Cutting tool with detachable insert, head member and tool body of the same

Abstract

In a head member () for this cutting tool with detachable insert (), a slit () is provided so as to further extend towards a rear end side from a rear end for an insert attachment seat formed by a pressing surface of an upper jaw portion of a head member body () and a pedestal surface of a lower jaw portion (). Also, a clamp screw engaged with the upper jaw portion is screwed while inclining in a direction separated as it moves towards the lower jaw portion (), with respect to an imaginary plane (P) which extends along an extension direction of the slit () and in a direction in which the pressing surface and the pedestal surface face each other, whereby the upper jaw portion is enabled to elastically deform by using as a fulcrum a connecting portionbetween a rear wall surface (B) of the slit (), and a rear end surface (F) of the head member body (). Moreover, the connecting portion () is formed such that the width thereof in the extension direction becomes gradually greater as the clamp screw moves in a separating direction from the imaginary plane (P). According to the head member (), a cutting insert () can be stably clamped by elastically deforming the jaw portion formed with the pressing surface straight with respect to the pedestal surface while operating a large clamping force.