Sandvik Intellectual Property Ab

Hakan Carlberg

Rasmus Hemph

Fritz Alum Yah

A drill body and a drill are disclosed. The drill body has a rotational axis and comprises a central chip flute extending along a periphery of the drill body. A central chip flute cross-section has a centre line extending in a plane extending perpendicularly to the rotational axis, and through the rotational axis. The central chip flute cross-section has a depth, as seen along the centre line, and a width as seen perpendicularly to the centre line. The central chip flute cross-section has a maximum depth Dp within a range of Dp=0.75&#xd7;D/2 to Dp=0.90&#xd7;D/2, and a maximum width W within a range of W=0.75&#xd7;D/2 to W=0.90&#xd7;D/2, and wherein the maximum width W extends symmetrically about the centre line.

Drill body and drill

A metal cutting drill insert for a drill tool having a chip disruptor provided at a rake face. The chip disruptor is further configured with a chamfer at a leading cutting edge region to increase cutting resistance and facilitate chip breakage.

Drill insert

A drill body and a drill are disclosed. The drill body has a rotational axis and includes a peripheral chip flute extending along a periphery of the drill body. A peripheral chip flute cross-section has a centre line extending in a plane extending perpendicularly to the rotational axis, and through the rotational axis. The peripheral chip flute cross-section has a radially inner side extending perpendicularly to the centre line, and first and second lateral sides connecting to the radially inner side. The radially inner side has a length L1 within a range of L1=0.95&#xd7;D/4 to L1=1.2&#xd7;D/4. Each of the first and second lateral sides has a length LS1, LS2 within a range of D/4 to 1.3&#xd7;D/4. The first and second lateral sides diverge from each other in a direction radially outwards from the radially inner side.

Growing community of inventors

Sandviken, Sweden

Hakan Carlberg