Precision Control Process for Polishing Dimensions of In-vehicle Crystal Products and On-line Measurement System

Abstract

The present invention relates to the technical field of crystal production. More specifically, it relates to a precise control process for grinding dimensions and an on-line measurement system of in-vehicle crystal products. Due to the crystal structure and physical properties of the in-vehicle crystal products themselves, the in-vehicle crystal products are a relatively fragile material. Therefore, a cutting area is established on the surface of the in-vehicle crystal products in advance, and the cutting area and the grinding area are accurately identified by using area division. By controlling the grinding method, the symmetrical grinding areas are correspondingly identified and matched along the central symmetry axis direction of the in-vehicle crystal products. The double-group polishing wheels are used to control the grinding of the symmetrically identified and matched grinding areas in terms of feed speed, running angle, and force control magnitude moving away from each other, thereby improving the fine operation of in-vehicle crystal grinding, reducing the damage rate of crystal cutting and grinding, and thus enhancing the passing rate of products at the factory.

Description

Technical Field

[0001] The present invention relates to the technical field of crystal production, and more specifically, it relates to a precise control process for the grinding size of in-vehicle crystal products and an on-line measurement system. Background Art

[0002] As a high-grade and delicate decorative material, crystal decoration is widely used in environments such as homes, offices, weddings, hotels, shopping malls, etc. Crystal has excellent transparency, gloss and reflection effects, so it is often used as a raw material for various decorative items such as artworks, ornaments, and lighting fixtures. Crystal decorations can not only add an artistic atmosphere to the space but also display unique light and shadow effects.

[0003] Due to its unique display of light and shadow effects, it is highly sought after by the general public. For example, in many high-end cars, the crystal gear lever made of crystal material can, on the one hand, reflect the uniqueness of the luxury of the car interior, and on the other hand, endow the car brand with a high-class and precious label.

[0004] The crystal gear lever is a combined product of crystal material and metal machinery. By assembling crystal ornaments on the metal machinery, the crystal gear lever is formed. The crystal material can be combined with the metal machinery. Usually, specific notches need to be buried on the crystal ornament to facilitate the assembly and fixation of the metal machinery. In addition, multiple inclined planes are polished on the surface of the crystal material to improve the refractive efficiency of the crystal surface. The setting of multiple inclined planes can further increase the holding feeling of the driver.

[0005] However, due to the crystal structure and physical properties of the crystal itself, crystal is a relatively fragile material and is extremely easy to break or be damaged under the influence of external impact, shock or high temperature. Therefore, during the crystal grinding process, the crystal material is often damaged. Summary of the Invention

[0006] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a precise control process for the grinding size of in-vehicle crystal products, which has the advantages of reducing the damage rate of crystal cutting and grinding and improving the qualified rate of products leaving the factory.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: A precise control process for the grinding size of in-vehicle crystal products includes the following steps:

[0008] S1: Establish a cutting area. Establish multiple independent cutting areas on the surface of the in-vehicle crystal product, and make a differential division within each of the cutting areas to divide the cutting area.

[0009] S2: Obtain and distinguish the cutting area. Take a camera photo of the surface of the in-vehicle crystal product through a camera module to obtain the information of the picture to be recognized, and perform image preprocessing on the information of the picture to be recognized.

[0010] S3: Preliminary cutting: sorting the identified cutting areas according to the acquired image information to be identified, and dividing the cutting areas by water jet cutting;

[0011] S4: Establishing a polishing path, according to the acquired image information to be identified, converting the cutting area into a polishing area and marking them in sequence, and sorting the polishing order according to the marked areas, so as to construct a polishing path;

[0012] S5: polishing control, correspondingly identifying and matching the symmetrical polishing areas along the central symmetry axis of the vehicle-mounted crystal product, and using the double set of polishing wheels to correspondingly identify and match the symmetrical polishing areas to perform polishing control of feed speed, running angle, force control size and moving away from each other;

[0013] S6: Dimensional accuracy confirmation: the polished vehicle crystal product is scanned at multiple angles by using a structured light scanner, and the collected point cloud is converted into a point cloud format to obtain point cloud data in a universal format. The point cloud data is compared with the constructed original model in size, and a polishing dimension error threshold is set. For vehicle crystal products that are larger than the polishing dimension error threshold and are too large in size, restart the S5 step and polish again. For vehicle crystal products that are larger than the polishing dimension error threshold and are too small in size, the product is directly judged as unqualified.

