臺灣博碩士論文加值系統

在過去數十年間工具機技術越來越成熟，在加工上應用越來越廣泛。傳統加工參數設定，通常以固定轉速或固定進給率進行加工，為避免造成刀具或機台損壞，在進給率的選擇上會以最嚴苛之條件進行設定，因此在加工時並非是最有效率的加工，而藉由適應性控制以變動進給率來維持等切削力進行加工，可以提高生產效率。
目前雖已有很多對適應性控制切削力的研究，但在建立動態系統的過程都較為複雜，通常沒有包含實際進行切削時的動態特性，故本研究是以較簡單的方法建立包含切削過程之動態系統為研究目的。除此之外，目前大部分的研究中量測切削力的訊號是使用動力計，但動力計價格昂貴且占空間，使加工受到諸多限制，故本研究擬利用主軸電流訊號取代動力計。
本研究建立切削時動態特性系統之方法為使用掃頻實驗的方式，對實驗中擷取的主軸電流訊號經過處理後進行系統鑑別來獲得代表此系統之轉移函數，透過此轉移函數設計一控制器並利用電流訊號進行等切削力控制之實驗驗證掃頻方式獲得切削動態系統的可行性。

During past decades the techniques of computer numerical control (CNC) machining centers has grown tremendously and their applications has expanded rapidly. Traditionally the operating parameters such as spindle speed or feed rate are prescribed conservatively by experienced technicians in order to protect the cutting tool or the machine. As a result, many processes run under inefficient operating conditions. For this reason, using adaptive constant cutting force control with adjustable feed rate can improve efficiency.
Although there are already many researches for adaptive cutting force control, their methods of establishing dynamic systems are complicated and seldom take actual cutting dynamic characteristics of cutting process. The purpose of this study is to identifying cutting dynamics with consideration of actual cutting dynamic characteristics during cutting process in a simple way. Besides, most researches use dynamometer to measure cutting force, but dynamometer is expensive and limiting the working space. This study will use spindle current instead of cutting forces from dynamometer as input signals.
In this study, we establishes cutting dynamic characteristic system by using sweep experiment. By using system identification with spindle current data to get a transfer function of system, we can design a proper controller based on this transfer function and verify the feasibility of constant cutting force control with spindle current.

口試委員審定書 I
致謝 II
中文摘要 III
Abstract IV
目錄 V
圖目錄 X
表目錄 XIII
第一章、緒論 1
1.1研究背景 1
1.2研究動機與目的 2
1.3論文架構 5
第二章、文獻回顧 6
2.1適應性控制 6
2.1.1 Adaptive Control with Optimization 6
2.1.2.Adaptive Control with constraints 6
2.1.3 Geometric Adaptive Control 8
2.1.4小結 8
2.2動態系統建立 8
2.2.1.理論推導方式 8
2.2.2. MRAC 11
2.2.3. 逆增益值 11
2.2.4.其他方法 11
2.2.5.小結 12
2.3訊號量測方式 12
2.3.1動力計訊號 12
2.3.2電流訊號 13
2.3.3小結 16
第三章、研究方法 18
3.1研究架構 18
3.2建立切削時的動態系統 19
3.2.1輸入訊號 20
3.2.2系統鑑別 22
3.3設計PID控制器 24
3.4電流訊號與切削力轉換 26
3.5實驗驗證 28
第四章、實驗設備架構與規劃 29
4.1簡介 29
4.2實驗架構與設備 29
4.3實驗規劃 40
4.3.1掃頻實驗設計 40
4.3.2掃頻資料範圍選取 42
4.3.3適應性控制等切削力驗證之實驗設計 44
第五章、實驗結果與討論 46
5.1微動力計訊號分析 46
5.2電流訊號分析 51
5.3PID控制結果討論 56
5.3.1控制器設計 56
5.3.2適應性控制結果討論 61
第六章、總結與未來展望 68
6.1總結 68
6.2未來展望 68
參考文獻 69

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