Liquid crystal substrate glass precision cutting processing precision improving device and method

Abstract

The application discloses a liquid crystal substrate glass fine cutting processing precision improving device and method, and the device comprises a support positioning assembly, a visual measurement assembly and a central control assembly; the support positioning assembly is arranged at a cutting station of a cold end fine cutting production line and is used for stress-free fixing of glass to be cut; the visual measurement assembly is connected with a scribe cutting mechanism and is used for collecting a scribe starting edge and a pre-cut cutting line position image in real time; the central control assembly is electrically connected with each component, receives image data, completes deviation correction calculation, controls the start and stop of the support positioning assembly and compensates the cutting position of the scribe cutting mechanism. The application replaces traditional mechanical positioning with visual online measurement, combines with PLC closed loop operation compensation, dynamically adjusts a scribe point position, avoids the influence of shutdown operation and maintenance and replacement of consumables on size stability, realizes rapid machine recovery of a production line, effectively solves problems such as that fine cutting size is easily interfered by external factors, that a broken plate is caused by differences in incoming materials and plate placement, and that a scribe starting position is unstable, and guarantees the stability of cutting size and processing quality.

Description

Technical Field

[0001] This invention belongs to the field of cold-end cutting technology for liquid crystal substrate glass, specifically to a device and method for improving the precision of liquid crystal substrate glass cutting. Background Technology

[0002] Liquid crystal substrate glass is a core material in the flat panel display industry, mainly used in the manufacturing of various liquid crystal display devices such as LCD monitors, LCD TVs, and automotive display panels. It is a key component that determines the imaging accuracy, structural stability, and product yield of the display panel. Its production process is divided into two core stages: hot-end forming and cold-end processing. Cold-end processing is a fine-tuning process after glass forming, which includes cutting, grinding, cleaning, and inspection. Its main function is to process the large-size raw glass sheet formed by hot-end forming into a standard-sized substrate that meets the customized specifications of downstream panel manufacturers. Downstream display panel manufacturers have extremely stringent requirements for the dimensional accuracy of liquid crystal substrate glass. The standard for controlling dimensional deviations must be within ±200μm. Once the size exceeds this tolerance range, it will directly lead to the inability to carry out subsequent panel bonding and module assembly processes normally, or even cause the entire batch of display panels to be scrapped. Therefore, precise dimensional control in the cold-end processing stage is a core control point for ensuring product quality and controlling production costs in the entire liquid crystal substrate glass production process.

[0003] In the actual production process of cold-end processing of LCD substrate glass, the final dimensional accuracy of the product is affected by both the cutting and grinding processes. The grinding process mainly involves fine grinding of the edges after glass cutting. In conventional processes, the grinding amount is controlled within 150μm. Grinding operations within this range have a minimal impact on the overall dimensional shape of the glass and almost do not cause dimensional deviations. Therefore, the final dimension of the LCD substrate glass after cold-end processing depends primarily on the processing accuracy of the cutting process. However, the dimensional stability of the cutting process is easily affected by various equipment maintenance and operating condition changes, including regular equipment maintenance shutdowns, cutting wheel wear and replacement, tool holder disassembly and replacement, and replacement of various components in the scribing transmission mechanism. The cutting wheel and tool holder themselves have manufacturing errors, and assembly errors occur during assembly. In addition, the position reset deviation after the replacement of equipment components will directly cause the cutting size to deviate. Furthermore, the deviation of the stop conveying position of the glass product in the current process and the original size deviation of the formed glass in the previous process will further aggravate the fluctuation of the cutting size. This will not only cause the product size to exceed the tolerance range required by the downstream, but also significantly increase the glass breakage rate, and even cause production accidents with continuous large-area breakage. At the same time, during the conveying and positioning of the glass product, the starting scribe position of the cutting cannot be accurately fixed due to the fluctuation of the upstream incoming material size and the deviation of the conveying path. This directly affects the positioning accuracy and processing consistency of the cutting process.

