Influence of Sensor Positioning in Tool Condition Monitoring of Drilling Process through Vibration Analysis

Abstract:

In this study, the relationship between vibration and tool wear and also influence of sensor positioning in tool codition monitoring were investigated during drilling. For this purpose, a series of experiment were conducted in a CNC vertical milling machine using drilling cycle. A 6 mm diameter HSS drill and EN24 as workpiece material were used in these experiments. The vibration was measured in the transverse direction of sensor which is positioned on the workpiece with constant distance from the holes to be drilled for monitoring tool wear as in previous studies. But, positioning of sensor in a constant place with equal distance from all holes to be drilled is not possible for all the workpiece profiles in actual practice. Experiments show that the distance of sensor from the holes in drilling affects the vibration signals for the same state of wear.It shows that the tool wear models presented in previous studies using acceleration signals are sensor location dependent. This work presents a Variance-amplitude of the vibration signals received for tool condition monitoring which is the most sensitive statistical parameter than other statistical parameters such as Root Mean Square (RMS), Exponential, Peak, max-min, mean and standard deviation. Results showed that there was no considerable increase in the vibration amplitude of variance until flank wear value of 0.30 mm was reached, above which the vibration amplitude increased significantly.

• Periodical: Advanced Materials Research (Volumes 984-985)
• Pages: 564-569
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.984-985.564
• Online since: July 2014
• Authors: Ramasamay S. Nakandhrakumar*, D. Dinakaran, S. Satishkumar, M. Gopal
• Keywords: Drilling, Tool Condition Monitoring, Vibration Analysis

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