| 摘要 |
PURPOSE: A method for manufacturing a nipple is provided to minimize deviation in circularity and achieve accurate dimension even in case of a nipple of small thickness. CONSTITUTION: A method for manufacturing a nipple comprises the steps of: forming one end of a metal pipe having fixed length to the length corresponding to a hole insertion part in order to have a first diameter(D1) greater than the diameter of the hole insertion part, forming one end of the metal pipe in order to be smaller than the first diameter over the length corresponding to the hole insertion part, and forming one end of the metal pipe in order to have the diameter of the hole insertion part over the length corresponding to the hole insertion part.
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