SURFACE-COATED MACHINING TOOLS

• US 20030118412A1
• Filed: 12/08/2002
• Published: 06/26/2003
• Est. Priority Date: 12/26/2001
• Status: Active Grant

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Fukui, Haruyo, Fukuda, Tatsuro
• Granted Patent: US 7,732,066 B2
• Time in Patent Office: Days
• US Class Current: 407/119
• CPC Class Codes: B22F 2005/001 Cutting tools, earth boring or grinding tool other than table ware
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• CPC Class Codes: B23B 51/00 Tools for drilling machines
• CPC Class Codes: B23C 2228/10 Coating
• CPC Class Codes: B23C 5/10 Shank-type cutters, i.e. with an integral shaft
• CPC Class Codes: C22C 29/08 based on tungsten carbide
• CPC Class Codes: C23C 30/005 on hard metal substrates
• CPC Class Codes: Y10T 407/27 comprising tool of specific chemical composition
• CPC Class Codes: Y10T 428/24694 Parallel corrugations
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

Abstract of Disclosure

Surface-coated machining tools in particular utilized in routing, slitting and drilling processes on printed circuit boards onto which integrated circuits and various electronic parts are populated. A cemented-carbide base material containing tungsten carbide and cobalt, with the cobalt inclusion amount being 4 weight % or more and 12 weight % or less, is furnished. A compound thin film made up of a combination of one or more elements selected from the group titanium, chromium, vanadium, silicon and aluminum, and one or more selected from carbon and nitrogen, is coated over the cemented-carbide base material. The compound thin film is coated in at least a single layer.

Claims

1. What is claimed is:

1. A surface-coated machining tool, comprising;

a cemented-carbide base material containing tungsten carbide and cobalt, with the cobalt inclusion amount being 4 weight % or more and 12 weight % or less; and

coated over said cemented-carbide base material, a compound thin film made up of a combination of one or more elements selected from the group titanium, chromium, vanadium, silicon and aluminum, and one or more elements selected from carbon and nitrogen;

wherein

said compound thin film is coated in at least a single layer.

2. The surface-coated machining tool set forth in claim 1, wherein said compound thin film is 0.05 μ

m or more and 3 μ

m or less in thickness.

3. The surface-coated machining tool set forth in claim 1, wherein a compressive residual stress of 0.1 GPa or more and 8 GPa or less is imparted to said compound thin film.

4. The surface-coated machining tool set forth in claim 1, wherein said compound thin film is in surface roughness adjusted to be 0.01 μ

m or more and 0.5 μ

m or less by indication Ra.

9. The surface-coated machining tool set forth in claim 1, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

10. The surface-coated machining tool set forth in claim 2, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

11. The surface-coated machining tool set forth in claim 3, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

12. The surface-coated machining tool set forth in claim 4, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

5. A surface-coated machining tool, comprising:

a cemented-carbide base material containing tungsten carbide and cobalt, with the cobalt inclusion amount being 4 weight % or more and 12 weight % or less; and

a hard carbon thin film made up essentially of carbon atoms only, coated over said cemented-carbide base material by a physical vapor deposition method in which graphite is made a raw material;

wherein

said hard carbon thin film is coated in at least a single layer.

6. The surface-coated machining tool set forth in claim 5, wherein said hard carbon thin film is 0.05 μ

m or more, and 3 μ

m or less in thickness.

7. The surface-coated machining tool set forth in claim 5, wherein a compressive residual stress of 0.1 GPa or more and 8 GPa or less is imparted to said hard carbon thin film.

13. The surface-coated machining tool set forth in claim 5, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

14. The surface-coated machining tool set forth in claim 6, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

15. The surface-coated machining tool set forth in claim 7, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.

8. The surface-coated machining tool set forth in claim 8, wherein said hard carbon thin film is in surface roughness adjusted to be 0.01 μ

m or more and 0.5 μ

m or less by indication Ra.

16. The surface-coated machining tool set forth in claim 8, wherein the tungsten carbide in said cemented-carbide base material is 0.1 μ

m or more and 1.5 μ

m or less in pre-sintering crystal-grain size.