摘要
雙螺帽滾珠螺桿經常使用於工具機的進給平台中，是一種使用鋼珠裝設於螺帽與螺桿之間，將傳統螺桿之滑動接觸轉換成滾動接觸，再將螺帽內的鋼珠迴轉運動轉換為直線運動的傳動機械組件。為了提高螺桿剛性，加裝過大墊片於雙螺帽之間產生預壓效果為雙螺帽滾珠螺桿的特色。 本研究利用有限元素軟體ABAQUS對雙螺帽滾珠螺桿進行動態有限元素分析，採用市售螺桿之設計規格以軟體SolidWorks建立三維模型匯入有限元軟體，定義螺桿中各元件的拘束及接觸設定。由動態模擬的結果得到螺桿系統於定轉速情況下的穩定預壓扭矩，進而將模擬結果與實驗之扭矩合理範圍比對吻合，達成模擬驗證之目標。基於此動態模擬所具備的穩定性，分別針對滾珠珠徑、螺帽偏移、轉速、軸向力等因素探討螺桿扭矩的變化並建立平均扭矩趨勢曲線。藉由螺桿有限元素模型之穩定、低耗時且調整容易之特性取代耗時且成本較高之進給系統實驗，建立符合實際運動情況的扭矩特性資料庫為本文重點。
並列摘要
The double nut ball screw , a kind of mechanical transmission suit that consists of ball bearings installed between nut and ball screw, which transfers the formal ball screw into the function of rolling con-tact from sliding contact and transfers the ball bearings motion into rectilinear from revolution in nut, is usually applied into the feeding table of machine tool. To enhance the rigidity, the characteristic of double nut ball screw is the oversize spacer installed between each side of nut, generating the effect of preload. The purpose of this study is to carry out the dynamic finite element method analysis of double nut ball screw with ABAQUS, which uses the formal module of ball screw that was imported to ABAQUS with the 3-D model generated by SolidWorks, defining the component con-tact and constraints in every part of screw. According to the dynamic simulation results, we could find the value of preload torque with stable constraint speed in screw system and infer the conclusion that correspondence between the simulation and experiment will verify the target of thesis. Based on the stability of dynamic simulation, we could construct the curve diagram of ball screw torque variation for the ball radius, nut offset , rpm and axial stress respectively. By means of the model of finite element method, which is stable, less time consuming, easy to adjust and could substi-tute for the high cost experiment, the text will focus on constructing the database measuring up to the actual motion.