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研究生： 許鴻利
Hsu, Hong-Li
論文名稱： 銑削加工中尺寸效應對切削係數影響之探討
A study on the influence of size effect on cutting constants in milling process
指導教授： 王俊志
Wang, J-J Junz
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2002
畢業學年度： 90
語文別： 中文
論文頁數： 69
中文關鍵詞： 尺寸效應 、犁切 、比切削力 、剪切
外文關鍵詞： specific cutting force, size effect, ploughing, Shearing
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    • 本文以兩種局部銑削力推導出總銑削力之表示式來預測銑削力。其一是將影響銑削力的因子分為犁切與剪切並考慮尺寸效應，將此三項因子視為切屑厚度的函數。再將此三項與刀刃序列函數及屑寬密度函數，使用捲積的數學方法，獲得銑削力之解析式。本文將此稱為以二項式銑削力解析式。其二為以將比切削力常數表示為未變形切屑厚度的指數函數，利用數值方法建立銑削力表示式，最後進行剪切，包含剪切與犁切，二項式及指數力模式之比較。
    此外，以實驗中得到的比切削力常數，說明此係數會隨切深減少而增加，且當切深小於刀尖幾何變化點時，此項會受到刀尖幾何的影響而變大。

    Two types of milling force models are presented in this thesis. One is to separate the milling force into plowing force and shearing force considering the size effect and views these factors as the function of cut depth. The feed per tooth is viewed as a variable in milling force model to show the there factors' relation with milling force. After that, the mathematical method, convolution, is applied to combine tooth sequence function, chip width density function with three factors to get an analytical model of milling force. Another is to view the specific force and ratio of radial force to tangential force as the exponential function of cut depth. This is called exponential milling force model. Then, comparisons of shearing, shearing-ploughing, binomial and exponential force model are presented to show difference between them.
    In addition, the specific energy from experiments is presented to show this item increases with decrease of cut depth. Then form the trend of the specific energy relates to geometry of cutter tip, it is showed that the specific energy will change when the geometry of cutter contacting with workpiece varies.

    目 錄 頁次 目錄 Ⅰ 中文摘要 Ⅲ 英文摘要..................................................................................................Ⅳ 誌謝..........................................................................................................Ⅴ 圖目錄......................................................................................................Ⅵ 表目錄..................................................................................................ⅩⅠ 符號說明..............................................................................................ⅩⅡ 第一章 緒論 1 1.1 前言... 1 1.2 文獻回顧 1 1.2.1尺寸效應.............................................................2 1.2.2 端銑銑削力模式的建立..............................................................6 1.3 研究動機與目的 8 1.4 論文架構 8 第二章 端銑刀之銑削力模式 10 2.1前言 10 2.2 銑刀座標系統...................................................................................10 2.3 包含剪切、犁切及尺寸效應銑削力模式.......................................13 2.3.1 剪切、犁切及尺寸效應之分離.............................................13 2.3.2 局部銑削力............................................................................13 2.3.3 屑寬密度函數........................................................................16 2.3.4 刀刃序列函數........................................................................17 2.3.5 總銑削力................................................................................17 2.4 頻譜分析...........................................................................................19 2.5利用平均力與第一諧合力求切削力常數.........................................22 2.6 指數銑削力模式...............................................................................23 第三章 銑削加工實驗............................................................................24 3.1前言....................................................................................................24 3.2 實驗設備...........................................................................................24 3.3 端銑刀切削實驗...............................................................................26 3.3.1 實驗刀具及材料....................................................................27 3.3.2 實驗結果與多項式模式比較................................................28 3.3.3 實驗值與指數銑削力模式預測值之比較............................38 3.4 LGCC，DGCC，二項式及指數力模式之比較...............................45 第四章 銑削力與刀尖幾何關係............................................................49 4.1 前言...................................................................................................49 4.2 銑削力中之切向力與徑向力...........................................................49 4.3 比切削能及徑向與切向力比值之比較...........................................55 4.4不同每刃進給之銑削力與比切削能...........................62 4.5 銑削之尺寸效應...............................................................................64 第五章 結論與建議................................................................................65 5.1 結論...................................................................................................65 5.2 建議...................................................................................................66參考文獻 .............................................................................................67 自述........................................................................…………………….69

    參考文獻
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