[0004] To address the issues of unstable starting positions for scribing and dimensional deviations caused by glass positioning errors in the cutting process, existing LCD substrate glass cold-end processing production lines generally employ the traditional mechanical positioning and straightening technology. The core of this technology involves using mechanical clamping mechanisms and mechanical stops, among other hardware devices, to physically limit and straighten the position of the glass products conveyed to the cutting station. By fixing the physical position of these mechanical devices, the conveying posture and placement of the glass are forcibly corrected, thereby locking the starting point of the scribing and ensuring the relative position of the cutting station remains fixed. This mitigates some of the impact of incoming glass offset and conveying position fluctuations. This solution is currently the mainstream positioning method in the industry, suitable for conventional continuous production. It requires no complex electronic control systems, has simple operating logic, and can adapt to the continuous production needs under most conventional operating conditions. It is a commonly used positioning method for small and medium-sized substrate glass processing production lines.

[0005] While traditional mechanical positioning and alignment solutions can achieve basic glass positioning, they suffer from numerous unavoidable technical flaws in actual mass production. Overall adaptability and safety are poor. When the glass product transported from upstream processes is slightly larger than the standard size, the mechanical clamping mechanism, during its rigid clamping and alignment process, is prone to crushing the glass edges due to excessive clamping force or positional deviation. Alternatively, the glass may experience hard friction and misalignment with the supporting platform below, resulting in scratches, chipping, and other surface defects, directly reducing product yield. Furthermore, when the positional deviation during upstream glass transport exceeds the flexible buffer range of the mechanical stops, the glass will impact the stops, causing large-scale shattering and triggering batch production failures. Additionally, mechanical positioning cannot adaptively adjust clamping force and limit positions, resulting in poor adaptability to glass products of different thicknesses and sizes. Long-term use can exacerbate positioning deviations due to wear and tear on mechanical components. Ultimately, it fails to fundamentally solve the core problems of unstable cutting dimensions and easy glass damage during positioning, making it difficult to meet the current high-precision, high-yield production requirements of high-end LCD substrate glass. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention discloses a device and method for improving the precision of liquid crystal substrate glass cutting. It replaces traditional mechanical positioning with online visual measurement, using a camera to collect real-time data on the actual edge of the glass and the position of the cutting line. The marking points are dynamically adjusted based on the actual glass position, and PLC closed-loop calculation compensation is used. This ensures that the dimensional stability is not affected after equipment downtime for maintenance or replacement of consumables, and the production line can be quickly restarted. It effectively solves the problems of large fluctuations in precision cutting dimensions due to external interference, glass breakage caused by differences in glass placement and incoming material dimensions, and unstable marking starting positions affecting cutting quality, thus ensuring stable cutting dimensions and processing quality.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for improving the precision of liquid crystal substrate glass cutting, comprising a support and positioning component, a vision measurement component, and a central control component. The support and positioning component is disposed at the cutting station of the liquid crystal substrate glass cold end precision cutting production line and is used to support and fix the liquid crystal substrate glass to be cut without stress. The vision measurement component is synchronously and linkedly disposed on the scribing and cutting mechanism of the precision cutting production line for real-time acquisition of the scribing start edge position and pre-cutting line position images of the liquid crystal substrate glass. The central control component is electrically connected to the support and positioning component, the vision measurement component, and the scribing and cutting mechanism respectively, and is used to receive the actual glass image data transmitted by the vision measurement component, perform deviation correction calculation, and control the start and stop of the support and positioning component and the cutting position compensation of the scribing and cutting mechanism according to the calculation results.

[0008] Furthermore, the support positioning component includes a support platform with two rows of evenly distributed vacuum adsorption holes along the glass conveying direction on the edge of the support platform. The vacuum adsorption holes are connected to the main vacuum pipeline through a vacuum pipeline and a controllable solenoid valve, and the solenoid valve is controlled by a central control component.

[0009] Furthermore, the vacuum adsorption pores are circular through holes with a single hole diameter of φ1.0-φ1.5mm and a hole spacing of 12-18mm; the working negative pressure range of the vacuum adsorption pores is -85kPa to -95kPa.

[0010] Furthermore, the visual measurement component uses a camera, which is fixedly installed on one side of the blade holder of the scribing and cutting mechanism. The camera moves synchronously with the cutting head, and the horizontal distance between the center of the camera lens and the cutting head is a set value. The central axis in the Y direction coincides with the cutting head, and its visual acquisition range is not less than 2mm. The camera is controlled by the central control component.

[0011] Furthermore, the camera display screen is marked with the Y-axis and X-axis of the camera display screen, and the camera's acquisition reference is the zero point of the Y-axis or the zero point of the X-axis of the camera display screen.

[0012] Furthermore, the horizontal distance between the center of the camera lens and the cutting head is 100mm.

