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研究生:謝百閎
研究生(外文):Hsieh, PaiHung
論文名稱:線切割放電旋轉工件加工監視與控制系統研發
論文名稱(外文):Development of a Monitoring and Control System for Wire Electrical Turning Process
指導教授:顏木田
指導教授(外文):Yan, MuTian
口試委員:顏木田羅勝益陳順同
口試委員(外文):Yan, MuTianLuo, ShenqYihChen, ShunTong
口試日期:2012-12-04
學位類別:碩士
校院名稱:華梵大學
系所名稱:機電工程學系博碩專班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:101
語文別:中文
論文頁數:120
中文關鍵詞:線切割放電加工機波形監視與訊號統計系統放電延遲時間旋轉工件加工模糊控制
外文關鍵詞:Wire electrical discharge turningPulse discriminating systemIgnition delay timeFuzzy logic control
相關次數:
  • 被引用被引用:2
  • 點閱點閱:296
  • 評分評分:
  • 下載下載:51
  • 收藏至我的研究室書目清單書目收藏:1
本論文目的在研發線切割放電旋轉工件加工監視與控制系統。利用新型放電波形監視與訊號統計系統,分類放電波形與計算放電延遲時間,探討旋轉工件加工的放電波列與延遲時間的特性,分析波形參數與金屬移除率之關係曲線,實驗探討旋轉加工中同動與非同動的加工特性,歸納出電弧放電比例與放電延遲時間,可作為監視與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。在旋轉軸非同動伺服進給加工模式下,進給速率增加時,旋轉軸以固定速率旋轉,線極與工件間的側向間隙會受到影響,造成側向間隙減小,相對的間隙電壓會快速降低,容易造成短路退刀,在適應性控制方面使用模糊控制法則,以電弧放電比例與放電延遲時間為迴授訊號藉以調整進給速率與放電休止時間,經由針對旋轉加工發展出模糊控制系統進行同動與非同動加工驗證,最後的實驗結果,能使在非同動旋轉加工下加工速率達到0.19 mm/min,進給變動量維持在 ±0.01mm/min的範圍內,與有經驗操作者在等速進給加工模式下,加工速率設定0.1 mm/min比較,效率提升90%,在同動旋轉加工下加工速率達到47 mm/min,進給變動量維持在±1 mm/min的範圍內,與有經驗操作者在等速進給加工模式下,加工速率設定30 mm/min比較,效率提升56.6%,驗證了在不同的旋轉加工模式下,本文所設計的適應性控制系統皆能達到最佳加工效益及穩定加工的效用。
This paper presents a new pulse discriminating and adaptive control system for process monitoring and control of wire electrical discharge turning (WEDT) process. The pulse discriminating device including a spark gap monitor and a digital signal processor (DSP) card has been developed to identify spark gap states and compute ignition delay time. The relation between the proportion of open circuit, normal spark, arc discharge, short circuit in the total sparks (defined as open circuit ratio, normal spark ratio, arc discharge ratio and short circuit ratio, respectively), ignition delay time and metal removal rate were experimentally investigated during the WEDT process. Through pulse train analysis, arc discharge ratio and ignition delay time can be used as sensing parameters for process monitoring and control. For cylindrical wire electrical discharge turning process, machining feedrate is adjusted by servo feed control to keep forward sparking gap at a proper width. However, the servo feed control system fails to respond to the variation of lateral gap width due to a constant spindle speed. A fuzzy logic controller is designed to control both the arc discharge ratio and ignition delay time at a predetermined level through an on-line regulation of federate and pulse off-time for adaptive process control. Experimental results show that the developed adaptive control system results in faster machining and better machining stability than does a conventional control scheme for the WEDT process.
摘要
Abstract
目錄
圖錄
表錄
第一章 緒論
1.1引言
1.2文獻回顧
1.2.1 放電波型分類
1.2.2 放電波列行為分析
1.2.3 放電加工控制應用
1.2.4旋轉工件加工研究
1.3動機與目的
1.4本文結構
第二章 放電加工技術
2.1放電加工原理
2.1.1 放電現象說明
2.1.2 放電的基本轉換過程
2.1.3 放電火花結構
2.2放電電源系統
2.2.1 依放電迴路分類
2.2.2 依放電能量分類
2.2.3線切割放電加工機之電源系統
2.3 線切割放電加工特性
2.3.1加工速度
2.3.2加工精度
2.4加工參數變化的影響
第三章 放電波形監視與訊號統計系統
3.1放電波形量測電路
3.2放電波形鑑別電路
3.2.1 放電波形分類
3.2.2 放電波形鑑別
3.2.3 放電波形鑑別電路之設計
3.3放電波形訊號與放電延遲時間統計
3.3.1 放電波形統計程式之設計
3.3.2 放電波形與放電延遲時間統計之實現與驗證
3.4 完整系統整合之實現與加工測試
3.4.1系統整合
3.4.2系統加工測試
第四章 實驗設備介紹
4.1實驗設備
4.1.1 線切割放電加工機(Wire-EDM Machine)
4.1.2 NC旋轉平台
4.1.3 個人電腦
4.1.4數位示波器(Oscilloscope)
4.1.5電流量測系統( Current Probe System )
4.1.6電壓差動探棒
4.1.8 EPM1270T144複雜型可規劃邏輯晶片(CPLD)
4.1.9 PMC32-6000 PCI BUS 六軸運動控制卡
4.1.10 Code composer與XDS510PP模擬器
4.1.11 Borland C++ Builder 5.0
4.1.12 電極材料
4.1.13加工液
4.1.14 工件材料
第五章 旋轉工件加工特性研究
5.1非同動旋轉加工對放電波列與放電延遲時間之影響
5.1.1等速進給加工實驗
5.1.2伺服進給加工實驗
5.1.3圓半徑誤差Δr=0.92mm工件等速進給加工
5.1.4非同動旋轉加工特性探討
5.2同動旋轉加工對放電波列與放電延遲時間之影響
5.2.1等速進給加工實驗
5.2.2伺服進給加工實驗
5.2.3同動旋轉加工特性探討
第六章 線切割放電加工機 旋轉工件加工模糊控制系統
6.1放電旋轉加工模糊控制系統
6.2模糊邏輯控制器
6.2.1 模糊化
6.2.2 模糊規則庫
6.2.3 模糊推論機構
6.2.4 解模糊介面之建立
第七章 實驗結果與討論
7.1非同動旋轉工件加工模糊控制實驗
7.1.1 實驗規劃
7.1.2 非同動旋轉工件加工模糊控制實驗
7.1.3非同動旋轉工件加工控制比較
7.2同動旋轉工件加工模糊控制實驗
7.2.1實驗規劃
7.2.2同動旋轉工件加工模糊控制實驗
7.2.3同動旋轉工件加工控制比較
第八章 結論與建議
8.1研究結論
8.2研究建議
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