Drill
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United States of America Patent
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Mar 28, 2017
Grant Date -
Nov 12, 2015
app pub date -
Jan 29, 2013
filing date -
Jan 29, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A drill with a cutting fluid supply hole includes: a tool main-body with an axial end cutting-edge, a portion having a discharge flute on a main-body distal end side portion, and a cutting fluid supply hole, the hole having a fan-shaped cross section defined by a front inner-wall surface located along a main-body radial direction on the front side in the drill rotation direction, a rear inner-wall surface located along the radial-direction on the rear side in the drill rotation direction and facing the front inner-wall surface in a main-body circumferential direction, an outer circumferential inner-wall surface made up of a partially cylindrical surface around a drill center line, and an inner circumferential inner-wall surface made up of a partially cylindrical surface around the center line with a curvature radius smaller than that of the outer circumferential inner-wall surface and facing the outer circumferential inner-wall surface in the radial direction.
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