Manufacturing method of optical lens mold

Abstract

The invention relates to an optical lens mold manufacturing method which comprises the following steps: detecting size parameters of a to-be-processed surface of a mold core, and establishing a processing coordinate system of the to-be-processed surface based on the size parameters of the to-be-processed surface; based on the machining coordinate system, the center coordinates of all the core holes are determined through preset design parameters; according to the center coordinates of all the core holes, a plurality of core holes are formed in the to-be-machined face through machining by means of finish machining equipment; taking the centers of the core holes as a touch number reference, and determining coordinates of column pin positions corresponding to the core holes based on the touch number reference; and according to the coordinates of all the column foot positions, a plurality of column foot positions are formed on the to-be-machined face through machining by means of finish machining equipment. The center coordinates of the core holes are used as the touch number reference, so that the error of the distance between the core holes and the column feet can be effectively reduced, the concentricity between the column feet and the core holes is improved, the concentricity of the front mold and the rear mold is higher, the concentricity of the optical lens manufactured through the mold core is better, and the production efficiency of the optical lens is improved. And the precision and the optical performance of the optical lens are improved.

Description

Technical Field

[0001] The invention relates to the technical field of optical lens manufacturing, and in particular to a method for manufacturing an optical lens mold. Background Art

[0002] The optical lens refers to the lens in the backlight module of the liquid crystal display. The optical lens covers the LED (light-emitting diode) lamp beads and is used to diffuse the light emitted by the LED lamp beads to the liquid crystal, so that the liquid crystal emits light and displays.

[0003] The accuracy of the optical lens affects the backlight effect of the backlight module. One of the factors affecting the accuracy of the optical lens is the center deviation of the optical lens. The optical lens is produced by a mold, and the concentricity of the mold determines the center deviation of the optical lens.

[0004] The molds used in existing optical lens molds include a front mold and a rear mold. If the centers of the front mold and the rear mold (or the upper mold and the lower mold) cannot be aligned, the center of the produced optical lens will be offset and cannot meet the parameter requirements of the optical lens. Summary of the invention

[0005] Based on this, it is necessary to provide a method for making an optical lens mold.

[0006] A method for manufacturing an optical lens mold, comprising:

[0007] Provide molds;

[0008] Performing rough processing on the mold core to obtain a roughly processed mold core;

[0009] Installing the rough-processed mold core on a finishing device, and calibrating the flatness and verticality of the mold core on the finishing device;

[0010] Detecting the size parameters of the surface to be processed of the mold core, and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed;

[0011] Based on the machining coordinate system, the center coordinates of each core hole are determined using preset design parameters;

[0012] According to the center coordinates of each of the core holes, a plurality of core holes are formed on the surface to be processed by using the finishing equipment;

[0013] Taking the center of the core hole as a collision number reference, and determining the coordinates of the column foot position corresponding to each core hole based on the collision number reference;

[0014] According to the coordinates of each of the column foot positions, the finishing equipment is used to form a plurality of column foot positions on the surface to be processed.

[0015] In one embodiment, the step of detecting the size parameters of the surface to be processed of the mold core and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed comprises:

[0016] Acquiring an image of the surface to be processed of the mold core located on the finishing equipment by an image sensor to obtain an image of the surface to be processed;

[0017] Binarizing the image of the surface to be processed to obtain a binary image of the surface to be processed;

[0018] According to the structure of surface, line and point, the geometric features of the binary image are extracted to obtain the surface features, line features and point features of the surface to be processed;

[0019] Reconstructing a feature image of the surface to be processed by using the surface features, the line features and the point features to obtain a geometric feature map;

[0020] According to the geometric feature diagram, the size parameters of the surface to be processed of the mold core are detected, and based on the size parameters of the surface to be processed, a processing coordinate system of the surface to be processed is established.

[0021] In one embodiment, the step of detecting the size parameters of the surface to be processed of the mold core according to the geometric feature map, and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed comprises:

[0022] According to the geometric characteristic diagram, detecting the dimensional parameters of the surface to be processed of the mold core;

[0023] Detecting whether the size parameters meet the concentricity accuracy conditions;

[0024] When the size parameters do not meet the concentricity accuracy condition, the geometric center of the surface to be processed is determined according to the size parameters of the surface to be processed, and a processing coordinate system of the surface to be processed is established with the geometric center of the surface to be processed as the coordinate origin.

[0025] In one embodiment, after the step of detecting whether the size parameter satisfies the concentricity accuracy condition, the step further includes:

[0026] When the size parameters meet the concentricity accuracy condition, the intersection point of two adjacent edges of the surface to be processed is determined according to the size parameters of the surface to be processed, and a processing coordinate system of the surface to be processed is established with the intersection point as the coordinate origin.

[0027] In one embodiment, the step of detecting whether the size parameter satisfies the concentricity accuracy condition comprises:

[0028] According to the size parameters of the surface to be processed, a test coordinate system is established with the intersection point of two adjacent edges of the surface to be processed as the coordinate origin;

[0029] Based on the test coordinate system, using the preset design parameters, determine the first test coordinate of the center of each core hole and the second test coordinate of each column foot position;

[0030] Calculate the test center coordinates of the surface to be processed according to the first test coordinates of the center of each core hole and the second test coordinates of each column foot position;

[0031] Determining the geometric center coordinates of the surface to be processed according to the size parameters of the surface to be processed;

[0032] Detecting whether the deviation between the test center coordinates and the geometric center coordinates is less than a preset threshold;

[0033] Among them, if the deviation between the test center coordinates and the geometric center coordinates is less than a preset threshold, the size parameter meets the concentricity accuracy condition; if the deviation between the test center coordinates and the geometric center coordinates is greater than or equal to the preset threshold, the size parameter does not meet the concentricity accuracy condition.

