Drill and method of manufacturing drilled product

Patent metadata

Field	Value
Publication number	US-9987691-B2
Application number	US-201615219074-A
Country	US
Kind code	B2
Filing date	Jul 25, 2016
Priority date	Aug 31, 2015
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Makotoloy Co Ltd
• Honda Seimitsu Kogyo Kk
• Fuji Heavy Ind Ltd
• Subaru Corp

Inventors

• Higashiwaki Hirofumi
• Honda Takuya
• Watanabe Masao
• Saito Manabu

Classifications

• B23B2251/404

  with decreasing depth in a direction towards the shank from the tool tip · CPC title

• B23B2251/242

  increasing in a direction towards the shank from the tool tip · CPC title

• B23B2226/27

  Composites · CPC title

• B23B2222/28

  Details of hard metal, i.e. cemented carbide · CPC title

• B23B51/02 Primary

  Twist drills · CPC title