超聲輔助磨削已被證實有助於難削材如碳化鎢等材料的磨削加工，但至今未有一套完整的理論說明超聲輔助磨削的機制為何。本論文由切屑構形為切入點，分析超聲輔助磨削與傳統磨削的切屑構形，建立超聲輔助磨削的幾何切屑構形理論，得到超聲輔助磨削與傳統磨削的切屑在接觸弧長及最大未變形切屑厚度的差異，以及此差異對於磨削加工的影響，並且由切屑構形來說明超聲輔助磨削適用於難削材磨削之原因。最終以碳化鎢以及鋼材進行對照實驗，並以磨削力、移除量、表面粗糙度、切屑分析為判斷依據，驗證此理論的正確性。

Ultrasonic Assisted Grinding(UAG) has been verified that it can be used to grind difficult-to-cut materials such as tungsten carbide efficiently. But there is still not a complete theory to interpret the grinding mechanism of UAG. In this thesis, the chip formation of UAG has been established and compared with the conventional grinding. By the analysis of UAG chip formation and the numerical simulation, we find that the reasons for why UAG can help to grind more efficiently. Finally, we did the experiments to verify the correctness of the chip formation mechanism of UAG with grinding force, surface roughness and material removal rate.

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