反應曲面法應用於鋸切參數之研究

The Analysis of Sawing Process by Response Surface Methodology

王喻民(Yu-Ming Wang)

指導教授 ： 林維新

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2010年)

摘要

針對金屬材料切斷加工之需要，帶鋸機加工技術為目前工具機產業發展趨勢之一，然而在鋸切加工中，常因為切削力的變化幅度過大或再生式顫振的產生，導致崩齒和斷帶以及切削率不高之問題，爲避免這些問題發生，可先藉由靜態與動態響應找出工具機特性，接著經由實驗設計的反應曲面法調整切削參數，將可得到良好效果。

本文主要可分為二部份，第一部分先針對帶鋸機機台做靜態敲擊試驗，藉此觀察機台的靜態響應情形，接著分析帶鋸機切削時動態響應所造成之影響，並觀察切削時整個顫振產生過程。結果發現，實驗趨勢與理論相符，顫振在速度快、小進給或是速度慢、高進給時產生。

當顫振產生時，除了對切削系統造成十分不穩定之影響，同時也大幅影響切削性能，對於此現象，可嘗試調整切削參數，使切削條件避開不穩定的切削區域，達到較穩定的切削效果；另外，亦考慮切削阻抗對於鋸齒磨損之影響。因此，本文第二部份係針對顫振抑制並企圖降低切削力為目標，把實驗的切削力與切削振幅量化，使用反應曲面法找出較佳的切削條件，並進一步探討切削力、切削振幅與切削參數間之關係，為國產帶鋸機鋸削穩定性設計提供最佳化依據。

關鍵字

再生式顫振 ； 切削力 ； 切削參數 ； 反應曲面法

並列摘要

In accordance with the need to cut off during the metal processing, band saw machine processing technology is one of the current trends in machine tool industry. However, during the sawing process, problems such as collapse gear, belt as well as low cutting rates may often happened because of the increase change of cutting force or the regenerative of chatter generation. In order to avoid these problems, first, by finding out the static and dynamic response of machine tool characteristics, then the experimental design followed by the response surface methodology can adjust the cutting parameters getting good results.

This paper can be divided into two parts. The first part focus on the static response test produced by the band saw machine. Observing the response from the case of static machine and analyzing the dynamic response of the band saw machine cutting caused by the impact. Then, analyzing the entire production process of chatter. It can be found that the experimental trends fit to the theoretical results. Chatters can be produced when it is high speed, small feed or slow speed, high feed.

When the chatters are generated, they not only cause the unstable affect to the cutting system, but also affect the cutting performance greatly. With the view to solving this phenomenon, try to adjust the cutting parameters so the cutting conditions can avoid the instability of the cutting area, and achieve to more stable cutting region. Moreover, considering the cutting wear resistance for the sawtooth effect, therefore, the second part of this paper is focus on the system for chatter suppression with an attempt to reduce the cutting force. The experiment of cutting and cutting force amplitude quantization, better use of response surface methodology the cutting conditions, and further discussion about the cutting force, cutting amplitude and the relationship between cutting parameters for the stability of domestic band saw sawing machine designed to provide optimal basis.

並列關鍵字

regenerative chatter ； cutting force ； cutting parameters ； response surface methodology

參考文獻

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