Manipulator detection device and method for residual stress of complex component

Abstract

The invention provides a device and a method for automatically detecting residual stress of a complex component with a manipulator ultrasonic threshold longitudinal-wave contact type coupling refraction method. The device comprises an industrial control computer, a manipulator scanning mechanism and an ultrasonic transmitting and receiving mechanism, wherein the manipulator scanning mechanism comprises a manipulator and a manipulator controller, the manipulator is used for clamping an ultrasonic transducer and keeps connection and communication with the manipulator controller and the industrial control computer; the ultrasonic transmitting and receiving mechanism comprises the ultrasonic transducer, an ultrasonic pulse transmitting and receiving card and a data acquisition card, the ultrasonic pulse transmitting and receiving card and the high-speed acquisition card are installed on the industrial control computer and controlled by the industrial control computer to transmit, receive and acquire pulse signals. A tested sample is arranged in a known fixed position in manipulator moving space, during detecting, the industrial control computer controls the manipulator clamping the ultrasonic transducer to scan the movement track, the ultrasonic transducer emits ultrasound, receives ultrasonic pulse echo signals reflected by the tested sample, extracts sound velocity information in the ultrasonic pulse echo signals and feeds back the sound velocity information to the industrial control computer, so that the feature distribution of the residual stress is acquired.

Description

Technical field [0001] The invention relates to a device and a method for detecting residual stress by means of longitudinal wave contact coupling refraction method of ultrasonic critical value of a manipulator, which can realize automatic detection of residual stress of a test piece, especially for a sample with complex curved surface characteristics. . Background technique [0002] In the prior art, complex components usually have irregular curved surface features or obvious contour curvature changes. Traditional ultrasonic inspection devices based on Cartesian coordinate system for position positioning, data visualization, and image display are difficult to accurately obtain the internal residues of such components. Stress distribution, for example, the aero-engine blade detected by the present invention has a large change in the curvature of the measured surface, and the commonly used contact-type residual stress detection device cannot achieve contour tracking and detection ...

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Problems solved by technology

[0006] The patent application team has been engaged in ultrasonic non-destructive testing and residual stress calibration and control technology for a long time, and has rich research experience in residual stress testing and calibration. It has successively proposed the water coupling nonlinear method to measure residual stress and high-energy sound field local focus to control residual stress, etc. detection methods, but the above methods still cannot meet the needs of automatic detection of residual stress of complex feature specimens

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