| 摘要 |
<p>PURPOSE:To make disappear the concave grooves generated on the molded peripheral face of a receptacle and along wall holes, by molding the molded peripheral face of the receptacle to a smooth face by sending a high pressure air into each wall hole of a tube wall in time of a work being still hot immediately after the diameter of the receptacle being expanded by heating. CONSTITUTION:The work W of which the receptacle part 5 is heat softened is inserted onto an inner mold 6 and is expanded on its diameter by the tapered face 6a of the inner mold 6, then an outer mold 7 is closed, at the same time a flange 10 is attached to the joint end 9 of the work W. The expanding part 5a of the receptacle 5 is molded to expand its diameter by enlarging a segment 11 and the end parts of wall holes 18 are closed by pushing and squeezing the opening of wall holes 18 of the work W with the flange 8a of a ring 8. A high pressure air supplying tube 17 being opened, a high pressure air is sent and sealed in each wall hole 8 via a ring groove 10a, the concave grooves 5b disappear and both inner and outer peripheral faces are molded smoothly.</p> |
