US 5,314,273 AGranted

Cutting tool

AssigneeMitsubishi Materials Corporation

InventorsMasaaki Nakayama, Masayuki Okawa, Junichi Saito

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Abstract

The present invention relates to a cutting tool, especially the cutting tool having a head segment releasably attached to a shank segment. According to one aspect of this invention there is provided a cutting tool comprising: (i) a head segment rotatable around an axis thereof and a forward end portion having at least one cutting-insert receiving seat and a rearward end portion; (ii) a shank segment rotatable around an axis thereof having a forward end portion adapted to be coaxially joined with the rearward end of the head segment and a rearward end portion adapted to be fixedly secured to a machine spindle; (iii) an engaging hole coaxially formed on one of the above segments, which is provided with at least two internal threads communicating between the hole and the external surroundings through a peripheral surface of the segment; (iv) an engaging projection coaxially formed on other one of the segments and engagingly fitted into the hole; and (v) clamp screws respectively threaded through each internal thread, in which bottom ends of the clamp screws are contacted with a surface of the engaging projection.

Claims5

Dependent claims

A cutting tool comprising:

a head segment rotatable around an axis thereof, said head segment including a forward end portion having at least one cutting-insert receiving seat and a rear end portion;
a shank segment rotatable around an axis thereof having a forward end portion adapted to be coaxially joined with said forward end of the head segment and a rearward end portion adapted to be fixedly secured to a machine spindle;
an engaging tapered hole coaxially formed on one of said segments;
an engaging tapered portion in the form of a general conical frustum coaxially formed on the other one of said segments and engagingly fitted into said hole;
at least one internal thread communicating between said hole and the external surroundings through a peripheral surface of said head segment;
at least one clamp screw respectively threaded through said at least one internal thread, a bottom end of said clamp screw being in contact with a surface of said engaging tapered portion;
said engaging tapered portion further including a chamfered flat portion on an outer peripheral surface thereof for receiving said bottom end of the clamp screw;
said clamp screw being inclined in an axial direction of the head segment at an angle .alpha. of more than 90.degree., while a surface of said chamfered flat portion is perpendicular to an axis of said clamp screw and is inclined to the axial direction of the head segment at an angle of .alpha. minus 90.degree..

5 more elements

Dependencies are inferred from the claim text.