| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a spark plug capable of restraining eccentricity or axial shift at a hole part of a molded body in grinding the molded body into a shape of an insulator after molding the molded body with raw material powder. SOLUTION: In a manufacturing process of the insulator constituting the spark plug, a molded body 30 molded from raw material powder is ground to form a shape corresponding to the insulator. In the grinding process, the molded body 30 is brought into contact with a rotating roller for grinding 35 under rotation, and is concurrently brought into contact with a rotating roller for pressing 37 to apply a turning force against a frictional force received from the rotating roller for grinding 35 for support by a support roller 38. At this time, a control device 42 controls an air cylinder 40 on the basis of the amount of deflection of a threading pin P1 detected by a laser displacement gauge 41, thereby adjusting a thrust which pushes the support roller 38 against the molded body 30. COPYRIGHT: (C)2010,JPO&INPIT
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