| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for manufacturing an outer tube or the like for suppressing a cause of pressure leakage of the outer tube, reducing man day, and inexpensively manufacturing the outer tube.SOLUTION: In a method for manufacturing an outer tube for molding an outer tube 3 which is a component of a buffer by installing a core 2 inside a main mold 1 and pouring molten metal 10 between the main mold 1 and the core 2, the core 2 comprising: an inner peripheral surface molding part 21 for molding an inner peripheral surface 4 of the outer tube to the inner peripheral surface 4 having draft gradient; and a bearing press-fit surface molding part 22 for molding a bearing press-fit surface 7 which is a surface in parallel with a center axis 6 of the outer tube at a part of the inner peripheral surface 4 of the outer tube, is used as the core 2.</p> |
