Tool holder assembly for multifunction machine and adapter for the same

A tool holder assembly for multifunctional machining, comprising:

• a cylindrical body with a rotation axis;
• a head part having a pocket for receiving one cutting insert;
• a chip groove started from the head part and extended to a rear side of the tool holder body for serving as a moving passage of chips;
• a cooling water tube started from an end part of a shank part, extended throughout entire tool holder in a form of a straight line, and sloped at an end part of the head part to face an outer nose of the cutting insert;
• and
• a cutting insert received in the pocket,
• wherein the cutting insert has a hexahedral form, and includes:
• a screw hole in a center part thereof,
• chip formers around the screw hole, each having a slope angle,
• side surfaces each having a positive relief angle connected between a bottom surface and an upper surface of a cutting insert body,
• cutting edges at intersections of the upper surfaces and the side surfaces, each having three straight lines and a curved line,
• wherein there is a rounded nose at each of four corner parts where the side surfaces with the cutting edges are connected, including an outer nose which fixes a size of drilled hole when the cutting insert is mounted on a tool holder, and an inner nose disposed such that a cutting edge is disposed beyond a center line of the tool holder,
• wherein the outer nose is formed to have an acute angle smaller than the inner nose having an obtuse angle, and the cutting edges, the chip formers and the side surfaces are formed to be symmetrical with respect to a line dividing the nose into two equal parts.