Drilling tool for composite material
AssigneeTaeguTec, Ltd.
InventorJung Hoon Park
Life of this patent
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Abstract
A cutting tool is suitable for cutting a composite material. A drilling tool according to one embodiment includes a drill body and a shank. The drill body includes ribs formed in a spiral shape along the axis direction of the drill body, chip discharging grooves formed between the ribs, and a drill head formed at one end of the drill body where the shank is not formed. The drill head is formed in a multi-stage and first and second cutting edges are formed interposing a step portion therebetween, and the second cutting edge is formed toward the drill head. A point angle of the first cutting edge is 90° to 130°, a dish angle of the second cutting edge is 5° to 15°, and a twist angle between the chip discharging groove and the rotational axis of the drill body is 20° to 40°.
Claims16
A drilling tool for a composite material comprising a drill axis (A), a drill body and a shank formed at one end of the drill body,
- wherein the drill body comprises ribs formed in a spiral shape along the axis direction of the drill body, chip discharging grooves formed between the ribs, and a drill head formed at the other end of the drill body where the shank is not formed;
- wherein the drill head is formed in a multi-stage and a first cutting edge and a second cutting edge is formed interposing a step portion therebetween, the second cutting edge being formed toward the drill head;
- and wherein:
- a point angle of the first cutting edge is 90° to 130°,
- a dish angle of the second cutting edge is 5° to 15°, and
- a twist angle formed between the chip discharging groove and the rotational axis of the drill body is 20° to 40°.
A drilling tool for a composite material comprising a drill axis (A), a drill body and a shank,
- wherein the drill body comprises ribs formed in a spiral shape along the axis direction of the drill body, chip discharging grooves formed between the ribs, and a drill head formed at the other end of the drill body where the shank is not formed;
- wherein the drill head is formed in a step shape and a first cutting edge and a second cutting edge is formed interposing a step portion therebetween, the second cutting edge being formed toward the shank portion;
- and wherein:
- a point angle of the first cutting edge is 90° to 130°,
- a leading angle of the second cutting edge is 20° to 50°, and
- a twist angle formed between the chip discharging groove and the rotational axis of the drill body is 20° to 40°.
A drilling tool for a composite material comprising a drill axis (A), a drill body and a shank formed at one end of the drill body,
- wherein the drill body comprises ribs formed in a spiral shape along the axis direction of the drill body, chip discharging grooves formed between the ribs, and a drill head formed at the other end of the drill body where the shank is not formed;
- wherein the drill head is formed in a multi-stage and a first cutting edge and a second cutting edge is formed interposing a step portion therebetween, the second cutting edge being sloped relative to drill axis (A);
- and wherein:
- a point angle of the first cutting edge is 90° to 130°,
- a twist angle formed between the chip discharging groove and the rotational axis of the drill body is 20° to 40°;
- and
- the second cutting edge is either:
- (a) radially outwardly sloped towards the one end of the drill body with a leading angle (β2) of 20° to 50°, or
- (b) radially outwardly sloped towards the other end of the drill body with a dish angle (β1) of 5° to 15°.
Dependencies are inferred from the claim text.