| 摘要 |
<p>PURPOSE:To easily set a sealing rubber ring to a socket of pipe and to prevent a core and a rubber ring from extruding or falling from the socket. CONSTITUTION:The diameter of the end part of a lining tube 11 is expanded to two steps, a diameter reducing die 16 is prssed in the direction of a tube axis to the side of an opening end 4a of a diameter expanding part 14 while it is held in the die 15 except a part in the side of the opening end 4a, then, after the opening end 4a is reduced in diameter to form the socket 4, further, the diameter reducing die 16 is pushed a prescribed amount in the same direction, buckling and diameter reduction are made to occur between the 1st step diameter expanding part 12 and the 2nd step diameter expanding part 13. Then, the inside of the diameter reducing part 10 is brought into contact with a core 7 and the core 7 is fixed and held by the frictional force of the contact part to a prescribed position.</p> |
