應用拓樸最佳化於工具機底座結構之研究

The Research for The Base of Machine Tool by Topology Optimization

盧人菖(JEN-CHANG LU)

指導教授 ： 劉德騏

國立中正大學/工學院/機械工程學系/碩士(2016年)

摘要

在結構設計時，結構輕量化用以解決各種成本問題；輕量化後，設計者將設計肋板補強結構以確保結構剛性，因此如何設計肋板結構是設計者的一大學問。由於產品功能性多樣化之要求以致於結構趨於複雜化，依經驗法則不易設計出對應之高剛性結構；近來電腦技術發達與有限元素分析軟體之進步，拓樸最佳化工具可協助設計出可靠的結構幾何外形。本研究利用拓樸最佳化方法於工具機底座結構設計，首先利用拓樸最佳化搭配有限元素分析獲取底座結構初始幾何外形，接續考量鑄造木模實際製程之可行性進行結構設計，並增加結構支撐數量來改善結構靜、動態剛性，以及研究結構之移動件與固定件重量比例對結構靜、動態剛性之影響，最後針對改善結構振動問題，設計可填充人造花崗岩之鑄鐵框架結構。透過本研究可協助無設計經驗之設計者，設計出可製造並且結構剛性佳之結構。

關鍵字

拓樸最佳化 ； 有限元素分析 ； 木模製作可行性 ； 工具機

並列摘要

In the structural design process, the lightweight structure was utilized to solve any kind of cost problem. Generally, the rib structure was designed to reinforce the whole structure. Therefore, it is a major problem how to design the rib structure for structure engineer. The geometry and shape of structure become more complicated because of the demand of product functional diversification. It is difficult to design the high-stiffness structure according to the rules of thumb. Nowadays, the improvement of computer technology and finite element analysis (FEA) software make the structure engineer available to design the reliable structure geometry and shape by the method of topology optimization.
This study adopts the topology optimization method to design the base structure of machine tool. First, the prototype of the base structure was acquired through the coupling FEA analysis and topology optimization. Then, the feasibility of the wood pattern of casting was taken into consideration to design the detailed structure geometry. Furthermore, we add the support structure to improve the dynamic and static stiffness. The influence of the ratio between the mobile and fixed parts for the dynamic and static stiffness of structure was studied. Finally, the cast-iron frame structure available to fill with artificial granite was designed to reduce the problem of structure vibration. This study can help structure designer with no experience design the manufacturable and high-stiffness structure.

並列關鍵字

Topology optimization ； finite element analysis ； the feasibility of the wood pattern of casting ； machine tool

參考文獻

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