本文主要是研究裝設在挖土機前端的大鋼剪剪切機構，該機構主要用於剪切廢鋼料及搬運作業，而整體機構可分為二個部份，可動部與固定部，且各自分別裝設三片刀塊以螺栓銜接固定。本研究先以3D繪圖軟體Pro/Engineer設計各組件模型樣本及尺寸，在可動部的第一、二、三刀塊端點及中點，選定六個接觸點ABCDEF相對應在固定部上的接觸點A´B´C´D´E´F´來進行模擬一個完整的剪切動作。其次，根據KOMATSU型號PC340 LC-7挖土機所提供的90 %最大破壞力，推求各個接觸點的外力值及適當的邊界條件。最後，導入有限元素分析軟體ANSYS，分析各零組件的應力分布情形以評估結構安全性，此外，本文也執行最佳化分析計算可動部與固定部的設計變數，以達到節省成本與減重的目的。

In this thesis, the steel cutter installed at the end of the arm of the hydraulic excavator is studied. The steel cutter is used as a cutting and grappling metal-scrap machine. The whole machine consists of two parts, moving chopper part and fixed base part. Each of them are installed by three blades, which are fixed by the bolts. The first part of the research procedure is using the 3D graphical software Pro/Engineer to design every component models and set up the dimensions. Six contact points of ABCDEF on base part with the corresponding contact points of A´B´C´D´E´F´ at the extreme point and midpoint of the 1st blade, 2nd blade, and 3rd blade of the chopper part, are selected to simulate a whole cutting movement. Next, by considering a 90% breakout force of the KOMATSU PC340 LC-7 hydraulic excavator, the forces acting on every contact points and proper boundary conditions are determined. Finally, the FEM software ANSYS is used to analyze the stress distribution of every components and estimate the structure safety. Besides, by executing the optimal analysis to calculate the design variables of the chopper part and base part, the cost and weight of the steel cutter can further be reduced.

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