A kind of deep camber component surface residual stress short sound path ultrasonic non-destructive probe
One, technical field
The present invention devises a kind of ultrasonic inspection probe being applicable to curvature disaster coupling contact detection means residual stress.This device can inspire critical refraction longitudinal wave and at the short-and-medium acoustical paths of detected component by the non-contacting mode of water coincidence, thus realizes the detection of complex component near surface zonule, surface residual stress.Belong to field of non destructive testing.
Two, background technology
Residual stress is due to uneven stress field, strain field, temperature field and structural heterogenity, the stress remained after deformation in process of metal working.The reliability of mechanical component is had a significant impact by the existence of residual stress, particularly fatigue life, dimensional stability and resistance to corrosion impact on structural member are very big and stress can be caused to concentrate, thus cause material to produce micro-crack, and these crackles cause Materials Fracture under certain condition, thus cause serious accident.Therefore study various situation residual stress measurement to be just particularly important.
Present stage can realize stress analysis to external surface of structural member Magnetic Memory equipment and X-ray stress analysis instrument.Magnetic Memory equipment only can be concentrated by qualitative analysis stress, it is impossible to measures stress value.X-ray stress analysis instrument is difficult to in-site measurement, and has certain harm to human body.Critical refraction longitudinal wave and surface wave counter stress are sensitive, when applying critical refraction longitudinal wave or surface wave to carry out stress mornitoring, in view of the impact of some component curvature, the acoustic beam causing existing contact detection voussoir to be difficult to excite with tested component coupling contact thus wafer is difficult to inspire required waveform through waveform conversion.On the other hand be much detected the demand that the residual stress of its specific tiny area is detected by component in view of the modern times, the residual stress of its zonule can not be detected by existing detection voussoir accurately.The present invention is according to the problems referred to above, design the sensor that the detected component of curvature disaster coupling contact can be carried out residual stress detection, and detection means can detect the distance between sensor and detected component in the residual stress of the vertical and horizontal within zonule simultaneously.The present invention is not only simple in structure, easy to use and also to a certain extent improve detection residual stress efficiency.There is social application prospect widely.
Relative to the most granted patent: it is single that " plate with curved surface residual stress ultrasonic detection transceiver device; application number: CN201110283060 " measures curvature of curved surface, not there is variable curvature curved surface member and the motility of zonule measurement residual stress measurement, on the other hand its invention does not possess and the relevant design thought of modern automation detection, the process causing its detection zones of different is to be completed by the movement of hands, makes detection efficiency be greatly reduced.And mobile accuracy also receives inevitable subjective impact.The method have the characteristics that the residual stress measurement for curved surface has more motility, the steel plate residual stress of different curvature can be measured in the way of noncontact water coincidence.The present invention structurally realizes the detection of short sound path residual stress simultaneously, meets the demand in the detection of curved surface zonule residual stress.Can effectively change the distance of sensor and detected component simultaneously, thus be adjusted flexibly and rub cool scope.On the other hand the present invention is in line with the design philosophy of Aulomatizeted Detect, effectively achieves with the combination of modern industry mechanical hand.Detection efficiency and detection accuracy is caused to be effectively improved.
Three, summary of the invention:
The present invention devises a kind of curvature disaster that is applicable to and places the lossless probe of residual stress ultrasonic measurement of sensor component.This device implements noncontact water coincidence with curved surface and with range finding and vertical and horizontal residual stress detection function, it is ensured that the reliability of measurement result.
The present invention is achieved in that ultrasonic longitudinal wave is the most incident, can inspire critical refraction longitudinal wave in detected component surface and propagate in tested component short distance, it is ensured that the reliability of detection means tiny area.The present invention uses piezoelectric chip as the excitation apparatus of ultrasound wave, it is placed on lucite voussoir and is fixed in movable bracket, it is detected and is fixed on mechanical hand and with robot movement, measuring the distance with blade by piezoelectric patches internal loopback form thus ensure suitable spacing, the stress of the vertical and horizontal of detected component is measured by the most other two groups of piezoelectric chips by one one form received.
Four, accompanying drawing explanation:
Fig. 1Blade surface stress detection device
Accompanying drawingDescription of symbols is as follows: 1, fixed mount 2, seal lid (Fig. 3) 3 detection stress piezoelectric chips 4, water 5, detection curved surface 6, range finding piezoelectric chip 7, lucite voussoir (Fig. 2) 8, fixing screw thread 9, seal groove 10, wire casing
Fig. 2Lucite voussoir is illustratedFigure
Fig. 3Lucite voussoir sealing cover structureFigure
Five, detailed description of the invention:
Below the detailed description of the invention of the present invention is described in detail:
Fig. 1Illustrate for leaf surface residual stress ultrasound detectionFigure, including organic glass wedge block 7 (Fig. 2), capping (Fig. 3), piezoelectric chip 6 of finding range, detects stress piezoelectric chip 3.
When detection means surface residual stress is detected, must be then immersed in water by sensor by being threadedly secured on removable fixed mount in capping.It is detected component to be also immersed in water simultaneously, by movable fixture is control effectively, thus remains that sensor and detected component have suitable interval.Then by other two groups of piezoelectric chip excitation ultrasound ripples successively, thus produce critical refraction longitudinal wave, and make the critical refraction longitudinal wave of generation carry out short-range propagation at the tiny area of detected component, thus detect the horizontal and vertical residual stress of a certain tiny area successively.Then by mobile detected component, the residual stress region of detection required by it is being detected successively.