Influence of material removal on the dynamic behavior of thin-walled structures in peripheral milling

Vincent Thévenot (1) , Lionel Arnaud (2) , Gilles Dessein (2) , Gilles Cazenave-Larroche (1)

1 Turbomeca
2 LGP - Laboratoire Génie de Production

Machining is a material removal process that alters the dynamic properties during machining operations. The peripheral milling of a thin-walled structure generates vibration of the workpiece and this influences the quality of the machined surface. A reduction of tool life and spindle life can also be experienced when machining is subjected to vibration. In this paper, the linearized stability lobes theory allows us to determine critical and optimal cutting conditions for which vibration is not appar- ent in the milling of thin-walled workpieces. The evolution of the mechanical parameters of the cut- ting tool, machine tool and workpiece during the milling operation are not taken into account. The critical and optimal cutting conditions depend on dynamic properties of the workpiece. It is illustrated how the stability lobes theory is used to evaluate the variation of the dynamic properties of the thin- walled workpiece. We use both modal measurement and finite element method to establish a 3D rep- resentation of stability lobes. The 3D representation allows us to identify spindle speed values at which the variation of spindle speed is initiated to improve the surface finish of the workpiece.

Mots clés: Thin wall machining; Chatter; 3D stability lobes; Modal vibrations; Variable spindle speed

Domaines: Vibrations [physics.class-ph]; Vibrations [physics.class-ph]

Vincent Thévenot, Lionel Arnaud, Gilles Dessein, Gilles Cazenave-Larroche. Influence of material removal on the dynamic behavior of thin-walled structures in peripheral milling. Machining Science and Technology, 2006, vol. 10, pp. 275-287. ⟨10.1080/10910340600902082⟩. ⟨hal-00840332⟩