[0013] Furthermore, the central control component includes a PLC control module and a PLC data processing module. The PLC data processing module has a built-in image analysis and position calculation program to receive data collected by the vision measurement component and calculate the actual processing coordinates. The PLC control module outputs control commands based on the actual processing coordinates to adjust the movement position of the scribing and cutting mechanism, thereby achieving real-time correction of the cutting position.

[0014] Furthermore, the PLC control module is an industrial-grade programmable logic controller, and the PLC data processing module is a high-speed computing processing module.

[0015] Furthermore, the PLC data processing module uses a coordinate difference correction algorithm to calculate the actual machining coordinates. The specific calculation formula is as follows: Actual machining coordinates = preset standard coordinates + position deviation value Δ The position deviation value Δ is the difference between the actual coordinates acquired by the visual measurement component and the preset standard coordinates. It has positive and negative directions to represent the offset direction, and the positive direction is defined as the direction of increase along the coordinate axis.

[0016] The present invention also provides a method for precision cutting of the cold end of a liquid crystal substrate glass, which is carried out using the above-mentioned precision cutting device for liquid crystal substrate glass, and the specific steps are as follows: The central control unit acquires the relative position and standard cutting coordinates between the vision measurement unit and the cutting head of the scribing and cutting mechanism; The liquid crystal substrate glass to be calibrated is loaded onto the support and positioning assembly and fixed. The scribing and cutting mechanism drives the vision measurement component to move, collects the position data of the starting edge of the scribing on the glass, and performs pre-cutting at the starting edge of the scribing on the glass; The scribing and cutting mechanism drives the vision measurement component to move, collects the position data of the pre-cutting line, and transmits it to the central control component; The central control unit obtains the actual processing coordinates based on the position data of the pre-cutting line and the standard cutting coordinates, and controls the scribing and cutting mechanism to complete the processing according to the actual processing coordinates.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention provides a device for improving the precision of liquid crystal substrate glass cutting. By defining the core structure and connection relationship of the support positioning component, the vision measurement component, and the central control component, it adopts stress-free adsorption fixation to replace traditional mechanical rigid positioning, thus avoiding defects such as breakage, scratches, and deformation of the glass due to clamping and impact throughout the process. Relying on the vision measurement component to collect the actual position data of the glass in real time, and with the closed-loop correction of the central control component, it can achieve accurate compensation of the scribing start position and the cutting line position without additional mechanical positioning process. This improves the overall precision of liquid crystal substrate glass cutting, reduces glass loss and scrap rate, improves the quality of finished glass and the utilization rate of raw materials, and simplifies the processing flow, reducing the difficulty of controlling the quality and size of the precision scribing.

[0018] Furthermore, by arranging double rows of vacuum adsorption holes along the edge of the support platform, and using vacuum pipelines and controllable solenoid valves to achieve negative pressure adsorption and fixation, the outer adsorption area is specifically designed to fit the glass edge, while the inner support platform stably supports the glass body. This ensures uniform force distribution and stress-free operation, significantly improving the stability of the glass during cutting and eliminating displacement and warping issues. Simultaneously, the adsorption action is controllable, and with the central control component, precise timing regulation is achieved, adapting to continuous batch production and further ensuring cutting accuracy and glass integrity. By optimizing the structural parameters and working negative pressure parameters of the vacuum adsorption holes, and with a reasonable hole diameter and spacing design, sufficient adsorption force is ensured for stable glass fixation without causing localized deformation or cracking due to excessive adsorption force. A stable working negative pressure range of -85kPa to -95kPa is defined, achieving a safe adsorption force factor and stress-free flexible fixation, balancing fixation stability and glass integrity. This avoids glass breakage caused by improper adsorption parameters and further reduces processing losses.

