Method for checking damage of metal part and device thereof

Abstract

The invention relates to the field of nondestructive testing, and discloses a method for checking damage of a metal part and a device thereof. The metal part is provided with a flat surface, the metalpart is placed horizontally, a sphere which can freely fall onto the flat surface of the metal piece along a vertical path is arranged, and by collecting two reference values of a decibel value generated when the sphere touches the metal part and the number of times of the sphere touching the metal part, the two reference values are compared with the corresponding standard values. Manual beatingof a worker is replaced by impact on the flat surface of the metal part formed by using free falling body of the sphere, the strength of each initial impact is uniform, and interference of human factors is reduced. A sound sensor is used for measuring the sound and the number of times generated by impact, damage is identified compared with the standard values, and generation of situations of misjudgment by ears and eyes and damage missing detection by the human factors is prevented. A vibration sensor is used for measuring a vibration value instead of hand feeling vibration, and the effect ismore intuitive.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a method and a device for detecting damage to metal parts. Background technique [0002] At present, the flaw detection of many metal parts mainly relies on ultrasonic testing, such as railway rails, which are the basic load-bearing structure of railway tracks, used to guide locomotives and vehicles, and at the same time provide the contact surface with the least resistance for the rolling of the wheels. The rails require sufficient Bearing capacity, flexural strength, fracture toughness, stability, rails used on railways must withstand enormous pressure, and high-quality steel is required. Railway rails have higher requirements for steel than other applications, and a small flaw The appearance of railway rails will cause the rails to break at any time and cause the train to derail, so its flaw detection is particularly important. [0003] High mangan...

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Problems solved by technology

[0003] High manganese steel cast frog rails are currently commonly used rails, which are cast products. The rails have the characteristics of coarse grains, and the ultrasonic waves will scatter during the flaw detection process, resulting in disordered signals received by the instrument, which cannot be detected. Railway workers We can only judge whether there is any injury by tapping the traditional small hammer, listening to the echo, watching the number of times the small hammer takes off and the vibration. The experience and feeling of damage, the missed detection and misjudgment rate are very high, which may cause unnecessary waste of materials, and secondly, the damaged parts may be put into use, which will eventually lead to immeasurable and serious consequences.

[0004] Similarly, other metal parts that may conflict with the ultrasonic flaw detection mechanism cannot be detected smoothly during ultrasonic flaw detection. Develop a damage inspection device with strong applicability

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