Design of a passive mechanism for machining purpose.

摘要

This thesis presents a method of machining double curvature panels used in aeronautic industries. Normally, the machining of such panels is performed by chemical methods, yet given that chemical methods generate environmental problems, aeronautic industries have preferred the use of mechanical methods. During recent years, several mechanical methods have been proposed. Some of these methods use two devices which work synchronously; one is used to perform the machining, while the other is used as a support at the opposite side of the machining surface. This is known as the mince milling method or mirror milling.;This thesis proposes a compliant mechanism system allowing to machine aeronautic panels without requiring support at the opposite side of the surface. This mechanical system uses a 3-PSP topology with the cutting tool at its center. A compliant system is used for the orientation of the tool to maintain it normal to the surface to be machined.;The machining device is connected to the cutting surface by three sliding pads. The pads provide contact surfaces around the cutting tool to support the machining zone without requiring any support from the opposite side.