[0034] In one embodiment, before the step of binarizing the image of the surface to be processed to obtain the binarized image of the surface to be processed, the step further includes:

[0035] Inputting the image of the surface to be processed into an image recognition model, using the image recognition model to identify a noise area in the image of the surface to be processed, and adding a noise mark to the noise area;

[0036] The step of performing binarization processing on the image of the surface to be processed to obtain the binarized image of the surface to be processed comprises:

[0037] According to the noise identification, the image of the surface to be processed is binarized, and the noise area corresponding to the noise identification is eliminated to obtain the binarized image of the surface to be processed.

[0038] In one embodiment, the step of installing the rough-processed mold core on a finishing device and calibrating the flatness and verticality of the mold core on the finishing device comprises:

[0039] The mold core after rough processing is installed on a finishing device, and a distance meter is used to measure and obtain the three-dimensional characteristic parameters of the mold core;

[0040] According to the three-dimensional characteristic parameters, detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality;

[0041] When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, according to the preset flatness and the preset verticality, the robot arm is controlled to adjust the position and angle of the mold core on the finishing equipment to calibrate the flatness and verticality of the mold core on the finishing equipment;

[0042] When the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality, a three-dimensional model of the mold core is constructed according to the three-dimensional feature parameters.

[0043] In one embodiment, the step of reconstructing the feature image of the surface to be processed by using the surface features, the line features and the point features to obtain a geometric feature map comprises:

[0044] Analyze the three-dimensional model of the mold core to obtain the two-dimensional characteristic parameters of the surface to be processed;

[0045] Comparing the two-dimensional feature parameters with the surface features, the line features, and the point features, and establishing a corresponding relationship between the two-dimensional feature parameters and the surface features, the line features, and the point features;

[0046] Based on the correspondence between the two-dimensional feature parameters and the surface features, the line features and the point features, the corresponding surface features, the line features and the point features are constrained by using the two-dimensional feature parameters;

[0047] The feature image of the surface to be processed is reconstructed using the surface features, the line features and the point features to obtain a geometric feature map.

[0048] In one embodiment, the step of measuring the three-dimensional characteristic parameters of the mold core using a rangefinder includes:

[0049] Acquire a reference three-dimensional model, wherein the reference three-dimensional model records the three-dimensional parameters of the standard mold core and the measurement reference of the mold core;

[0050] Using a distance meter to measure and obtain geometric parameters of at least one side edge of the mold core;

[0051] Using geometric parameters of at least one side edge of the mold core, constructing a three-dimensional detection coordinate;

[0052] Extracting a measurement reference from the reference three-dimensional model, and determining a measurement position and a measurement angle of a rangefinder based on the three-dimensional detection coordinates and the measurement reference;

[0053] Adjust the position and angle of the rangefinder based on the measurement position and the measurement angle, and obtain the three-dimensional characteristic parameters of the mold core by measuring with the rangefinder;

[0054] The step of detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality according to the three-dimensional feature parameters comprises:

[0055] Acquire the three-dimensional reference coordinates of the finishing equipment;

[0056] According to the three-dimensional reference coordinates of the equipment and the three-dimensional characteristic parameters, detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality;

[0057] When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, the step of controlling the robot arm to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality to calibrate the flatness and verticality of the mold core on the finishing equipment comprises:

[0058] When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, the robotic arm is controlled to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality so that the three-dimensional detection coordinates coincide with the three-dimensional reference coordinates of the equipment to calibrate the flatness and verticality of the mold core on the finishing equipment.

[0059] In one embodiment, the step of taking the center of the core hole as a collision number reference and determining the coordinates of the column foot positions corresponding to each core hole based on the collision number reference comprises:

[0060] Taking the center coordinates of each core hole as the coordinate origin, a plurality of reference sub-coordinate systems are established respectively;

[0061] The center of the core hole is used as the collision number reference, and based on each reference sub-coordinate system and using the preset design parameters, the coordinates of the column foot position corresponding to each core hole are determined.

[0062] The beneficial effect of the present invention is that by taking the central coordinates of each core hole as the reference for the number of collisions, the error in the distance between the core hole and the column foot can be effectively reduced, and the concentricity between the column foot and the core hole can be improved. In this way, the error caused by determining the position of the column foot by the diagonal angle of the mold core is reduced, so that the concentricity of the upper mold and the lower mold is higher, and then the concentricity of the optical lens manufactured by the mold core is better, thereby improving the accuracy and optical performance of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0064] Figure 1 A schematic diagram of a process for manufacturing an optical lens mold according to an embodiment of the present invention;

[0065] Figure 2 A schematic diagram of determining the coordinates of each core hole and column foot based on a coordinate system established with the diagonal corner of the mold core as the coordinate origin in the optical lens mold manufacturing process in the prior art;

[0066] Figure 3 The present invention is a schematic diagram of determining the coordinates of each core hole and column foot based on a coordinate system established with the center of each core hole as the coordinate origin during the optical lens mold manufacturing method of one embodiment. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] like Figure 1 As shown, it is a method for manufacturing an optical lens mold according to an embodiment of the present invention, comprising:

[0069] Step 110, providing a mold core.

[0070] In this embodiment, the mold core is the core of the mold, also called a male mold. The mold core referred to in this step is a mold core that has not yet been processed, and can also be called a mold core embryo.

[0071] Step 120, rough-processing the mold core to obtain a roughly processed mold core.

[0072] In this step, according to the preset three-dimensional design drawings, CNC (Computerized Numerical Control) is programmed, and the mold core is rough-processed using CNC to obtain a rough-processed mold core. The size of the rough-processed mold core is equal to or similar to that of the finished mold core, and the core hole and column foot position have not yet been milled on the rough-processed mold core.

