Method for measuring double-sided arc-shaped smoothing plate

Abstract

The invention belongs to the field of advanced structure ceramic product measurement, and particularly relates to a measuring tool and a measuring method for a double-sided arc-shaped smoothing plate. The measuring method of the double-sided arc-shaped smoothing plate comprises the following steps: placing the double-sided arc-shaped smoothing plate on a clamp, enabling a to-be-measured surface of the double-sided arc-shaped smoothing plate to face upwards, and keeping a reference side surface horizontal; after the dial indicator height measuring instrument is aligned with the center of the curved surface of the to-be-measured surface, data of the concave arc and the convex arc of the double-sided arc smoothing plate are measured respectively, and whether the measured data are within a tolerance reference range is judged. The measuring method for measuring the double-sided arc-shaped smoothing plate has the advantages of being convenient to measure and operate and accurate in measuring precision, the production efficiency is improved, and the measuring requirement for full inspection of batch products is met.

Description

Technical Field

[0001] This invention belongs to the field of advanced structural ceramic product measurement, and in particular, it relates to a measuring tool and method for a double-sided arc-shaped flat plate. Background Technology

[0002] In the industrial production process of ceramic substrates, the green body is prone to warping and deformation after sintering due to problems such as thermal stress release and uneven component shrinkage. If the deformation exceeds the precision requirements of subsequent processes such as encapsulation and circuit printing, a smoothing plate is needed for targeted correction and smoothing to restore the flatness of the green body. As the core kiln furniture of this correction process, the structural design and performance parameters of the smoothing plate directly determine the correction effect. According to the shape of the working surface, it can be divided into two main categories: flat smoothing plates and curved smoothing plates. Among them, the curved smoothing plate is a special kiln furniture designed for the non-uniform warping scenarios of specific types of ceramic substrates (such as thin and large-size substrates). Both its front and back sides are processed with slightly curved concave and convex surfaces that meet specific correction requirements. Through the precise fit between the curved surface and the warped shape of the green body, local stress adjustment and deformation correction are achieved.

[0003] Curved smoothing plates are generally made of corundum mullite or high-purity alumina ceramic, which have high hardness and excellent wear resistance. However, they are also accompanied by defects such as high brittleness and poor machinability. This makes it impossible to rely on conventional surface grinding equipment to process the concave and convex surfaces of curved smoothing plates, and also brings challenges to the subsequent curvature measurement process.

[0004] For curved surface plates, the curvature accuracy of their concave and convex surfaces is the core indicator determining the correction effect. Therefore, curvature measurement after processing is a crucial step in ensuring product quality. However, due to the influence of material properties and surface structure, existing measurement technologies have the following shortcomings: On the one hand, the curved flat plate has a non-planar structure on both sides. When it is placed on a traditional planar measuring workbench, conventional planar measuring equipment cannot achieve effective positioning, making it difficult for the measuring probe to accurately fit the curved surface contour. Not only can it not obtain accurate curvature data, but it may also cause scratches on the curved surface due to positioning deviation, further affecting product quality.

[0005] On the other hand, existing feasible measurement methods are extremely inefficient, creating a significant contradiction with the demands of mass production. Currently, the only method in the industry that can guarantee measurement accuracy is to directly attach a magnetic universal base to the machining head of a vertical machining center after surface grinding, and then use a lever dial indicator mounted on the base to measure the arc data of the concave and convex surfaces point by point. This method consumes the machining center's production time, and since the machining center is the core production equipment, its main function is to complete grinding rather than measurement, it prevents the equipment from continuously carrying out mass production, significantly reducing the overall output efficiency of the production line.

[0006] Based on the above situation, the curvature measurement of curved slabs faces the dual dilemma of unreliable accuracy and severely insufficient efficiency. Summary of the Invention

[0007] The purpose of this invention is to provide a measurement method for a double-sided curved flat plate.

[0008] Another object of the present invention is to provide a measuring tool for a double-sided curved flat surface.

[0009] A method for measuring a double-sided arc-shaped smoothing plate according to a specific embodiment of the present invention includes the following steps: (1) Select the concave arc surface of the double-sided arc-shaped flat plate as the test object, clamp the double-sided arc-shaped flat plate on the measuring tool, so that the concave arc surface of the double-sided arc-shaped flat plate faces upward and the reference side surface remains horizontal. (2) After aligning the dial indicator height measuring instrument with the center of the concave arc surface, measure to obtain the arc data of the concave arc surface; (3) Select the convex arc surface of the double-sided arc-shaped flat plate as the test object, clamp the double-sided arc-shaped flat plate on the measuring tool, so that the convex arc surface of the double-sided arc-shaped flat plate faces upward and the reference side remains horizontal. (4) After aligning the dial indicator height measuring instrument on the measuring tool with the center of the convex arc surface, measure to obtain the arc data of the convex arc surface.

