| 摘要 |
<p>The tube main body (12) of a curved tube (10) has a flow path following the axis line (12A), and has a curved section (14) in one portion of the direction along the axis line (12A). Further, in the inner periphery (14A) on the inside of the curve direction of the curved section (14) in the tube main body (12), a depression (16) is formed as an expanded cross-section portion along the direction of the axis line (12A). Further, in the inner die of the die for forming the curved tube, a hinge core forming the depression is inserted in a groove of the main core, and by the main core moving towards a retracted position, the tip of the hinge core, which has a shape that engages the inner periphery (14A) on the inside of the curve direction of the curved section (14), swings towards the formation position of the main core.</p> |
