| 摘要 |
PURPOSE: A method and an apparatus for manufacturing ferrule are provided to manufacture the ferrule for connecting rubber hose and metal pipe having different diameter to each other using an existing metal pipe as a material to be processed. CONSTITUTION: The method comprises cutting process of obtaining a base material by properly cutting a long metal pipe correspondingly to length of ferrule to be manufactured; first forming process of obtaining first formed material an upper part of which is formed in a semicircular shape by press forming the base material using an upper operating die so that an upper part of the base material is reduced in a semicircular shape after setting up the base material obtained from the cutting process on a lower fixing die of first forming unit; second forming process of obtaining second formed material an upper circumferential part of which is formed flat, and a central part of which is formed in a cone shape by press forming the first formed material using an upper operating die in the state that the first formed material passing through the first forming process is inserted between supporting protrusions of lower fixing die of second forming unit, thereby pressing the first formed material in such a way that an upper circumferential part of the first formed material is flattened, and a central part of the first formed material has a mountain shaped cross section; third forming process of obtaining third formed material an upper part of which is formed flat by pressing an upper part of the second formed material with a flat pressing surface of an upper operating die in the state that the second formed material passing through the second forming process is inserted between supporting protrusions of lower fixing die of third forming unit; and fourth forming process of completing the ferrule by punching the third formed material using punch protrusion of upper operating die in the state that the third formed material passing through the third forming process is inserted between supporting protrusions of lower fixing die of fourth forming unit, thereby penetrating a hole of a certain diameter on an upper central part of the third formed material.
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