Combined precision boring and burnishing tool

摘要

A combined tool for precision boring and burnishing the internal surfaces of workpieces comprises a bore head arrangement, a burnishing head arrangement rearwardly of the bore head arrangement and a feed tube arrangement connected to the burnishing head arrangement for axially advancing the latter and the bore head arrangement into a rotating workpiece for finishing the internal surface thereof while a stream of flushing oil under pressure is fed about the tool for removing chips shaved off by the bore head arrangement. The bore head arrangement is provided with a plurality of circumferentially displaced oil pockets which are supplied with oil under pressure for hydrostatically supporting and guiding the bore head arrangement during its advance. The three mentioned arrangements are connected to each other for simultaneous advance into the workpiece while being prevented from rotating relative to each other and the connectors preferably include a coupling arrangement between at least two of the three first-mentioned arrangements for transmitting a moment from one to the other of the two arrangements by permitting limit deviation of the axes thereof.