工具機RMV250RT性能改善提案

本報告目的是探討及改善捷力精密機械之多面加工機RMV250RT加工精度，此機台對Y軸滑座剛性要求較高，因此本文提案針對關鍵性主軸頭提出改進方案以提升性能表現，本文針對3項已知問題提出改善提案，於第2章列出所發現問題，其中問題一在循圓測試中許多樣本在負Y端有明顯誤差；問題二是在Y軸軸向雷射補償圖中，有顯著起伏波動；問題三是補償螺桿背隙後，雷射來回路徑數值出現交叉造成補償困難。報告第3章針對以上各個問題提出可能原因，並提出針對最有可能原因的應對方案。其中針對問題一所出現循圓測試的誤差，本文使用有限元素法設計一懸臂結構，並與現有以及舊有改進提案比較；針對問題二在Y軸軸向雷射補償圖中的起伏波動。本文認為使用徑向抗扭矩能力的配置能改善此問題；而問題三是雷射來回路徑數值出現交叉現象，本文建議更動傳動設計，減少額外力矩產生，並以有限元素法探討更動設計對結構強度影響。

關鍵字

刀具偏移；結構剛性；滑塊跨距；加強肋截面形狀；懸臂式主軸頭

並列摘要

The purpose of this report is to discuss and improve the processing accuracy of the multi-face processing machine RMV250RT of AKIRA-SEIKI Precision Machinery. This machine has high requirements for the rigidity of translation along the Y-axis. Therefore, improvement plans on the key spindle head is proposed to upgrade its performance. Three known problems are discussed and improvement plans are proposed. The problems founded are stated in Chapter 2. Among them, problem one is that many samples have obvious errors at the negative Y end during the circular test. Problem two is that significant fluctuations appear in the Y axis axial laser compensation map. The third problem is that after compensating for the screw backlash, the laser paths cross, which makes it difficult for further compensation. In chapter 3 of the report possible causes for the above problems are suggested and possible solutions are proposed. In response to the error of the circular test in question 1, finite element method is used to design a cantilever structure, and comparisons to the existing and an previous improvement proposals are made. For the fluctuation of the second problem in the Y-axis axial laser compensation diagram, the author suggest to use radial anti-torque capability configuration to deal with this problem. For the third problem in laser path crossing phenomenon, the author proposes to change the transmission design to reduce the generation of additional torque. The structural strength of the modified design are verified with finite element method in this article.