[0014] Preferably, an infrared grid is projected on the surface of the vehicle-mounted crystal product, and the mapping coverage of the infrared grid on the surface of the vehicle-mounted crystal product is completed by adjusting the distance of the vehicle-mounted crystal product. Based on the division of the infrared grid, a cutting area is established on the surface of the vehicle-mounted crystal product.

[0015] Preferably, the surface of the vehicle-mounted crystal product is covered with oil-printed grid lines, and a cutting area is established on the surface of the vehicle-mounted crystal product based on the division of the oil-printed grid lines.

[0016] Preferably, based on the establishment of the cutting area of ​​the infrared grid, the surface of the vehicle-mounted crystal product is photographed by a camera module to obtain the image information to be identified, and the edge of the surface of the vehicle-mounted crystal product is first extracted by edge detection. After the identification frame of the vehicle-mounted crystal product, the image information to be identified is cropped around the vehicle-mounted crystal product in a fixed area, and then normalization, denoising, and color space conversion operations are performed in sequence.

[0017] Preferably, after preprocessing the image, different cutting areas are digitally marked, and then the order of the cutting areas is determined by sorting the marked numbers in order.

[0018] Preferably, for the in-vehicle crystal product calibrated based on the grinding size, the surface roughness needs to be detected. By setting the threshold value of the surface roughness of the in-vehicle crystal product, the detected surface roughness is compared with the set threshold value of the surface roughness of the in-vehicle crystal product. If the surface roughness of the in-vehicle crystal product is within the threshold range, it is determined that the quality of the in-vehicle crystal product is qualified; if the surface roughness of the in-vehicle crystal product is not within the threshold range, it is determined that the quality of the in-vehicle crystal product is unqualified.

[0019] Preferably, before detecting the surface roughness of the in-vehicle crystal product, after cleaning and drying operations in sequence, pictures of the product to be detected are obtained, and based on the cracks and convex-concave points on the surface of the in-vehicle crystal product, the roughness of the crystal surface is measured with the cracks and convex-concave points as weights.

[0020] Preferably, a roughness score is constructed by setting the weight coefficients W C and W P for the cracks and convex-concave points as weights. The scoring formula is: ;

[0021] where Nc is the total number of cracks, Np is the total number of convex-concave points, is the comprehensive roughness score.

[0022] In addition, the present application also provides an online measurement system, which includes applying the above-mentioned precise control process for the grinding size of an in-vehicle crystal product, and also includes an identification module, a cutting module, a grinding module, a control module, and a scanning module. The in-vehicle crystal product is pre-photographed by the identification module to obtain the information of the picture to be identified, the cutting area is analyzed and identified by using the obtained information of the picture to be identified, and then the cutting module drives the water jet to sequentially cut the identified cutting area. After the cutting is completed, the grinding module drives the double-group polishing wheels to grind the grinding area, and finally the scanning module confirms the grinding size of the in-vehicle crystal product after grinding.

[0023] In summary, the beneficial effects of the present invention are:

[0024] 1. Due to the crystal structure and physical properties of the in-vehicle crystal product itself, the in-vehicle crystal product is a relatively fragile material. Therefore, by establishing a cutting area, accurately identifying the cutting area and the grinding area through area division, and through the control of grinding, the symmetric grinding areas are correspondingly identified and matched along the central symmetry axis direction of the in-vehicle crystal product, and the double-group polishing wheels are used to control the grinding of the symmetric grinding areas corresponding to the identification and matching in terms of feed speed, running angle, and force control size moving away from each other, thereby improving the fine operation of in-vehicle crystal grinding and reducing the damage rate of crystal cutting and grinding;

[0025] 2. After the in-vehicle crystal product is polished, it is scanned from multiple angles using a structured light scanner, and the collected point cloud is converted into a point cloud data in a general format. The point cloud data is compared with the constructed original model in terms of size, and a polishing size error threshold is set to perform size qualification inspection on the polished in-vehicle crystal product, thereby improving the product passing rate at the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the shape and structure of the in-vehicle crystal product according to Embodiment 1 of the present invention;

[0027] Figure 2 is a schematic diagram of the production process flow according to Embodiment 1 of the present invention;

[0028] Figure 3 is a schematic diagram of the electrical connection structure of the online measurement system according to Embodiment 2 of the present invention.

