Please use this identifier to cite or link to this item: `http://hdl.handle.net/11455/1702`
 標題: 公差與外力對結構靜態誤差之探討Analysis of Tolerance and Force in Structure Static Error 作者: 呂泰良Lyu, Tai-Liang 關鍵字: tolerance analysis;公差分析;force analysis;mold-clamping mechanism;error analysis;受力分析;鎖模機構;誤差分析 出版社: 機械工程學系 摘要: 摘要由於工業技術的提昇，現代產品結構日趨複雜而朝向高精密化的發展 ，因此在設計上更應注意精度的設計分析與控制，如何在產品設計階段時 ，利用相關的資訊來估算產品之精度，是產品設計的重要課題，而影響精 度的主要因素包括零組件製造時產生之幾何公差、零件間之配合間隙、受 力與溫差造成的變形以及其它的外在因素，本論文以結合公差分析與受力 分析為研究之重點，探討機械結構因零組件公差累積以及結構變形所造成 之精度變化。在公差分析方面，以公差網路表示法為基礎，透過幾何公差 與配合誤差模型以及區間與統計運算法的理論，並借由公差分析軟體，計 算產品結構之幾何公差與配合間隙之誤差累積。在受力分析方面，根據力 平衡原理，針對結構之受力狀況，分析各零件所受到的外力大小及方向， 利用有限元素分析結構之受力變形，然後合成公差分析與受力分析之誤差 結果，再進一步利用該結果為基礎進行敏感度分析，將之應用在結構設計 上作為設計變更的依據，文中並以塑膠射出成型機肘節式鎖模機構作為探 討實例，說明零組件幾何公差之誤差累積以及受力變形誤差之加成效果。AbstractDue to the fast progress of industrial technology, modern product structure becomes more complex with higher precision. More attention has to be paid to the analysis and control on the accuracy of a product design. Therefore it is an important issue of design to estimate product accuracy from related information, and the main factors affect the accuracy of a machine including geometric tolerances generated in component fabrication processes, clearancesamong mating parts, deformation of force and temperature, and other externalfactors. This thesis focuses on the combination of tolerance and force analyses.It investigates accuracy variation of a structure by tolerance accumulation andby forced deformation. Tolerance analysis is based on a formal representationscheme, the tolerance network, together with error models, interval andstatistical computation methods, as well as a computer-aided tolerance analysissoftware to estimate error accumulation of geometric tolerances and fittingclearances. Force analysis is based on the principle of equilibrium. It calculatesstructure deformation by finite element analysis with forcing and boundaryconditions. Errors caused by tolerances and external forces are combined toestimate the variation of accuracy. This is further used as the foundation forsensitivity analysis that provides a guide for design modification. Themold-clamping mechanism of a plastic injection machine is used to illustratethe procedure and result of this method. URI: http://hdl.handle.net/11455/1702 Appears in Collections: 機械工程學系所