Kennametal Inc.

Peter Sollfrank

Juergen Schwaegerl

Tim Guter

Herbert Rudolf Kauper

Berthold Heinrich Zeug

Julia Tempelmeier

Rainer Buettner

Alexander Schmitt

The invention relates to a rotary tool, in particular a drill (), which extends along a longitudinal axis (), having an end face (); a center (); at least two main cutting edges (), each of which extends from the center () outwards towards a cutting corner (); a flute () associated with each main cutting edge (), a flank on the end face (), associated with each main cutting edge (); a rake angle (&#x3b3;) between the respective main cutting edge () and the flute (); a ground face () which forms a point thinning () in the area of the center (), extends into a radially outer area and defines the rake angle (&#x3b3;) in the area of the main cutting edge (). The rotary tool is characterized in that the rake angle (&#x3b3;) formed by the ground face () is constant along the main cutting edge (), and the flank () of the other main cutting edge () is formed by the ground face (). An advantageous, excellent cutting behavior is thereby achieved along the main cutting edge (). The invention further relates to a method for manufacturing the rotary tool, which is then especially simple to produce.

Rotary tool and method for manufacturing a rotary tool

A method for manufacturing a drill bit (), wherein in a first step the chip flutes () are ground into a round rod, in a second step the round rod is ground down to its outer diameter () with simultaneous grinding of the drill-bit back (), and wherein in a third step the drill-bit front () is ground, and a drill bit () having at least one chip flute () and one secondary cutting edge and one drill-bit back () adjoining the secondary cutting edge, the drill-bit back () sloping downwards as the distance from the secondary cutting edge increases, in order to create a clearance that becomes continuously larger as the distance from the point of intersection () of the secondary cutting edge with the drill-bit back () increases.

Drill bit and method for manufacturing

Wrench for modular drilling tools

Growing community of inventors

Waldthum, Germany

Peter Sollfrank