[0019] Furthermore, the visual measurement component of this invention synchronously links the camera and the cutting head, ensuring a high degree of matching between the acquisition and cutting positions. With a visual acquisition range ≥2mm, it can clearly capture the actual edge of the glass and the outline of the cutting line, accurately capturing micron-level positional deviations. This effectively improves the stability and consistency of the scribing starting position, solving the scribing offset problem caused by glass placement deviations and material size fluctuations in traditional processing. It further reduces the difficulty of size control and ensures scribing and cutting accuracy. By defining the reference marking structure of the camera display screen and using the zero points of the X and Y axes of the display screen as the acquisition reference, it achieves quantitative judgment of glass positional deviation, facilitating on-site debugging, calibration, and data observation. This makes the measurement and calculation of the actual glass position more intuitive and accurate, providing a clear reference for the PLC data processing module, further improving the calculation accuracy of the scribing starting edge position and the cutting line position, and ensuring the accuracy of the correction data. The horizontal distance between the camera and the cutting head is further limited to 100mm. This setting is suitable for the conventional working conditions of cold-end precision cutting of LCD substrate glass. It ensures that the camera has a sufficient field of view, avoids acquisition errors caused by excessive distance, and facilitates equipment modification, installation and debugging. It does not require large-scale modification of the original scribing and cutting mechanism, reduces the cost of device modification, ensures the synchronization of data acquisition and cutting action, and further improves the correction accuracy.

[0020] Furthermore, this invention utilizes a PLC control module to coordinate overall action control, while a dedicated PLC data processing module performs specialized calculations. With clear division of labor and rapid response, it can quickly analyze image data, calculate positional deviations, and output correction instructions. This achieves precise simulation of the actual glass position and real-time compensation for the scribing position, providing accurate calculated values ​​for the scribing starting point and adapting to dynamic measurements of the actual glass placement position. This dual guarantee ensures the accuracy of the scribing and cutting position, improving processing efficiency and product consistency. The industrial-grade PLC control module is suitable for 24-hour continuous production in workshops, exhibiting strong anti-interference capabilities and stable operation. The high-speed processing module enables micron-level rapid calculations with low data processing latency, ensuring the real-time nature of measurement and correction actions. It meets the high-precision, high-cycle production requirements of LCD substrate glass, providing hardware support for improved processing accuracy and ensuring long-term stable operation of the device.

[0021] The PLC data processing module 12 adopts a coordinate difference correction algorithm, which achieves accurate compensation by using the difference between the preset standard coordinates and the actual collected coordinates. The deviation value has positive and negative directions to clearly distinguish the offset direction. The calculation logic is rigorous and the accuracy is ≤1μm. It can be adapted to the real-time position correction of a single glass sheet, and can also generate batch fixed correction parameters in pre-cutting mode. It effectively eliminates the processing and assembly errors caused by equipment downtime maintenance, replacement of cutter wheels / tool ​​holders, etc., ensures the stability of the cutting size of batch products, reduces scrap due to dimensional deviation, and improves the glass utilization rate.

[0022] When performing cold-end precision cutting of LCD substrate glass, this invention relies on an LCD substrate glass precision cutting accuracy improvement device to achieve closed-loop control of pre-cutting calibration and routine production. Before mass production, the actual position of the cutting line is collected through pre-cutting to complete batch correction parameter calibration. During routine production, real-time measurement and compensation are performed, and measurement and correction are completed online throughout the entire process. There is no need for pre-mechanical positioning, which completely avoids the risk of glass breakage caused by mechanical positioning. At the same time, it can dynamically adapt to changes in glass size and conveying position, providing comprehensive and accurate data support for cutting processing, ensuring the consistency between the scribing position and the product cutting size, greatly improving the efficiency of glass manufacturing and correction, and further improving the overall quality, dimensional stability and raw material utilization of LCD substrate glass. Attached Figure Description

[0023] Figure 1 Plan view of the online camera measurement mechanism for LCD substrate glass; Figure 2 An enlarged view of the edge position captured by the camera on the LCD substrate glass; Figure 3 A display diagram showing the edge of a camera capturing data onto a liquid crystal substrate glass substrate. Figure 4 A schematic diagram of the pre-cutting and scribing of a liquid crystal substrate glass. Figure 5A magnified view of the position of the precision cutting line captured by the camera on the LCD substrate glass; Figure 6 A display diagram showing the precise cutting position captured by the camera on the LCD substrate glass; In the attached diagram: 1. Support platform; 2. Vacuum adsorption hole; 3. LCD substrate glass; 4. Camera; 5. Scribing and cutting mechanism; 6. PLC control module; 7. Main vacuum pipeline; 8. Solenoid valve; 9. Vacuum pipeline; 10. Camera display screen; 11. Camera display screen Y-axis; 12. PLC data processing module; 13. Scribing starting edge; 14. Pre-cutting line; 15. Camera display screen X-axis. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] This embodiment addresses the precision cutting process of liquid crystal substrate glass 3 at the cold end, providing a device and method for improving the precision cutting accuracy of liquid crystal substrate glass. It aims to solve the technical problems of glass breakage and excessive dimensional fluctuations caused by traditional mechanical positioning. The device is directly compatible with existing liquid crystal substrate glass 3 precision cutting production lines, requiring no large-scale modifications to the original conveying mechanism and cutting host. It is compatible with continuous production of conventional and high-precision substrate glass, and the downstream dimensional control tolerance meets the industry standard requirement of ±200μm. The following detailed explanation of this technical solution is provided in conjunction with the device structure, workflow, and specific quantitative implementation examples.

