| 摘要 |
PURPOSE: A manufacturing method of a nipple for a wire wheel is provided to omit a first and a second process of making holes by processing a stainless steel pie instead of a wire rod for cold forging and to improve the quality of a nipple and productivity by finishing manufacturing the nipple without a coating process. CONSTITUTION: A stainless steel pipe(1) is cut to extrude a rectangular portion(3) and to press the upper section of a head portion(2). Then the material is preformed to the head portion and holes are made thereon. Finally, the inside of the material is finished and the material is tapped to form a nut inside the finished semi-product. The nipple therefrom is connected with a bolt of a spoke to be fixed to a rim of a wire wheel. Herein, extruding the rectangular portion, performing the head portion, making holes and finishing the semi-product are performed by a heading machine while tapping is performed by a tapping machine. A die having the nipple material therein is kept in a die case, and a punch is positioned at the upper end of the nipple material. The punch pounds the nipple material to obtain a specific shape of article.
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