Ellipse vibration cutting auxiliary device based on three-piezoelectric driving

The invention discloses an ellipse vibration cutting auxiliary device based on three-piezoelectric driving; the ellipse vibration cutting auxiliary device comprises a support mechanism, a flexible guide mechanism and a driving mechanism; the flexible guide mechanism and the driving mechanism are fixed on the support mechanism; the driving mechanism drives the flexible guide mechanism in a point-contact mode, so the flexible guide mechanism can make reciprocating motions in an x direction and ellipse locus motions in y and z planes. The ellipse vibration cutting auxiliary device uses a composite double-parallel four-rod mechanism in a horizontal direction, so displacement in the horizontal direction can be greatly improved, and stress on a flexible hinge in horizontal direction motions can be greatly reduced, thus improving mechanism life. The combined flexible hinge with two cascade ends and a composite center is employed in the y and z planes so as to match with two parallel piezoelectric, thus realizing high frequency motions under low coupling operation; the ellipse vibration cutting auxiliary device uses flexible guide unit integration so as to reduce tradition assembling errors.