| 摘要 |
PURPOSE:To make it possible to separate a molded reel hub together with a male mold from a female mold by a method wherein the surface roughness of the projected part side, by which the recessed part of the reel hub is formed, of the male mold is specified. CONSTITUTION:On a male mold 4, a hollow disc-like recessed part, by which the under surface of the flange 1a of a reel hub is formed, a columnar projected part, by which the inner surface of the peripheral wall part 1b and the top surface of the upper plate part 1c of the reel hub 1 are provided. In addition, a plurality of axially parallel grooves are provided on the side 4a of the projected part. Surface roughness of 8-15mum is given to the side 4a by electrical discharge machining, for example. The similar surface roughness is produced on the side of the recessed part in the interior of the inner peripheral wall part of the reel hub so as to correspond to said surface roughness. By engaging both the roughened sides with each other, frictional force is generated between the reel hub and the male mold. As a result, at the separation of the male mold 4 from a female mold 2, the molded reel hub together with the male mold easily separates from the female mold and then stripped from the male mold without being damaged through the ejection of ejector pins 6. |
