超音波振動輔助多道次等通道彎角擠製之研究

廖佑懷(You-huai Liao)

指導教授 ： 葉維磬

國立中央大學/工學院/機械工程學系/碩士(2014年)

摘要

本文探討超音波振動對於多道次等通道彎角擠製(multi-pass ECAE)之效應。藉由改變沖頭軸向超音波振幅進行三種路徑(Route A、B、C)的四道次ECAE擠製，觀察沖頭負載與擠錠機械性質之效應。並以有限元素模擬軟體Deform-3D分析多道次之成形負載驗證與超音波振動沖頭負載之變化。實驗結果顯示超音波振動對於降低ECAE成形負載有良好的效果，軸向超音波加載可使擠錠之硬度略微提升，並且可以大幅改善路徑B的硬度均勻性。有限元素模擬結果顯示，應用Deform-3D模擬分析超音波振動輔助與多道次ECAE之結果與實驗之結果具有良好的相似性。

關鍵字

超音波 ； 等通彎角擠製 ； 路徑

並列摘要

This paper investigates the axial ultrasonic vibration assisted multi-pass equal channel angular extrusion by experiment and FEM simulation.
Experimentally change three different route (Route A, Route B and Route C) and ultrasonic applied or not to investigate the forming load, billet's hardness and surface roughness.
Experiment results show that application of ultrasonic vibration can make reduction of forming load of multi-pass ECAE processes. While in the condition of route B and route C, ultrasonic vibration make billet's hardness distribution more uniformly.
Furthermore, using FEM software Deform-3D to simulated load-stroke curve and load were also compared with the experimentally recorded load-stroke curve and load. Simulation results show that good conformity is observed between the FEM simulation and experimental results.

參考文獻

[1] Segal V.M. (1995), “Materials processing by simple shear”, Materials Science and Engineering: A 197, 157-164

[2] Furukawa, M., Iwahashi, Y., Horita, Z., Nemoto, M., & Langdon, T. G. (1998). “The shearing characteristics associated with equal-channel angular pressing.” Materials Science and Engineering: A, 257(2), 328-332.

[3] Furukawa, M., Horita, Z., & Langdon, T. G. (2002). “Factors influencing the shearing patterns in equal-channel angular pressing.” Materials Science and Engineering: A, 332(1), 97-109.

[4] Sun, P. L., Yu, C. Y., Kao, P. W., & Chang, C. P. (2002). “Microstructural characteristics of ultrafine-grained aluminum produced by equal channel angular extrusion.” Scripta materialia, 47(6), 377-381.

[5] Sun, P. L., Kao, P. W., & Chang, C. P. (2004). “Effect of deformation route on microstructural development in aluminum processed by equal channel angular extrusion.” Metallurgical and Materials Transactions A, 35(4), 1359-1368.