A processing method for reducing the bending deformation of a curved glass measuring jig

Abstract

The present disclosure provides a processing method for reducing the bending deformation of a curved glass measuring jig, comprising: taking a plate as a bottom plate of the measuring jig, and processing threaded holes on the plate; preparing several support blocks with different heights according to a first predetermined distance as a gradient, and processing mounting holes on the bottom of the support blocks according to the commonly used height of the jig; segmenting the jig design drawing according to a second predetermined distance as an interval, selecting a support block with the same height as the height of the highest point of each segment of the jig design drawing after segmentation as the support block of the segment, and mounting the selected several support blocks according to the order of the jig design drawing to the bottom plate and fixedly connecting the support blocks and the bottom plate through bolts; and coarsely processing and finely processing the combination of the support blocks and the bottom plate to obtain the measuring jig. The processing method greatly improves the deformation of the measuring jig after processing by using the combination of the multi-segment support blocks and the metal bottom plate subjected to heat treatment.

Description

Technical Field

[0001] This invention relates to the field of 3D curved glass technology, and in particular to a processing method for reducing the bending deformation of curved glass measuring fixtures. Background Technology

[0002] 3D curved glass covers are a material with excellent properties such as thinness, transparency, fingerprint resistance, and scratch resistance, and are widely used in high-end smartphones, tablets, and automotive displays. Currently, with the diversification of demands, there is an increasing need for ultra-large triple-screen displays, complex curved surfaces, and large flat screens that can be adjusted to different viewing angles. As the technology of 3D curved glass covers matures and stabilizes, and as people's requirements for product performance continue to increase, the market demands increasingly higher precision in the contours of 3D curved glass covers.

[0003] In the production process of irregularly shaped curved 3D glass covers, specialized measuring fixtures are required to place the glass and accurately measure its dimensions and external features. Therefore, the structure and precision of the measuring fixture significantly affect the accuracy of the measurements. During measurement, a 2D image measuring instrument and a 3D coordinate measuring machine are used to measure the line profile and surface profile of the irregularly shaped curved 3D glass cover. The design of the measuring fixture takes into account the outer contour and surface curvature of the glass cover to be measured. Theoretically, once the glass cover is placed on the measuring fixture, the line profile and surface profile of the cover glass will match the design. Figure 1 However, if the measuring fixture is not machined with high precision, the measured value of the cover glass will not match the actual value. Among the various factors affecting the precision of the measuring fixture, the stress deformation of the material itself is relatively uncontrollable. The larger the size of the measuring fixture and the larger the curvature of the cover glass, the more severe the deformation of the finished measuring fixture will be.

[0004] Therefore, existing technologies still need improvement. Summary of the Invention

[0005] One of the technical problems that this disclosure aims to solve is that the material of the curved glass measuring fixture is subject to stress deformation factors that are relatively uncontrollable. The larger the size of the measuring fixture and the larger the curvature of the cover glass, the more severe the deformation of the finished measuring fixture will be.

[0006] To address the aforementioned technical problems, this invention proposes a processing method for reducing the bending deformation of curved glass measuring fixtures.

[0007] On one hand, the processing method for reducing the bending deformation of curved glass measuring fixtures disclosed in the embodiments of the present invention includes the following steps: The sheet metal is used as the base plate of the measuring fixture, and threaded holes are machined on it; Based on the commonly used height of the fixture, several support blocks of different heights are prepared with a first predetermined distance as a gradient, and mounting holes are machined on the bottom of the support blocks; The jig design drawing is divided into segments at a second predetermined distance. Based on the height of the highest point of each segment of the jig design drawing, a support block with the same height is selected as the support block for this segment. Install the selected support blocks into the base plate in sequence according to the fixture design drawing, and fix the support blocks to the base plate with bolts. The assembly of the support block and the base plate is rough-machined and then fine-machined to obtain a measuring fixture; Use a 3D measuring instrument and a 2D measuring instrument to measure whether the machined measuring fixture meets the surface and line contour dimensional requirements of the fixture design drawing.

[0008] In some embodiments, the base plate is a square metal plate of a predetermined thickness that has undergone heat treatment, and the bottom of the support block contacts the upper surface of the base plate, the upper surface of the base plate being frosted to enhance the friction with the bottom of the support block.

