Fine blanking mold manufacturing method of banana slot in pulley uSing the same the pulley

摘要

An objective of the present invention is to provide a fine blanking mold, a method of machining a banana slot (310) in a pulley using the same, and a pulley with a machined banana slot (310) using the same which use a fine blanking mold to reduce the width of a banana slot (310) of a pulley to machine the banana slot (310) to increase the surface area of the pulley (300) to increase friction and magnetic field. The fine blanking mold comprises: a lower mold (210) on which base metal (300) of a pulley is seated; an upper mold (220) to press the base metal (300) seated on the lower mold (210); a slot punch (230) to punch the base metal (300) to form a banana slot (310); and a counter punch (240) which is arranged to be symmetric with the slot punch (230) with respect to the base metal (300), and supports the base metal (300) when the slot punch (230) punches the base metal (300). A grade unit (231a) inclined in an angle of 5-15° is formed on an end of the slot punch (230).