Patent · US Active

Twist drill for metal machining

US9844819B2 · kind B2 · utility

0Cited by

5References

19Claims

0Family size

Assignee

Seco Tools AB · SE

Inventors

Anders Bjork · Tumba, SE
Par Nordberg · Sand Springs Road, SE
Christian Carlsson · Åmål, SE

Key dates

Filing date	Jun 9, 2014
Grant date	Dec 19, 2017
Priority date	—
Expiry date	Jun 9, 2034

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/9097
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A long twist drill includes a shank and a drill body having a drill tip (16). 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°. 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.