[0026] like Figure 1 As shown, this embodiment provides a device for improving the precision of liquid crystal substrate glass cutting, including: a support and positioning component, a vision measurement component, and a central control component. The entire device is assembled in conjunction with the existing scribing and cutting mechanism 5, and the components work together to complete glass fixing, position detection, data calculation, and cutting correction actions. Wherein: The support and positioning assembly includes a support platform 1, which is divided into a central rigid support part and an edge vacuum adsorption part. The edge of the central rigid support part is provided with two rows of evenly distributed vacuum adsorption holes 2 along the glass conveying direction. The vacuum adsorption holes 2 are connected to the main vacuum pipeline 7 through a vacuum pipeline 9 and a controllable solenoid valve 8. The solenoid valve 8 is controlled by the central control assembly. The liquid crystal substrate glass 3 is fixed without stress through vacuum adsorption, so as to avoid glass displacement and warping during the cutting process. The visual measurement component uses camera 4, which is fixedly mounted on one side of the blade holder of the scribing and cutting mechanism 5. Camera 4 can move synchronously with the cutting head. The horizontal distance between the center of the camera lens and the cutting head is set to 100mm, and the Y-axis centerline coincides with the cutting head. Its visual acquisition range is not less than 2mm, which can clearly grasp the liquid crystal substrate glass 3, such as... Figure 1The edge contour and cutting line trajectory shown are captured by camera 4, showing the magnified position of the actual object at the edge of the glass. Figure 2 As shown, the corresponding edge acquisition display interface is as follows: Figure 3 As shown; the signal output terminal of camera 4 is connected to the central control component to transmit the collected image position data in real time. Camera 4 is also connected to camera display screen 10. Camera display screen 10 is marked with camera display screen Y axis 11 and camera display screen X axis 15 to facilitate on-site debugging and data observation. The central control component includes a PLC control module 6 and a PLC data processing module 12. The PLC data processing module 12 has a built-in image analysis and position calculation program, which is responsible for receiving data collected by the camera 4 and calculating the position deviation. The PLC control module 6 outputs control commands based on the calculation results to precisely adjust the moving position of the scribing and cutting mechanism 5 and realize real-time correction of the cutting position.

[0027] When starting the aforementioned precision-enhancing device for precision cutting of liquid crystal substrate glass, the process is divided into a regular production real-time correction process and a pre-cutting calibration process after equipment maintenance. After equipment maintenance shutdowns, cutting wheel replacements, tool holder disassembly and assembly, and scribing mechanism component replacements, a pre-cutting calibration process must be performed first to eliminate dimensional deviations caused by component processing and assembly errors. Only after successful calibration can the process proceed to the regular batch production process. During regular production, each piece of liquid crystal substrate glass 3 undergoes single-time real-time correction upon entering the cutting station to accommodate minor deviations in the placement position and incoming dimensions of the single piece of glass. No mechanical clamping or stop block limiting operations are required throughout the process. The specific process is as follows: Step 1: Complete the device initialization and debugging, and input the relative position parameters of the camera 4 and the cutter head, the preset standard coordinates, the dimensional tolerance threshold and other parameters into the PLC control module 6; Step 2: Perform pre-cutting calibration. Load the liquid crystal substrate glass 3 to be calibrated onto the support stage 1, activate vacuum adsorption for fixation, and use the scribing and cutting mechanism 5 to drive the camera 4 to first collect data on the position of the starting edge 13 of the scribing on the glass. Figure 4 As shown, after initial positioning is completed, pre-cutting is performed. Then, the position of the pre-cutting line 14 is captured by camera 4. The magnified position of the captured cutting line is shown in the image. Figure 5 As shown, the corresponding display interface is as follows: Figure 6 As shown; the PLC data processing module 12 receives the image pixel coordinate signal transmitted by the camera 4, converts the pixel deviation into the actual physical size deviation, obtains and fixes the correction parameters and stores them in the PLC control module 6, and the pre-cut glass is treated as waste. Step 3: During regular production, after the LCD substrate glass 3 is loaded and vacuum adsorption is completed, the camera 4 moves with the tool holder to the acquisition position to quickly acquire the actual position of the glass edge. The PLC data processing module 12 calculates the deviation value, and the PLC control module 6 adjusts the cutting coordinates of the cutting head according to the deviation value to complete the precise scribing and cutting. After the cutting is completed, the vacuum adsorption is released, and the glass is transported to the next process. This cycle is repeated to complete batch processing.