[0073] In this step, the mold core is rough-processed using rough-processing equipment, and the rough-processing includes cutting and shaping to form the main body of the mold core.

[0074] Step 130, installing the mold core after rough processing on the finishing equipment, and calibrating the flatness and verticality of the mold core on the finishing equipment.

[0075] In this embodiment, the finishing equipment has higher processing accuracy than the rough processing equipment. In some embodiments, the finishing equipment is CNC. In this step, the flatness and verticality of the mold core on the finishing equipment are calibrated so that the surface to be processed of the mold core remains horizontal or vertical, so that the tool can mill the mold core better and more accurately, which can effectively improve the processing accuracy. In addition, after the flatness and verticality of the mold core are calibrated, it is beneficial to improve the detection accuracy of the mold core in the subsequent steps, and further improve the processing accuracy.

[0076] Step 140 , detecting the size parameters of the surface to be processed of the mold core, and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed.

[0077] In this embodiment, the surface to be processed is a surface on the mold core that needs to be processed and forms the core hole and the column foot. In this embodiment, the size parameters of the surface to be processed of the mold core include the position of the edge of the surface to be processed, the length of the edge of the surface to be processed, the position of the geometric center of the surface to be processed, and the angle between the edges of the surface to be processed. In this step, based on the size parameters of the surface to be processed, a processing coordinate system based on the surface to be processed is established, and the processing coordinate system is used to define the coordinates of each position on the surface to be processed.

[0078] Step 150 , based on the processing coordinate system and using preset design parameters, determine the center coordinates of each core hole.

[0079] In this embodiment, the preset design parameters are also called preset processing parameters. The preset design parameters are designed according to the specifications of the product to be processed. The preset design parameters record the relative position information of each core hole and the position information of the column foot corresponding to each core hole. The position information of the column foot is the position information relative to the core hole, not the absolute position information, nor the position information on the surface to be processed. The position information of the core hole on the coordinate system is the preset coordinate system. When the preset coordinate system and the processing coordinate system are the same coordinate system or the origin coordinates of the preset coordinate system coincide with the origin coordinates of the processing coordinate system, the center coordinates of the core hole are the coordinates on the processing coordinate system.

[0080] In this embodiment, according to the preset design parameters, the origin coordinates of the processing coordinate system are taken as the origin coordinates of the preset coordinate system, and the center coordinates of each core hole are selected on the processing coordinate system.

[0081] Step 160 , according to the center coordinates of each of the core holes, use the finishing equipment to form a plurality of core holes on the surface to be processed.

[0082] In this embodiment, after the center coordinates of the core hole are determined, the finishing equipment selects a tool according to a program, and uses the tool to perform processing on the surface to be processed, thereby forming a plurality of core holes on the surface to be processed.

[0083] Step 170, taking the center of the core hole as a collision number reference, and determining the coordinates of the column foot position corresponding to each core hole based on the collision number reference.

[0084] In this embodiment, the column foot position is also called the column foot, and the column foot is used to position the upper mold and the lower mold when the mold is closed. Each core hole corresponds to multiple column foot positions, that is, the outer side of each core hole surrounds multiple column foot positions, and the multiple column foot positions corresponding to the core hole are arranged around the core hole with the central coordinate of the core hole as the center of the circle.

[0085] It is worth mentioning that in traditional mold core processing, such as Figure 2 As shown, one of the diagonals of the to-be-processed surface of the rectangular or square mold core is used as the collision number reference, and a coordinate system is established with the position of the diagonal as the coordinate origin. The coordinates of the diagonal are (0.00, 0.00), and the coordinates of each core hole and each column foot are determined by this coordinate system. For example, the center coordinates of one of the core holes are (48.72, 42.72). Subsequently, processing is performed based on the coordinates of each core hole and each column foot. This method has disadvantages: on the one hand, since the core hole and the corresponding column foot are not positioned according to a direct relative position, but the absolute position is determined by the coordinate system, there is no direct correspondence between the positions of the core hole and the column foot, resulting in an error in the distance between the core hole and the corresponding column foot, and the error is often greater than 0.005mm. On the other hand, the distance between the origin of the coordinate system and the core hole and each column foot is large, resulting in a large distance between the collision number reference and the processing, a large tool stroke, and easy deviation.

[0086] Therefore, in this embodiment, if Figure 3 As shown, the center coordinates of each core hole are used as the collision number reference. Figure 3 It can be seen that the center coordinates of each core hole are (0.00, 0.00) in their respective coordinate systems, and the positions (coordinates) of each column foot surrounding the core hole are determined based on the center coordinates of the core hole, so that the column foot can accurately surround the core hole. Since the positions of the core hole and the column foot are directly relative, the distance between the two is more accurate, and the error can be effectively controlled to be less than 0.005MM, so that the concentricity between the column foot and the core hole can be higher. In addition, since the distance between the center of the core hole and the column foot, which is used as the reference for the number of collisions, is small, it can effectively avoid deviations caused by large distances and long tool travel, thereby further improving the processing accuracy.

[0087] Step 180 , according to the coordinates of each of the column feet, use the finishing equipment to form a plurality of column feet on the surface to be processed.

[0088] In this embodiment, a plurality of column foot positions are formed on the surface to be processed according to the coordinates of the column foot positions determined in the previous step.

[0089] In this embodiment, by taking the center coordinates of each core hole as the reference for the number of collisions, the error in the distance between the core hole and the column foot can be effectively reduced, and the concentricity between the column foot and the core hole can be improved. In this way, the error caused by determining the position of the column foot by the diagonal angle of the mold core is reduced, so that the concentricity of the front mold and the rear mold is higher, and the concentricity of the optical lens manufactured by the mold core is better, thereby improving the accuracy and optical performance of the optical lens.

