| 摘要 |
PROBLEM TO BE SOLVED: To improve resistance against pressure of a socket part by bonding an inner layer which is provided with a rubber ring mounting groove on its inner circumferential face and consists of a cylindrical body made of anticorrosive metal and an outer layer which is formed along an outer face of the cylindrical body by press-fitting the cylindrical body in one end of a synthetic resin pipe which is in a softened condition on their boundary face. SOLUTION: This socket part is provided with an inner layer and an outer layer, and a rubber ring mounting groove 71 in which a rubber ring can be mounted on its inner circumferential face is provided. This receive port part is formed by preparing a pipe 6 made of polyethylene which becomes the outer layer and a cylindrical body 7 made of stainless steel which becomes the inner layer, softening the pipe 6 by heating it, and then press-fitting the cylindrical body 7 into the pipe 6. At this time, a part on a tip side of the pipe 6 is expanded until its diameter becomes substantially the same as a diameter of a swelled part 72 of the cylindrical body 7 once due to the press-fitting of the cylindrical body 7. After that, however, it is shrunk naturally so that the pipe 6 adheres on the cylindrical body 7 closely. Next, the cylindrical body 7 is heated by using high frequency to melt an inner face of the pipe 6 on a boundary face of the cylindrical body 7 and is cooled to obtain the socket part 1 in which the inner layer and the outer layer are bonded and integrated. |
