Invention Grant
US07896588B2 Short-hole drill and a drill body therefor 有权
短孔钻头和钻体

Short-hole drill and a drill body therefor
Abstract:
A short-hole drill, including a drill body being rotatable about a center axis and having a rotationally symmetrical envelope surface, one or more replaceable cutting inserts mounted in pockets in a front end of the drill body, one or more outwardly open flutes being countersunk in the envelope surface and extending rearwardly from the front end of the drill body to evacuate chips from the cutting inserts, and a number of replaceable first support pads being mounted in countersunk seats proximate the front end of the drill body to support and guide the drill against a hole wall generated by the cutting inserts. A number of second support pads are mounted in countersunk seats that are axially spaced apart from the first support pads by an envelope surface portion having a predetermined axial extension to support and guide the drill when the first support pads leave the hole wall.
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