Monitoring of Cylindrical Plurge Grinding Process by Electromechanical Impedance

One of the most promising monitoring techniques is based on electromechanical impedance (EMI) transducers, which are low-cost components and allow easy implementation. EMI signal features showed good results for some applications in previous studies, but it is still unexplored for machining processes, which is essential for metal-cutting industries. This paper presents a new approach to verify the applicability of EMI measurements to monitor surface quality after the plunge cylindrical grinding of non-flat parts, which require low roughness and tight dimensional tolerances. Tests were carried out in a camshaft grinder and two low-cost piezoelectric diaphragms were attached to each workpiece to guarantee redundancy. Roughness R-a was also monitored to check existence of correlation with the EMI signals and relevant discussions regarding monitoring by EMI are presented. Results showed a great correlation between EMI measurement and surface roughness: 0.94 and 0.80 for both diaphragms. Since these diaphragms cost less than 1 US dollar and good correlation was verified, this monitoring system is promising to replace the traditional ones.

Automated summary

This paper introduces the application of electromechanical impedance (EMI) sensors in the metal-cutting industry. By attaching low-cost piezoelectric diaphragms to each workpiece, the correlation between EMI measurements and surface quality can be monitored and verified. The results show a significant correlation between EMI measurement and surface roughness, indicating the promising potential of this monitoring system.