Mathematical morphology approach to internal defect analysis of A356 aluminum alloy wheel hubs

Junsheng Zhang; Lihua Hao; Tengyun Jiao; Lusong Que; Mingquan Wang; Junsheng Zhang; Lihua Hao; Tengyun Jiao; Lusong Que; Mingquan Wang

doi:10.3934/math.2020209

AIMS Mathematics

2020, Volume 5, Issue 4: 3256-3273. doi: 10.3934/math.2020209

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Research article

Mathematical morphology approach to internal defect analysis of A356 aluminum alloy wheel hubs

1.
Science and Technology on Electronic Test and Measurement Laboratory, North University of China,Taiyuan 030051, China
2.
Department of Electronic engineering, Taiyuan Institute of Technology, Taiyuan 030008, China

Received: 10 March 2020 Accepted: 24 March 2020 Published: 27 March 2020
MSC : 93A30, 97M10

A356 aluminum alloy is a material widely used in the production of automobile wheels. Internal defects such as gas holes and shrinkage cavities are likely to develop in the process of low pressure casting. X-ray images of the hub are able to provide some information on such defects. This paper proposes a defect extraction method which is built on mathematical morphology. It involves three operations, i.e., the top-hat transform, the top-hat reconstruction transform and the dilation reconstruction. A larger square structuring element and a small threshold are used firstly to obtain all potential defect areas of the hub. A structuring element of a suitable size are applied to different defect areas in subsequent extraction. A new threshold is then decided to get the final defect extraction results. The experimental results show that the above defect extraction method not only works on X-ray hub images, but is robust against the interference caused by noises and hub geometry, and hence can potentially be extensively applied to X-ray detection of hubs.
- mathematical morphology,
- A356 aluminum alloy,
- automobile wheel hub,
- internal defect,
- X-ray testing
Citation: Junsheng Zhang, Lihua Hao, Tengyun Jiao, Lusong Que, Mingquan Wang. Mathematical morphology approach to internal defect analysis of A356 aluminum alloy wheel hubs[J]. AIMS Mathematics, 2020, 5(4): 3256-3273. doi: 10.3934/math.2020209

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Abstract

A356 aluminum alloy is a material widely used in the production of automobile wheels. Internal defects such as gas holes and shrinkage cavities are likely to develop in the process of low pressure casting. X-ray images of the hub are able to provide some information on such defects. This paper proposes a defect extraction method which is built on mathematical morphology. It involves three operations, i.e., the top-hat transform, the top-hat reconstruction transform and the dilation reconstruction. A larger square structuring element and a small threshold are used firstly to obtain all potential defect areas of the hub. A structuring element of a suitable size are applied to different defect areas in subsequent extraction. A new threshold is then decided to get the final defect extraction results. The experimental results show that the above defect extraction method not only works on X-ray hub images, but is robust against the interference caused by noises and hub geometry, and hence can potentially be extensively applied to X-ray detection of hubs.

References

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