PART HOLDER PARTICULARLY FOR PARTS HAVING A LARGE MASS TO BE MACHINED IN MACHINE TOOLS SUCH AS VERTICAL LATHES AND THE LIKE

摘要

A part holder (10), particularly for parts having a large mass to be machined in machine tools such as vertical lathes and the like, which comprises - a worktable (11) for supporting a part (12) to be machined, - a footing (13) for supporting the worktable (11), - at least one axial bearing (14) which is adapted to support the worktable (11) on the footing (13), - at least one radial bearing (15), provided with hydrostatic radial sliders, which is adapted for the guided coupling of the worktable (11) with the footing (13) so as to allow rotation about a rotation axis (A) of the worktable (11) on the footing (13), the rotation axis (A) being formed by the axis of the radial bearing (15), - first sensing means (16), which are functionally connected to at least one chosen radial slider (17) of the radial bearing (15) and are adapted to detect at least one functional parameter, which indicates the operation of the chosen radial slider ( 17), - a central processing unit (18), which is functionally connected to the first sensing means (16) in order to receive from them estimates of the functional parameter. The central processing unit (18) comprises means (19) for estimating the eccentricity of the centre of gravity axis (B) of a part (12) arranged on the worktable (11) with respect to the rotation axis (A), the estimation means (19) being adapted to process the values of the functional parameter detected by the sensing means (16), so as to obtain the value of the eccentricity (E).