| 摘要 |
The invention relates to an indexable milling insert ( 3 ) having a polygonal basic shape, comprising four peripheral sides, which meet each other in pairs in one the one hand two acute corners ( 15 ), and on the other hand two obtuse corners ( 16 ). Between chip surfaces ( 17 ) on the top side of the insert and flank surfaces ( 18 ) along the peripheral sides, cutting edges ( 19 ) are formed, which individually comprise on the hand a major edge portion ( 20 ), and, on the other hand, a rounded minor edge portion ( 21 ), formed in connection with an acute corner ( 15 ). Characteristic of the invention is the combination that the individual major edge portion ( 20 ) is slightly arched and that at least one connecting surface ( 4 ) is formed in the bottom side of the insert, of the type that comprises a plurality of parallel ridges spaced-apart by grooves having a cross-section-wise tapering shape and which are intended to co-operate with an analogous connecting surface adjacent to a chip channel in a cutting-insert-carrying milling head. |
