Drill insert with controlled contact clearance

Details Drill insert with controlled contact clearance Drill insert with controlled contact clearance

2005-06-07

2005-06-07

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

C408S227000, C408S713000

Reexamination Certificate

active

06902359

ABSTRACT:
A cutting tool insert having a controlled contact clearance behind the cutting edge which limits flank wear and allows more coolant near the cutting edge further allowing an increase in surface speed, feed rates, and tool life. The controlled contact clearance surface provides a first wear zone and a second wear zone, the first wear zone generated during operation of the drill insert allows the flank wear distance to grow from zero to the distance from the cutting edge to the controlled contact clearance surface, the second wear zone keeps the flank wear distance substantially constant until the controlled contact clearance surface is substantially worn away.

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patent: 2002/0098050 (2002-07-01), Heule
patent: 2004/0001741 (2004-01-01), Mast et al.
patent: 2004/0223823 (2004-11-01), Mast et al.

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