The accuracy of Laser Demarcation Instruments (LDIs) determines the efficiency and quality of subsequent measurements. After investigating the existing calibration method of LDIs, a new LDIs calibration device is designed in this paper based on image vision detection technology. The calibration method is convenient, high detection accuracy and high efficiency, and realizes digital calibration. This paper completes the overall design of the calibration system for LDIs, designs the mechanical structure of the image acquisition device and the working platform of the LDIs, and selects the relevant devices. The mechanical structure of the system is composed of an image acquisition device, a standard vertical line and a working platform for LDIs, which can calibrate the laser line width, horizontal tilt error of the laser line, and vertical tilt error of the laser line. Experiments were carried out, and the collected laser line images were processed by the computer to record and save the calibration results. The measurement uncertainty of the measurement results was evaluated.
In the field of aeronautics, the geometry and dimensional accuracy of the blade edges has a large influence on the aerodynamic performance of aero engine. Therefore, a non-contact optical scanning system is established to realize the measurement of leading and trailing edges of blades in a rapid, precise and efficient manner in the paper. Based on the mechanical framework of a traditional CMM, the system is equipped with a specified sensing device as the scanning probe, which is made up by two new-style laser scanning sensors installed at a certain angle to each other by a holder. In the measuring procedure, the geometric dimensions of the measured blade edges on every contour plane are determined by the contour information on five transversals at the leading or trailing edges, which can be used to determine the machining allowance of the blades. In order to verify the effectiveness and practicality of the system set up, a precision forging blade after grinded is adopted as the measured object and its leading and trailing edges are measured by the system respectively. In the experiment, the thickness of blade edges on three contour planes is measured by the optical scanning system several times. As the experiment results show, the repeatability accuracy of the system can meet its design requirements and the inspecting demands of the blade edges. As a result, the optical scanning system could serve as a component of the intelligent manufacturing system of blades to improve the machining quality of the blade edges.
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