臺灣博碩士論文加值系統

本論文之目的在探討微線切割式放電加工適應控制之研究。文中先利用本實驗室所發展出微線切割放電加工之放電波形鑑別系統，分類放電波形及探討各種加工參數之放電波列行為。量測參數與金屬去除率之關係曲線，歸納出放電頻率與短路放電比例等資訊，可做為監視和評估間隙放電狀況之狀態變數與系統控制變數以提供控制應用所需的放電狀態資訊。本文提出以自組織自我學習式模糊滑動控制器之控制策略，應用於間隙電壓控制迴路與PI控制器之實驗結果比較，證明不論穩態進給變動量及加工速率均獲得改善，而適應性控制方面則利用模糊控制器以短路波百分比調整伺服參考電壓，並利用放電波形鑑別系統所分類出不正常放電波，透過CPLD控制脈波時序即時調整放電休止時間。使整個系統能即時反應加工狀況，維持良好加工穩定性。在適應控制實驗方面包括靠邊加工、錐度加工與隅角等加工條件，與一般PI控制器之實驗結果比較，加工狀況方面靠邊加工部份能大幅改善線與工件剛接觸之情形，錐度加工部份可以克服加工不穩定之情形，隅角加工部份可抑制轉角時斷線之危機，加工性能方面暫態響應部份可從原本50秒提升至30秒左右達到穩態，穩態進給變動量從±0.006 mm/min改善至±0.002 mm/min，加工速率從0.08 mm/min可提升至0.11 mm/min。

This paper presents an adaptive control system for process monitoring and control in micro wire-EDM. By means of the developed pulse discriminating system, the effect of table feedrate on the variations of the proportion of normal spark, arc discharge and short circuit in the total sparks (defined as normal ratio, arc ratio and short ratio, respectively) were investigated experimentally. The developed system is performed in hierarchical structure of two control loops by using fuzzy control strategy. In the first control loop, a fuzzy sliding mode controller with self-organizing learning algorithm is implemented for gap voltage control. In the second control loop, the short ratio is regulated at a predetermined level by using fuzzy control strategy for optimal process control. Pulse interval of each spark is real-time adjusted according to the identified gap states to achieve stable machining. Experimental results indicate that the developed control system can reduce the possibility of wire rupture maintain stable machining under the machining conditions where the instability of machining operation and wire rupture are prone to occur. Machine federate was improved from 0.08 mm/min to 0.11 mm/min and its variation was reduced from ±0.006 mm/min to ±0.002 mm/min compared to the commonly used gap voltage control system.

目錄
摘要 Ⅰ
Abstract Ⅱ
目錄 Ⅲ
表錄 Ⅶ
圖錄 Ⅷ
第1章 緒論 1
1.1 引言 1
1.2 文獻回顧 3
1.2.1 放電波形分類相關文獻3
1.2.2 放電波列行為分析相關文獻4
1.2.3 放電加工控制應用相關文獻5
1.2.4 模糊邏輯控制應用於放電加工相關文獻6
1.3 研究動機與目的 9
1.4 本文結構 10
第2章 放電加工技術 11
2.1 放電加工原理 11
2.1.1 放電現象說明 11
2.1.2 放電的基本轉換過程 12
2.1.3 放電火花之結構13
2.2 放電電源系統 16
2.2.1 依放電迴路分類 17
2.2.2 依放電能量分類 18
2.2.3 線切割放電加工機之電源系統 19
2.3 線切割放電加工特性 21
2.3.1 加工速度 21
2.3.2 加工精度 22
2.4 加工參數變化的影響 23
第3章 放電波形監視與脈波控制 28
3.1 放電波形量測電路 28
3.2 放電波形鑑別電路 31
3.2.1 放電波形鑑別策略 32
3.2.2 放電波形鑑別電路與程式之設計 34
3.3 放電條件控制電路 36
3.3.1 放電休止時間控制訊號之設計 36
3.3.2 放電休止時間控制訊號之實現與驗證 36
3.4 完整系統整合之實現 39
第4章 相關控制理論與控制器設計 41
4.1 放電加工適應性控制系統 41
4.2 模糊邏輯控制器 44
4.2.1 模糊控制器之建立方法與步驟 44
4.2.2 模糊化 44
4.2.3 模糊規則庫 45
4.2.4 模糊推論機構 45
4.2.5 解模糊化介面之建立 45
4.3 滑動模式控制器 46
4.4 自組織模糊滑動模式控制器 48
4.4.1 自組織學習法則 48
4.4.2 自組織模糊滑動模式控制器設計 50
4.5 控制器參數 53
第5章 實驗設備與實驗規劃 56
5.1 實驗設備 56
5.2 實驗規劃 68
5.2.1 放電加工條件對放電波列變化之探討 68
5.2.2 微放電伺服進給控制實驗 68
第6章 實驗結果與分析 69
6.1 加工速度對放電波列之影響 69
6.2 伺服進給加工實驗 72
6.2.1 使用PI控制法則 72
6.2.2 使用自組織模糊滑動模式控制法則 73
6.2.3 控制性能分析與討論 75
6.3 適應性控制加工實驗 75
6.3.1 靠邊加工 76
6.3.2 錐度加工 81
6.3.3 隅角加工 85
6.4 實驗結果比較及討論 90
第7章 結論與建議 92
參考文獻 94

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