Drill insert with controlled contact clearance

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

B - Operations, Transporting

23

B

B23B 27/02 (2006.01) B23B 27/00 (2006.01) B23B 51/00 (2006.01)

Patent

CA 2520715

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.

L'invention concerne une plaquette pour outil de coupe présentant un dégagement de contact contrôlé derrière l'arête de coupe qui limite l'usure frontale et permet la circulation d'une plus grande quantité de fluide de refroidissement à proximité de l'arête de coupe, ce qui permet également une augmentation de la vitesse périphérique, des vitesses d'avance et de la durée de vie de l'outil. La surface de dégagement de contact contrôlé constitue une première zone d'usure et une seconde zone d'usure. La première zone d'usure générée lors du fonctionnement de la plaquette d'alésage permet une augmentation de la distance d'usure frontale de zéro à la distance entre l'arête de coupe et la surface de dégagement de contact contrôlé. La seconde zone d'usure maintient la distance d'usure frontale sensiblement constante, jusqu'à ce que la surface de dégagement de contact contrôlé soit sensiblement usée.

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