[0009] In some embodiments, the square metal plate is selected from a square metal plate or a rectangular metal plate; the square metal plate is made of aluminum.

[0010] In some embodiments, the support block is made of acrylic or bakelite.

[0011] In some embodiments, a plurality of support blocks are installed side by side on the base plate with no gap between them; the plurality of support blocks are not connected by adhesive bonding, but are detachably fixed to the base plate by bolts.

[0012] In some embodiments, the support block further includes measuring point holes for measuring curved glass using a measuring instrument, and the mounting holes of the support block are located at different positions than the measuring point holes.

[0013] In some embodiments, the fixture design drawing is made based on the concave surface of the curved glass to be measured, and the concave surface of the curved glass to be measured serves as the dimensional standard for the measuring fixture so that the glass and the fixture fit tightly together.

[0014] In some embodiments, the rough machining step of the assembly of the support block and the base plate is as follows: The rough blank of the combination of support block and base plate is machined to obtain the approximate shape of the measuring fixture. In this state, the surface of the measuring fixture is rough, and the size of the measuring fixture is slightly larger than the size of the fixture design drawing.

[0015] In some embodiments, after the rough machining step, the step of finishing the assembly of the support block and the base plate is as follows: Using a ball end mill on the rough-machined measuring fixture, the details of the measuring fixture are slowly machined out, and all the burrs produced by rough machining are removed. The finished measuring fixture has a smooth surface, and the dimensions of the measuring fixture match the dimensions of the fixture design drawing.

[0016] In some embodiments, when the combination of the support block and the base plate is processed, abutments protruding from the upper surface of the support block are machined in the width and length directions of the support block to fix the placement position of the curved glass during each measurement.

[0017] By adopting the above technical solution, the present invention has at least the following beneficial effects: This invention provides a processing method for reducing the bending deformation of curved glass measuring fixtures. In order to reduce the influence of stress deformation on the measurement results, this processing method uses a combination of multiple support blocks and a heat-treated metal base plate for fixing, which greatly improves the deformation of the measuring fixture after processing, thereby making the measurement data more accurate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the combination of a base plate and a single support block in a measuring fixture disclosed in an embodiment of the present invention; Figure 2 This is a schematic diagram of a measuring fixture disclosed in an embodiment of the present invention; Figure 3 for Figure 2 A side view of the measuring fixture before roughing and finishing; Figure 4 for Figure 2 A three-dimensional schematic diagram of the measuring fixture before roughing and finishing; Figure 5 This is a schematic diagram of the measuring fixture disclosed in another embodiment of the present invention before roughing and finishing. Figure 6 This is a schematic diagram of the structure of a conventional curved glass measuring fixture.

[0020] Explanation of reference numerals in the attached figures: 1. Base plate; 2. Support block; 3. Bolt; 4. Threaded hole; 5. Mounting hole; 6. Measuring point hole (existing technology); 7. Alignment (existing technology); 8. Measuring point hole; 9. Alignment. Detailed Implementation

[0021] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0022] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0023] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0025] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0026] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0028] Some embodiments of the present invention disclose a processing method for reducing the bending deformation of curved glass measuring fixtures. For example... Figure 1-5 The image shows a measuring fixture obtained using this processing method. Among them, Figure 1-4 A measuring fixture required for a curved glass surface that is high in the middle and low at both ends. Figure 5 This invention provides a measuring fixture for curved glass that is higher at one end and gradually decreases at the other. The processing method of this invention has a certain degree of versatility, and the arrangement of the support blocks 2 can be adjusted according to the shape of the curved glass.

[0029] Specifically, this processing method involves pre-dividing the material into multiple small modules for preparation, followed by natural aging treatment to reduce internal stress. Segmenting the large material further disperses internal stress, reducing stress on each small module and minimizing deformation. A heat-treated metal base plate 1 is used as a fixing point, and bolts 3 are used to secure multiple small material pieces to it. Small materials of varying heights are selected according to the design drawings to assemble the approximate shape of the measuring fixture. The assembled measuring fixture blank is then rough-machined and subsequently finished. Compared to existing processing methods, the finished measuring fixture exhibits better overall deformation due to the distributed stress across the small modules and the assistance of the metal base plate 1. Therefore, the processing method of this invention offers superior accuracy compared to existing methods.

