MODELLING OF THE PROCEDURE FOR CHECKING THE FIXTURING STABILITY ACCOUNTING FOR WORKPIECE VIBRATORY BEHAVIOUR

This paper presents a model-based framework for the verification of the dynamic stability of a fixtured workpiece during machining. The framework consists of a dynamic model for simulating the vibratory behaviour of the fixtured workpiece subjected to time- and spacevarying machining loads. We present a static model for determining the localized fixture– workpiece contact deformations due to clamping, a geometric model for capturing the continuously changing geometry and inertia of the fixture–workpiece system during machining and a model for checking the dynamic stability of the fixtured workpiece. A simulation example was solved to simulate the vibratory motion of the workpiece and to check the dynamic stability fixtured workpiece that is affected by the fixture–workpiece system dynamics and its continuous change during machining due to the material removal effect.

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