| 摘要 |
PURPOSE: A yoke plate manufacturing method and a product manufactured by the same are provided to stabilize dimension and characteristic value by the stable structure of a groove, since a yoke hole is formed on the upper surface, front surface, and rear surface of the groove of a box type. CONSTITUTION: A yoke plate manufacturing method comprises following steps. A groove of a box type is drawn in the center of a board(100). Cam holes(220,230) are formed on the front, rear, and upper surfaces of a groove. A circular groove(200a) is formed since the center of a board is punched in first drawing. An elliptical groove(200b) is formed, since the bottom of the circular groove is punched in second drawing. A rectangular groove(200) is formed, since the bottom of the elliptical groove is punched in third drawing. The groove is drawn to make the thickness of a groove uniform in fourth drawing.
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