US 2006/0039766 A1Published application

Gun drill

AssigneeIscar, Ltd.

InventorGil Hecht

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Abstract

A gun-drill comprises a cutting-head detachably secured to a shank, having a common longitudinal axis and comprising mating peripheral surfaces. A shank coupling portion comprises a forwardly tapering shank fixation surface is formed at a front end of the shank, and a cutting-head coupling portion comprising a forwardly tapering cutting-head fixation surface is formed at a rear end of the cutting-head. Both the shank and the cutting-head coupling portion extend over a peripheral coupling angle φ of more than 180°. The shank and the cutting-head are assembled by positioning the cutting-head leading face in front of the shank trailing face, slidably inserting the cutting-head coupling portion into the shank coupling portion laterally to the axis of rotation A and rotating the cutting-head relative to the shank in a direction opposed to the direction of rotation R so that the cutting-head coupling portion and the shank coupling portion interlock co-axially.

Claims27

Dependent claims

A gun-drill having a longitudinal axis of rotation A defining a front-to-rear direction and a direction of rotation R, and comprising a cutting-head detachably secured to a shank;

the cutting-head comprising a cutting portion adjacent a cutting-head forward end and a cutting-head coupling portion adjacent a cutting-head rear end, the cutting-head coupling portion comprising an axially rearwardly facing cutting-head support surface and a generally frustoconical cutting-head fixation surface tapering radially inwardly while extending forwardly towards the cutting-head cutting portion;
the shank comprising a shank coupling portion formed at a shank forward end, the shank coupling portion comprising an axially forwardly facing shank support surface and a generally frustoconical shank fixation surface tapering radially inwardly while extending forwardly towards the shank forward end;
wherein
the cutting-head fixation surface extends peripherally continuously from a cutting-head flute leading face to a cutting-head flute trailing face over a cutting-head peripheral angle φc greater than 180°;
and
the shank fixation surface extends peripherally continuously from a shank flute leading face to a shank flute trailing face over a shank peripheral angle φs greater than 180°;
in a secured position, the cutting-head coupling portion and the shank coupling portion interlock co-axially, with the cutting-head support surface abutting the shank support surface;
and
cutting-head and shank peripheral surfaces and cutting-head and shank flute leading and trailing faces mate and are co-aligned.

6 more elements

A method of assembling a gun-drill comprising a cutting-head and a shank, the gun-drill having a longitudinal axis of rotation A extending centrally therealong and defining a front-to-rear direction and a direction of rotation R, and comprising cutting-head and shank peripheral surfaces and cutting-head and shank flute leading and trailing faces;

the shank comprises a shank coupling portion formed at a shank front end and comprising a forwardly tapering shank fixation surface and a shank cylindrical surface extending rearwardly thereof and an axially forwardly facing shank support surface, the shank fixation surface and the shank cylindrical surface extending peripherally continuously from a shank leading face to a shank trailing face along an angle φs greater than 180°;
the cutting-head having a cutting portion adjacent a cutting-head forward end and a cutting-head coupling portion adjacent a cutting-head rear end, the cutting-head coupling portion comprising a forwardly tapering cutting-head fixation surface, a cutting-head cylindrical surface extending rearwardly thereof, and a rearwardly facing cutting-head support surface, the cutting-head fixation surface and the cutting-head cylindrical surface extending peripherally continuously from a cutting-head leading face to a cutting-head trailing face along an angle φc greater than 180°;
the method comprising the steps of:
positioning the cutting-head and the shank with the cutting-head leading face facing the shank trailing face;
slidably inserting the cutting-head coupling portion into the shank coupling portion until a contact is formed between the cutting-head fixation surface and the shank fixation surface;
and
rotating the cutting-head relative to the shank in a direction opposed to the direction of rotation R until the cutting-head fixation surface abuts the shank fixation surface and cutting-head and shank peripheral surfaces and cutting-head and shank flute leading and trailing faces co-align.

4 more elements

Dependencies are inferred from the claim text.