Title

應用最佳化探討線性滑軌矯直真直度之模擬分析

Translated Titles

Utilized optimization methods for the straighten flatness of linear stages

Authors

陳聖傑

Key Words

真直度 ; straighten

PublicationName

中興大學精密工程學系所學位論文

Volume or Term/Year and Month of Publication

2007年

Academic Degree Category

碩士

Advisor

林明澤

Content Language

繁體中文

Chinese Abstract

真直度的良窳是傳動裝置的根本,當型材經過塑性成形加工,因為摩擦力、熱變形的影響導致真直度的喪失,而無法達到使用的精度,因此矯直加工是必要程序,矯直加工有壓機矯直法、回轉矯直法和滾子矯直法等,其中滾子矯直法有成本低廉、穩定性高和效率高的特性,而影響滾子矯直法的參數有滾子擠入量、滾子半間距、滾子半徑…等,因此探討設計之參數以提高真直度的研究已成為重要的課題。 本論文針對滾子擠入量和滾子半間距進行研究,首先依據理論設定合理的邊界條件,在條件中設定等距的條件變異,利用有限元素軟體ANSYS LS-DYNA進行模擬,所得結果取均方根以判斷誤差值,將各條件產生的均方根值利用Radial-Basis function建立反應曲面,再使用廣域搜尋法尋求最佳的條件參數。 以有限元素法模擬矯直程序可以減少材料耗損、快速得到結果,配合類神經網路具有高度非線性運算的特性,可以建構其數學模型,DIRECT提供快速正確的搜尋能力,其搜索可以避免陷入局部最小值的問題,完成全域最小值的尋找;經由本研究之模擬得到型材矯直之最佳設計參數,型材可以達到最佳的真直度。

English Abstract

The degree of straightness is one of the most important parameter for the linear transmission. During the manufacturing processes, deprivation of precision happens because of the frictional force, heat deformation that cause the forfeiture of straightness. Thus, it is essential to make sure that the degree of straightness is satisfied after processes. Some of the methods that have been used in the straightening process are press straightening method, roll straightening method and levelling straightening method, ... . Among these methods, levelling Straightening method has the advantages due to its low cost, high stability, and high efficiency. However, levelling Straightening method can be affected by roller intermesh, roller half-distance, roller radius…etc. Therefore, it is important to study these parameters to promote the efficiency and straightness of the process. This thesis studied the relationship between roller intermesh and roller half-distance as the break through for the design optimization of the transmission plat for straight. We first set up reasonable boundary conditions according to the theory, then set up the equidistant condition to make a variation. By utilizing the Finite Element Analysis software, ANSYS LS-DYNA, we can determine the error value by performing root-mean-square on the simulation results. Finally, by applying Radial-Basis function with the root-mean square values to construct a response curve,then the optimal parameter can be derived from the global optimization. Using Finite Element Analysis to simulate the straightening process has the advantages of reducing material consumption and fast results. With the high-speed non-linear calculation characteristics of Artificial neural network (semi-neural network), the mathematical model can be built rapidly. DIRECT offers fast and correct search capability; its search can avoid having the problems of local-minima and return the true minima. Utilized the above mention methods, we found that the processes material can achieve the best straightness .

Topic Category 工學院 > 精密工程學系所
工程學 > 工程學總論
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