[0010] In this invention, the center of the curved surface is the perpendicular foot of the projection of the curvature center of the arc-shaped curved surface onto the flat plate surface (i.e., the geometric center of the curved surface on the plate surface), which can also be called the geometric center of the plate surface.

[0011] The reference side refers to the plane formed by the non-arc side (usually rectangular side) of the double-sided arc-shaped flat plate.

[0012] This invention establishes a unified measurement benchmark by taking "keeping the reference side horizontal" as the core requirement for clamping, ensuring consistency in clamping posture for different batches and different workpieces, and effectively avoiding measurement errors caused by clamping benchmark offset. Furthermore, the "curved surface center" is selected as the core measurement benchmark point, and its measurement data can intuitively reflect the overall contour accuracy of the curved surface, enabling more accurate capture of curved deviations.

[0013] According to a specific embodiment of the present invention, a method for measuring a double-sided arc-shaped smoothing plate is provided. When the arc data of the convex arc surface and the arc data of the concave arc surface are both within the tolerance reference range, the double-sided arc-shaped smoothing plate is judged to be qualified.

[0014] The tolerance reference range refers to the permissible range of variation in geometric or physical parameters such as dimensions, shape, position, and roughness of a product in machining and product manufacturing, in order to ensure the assembly accuracy and performance of parts.

[0015] According to a specific embodiment of the present invention, a method for measuring a double-sided arc-shaped flat plate is provided. If the arc data of the convex arc surface exceeds the tolerance reference range, the double-sided arc plate is rotated 180° around the diagonal axis and then re-clamped on the measuring tool, and the arc data is re-measured according to step (4).

[0016] According to a specific embodiment of the present invention, a method for measuring a double-sided arc-shaped flat plate is provided. If the arc data of the concave arc surface exceeds the tolerance reference range, the double-sided arc plate is rotated 180° around the diagonal axis and then re-clamped on the measuring tool, and the arc data is re-measured according to step (2).

[0017] By taking the step of "rotating 180° and measuring again", the source of measurement error can be effectively distinguished (whether it is a problem with the precision of the plate itself or a clamping deviation), avoiding misjudgment of qualified products due to improper clamping once, and improving the accuracy of quality inspection.

[0018] If the measured value still exceeds the tolerance reference range after the "re-measure by rotating 180°" step, it is initially judged as unqualified; if the measured value is within the tolerance reference range, the original measurement steps are restored, and the repeatability of the measurement data is compared and checked. Repeated data is judged as unqualified.

[0019] The present invention also provides a measuring tool for a double-sided curved surface plate, the measuring tool comprising a worktable, wherein a high-precision flat-nose vise, a dial indicator, a height measuring instrument, and a positioning pad are disposed on the worktable, wherein... The dial indicator height measuring instrument is fixed on the workbench to measure the arc data of the double-sided arc-shaped flat plate; The high-precision flat-jaw vises include a fixed jaw and a movable jaw. The fixed jaw is mounted on the worktable, and the movable jaw can reciprocate linearly along the worktable to clamp the double-sided arc-shaped flat plate. The high-precision flat-jaw vises can reciprocate linearly along the worktable.

[0020] The number of positioning pads is two, and the two positioning pads are respectively attached to the inner sidewalls of the fixed clamp body and the movable clamp body.

[0021] This invention integrates all measuring components into the same workbench, reducing the reference deviation caused by the scattered placement of components, improving the overall accuracy of the measuring tool, and forming a complete measurement system of support, positioning and measurement among the components. The entire measurement process can be completed without the need for additional equipment, and there is no need to occupy a machining center, reducing the equipment investment cost of the factory. The compact structural layout saves workshop space, facilitates the flow of workpieces during batch testing, and improves the testing effect.

[0022] Two positioning pads form a symmetrical positioning support with the center of the curved surface as the reference side, which fits precisely with the reference side of the flat plate, further enhancing the stability of the clamping and positioning and preventing the flat plate from twisting during the measurement process; at the same time, the position can be flexibly adjusted according to the size of different flat plates, improving the versatility of the measuring tool.

[0023] Preferably, the two positioning pads are in line contact with the curved surface of the double-arc surface flat plate. This line contact tangential fit ensures precise contact between the positioning pads and the curved surface of the flat plate, while avoiding poor contact or scratches on the curved surface caused by surface contact.

[0024] Preferably, the error of the three support points of the positioning pad is less than 0.005mm, ensuring the flatness of the support plane formed by the three support points, avoiding workpiece clamping offset caused by the tilt of the support plane, and reducing measurement error.

