電腦輔助工程在CNC立式加工中心機進給系統高速化之應用

Enhancing the Performance of the Feed-Drive System in a Vertical Machining Center

陳俊達(Chun-Ta Chen) ； 王焜潔(Kun-Chien Wang) ； 周信暐(Shinn-Woei Chou)

《科學與工程技術期刊》 3卷1期 (2007/03) Pp. 77-85

https://doi.org/10.7117/JSET.200703.0077

摘要

未來全球工具機將朝高速化、高精密度化、自動化、環保化之方向發展。而首要之高速化，乃指高速加工；以一立式加工中心機而言，涵蓋主軸之高轉速化，進給系統高速化及換刀速度高速化。國內目前技術水準，主軸轉速約20000rpm，進給速度約30m/min，換刀速度約1秒(tool to tool)，離歐美日等國尚有段距離，尚需投入大量之研發。本研究之目的即在於研究改善國內工具機廠外銷產量很大之泛用中型立式加工中心機之進給速度，使刀具花費於G00快速進給之時間縮短；內容針對床台結構、滾珠螺桿導程、進給伺服馬達特性、各部機件摩擦及其剛性等要素，進行靜、動態特性分析，研究其對於進給速度之影響，藉由分析結果歸納出立式加工中心機進給速度提昇之確切方法，並同時提供予廠商作為改良之依據。

關鍵字

工具機 ； 立式加工中心機 ； 高速切削 ； 高速進給

並列摘要

The future strategic development of CNC (computer numerical control) machine tools is towards high speed, high precision, automation production, and environmental protection. Among these techniques, high speed is the most important. In machining, the term ”high-speed” describes the rotation rate of the spindle, the movement of the feed-drive system, and the rate at which the tools change. Currently, the manufacturing level in Taiwan has reached about 20,000 rpm for the spindle, 30mm/min for the feed-drive system, and one second per tool-to-tool change, rates far behind Europe and the USA. Much time, money, and additional institutes for conducting research on new techniques for developing new models of machine tools are now needed. This study sought to enhance the feeding velocity of a feed-drive system in a CNC vertical machining center in order to decrease the moving time of the cutting tool in the command G00. The static and dynamic responses to the rigidity of the bed structure, the lead of the ball screw, the servo-motor parameters, and the friction effects were analyzed in detail. Optimum methods for increasing the feeding velocity were found. The results can contribute to the improvement of the performance of a CNC vertical machining center.

並列關鍵字

machine tools ； vertical machining center ； high-speed machining ； high-speed feeding