METHOD OF MECHANICAL PROCESSING FOR DEEP HOLE IN TUBULAR BILLET Russian patent published in 2015 - IPC B23B41/00 B23D79/00 B23B1/00 B23C3/00 

FIELD: machine building.

SUBSTANCE: processing is carried out by a device comprising a boring bar with cutting tools which is installed at eccentric bearings in a poppet sleeve with cutting and mandrelling teeth while the said sleeve is aligned in the initial position in an input steady rest before a working medium is supplied. The billet being processed is clamped between inner end faces of the input and output steady rests coaxially to them. Prior to the start of processing, centring chamfers are made on the inner end faces of the steady rests, mating chamfers are made on the end faces of the tubular billet, the chamfers are matched and sealed. Plugs are mounted on outer end faces of the input and output steady rests to provide for a common sealed cavity. The orking medium is supplied to the input steady rest via throttles during the direct working stroke, herewith rotary and translatory motion of the boring bar is combined with its planetary motion around the axis of the poppet sleeve. During the back stroke, the working medium is supplied to the output steady rest.

EFFECT: improved precision and quality of the processed surface, reliability of the processing procedure due to better chip removal.

2 cl, 2 dwg