Probe adaptively adjusted thin-wall part on-machine ultrasonic thickness measuring method

Abstract

The invention belongs to the technical field of ultrasonic detection, and relates to a probe adaptively adjusted thin-wall part on-machine ultrasonic thickness measuring method. In the thickness measuring method, a ball-shaft mechanism is adopted to act as an adaptive adjustment mechanism, and a coupling agent injection mechanism is utilized to provide stable coupling liquid level for ultrasonic thickness measurement; in order to reduce thickness measurement impact and improve the contact stability, a spring is adopted to act as an elastic buffer; a limit switch is adopted to detect the device contact state so as to ensure the thickness measurement process to be safe; and a transit time difference based thickness calculation method is adopted, and the thickness of a current measuring point of a measured workpiece is calculated according to the time difference of ultrasonic echoes of the upper surface of the lower surface of the workpiece and the ultrasonic propagation velocity. According to the method, the angle and the position of a probe can be automatically adjusted according to the local surface shape of the measured workpiece so as to achieve an ideal normal consistent state. The method provided by the invention has the advantages of high adaptive ability, wide angle adjustment range, high measurement accuracy, ability of performing automatic on-machine thickness measurement in real time, high measurement efficiency and good stability.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection, and relates to an on-machine ultrasonic thickness measurement method of a thin-walled part with adaptive adjustment of a probe. Background technique [0002] Thin-walled parts are typical parts of major equipment in the aerospace field, such as rocket fuel tank wall panels, aircraft skins, etc. The remaining wall thickness of the processed parts must meet the processing requirements of equal wall thickness or variable wall thickness according to a certain rule , and the remaining wall thickness is often the core requirement for the processing of such parts. In order to ensure that the final processed parts meet the remaining wall thickness requirements, it is necessary to measure the corresponding wall thickness data and complete the processing quality evaluation of the parts. Since the rigidity of the part is relatively low, and the deformation during processing cannot be ignored, ...

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Problems solved by technology

[0005] The problem to be solved by the present invention is to overcome the deficiencies of the existing methods, and to solve the problems that the ultrasonic probe is difficult to keep consistent with the normal direction of the measured point on the curved surface, the ultrasonic detection echo is unstable, and the received signal attenuation is large, and an adaptive probe is invented. On-machine Ultrasonic Thickness Measurement of Adjusted Thin-walled Parts

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