Patent ID: 6642470
Filing Date: 2003-11-04
Classification: B23H

Abstract:
Process to machine a three-dimensional piece (14) by milling with an electroerosion device, according to whichan electrode-tool (31) of cylindrical shape whose diameter (2R) is small relative to the dimensions of the surfaces to be eroded, is driven in rotation, the three-dimensional relative movement (x, y, z) between the electrode-tool (31) and said piece (14) is controlled by means of a digital control unit (CN), there are recorded by computer means (MI) the shapes to be machined in the form of a superposition of virtual layers (33), a path of an electrode-tool (31) is simulated, such that this latter sweeps groove by groove, successively, each of the virtual layers, and the corresponding control signals are transmitted toward the digital control unit (CN) to carry out machining layerwise, by regulation means (MR), the longitudinal wear of the electrode-tool along its trajectory is simulated and corresponding compensation signals are transmitted to the digital control unit (CN) so as to compensate this longitudinal wear and to maintain the movement of the end of the electrode-tool parallel to said layers (33), characterized by the fact that, there are provided several values for longitudinal wear of the electrode-tool (1) according to the mutual geometric configuration between the electrode-tool (31) and the nearby material of said piece (14), that values of compensation signals corresponding to each of these values are transmitted to the digital control unit (CN), and that said values take account of the geometric configuration of the flow between the electrode-tool (31) and the nearby material, of a machining liquid used for machining.