mm, see figure 10 for the concrete shape;
(1.2) assuming that the thickness of the lens is 2mm of the corresponding thickness when the edge thickness difference is 0, the curvature radius R2 of the processed surface of the lens is changed in an incremental manner on the basis of the R value 21 when the corresponding edge thickness difference is 0 to obtain different edge thickness difference values, see table 4, assuming that the curvature radius R of the processed surface of the lens is 21, the curvature radius when the corresponding edge thickness difference is 0, the thickness of the lens is changed in an incremental manner on the basis of 2mm of the d value to obtain different edge thickness difference values, see table 3; assuming that the center thickness is 2.15mm and the curvature radius R value 21 of the lens processing surface is unchanged, the diameter of the lens is changed in an increasing or decreasing manner on the basis of 8mm to obtain different edge thickness difference values of the lens, see Table 5;
(1.3) according to the thickness requirement, looking up a table 3, wherein when the allowable tolerance range of the thickness 2.015 is 0.005, the corresponding thicknesses are 2.01, 2.015 and 2.02, and the edge thickness differences corresponding to the thicknesses of 2.01, 2.015 and 2.02 are +0.0016, +0.0024 and +0.0032;
(1.4) according to the requirement of a lens processing surface R2, looking up a table 4 (the table 4 shows that the thickness is unchanged, and the change condition of the edge thickness difference when the R2 is changed), wherein the R values corresponding to the tolerance 0.0044 of R2=21.0219 are 21.0262, 21.0219 and 21.0175, and the edge thickness differences corresponding to the R values 21.0262, 21.0219 and 21.0175 are-0.0054, -0.0045 and-0.0036;
(1.5) according to the diameter requirement of lens processing, looking up a table 5, wherein the diameters corresponding to the allowable tolerance of 8mm are 7.99mm, 8mm and 8.01mm, and the edge thickness differences corresponding to the diameters of 7.99mm, 8mm and 8.01mm are +0.0019mm, 0mm and +0.0019mm;
(1.6) the relation among the center thickness, the R1 value and the diameter corresponding to the edge thickness difference is an addition and subtraction relation, the maximum edge thickness difference is obtained through arbitrary addition and subtraction among the center thickness, the R1 value and the diameter, the maximum edge thickness difference is a key index for processing the lens, and the maximum edge thickness difference is = +0.0016+0.00-0.0054= -0.0038, and whether the constraint quality is generated by the maximum edge thickness difference; directly using a plus sign to indicate the direction of the edge thickness difference in the list;
(1.7) setting parameters of a processing machine: the rotating speed is 1800 rpm, the pressure loaded on the processing clamp is 1 kg, and the processing time is 20 seconds;
(2.1) determining the requirements of the fine-grinding semi-finished product of the lens fine-grinding process according to the requirements of the fine-grinding finished product diagram of the lens: r1=21.0219, R2=21.0219, lens diameter
The center thickness =2.165mm, the edge thickness difference is not more than 0.0038mm, and the specific shape is shown in figure 11;
(2.2) assuming that the corresponding thickness is 2.15mm when the lens thickness is 0 and the radius of curvature R1 of the lens processing surface is gradually changed on the basis of the R value 21 when the corresponding edge thickness difference is 0 to obtain different edge thickness difference values, see table 2, assuming that the radius of curvature R of the lens processing surface is 21 and the radius of curvature when the corresponding edge thickness difference is 0, the lens thickness is gradually changed on the basis of 2.15mm of the d value to obtain different edge thickness difference values, see table 1; assuming that the central thickness is 2.15mm and the curvature radius R value of the lens processing surface is 21 unchanged, the diameter of the lens is changed in an increasing or decreasing manner on the basis of 8mm, and different edge thickness difference values of the lens are obtained, see Table 5;
(2.3) according to the thickness requirement, looking up a table 1, wherein when the allowable tolerance range of the thickness 2.165 is 0.005, the corresponding thicknesses are 2.16, 2.165 and 2.17, and the edge thickness differences corresponding to the thicknesses of 2.16, 2.165 and 2.17 are +0.0016, +0.0024 and +0.0032;
(2.4) according to the requirement of the lens processing surface R1, looking up a table 2 (the table 2 shows that the thickness is unchanged, and the change condition of the edge thickness difference when the R1 is changed), wherein the R values corresponding to the tolerance 0.0044 of R1=21.0219 are 21.0262, 21.0219 and 21.0175, and the edge thickness differences corresponding to the R values of 21.0262, 21.0219 and 21.0175 are-0.0054, -0.0045 and-0.0036;
(2.5) looking up a table 5 according to the diameter requirement of lens processing, wherein the diameters of 8mm correspond to the diameters of 7.99mm, 8mm and 8.01mm when the allowable tolerance is 0.01, and the edge thickness differences of +0.0019mm, 0mm and +0.0019mm when the diameters of 7.99mm, 8mm and 8.01 mm;
(2.6) the relation among the center thickness, the R1 value and the diameter corresponding to the edge thickness difference is an addition and subtraction relation, and the maximum edge thickness difference is obtained through arbitrary addition and subtraction among the center thickness, the R1 value and the diameter, and is a key index for processing the lens, namely the maximum edge thickness difference = +0.0016+0.00-0.0054= -0.0038; directly using +, -number to indicate the direction of the edge thickness difference in the list;
(2.7) setting parameters of a processing machine: the rotating speed is 1800 rpm, the pressure loaded on the machining fixture II8 is 1 kg, and the machining time is 20 seconds; the edge thickness difference key parameters of the finished lens are determined by calculation when the second surface is machined, namely the parameters of the finished lens are that R =21 tolerance is 0.0044, and the center thickness is: 2.015mm, the tolerance is 0.005, and the maximum edge thickness difference is 0.0038mm;
and 5, reversely designing a processing clamp I1 according to the specific parameters of the finished lens processing (one surface of the finished lens is processed) in the step 2, wherein the processing clamp I1 provided with the lens blank 100 is shown in figure 1, and in the processing clamp I1, the included angle between the central line of the groove 10 and the central line of the clamp body 11 is 17 degrees.
