A straightness error measuring device based on light gap method and its application method
A technology of straightness error and measuring device, which is applied in the field of precision measurement, can solve the problems of three-coordinate measuring instrument, which is not portable, expensive, and unable to perform online measurement, etc., and achieves broad market application prospects, low cost, and simple measurement Effect
Active Publication Date: 2020-01-24
DALIAN UNIV OF TECH
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However, the three-coordinate measuring instrument is large in size, not portable, expensive, and unable to perform online measurement
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[0031] Taking the measurement of the straightness error of a 300mm×300mm high-precision flat plate by using a 400mm refined knife-edge ruler as an example, the specific implementation method of the present invention is described.
[0032]1) Parts are refined first before assembly. In order to improve the accuracy of the 400mm commodity 0-level knife-edge ruler, a 300mm×300mm high-precision grinding plate with a flatness error of less than 0.5μm after grinding is used to refine the knife-edge ruler, which can more than double the accuracy of the knife-edge ruler. The straightness error of the final 400mm 0-level knife-edge ruler is not more than 0.5 μm; use the above-mentioned high-precision grinding plate to fix the slotted end cover 1-1, end cover 1-2, and rear plate 1-4 of the knife-edge ruler clamping device 1 The bottom surface and the clamping surface 1-6 are refined. After refinement, the flatness error of the bottom surface of the slotted end cover 1-1 and the end cover...
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The invention belongs to the technical field of precision measurement, and relates to a plane straightness error measuring device and a using method thereof. The device comprises a knife-edge ruler clamping device, a refined knife-edge ruler, a variable-wavelength LED strip, an acrylic film, an LED strip control device and a power supply. The knife-edge ruler clamping device of the invention solves the problem that a knife-edge ruler deflects from a measured plane when held by a hand. By refining the straightness error of the knife-edge ruler, the precision of straightness error measurement byusing a knife-edge ruler based on a light gap method is improved. By integrating the variable-wavelength LED strip and an observation hole into the clamping device, the measurement is simpler and more convenient. The size of the gap between the knife-edge ruler and the measured plane is judged according to the visibility of light of different wavelength, and then, the straightness error of the measured plane is judged. The measurement precision of the device is more than doubled compared with the traditional straightness error measurement by using a knife-edge ruler based on a light gap method. The device has the advantages of high measurement efficiency, convenient use and low cost, and has a broad market application prospect.
Description
technical field [0001] The invention belongs to the technical field of precision measurement, and relates to a straightness error measuring device based on the light gap method and a use method thereof. Background technique [0002] Straightness is a common form and position tolerance. Commonly used methods for measuring straightness errors include knife-edge ruler method, gravity method, optical alignment method, laser alignment method, and straightness measuring instrument. [0003] Commonly used knife-edge rulers are measured by the light gap method and indicator method. This measurement method does not require measuring indicators or special sensors. It only uses the human eye to judge the size of the gap between the knife-edge ruler and the measured workpiece according to the color change of the light after light transmission. . The knife-edge ruler is a kind of ruler with a cutting-edge-shaped measuring surface, which is used to measure the plane shape error of the wo...
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IPC IPC(8): G01B11/27
Inventor 凌四营凌明张慧阳刘瑞坤高东辉
Owner DALIAN UNIV OF TECH