Method of producing spark plug, and spark plug

Details Method of producing spark plug, and spark plug Method of producing spark plug, and spark plug

2011-03-01

2011-03-01

Ton, Toan (Department: 2889)

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

C313S141000, C313S118000

Reexamination Certificate

active

07896720

ABSTRACT:
A method of producing a spark plug includes reducing the diameter of a center electrode while maintaining the heat dissipation property of the center electrode. A columnar member in which an outer skin member and a core member having a high thermal conductivity are clad, and which is columnarly extended, are configured by extrusion molding into a state where the thickness of the outer skin member is substantially uniform. A flange portion and a tip end portion are formed in the columnar member to obtain an electrode intermediate member. In a middle trunk portion of the electrode intermediate member, the thickness of the outer skin member is maintained. Then, the surface of the middle trunk portion is cut or polished to reduce the thickness, whereby the diameter of a center electrode is reduced while maintaining the outer diameter of the core member.

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The State Intellectual Property Office of P.R. China, Office Action for related Chinese Application No. 2007800000962.5, issued Jun. 25, 2010.

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