| 摘要 |
The present invention relates to a method for manufacturing a pellet for a friction stir welding tool used in a friction stir welding tool of high melting point material, such as steel, titanium, or different materials, such as aluminum-steel, titanium. The method for manufacturing pellet for a friction stir welding tool includes: a filling step for inserting and mixing a sealed milling container into a ball milling device by mixing a carbide ball and alcohol in mixed powers of tungsten carbide powder, molybdenum carbide, and cobalt power and filling a mold of graphite with the mixed powders through a dry process in order to remove alcohol included in the mixed powders; a mounting step for mounting a mold filled with the mixed powders in a chamber of a spark plasma sintering device; an evacuating step for evacuating the inside of the chamber; a forming step for forming pellet until the temperature approaches the final objective temperature while increasing temperature according to the set temperature increasing pattern and maintaining constant pressure on the mixed powders in the mold; and a cooling step for cooling the inside of the chamber while maintaining the pressed pressure in the mold after the forming step. According to the manufacturing method, the method for manufacturing a pellet can manufacture a tungsten carbide-molybdenum carbide-cobalt pellet to have high density and to be suitable for a friction stir welding tool using a spark plasma sintering process and can manufacture uniform pellet of which particles are not grew in a short time in a single process and which has the uniform tissue, high toughness, high wear resistance, and high strength and without internal and external properties of matter. [Reference numerals] (120) Cooling unit; (130) Electric current supplying unit; (140) Temperature detecting unit; (150) Pump; (170) Main controller; (180) Operation unit |
