Damage resistant drill

Cutting by use of rotating axially moving tool – Processes – Bit detachable

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Details

408227, 408230, B23B 3500

Patent

active

058460357

ABSTRACT:
A drill according to an exemplary embodiment of the invention comprises a shank from which the drill is driven; a body connected to the shank, the body having a surface; a flute in the body; a cutting edge at a drill point; and a peripheral relief surface which extends outwardly from the surface of the body to an outer circumference of the drill, wherein the peripheral relief surface, for a cross section of the drill perpendicular to a drill axis, intersects the outer circumference at a peripheral point at an edge of the flute. The drill has an improved capacity to withstand a loss of coolant during drilling without severe overheating of the drill or workpiece and with little damage to the drill and workpiece.

REFERENCES:
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E.J.A. Armarego et al., Predictive Force Models for Point-Thinned and Circular Centre Edge Twist Drill Designs, 45 Annals of the CIRP 65-70 (1996).
G. Spur and J.R. Masuha, Drilling With Twist Drills of Different Cross Section Profiles, 30 Annals of the CIRP 31-35 (1981).
Tetsutaro Hoshi et al. Study of High Performance Drill Geometry, 38 Annals of the CIRP 87-90 (1989).
E.J.A. Armarego et al., Four Plane Facet Point Drills--Basic Design and Cutting Model Predictions, 39 Annals of the CIRP 41-45 (1990).
A. Bhattacharyya et al., Chisel-Edge Modification of Small HSS and Carbide Drills for Improved Machinability, 30 Annals of the CIRP 21-25 (1981).
M.F. DeVries et al., An Investigation of the Cutting Mechanisms of the New Point Drill, 37 Annals of the CIRP 73-78 (1988).

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