Molding method based on outer contour curve of lens and corresponding thickness measurement

Abstract

The invention provides a forming method based on a lens outer contour curve and corresponding thickness measurement, and relates to the technical field of glasses lens processing. The forming method based on the outer contour curve of the lens and the corresponding thickness measurement comprises the following steps: S1, preparing a two-dimensional diagram of the outer contour of the lens; s2, generating a corresponding outer contour tool path in a control system according to the two-dimensional diagram; s3, measuring curve and thickness data of the lens; s4, superposing into a three-dimensional graph through software synthesis operation, and displaying the three-dimensional graph on a control interface; and S5, an operator selects a needed machining process, and full-automatic machining operation is completed. According to the method, the method is mainly applied to five-axis machine tool machining of the lens or five-axis machine tool machining of a similar process, the three-dimensional graph of the lens can be rapidly combined, the tool path is generated through operation of software, and the method has unique advantages for automatic production of small-batch products with non-standard properties.

Description

Technical Field

[0001] The present invention relates to the technical field of spectacle lens processing, and specifically to a forming method based on the measurement of the outer contour curve of the lens and its corresponding thickness. Background Art

[0002] Before the emergence of lens processing equipment, lens processing mainly relied on manual skills. The production of early glasses can be traced back hundreds of years, when craftsmen used simple tools such as grindstones and handheld clamps to grind and polish lenses. This manual processing method was extremely inefficient, and it might take several hours or even days to produce a single lens.

[0003] With the rapid development of computer and automation technologies, revolutionary changes have been brought to lens processing equipment. Computer numerical control (CNC) technology has been applied to lens processing equipment, enabling precise programming control of the lens processing process.

[0004] However, the measurement structure of existing lens processing equipment is to collect sensor data changes, mainly for finding the center of the lens section, providing a reference for the processing of the convex platform of full-frame lenses and the fish wire groove of semi-frame lenses. This measurement structure can only provide a single-directional dimension change mode and can only be applied to the processing of a single process, and cannot provide complete data services for subsequent diamond chamfering, engraving, cutting, grinding and polishing, etc. Since the data provided is single-directional change data and cannot be integrated with post-processing, the functions of the machine tool are greatly lacking, increasing the workload of subsequent processing and reducing the use value of the processing equipment.

[0005] Therefore, those skilled in the art have provided a forming method based on the measurement of the outer contour curve of the lens and its corresponding thickness to solve the problems raised in the above background art. Summary of the Invention

[0006] (1) Technical Problems to be Solved

[0007] In view of the deficiencies of the prior art, the present invention provides a forming method based on the measurement of the outer contour curve of the lens and its corresponding thickness, which solves the problem that the existing lens measurement structure can only provide a single-directional dimension change mode, can only be applied to the processing of a single process, and cannot provide complete data services for subsequent diamond chamfering, engraving, cutting, grinding and polishing, etc.

[0008] (2) Technical Solutions

[0009] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0010] A forming method based on the measurement of the outer contour curve of the lens and its corresponding thickness includes the following steps:

[0011] Step S1. First, prepare a two-dimensional drawing of the lens outer contour, which can be obtained by manual drawing, camera photographing, or mechanical scanning;

[0012] Step S2. Generate the corresponding outer contour tool path in the control system according to the two-dimensional drawing;

[0013] Step S3. Next, use a metal measuring head to clamp the lens, and start the servo motor to rotate 360 degrees, so that the metal measuring head moves along the outer contour tool path. The displacement sensor will start to measure along the edited outer contour edge of the lens, generating numerical changes in the relative direction, and obtaining different curve and thickness data;

[0014] Step S4. Transmit the obtained curve and thickness data to the control system, and the control system synthesizes and superimposes them into a three-dimensional graph through software operations and displays it on the control interface;

[0015] Step S5. Then, the operator selects the required processing technology, such as chamfering, grooving, engraving, edge cutting, polishing, etc., sets the corresponding data to generate a program, and then performs a full-automatic processing operation from loading to completion;

[0016] Through the above technical solution, the data measured from the existing two-dimensional drawing contour is superimposed to generate three-dimensional graphic data, and the machining tool path is directly generated in combination with the operations of the control software. Moreover, the dimensions can be recalled and edited again to maximize the machining performance of the machine tool. The complete machining of the lens is achieved in one clamping, and the measuring instrument and camera data are combined to form a three-dimensional graph of the lens, providing complete data support for expanding the use functions of the machine tool and meeting the requirements of convenient machining technology.

