Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Manufacturing Powder Extrusion Die and Experiment for Fabrication of Miniature Helical-Gears

소형 헬리컬 기어 제조를 위한 분말 압출 금형 제작 및 실험

  • 황대원 (부산대학교 대학원 정밀가공시스템) ;
  • 이경훈 (부산대학교 대학원 정밀가공시스템) ;
  • 김병민 (부산대학교 기계공학부)
  • Received : 2010.05.17
  • Accepted : 2010.07.12
  • Published : 2010.08.01
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Abstract

Extrusion process in the bulk material for fabrication of miniature helical gears has problems such as a high forming load and short tool life because the cross-section is complex and asymmetry. To overcome these problems, in this study, miniature helical gears were fabricated by Zn-22Al powder hot extrusion. The included die angle for minimum extrusion load and improving die filling was determined by FE-simulation. The Zn-22Al spheroidal powder produced by gasatomization were compacted and sintered for extrusion experiment. The dimension of helical-gear is 0.3mm in module, 3.35mm in pitch diameter, $15^{\circ}$ in helix angle and the number of teeth is 12. All of the extrusion experiments were performed with internal helical gear die which was machined by precision electric discharge machining using the electrode. The experiment was conducted at $190^{\circ}C$ to $310^{\circ}C$ to obtain extrusive and mechanical properties. The extruded helical gears were analyzed through extrusion load, Vickers hardness and SEM images for each extrusion temperature. The powder hot extrusion process was successfully applied to fabricate a miniature helical gear.

Keywords

References

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Cited by

  1. Fabrication of a Micro Die by LIGA Process and Hybrid Powder Extrusion Process of Micro-spur Gear vol.19, pp.6, 2010, https://doi.org/10.5228/KSTP.2010.19.6.352
  2. State-of-art review of past research on manufacturing of meso and micro cylindrical gears 2017, https://doi.org/10.1016/j.precisioneng.2017.07.014
  3. Fabrication of miniature helical gears by powder extrusion using gas atomized Zn–22%Al powder vol.22, pp.6, 2012, https://doi.org/10.1016/S1003-6326(11)61320-4