定力夾持驅動裝置之平移凸輪機構設計

伴隨工具機產業的發展，產品所要求之製造精度標準不斷提高。工具機夾具對整體產業的水準提升有著極其重要的影響，為加工生產時不可少之重要環節。本文以機用虎鉗為主要應用對象，採用平移凸輪搭配肘節機構，建立系統化之流程來設計夾持驅動裝置，以實現倍力放大與定力輸出之夾持效果。文中首先透過給定之參數進行設計計算，推導平移凸輪輪廓、節曲線之向量參數式以及加工凸輪之刀具中心相對於凸輪之運動路徑向量參數式。接著對各設計參數彼此間之關聯性進行研究，最後再分析間隙對裝置輸出所造成之機械誤差，以評估本文所提出之平移凸輪定力夾持機構的特性、效能與實用性。而後本文進一步利用連桿與平移凸輪夾持機構結合，將其改良成具有自定心效果之夾持裝置，其夾持塊可以同時快速做反向且精確之等量作動，使工件中心點位置能夠維持，讓加工品質能有所提升。首先對自定心機構之輸出力作探討，並歸納可行之機構模型後，針對各參數對於設計結果之影響進行分析，以期能提供後續設計之初步建議與方向。

關鍵字

平移凸輪機構；虎鉗；定力夾持；自定心

並列摘要

Accompanied by the development of the machine tool industry, there’s an ever-rising requirement of the manufacturing precision standard for products. Clamping devices for machine tools, as an indispensable part of manufacturing, have crucial influence on the upgrading of the entire industry.In order to provide magnified constant clamping force, this work proposes systematic processes to design a clamping device applied to machine vices mainly with the combination of translating cam and toggle mechanism. The cam profiles, pitch curves, and paths of cutter are derived and expressed parametrically firstly by designing and calculating with given parameters. After a study of relationships between design parameters, an analysis of mechanism errors in the output of the devise causing by clearance has been undertaken so that the characteristics, utilities, and usefulness of the mechanism can be assessed.By combining linkages with the translating cam clamping mechanism, this work further synthesizes a self-centering clamping devise whose two clamping parts move the exact same distance in opposite direction simultaneously that can improve processing quality since it maintains the work-piece central position. Starting with the discussion of output forces of self-centering clamping mechanisms as well as summarizing feasible mechanism types, the influence of parameters on design result is then analyzed so as to propose some advices and directions while designing afterward.

並列關鍵字

Translating cam ； vice ； constant-force clamping ； self-centering

參考文獻

[22] 張文桐，2007，平面凸輪機構之機械誤差分析及其應用，博士論文，國立清華大學動力機械工程學系，新竹市，37-109頁。

[11] C. M. Yang, “Compressed air-powered driving device for vice,” Taiwan Patent M308823(U), 2006.

[15] N. Sclater and N. P. Chironis, 2001, Mechanisms and mechanical devices sourcebook, McGraw-Hill, New York, pp. 211-213.

[19] L. L. Wu, W. T. Chang, and C. H. Liu, 2007, “The Design of Varying-Velocity Translating Cam Mechanisms,” Mechanism and Machine Theory, Vol. 42, No. 3, pp. 352-364.

[25] H. Rothbart, 2004, Cam Design Handbook, McGraw-Hill, New York, pp. 5-7, 285-301, 220-221, 269-271.

國際替代計量

定力夾持驅動裝置之平移凸輪機構設計

全文下載

主題瀏覽