[0028] Preferably, the camera 4 has a resolution of no less than 12 megapixels, a high-speed wired data transmission interface, a frame rate of ≥30fps, a fixed-focus industrial lens suitable for close-range macro photography, image acquisition accuracy capable of identifying micron-level dimensional deviations, a response time of ≤50ms, and is suitable for working in a cleanroom environment with normal temperature. The image pixel to actual physical size calibration ratio is 1 pixel to 0.5μm, the acquisition focus height is fixed, and it is suitable for liquid crystal substrate glass 3 with a thickness range of 0.3mm-1.1mm. The acquisition target is the edge contour and cutting line trajectory of the glass, and it can achieve clear imaging without the assistance of additional light sources.

[0029] Preferably, the vacuum adsorption hole 2 is a circular through hole with a single hole diameter of φ1.0-φ1.5mm. Two rows of holes are arranged along the edge of the support platform 1, with a hole spacing of 12-18mm. The adsorption hole distribution area covers the glass edge support position. The vacuum pipeline 9 and the main vacuum pipeline 7 are pressure-resistant and sealed pipelines, capable of withstanding negative pressure ranges from -10kPa to -100kPa. The solenoid valve 8 is a two-position five-way controllable solenoid valve with a response time ≤20ms, no delay in switching control, and a power-off pressure-maintaining backup function. The stable negative pressure range of the vacuum system is -85kPa to -95kPa, and the adsorption force safety factor is ≥0.6, enabling stress-free adsorption and fixation. The vacuum adsorption start-up pressure threshold is -80kPa. After adsorption stabilization, the pressure remains constant. Adsorption and locking are completed within 1s after loading. The adsorption state is maintained throughout the cutting process. Adsorption is released 0.5s before unloading to avoid glass scratches. It is suitable for static adsorption positioning of standard-sized LCD substrate glass 3, with no displacement or warping.

[0030] Preferably, the PLC control module 6 is an industrial-grade programmable logic controller, suitable for continuous production in workshops, with compliant electromagnetic interference resistance, multiple digital input / output interfaces, and can synchronously connect to the vision acquisition component, vacuum adsorption component, and scribing and cutting mechanism 5. Signal response delay is ≤15ms, and it supports parameter storage and power-off retention. Multiple sets of standard coordinates and tolerance thresholds can be preset, and its operational stability meets the requirements for 24-hour continuous operation. It features a dual-mode switching function for manual debugging and automatic operation. It can receive and execute micron-level deviation correction signals, controlling the positioning accuracy of the scribing and cutting mechanism 5 to ≤±1μm. The opening and closing timing of the vacuum adsorption solenoid valve 8 is precisely controllable, with a loading adsorption response time ≤1s and a unloading adsorption release delay time ≤0.5s. It can store pre-cutting correction parameters and reuse them in batches, with no delay in single parameter recall. It receives and executes cutting position adjustments synchronously with real-time data processing, adapting to both real-time correction of single sheets of glass and batch correction.

[0031] Preferably, the PLC data processing module 12 is a dedicated high-speed computing module that works in conjunction with the PLC control module 6. Data transmission is latency-free, and it features image pixel coordinate analysis, physical size conversion, and deviation value calculation functions with a calculation accuracy of ≤±1μm. It can determine the positive and negative directions of the deviation to distinguish the offset orientation, supports the fixed storage of calibration parameters, and can quickly analyze the position image signal transmitted by the camera 4. It is adaptable to micron-level size deviation calculations and has strong industrial-grade operational stability. The real-time calculation time for a single glass sheet is ≤0.2s, and the pre-cutting calibration deviation calculation time is ≤0.3s. It can independently complete X-axis and Y-axis deviation calculations without interference. The calculation results are directly transmitted to the PLC control module 6, and the deviation value Δ can be directly used for cutter head position compensation, fully adapting to ±200μm size tolerance control requirements.

