| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a spark plug capable of manufacturing the spark plug having an excellent ignitability and durability at a lower cost than a conventional one. SOLUTION: By applying a press forming on a grounding electrode material 40 using a press molding 200, a projection part 41 with a prescribed shape is formed at a prescribed position of the grounding electrode material 40. Then, after cutting the grounding electrode material 40 with the projection part 41 formed into a prescribed length, the grounding electrode material 40 cut in the prescribed length is fixed to a welding jig 210 and the base end side of the grounding electrode material 40 is welded to the tip side of a main fitting 1. COPYRIGHT: (C)2009,JPO&INPIT
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