Method for manufacturing spark plug and caulking metallic mold
US6688932B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2002 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Jun 11, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a spark plug, the spark plug includes: a cylindrical metal shell having a portion to be caulked and a tool-engaging portion that is to be attached on an engine; an insulator that is inserted into the metal shell and extends axially; and a caulking metallic mold, the method including caulking the portion to be caulked to be fixed to an outer circumferential face of the insulator with the caulking metallic mold, where in the caulking metallic mold includes a face, the face including a hard carbon film that includes an amorphous carbon phase, and the face is contact with or sliding to the portion to be caulked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.