Neck Fufushiwa manufacturing methods and Kubifu structure

摘要

PURPOSE:To provide a process for production of an oscillating node ring capable of easily producing the oscillating node ring of a small diameter with high accuracy and making mass production possible. CONSTITUTION:A core 16 having plural longitudinal hollow grooves 17 having a U-shaped cross section on its outer peripheral surface 16a and a small- diameter inside metallic tube 18 to be fitted into the longitudinal hollow grooves 17 of this core 16 are inserted into the outside metallic tube 15. Molten solder is injected into approximately triangular spacing parts 20 formed out of the inside surfaces of the hollow grooves 17, the inside surface 15a of the outside metallic tube 15 and the outside surface of the inside metallic tube 18 in the state of heating the core 16, the small-diameter inside metallic tube 18 and the outside metallic tube 15. Only the core 16 is removed from the outside metallic tube 15 after solidification of this solder to form the tube composite solder joined with the inside metallic tube 18 on the inside surface 15a of the outside metallic tube 15. Next, the tube composite is cut to be a sliced form.