The fine grinding finished product obtained by the method can not only realize that the size of the lens meets the processing precision requirement, but also enable the edge thickness difference to reach a high precision target.
Wherein, table 1 shows the change of the edge thickness difference when the thickness is changed and the R1 is unchanged:
table 2 shows the variation of the edge thickness difference when R1 is changed without changing the thickness:
table 3 shows the variation of the edge thickness difference when the thickness is changed without changing R2:
table 4 shows the variation of the edge thickness difference when the R value is changed without changing the thickness:
table 5 shows the relationship between the thickness, R value and the difference between the diameter and the edge thickness:
Claims (8)
1. a processing method of a lens finished product is characterized by comprising the following steps: sequentially comprises the working procedures of milling, grinding and polishing; wherein, the fine grinding procedure comprises a processing clamp and a fine grinding die; the processing clamp is a clamp body with a cambered surface, and three grooves with the circle centers positioned on the same circumferential surface are arranged on the cambered surface of the clamp body; the fine grinding die comprises an arc-shaped groove with an open top; during processing, fixing the lens to be processed in the groove of the clamp body, and then placing the clamp body in the arc-shaped groove of the fine grinding die; according to the requirements of the finished product of the lens fine grinding, wherein the curvature radiuses of the corresponding surfaces of the lens are R1 and R2 respectively, the center thickness of the lens is D, the diameter of the lens is D, and the edge thickness difference is not more than F; assuming that the corresponding lens thickness is unchanged when the edge thickness difference is 0 and the curvature radius R value of the processed surface of the lens is changed, obtaining different edge thickness difference values of the lens, assuming that the corresponding curvature radius R value of the processed surface of the lens is unchanged when the edge thickness difference is 0 and the lens thickness is changed, obtaining different edge thickness difference values of the lens, and thus obtaining the relation between the edge thickness difference of the lens and the center thickness as well as the curvature radius of the processed surface; assuming that the value of the curvature radius R of the lens processing surface is unchanged when the edge thickness difference is 0 and the value of the curvature radius R of the lens processing surface is unchanged when the edge thickness difference is 0, and the diameter of the lens is changed on the basis of the value D to obtain different edge thickness difference values of the lens; thereby obtaining the relation between the diameter of the lens and the thickness difference of the edge; based on the relationship, respectively corresponding edge thickness difference values of the curvature radius R value of the lens processing surface, the lens center thickness D and the lens diameter D in an allowable tolerance range are obtained, so that a finished lens product with the edge thickness difference not greater than F is obtained by processing the curvature radius R value of the lens processing surface, the lens center thickness D and the lens diameter D to a certain value in the tolerance range;
the fine grinding process of the processing method comprises the following steps:
(1) Reversely deducing the requirements of the fine-ground finished product on the center thickness, the curvature radius and the edge thickness difference of the lens based on the requirements of the finished product on the center thickness, the curvature radius and the edge thickness difference of the lens; designing size parameters of a corresponding processing clamp based on the requirements of the center thickness, the curvature radius and the edge thickness difference of the corresponding surface of the lens of the finished product of accurate grinding, wherein the size parameters comprise the curvature of the cambered surface of the processing clamp, the size of a groove and the arrangement relation of the groove;
(2) And (3) processing the curvature of the arc surface of the clamp: during processing, a cushion skin is placed in the groove; the curvature radius R3+ the thickness of the cushion skin of the cambered surface of the clamp body = the curvature radius R1/R2 of the corresponding surface of the finished lens fine grinding product; size of the groove: the inner diameter of the groove is the sum of the diameter of the lens and the thickness of the annular ring; the arrangement relation of the grooves is as follows: the three grooves are uniformly distributed on the cambered surface of the clamp body, and the included angles between the center lines of the three grooves and the center line of the clamp body are equal;
(3) Processing a first surface of a lens, respectively placing three lenses in three grooves of a processing clamp I, pressing the processing clamp I with a lens blank on a fine grinding die by a pressure head of a lower pendulum machine, adjusting the curvature of an arc-shaped working surface of the fine grinding die based on the curvature requirement of a corresponding surface of a fine grinding finished product, and passively rotating the processing clamp I under the driving of the fine grinding die rotating at a high speed;
