Back to results
US 9,966,737 B1Granted
Method for manufacturing spark plug
AssigneeNgk Spark Plug Co., Ltd.
InventorShunsuke Maki
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for manufacturing a spark plug in which a tip is welded to a ground electrode. After the tip is welded to a distal end portion of the ground electrode, polishing treatment or grinding treatment is performed on at least a part of an edge region of a distal end face of the ground electrode. After the polishing or grinding treatment, an image of the distal end face of the ground electrode and the tip is taken with the use of reflected light and then analyzed by image processing.
Claims5
A method for manufacturing a spark plug, the spark plug comprising:
- a metal shell;
- a rod-shaped ground electrode having a base end portion joined to the metal shell and a distal end portion located opposite the base end portion, the distal end portion including a tip weld surface and a distal end face;
- and a tip welded to the tip weld surface of the distal end portion of the ground electrode, the method comprising:
- a welding step of welding the tip to the tip weld surface of the ground electrode;
- after the welding step, a treatment step of performing polishing treatment or grinding treatment on at least a part of an edge region of the distal end face of the ground electrode;
- and
- after the treatment step, an image processing step of taking an image of the distal end face of the ground electrode and the tip with the use of reflected light and performing image processing on the taken image.
4 more elements
Dependencies are inferred from the claim text.