Patent ID: 9199313
Filing Date: 2015-12-01
Classification: B23B,Y10T

Abstract:
1. A tool body having a clamping device for clamping a cutting insert, comprising: an insert seat having an insert seat surface; a guide hole formed in the tool body and opening out to the insert seat surface; a screw hole formed in a direction intersecting with the guide hole from a side surface of the tool body and connected to the guide hole; a clamp member having a clamp portion and being arranged movably in a predetermined guiding direction in the guide hole, the clamp portion having an insert contact surface; and a screw member occupying the screw hole and movable in opposite first and second directions along a central axis line of the screw hole; wherein: the screw member is configured to engage the clamp member upon movement of the screw member both in the first direction and in the second direction, the screw member applying a force in a first direction to the clamp member when the screw member moves in the first direction and applying a force in a second direction to the clamp member when the screw member moves in the second direction; the guide hole has a first sliding surface engaged with the clamp member when the screw member moves in the first direction, the first sliding surface configured to convert the force in the first direction into a force for moving the insert contact surface of the clamp portion in a direction toward a cutting insert, when a cutting insert is seated on the insert seat surface, the guide hole has a second sliding surface engaged with the clamp member when the screw member moves in the second direction, the second sliding surface configured to convert the force in the second direction into a force for moving the insert contact surface of the clamp portion in a direction away from a cutting insert, when a cutting insert is seated on the insert seat surface; the screw hole is arranged so that its central axis line is substantially parallel to the seat surface of the insert seat; the clamp member has a first screw engagement surface which is engaged when the screw member moves in the first direction and a second screw engagement surface which is engaged when the screw member moves in the second direction; the clamp member has a first contact surface engaged with the first sliding surface when the screw member moves in the first direction, and a second contact surface engaged with the second sliding surface when the screw member moves in the second direction; and the first and second contact surfaces are constituted by planes and inclined with respect to the first and second screw engagement surfaces, respectively.