[0090] In one embodiment, the step of detecting the size parameters of the surface to be processed of the mold core and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed comprises:

[0091] Acquiring an image of the surface to be processed of the mold core located on the finishing equipment by an image sensor to obtain an image of the surface to be processed;

[0092] Binarizing the image of the surface to be processed to obtain a binary image of the surface to be processed;

[0093] According to the structure of surface, line and point, the geometric features of the binary image are extracted to obtain the surface features, line features and point features of the surface to be processed;

[0094] Reconstructing a feature image of the surface to be processed by using the surface features, the line features and the point features to obtain a geometric feature map;

[0095] According to the geometric feature diagram, the size parameters of the surface to be processed of the mold core are detected, and based on the size parameters of the surface to be processed, a processing coordinate system of the surface to be processed is established.

[0096] In this embodiment, firstly, an image of the surface to be processed of the mold core is collected, and then the surface to be processed is binarized so that the image of the surface to be processed is binary in black and white, which is convenient for the feature recognition of the surface to be processed in the subsequent steps. In this embodiment, according to the structure of the surface, line and point on the surface to be processed, the geometric features of the binary image are extracted by using a preset geometric feature recognition algorithm to obtain the surface features, line features and point features of the surface to be processed, wherein the surface features reflect the size and overall contour of the surface to be processed, the line features reflect the features of the edge and structural lines on the surface to be processed, and the point features reflect the features of the intersection and angle position of the edges of the surface to be processed. In this embodiment, there is repetition between the surface features, line features and point features in the object structure, which can improve the redundancy of the features, facilitate the correction of the features, improve the accuracy of the features, and improve the robustness. Subsequently, the extracted surface features, line features and point features are used to reconstruct the image to obtain a geometric feature image, which is an image containing only the surface, line and point. In the process of reconstructing the image, the surface features, line features and point features are used to perform mutual correction to improve the accuracy. The reconstructed geometric feature map can accurately express the geometric features of the surface to be processed. Subsequently, the size parameters of the surface to be processed of the mold core are detected according to the geometric feature map, and the processing coordinate system of the surface to be processed is established using the size parameters of the surface to be processed obtained by the detection. The processing coordinate system can accurately reflect the coordinates and relative positional relationship of different positions on the surface to be processed. Through the above process, the accuracy and robustness of the processing coordinate system can be effectively improved, which is beneficial to subsequent processing, improves processing accuracy, and effectively improves the concentricity of the lens.

[0097] In one embodiment, the step of detecting the size parameters of the surface to be processed of the mold core according to the geometric feature map, and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed comprises:

[0098] According to the geometric characteristic diagram, detecting the dimensional parameters of the surface to be processed of the mold core;

[0099] Detecting whether the size parameters meet the concentricity accuracy conditions;

[0100] When the size parameters do not meet the concentricity accuracy condition, the geometric center of the surface to be processed is determined according to the size parameters of the surface to be processed, and a processing coordinate system of the surface to be processed is established with the geometric center of the surface to be processed as the coordinate origin.

[0101] In this embodiment, the concentricity accuracy condition refers to whether the common center surrounded by the core hole and the column foot coincides with the geometric center of the mold core after the simulation processing. If they coincide, the concentricity accuracy condition is met. If they do not coincide, the non-concentricity accuracy condition is not met. In this way, for mold cores that meet the concentricity accuracy condition and non-concentricity accuracy condition, a processing coordinate system can be established based on different methods. For example, when the size parameters do not meet the concentricity accuracy condition, it means that when the front mold and the rear mold are closed, they cannot be aligned according to the edge and diagonal alignment method, and must strictly rely on the column foot alignment. Therefore, when establishing a processing coordinate system at this time, the coordinate system should be established with the geometric center of the surface to be processed as the coordinate origin.

[0102] In this embodiment, the machining coordinate system of the machining surface is established with the geometric center of the machining surface as the coordinate origin. In this way, when the precision requirement of concentricity is not met, the coordinate system can be accurately established with the geometric center of the machining surface as the coordinate origin, so that each core hole and the column foot position can be centered. In this way, when the mold is subsequently closed, it is only necessary to align the column foot positions of the front mold and the rear mold to perform accurate mold closing.

[0103] In one embodiment, after the step of detecting whether the size parameter satisfies the concentricity accuracy condition, the step further includes:

[0104] When the size parameters meet the concentricity accuracy condition, the intersection point of two adjacent edges of the surface to be processed is determined according to the size parameters of the surface to be processed, and a processing coordinate system of the surface to be processed is established with the intersection point as the coordinate origin.

[0105] In this embodiment, the surface to be processed is a rectangle or a square, and the intersection of the adjacent sides of the surface to be processed is the diagonal corner of the surface to be processed. The basis for establishing the coordinate system in this embodiment is different from that in the above embodiment in that the coordinate origin of the processing coordinate system in this embodiment is the intersection of a pair of adjacent sides of the surface to be processed (i.e., the diagonal corner). It is worth mentioning that since the size parameters of the surface to be processed meet the concentricity accuracy requirements, the diagonal corner of the surface to be processed is used as the coordinate origin to establish the coordinates, which can meet the concentricity accuracy requirements.

[0106] In addition, it should be understood that in this embodiment, only the machining coordinate system is established with the intersection point to facilitate the determination of the coordinates of each core hole, while the coordinates of the column foot are still determined according to the center of the corresponding core hole. In this embodiment, the coordinates of the column foot are not directly determined with the machining coordinate system established with the intersection point. In this way, even if the concentricity accuracy requirement is not met, the coordinate system can be established without reworking the mold core.

