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US 9,868,157 B2Granted
Cutting tool assembly
AssigneeTaeguTec, Ltd.
InventorsChang Hee Choi, Chang Gyu Park
Life of this patent
Estimating the term…
Abstract
A cutting tool assembly has a cutter body, a clamp pin, a cutting insert and a set screw. The clamp pin is inserted to the cutter body to secure the cutting insert to an insert pocket. The set screw is fastened to a threaded hole of the cutter body to press the clamp pin toward the insert pocket. A side surface of the cutting insert contacts a side wall of the insert pocket at a first contact portion. A head of the clamp pin contact an inner peripheral surface of a bore of the cutting insert at a second contact portion. The first and second contact portions are located such that a moment acts on the cutting insert toward the base wall of the insert pocket around the first contact portion.
Claims20
A cutting tool assembly, comprising:
- a cutter body comprising:
- an insert pocket having a base wall, two or more side walls and a corner portion between the side walls;
- a clamp pin hole obliquely extending from the base wall;
- and
- a threaded hole inclined with respect to the clamp pin hole and joined to a lower portion of the clamp pin hole at an inner end thereof;
- a clamp pin comprising:
- a pin body inserted to the clamp pin hole and having a body central axis (C1) extending in a longitudinal direction;
- a head extending along a head central axis (C2) forming an angle (α) with the body central axis (C1), the head having a pressing surface directed to the corner portion of the insert pocket;
- and
- a notch formed at a lower portion of the pin body;
- a cutting insert comprising:
- a top surface;
- a bottom surface;
- side surfaces located between the top surface and the bottom surface and contacting the side walls of the insert pocket;
- and
- a bore having an inner peripheral surface which the pressing surface of the head contacts;
- a set screw fastened to the threaded hole, the set screw engaging the notch of the clamp pin and pressing the head of the clamp pin toward the base wall of the insert pocket, and
- a spring disposed between a closed end of the clamp pin hole and a bottom end of the pin body;
- wherein:
- a first contact portion (P3) where the side surface of the cutting insert contacts the side wall of the insert pocket and a second contact portion (P4) where the pressing surface of the head contacts the inner peripheral surface of the bore are located such that a moment acts on the cutting insert toward the base wall of the insert pocket around the first contact portion (P3).
17 more elements
A cutting tool assembly, comprising:
- a cutter body comprising:
- an insert pocket having a base wall, two or more side walls and a corner portion between the side walls;
- a clamp pin hole obliquely extending from the base wall;
- and
- a threaded hole inclined with respect to the clamp pin hole and joined to a lower portion of the clamp pin hole at an inner end thereof;
- a clamp pin comprising:
- a pin body inserted to the clamp pin hole and having a body central axis (C1) extending in a longitudinal direction;
- a head extending along a head central axis (C2) forming an angle (α) with the body central axis (C1), the head having a pressing surface directed to the corner portion of the insert pocket;
- and
- a notch formed at a lower portion of the pin body;
- wherein the pin body comprises a stopper protrusion protruding from the pin body, the stopper protrusion being rotationally opposite the notch, relative to the body central axis (C1), such that an imaginary line (L1) passing through the stopper protrusion and perpendicular to the body central axis (C1) intersects the notch;
- a cutting insert comprising:
- a top surface;
- a bottom surface;
- side surfaces located between the top surface and the bottom surface and contacting the side walls of the insert pocket;
- and
- a bore having an inner peripheral surface which the pressing surface of the head contacts;
- and
- a set screw fastened to the threaded hole, the set screw engaging the notch of the clamp pin and pressing the head of the clamp pin toward the base wall of the insert pocket, wherein:
- a first contact portion (P3) where the side surface of the cutting insert contacts the side wall of the insert pocket and a second contact portion (P4) where the pressing surface of the head contacts the inner peripheral surface of the bore are located such that a moment acts on the cutting insert toward the base wall of the insert pocket around the first contact portion (P3).
17 more elements
A clamp pin for clamping a cutting insert in a cutting tool, the clamp pin comprising:
- a pin body having a body central axis (C1) extending in a longitudinal direction;
- a head extending along a head central axis (C2) which forms an angle (α) with the body central axis (C1), the angle (α) ranging from 30 degrees to 60 degrees;
- a notch formed at a lower portion of the pin body;
- a stopper protrusion formed at a lower portion of the pin body and being rotationally opposite the notch, relative to the body central axis (C1), such that an imaginary line (L1) passing through the stopper protrusion and perpendicular to the body central axis (C1) intersects the notch;
- and
- a pressing surface formed on the head;
- wherein in a side view of the clamp pin in which the angle (α) appears greatest:
- the notch faces in a first direction while the stopper protrusion and the pressing surface protrude in a second direction which is opposite the first direction;
- and
- the body central axis (C1) and the head central axis (C2) form a supplementary angle ranging from 120 degrees to 90 degrees, the supplementary angle opening in the second direction.
7 more elements
Dependencies are inferred from the claim text.