Extrusion of Spur Gear Using High-Energy Ball Milled Al-78Zn Powder

고에너지 볼밀법으로 제조된 Al-78Zn Powder를 이용한 스퍼기어의 압출

  • 김진우 (부산대학교 대학원 정밀가공시스템) ;
  • 이상진 (부산대학교 대학원 정밀가공시스템) ;
  • 이정민 (한국국제대학교 기계자동차공학부) ;
  • 김병민 (부산대학교 기계공학부)
  • Published : 2009.04.01


This paper was designed to fabricate the miniature spur gear with pitch circle of 2.25mm using extrusion process of a mechanically alloyed Al-78wt%Zn powder. The mechanical alloying of the powder particles were performed for ball milled times of 4h, 8h, 16 and 32h by the planetary ball milling. The mechanical properties of these alloyed powders, which were compacted and sintered-cylindrical preforms, were estimated using compression test. The results showed that the alloyed powder with average particle size of $10{\mu}m$ milled for 32h has the highest compressive(fractured) strength(288MPa). Extrusions of the miniature spur gear using the alloyed powder were carried out at different extrusion temperatures. Extrusion temperature of $300^{\circ}C$ provided the spur gear with the highest relative density and Vickers hardness and without any surface defects.


Powder Extrusion;Mechanical Alloying;Al-Zn Composite Powder;Miniature Spur Gear


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