[0107] It is worth mentioning that in the above embodiment, different methods are selected to establish the processing coordinate system according to whether the concentricity accuracy condition is met, thereby avoiding the discarding of the mold core due to different concentricity conditions and the waste of the mold core. Regardless of whether the concentricity accuracy condition is met, the mold core is retained. Subsequently, in the production process, it is only necessary to pair the front mold and the rear mold that meet the concentricity accuracy condition, and to pair the front mold and the rear mold that do not meet the concentricity accuracy condition, which can improve the accuracy and avoid the increase in cost due to discarding.

[0108] In one embodiment, the step of detecting whether the size parameter satisfies the concentricity accuracy condition comprises:

[0109] According to the size parameters of the surface to be processed, a test coordinate system is established with the intersection point of two adjacent edges of the surface to be processed as the coordinate origin;

[0110] Based on the test coordinate system, using the preset design parameters, determine the first test coordinate of the center of each core hole and the second test coordinate of each column foot position;

[0111] Calculate the test center coordinates of the surface to be processed according to the first test coordinates of the center of each core hole and the second test coordinates of each column foot position;

[0112] Determining the geometric center coordinates of the surface to be processed according to the size parameters of the surface to be processed;

[0113] Detecting whether the deviation between the test center coordinates and the geometric center coordinates is less than a preset threshold;

[0114] Among them, if the deviation between the test center coordinates and the geometric center coordinates is less than a preset threshold, the size parameter meets the concentricity accuracy condition; if the deviation between the test center coordinates and the geometric center coordinates is greater than or equal to the preset threshold, the size parameter does not meet the concentricity accuracy condition.

[0115] In this embodiment, in order to detect whether the dimensional parameters meet the concentricity accuracy requirements, it is necessary to establish a test coordinate system. First, a test coordinate system is established with the diagonal corner of the surface to be processed as the coordinate origin. On the basis of this test coordinate system, the preset design parameters are used to determine the first test coordinate of each core hole and the second test coordinate of each column foot. The reference systems of the first test coordinate and the second test coordinate are both test coordinate systems with the diagonal corner as the origin. Since each core hole should be distributed in a circular array with a certain coordinate as the center, and the corresponding column feet are distributed in a circular array with the corresponding core hole as the center, they are also symmetrically distributed with a certain coordinate as the center. In this way, the coordinates of the center of the circle can be calculated based on the first test coordinates of the center of the core hole and the second test coordinates of each column foot. The coordinates of the center of the circle are the test center coordinates.

[0116] It should be understood that the geometric center coordinates of the surface to be processed are the coordinates corresponding to the geometric center of the surface to be processed. Ideally, the test center coordinates should coincide with the geometric center coordinates of the surface to be processed, but there are also cases where the test center coordinates do not correspond to the geometric center coordinates of the surface to be processed. Therefore, it is necessary to detect whether the deviation between the test center coordinates and the geometric center coordinates is less than the preset threshold. When the deviation between the test center coordinates and the geometric center coordinates is less than the preset threshold, it means that the test center coordinates coincide with the geometric center coordinates, and the dimensional parameters meet the concentricity accuracy conditions. Therefore, even if the coordinate system is established with the diagonal corner as the coordinate origin, the coordinates of the core hole and the column foot can be accurately determined, so that each mold core can be accurately processed separately.

[0117] When the deviation between the test center coordinates and the geometric center coordinates is greater than or equal to the preset threshold, it means that the test center coordinates and the geometric center coordinates do not coincide, and the dimensional parameters do not meet the concentricity accuracy conditions. At this time, the positioning of the front mold and the rear mold depends only on the column feet. Therefore, it is only necessary to determine the center coordinates of the core hole according to the processing coordinate system, and determine the coordinates of the column feet based on the center coordinates of the core hole. Ensure that the relative position relationship between each column foot and the relative position relationship between each core hole meet the preset design parameters, and the front mold and the rear mold are aligned through each column foot.

[0118] In one embodiment, before the step of binarizing the image of the surface to be processed to obtain the binarized image of the surface to be processed, the step further includes:

[0119] Inputting the image of the surface to be processed into an image recognition model, using the image recognition model to identify a noise area in the image of the surface to be processed, and adding a noise mark to the noise area;

[0120] The step of performing binarization processing on the image of the surface to be processed to obtain the binarized image of the surface to be processed comprises:

[0121] According to the noise identification, the image of the surface to be processed is binarized, and the noise area corresponding to the noise identification is eliminated to obtain the binarized image of the surface to be processed.

[0122] In this embodiment, the noise area refers to the area where other structures are located except the surface to be processed and the structure on the surface to be processed, such as burrs and burrs formed by rough processing, other structures on the finishing equipment, and environmental structures around the mold core. The image of the noise area does not belong to the mold core or part of the surface to be processed, so this part of the area is regarded as the noise area. The image recognition model is a pre-trained neural network model, which is used to identify the surface to be processed and the noise area in the image. Specifically, in one embodiment, a plurality of sample images of the surface to be processed with noise areas are input into the neural network for learning. When the neural network model is stable, the image recognition model is obtained.

[0123] In this embodiment, the image recognition model can identify the noise area in the image of the surface to be processed. After the noise area is identified, a noise mark is added to the noise area, and the noise mark can be the contour line of the noise area. Then, in the process of binarization, according to the noise mark, each noise area is first uniformly binarized, and the pixel value of each noise area is set to 0 or 255, so that the pixel value of the noise area is the same as the background, so as to eliminate the noise area. Then, the binarization process eliminates the contour line of the noise area. In this way, the noise area is eliminated while the image of the surface to be processed is binarized. On the one hand, the noise area can be accurately eliminated, so that the binarized image of the image of the surface to be processed is more accurate. On the other hand, compared with the method of eliminating the noise area outside the binarization step, binarizing the noise area at the same time can effectively improve the processing efficiency and can retain the image details as much as possible, thereby improving the accuracy of the binarized image.