(4) Processing one surface of the lens to obtain a fine grinding semi-finished product, processing the other surface of the lens, respectively placing three fine grinding semi-finished products in three grooves of a processing clamp II, pressing the processing clamp II with the fine grinding semi-finished product on a fine grinding mold by a pressure head of a lower pendulum machine, adjusting the curvature of an arc-shaped working surface of the fine grinding mold based on the curvature requirement of the corresponding surface of the fine grinding finished product, and passively rotating the processing clamp II under the driving of the fine grinding mold rotating at a high speed; obtaining a fine grinding finished product;
the specific operation mode is as follows:
step 1, firstly determining the parameters of the processing of the second surface of the lens:
(1.1) determining the requirement of the fine grinding finished product of the lens fine grinding procedure according to the finished product drawing of the lens polishing and the machining allowance requirement of the polishing procedure: r1=21.0219, R2=21.0219, lens diameter wide =8mm, center thickness d =2.015mm, edge thickness difference is not more than 0.0038mm;
(1.2) assuming that the thickness of the lens is 2mm of the corresponding thickness when the side thickness difference is 0, and the curvature radius R2 of the lens processing surface is changed in an increasing mode on the basis of the R value 21 when the corresponding side thickness difference is 0 to obtain different side thickness difference values, assuming that the curvature radius R of the lens processing surface is 21, and corresponding to the curvature radius when the corresponding side thickness difference is 0, the thickness of the lens is changed in an increasing mode on the basis of 2mm of the d value to obtain different side thickness difference values; assuming that the center thickness is 2.15mm and the curvature radius R value of the lens processing surface is 21 constant, and the diameter of the lens is changed in an increasing or decreasing manner on the basis of 8mm to obtain different edge thickness difference values of the lens;
(1.3) according to the thickness requirement, when the allowable tolerance range of the thickness 2.015 is 0.005, the thicknesses are 2.01, 2.015 and 2.02, and the edge thickness difference corresponding to the thicknesses of 2.01, 2.015 and 2.02 is +0.0016, +0.0024 and +0.0032;
(1.4) changing the change condition of the edge thickness difference when R2 is required according to the lens processing surface R2, wherein the R values corresponding to the tolerance 0.0044 of R2=21.0219 are 21.0262, 21.0219 and 21.0175, and the edge thickness differences corresponding to the R values of 21.0262, 21.0219 and 21.0175 are-0.0054, -0.0045 and-0.0036;
(1.5) according to the diameter requirement of lens processing, the diameters corresponding to the allowable tolerance of 0.01 mm of the diameter 8mm are 7.99mm, 8mm and 8.01mm, and the edge thickness differences corresponding to the diameters of 7.99mm, 8mm and 8.01mm are +0.0019mm, 0mm and +0.0019mm;
(1.6) the relation of the center thickness, the R1 value and the diameter corresponding to the edge thickness difference is an addition and subtraction relation, the maximum value of the edge thickness difference is obtained through arbitrary addition and subtraction of the center thickness, the R1 value and the diameter, and the maximum value of the edge thickness difference is a key index of processing the lens, namely the maximum value of the edge thickness difference is = +0.0016+0.00-0.0054= -0.0038;
(1.7) setting parameters of a processing machine: the rotating speed is 1800 rpm, the pressure loaded on the processing clamp is 1 kg, and the processing time is 20 seconds;
step 2, determining the processing parameters of the first surface of the lens:
(2.1) determining the requirements of the fine grinding semi-finished product in the lens fine grinding process according to the requirements of the fine grinding finished product of the lens: r1=21.0219, R2=21.0219, lens diameter branst =8mm, center thickness =2.165mm, edge thickness difference is not more than 0.0038mm;
(2.2) assuming that the corresponding thickness is 2.15mm when the lens thickness is 0 and the radius of curvature R1 of the lens processing surface is gradually changed on the basis of the R value 21 when the corresponding side thickness difference is 0 to obtain different side thickness difference values, assuming that the radius of curvature R of the lens processing surface is 21 and is not changed, corresponding to the radius of curvature when the corresponding side thickness difference is 0, the lens thickness is gradually changed on the basis of 2.15mm of the d value to obtain different side thickness difference values; assuming that the center thickness is 2.15mm and the curvature radius R value of the lens processing surface is 21 constant, and the diameter of the lens is changed in an increasing or decreasing manner on the basis of 8mm to obtain different edge thickness difference values of the lens;