[0029] Reference numerals: 1, in-vehicle crystal product; 2, control module; 21, identification module; 22, cutting module; 23, polishing module; 24, scanning module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component.

[0032] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] Example 1: A process for precisely controlling the grinding size of a vehicle-mounted crystal product, see Figure 1 and Figure 2 , including the following steps:

[0035] S1: Establish cutting areas, establish multiple independent cutting areas on the surface of the vehicle-mounted crystal product 1, and distinguish and divide each cutting area, thereby dividing the cutting area;

[0036] S2: obtaining the distinguished cutting area, photographing the surface of the vehicle-mounted crystal product 1 through a camera module to obtain the image information to be identified, and performing image preprocessing on the image information to be identified;

[0037] S3: Preliminary cutting: sorting the identified cutting areas according to the acquired image information to be identified, and dividing the cutting areas by water jet cutting;

[0038] S4: Establishing a polishing path, according to the acquired image information to be identified, converting the cutting area into a polishing area and marking them in sequence, and sorting the polishing order according to the marked areas, so as to construct a polishing path;

[0039] S5: polishing control, correspondingly identifying and matching the symmetrical polishing areas along the central symmetry axis of the vehicle-mounted crystal product 1, and using the double set of polishing wheels to correspondingly identify and match the symmetrical polishing areas to perform polishing control of the feed speed, running angle, and force control size moving away from each other;

[0040] S6: Dimension accuracy confirmation: the polished vehicle crystal product 1 is scanned at multiple angles by using a structured light scanner, and the collected point cloud is converted into a point cloud format to obtain point cloud data in a universal format. The point cloud data is compared with the constructed original model in size, and a polishing dimension error threshold is set. For vehicle crystal products 1 that are larger than the polishing dimension error threshold and are too large in size, the S5 step is restarted for further polishing. For vehicle crystal products 1 that are larger than the polishing dimension error threshold and are too small in size, the product is directly judged as unqualified.

[0041] When this embodiment is implemented, due to the crystal structure and physical properties of the in-vehicle crystal product 1 itself, the in-vehicle crystal product 1 is a relatively fragile material. Therefore, by establishing a cutting area, accurately identifying the cutting area and the grinding area through area division, and through the control of grinding, the symmetrical grinding areas are correspondingly identified and matched along the central symmetry axis direction of the in-vehicle crystal product 1, and the grinding control of the symmetrical grinding areas corresponding to the identification and matching by the double-group polishing wheels is carried out with the feed speed, running angle, and force control size moving away from each other, thereby improving the fine operation of in-vehicle crystal grinding;

[0042] After the in-vehicle crystal product 1 is ground, it is scanned from multiple angles by using a structured light scanner, and the collected point cloud is converted into point cloud data in a general format. The point cloud data is compared with the constructed original model in terms of size, and a grinding size error threshold is set to detect the size qualification of the ground in-vehicle crystal product 1, thereby improving the product passing rate at the factory.

[0043] For example, the standard size length of the crystal gear knob is 50.00 mm. According to the production process and actual situation, the error threshold can be set as follows:

[0044] Error threshold: ±0.2 mm, that is, the size range is from 49.80 mm to 50.20 mm.

[0045] Specific operation:

[0046] Oversize: If the scanned data shows that the size of the ground crystal gear knob is greater than 50.20 mm, the product is regarded as unqualified and needs to be reground.

[0047] Undersize: If the scanned data shows that the size of the ground crystal gear knob is less than 49.80 mm, the product is directly determined to be unqualified and no further correction is made.

[0048] Size within the error range: If the scanned data shows that the size of the ground crystal gear knob is between 49.80 mm and 50.20 mm, it means that the product meets the standard and no further adjustment is required.

[0049] Illustrative example:

[0050] 1. Meeting the standard:

[0051] Scanned data: 50.05 mm

[0052] Result: The size is within the range of ±0.2 mm, and it is determined to meet the standard.

[0053] 2. Oversize:

[0054] Scanned data: 50.35 mm

[0055] Result: The size exceeds the tolerance range (> 50.20 mm), and it needs to be polished again.

[0056] 3. Smaller:

[0057] Scanned data: 49.60 mm

[0058] Result: The size is below the tolerance range (< 49.80 mm), and it is determined as unqualified.

