| 摘要 |
PROBLEM TO BE SOLVED: To mold a T-shaped tube joint having small damage due to concentration of a stress of a hydraulic pressure or water hammer by forming an inner surface of a branch in a curved surface state and eliminating its edgelike part. SOLUTION: This mold comprises an outer mold 1 having a mold surface 11 corresponding to an outer surface shape of a tube joint 6, and an inner mold having cores 2 for a tube receptacle, a core 3 for a branch receptacle and cores 4 for an undercut part of the inner surface of the branch. These cores are inserted into a mold surface of the mold 1 and butted to form a mold surface 51 corresponding to the inner surface shape of the joint 6. |
