Method of manufacturing center electrode for spark plug

Details Method of manufacturing center electrode for spark plug Method of manufacturing center electrode for spark plug

2006-07-11

2006-07-11

Vo, Peter (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S508000, C029S511000, C029S517000, C029S746000, C445S007000

Reexamination Certificate

active

07073256

ABSTRACT:
In a method of manufacturing a center electrode for a spark plug, a core member is press-fitted into a metal cup and, thereafter, a cold-forging process is performed to form a small-diameter portion at a closed end of the metal cup. The small-diameter portion is completely free from deformation which may occur during press-fitting operation. Thus, the small-diameter portion has excellent accuracy in shape. Furthermore, since the press-fitting is performed before the cold-forging of the small-diameter portion, it is possible to increase the press-fitting load or pressure to the extent that the core member and the metal cup are joined together with a sufficient degree of adhesion which will insure the a center electrode to have good thermal conductivity.

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