During cutting of low rigidity workpieces, avoiding elastic deformation due to machining forces is important. In multi-axis cutting of jet engine blades, tool posture is typically determined by trial and error based on the computer-aided machining operator’s experience. In this study, we developed a system of quantitative evaluation of machining error for blade surface finishing process by estimating the cutting force at each cutting point of the blade with different relative tool postures, and analyzing the deformation at each point with a finite element analysis. With the system, we become be able to perform simulations to evaluate tool posture with less shape error, maintaining the machining efficiency.

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