| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of forming a tube fitting part preventing casting porosity leak on a cast end member. SOLUTION: A tube fitting part fitting a tube 4 of pressurized fluid is formed on an end member 1 made of aluminum casting 1a by cutting of the casting 1A. The casting 1A is provided with a tube fitting step part 3A on a main body part 2A, a step down part 7A of a smaller diameter difference than a depth of a seal member groove 6 continuing the step art 3A at the tip side, and is formed in a shape maintaining a thin machining allowance for surface finishing on entire body. The seal member groove 6 of necessary depth from a surface of a tube fitting step 3 for mounting a seal member 5 is formed on the step part 3A, and a locking projection part 8 much lower than the tube fitting step part 3 for preventing the seal member 5 from falling off at the tip side of the step part 3 is remained during surface finishing to remove the machining allowance of the casting 1A by cutting.
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