(2.3) according to the thickness requirement, when the allowable tolerance range of the thickness 2.165 is 0.005, the thicknesses are 2.16, 2.165 and 2.17, and the edge thickness difference corresponding to the thicknesses of 2.16, 2.165 and 2.17 is +0.0016, +0.0024 and +0.0032;
(2.4) according to the requirement of the lens processing surface R1, changing the change condition of the edge thickness difference at the time of R1, wherein the R values corresponding to the tolerance 0.0044 of R1=21.0219 are 21.0262, 21.0219 and 21.0175, and the edge thickness differences corresponding to the R values of 21.0262, 21.0219 and 21.0175 are-0.0054, -0.0045 and-0.0036;
(2.5) according to the diameter requirement of lens processing, the diameters corresponding to the diameters of 8mm with an allowable tolerance of 0.01 are 7.99mm, 8mm and 8.01mm, and the edge thickness differences corresponding to the diameters of 7.99mm, 8mm and 8.01mm are +0.0019mm, 0mm and +0.0019mm;
(2.6) the relation among the center thickness, the R1 value and the diameter corresponding to the side thickness difference is an addition and subtraction relation, and the maximum side thickness difference is obtained through arbitrary addition and subtraction among the center thickness, the R1 value and the diameter, wherein the maximum side thickness difference is = +0.0016+0.00-0.0054= -0.0038;
(2.7) setting parameters of a processing machine: the rotating speed is 1800 rpm, the pressure loaded on the processing fixture II is 1 kg, and the processing time is 20 seconds; the edge thickness difference key parameter of the finished lens product is determined by calculating when the second surface is processed, namely the parameters of the finished product are processed, the R =21 tolerance is 0.0044, and the center thickness is: 2.015mm, the tolerance is 0.005, and the maximum edge thickness difference is 0.0038mm;
step 3, determining the parameters of the lens blank: diameter 8mm, tolerance 0.01, thickness 2.3mm, tolerance 0.005;
step 4, reversely designing a machining clamp II according to the specific parameters of the processed lens in the step 1, wherein the included angle between the central line of the groove and the central line of the clamp body is 17 degrees in the machining clamp II;
and 5, reversely designing a machining clamp I according to the specific parameters of the processed lens in the step 2, wherein the included angle between the central line of the groove and the central line of the clamp body in the machining clamp I is 17 degrees.
2. The method for processing a lens finished product according to claim 1, wherein: when processing the different planes of lens, the processing anchor clamps that correspond are different, and when processing the first face of lens, the concave surface is the plane in the recess of the processing anchor clamps I that correspond, and when processing the second face of lens, the concave surface is the cambered surface in the recess of the processing anchor clamps II that correspond.
3. The method for processing a lens product according to claim 1, wherein: all be equipped with plastics annular ring in the three recess, the annular ring passes through glue to be fixed on the inside wall of recess.
4. The method for processing a lens product according to claim 1, wherein: the depth of the three grooves is consistent, and the depth of the grooves is based on the arc-shaped curved surface of the processing clamp.
5. The method for processing a lens product according to claim 1, wherein: and the curvature of the arc-shaped working surface of the fine grinding die is consistent with that of the corresponding surface of the fine grinding finished product.
6. The method for processing a lens product according to claim 1, wherein: in the step (3) and the step (4), the pressure of pressing on the processing clamp is 0.5-10 kg, and the rotating speed of the fine grinding die is 800-3500 rpm.
7. The method for processing a lens finished product according to claim 1, wherein: in the step (3) and the step (4), the diameter ratio of the diameter of the fine grinding die to the diameter of the processing clamp is 1.5:1.
8. the method for processing a lens product according to claim 1, wherein: in the step (3) and the step (4), the curvature of the arc-shaped working surface in the fine grinding die is determined based on the curvature of the corresponding surface of the fine grinding finished product, the fine grinding die with the corresponding curvature is adopted to process for 3-5 s, then the processing is stopped, the lens is taken out, the curvature of the processing surface of the lens is measured, if the requirement is met, the next step is carried out, if the requirement is not met, the curvature of the arc-shaped working surface of the fine grinding die is trimmed by the arc-shaped working surface of the trimming die, the curvature of the arc-shaped working surface of the trimming die is the same as the curvature of the corresponding surface of the fine grinding finished product, and the caliber of the arc-shaped working surface of the trimming die is larger than the caliber of the arc-shaped working surface of the fine grinding die.
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