Non-destructive Surface Abnormality Detection in Metallic Products
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Solution Overview
Problem
Current methods for detecting machining-induced surface and near-surface abnormalities in metallic products, such as white layers, are destructive, costly, and unsuitable for automated inspection, making them inefficient for streamlined manufacturing.
Innovation Solution
A non-destructive detection method using various radiation sources like X-ray, laser, or neutron radiation to compare the intensity and width of scattered radiation peaks with pre-established threshold values derived from reference samples, allowing for the assessment of surface abnormalities without damaging the samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical microscopy is used to detect white layer, then surface abnormalities can be assessed, but the method is destructive and interrupts production
Solution Approach 1:
The patent replaces the mechanical/optical microscopy system with an X-ray diffraction system. Instead of using optical lenses and physical specimen preparation, the invention uses X-ray radiation to probe the crystal structure of the white layer, enabling non-destructive detection that does not interrupt production flow
Solution Approach 2:
The patent introduces X-ray radiation as an intermediary between the detector and the white layer. The X-rays interact with the crystal structure of the white layer and the underlying substrate, producing diffraction patterns that reveal the presence and thickness of the white layer without physical contact or destruction
2Reliability
If destructive testing is performed on batch parts, then abnormalities can be detected, but all parts cannot be tested and some defects remain undetected
Solution Approach 1:
The replacement of destructive mechanical sectioning with non-destructive X-ray diffraction allows every part in the batch to be tested without sacrificing any specimens. The X-ray method preserves the integrity of each part while providing reliable defect detection
3Measurement precision
If cross-sectional microscopy is used, then white layer can be visualized, but the process is costly and time-consuming
Solution Approach 1:
The patent replaces the time-consuming mechanical processes of sectioning, mounting, polishing, and optical imaging with a rapid X-ray diffraction measurement. The X-ray method provides white layer characterization in seconds without any physical preparation steps
Solution Approach 2:
The patent uses X-ray diffraction to obtain information about the white layer that would otherwise require extensive preliminary preparation. The diffraction pattern provides direct insight into crystal structure and phase composition without needing to physically expose or prepare the specimen surface
4Measurement precision
If optical microscopy is employed, then surface abnormalities can be assessed, but additional expenses are incurred
Solution Approach 1:
The X-ray diffraction system serves multiple functions: it detects the presence of white layer, characterizes its crystal structure, determines its thickness, and identifies phase composition. This multi-functionality consolidates what would otherwise require multiple separate inspection operations into a single measurement process
Solution Approach 2:
The replacement of expensive optical microscopy equipment and associated preparation facilities with an X-ray diffraction system eliminates the need for specialized optical benches, microtomes, polishing equipment, and controlled environment chambers, thereby reducing overall manufacturing costs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, cost-effective, and automated detection of surface abnormalities, improving manufacturing efficiency by identifying unwanted machined parts without interrupting the production line and reducing the risk of undetected defects.
Implementation Method 1
transmitting a beam of incident radiation, in this example X-ray radiation, to the sample
Implementation Method 2
assessing a presence of the abnormality from a width and/or an intensity of a produced radiation peak
Implementation Method 3
transmitting a beam of incident radiation, in this example X-ray radiation, to the sample
Implementation Method 4
transmitting a beam of incident radiation, in this example X-ray radiation, to the sample
Data Source
Figure 1~2
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Figure 4
AI summary
A method of non-destructive detection of surface and near surface abnormalities in a metallic product. The method comprises positioning a sample having a surface under a source of an incident radiation. The surface of the sample is then irradiated with the incident radiation from the source. A scattered radiation is detected and a radiation pattern from the detected scattered radiation is produced. Said radiation pattern is then analysed and the output indicative of the scattered radiation from the sample is produced. Said produced output is then compared with a threshold value, the threshold value indicative of a maximum acceptable detected surface abnormality. Finally, the presence of a surface abnormality is identified when the output exceeds the threshold value.