HEAD MEMBER AND TOOL MAIN BODY OF DETACHABLE INSERT CUTTING TOOL, AND DETACHABLE INSERT CUTTING TOOL

摘要

In the head member (30) of a detachable insert cutting tool (70), a slit (38) is extending toward the further rear end side from the rear end of an insert fixing seat formed of the pressing plane at the upper flange portion of a head member main body (31) and the pedestal plane at the lower flange portion (33). A clamp screw engaging with the upper flange portion is driven along the extending direction of the slit (38) while inclining in the direction receding from a virtual plane (P) extending in the facing direction of the pressing plane and the pedestal plane toward the lower flange portion (33) side so that the upper flange portion can deform resiliently with the joint (39) between the rear wall face (38B) of the slit (38) and the rear end face (31F) of the head member main body (31) as fulcrum. The joint (39) is formed to gradually increase the width in the extending direction toward the receding direction of the clamp screw from the virtual plane (P).With such head member (30), a cutting insert (50) can be clamped stably by causing resilient deformation of the flange portion having the pressing plane straight to the pedestal plane while triggering a big clamping force.