| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a spark plug in which a ground electrode can be prevented from being damaged when removing a welding projection formed at a joint portion between the main metal fittings and the ground electrode. SOLUTION: A correction jig 300 having a correction member 380 in which a conical recess 385 is formed is held vertically movably in the vertical direction (axial line P direction) by an elevating device. Underneath it, the metal fittings assembly 200 in which a base end part 32 of the ground electrode 30 is welded to the tip face 57 of the main metal fittings 50 is placed in a state that the tip face 57 is facing upward. When the correction jig 300 is descended toward the metal fittings assembly 200, the tip part 31 of the ground electrode 30 is contacted with the recess 385 of the correction member 380, and inclination of the ground electrode 30 is corrected so that the tip part 31 comes closer to the axial line O of the main metal fittings 50 than the base end part 32 along the conical face (inclined face). COPYRIGHT: (C)2007,JPO&INPIT
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