Kennametal Inc.

Robert L Shomaker

Scott W Vogel

William E Smith

An insert for use in a ball nose end mill is provided that includes an insert body having a top wall, a bottom wall, and at least one arcuate side wall. An arcuate cutting edge is defined at an intersection between the top and side walls that includes a plurality of sinusoidal undulations for reducing cutting forces, and vibration, and enhancing the breaking and removal of chips removed from a workpiece during a cutting operation. An end portion of the insert crosses the axis of rotation when the insert is mounted in the seat of an end mill body, and the undulations reduce the considerable shear forces applied to the cutting edge at this location. The cutting edge has a profile which follows the contour of a sphere to permit machining a rounded cut. The side wall of the insert body includes an upper relief portion disposed directly under the cutting edge, with a relief angle for preventing the undulations from making unwanted striations or tool marks in the sidewalls of the rounded cut.

Insert for ball nose end mill

Insert having sinusoidal undulations for ball nose end mill

A milling cutter for cutting a workpiece in both right and left-handed rotary directions is provided that comprises a rotatable cutter body having at least one pair of right and left-handed insert seats disposed on its periphery, an indexable wedge for each pair of right and left-handed insert seats, and a mounting screw for each of the wedges for securing the wedges in a clamping position with respect to a right or left-handed insert seat. Each of the wedges may be used to secure an insert in the right or left-handed seat of its respective seat pair by loosening or removing the mounting screw, and turning the wedge 180.degree.. Each wedge includes a front end for wedgingly engaging an insert in either the right or left-handed seat, and a back end for wedgingly engaging an opposite surface of the unused insert seat in order to more securely clamp the insert in place. The back end of each wedge includes an offset portion that is receivable in and semi-complementary in shape to the unused insert seat for still more stability.

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Little Rock, AR, United States of America

Robert L Shomaker