[0059] Before completing cutting and polishing, the first step is to divide the area on the surface of the in-vehicle crystal product 1. In this embodiment, an infrared grid is projected on the surface of the in-vehicle crystal product 1. By adjusting the distance of the in-vehicle crystal product 1, the mapping coverage of the infrared grid on the surface of the in-vehicle crystal product 1 is completed. Based on the division of the infrared grid, a cutting area is established on the surface of the in-vehicle crystal product 1.

[0060] The infrared grid projection of this embodiment is implemented based on structured light scanning. Refer to Figure 1 Based on the division of the infrared grid, a cutting area is established on the surface of the in-vehicle crystal product 1, and the surface of the in-vehicle crystal product 1 is photographed by the camera module to obtain the information of the picture to be recognized.

[0061] Or an oil printing grid line is covered on the surface of the in-vehicle crystal product 1, and based on the division of the oil printing grid line, a cutting area is established on the surface of the in-vehicle crystal product 1.

[0062] To obtain the information of the picture to be recognized, first extract the edge of the surface of the in-vehicle crystal product 1 through edge detection. After the recognition frame of the in-vehicle crystal product 1 is determined, the information of the picture to be recognized is cropped in a fixed area around the in-vehicle crystal product 1, and then operations such as normalization, denoising, and color space conversion are performed in sequence to complete the preprocessing operation of the image.

[0063] After that, cutting is carried out. First, different cutting areas are numerically marked, and then the marked numbers are sorted before and after to determine the order of the cutting areas;

[0064] After cutting, polishing is carried out. The cutting areas are converted into polishing areas and marked in sequence, and the polishing order is sorted according to the marked areas to construct a polishing path to complete the polishing of the in-vehicle crystal product 1.

[0065] After polishing is completed, the in-vehicle crystal product 1 is first passed through cleaning and drying operations, and then the camera module is used to obtain pictures of the product to be detected to avoid the influence of impurities from polishing or cutting on the detection result of the surface roughness of the in-vehicle crystal product 1.

[0066] For the detection of the surface roughness of in-vehicle crystal product 1, in this embodiment, by setting the threshold value of the surface roughness of in-vehicle crystal product 1, the detected surface roughness is compared with the set threshold value of the surface roughness of in-vehicle crystal product 1. If the surface roughness of in-vehicle crystal product 1 is within the threshold range, it is determined that the quality of in-vehicle crystal product 1 is qualified; for the surface roughness of in-vehicle crystal product 1 that is not within the threshold range, it is determined that the quality of in-vehicle crystal product 1 is unqualified.

[0067] By constructing a roughness score, by setting the weight coefficients W of cracks and uneven points as weights C and W P , the scoring formula is: ;

[0068] where Nc is the total number of cracks, Np is the total number of uneven points, is the comprehensive roughness score.

[0069] In constructing the roughness calculation model, set the weights and influencing factors to construct a comprehensive roughness scoring system. For example

[0070] Crack influence factor Ci:

[0071] Ci =

[0072] Li: the length of the i-th crack; Di: the depth of the i-th crack; A: the total area of the measurement region

[0073] Uneven point influence factor Pj:

[0074] Ci =

[0075] hj: the height of the j-th uneven point (positive value for protrusion, negative value for depression); Aj: the influence area of the j-th uneven point; A: the total area of the measurement region.

[0076] Assume that the measurement region A = 100 mm 2 , and there are the following defects in this region:

[0077] Cracks:

[0078] The 1st crack: length L1 = 5 mm, depth D1 = 0.1 mm;

[0079] The 2nd crack: length L2 = 3 mm, depth D2 = 0.05 mm;

[0080] Calculate the crack influence factor:

[0081] C1 = L1 * D1 / A = 5 * 0.1 / 100 = 0.005; C2 = L2 * D2 / A = 3 * 0.05 / 100 = 0.0015

[0082] Convex and concave points:

[0083] The first convex point: height h1 = 0.2 mm, affected area A1 = 1 mm 2 .

[0084] The second concave point: height h2 = -0.15 mm, affected area A2 = 0.8 mm 2 .

[0085] Calculate the influence factor of convex and concave points:

[0086] P1 = h1 * A1 / A = 0.2 * 1 / 100 = 0.002.

