| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide piping joint structure formed with good workability and free from defectiveness caused by burrs even when heightening strength with a reinforcing groove in forming a joint member by die casting. SOLUTION: The end part of a pipe is integrally fitted into a fit-in hole 3 opened to both faces of a joint member 2. The joint member 2 is formed by die-casting, and pipe guide parts 5 gradually enlarged outward to the outer diameter side, and relief recessed parts 6 formed further on the outer diameter side from the pipe guide parts 5, are formed at both open edges of fit-in hole 3.</p> |
