Offline adaptive control Online publication date: Fri, 22-Oct-2010
by K.P. Karunakaran, Mihir Shah, R. Shringi, A. Bernard, P.J. Arrazola
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 8, No. 3/4, 2010
Abstract: CNC machining is the only option for rapid manufacturing of components with stringent quality requirements. But the bottleneck to CNC machining is the generation of fool-proof CNC programs. While the CNC programmer is able to generate the correct cutter paths using CAM systems, it is not as easy with the cutting parameters. Adaptive control is able to overcome this difficulty but it requires expensive online force measurements. An alternative is to predict the cutting forces offline from the geometry, kinematics, material properties and cutting parameters. A process model developed for this calculates the optimal cutting parameters at any instant from the contact surface between the cutter and work piece. This hybrid model captures the invariant characteristics of the process in six cutting coefficients determined through simple experiments. This model is applicable to complex machining involving the generic cutter and motions up to five degrees of freedom.
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