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<article data-uid="Cmd-GeomDiff">
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<h1 id="幾何比對">幾何比對</h1>
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<p>幾何比對指令 <a class="xref" href="../../../../../api/Hi.MachiningProcs.RuntimeApi.html#Hi_MachiningProcs_RuntimeApi_Diff_">Diff</a><small>(API)</small> 用於比對工件目標形狀(Target Shape)與仿真後形狀。</p>
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<h5>Note</h5>
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<p><strong>指令格式</strong></p>
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<pre><code class="lang-csharp">Diff(<掃描半徑(mm)>);
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</code></pre>
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<p><掃描半徑>(Detection Radius)是工件目標形狀的表面延伸距離，如果仿真後表面超過該距離，則不計算偏差值。
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掃描半徑越大，計算時間越長。</p>
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<h5>Tip</h5>
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<p><strong>指令範例</strong></p>
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<pre><code class="lang-csharp">Diff(1);
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</code></pre>
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</div>
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<p>比對後以顏色呈現過切與留料距離。</p>
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<p>比對後工件表面的路徑索引將會失效。</p>
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<h2 id="往復斜面干涉比對案例解析">往復斜面干涉比對案例解析</h2>
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<p>CAM產生的NC碼未必如預期，與使用方式有關，許多參數可以調整，還要靠使用者的經驗與細心，所以需要誤差比對確定CAM產生的NC無誤。</p>
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<p>本範例為CAM產生的NC，經過誤差比對發現諸多需修正處。</p>
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<p>這些問題若不使用軟體輔助只能在加工結束後發現，對精密製造影響甚鉅。</p>
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<h3 id="比對標的">比對標的</h3>
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<p>以上下斜坡之幾何做干涉比對測試，切削模擬之刀具為R0.5mm、D12mm之牛鼻刀，切削路徑為往復移動。</p>
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<p>比對標的、切削路徑如下：</p>
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<p><img src="img/geom_compare_slide_design.png" alt="geom_compare_slide_design">
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比對標的</p>
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<p><img src="img/slide_resolution_0p1_with_path.png" alt="slide_resolution_0p1_with_path">
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切削路徑</p>
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<h3 id="結果與討論">結果與討論</h3>
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<p>切削模擬後的干涉比對如下圖。</p>
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<p><img src="img/diff_resolution_0p02.png" alt="diff_resolution_0p02">
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切削模擬後的干涉比對。綠色為精準，正紅色為過切超過0.02mm、正藍色為留料超過0.02mm。</p>
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<ul>
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<li>目標幾何靠近壁面處為直角，故偵測出留料。</li>
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<li>進刀段落往復區域的NC碼Z值不一致，故偵測到過切。</li>
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<li>往復邊緣處刀子沒有走出刀具半徑，離工件距離過短，故偵測到留料。</li>
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<li>往復路徑中的藍綠斑馬紋為往復間距過大造成的留料。</li>
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</ul>
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