[0124] In one embodiment, the step of installing the rough-processed mold core on a finishing device and calibrating the flatness and verticality of the mold core on the finishing device comprises:

[0125] The mold core after rough processing is installed on a finishing device, and a distance meter is used to measure and obtain the three-dimensional characteristic parameters of the mold core;

[0126] According to the three-dimensional characteristic parameters, detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality;

[0127] When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, according to the preset flatness and the preset verticality, the robot arm is controlled to adjust the position and angle of the mold core on the finishing equipment to calibrate the flatness and verticality of the mold core on the finishing equipment;

[0128] When the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality, a three-dimensional model of the mold core is constructed according to the three-dimensional feature parameters.

[0129] In this embodiment, the rangefinder can be a laser rangefinder or other types of distance or length measuring instruments. The three-dimensional characteristic parameters are the parameters of the mold core and the structure on the mold core in the X-axis direction, Y-axis direction and Y-axis direction of space, and the parameters include the length, width and height of the mold core, the width of the surface to be processed of the mold core, and the width of the structure on the surface to be processed of the mold core. In this embodiment, multiple groups of laser rangefinders are used to move horizontally and vertically, and the size of the mold core is measured during the movement, thereby obtaining the overall three-dimensional characteristic parameters of the mold core.

[0130] Subsequently, the flatness and verticality of the mold core on the finishing equipment are detected using the three-dimensional feature parameters, wherein the flatness detection is to ensure that the surface to be processed is horizontal, and the verticality detection is to keep the surface to be processed horizontal on the one hand, and on the other hand, to align the position, direction and angle of the mold core on the finishing equipment with the preset processing station. For example, it is detected whether each side of the mold core is perpendicular to the corresponding reference line on the finishing equipment. When each side of the mold core is perpendicular to the corresponding reference line, it indicates that the verticality of the mold core meets the preset verticality. When the flatness and verticality of the mold core do not meet the preset flatness and preset verticality, the robot arm is controlled to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality to calibrate the flatness and verticality of the mold core on the finishing equipment, so that the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality. When the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality, the next step can be directly executed, and a three-dimensional model of the mold core is constructed according to the three-dimensional feature parameters. In this embodiment, calibrating the flatness and verticality of the mold core is beneficial to the precise processing in the subsequent steps to avoid errors. In addition, constructing a three-dimensional model of the mold core is beneficial to the subsequent calibration of the geometric features of the model.

[0131] In one embodiment, the step of reconstructing the feature image of the surface to be processed by using the surface features, the line features and the point features to obtain a geometric feature map comprises:

[0132] Analyze the three-dimensional model of the mold core to obtain the two-dimensional characteristic parameters of the surface to be processed;

[0133] Comparing the two-dimensional feature parameters with the surface features, the line features, and the point features, and establishing a corresponding relationship between the two-dimensional feature parameters and the surface features, the line features, and the point features;

[0134] Based on the correspondence between the two-dimensional feature parameters and the surface features, the line features and the point features, the corresponding surface features, the line features and the point features are constrained by using the two-dimensional feature parameters;

[0135] The feature image of the surface to be processed is reconstructed using the surface features, the line features and the point features to obtain a geometric feature map.

[0136] In this embodiment, the three-dimensional model of the mold core is first analyzed to obtain the two-dimensional feature parameters of the surface to be processed of the mold core, the two-dimensional feature parameters include surface feature parameters, line feature parameters and point feature parameters, the feature parameters may include position parameters, length parameters, distance parameters, angle parameters. In this embodiment, the two-dimensional feature parameters of the surface to be processed are used to constrain the surface features, line features and point features, so that the surface features, line features and point features can be expressed more accurately, thereby making the constructed geometric feature map of the surface to be processed more accurate.

[0137] In one embodiment, the step of measuring the three-dimensional characteristic parameters of the mold core using a rangefinder includes:

[0138] Acquire a reference three-dimensional model, wherein the reference three-dimensional model records the three-dimensional parameters of the standard mold core and the measurement reference of the mold core;

[0139] Using a distance meter to measure and obtain geometric parameters of at least one side edge of the mold core;

[0140] Using geometric parameters of at least one side edge of the mold core, constructing a three-dimensional detection coordinate;

[0141] Extracting a measurement reference from the reference three-dimensional model, and determining a measurement position and a measurement angle of a rangefinder based on the three-dimensional detection coordinates and the measurement reference;

[0142] Adjust the position and angle of the rangefinder based on the measurement position and the measurement angle, and obtain the three-dimensional characteristic parameters of the mold core by measuring with the rangefinder;

[0143] The step of detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality according to the three-dimensional feature parameters comprises:

[0144] Acquire the three-dimensional reference coordinates of the finishing equipment;

[0145] According to the three-dimensional reference coordinates of the equipment and the three-dimensional characteristic parameters, detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality;

[0146] When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, the step of controlling the robot arm to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality to calibrate the flatness and verticality of the mold core on the finishing equipment comprises:

[0147] When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, the robotic arm is controlled to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality so that the three-dimensional detection coordinates coincide with the three-dimensional reference coordinates of the equipment to calibrate the flatness and verticality of the mold core on the finishing equipment.