[0030] For example, the process of manufacturing a C-shaped curved 3D glass cover involves steps such as sizing, CNC machining, hot bending, strengthening, screen printing, and AG. Hot bending, strengthening, and screen printing utilize curved surface measuring fixtures to determine if the product's line and surface contour dimensions meet the drawing requirements. The measuring fixture design typically uses the lowest point of the convex surface of the curved 3D glass cover as the Z-axis reference, with the maximum length and width offset to serve as the X and Y-axis references. The concave surface of the glass cover is used as the contour surface of the measuring fixture to ensure a tight fit between the glass and the fixture. To maintain the glass's placement during each measurement, a contour-following guide is designed on the fixture surface based on the glass's outer contour. Additionally, during processing, holes are drilled at the measurement points on the fixture to prevent the mounting holes of the support blocks from interfering with the identification of these measurement points.

[0031] The processing method for reducing the bending deformation of curved glass measuring fixtures according to embodiments of the present invention includes the following steps: The plate is used as the base plate 1 of the measuring fixture, and threaded holes 4 are machined on it; Based on the commonly used height of the fixture, several support blocks 2 of different heights are prepared in gradients with a first predetermined distance (e.g., 10mm). The bottom of the support block 2 is machined with mounting holes 5. Specifically, several acrylic materials are prepared in gradients based on the commonly used fixture height, such as 10mm, and the mounting holes 5 are obtained at corresponding positions according to the threaded hole 4 of the metal base plate 1. For example, the length of the acrylic material is 300mm, the width is 50mm, and the height is 50mm, 60mm, 70mm, 80mm, and 90mm.

[0032] The fixture design drawing is divided into segments at intervals of a second predetermined distance (e.g., 50mm) (the second predetermined distance can vary depending on the change of the threaded hole 4 of the metal base). According to the height of the highest point of each segment of the fixture design drawing, a support block 2 with the same height is selected as the support block 2 for this segment. Install the selected support blocks 2 onto the base plate 1 in sequence according to the fixture design drawing, and fix the support blocks 2 to the base plate 1 with bolts 3; align the mounting holes 5 of the support blocks 2 with the threaded holes 4 of the base plate 1, and insert the bolts 3 into them to achieve fixation. When using bolts 3 for fixation, a fixed torque must be applied, and thread-locking adhesive should be used to prevent the bolts 3 from loosening. The bolts 3 must not extend beyond the bottom surface of the base plate 1.

[0033] The assembly of support block 2 and base plate 1 is rough-machined and fine-machined to obtain a measuring fixture; Use a 3D measuring instrument and a 2D measuring instrument to measure whether the machined measuring fixture meets the surface and line contour dimensional requirements of the fixture design drawing.

[0034] In some embodiments, the base plate 1 is a square metal plate of a predetermined thickness (e.g., 30 mm) that has undergone heat treatment, and the bottom of the support block 2 contacts the upper surface of the base plate 1. The upper surface of the base plate 1 is frosted to enhance the friction with the bottom of the support block 2. The size of the metal base and the spacing of the threaded holes 4 are selected to meet the production needs of most measuring fixtures and to avoid conflicts in measuring points.

[0035] In some embodiments, the square metal plate is selected from a square metal plate or a rectangular metal plate; the square metal plate is made of aluminum.

[0036] In some embodiments, the support block 2 is made of acrylic or bakelite. The material of the support block 2 can be obtained by batch cutting from new raw materials or by cutting from scrap measuring jigs.

[0037] In some embodiments, a plurality of support blocks 2 are installed side by side on the base plate 1 with no gap between them; the plurality of support blocks 2 are not connected by adhesive bonding, but are detachably fixed to the base plate 1 by bolts 3.

[0038] In some embodiments, the support block 2 further includes a measuring point hole 8 for measuring curved glass using a measuring instrument. The position of the mounting hole 5 of the support block 2 is different from that of the measuring point hole 8. By comparing the fixture design drawing with the assembly, it is possible to avoid conflicts between the measuring point hole 8 of the cover glass and the mounting hole 5 of the bolt 3 of the support block 2, which would cause the measuring point hole 8 to be blocked by the bolt 3 and affect the acquisition of measurement data.

