| 摘要 |
PROBLEM TO BE SOLVED: To directly form an extended part on the end of a product by immersing the end in a molten pool of an alloy and pulling the end up at speed enough to form the extended part. SOLUTION: An Ni base superalloy material is put in a water cooled copper crucible installed in an operation chamber that can be filled with argon gas and then, the chamber is filled with argon gas, the superalloy is molten in the crucible. In order to immerse, hold and pull up the product, it is arranged in a holding means. A driving means is connected to a control means, which contains a computer controller for controlling the depth of insetting the extension end of the product into the molten material, holding time and pulling-up speed. With a rotor blade lowered into the molten pool, the inserted part of the blade is remelted through an interaction with the molten metal. The rotor blade also functions as a seed crystal for orientation growth for the purpose of solidifying the extended part from the molten superalloy. Then, the rotor blade is pulled up by moving it upward at a prescribed speed. Thus, the extended part is solidified that is provided with the same polycrystal unidirectional sulidification crystal structure as the rotor blade. |