[0148] In this embodiment, the reference three-dimensional model is a three-dimensional model of a standard mold core. In this embodiment, the three-dimensional model of a standard mold core is used as a reference. The measurement reference is to measure the position of the key points of the mold core. By measuring the distance, length, relative position, etc. of multiple key points on the mold core, all three-dimensional feature parameters of the mold core can be obtained by calculation. Therefore, in this embodiment, the geometric parameters of one side of the mold core are first measured, such as the distance between the two ends of one side of the mold core (referring to the distance between the measuring point), the height of the two ends, and the distance between the two ends, and the measured geometric parameters of the side are used as the reference of the coordinates to establish a three-dimensional detection coordinate. The establishment reference of the three-dimensional detection coordinate is the mold core placed on the finishing equipment. Subsequently, according to the measurement references recorded in the three-dimensional model of the standard mold core, the position of the key points to be measured is found, and combined with the three-dimensional detection coordinates, multiple measurement positions of the rangefinder and the measurement angles corresponding to the measurement positions are clarified, and the mold core is measured at different measurement positions and different measurement angles, and the overall three-dimensional feature parameters of the mold core are obtained. Different from the three-dimensional feature parameters in the previous embodiment, the three-dimensional feature parameters in the previous embodiment also include the relative position and angle with the reference line of the finishing equipment. After adjusting the position and angle of the mold core, it is necessary to measure the three-dimensional feature parameters of the mold core again, and construct the three-dimensional model of the mold core based on the re-measured three-dimensional feature parameters. The three-dimensional feature parameters in this embodiment are established based on the three-dimensional detection coordinates of the mold core itself. Therefore, in this embodiment, no matter how the position and angle of the mold core are adjusted subsequently, the three-dimensional feature parameters of the mold core are not affected. In this way, when constructing the three-dimensional model of the mold core subsequently, there is no need to measure the three-dimensional feature parameters again due to the change of the position and angle of the mold core on the finishing equipment, which improves the efficiency of constructing the three-dimensional model of the mold core. In addition, the two-dimensional feature parameters of the surface to be processed can also be accurately used to constrain the corresponding surface features, the line features and the point features.

[0149] In addition, the three-dimensional feature parameters in this embodiment are measured based on the three-dimensional detection coordinates of the mold core itself, so the three-dimensional feature parameters include the three-dimensional detection coordinates. Therefore, when detecting the preset flatness and preset verticality of the mold core, the three-dimensional reference coordinates of the equipment, the three-dimensional detection coordinates and the three-dimensional feature parameters can be used for detection, and when the flatness and verticality of the mold core do not meet the preset flatness and preset verticality, the position of the mold core can be adjusted so that the three-dimensional detection coordinates coincide with the three-dimensional reference coordinates of the equipment, thereby facilitating the subsequent finishing of the mold core. It is worth mentioning that the three-dimensional reference coordinates of the equipment in this embodiment are reference coordinates established based on the finishing equipment. In this way, after the three-dimensional detection coordinates coincide with the three-dimensional reference coordinates of the equipment, there is no need to detect the three-dimensional feature parameters of the mold core again, and the three-dimensional feature parameters can be directly used to construct a three-dimensional model in the subsequent steps.

[0150] In one embodiment, the step of taking the center of the core hole as a collision number reference and determining the coordinates of the column foot positions corresponding to each core hole based on the collision number reference includes:

[0151] Taking the center coordinates of each core hole as the coordinate origin, a plurality of reference sub-coordinate systems are established respectively;

[0152] The center of the core hole is used as the collision number reference, and based on each reference sub-coordinate system and using the preset design parameters, the coordinates of the column foot position corresponding to each core hole are determined.

[0153] In this embodiment, after the machining coordinate system is established, the preset design parameters are used on the machining coordinate system to determine the center coordinates of the core hole on the machining coordinate system. Subsequently, multiple reference sub-coordinate systems are established again with the center coordinates of the core hole as the coordinate origin, and each reference sub-coordinate system is used to calibrate the coordinates of the column foot corresponding to the core hole. It should be understood that the outer side of each core hole is surrounded by multiple column feet, so that the coordinates of the column foot can be determined by the center coordinates of the core hole, thereby reducing the distance error between the column foot and the core hole, and effectively improving the accuracy of the column foot. Moreover, with the center of the core hole as the reference number, each column foot can be accurately processed.

[0154] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0155] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for manufacturing an optical lens mold, characterized in that: include: Provide molds; Performing rough processing on the mold core to obtain a roughly processed mold core; Installing the rough-processed mold core on a finishing device, and calibrating the flatness and verticality of the mold core on the finishing device; Detecting the size parameters of the surface to be processed of the mold core, and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed; Based on the machining coordinate system, the center coordinates of each core hole are determined using preset design parameters; According to the center coordinates of each of the core holes, a plurality of core holes are formed on the surface to be processed by using the finishing equipment; Taking the center of the core hole as a collision number reference, and determining the coordinates of the column foot position corresponding to each core hole based on the collision number reference; According to the coordinates of each of the column foot positions, the finishing equipment is used to form a plurality of column foot positions on the surface to be processed.

2. The method for making an optical lens mold according to claim 1, characterized in that: The step of detecting the size parameters of the surface to be processed of the mold core and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed comprises: Acquiring an image of the surface to be processed of the mold core located on the finishing equipment by an image sensor to obtain an image of the surface to be processed; Binarizing the image of the surface to be processed to obtain a binary image of the surface to be processed; According to the structure of surface, line and point, the geometric features of the binary image are extracted to obtain the surface features, line features and point features of the surface to be processed; Reconstructing a feature image of the surface to be processed by using the surface features, the line features and the point features to obtain a geometric feature map; According to the geometric feature diagram, the size parameters of the surface to be processed of the mold core are detected, and based on the size parameters of the surface to be processed, a processing coordinate system of the surface to be processed is established.

3. The method for making an optical lens mold according to claim 2, characterized in that: The step of detecting the size parameters of the surface to be processed of the mold core according to the geometric feature map, and establishing a processing coordinate system of the surface to be processed based on the size parameters of the surface to be processed comprises: According to the geometric characteristic diagram, detecting the dimensional parameters of the surface to be processed of the mold core; Detecting whether the size parameters meet the concentricity accuracy conditions; When the size parameters do not meet the concentricity accuracy condition, the geometric center of the surface to be processed is determined according to the size parameters of the surface to be processed, and a processing coordinate system of the surface to be processed is established with the geometric center of the surface to be processed as the coordinate origin.

