Abstract
由於磨削過程中不同磨削條件，將生成相異型態的切屑，切屑生成的同時也反應了磨削力的大小與磨削能的多寡，以及工件加工品質，觀察切屑型態的變化有助於磨削機構與磨削特性的瞭解。本文探討切屑型態與磨削條件的關係，並分析切屑型態變化時，聲射訊號、表面粗度、比磨削能、磨削力等磨削特性的相對應變化。利用影像處理計算熔融切屑的體積，從而定義一個關於切屑體積的參數：等效切屑體積，並探討其與磨削特性的關係，透過此參數可以描述磨削特性的變化。特過高倍率電子顯微鏡的觀察，圓球型切屑呈現多種的組織型態，其中一種相當微小大腦狀表面的切屑，經由分析是種多點孕核的樹枝狀結晶組織，並非是由許多個未氧化、未熔化的微小切屑以電子鍵結構成，對於其他型態生成原因也加以說明。研究發現經由切屑的型態將可以推測出加工的表面品質、比磨削能、磨削力與平均切屑溫度等磨削特性的改變，收集切屑並觀察其型態，即可明瞭當時的磨削特性的變化，並對切屑生成型態的機制有更進一步的瞭解。Grinding chips obtained under different condition represent awide variety of morphologies. Observation of chips using ascanning election microscope leads to more understood ofmaterial removal and chip formation mechanism. In this study,an image process method was used to measure sizes of grindingchips and an equivalent chip volume parameter was defined toinfer the comparable size of chips due to various conditions.The relationships between this parameter and experimental datasuch as acoustic emission signal, grinding energy, grindingforce and surface roughness are presented. A special shape ofspherical chips was found to be a consequence of dendritecrystalline structure. The shape was former considered asconsisting of many extremely thin platelets that do not oxidizeand melt. Results indicate grinding chips reveal someinformation of grinding process and characteristic.