[0017] Further, in step S3, after the metal measuring head reaches the measuring position, the air cylinder retracts, the metal measuring head clamps the lens, and the lens clamped by the lens clamping head on the lens clamping mechanism is rotated 360 degrees by the drive of the servo motor. The displacement sensor will start to measure along the edited outer contour edge of the lens and generate numerical changes in the relative direction.

[0018] Further, the measuring instrument used in the measuring method adopts two opposite metal measuring heads. The two metal measuring heads are fixed on two sliders of the same linear guide. A spring is used to pull the two ends in the middle to make the two metal measuring heads contact each other. And a roller is provided on each slider at the bottom of each metal measuring head, and a micro cylinder of model CDQ2B-16 is used to press against the two rollers, which can open the two metal measuring heads by a certain distance.

[0019] Further, the two metal measuring heads of the measuring instrument are insulated from each other, equivalent to two normally open contacts. When the outer contour of the blank lens during the measurement is smaller than the outer contour of the cutting and forming, the two metal measuring heads will touch each other and conduct, causing the servo motor that drives the rotation of the lens to stop and alarm. The measuring instrument returns to the initial position, thereby preventing damage to the measuring instrument caused by continuous rotation.

[0020] Further, two displacement sensors are provided on the measuring instrument, with opposite measuring directions. The body of the displacement sensor is fixed on the frame, and the sensing end is fixed on the two sliders. The metal measuring heads can move independently under the action of an external force, causing the displacement sensor to generate two sets of moving distance data.

[0021] Further, a settable reference position is provided at the clamping position of the measuring instrument relative to the lens. The two sets of sensor data obtained are compared and calculated inside the controller. When the lens rotates 360 degrees, relatively accurate thickness and curve data can be obtained.

[0022] Further, after the two-dimensional graph is set with dimensions, a measurement path is generated. The measured data is superimposed and coincided with the original two-dimensional graph, and a complete three-dimensional graph data is generated through logical operations. This graph data is stored in the database for direct editing and calling during the next processing. Through the operation of the control software, a machining tool path is generated for automatic machining.

[0023] (III) Beneficial effects

[0024] The present invention provides a method for measuring and forming based on the outer contour curve of the lens and its corresponding thickness, having the following beneficial effects:

[0025] 1. The present invention provides a method for measuring and forming based on the outer contour curve of the lens and its corresponding thickness. According to the data measured according to the contour of the existing two-dimensional graph, a three-dimensional graph data is generated by superposition. Combining with the operation of the control software, a machining tool path is directly generated, and the dimensions can be called and edited again to maximize the machining performance of the machine tool. The complete machining of the lens is realized in one clamping, and the data of the measuring instrument and the camera are combined to form a three-dimensional graph of the lens, providing complete data support for expanding the use function of the machine tool and meeting the convenient machining process requirements.

[0026] 2. The present invention provides a method for measuring and forming based on the outer contour curve of a lens and its corresponding thickness. This method is mainly applied to the five-axis machining of lenses on a five-axis machine tool or similar processes, and can quickly combine into a three-dimensional graph of the lens. By operating with the built-in software to generate a tool path, it has unique advantages for the automated production of small batches of non-standard products. Compared with the current method of obtaining a three-dimensional graph through drawing or three-dimensional scanning, first, it omits the participation of professional drawing technicians, and second, it saves the cost of expensive three-dimensional laser scanners, which is of great significance from the perspective of customer use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An isometric view of the measuring instrument of the present invention;

[0028] Figure 2 A schematic diagram showing the structural composition of the measuring instrument of the present invention;

[0029] Figure 3 A schematic diagram showing the structural composition of the lens clamping mechanism of the present invention.