[0039] In some embodiments, the fixture design drawing is made from the concave surface of the curved glass to be measured, which serves as the dimensional standard for the measuring fixture, such as the contoured surface of the upper surface, so that the glass and the fixture fit together tightly.

[0040] In some embodiments, the rough machining step of the assembly of support block 2 and base plate 1 is as follows: The rough blank of the assembly of support block 2 and base plate 1 is machined to form the approximate shape of the measuring fixture. In this state, the surface of the measuring fixture is rough, and the size of the measuring fixture is slightly larger than the size of the fixture design drawing. Specifically, a large-diameter cutting tool is used to quickly machine the approximate shape of the fixture. In this state, the fixture has a rough surface and its size is slightly larger than the design drawing.

[0041] In some embodiments, after the rough machining step, the step of finishing the assembly of the support block 2 and the base plate 1 is as follows: Using a ball end mill on the rough-machined measuring fixture, the details of the measuring fixture are slowly machined out, and all the burrs produced by rough machining are removed. The finished measuring fixture has a smooth surface, and the dimensions of the measuring fixture match the dimensions of the fixture design drawing.

[0042] In some embodiments, when the assembly of the support block 2 and the base plate 1 is processed, abutments 9 protruding from the upper surface of the support block 2 are machined in the width and length directions of the support block 2 to fix the placement position of the curved glass during each measurement (e.g., Figure 2 (As shown).

[0043] In some embodiments, when programming for rough machining of the assembly, it is important to note that it is best to model the assembly as a blank before programming to prevent excessive roughing feed from causing a decrease in accuracy.

[0044] The processing method described in the above embodiment first cuts the raw material into several support blocks 2 according to the common height of the fixture. Then, according to the fixture design drawing, the support blocks 2 are fixed on the metal base, followed by secondary processing. This method reduces the possibility of deformation of the curved surface measuring fixture under stress after processing, increases the processing accuracy of the measuring fixture, and improves the accuracy of glass cover plate measurement. The raw materials can also be discarded or idle fixtures or scraps. This method effectively reduces the amount of raw materials used and the processing time when processing measuring fixtures for large-size, high-curvature cover glass.

[0045] In some embodiments, the curved glass measuring fixture of this invention consists of two parts. The bottom part is a rectangular aluminum plate, for example, 30 mm thick, that has undergone heat treatment. The aluminum plate has threaded holes 4, and its upper surface is frosted to enhance friction. The upper part is composed of multiple pieces of acrylic or bakelite material arranged side-by-side, without the need for bonding between the materials. It is connected to the metal base plate 1 by bolts 3 after being perforated.

[0046] Bakelite is a type of plastic material with high mechanical strength, good insulation, high temperature resistance, and corrosion resistance. Its chemical name is phenolic plastic, abbreviated as PF.

[0047] like Figure 1 As shown, this invention utilizes the characteristic of small-sized materials having small stress deformation. A heat-treated metal base plate 1 is used as a fixing point, and multiple small-sized support blocks 2 are fixed to the metal base plate 1 using bolts 3. Small-sized support blocks 2 of different heights are selected according to the design drawings to form the approximate shape of the fixture (e.g., ...). Figure 3-4 As shown), the assembly is then rough-machined and fine-machined to obtain a measuring fixture (such as...). Figure 2 (As shown). Due to the segmentation of the raw material, the measuring fixture processed by this method has only a small arc height in the length direction (as shown by arrow L) and only a small range of slots in the width direction (as shown by arrow W), resulting in small deformation. With the assistance of the metal base plate 1, it has less deformation and better accuracy compared to the method of processing a whole piece of raw material.

[0048] Figure 6 The prior art curved glass measuring fixture is shown. It can be seen that the upper surface of the prior art curved glass measuring fixture is an arc-shaped surface that conforms to the concave surface of the curved glass. On the arc-shaped surface, there are abutments (prior art) 7 and measuring point holes (prior art) for measuring instruments 6. It can be seen that the measuring fixture is a single piece, without upper and lower parts, nor is the upper part divided into multiple assembly blocks. During the processing of the prior art curved glass measuring fixture, the maximum length, width, and height of the fixture are used as a reference, and a square piece of material is selected for processing after expanding outwards from this. When processing fixtures with larger dimensions and greater arc height, more material needs to be cut off, making the fixture more prone to deformation. For example, when processing a measuring fixture used for a C-shaped curved 3D glass cover, after processing, due to the extensive cutting on both sides of the material, the fixture will deform downwards in the middle area under the action of internal stress. Overall, the upper part (upper surface) of the measuring fixture will become more convex, thus affecting the accuracy of the measuring fixture and causing the measured value of the cover glass to not match the actual value. The larger the jig size and the thicker the material used, the greater the convexity (or concaveness) of the upper surface of the measuring jig, and the greater the deformation caused by stress. Current processing methods involve first planing the back side of the raw material, then roughing the front side, followed by a second planing of the back side, and finally finishing the front side. While this process optimizes the sequence, reducing jig deformation during roughing to some extent, it doesn't fundamentally solve the problem.

