Cutting insert with chip control

Cutters – for shaping – Including tool having plural alternatively usable cutting edges – With integral chip breaker – guide or deflector

Reexamination Certificate

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Details

C407S115000, C407S116000

Reexamination Certificate

active

06186705

ABSTRACT:

FIELD OF THE INVENTION
The invention disclosed and claimed relates generally to index able hard metal cutting inserts for ductile metals. In particular, it concerns the configuration of the rake face of the insert to cut a chip from a workpiece of ductile material in a manner such as to cause the curling chip to break off in a short curl over a practical working range of feed rates, i.e., chips both thin and thick, to facilitate their ready removal from the cutting site.
BACKGROUND OF THE INVENTION
In general, the interruption of the rake face of cutting inserts with laterally spaced depressions in the chip path from the cutting edge has been appreciated for its ability to render chips removed from ductile work material more readily breakable. The effect of properly placed depressions is to produce longitudinal ridges in the chip while it remains in a somewhat plastic state due to the high temperature produced by the velocity of the forceable shearing of the chip from the workpiece. The ridges, in turn, stiffen the chip against bending and hasten the attainment of a sufficiently high level of bending stress or strain at a point in the chip remote from the cutting site to cause it to break off.
The effect varies with the flow properties of the material, and with the cutting speed and feed rate, which influence the strain rate and heat generated in the chip as well as determining its thickness.
The object of this invention is the provision of an insert, suitable for use in drills and other applications, that will break chips of ductile materials into short lengths over a practical working range of feed rates and chip thicknesses.
SUMMARY OF THE INVENTION
The cutting insert of the invention provides a rake surface of positive inclination when mounted in a drill body. The rake surface recedes from the cutting edge to a sloped ledge of significant height, while the rake surface proper between the cutting edge and the ledge is interrupted by a series of spaced depressions along and adjacent to the cutting edge in the path of chip flow. The depressions serve to corrugate and curl a chip thin enough to follow their contour as it emerges from the cutting edge, while the ledge behind them serves to curl thicker chips which are stiff enough to override the depressions.


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