[0025] After placing the flat plate on the positioning pad, gently press the center of the flat plate to ensure that the three contact points form a reference surface.

[0026] The beneficial effects of this invention are: This invention relates to a specialized measuring tool designed based on the structure of a double-sided curved flat surface. This specialized measuring tool is used to accurately position and clamp the product and measure its curvature. The measurement operation is convenient, accurate, and efficient.

[0027] The measurement method for the double-sided arc-shaped flat plate of the present invention has the characteristics of convenient measurement operation and accurate measurement accuracy, which is conducive to improving production efficiency and meeting the measurement requirements of full inspection of batch products. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the structure of the measuring tool according to an embodiment of the present invention; Among them, 1-workbench; 2-micrometer height measuring instrument; 3-high precision flat-nose pliers; 4-positioning pad; 5-double-sided arc-shaped smoothing plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Example 1

[0031] This embodiment provides a high-precision measuring tool adapted to double-sided curved surface plates made of corundum mullite / alumina ceramic material, suitable for rapid detection of curved surface plate data in mass production in factories.

[0032] like Figure 1 As shown, the measuring tool includes a workbench 1, on which a high-precision flat-nose vise 3, a dial indicator height measuring instrument 2, and a positioning pad 4 are mounted. The worktable 1 provides a stable reference bearing surface for the entire measuring tool, and the flatness error of the worktable surface is ≤0.002mm / m. 2 .

[0033] The dial indicator height measuring instrument 2 is set on the workbench 1 to measure the arc data of the double-sided arc-shaped flat plate 5; The high-precision flat-nose vise 3 includes a fixed vise body and a movable vise body. The fixed vise body is fixed on the worktable 1, and the high-precision flat-nose vise 3 can move left and right along the worktable 1.

[0034] The movable clamp and the fixed clamp are connected by a rectangular guide rail pair with a guide rail gap of ≤0.002mm. The movable clamp is driven by a precision trapezoidal screw and can make linear reciprocating motion along the guide rail with a linearity error of ≤0.001mm / 100mm, thus achieving precise clamping of the double-sided arc-shaped flat plate.

[0035] The number of positioning pads 4 is two, and the two positioning pads are respectively attached to the inner sidewalls of the fixed clamp body and the movable clamp body.

[0036] The positioning pad 4 is made of ceramic material, which has the characteristics of high hardness and high wear resistance, meeting the needs of batch testing in factories.

[0037] The top surface of the positioning pad 4 is machined into a narrow strip-shaped plane with a width of 1mm. The length direction of the narrow strip is parallel to the generatrix direction of the arc surface of the double-sided arc-shaped flat plate 5, ensuring that the top surface of the pad and the arc surface of the flat plate are in line contact and tangential fit, avoiding positioning deviation caused by surface contact.

[0038] The height error of the three support points of the positioning pad is ≤0.005mm. The three support points are distributed in an isosceles triangle to ensure support stability and prevent the flat plate from tilting during measurement.

[0039] The dial indicator height measuring instrument 2 can be fixed on the worktable 1 via a magnetic base. It has a measuring range of 0-10mm and a measuring accuracy of 0.001mm, meeting the high-precision measurement requirements for curved data. The installation height of the dial indicator height measuring instrument 2 is adjustable, ensuring that the probe can be accurately aligned with the center of the curved surface of the double-sided curved surface plate, enabling rapid reading of curved data.

[0040] The measuring tool in this embodiment solves the problem of determining the measurement datum for a double-sided curved flat plate by using line contact tangential fit and high-precision positioning, providing reliable tooling support for subsequent measurement methods.

[0041] Example 2: Measurement Method for a Double-Sided Curved Smoothing Plate Based on the Measuring Tool of Example 1 This embodiment, based on the dedicated measuring tool of Embodiment 1, provides a high-precision measurement method for a double-sided curved surface plate. Taking a curved surface plate product of 102×72×6mm with a concave-convex curvature requirement of 0.095±0.020mm as an example, the measurement steps are as follows: (1) Select the concave arc surface of the double-sided arc-shaped flat plate as the test object, clamp the double-sided arc-shaped flat plate on the measuring tool, so that the concave arc surface of the double-sided arc-shaped flat plate faces upward and the reference side surface remains horizontal. Specifically, place the double-sided curved surface plate on the positioning pad, with the top surface of the positioning pad making line contact and tangential fit with the curved surface of the surface plate. Slowly clamp the high-precision flat-jaw pliers so that they grip the side of the double-sided curved surface plate. Move the high-precision flat-jaw pliers on the worktable so that the probe of the dial indicator height measuring instrument is aligned with the center of the curved surface of the double-sided curved surface plate.

