公开(公告)号：EP0912281A1

公开(公告)日：1999-05-06

申请号：EP97933953.0

申请日：1997-07-10

申请人： Sandvik Aktiebolag (publ)

发明人： GYLLENGAHM, Stefan

IPC分类号： B23B27

CPC分类号： B23B27/1614 ,  B23B2200/048 ,  B23B2205/12 ,  B23B2205/16

摘要： An indexable cutting insert (3) for cutting metal machining has substantially the shape of a star. This makes possible a large number of cutting edges per insert and, thereby, a very good cutting economy. E.g., for an eight-pointed, double-sided cutting insert there are sixteen cutting edges.

公开(公告)号：EP0439317A3

公开(公告)日：1992-03-04

申请号：EP91300457.8

申请日：1991-01-21

申请人： Little, Roger Warren

发明人： Little, Roger Warren

IPC分类号： B23B27/06

CPC分类号： B23G5/18 ,  B23B27/065 ,  B23B27/1625 ,  B23B2200/048 ,  B23B2205/12

摘要： A threading insert is provided of a type that includes a mount portion and a plurality of arms radiating therefrom that each forms a pair of cutting edges, which is rugged, facilitates accurate positioning of the insert on the tool holder, encourages reliable breaking of cutting chips, and enables internal threading in a small diameter hole. One insert includes four arms (34-40, Fig. 3) radiating from a mount portion (24), with each arm having a radially outer edge (52) and a pair of opposite sides (54, 56), and forming a cutting edge (58, 60) at the interception of each side with an end of the outer edge. The mount portion has four flat locating surfaces (42-48) lying at the sides of an imaginary square, with each locating surface lying between a pair of arms and with there being an obtuse angle (D) between each locating surface and an adjacent side of an arm. The side of each arm extends only a short radial distance before intersecting a flat locating surface, which results in rapid breaking of chips and there being a considerable distance between a central hole in the insert and each locating surface to avoid insert breakage. Each arm outer edge subtends an angle of no more than about 30°.