Micro-Extrusion for a Gear Shaft

C.E LEE; W.T. Hwang; H.K. Kim

doi:https://doi.org/10.14445/22315381/IJETT-V68I4P203S

Research Article | Open Access | Download PDF

Volume 68 | Issue 4 | Year 2020 | Article Id. IJETT-V68I4P203S | DOI : https://doi.org/10.14445/22315381/IJETT-V68I4P203S

Micro-Extrusion for a Gear Shaft

C.E LEE, W.T. Hwang, H.K. Kim

Citation :

C.E LEE, W.T. Hwang, H.K. Kim, "Micro-Extrusion for a Gear Shaft," International Journal of Engineering Trends and Technology (IJETT), vol. 68, no. 4, pp. 13-17, 2020. Crossref, https://doi.org/10.14445/22315381/IJETT-V68I4P203S

Abstract

A micro-extrusion machine has been developed, and micro-dies were fabricated by laser micro-machining. The extrusion process was conducted under constant pressure at constant temperatures ranging from 503 to 563K. Micro-gear shafts with gear dimensions of 0.1 in module and 800 μm in pitch circle diameter were extruded using fine grained superplastic alloy. In micro-extrusion, the tool surface roughness and lubrication influence the forming behavior and produce a threshold in punch load. The extrusion load increases with extrusion rate under constant extrusion temperature. For the results of micro-extrusion simulation with friction coefficient of 0.3 at 563K, the maximum stress is almost 90% of the maximum effective stress from the experimental result. The difference between the simulation and experimental results is due to the neglect of size effects. The micro-extrusion process was proven to successfully produce a micro-gear shaft using a fine grained superplastic alloy.

Keywords

Superplastic, Micro-di, Micro- extrusion, Micro-gear, Micro-forming

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