4. The method for making an optical lens mold according to claim 3, characterized in that: After the step of detecting whether the size parameters meet the concentricity accuracy condition, the following step is further included: When the size parameters meet the concentricity accuracy condition, the intersection point of two adjacent edges of the surface to be processed is determined according to the size parameters of the surface to be processed, and a processing coordinate system of the surface to be processed is established with the intersection point as the coordinate origin.

5. The method for making an optical lens mold according to claim 3, characterized in that: The step of detecting whether the size parameters meet the concentricity accuracy condition comprises: According to the size parameters of the surface to be processed, a test coordinate system is established with the intersection point of two adjacent edges of the surface to be processed as the coordinate origin; Based on the test coordinate system, using the preset design parameters, determine the first test coordinate of the center of each core hole and the second test coordinate of each column foot position; Calculate the test center coordinates of the surface to be processed according to the first test coordinates of the center of each core hole and the second test coordinates of each column foot position; Determining the geometric center coordinates of the surface to be processed according to the size parameters of the surface to be processed; Detecting whether the deviation between the test center coordinates and the geometric center coordinates is less than a preset threshold; Among them, if the deviation between the test center coordinates and the geometric center coordinates is less than a preset threshold, the size parameter meets the concentricity accuracy condition; if the deviation between the test center coordinates and the geometric center coordinates is greater than or equal to the preset threshold, the size parameter does not meet the concentricity accuracy condition.

6. The method for making an optical lens mold according to claim 2, characterized in that: Before the step of binarizing the image of the surface to be processed to obtain the binarized image of the surface to be processed, the method further includes: Inputting the image of the surface to be processed into an image recognition model, using the image recognition model to identify a noise area in the image of the surface to be processed, and adding a noise mark to the noise area; The step of performing binarization processing on the image of the surface to be processed to obtain the binarized image of the surface to be processed comprises: According to the noise identification, the image of the surface to be processed is binarized, and the noise area corresponding to the noise identification is eliminated to obtain the binarized image of the surface to be processed.

7. The method for making an optical lens mold according to claim 2, characterized in that: The step of installing the rough-processed mold core on a finishing device and calibrating the flatness and verticality of the mold core on the finishing device comprises: The mold core after rough processing is installed on a finishing device, and a distance meter is used to measure and obtain the three-dimensional characteristic parameters of the mold core; According to the three-dimensional characteristic parameters, detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality; When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, according to the preset flatness and the preset verticality, the robot arm is controlled to adjust the position and angle of the mold core on the finishing equipment to calibrate the flatness and verticality of the mold core on the finishing equipment; When the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality, a three-dimensional model of the mold core is constructed according to the three-dimensional feature parameters.

8. The method for manufacturing an optical lens mold according to claim 7, characterized in that: The step of reconstructing the feature image of the surface to be processed by using the surface features, the line features and the point features to obtain a geometric feature map comprises: Analyze the three-dimensional model of the mold core to obtain the two-dimensional characteristic parameters of the surface to be processed; Comparing the two-dimensional feature parameters with the surface features, the line features, and the point features, and establishing a corresponding relationship between the two-dimensional feature parameters and the surface features, the line features, and the point features; Based on the correspondence between the two-dimensional feature parameters and the surface features, the line features and the point features, the corresponding surface features, the line features and the point features are constrained by using the two-dimensional feature parameters; The feature image of the surface to be processed is reconstructed using the surface features, the line features and the point features to obtain a geometric feature map.

9. The method for making an optical lens mold according to claim 7, characterized in that: The step of measuring the three-dimensional characteristic parameters of the mold core by using a rangefinder comprises: Acquire a reference three-dimensional model, wherein the reference three-dimensional model records the three-dimensional parameters of the standard mold core and the measurement reference of the mold core; Using a distance meter to measure and obtain geometric parameters of at least one side edge of the mold core; Using geometric parameters of at least one side edge of the mold core, constructing a three-dimensional detection coordinate; Extracting a measurement reference from the reference three-dimensional model, and determining a measurement position and a measurement angle of a rangefinder based on the three-dimensional detection coordinates and the measurement reference; Adjust the position and angle of the rangefinder based on the measurement position and the measurement angle, and obtain the three-dimensional characteristic parameters of the mold core by measuring with the rangefinder; The step of detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality according to the three-dimensional feature parameters comprises: Acquire the three-dimensional reference coordinates of the finishing equipment; According to the three-dimensional reference coordinates of the equipment and the three-dimensional characteristic parameters, detecting whether the flatness and verticality of the mold core on the finishing equipment meet the preset flatness and preset verticality; When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, the step of controlling the robot arm to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality to calibrate the flatness and verticality of the mold core on the finishing equipment comprises: When the flatness and verticality of the mold core on the finishing equipment do not meet the preset flatness and preset verticality, the robotic arm is controlled to adjust the position and angle of the mold core on the finishing equipment according to the preset flatness and the preset verticality so that the three-dimensional detection coordinates coincide with the three-dimensional reference coordinates of the equipment to calibrate the flatness and verticality of the mold core on the finishing equipment.

10. The method for manufacturing an optical lens mold according to any one of claims 1 to 9, characterized in that: The step of taking the center of the core hole as a collision number reference and determining the coordinates of the column foot positions corresponding to each core hole based on the collision number reference comprises: Taking the center coordinates of each core hole as the coordinate origin, a plurality of reference sub-coordinate systems are established respectively; The center of the core hole is used as the collision number reference, and based on each reference sub-coordinate system and using the preset design parameters, the coordinates of the column foot position corresponding to each core hole are determined.

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