[0030] Among them, 1. Frame; 2. Measuring instrument; 3. Lens clamping mechanism; 4. Linear guide; 5. Slide block; 6. Roller; 7. Micro cylinder; 8. Metal measuring head; 9. Servo motor; 10. Lens clamping head. DETAILED DESCRIPTION OF THE INVENTION

[0031] Next, the technical solutions in the specific embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the specific embodiments of the present invention. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, rather than all of the specific embodiments. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0033] The specific embodiment of the present invention provides a method for measuring and forming based on the outer contour curve of a lens and its corresponding thickness, including the following steps:

[0034] Step S1. First, prepare a two-dimensional graph of the outer contour of the lens, which can be obtained by manual drawing, camera photographing or mechanical scanning;

[0035] Step S2. Generate a corresponding outer contour tool path in the control system according to the two-dimensional graph;

[0036] Step S3. Secondly, use the metal measuring head 8 to clamp the lens, and start the servo motor 9 to rotate 360 degrees, so that the metal measuring head 8 moves along the outer contour tool path. The displacement sensor will start to measure along the edited outer contour edge of the lens, generating numerical changes in the relative direction, and obtaining different curve and thickness data;

[0037] Step S4. Transmit the obtained curve and thickness data to the control system. The control system synthesizes and operates through software to superimpose them into a three-dimensional graph and display it on the control interface.

[0038] Step S5. Then, the operator selects the required processing techniques, such as chamfering, grooving, engraving, edge cutting, polishing, etc. After setting the corresponding data, a program is generated, and then a full-automatic processing operation from loading to completion is carried out.

[0039] Through the above technical solution, the data measured from the existing two-dimensional drawing contour is superimposed to generate three-dimensional graphic data. Combining with the operation of the control software, the machining tool path is directly generated, and the dimensions can be called and edited again to maximize the machining performance of the machine tool. The complete machining of the lens is realized in one clamping, and the data of the measuring instrument and the camera are combined to form a three-dimensional graph of the lens, providing complete data support for expanding the use function of the machine tool and meeting the convenient machining process requirements.

[0040] In step S3, after the metal measuring head 8 reaches the measuring position, the air cylinder retracts. The metal measuring head 8 clamps the lens, and the lens clamped by the lens clamping head 10 on the lens clamping mechanism 3 is driven by the servo motor 9 to rotate 360 degrees. The displacement sensor starts to measure along the edited outer contour edge of the lens and generates numerical changes in the relative direction.

[0041] Refer to Figures 1 - 3 As shown, the measuring instrument 2 used in the measuring method adopts two opposite metal measuring heads 8. The two metal measuring heads 8 are fixed on two sliders 5 of the same linear guide 4. A spring is used to pull both ends in the middle to make the two metal measuring heads 8 contact each other. And a roller 6 is provided on each slider 5 at the bottom of each metal measuring head 8, and a miniature air cylinder 7 of model CDQ2B-16 is used to push against the two rollers 6, which can open the two metal measuring heads 8 by a certain distance.

[0042] The two metal measuring heads 8 of the measuring instrument 2 are insulated from each other and are equivalent to two normally open contacts. When the outer contour of the blank lens during the measurement is smaller than the outer contour of the cut and formed lens, the two metal measuring heads 8 will touch each other and conduct, the servo motor 9 driving the rotation of the lens stops and alarms, and the measuring instrument returns to the initial position, thereby preventing the continuous rotation from damaging the measuring instrument 2.

[0043] Two displacement sensors are provided on the measuring instrument 2 with opposite measuring directions. The displacement sensor body is fixed on the frame 1, and the sensing end is fixed on the two sliders 5. The metal measuring heads 8 can move independently under the action of external force, causing the displacement sensor to generate two-way moving distance data.

[0044] A settable reference position is provided at the clamping position of the measuring instrument 2 relative to the lens. Inside the controller, the two-way sensor data obtained is compared and calculated. After the lens rotates 360 degrees, relatively accurate thickness and curve data can be obtained.

[0045] After the two-dimensional graph is set with dimensions, a measurement path is generated. The measured data is superimposed and coincided with the original two-dimensional graph, and a complete three-dimensional graph data is generated through logical operations. This graph data is stored in the database for direct editing and calling during the next processing. Through the operation of the control software, a machining tool path is generated for automatic machining.

