Development of the new-type indexable inserts with helical rake faces

Abstract

A kind of new-type indexable insert with a three-dimensionally shaped rake face, namely the helical rake face, is developed in this present work, contributing to the formation of short conical helical chips acceptable for modern automated and unattended machining systems. The geometric parameters of the helical rake face consist of the helical gradient, the helical length, the beginning rake angle at the tool nose and the end rake angle on the cutting edge. The influences of these parameters on the side-curling of the chip and on the chip breakability are investigated. Under the cutting conditions employed in this paper, the cutting force measuring results show that the cutting component of the resultant tool force and the radial force when using the tool insert with the helical rake face are less than those when using the type CNMG120408-ZF tool insert, a kind of commercially available insert widely used.