Drill and method of manufacturing drilled product
View Patent ↗According to one implementation, a drill that drills at least one of a composite material and a metal is provided. A web thickness at least at a tip of the drill is not less than 5% and less than 25% of at least one diameter of the drill. Further, according to one implementation, a method of manufacturing a drilled product is provided. The drilled product is manufactured by drilling a workpiece using the above-mentioned drill. The workpiece is made of the at least one of the composite material and the metal.
1. A drill that drills at least one of a composite material and a metal,
wherein a web thickness at least at a tip of the drill is not less than 5% and less than 25% of at least one diameter of the drill, and
wherein a body of the drill is made of a cemented carbide or a material having at least a hardness and a toughness substantially same to a hardness and a toughness of the cemented carbide.
2. The drill according to claim 1 , wherein the body is made of the cemented carbide, a cermet, or a ceramic of a hardness and toughness of a same extent of the cemented carbide.
3. The drill according to claim 1 , wherein the at least one diameter is not less than a diameter of a drill of which nominal designation number is 11.
4. The drill according to claim 3 , wherein the at least one diameter is larger than 5 mm.
5. The drill according to claim 1 , wherein the web thickness at least at the tip of the drill is not less than 10% and not more than 20% of the at least one diameter.
6. The drill according to claim 1 , wherein the drill comprises a step drill having at least two diameters, and
wherein web thicknesses corresponding to the at least two diameters are not less than 5% and less than 25% of the at least two diameters respectively.
7. The drill according to claim 1 , wherein at least a part of the web thickness thickens not less than 3.5 mm per 100 mm in a length direction.
8. The drill according to claim 6 , wherein a web of the drill has a partial taper or tapers having different inclined angles, the partial taper or the tapers corresponding to the at least two diameters.
9. The drill according to claim 1 , wherein at least one land of the drill has at least one nick.
10. A method of manufacturing a drilled product, wherein the drilled product is manufactured by drilling a workpiece using the drill according to claim 1 , the workpiece being made of the at least one of the composite material and the metal.
11. The drill according to claim 2 , wherein the at least one diameter is not less than a diameter of a drill of which nominal designation number is 11.
12. The drill according to claim 2 , wherein the web thickness at least at the tip of the drill is not less than 10% and not more than 20% of the at least one diameter.
13. The drill according to claim 2 , wherein the drill comprises a step drill having at least two diameters, and
wherein web thicknesses corresponding to the at least two diameters are not less than 5% and less than 25% of the at least two diameters respectively.
14. The drill according to claim 2 , wherein at least a part of the web thickness thickens not less than 3.5 mm per 100 mm in a length direction.
15. The drill according to claim 2 , wherein at least one land of the drill has at least one nick.
16. A method of manufacturing a drilled product, wherein the drilled product is manufactured by drilling a workpiece using the drill according to claim 2 , the workpiece being made of the at least one of the composite material and the metal.
17. A method of manufacturing a drilled product, wherein the drilled product is manufactured by drilling a workpiece using the drill according to claim 3 , the workpiece being made of the at least one of the composite material and the metal.
18. A method of manufacturing a drilled product, wherein the drilled product is manufactured by drilling a workpiece using the drill according to claim 5 , the workpiece being made of the at least one of the composite material and the metal.
19. A method of manufacturing a drilled product, wherein the drilled product is manufactured by drilling a workpiece using the drill according to claim 6 , the workpiece being made of the at least one of the composite material and the metal.
20. A method of manufacturing a drilled product, wherein the drilled product is manufactured by drilling a workpiece using the drill according to claim 7 , the workpiece being made of the at least one of the composite material and the metal.