Ultrasonic water immersion automatic detection device and method for complex ring forgings

Abstract

The invention discloses an ultrasonic water immersion automatic detection device and method for complex ring forgings. The method comprises the steps of: placing a to-be-detected complex ring forgingin a water tank, carrying out the single detection of a complex curved surface through an ultrasonic phased array, and carrying out the regional detection of a flat end surface through a multi-frequency array water immersion probe according to the detection depth; during detection of complex curved surfaces, determining the optimal emission dynamic aperture array center and the array element number of each detection region according to a dynamic aperture emission focusing method; determining array emission delay time of each region according to a curved surface multi-medium emission focusing delay time calculation method, and calculating delay superposition time of all sampling points of each region according to a dynamic received beam synthesizer delay algorithm; during detection of the flat end face, selecting array water immersion probes of various different frequency models, and achieving full-coverage detection of the end face of the ring forging. A complete water immersion methodis adopted, the problem of poor coupling is solved, and full-coverage ultrasonic nondestructive testing can be achieved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and in particular relates to an automatic ultrasonic water immersion testing method and device for complex ring forgings, which are suitable for automatic nondestructive testing of ring forgings of various sizes and complex sections. Background technique [0002] Large complex ring products such as petrochemical pipeline ball valve bodies, nuclear power main pump sealing metal rings, aero-engine casing rings, launch vehicle rocket body transition rings, etc. are key components widely used in energy petrochemical, aerospace and national defense equipment. This type of ring has a large diameter, thick ring wall, and often has complex shapes such as steps, grooves, and rounded corners in the cross-section, and is mostly used in extreme environmental conditions. The surface and interior of complex ring forgings often produce various defects, such as shrinkage cavities, poros...

AI Technical Summary

Problems solved by technology

At present, the ultrasonic testing of large-scale rings is mainly manual, that is, hand-held conventional ultrasonic instruments scan, judge and record defects along the surface of the ring. The testing process and result evaluation are completely dependent on manual experience, and the repeatability and reliability of the test results are poor. , it is easy to cause missed detection and misjudgment of defects

Therefore, manual detection is difficult to meet the precise detection requirements for full coverage of large and complex rings

[0003] The existing ultrasonic testing system can only meet the detection of rectangular rings. For ring forgings with complex cross-sections such as grooves, steps, and large curvature arcs, the accessibility of conventional ultrasonic direct emission beams is poor, and the ultrasonic reflection and scattering at the interface is serious. The detection echo signal is messy, the defect reflection echo is weak, and there is a large detection blind area; the synthetic wave front of the ordinary ultrasonic phased array sector scan and focused emission cannot fit the complex ring forging, the ultrasonic incident energy is weak, and the detection ability is poor

[0004] At present, ultrasonic phased array detection of curved surface components is generally carried out through wedge and coupling agent contact detection. This detection method cannot be applied to a rapid automatic detection system, and there are problems such as unstable coupling conditions and low detection efficiency.

In addition, the current conventional ultrasonic phase-controlled imaging method will cause serious acoustic beam emission on multi-medium surfaces, and cannot adapt to the incidence of complex ring forging surfaces, resulting in chaotic detection signals and low imaging resolution, which is not conducive to quantitative detection of defects. For thick-walled complex Ring forgings have poor accessibility and limited effective detection range

At present, the phased array generally adopts the emission all-focus imaging algorithm, and achieves point-by-point focusing at different positions inside the workpiece by changing the emission delay time. However, due to the time required for sound beam propagation, tens of thousands of emission focusing processes are required for one frame of image, which seriously affects the imaging speed. , unable to achieve real-time imaging, it is difficult to apply to industrial automatic detection system

Images