Drill bit for drilling laminates

US10183343B2 · kind B2 · utility

Assignee

• WALTER AG · DE

Inventor

• Edwin Roth · Oberharmersbach, DE

Key dates

• Filing date: Dec 22, 2015
• Grant date: Jan 22, 2019
• Expiry date: Dec 22, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/899
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A drill bit for drilling laminates includes at least two main chip flutes separated by corresponding webs. The free end faces of the webs form relief surfaces. At least one secondary flute, which is formed in the periphery of each of the webs divides the web into a main and a secondary web. A main cutting edge is formed by the intersection of a main chip flute and a relief surface on the main web. A secondary cutting edge is formed by the intersection of the secondary flute with a relief surface on the secondary web following the main cutting edge in the direction of operation, the main cutting edges extending to the nominal radius of the drill. The secondary cutting edges terminate at a distance before the nominal radius and axially project from the main cutting edge by an axial overhang at least along their radially outer section.