Method for manufacturing spark plug

Details Method for manufacturing spark plug Method for manufacturing spark plug

2008-03-25

2008-03-25

Phan, Tim (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S746000, C029S844000, C029S03300H, C313S138000, C313S139000, C313S141000, C445S004000, C445S007000

Reexamination Certificate

active

07346983

ABSTRACT:
A spark plug is provided, for a provisional bending process for manufacturing the spark plug, as a work in a condition where an earth electrode is straight and substantially in parallel with an axial line of a center electrode. In the provisional bending process, two searchers individually facing the tip of the center electrode with the tip located therebetween are arranged, positions of the searchers in a first direction perpendicular to the axial line being adjusted for every spark plug. Then a bending punch is driven to press a second end-surface of the other end of the earth electrode down to the searchers so that the earth electrode is provisionally bent at a substantially perpendicular angle to the axial line, the second end-surface being opposite to the first end-surface. Preferably, before the provisional bending process, positioning the work and correcting the position and tilt of the work are performed.

REFERENCES:
patent: 6790113 (2004-09-01), Fujita
patent: 7112112 (2006-09-01), Fujita et al.
patent: 2000-164320 (2000-06-01), None

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