Study for Designing Fixtures Considering Dynamics of Thin-walled Plate- and Box-like Workpieces

Abstract

For workpieces with the wall thickness of 1/100 to 2/100 of the maximum dimension, the possible rate of metal removal is often limited by the onset of machining vibration. By designing workpiece holding devices (fixtures) in such a way that they add to the dynamic rigidity of the workpieces, a high feed rate (700 mm/min in roughing and 1 000 mm/min in finishing) becomes possible in milling plate- and/or box-like castings and weldments. The paper describes fundamental procedures to obtain the appropriate fixture design by experimental and theoretical means respectively, and typical ceiling values below which the maximum dynamic compliance of the workpiece-fixture system should be held for the realization of the target feed rates.