... 包络宽带示波器 envelope wide-scope; 包络面 envelope; enveloping surface; 包络曲线 envelope curve; ...
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A toroid is generated by whirling cutting tools when machining, and the helicoidal surface in the workpiece is the enveloping surface that is formed by the toroid in space motion .
铣削时，旋风刀具在工作过程中，刀尖圆弧形成一圆环面，而被加工出的螺旋面可以作为圆环面空间运动的包络面。
参考来源 - 内旋包络式数控螺杆铣床的研制·2,447,543篇论文数据，部分数据来源于NoteExpress
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