PART HOLDER FOR PARTS TO BE MACHINED WITH MACHINE TOOLS, PARTICULARLY FOR PARTS HAVING A LARGE MASS TO BE MACHINED IN VERTICAL LATHES

摘要

A part holder (10) for parts to be machined with machine tools, particularly for parts having a large mass to be machined in vertical lathes, which comprises: a worktable (11) for supporting a part (12), a footing (13) for supporting the worktable (11), at least one hydrostatic supporting bearing (14) for supporting the worktable (11) on the footing (13), at least one preloading bearing (15), which is interposed between the worktable (11) and the footing (13), in a dynamic parallel configuration with respect to the supporting bearing (14), means (16) for modulating a preloading imparted to the supporting bearing (14), means (17) for sensing at least one functional parameter (A) of at least one chosen supporting slider (14a) of the supporting bearing (14), and a central unit (18) for controlling the modulation means (16). The control unit (18) is functionally connected to the sensing means (17) so as to receive from them estimates of the functional parameter (A), and to the modulation means (16) so as to drive them as a function of these estimates.