| 摘要 |
PURPOSE:To prevent the damage of the nose of a tube body by the split pieces of an intermediate split die by reducing the diameter of the intermediate split die prior to the insertion of the tube body while covering a range extending over a rear die from at least the annular projection of the intermediate split die with a slidable ring. CONSTITUTION:When the end section of a tube body 1 previously heated is inserted to a core 10, the diameter of the end section is increased by a taper 11a in the rear section of a front die 11, and the insertion of the tube body 1 is stopped when the nose of the tube body collides with a collar section 20b. The diameter of an intermediate split die 13 is increased, air is sucked through intake paths 14-17, and the tube body 1 is molded to a final shape. The nose of the tube body 1 is brought into surfacle-contact with the outer circumferential surface of a rear die 12 prior to the increase of the diameter of the intermediate split die 13 and airtight properties can be ensured at that time. The intake is stopped while water is sprinkled over the tube body 1 to solidify the tube body, the diameter of the intermediate split die 13 is reduced, a ring 20 is moved in the direction of the arrow, and the tube body 1 is pulled out of the core 10. |
