مدل سازي استاتيكي تاثير تكيه گاه هاي كمكي فيكسچر برتختي سطح حاصل از ماشين كاري

STATIC MODELS FOR PREDICTING THE EFFECTS OF SUPPORTS ON MACHINING FLATNESS

ABSTRACT This paper presents analytical two and three dimensional static models for predicting the effects of support parameters (including support position, rigidity and preload) on improving machining flatness. In the two dimensional models, the workpiece is modeled as a cantilever or simply supported elastic beam. In the three dimensional model, the workpiece is modeled as a rigid block held in a machining fixture in contact with locators and clamps (in a 3-2-1 scheme) and three supports (in three locating planes) influenced by machining forces and moments. Milling and creep feed grinding experiments are performed to verify the models.