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| 題名: | 運用空氣冷卻系統於車削鈦合金過程中刀具溫度與表面粗糙度之建模與分析
Modeling and analyzing the effects of air-cooled turning on the machinability of Ti–6Al–4V titanium alloy using the cold air gun coolant system |
| 作者: | 洪振銘 |
| 貢獻者: | 精密機械與製造科技研究所 |
| 關鍵詞: | 建模
空氣冷卻
切削溫度
表面粗糙度
鈦合金 |
| 日期: | 2013-07
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| 上傳時間: | 2013-11-18T07:43:08Z
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| 摘要: | 本文對Ti-6Al-4V合金在車削過程中，進行建模和分析其空氣冷卻對加工性能、刀具溫度與表面粗糙度的影響。在實驗中使用Cold Air Gun系統，是使用噴射式的壓縮冷空氣來冷卻車削過程。在實驗研究中，選擇切削速度、進給速度和切削深度等加工參數為數值因素。而冷卻方法做為分類因素。實驗設計上採用四個因素D-optimal設計法來規劃實驗研究。反應曲面法(response surface methodology, RSM)的數學模型用來進行建模和分析其車削過程中其空氣冷卻對刀具溫度和表面粗糙度的影響。車削過程中使用壓縮空氣冷卻會比乾式切削更容易滲透到切削區域。實驗結果顯示，使用空氣冷卻會造成較低的刀具溫度，並降低刀具的磨損，而產生良好的加工表面。若車削中採用空氣冷卻方式來進行車削加工Ti-6Al-4V鈦合金，其加工性能會優於乾式切削。但是使用空氣冷卻方式進行車削加工過程中容易產生皺摺和斷裂式的切屑。總體而言，與乾式切削互相比較，採用空氣冷卻方式進行車削加工是有效率地另一種選擇的方式。
This study provides the mathematical models for modeling and analyzing the effects of air-cooling on the machinability of Ti–6Al–4V titanium alloy in the hard turning process. A cold air gun coolant system was used in the experiments and produced a jet of compressed cold air for cooling the cutting process. The air-cooling process seems to be a good environment friendly option for the hard turning. In this experimental investigation, the cutting speed, feed rate and cutting depth were chosen as the numerical factor; the cooling method was regarded as the categorical factor. An experimental plan of a four-factor (three numerical plus one categorical) D-optimal design based on the response surface methodology (RSM) was employed to carry out the experimental study. The mathematical models based on the RSM were proposed for modeling and analyzing the cutting temperature and surface roughness in the hard turning process under the dry cutting process and air-cooling process. Tool wear and chip formation during the cutting process were also studied. The compressed cooling air in the gas form presents better penetration of the lubricant to the cutting zone than dry cutting process. Results show that the air-cooling significantly provides lower cutting temperature, reduces the tool wear, and produces the best machined surface. The machinability performance of hard turning Ti–6Al–4V titanium alloy on the application of air-cooling is better than the application of dry cutting process. This air-cooling cutting process easily produces the wrinkled and breaking chips. Consequently, the air-cooled cutting process offers the attractive alternative of the dry cutting in the hard turning process. |
| 描述: | 指導教授:江可達 |
| 顯示於類別: | [機械工程系(含精密機械與製造科技碩士班)] 學位論文
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