MODELING OF TOOL WEAR BASED ON CUTTING FORCES IN TURNING

Tool wear estimation is essential for on-line process control and opti mization. Wear and breakage of the tool are usually monitored by measu ring force, load current, vibration, acoustic emission and temperature . These measurements are important for reliability and for the impleme ntation of an adaptive control system. This paper proposes a developme nt of mathematical models to describe the wear-time and wear-force rel ationships for turning operation. Cutting force components have been f ound to correlate well with progressive wear and tool failure. The res ults show that the ratio between force components is a better indicato r of the wear process, compared with the estimate obtained using absol ute values of the forces. It also eliminates variation in material pro perties, which was identified as a major noise source in signals measu red during machining. This paper presents data on techniques based on force measurement for tool wear monitoring.