Abstract
The objective of thrust force control is to maintain the thrust force at a desired level under large variation of the cutting stiffness that occurs during drilling multi-layered workpieces.An approximate dynamic model of the drilling process, relating feedrate and thrust force, is formulated as a linear first order system with time-varying gain. This model is used to formulate a closed-loop controller of the thrust force in drilling a workpiece of composite cutting stiffness. An adaptive control scheme is applied to cope with the time-varying characteristics of the plant.The experimental results show that stabilisation of the thrust force and reduction in machining time can be achieved by the automatic change of the feedrate as a function of workpiece material properties.
Published Version
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