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| Nano-machining AFM Tip Wear Monitoring Based on Time Series Data and Support Vector Machine |
| CHENG Fei1,2,DONG Jing-yan2 |
1. Management School of Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China
2. Fitts Department Industrial & System Engineering of NCSU, Raleigh, NC 27606, USA |
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Abstract Time-series data analysis and pattern recognition using support vector machine (SVM) are studied to monitor the state changes of the AFM tip-based nanomachining process with respect to the machining performance and tip wear. Time series data (i.e. machining force from the process), which has transient, nonlinear, and non-stationary characteristics, is collected by a data acquisition system. Three status detection features including the maximum force, peak to peak force value, and the variance of the collected lateral machining force, are extracted to classify the state of the nanomachining process. Directed acyclic graph support vector machines with a (Gaussian) radial basis kernel function is constructed to identify the tip wear status. Using this multi-class SVM, the machining process and the tip wear can be classified into three regions, which are effective machining with sharp tip, transition region, and bad/no machining with severe tip wear. The experimental data shows that the accuracy of the SVM is over 94.73% in both binary and ternary classifications.
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Received: 16 September 2018
Published: 10 June 2019
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2019, Vol. 40 
