DEEP DRILLING MACHINE TOOL Russian patent published in 2010 - IPC B23B41/02 B23B51/06 

FIELD: machine building.

SUBSTANCE: proposed machine tool comprises hollow bring bar with its inner part making a chip disposal channel and tubular boring head secured to bar far end, boring head outlet holes being communicated with said chip disposal channel on cutting plate side. Note here that there is a gap arranged between boring bar outer surface and drilled bore inner surface to feed coolant from outside to cutting plate side. Note also that said outlet holes serve to let chips outward together with coolant. Note also that there are bypass holes made all along boring head peripheral wall arranged inclined so that outer hole is located nearer to head far end side than inner hole. Besides said bypass holes communicate with aforesaid coolant gap via annular clearance between boring head outer surface and inner surface of boring bar end part, intended for passage of a part of coolant fed from outside to drilling side, from bypass holes via annular gap into boring head to generate rarefaction on outlet side and accelerate chip disposal.

EFFECT: higher efficiency of drilling.

2 cl, 5 dwg