| 摘要 |
PURPOSE:To obtain an airtight seal between hollow bodies and to prevent generation of burrs on a joint, by a method wherein after both split pieces of the hollow body have abutted against each other, they are unified by molding a filling material by filling the same into a casting long groove through a casting port. CONSTITUTION:Long grooves 3, spare long grooves 4, 4 and a casting port 2 are kept molded respectively on the inside of the center of a connecting part 5 connecting a plurality of hollow bodies with each other, both sides of the long groove 3 and further appropriate position of one side of the long grooves. The long groove 3 having the casting port 2 on an appropriate position of the center part of a connecting part 5 by abutting both split pieces against each other and enclosed spare long grooves 4, 4 are set up within a mold by forming them and then post-forming is performed by casting a filling material 7 through the casting port 2. With this constitution, as the long groove 3 for casting the filling material is running within the connecting part, joining can be performed so that a post-forming member is not visible from the outside. Even if the filling material flows out through an abutting surface of the long groove 3 with pressure, ejection of burrs up to the inside of the hollow body can be prevented by only driving the burrs within the spare long grooves 4, 4. |
