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Superplastic Microextrusion for Microgears  

Kim, Jae-Yeon (서울산업대학교 자동차공학과 대학원, 경기기계공고 공동실습소)
Joo, Se-Min (서울산업대학교 NID 융합기술대학원)
Kim, Ho-Kyung (서울산업대학교 자동차공학과)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.17, no.4, 2008 , pp. 1-7 More about this Journal
Abstract
Fine grained superplastic Zn-22%Al alloy was extruded using a laser machined micro-die to produce a micro-gear shaft. Extrusion process was conducted under a constant pressure at constant temperatures ranging from 503 to 563K. Laser machining was capable to machine a micro-die with close tolerances and adequate surface quality. The extrusion rate increased with extrusion load under constant extrusion temperature. The rate reached a steady state and became constant after a certain period. There was a small instantaneous stroke on application of the load and then a very brief primary stage which preceded steady-state flow. The micro-extrusion process was proven to produce a micro-gear shaft successfully using a fine grained superplastic Zn-22%Al alloy.
Keywords
Micro-extrusion; Micro-forming; Laser machining; Micro-gear; Superplastic alloy;
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