| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for forming an expanded part of a resin tube hardly causing a bend during expanding the tube and a difficult removal of a mold after expanding the tube and showing good dimensional stability of the expanded tube. <P>SOLUTION: The method for forming the expanded part of the resin tube 1 comprises: forming a pair of circumferential grooves 3a and 3a each having a flow passage 2a in a lengthwise direction and one closed end; after forming a fluid nozzle 2 mounted between the circumferential grooves 3a and 3a and having an opening 4 communicating with the flow passage 2a, attaching seal rings 3 and 3 in the circumferential grooves 3a and 3a of the fluid nozzle 2; inserting the fluid nozzle 2 in the resin tube 1 to form a pressurization space 5; attaching separate molds 6a and 6b each having the circumferential surface, which forms the inner expanded space 7 and coincides with the outside shape of the expanded tube, to the outer circumference of the pressurization space 5 of the resin tube 1; heating the resin tube 1 and loading adhesion force to the separate molds 6a and 6b; and introducing the pressurized fluid via the opening 4 of the fluid nozzle 2 to the pressurization space 5 to form the expanded part 1a in the resin tube 1. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