[0046] In the present invention, this method is mainly applied to the five-axis machining of lenses or the five-axis machining of similar processes. It can quickly combine into a three-dimensional graph of the lens, generate a tool path through the operation of the built-in software, and has unique advantages for the automated production of small batches of products with non-standard properties. Compared with the current method of obtaining three-dimensional graphs through drawing or three-dimensional scanning, firstly, the participation of professional drawing technicians is omitted, and secondly, the cost of expensive three-dimensional laser scanners is saved, which is of great significance from the perspective of customer use.

[0047] Although specific embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these specific embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molding method based on the outer contour curve of a lens and its corresponding thickness measurement, characterized in that: The following steps are involved: Step S1. First, prepare a two-dimensional image of the outer contour of the lens, which can be obtained by manual drawing, camera photography or mechanical scanning; Step S2. Generate a corresponding outer contour tool path in the control system according to the two-dimensional graph; Step S3. Next, the metal measuring head (8) is used to clamp the lens, and the servo motor (9) is started to rotate 360 ​​degrees, so that the metal measuring head (8) moves according to the outer contour tool path, and the displacement sensor starts to measure along the edited outer contour edge of the lens, generating a value change in a relative direction, and obtaining different curves and thickness data; Step S4. The obtained curve and thickness data are transmitted to the control system, and the control system superimposes the obtained curve and thickness data into a three-dimensional graph through software synthesis operation and displays it on the control interface; Step S5. The operator then selects the required processing technology, such as chamfering, grooving, engraving, trimming, and polishing, generates a program after setting the corresponding data, and then performs fully automatic processing operations from loading to completion.

2. The forming method based on the lens outer contour curve and its corresponding thickness measurement according to claim 1, characterized in that: In step S3, after the metal measuring head (8) reaches the measuring position, the cylinder retracts, the metal measuring head (8) clamps the lens, and the lens clamped by the lens clamping head (10) on the lens clamping mechanism (3) is driven by the servo motor (9) to rotate 360 ​​degrees, and the displacement sensor starts measuring along the edited outer contour edge of the lens, and generates a numerical change in the relative direction.

3. The forming method based on the lens outer contour curve and its corresponding thickness measurement according to claim 1, characterized in that: The measuring instrument (2) used in the measuring method adopts two opposed metal measuring heads (8), the two metal measuring heads (8) are fixed on two sliders (5) of the same linear rail (4), a spring is used in the middle to pull the two ends so that the two metal measuring heads (8) are in contact with each other, and a roller (6) is provided on the slider (5) at the bottom of each metal measuring head (8), and a micro cylinder (7) with a model number of CDQ2B-16 is used to support the two rollers (6), so that the two metal measuring heads (8) can be opened a certain distance.

4. The forming method based on the lens outer contour curve and its corresponding thickness measurement according to claim 3, characterized in that: The two metal measuring heads (8) of the measuring instrument (2) are insulated from each other and are equivalent to two normally open contacts. When the outer contour of the blank lens is smaller than the outer contour of the cut lens during the measurement process, the two metal measuring heads (8) will touch each other and be turned on, and the servo motor (9) driving the lens to rotate will stop and alarm, and the measuring instrument will return to the initial position, thereby preventing the measuring instrument (2) from being damaged by continued rotation.

5. The forming method based on the lens outer contour curve and its corresponding thickness measurement according to claim 3, characterized in that: The measuring instrument (2) is provided with two displacement sensors with opposite measuring directions. The displacement sensor body is fixed on the frame (1), and the sensing end is fixed on the two slide blocks (5). The metal measuring heads (8) can move independently under the push of an external force, so that the displacement sensors generate two paths of moving distance data.

6. The forming method based on the lens outer contour curve and its corresponding thickness measurement according to claim 3, characterized in that: The measuring instrument (2) is provided with a settable reference position relative to the clamping position of the lens, and the two sensor data obtained are compared and calculated inside the controller. When the lens is rotated 360 degrees, relatively accurate thickness and curve data can be obtained.

7. The forming method based on the lens outer contour curve and its corresponding thickness measurement according to claim 1, characterized in that: The two-dimensional graphic generates a measurement path after size setting, and the measured data is superimposed and overlapped with the original two-dimensional graphic. After logical operation, a complete three-dimensional graphic data is generated, and the graphic data is stored in the database for direct editing and calling during the next processing. The control software calculates and generates a processing tool path for automatic processing.

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