Patent ID: 9089908
Filing Date: 2015-07-28
Classification: B23C,B23D,Y10T

Abstract:
1. A tip-replaceable cutting tool comprising: an insert attachment seat for removably attaching a cutting insert; and a cutting insert installed in the insert attachment seat and having an operative cutting edge, the cutting insert having an upper face, a lower face and a plurality of peripheral faces extending between the upper and lower faces, wherein said insert attachment seat has a substantially flat bottom face, a female screw hole into which a fastening screw is threaded for attaching the cutting insert, and first and second restraint wall faces which rise upward from said bottom face and are not in parallel with each other, the second restraint wall face being between the operative cutting edge and the first restraint wall face, in a screwing rotational direction of the fastening screw, a first angle between the first and second restraint wall faces is smaller than a second angle between two peripheral faces of the cutting insert respectively facing the first and second restraint wall faces, as viewed from a side opposing the bottom face, the lower face of said cutting insert contacts said bottom face and said two peripheral faces of the cutting insert contact said first and second restraint wall faces, a first of said two peripheral faces of the cutting insert makes line contact with said first restraint wall face in an extending direction of said first restraint wall face, and a second of said two peripheral faces is inclined relative to an extending direction of said second restraint wall face, and contacts said second restraint wall face at an end portion of said second restraint wall face.