[0032] Preferably, the PLC data processing module 12 uses a coordinate difference correction algorithm for calculation, and the specific calculation formula is as follows: Actual machining coordinates = preset standard coordinates + position deviation value Δ The position deviation value Δ is obtained by comparing the actual coordinates collected by camera 4 with the system's preset standard coordinates through the module's built-in program. The positive and negative directions are used to characterize the offset orientation.

[0033] Example 1 This example is for a typical continuous production process where the dimensional deviation of the LCD substrate glass 3 is required to be controlled within ±200μm. A standard-sized substrate glass with a thickness of 0.5mm is selected as the processing object. The device parameters are set as follows: the PLC control module 6 is preset to a Y-axis standard scribing starting edge 13 position of 500mm; the camera 4's acquisition reference is the zero point of the camera display screen's Y-axis 11; the corresponding acquisition and display interface is as follows. Figure 6As shown, the deviation judgment rule is set so that the deviation value is positive when the glass edge is to the left of the reference, and negative when it is to the right. During the processing, the robotic arm places the single LCD substrate glass 3 on the support platform 1. After the vacuum adsorption pressure stabilizes to the set value, the scribing and cutting mechanism 5 moves to a distance of 100mm from the horizontal position of the scribing line and pauses. The camera 4 captures the edge image of the glass perpendicular to the scribing trajectory and transmits the pixel coordinate data to the PLC data processing module 12. The PLC data processing module 12 determines that the glass placement position is 50μm to the left of the reference position, that is, the Y-direction position deviation ΔY = +50μm. Substituting into the formula, the actual cutting position is 500mm + 50μm = 500.05mm. The PLC control module 6 controls the scribing and cutting mechanism 5 to move precisely to this position to complete the scribing and cutting. After subsequent dimensional inspection, the dimensional deviation of the LCD substrate glass 3 is 12μm, which is far below the control threshold of ±200μm. Moreover, there is no mechanical clamping contact throughout the process, and the glass has no chipping, scratches, or breakage. The yield rate meets the standard.

[0034] Example 2 This example addresses the maintenance situation after the cutting wheel has been replaced. Due to the machining tolerances of the cutting wheel itself and the assembly and disassembly errors, the pre-cutting line 14 is prone to overall offset. Batch correction needs to be completed through pre-cutting calibration. The processing objects and dimensional tolerance requirements are the same as in Example 1. The device parameters are set as follows: the PLC control module 6 presets the standard pre-cutting line 14 position in the X direction to 800mm, the camera 4 collects data based on the zero point of the X-axis 15 of the camera display screen, and the deviation judgment rule is set to negative when the cutting line is below the reference and positive when it is above the reference. After the cutter wheel is replaced, a piece of LCD substrate glass 3 of the same specification is taken as a pre-cut calibration piece. After loading, it is fixed by adsorption through the vacuum adsorption hole 2. First, the starting edge 13 of the scribing is conventionally positioned, and then pre-cutting is performed. After cutting, the camera 4 moves to the position of the pre-cutting line 14 to collect images. The actual coordinates of the cutting line are transmitted to the PLC data processing module 12. The analysis shows that the pre-cutting line 14 is 80μm lower than the reference position, that is, the X-direction cutting line deviation ΔX=-80μm. Substituting into the formula, the fixed actual cutting position for batch production is 800mm-80μm=799.92mm. This correction value is stored in the PLC control module 6. All LCD substrate glass 3 processed in subsequent batches are calibrated for X-direction cutting position according to this fixed correction value. After continuous production of 500 pieces, sampling inspection shows that the product size deviation is controlled within ±15μm, with no dimensional deviations or glass breakage. The assembly error caused by the cutter wheel replacement is completely eliminated, and the production stability is significantly improved.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. Any modifications made to the technical solutions based on the technical concept proposed in this invention fall within the scope of protection of this invention.

Claims

1. A device for improving the precision of liquid crystal substrate glass cutting, characterized in that, The system includes a support positioning component, a vision measurement component, and a central control component. The support positioning component is located at the cutting station of the cold end precision cutting production line for liquid crystal substrate glass (3) and is used to support and fix the liquid crystal substrate glass to be cut without stress. The vision measurement component is synchronously linked to the scribing and cutting mechanism (5) of the precision cutting production line and is used to collect images of the scribing start edge (13) position and the pre-cutting line (14) position of the liquid crystal substrate glass (3) in real time. The central control component is electrically connected to the support positioning component, the vision measurement component, and the scribing and cutting mechanism (5) respectively. It is used to receive the actual glass image data transmitted by the vision measurement component, perform deviation correction calculation, and control the start and stop of the support positioning component and the cutting position compensation of the scribing and cutting mechanism (5) according to the calculation results.

