DC 欄位 值 語言 DC.contributor 機械工程學系 zh_TW DC.creator 陳昱樺 zh_TW DC.creator Wu-Hua Cheng en_US dc.date.accessioned 2013-8-29T07:39:07Z dc.date.available 2013-8-29T07:39:07Z dc.date.issued 2013 dc.identifier.uri http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=100323087 dc.contributor.department 機械工程學系 zh_TW DC.description 國立中央大學 zh_TW DC.description National Central University en_US dc.description.abstract 本文旨探討超音波振動輔助等通道彎角擠製(ECAE)之影響，以新設計之軸向超音波沖頭加載於ECAE製程中，分別探討不同的沖頭速度與軸向振幅大小，對ECAE後加工成品之影響，其包含沖頭負載、硬度與晶粒細化程度，並以有限元素軟體Deform 3D 模擬超音波輔助ECAE，分析其等效應變與沖頭負荷之變化。結果顯示超音波軸向振動對於降低成型力、晶粒細化分布、硬度分布以及應變分佈有良好的效應。 zh_TW dc.description.abstract This paper investigates the influence of ultrasonic vibration on equal channel angular extrusion (ECAE),by designing a punch with axial ultrasonic vibration in ECAE process,to investigate punch load ,hardness,and gain size of workpiece in different punch speed and amplitude.Furthermore,using FEM software DEFORM 3D to create finite element model with axial ultrasonic vibration in ECAE process, the strain distribution can be more easier to understand through the finite element model. The results reveals that there were good improvements of reduction of forming load,grain refinement distribution, hardness distribution ,and strain distribution by imposing ultrasonic vibration during ECAE process. en_US DC.subject 超音波 zh_TW DC.subject 等通道彎角擠製 zh_TW DC.subject 擠製 zh_TW DC.subject Ultrasonic Vibration en_US DC.subject ECAE en_US DC.subject extrusion en_US DC.title 超音波振動輔助等通道彎角擠製之初步研究 zh_TW dc.language.iso zh-TW zh-TW DC.type 博碩士論文 zh_TW DC.type thesis en_US DC.publisher National Central University en_US