[0087] P2 = h2 * A2 / A = -0.15 * 0.8 / 100 = -0.0012.

[0088] Assume the weight W of the crack c = 1, and the weight W of the convex and concave points p = 0.5, then the roughness score is:

[0089] R = W c *(C1 + C2)+W p *(P1 + P2);

[0090] R = 1 * (0.005 + 0.0015)+0.5 * (0.002 - 0.0012);

[0091] R = 0.0065 + 0.0004 = 0.0069.

[0092] In this way, the obtained roughness score R = 0.0069 can be used to compare the roughness between the surfaces of different in-vehicle crystal products 1. The larger the roughness score value, the more obvious the surface roughness and the less smooth the surface.

[0093] By setting the weights of the cracks and convex and concave points on the surface of in-vehicle crystal product 1 and calculating the surface roughness by combining these factors, the overall quality of the crystal surface can be evaluated more comprehensively.

[0094] Example 2: Based on the application of a precise control process for the grinding size of an in-vehicle crystal product, see Figure 3, the difference between this embodiment and the first embodiment is as follows: An on-line measurement system is provided, which includes an identification module 21, a cutting module 22, a grinding module 23, a control module 2, and a scanning module 24. The identification module 21 pre-shoots the in-vehicle crystal product 1 to obtain the information of the picture to be identified, analyzes and identifies the cutting area by using the obtained information of the picture to be identified, and then drives the water jet by the cutting module 22 to sequentially cut the identified cutting area. After the cutting is completed, the grinding module 23 drives the double-group polishing wheels to grind the grinding area, and finally the scanning module 24 confirms the grinding size of the in-vehicle crystal product 1 after grinding.

[0095] Due to the strict requirements for the quality and size of the in-vehicle crystal product 1, the on-line measurement of its size will be realized.

[0096] The identification module 21 is responsible for processing the image of the object to be processed, and extracting information such as the target area, cutting path, and surface features. The output of the identification module 21 is a clear cutting area coordinate and the corresponding cutting path data. These data will be transmitted to the cutting module 22 through the data bus or communication protocol.

[0097] Transmission of the recognition result and the cutting path: The recognition module 21 will transmit the cutting area, path coordinates, and related processing parameters, such as cutting depth, angle and other processing parameters, to the cutting module 22, and the cutting module 22 drives the water jet to perform the preliminary cutting operation according to this information.

[0098] The grinding module 23 converts the cutting area marked by the identification module 21 into a grinding area. The identification module 21 will transmit the grinding area, path coordinates, and related processing parameters, such as feed speed, running angle, force control size and other processing parameters, to the grinding module 23, and the grinding module 23 drives the double-group polishing wheels to perform grinding control according to this information.

[0099] The control module 2, as the "brain" of the whole system, is responsible for coordinating the work of each module. It receives the status information from the identification module 21, the cutting module 22, the grinding module 23, etc., makes decisions and sends control signals. The control module 2 determines the working sequence, parameter adjustment and status synchronization of each module according to the preset logic.

[0100] The scanning module 24 is used to scan the surface shape and size of the processed in-vehicle crystal product. The output data of the scanning module 24 is the three-dimensional surface data of the current in-vehicle crystal product 1. By comparing with the three-dimensional surface data of the original model size, it is used to identify whether the size quality of the current in-vehicle crystal product 1 is qualified.

[0101] The rest of this embodiment is the same as that of the first embodiment. For the features not explained in this embodiment, the explanations of the first embodiment are adopted and will not be elaborated here.

