A double-frequency quenching state detection method and system for shaft metal parts

By dividing the detection area on shaft-type metal parts and constructing a regional topology map, and calculating the registration factor of the missing area, the problems of signal incompleteness and waveform distortion in the dual-frequency quenching detection of shaft-type metal parts are solved, and a stable evaluation of the hardened layer depth distribution is achieved.

CN121830802BActive Publication Date: 2026-05-26LIYANG ETERNAL HEAT TREATMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LIYANG ETERNAL HEAT TREATMENT CO LTD
Filing Date
2026-03-09
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

During the dual-frequency quenching test of shaft-type metal parts, the high-temperature residue and surface oxidation after quenching cause the energy of the detection signal to decay, the signal sampling to be incomplete and the waveform to be distorted, making it difficult to ensure the consistency of the shape of the hardened layer depth distribution curve, especially the lack of comparability of the response amplitude in different shaft diameters and step areas.

Method used

The detection area is divided according to the geometric information of the shaft-type metal parts and the probe layout. The first frequency and the second frequency detection signals are collected simultaneously, sampling marks are generated, the regional topology map is constructed and the registration factor of the missing area is calculated. The hardened layer depth of the insufficient detection area is adjusted to form a stable hardened layer depth curve.

Benefits of technology

It ensures the consistency of the hardened layer depth distribution curve in different cross sections and structural regions under conditions of incomplete signal sampling and waveform distortion, and provides a stable assessment of the quenching state.

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Abstract

This invention relates to the field of nondestructive testing technology. It discloses a method and system for detecting the dual-frequency quenching state of shaft-type metal parts. The method includes dividing the detection area according to geometric information and probe layout; simultaneously acquiring first and second frequency detection signals to generate dual-frequency raw data; generating sampling markers according to sampling intervals and waveform changes; distinguishing between stable sampling detection areas and insufficient detection areas; constructing a regional topology map based on the adjacency relationship of the detection areas; calculating the registration factor for the missing area using the stable sampling detection area as a reference under the constraints of the regional topology map and sampling markers; substituting the stable sampling detection area into a preset quenching calibration relationship to obtain the local hardening depth; adjusting the dual-frequency raw data of the insufficient detection area using the registration factor for the missing area; calculating the hardened layer depth of the insufficient detection area; and forming a hardened layer depth curve to achieve nondestructive evaluation with consistent curve shapes for different cross-sections and step areas.
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