Seco Tools Ab

Anders Björk

Johnny Bruhn

Mattias Puide

Mattias Svensson

Jimmy Karlsson

Mikael Grönkvist

Christian Carlsson

Par Nordberg

Mikael Grönqvist

Pär Nordberg

A long twist drill includes a shank and a drill body having a drill tip (). The twist drill has a length L and an outer diameter D, and has a cemented carbide or high speed steel substrate and a coating of at least one layer. The quota L/D is at least 16. The twist drill has two cutting segments at the tip and two flutes chip. The twist drill is provided with holes for fluid opening in the tip. The twist drill has an axial web thinning angle GAA, which is 40 to 50&#xb0;. The twist drill further has a web that back tapers such that a web diameter gets smaller in a direction away from the tip towards the shank within an axial distance.

Twist drill for metal machining

The present invention relates to a tool as well as a blank for manufacturing of the tool. The tool is made of solid cemented carbide and includes a shank for mounting in a rotatable spindle and chip flutes. Lines of intersection between the chip flutes and clearance surfaces form cutting edges at a cutting end of the tool. The flush channels extend through the entire tool in order to transfer flushing medium to the cutting end of the tool. The flush channels have varying pitch.

Rotatable tool and a blank

Growing community of inventors

Söderköping, Sweden

Anders Björk