[0102] The above embodiments are merely explanations of the present invention and are not limitations thereof. After reading this specification, those skilled in the art may make modifications to these embodiments that do not contribute creatively as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A process for precisely controlling the grinding size of a vehicle-mounted crystal product, characterized by: The following steps are involved: S1: Establish cutting areas, establish multiple independent cutting areas on the surface of the vehicle-mounted crystal product, and make distinctions in each cutting area to divide the cutting areas; S2: Obtain the distinguished cutting area, take a picture of the surface of the vehicle-mounted crystal product through a camera module to obtain the image information to be identified, and perform image preprocessing on the image information to be identified; S3: Preliminary cutting: sorting the identified cutting areas according to the acquired image information to be identified, and dividing the cutting areas by water jet cutting; S4: Establishing a polishing path, according to the acquired image information to be identified, converting the cutting area into a polishing area and marking them in sequence, and sorting the polishing order according to the marked areas, so as to construct a polishing path; S5: polishing control, correspondingly identifying and matching the symmetrical polishing areas along the central symmetry axis of the vehicle-mounted crystal product, and using the double set of polishing wheels to correspondingly identify and match the symmetrical polishing areas to perform polishing control of feed speed, running angle, force control size and moving away from each other; S6: Dimensional accuracy confirmation: the polished vehicle crystal product is scanned at multiple angles by using a structured light scanner, and the collected point cloud is converted into a point cloud format to obtain point cloud data in a universal format. The point cloud data is compared with the constructed original model in size, and a polishing dimension error threshold is set. For vehicle crystal products that are larger than the polishing dimension error threshold and are too large in size, restart the S5 step and polish again. For vehicle crystal products that are larger than the polishing dimension error threshold and are too small in size, the product is directly judged as unqualified.

2. According to the process for accurately controlling the grinding size of a vehicle-mounted crystal product according to claim 1, it is characterized by: An infrared grid is projected on the surface of the car crystal product. By adjusting the distance of the car crystal product, the infrared grid is mapped and covered on the surface of the car crystal product. Based on the division of the infrared grid, a cutting area is established on the surface of the car crystal product.

3. According to claim 1, a process for precisely controlling the grinding size of a vehicle-mounted crystal product is characterized by: Use oil printing to cover the oil printing grid lines on the surface of the car crystal product, and establish a cutting area on the surface of the car crystal product based on the division of the oil printing grid lines.

4. According to claim 2, a process for precisely controlling the grinding size of a vehicle-mounted crystal product is characterized by: Based on the establishment of the cutting area by the infrared grid, the surface of the car crystal product is photographed by the camera module to obtain the image information to be identified. The edge of the surface of the car crystal product is first extracted by edge detection. After the identification frame of the car crystal product, the image information to be identified is cropped around the car crystal product in a fixed area, and then normalization, denoising, and color space conversion operations are performed in sequence.

5. According to claim 4, a process for precisely controlling the grinding size of a vehicle-mounted crystal product is characterized by: After preprocessing the image, different cutting areas are digitally marked, and then the order of the cutting areas is determined by sorting the marked numbers in order.

6. The process for precisely controlling the grinding size of a vehicle-mounted crystal product according to claim 1 is characterized by: The surface roughness of the vehicle-mounted crystal product after the grinding size calibration needs to be tested. By setting the threshold of the surface roughness of the vehicle-mounted crystal product, the tested surface roughness is compared with the set threshold of the surface roughness of the vehicle-mounted crystal product. If the surface roughness of the vehicle-mounted crystal product is within the threshold range, the quality of the vehicle-mounted crystal product will be judged to be qualified. If the surface roughness of the vehicle-mounted crystal product is not within the threshold range, the quality of the vehicle-mounted crystal product will be judged to be unqualified.

7. The process for precisely controlling the grinding size of a vehicle-mounted crystal product according to claim 6 is characterized by: Before testing the surface roughness of the car crystal product, the product is cleaned and dried in sequence, and then a picture of the product to be tested is obtained. Based on the cracks and convex and concave points on the surface of the car crystal product, the roughness of the crystal surface is calculated using the cracks and convex and concave points as weights.

8. The process for precisely controlling the grinding size of a vehicle-mounted crystal product according to claim 7 is characterized by: Construct the roughness score by setting the cracks and convex and concave points as weight coefficients W C and W P , the scoring formula is: Where Nc is the total number of cracks, Np is the total number of convex and concave points, R is the comprehensive roughness score, Ci is the crack influence factor, and Pj is the convex and concave point influence factor.

9. An online measurement system, characterized in that: It includes an application of a precise control process for the polishing size of a vehicle-mounted crystal product as described in claim 1, and also includes an identification module, a cutting module, a polishing module, a control module and a scanning module. The identification module is used to pre-shoot the vehicle-mounted crystal product to obtain image information to be identified, and the acquired image information to be identified is used to analyze and identify the cutting area. The cutting module then drives the water jet to sequentially cut the identified cutting area. After the cutting is completed, the polishing module is used to drive the double sets of polishing wheels to polish the polishing area. Finally, the scanning module confirms the polishing size of the vehicle-mounted crystal product after polishing.

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