Spark plug manufacturing method
AssigneeNgk Spark Plug Co., Ltd.
InventorsHironori Uegaki, Toshitaka Honda
Life of this patent
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Abstract
A spark plug manufacturing method provides a reduction in the cost of raw material preparation and the cost of the disposal of unused powder by recycling powder not used in forming a filler layer of another spark plug. The method is used to make a spark plug that includes a metal shell having a through hole, and an insulating body held inside the through hole, and a filler layer containing talc in a space surrounded by an inner peripheral surface of the through hole and an outer peripheral surface of the insulating body. The powder not used in a process of forming a filler layer of another spark plug is recycled for forming the filler layer of the present spark plug, where the forming process is performed after talc and a binder are mixed.
Claims6
A method of manufacturing a spark plug comprising:
- a metal shell having a through hole;
- an insulating body held inside the through hole;
- a filler layer containing talc in a space surrounded by an inner peripheral surface of the through hole and an outer peripheral surface of the insulating body, the method comprising the step of;
- recycling powder not used in a process of forming a filler layer of another spark plug in order to form the filler layer of said spark plug, said process of forming the filler layer of the other spark plug being performed after talc and a binder are mixed in the filler layer.
Dependencies are inferred from the claim text.