[0049] This invention provides a processing method for reducing the bending deformation of curved glass measuring fixtures. In order to reduce the influence of stress deformation on the measurement results, this processing method uses a combination of multiple support blocks 2 and a heat-treated metal base plate for fixing, which greatly improves the deformation of the measuring fixture after processing, thereby making the measurement data more accurate.

[0050] It should be noted that the components or steps in the above embodiments can be interchanged, substituted, added, or deleted. Therefore, the combinations formed by these reasonable permutations and transformations should also fall within the protection scope of this invention, and the protection scope of this invention should not be limited to the above embodiments.

[0051] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0052] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A processing method for reducing bending deformation of curved glass measuring fixtures, characterized in that, Includes the following steps: The plate is used as the base plate (1) of the measuring fixture, and threaded holes (4) are machined on it; the base plate (1) is a square metal plate of a predetermined thickness that has undergone heat treatment; According to the common height of the fixture, a number of support blocks (2) of different heights are prepared with a first predetermined distance as a gradient. The bottom of the support block (2) is machined with mounting holes (5). The jig design drawing is divided into segments at a second predetermined distance. According to the height of the highest point of each segment of the jig design drawing, a support block (2) with the same height is selected as the support block (2) for this segment. Several selected support blocks (2) are installed onto the base plate (1) in sequence according to the fixture design drawing, and the support blocks (2) are fixedly connected to the base plate (1) with bolts (3); wherein, several support blocks (2) are installed side by side onto the base plate (1) and there is no gap between the support blocks (2); the support blocks (2) are not connected by adhesive, but are detachably fixed to the base plate (1) only by bolts (3); The measuring fixture is obtained by roughing and finishing the combination of the support block (2) and the base plate (1).

2. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 1, characterized in that, The bottom of the support block (2) is in contact with the upper surface of the base plate (1), and the upper surface of the base plate (1) is frosted to enhance the friction with the bottom of the support block (2).

3. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 2, characterized in that, The square metal plate is selected from either a square or a rectangular metal plate; the square metal plate is made of aluminum.

4. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 1, characterized in that, The support block (2) is made of acrylic or bakelite.

5. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 1, characterized in that, The support block (2) also includes a measuring point hole (8) for measuring curved glass using a measuring instrument. The position of the mounting hole (5) of the support block (2) is different from that of the measuring point hole.

6. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 2, characterized in that, The fixture design drawing is made based on the concave surface of the curved glass to be measured. The concave surface of the curved glass to be measured serves as the dimensional standard for the measuring fixture, so that the glass and the fixture fit together tightly.

7. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 1, characterized in that, The steps for rough machining the assembly of the support block (2) and the base plate (1) are as follows: The rough blank of the combination of support block (2) and base plate (1) is machined to form the approximate shape of the measuring fixture. The surface of the measuring fixture is rough in this state, and the size of the measuring fixture is slightly larger than the size of the fixture design drawing.

8. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 7, characterized in that, After the rough machining step, the finishing steps for the assembly of the support block (2) and the base plate (1) are as follows: Using a ball end mill on the rough-machined measuring fixture, the details of the measuring fixture are slowly machined out, and all the burrs produced by rough machining are removed. The finished measuring fixture has a smooth surface, and the dimensions of the measuring fixture match the dimensions of the fixture design drawing.

9. The processing method for reducing bending deformation of curved glass measuring fixtures according to claim 7 or 8, characterized in that, When processing the combination of support block (2) and base plate (1), a protruding abutment (9) will be processed in the width and length directions of support block (2) to fix the placement position of curved glass during each measurement.

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