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<h1 id="動力計實驗sop">動力計實驗SOP</h1>
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<p>以動力計擷取三方向力量,並計算銑削力係數。</p>
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<h2 id="動力計設置拍照">動力計設置拍照</h2>
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<p>架好實驗設備後,分別用手推XYZ三方向,同時觀察動力計輸出是否正確。</p>
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<p>此過程需拍照或攝影,畫面中要同時有動力計輸出及手推。</p>
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<p>確保動力計的接線正確、正負號正確,方便追朔實驗現場。</p>
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<h2 id="刀具">刀具</h2>
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<p>刀具需採用無圓角端銑刀。刀具參數建議:</p>
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<ul>
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<li>D10</li>
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<li>Flute4</li>
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<li>Helix35</li>
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</ul>
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<p>刀具的刃數、螺旋角、前角無特別限制,但須與刀具廠牌型號一併詳實紀錄。</p>
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<p>刀具直徑採用10mm是為了怕材料太難切導致斷刀。10mm是以inconel718在此實驗為安全標準設立。</p>
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<h2 id="工件路徑">工件/路徑</h2>
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<p>工件尺寸: 動力計長寬 x 方便夾持高度(50mm)</p>
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<p><img src="img/fixWorkpiece.jpg" alt="fix-workpiece.jpg"></p>
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<p><img src="img/StraightLineTraining-path.png" alt="training-path"></p>
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<p>切深為0.5mm。</p>
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<p>路徑分類以關鍵字表示:low、high、through。</p>
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<p>low為低轉速、high為高轉速、through為穿越道。
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共切8刀,分別為low1、low2、low3、high1、high2、high3、through1、through2。</p>
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<p>如果材料有限,使用low2、low3即可完成訓練。</p>
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<p>low1故意切在邊緣,是為使through1可以平穩進入切削區域。</p>
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<p>high系列的每刃進給與low系列一致,但轉速不同,主要觀察轉速是否會造成力量差異。
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如果受限於材料或機台等其他原因,可以優先捨棄high2、high3。</p>
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<p>through1、through2的CWE持變,作為驗證使用。</p>
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<p>如果材料過硬,可以降低切深進行實驗。</p>
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<h2 id="實驗結果">實驗結果</h2>
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<p>動力計數據需保留。</p>
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<span> Copyright © 2025 <a href='https://superhightech.com.tw'>Tech Coordinate</a>. All rights reserved. <a href='https://superhightech.com.tw'>超級高科技股份有限公司</a> © 2025 版權所有 </span>
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<h1 id="第一離隙角避讓">第一離隙角避讓</h1>
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<p>本文所述離隙角皆為第一離隙角,即離切削區域最近的離隙角(Relief Angle)。或稱清角(Clearance Angle)。</p>
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<p>銑刀刀刃在切削過程中為擺線運動,為下圖紅色擺線。藍色圓為刀具包絡圓。</p>
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<p>紅色擺線之內(即朝刀具包絡圓圓心方向)為已切削區域;紅色擺線之外為未切削區域,如果離隙面在該處則會與未切削材料產生碰撞。
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所以<strong>標示RA(Relief Angle的縮寫)處為最小所需離隙角。</strong></p>
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<p><img src="relief-angle.png" alt="relief-angle.png"></p>
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<p>如果實際刀具離隙角小於最小離隙角,則清角面會壓到未切削工件,造成刀具及工件受力增加,使得刀具振動加大且工件表面回彈,表粗驟升,會降低刀具壽命。</p>
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<h2 id="最小所需離隙角計算">最小所需離隙角計算</h2>
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<p>於定軸加工,最小所需離隙角可由進給、轉速、刀具半徑算出;於多軸同動加工,需由程式對每個接觸點批量計算。</p>
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<p>以下簡述定軸加工的最小所需離隙角計算方式。</p>
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<p><span class="math">\(\vec r_p = \left(t\cdot v-R\cdot\sin\left(t\cdot w\right),R-R\cdot\cos\left(t\cdot w\right)\right)\)</span></p>
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<p><span class="math">\(\vec r_b = \left(a\cdot v-R\cdot\cos\left(s\right),R-R\cdot\sin\left(s\right)\right)\)</span></p>
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<p>其中
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<span class="math">\(\vec r_p\)</span> 為紅色擺線位置向量;
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<span class="math">\(\vec r_b\)</span> 為藍色圓位置向量;
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<span class="math">\(R\)</span> 為刀具半徑(mm);
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<span class="math">\(w\)</span> 為轉速(rad/s);
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<span class="math">\(v\)</span> 為進給(mm/s);
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<span class="math">\(t\)</span> 為時間;
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<span class="math">\(s = t\cdot w\)</span> ;
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<span class="math">\(a\)</span> 為指定時間,作為常數使用。</p>
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<p>令速度向量為</p>
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<div class="math">
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\[
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\vec v_p = \frac{d\vec r_p}{dt} ,
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\vec v_b = \frac{d\vec r_b}{ds}
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\]</div>
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<p><span class="math">\(\vec v_p\)</span> 、 <span class="math">\(\vec v_b\)</span> 兩向量夾角為最小所需離隙角。</p>
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