Batch Drilling Process Quality Inspection Based on Vibration Signal Mapping Model

To inspect the quality of batch drilling quickly, a new approach based on vibration signals is presented in this paper. Firstly, according to the contact conditions between drilling blades and workpiece, three stages closely related with the drilling quality is extracted from the whole drilling process and they are named the stage of drilling guide, the stage of drilling and the stage of drilling out; Secondly, the orthogonal envelope method is used to solve the instantaneous amplitude and instantaneous frequency of the vibration signals, and the instantaneous feature points of the mentioned three stages can be located; Lastly, the stages are numerically split by these corresponding instantaneous feature points. The results show that the instantaneous feature points could be extracted under the error of 3%, and the batch drilling quality can be evaluated accurately.