Title:
SPARK PLUG PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/221541
Kind Code:
A1
Abstract:
The objective of the invention is to provide a spark plug production method such that variation in the welding between an electrode matrix and a tip is less likely to occur.
The method comprises steps of: preparing, on an electrode matrix, a first surface with a surface area equal to or larger than the surface area to be in contact with the tip by polishing and/or grinding; preparing, on the electrode matrix, a second surface with a surface area equal to or larger than the surface area to be in contact with a first electrode by polishing or the like; bringing the tip into contact with the first surface of the electrode matrix; bringing the first electrode into contact with the second surface of the electrode matrix; and, after establishing a tip-to-second-electrode contact, allowing a current to flow between the first electrode and the second electrode to perform resistance welding.
Inventors:
SHIMAMURA TAKUYA (JP)
Application Number:
PCT/JP2017/016253
Publication Date:
December 28, 2017
Filing Date:
April 25, 2017
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
H01T13/20; H01T21/02
Foreign References:
| JP2015153724A | 2015-08-24 | |||
| JP2003123937A | 2003-04-25 |
Other References:
See also references of EP 3477800A4
Attorney, Agent or Firm:
AOKI Noboru et al. (JP)
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