Abstract: An indexable end mill according to the invention includes an end mill body with a round distal end portion and an indexable insert mounted to the end mill body as protruded from the round distal end portion thereof, the indexable insert formed with an end face by cutting away its end portion at a rotation center of cutting edges of the indexable insert, the end face having an edge closer to the end mill body extended outwardly from the rotation center as inclined rearwardly with respect to a line L orthogonal to an axis of the end mill body.

Abstract: A sintered hard material according to the invention comprises 0.02 to 0.10 wt % of one or more metals selected from the group consisting of Fe, Co and Ni, 0.3 to 3.0 wt % of one or more compounds selected from the group consisting of carbides, nitrides and carbonitrides of transition metals of the IVa, Va and VIa groups of the periodic table and a residue of tungsten carbide component having an average particle size of 0.5 .mu.m or less, the tungsten carbide component containing WC and W.sub.2 C in a proportion W.sub.2 C/(WC+W.sub.2 C) of between 0.01 and 0.15, the W.sub.2 C in the tungsten carbide component having a lattice constant reduced by 0.3 to 1.5 %.

Abstract: A indexable end mill of the present invention comprises a helical flute formed in the outer periphery of a shank as inclined at a required angle with respect to the axis of the shank, a plurality of indexable inserts attached to places in the helical flute rearwardly with respect to the axis of the rotated shank as spaced at required intervals along the helical flute, and recesses defined in the outer periphery of the shank as interposed between the indexable inserts.

Abstract: A milling cutter blade with a notched cutting edge capable of being mounted at a desired negative or positive rake in a cutter body, the notches having side walls which, at the side face, diverge away from the cutting edge. The blade edge surfaces adjacent the cutting edges are of concave, generally V-shaped configuration with the junctures of these edge surfaces with the side faces being at an acute angle. A plurality of the blades are mounted in a cutter body to form a milling cutter assembly such that one portion of the configurated concavity V on the blade back edge surface is in reference engagement with a like oriented cutter body reference surface on a convex generally V-shaped back surface of a cutter body blade slot. The V-shaped concavity on the front edge surface of the blade cooperates with the adjacent chip pocket of the cutter body to discharge chips.

Abstract: A milling cutter having blades retained against seating surfaces in cutter body slots by resilient leaf springs engaging the blade edge surface that is opposite the seating surface for the blade. The seating surfaces are each part of a tapered wedge element and a threaded adjuster extending through the wedge element into the cutter body, parallel to the wedge seating surface.

Abstract: An end milling tool has a main body formed at its front end with a long main cutting end edge extending generally radially from the outer periphery of the main body approximately to the center of the main body and with a short auxiliary cutting end edge extending from a different location on the outer periphery generally radially inwardly to a position spaced from the center. An outer peripheral cutting edge is formed at an outer peripheral portion of the main body and is continuous with each of the main and auxiliary cutting edges. The main cutting end edge projects axially of the main body beyond the auxiliary cutting end edge to prevent the auxiliary cutting end edge from breaking or chipping.

Abstract: Cemented carbide material consists essentially of 70 to 90% by weight of tungsten carbide or of a mixture of tungsten and carbide at least one transition metal carbide, the transition metal being one other than tungsten selected from Groups IV to VI of the Periodic Table and 10 to 30% by weight of a binder. The binder contains 20 to 90% by weight of nickel, 10 to 80% by weight of cobalt and 5 to 25% by weight of chromium as the base ingredients thereof. The cemented carbide material has improved resistance to oxidation, to wear and especially to thermal cracking and is therefore suitable for rolls, guide rollers and dies for plastic hot working.