Monitoring a Drilling Process Using Residual Control Charts

ABSTRACT

Deep-hole drilling methods are used for producing holes with a high length-to-diameter ratio, good surface finish, and straightness. The process is subject to dynamic disturbances that are classified as either chatter vibration or spiraling. In this article, control charts are used to monitor a drilling process in order to detect chatter vibration and to secure production with high quality. These control charts use the residuals obtained from a model that describes the variation in the amplitudes of the relevant frequencies of the process. The results showed that the start of the transition from stable drilling to chatter vibration is detected and that some alarm signals are related to changing physical conditions of the process.

KEYWORDS:

• control charts
• drilling process
• time series

Notes

Note: **, *Significant at the 5 and 10% confidence levels, respectively.