High-frequency vibration system and method for nondestructive testing of microcracks on surface layer of small-size component

Abstract

The invention relates to the technical field of nondestructive testing of miniature components, in particular to a high-frequency vibration system and a high-frequency vibration method for nondestructive testing of microcracks on a surface layer of a small-size component. The high-frequency vibration system is composed of an upper computer system, a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration energy amplification device, a cushion block, a strain gauge and a dynamic strain gauge, wherein the upper computer system controls the signal generator to output a high-frequency vibration excitation signal, the high-frequency vibration excitation signal is amplified by means of the power driver and then input into the electromagnetic vibration exciter, and then the electromagnetic vibration exciter is driven to generate high-frequency vibration; the small-size component is installed on the upper surface of a workbench; the strain gauge is adhered to the peak residual stress position of the small-size component; and a peak value of a strain signal acquired by means of the dynamic strain gauge when microcracks exist on the surface layer ofthe small-size component changes suddenly compared with a peak value of a strain signal when no microcracks exist on the surface layer of the small-size component. The high-frequency vibration systemand the high-frequency vibration method have the advantage of being capable of realizing the detection of the microcracks on the surface layer of the small-size component by adopting a vibration modeanalysis technology.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of micro components, in particular to a high-frequency vibration system and method for non-destructive testing of microscopic cracks on the surface of small-sized components. Background technique [0002] With the rapid development of manufacturing technology, small-sized components have been widely used in the field of mechanical engineering. However, the process from materials to small-sized components is inseparable from the role of various processing techniques, and it is easy to introduce Microscopic cracks seriously restrict the improvement of the quality of small-sized components. Therefore, it has become an important topic in the research field of small-sized components to detect whether there are microscopic cracks on the surface of small-sized components. is of great significance. [0003] Currently widely used detection methods for cracks or cracks mainly include electr...

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Problems solved by technology

[0005] In order to overcome the disadvantage that the existing technology cannot detect microscopic cracks on small-sized components through vibration modal analysis technology, the present invention proposes a high-frequency vibration system and method for non-dest...

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