Analysis on signals characteristics for machining condition monitoring in high speed milling process of Inconel 718

摘要

Inconel 718 is widely used in automotive and aerospace industry because it has excellent mechanical properties such as light weight and high rigidity. However, it is typical difficult-to-cut materials, and has poor machinability. In machining of Inconel 718, tool fracture is likely to occur because tool wear is rapidly proceeded and tool temperature becomes high, which is derived from its lower thermal conductivity. Since properties of Inconel 718 are main cause of tool wear and deterioration of workpiece surface condition, tool and workpiece condition monitoring is important in machining. The types of sensors for tool and workpiece condition monitoring are limited because coolant is generally used in machining of difficult-to-cut materials. In this study, the cutting force, acceleration signal and surface roughness are investigated in high speed milling process of Inconel 718 under various cutting conditions. The correlation between signal characteristics by the cutting conditions and machining state such as Tool and workpiece condition are being analyzed.