Indexable insert

摘要

The present invention provides an indexable insert (10) which can pare away the chip stably without increase of cutting resistance. With this insert, serrations are formed by arranging a plurality of groove portions and ridge portions alternatingly upon side ridge edge portions of the upper surface (12), with the exception of sloping surfaces (12A) which are formed at both end portions in the longitudinal directions of the upper surface. As a result, the cutting edges exhibit wavy shapes which are made up from this plurality of groove portions (14) and ridge portions (15) over the sloping surface, with the exception of these sloping surfaces. Furthermore, the groove portions and the ridge portions of the serrations are made as curved surfaces.