Title:
ラミネートをドリル加工するためのドリル
Document Type and Number:
Japanese Patent JP6684819
Kind Code:
B2
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.
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Inventors:
Roth, Etvin
Application Number:
JP2017549419A
Publication Date:
April 22, 2020
Filing Date:
December 22, 2015
Export Citation:
Assignee:
Walter AG
International Classes:
B23B51/00; B26F1/16
Domestic Patent References:
| JP11170106A | ||||
| JP2010517799A | ||||
| JP11058117A | ||||
| JP2005052939A |
Foreign References:
| US20080193234 | ||||
| US1418485 | ||||
| US1000067 | ||||
| DE20211589U1 |
Attorney, Agent or Firm:
Sonoda/Kobayashi Patent Business Corporation