[0042] (2) After aligning the dial indicator height measuring instrument with the center of the concave arc surface, measure and obtain the arc data of the concave arc surface, that is, determine whether the measured data is within the tolerance reference range. The actual measured data is 0.085-0.115mm, which meets the requirements.

[0043] If the arc data of the concave arc surface exceeds the tolerance reference range, rotate the double-sided arc plate 180° around the diagonal axis, re-clamp it on the measuring tool, and re-measure the arc data according to step (2).

[0044] (3) Select the convex arc surface of the double-sided arc-shaped flat plate as the test object, clamp the double-sided arc-shaped flat plate on the measuring tool, so that the convex arc surface of the double-sided arc-shaped flat plate faces upward and the reference side remains horizontal. (4) After aligning the dial indicator height measuring instrument on the measuring tool with the center of the convex arc surface, measure and obtain the arc data of the convex arc surface, that is, determine whether it is within the tolerance reference range. The measured data is 0.085-0.115mm, which meets the requirements. If the arc data of the convex arc surface exceeds the tolerance reference range, rotate the double-sided arc plate 180° around the diagonal axis and re-clamp it on the measuring tool, and re-measure the arc data according to step (4). If the measured value still exceeds the tolerance reference range, it is initially judged as unqualified; if the measured value is within the tolerance reference range, restore the original measurement steps, compare and check the repeatability of the measurement data, and judge the repeated data as unqualified.

[0045] The present invention also includes a pre-testing preparation step: select a newly processed double-sided arc-shaped flat plate, remove unqualified blanks with cracks or chipped edges on the surface, and mark the center of the curved surface on the double-sided arc-shaped flat plate.

[0046] The measurement method in this embodiment is standardized and effectively avoids clamping errors by using rotational retesting, ensuring the accuracy of measurement results and significantly improving measurement efficiency to meet the testing needs of mass production.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of measuring a double-curved arc-shaped smoothing plate, characterized by, The measurement method comprises the following steps: (1) Selecting a concave arc surface of a double-sided arc smoothing plate as a detection object, clamping the double-sided arc smoothing plate on a measuring tool, making the concave arc surface of the double-sided arc smoothing plate face upward, and keeping the reference side surface horizontal; (2) After aligning the center of the curved surface of the concave arc surface with the height gauge, measuring, the arc data of the concave arc surface is obtained; (3) Selecting a convex arc surface of the double-sided arc smoothing plate as a detection object, clamping the double-sided arc smoothing plate on the measuring tool, making the convex arc surface of the double-sided arc smoothing plate face upward, and keeping the reference side surface horizontal; (4) After aligning the center of the curved surface of the convex arc surface with the height gauge on the measuring tool, measuring, the arc data of the convex arc surface is obtained.

2. The method of measuring a double-sided arc-shaped smoothing plate according to claim 1, wherein When the arc data of the convex arc surface and the arc data of the concave arc surface are both within the tolerance reference range, the double-sided arc smoothing plate is judged to be qualified.

3. The method of measuring a double-sided arc-shaped smoothing plate according to claim 2, wherein If the arc data of the convex arc surface exceeds the tolerance reference range, the double-sided arc plate is rotated by 180° around the diagonal axis, re-clamped on the measuring tool, and the arc data is re-measured according to step (4).

4. The method of measuring a double-sided arc-shaped smoothing plate according to claim 1, wherein If the arc data of the concave arc surface exceeds the tolerance reference range, the double-sided arc plate is rotated by 180° around the diagonal axis, re-clamped on the measuring tool, and the arc data is re-measured according to step (2).

5. The method of measuring a double-sided arc-shaped smoothing plate according to claim 1, wherein The measuring tool comprises a workbench, the workbench is provided with a high-precision flat tongs, a height gauge and a positioning pad, wherein, The height gauge is arranged on the workbench to measure the arc data of the double-sided arc smoothing plate; The high-precision flat tongs comprise a fixed tongs body and a movable tongs body, the fixed tongs body is arranged on the workbench, and the movable tongs body can linearly reciprocate along the workbench to clamp the double-sided arc smoothing plate; The positioning pad is two, and the two positioning pads are respectively attached to the inner side walls of the fixed tongs body and the movable tongs body.

6. The method of measuring a double-sided arc-shaped smoothing plate according to claim 5, wherein The two positioning pads and the arc surface of the double arc smoothing plate are in linear contact and tangential cooperation.

7. The method of measuring a double-sided arc-shaped smoothing plate according to claim 5, wherein The three-point error of the positioning pad is less than 0.005 mm.

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