2. The device for improving the precision of liquid crystal substrate glass cutting according to claim 1, characterized in that, The support and positioning component includes a support platform (1). Two rows of uniformly distributed vacuum adsorption holes (2) are arranged along the glass conveying direction on the edge of the support platform (1). The vacuum adsorption holes (2) are connected to the main vacuum pipeline (7) through a vacuum pipeline (9) and a controllable solenoid valve (8). The solenoid valve (8) is controlled by the central control component.

3. The device for improving the precision of liquid crystal substrate glass cutting according to claim 2, characterized in that, The vacuum adsorption hole (2) is a circular through hole with a single hole diameter of φ1.0-φ1.5mm and a hole spacing of 12-18mm; the working negative pressure range of the vacuum adsorption hole (2) is -85kPa~-95kPa.

4. The device for improving the precision of liquid crystal substrate glass cutting according to claim 1, characterized in that, The visual measurement component uses a camera (4). The camera (4) is fixedly installed on one side of the blade holder of the scribing and cutting mechanism (5). The camera (4) moves synchronously with the cutting head. The horizontal distance between the center of the camera (4) lens and the cutting head is a set value. The central axis of the Y direction coincides with the cutting head. Its visual acquisition range is not less than 2mm. The camera (4) is controlled by the central control component.

5. The device for improving the precision of liquid crystal substrate glass cutting according to claim 4, characterized in that, The camera display screen (10) of the camera (4) is marked with the Y-axis (11) and X-axis (15) of the camera display screen. The acquisition reference of the camera (4) is the zero point of the Y-axis (11) or the zero point of the X-axis (15) of the camera display screen.

6. The device for improving the precision of liquid crystal substrate glass cutting according to claim 4, characterized in that, The horizontal distance between the center of the camera (4) lens and the cutting head is 100mm.

7. The device for improving the precision of liquid crystal substrate glass cutting according to claim 1, characterized in that, The central control component includes a PLC control module (6) and a PLC data processing module (12). The PLC data processing module (12) has a built-in image analysis and position calculation program to receive data collected by the vision measurement component and calculate the actual processing coordinates. The PLC control module (6) outputs control commands according to the actual processing coordinates to adjust the moving position of the scribing and cutting mechanism (5) and realize real-time correction of the cutting position.

8. The device for improving the precision of liquid crystal substrate glass cutting according to claim 7, characterized in that, The PLC control module (6) is an industrial-grade programmable logic controller, and the PLC data processing module (12) is a high-speed computing processing module.

9. The device for improving the precision of liquid crystal substrate glass cutting according to claim 7, characterized in that, The PLC data processing module (12) uses a coordinate difference correction algorithm to calculate the actual machining coordinates. The specific calculation formula is as follows: Actual machining coordinates = preset standard coordinates + position deviation value Δ The position deviation value Δ is the difference between the actual coordinates acquired by the visual measurement component and the preset standard coordinates. It has positive and negative directions to represent the offset direction, and the positive direction is defined as the direction of increase along the coordinate axis.

10. A method for cold-end precision cutting of liquid crystal substrate glass, characterized in that, The precision improvement device for liquid crystal substrate glass cutting according to any one of claims 1 to 9 is used, and the specific steps are as follows: The central control unit acquires the relative position and standard cutting coordinates of the cutter head of the vision measurement unit and the scribing and cutting mechanism (5); The liquid crystal substrate glass (3) to be calibrated is loaded onto the support and positioning assembly and fixed; The scribing and cutting mechanism (5) drives the vision measurement component to move, collects the position data of the glass scribing starting edge (13), and performs pre-cutting at the glass scribing starting edge (13); The scribing and cutting mechanism (5) drives the vision measurement component to move, collects the position data of the pre-cutting line (14) and transmits it to the central control component; The central control component obtains the actual processing coordinates based on the position data of the pre-cutting line (14) and the standard cutting coordinates, and controls the scribing and cutting mechanism (5) to complete the processing based on the actual processing coordinates.

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