摘 要
本文中分別藉由面銑刀與球銑刀解析銑削力模式，探討SKD61硬化模具鋼材料銑削特性對於剪切與犁切機制之影響。其中於面銑加工當中，探討刀腹磨耗變化量分別對於剪切與犁切切削常數所造成之影響予以分析，根據實驗結果發現當刀具磨耗寬度增加時，對於剪切切削常數影響不大，而在切向犁切切削常數則明顯與刀具磨耗寬度呈正比的關係式。其次，在球銑削加工中，對於硬化與未硬化SKD61模具鋼銑削特性研究中發現，未硬化SKD61模具鋼於銑削加工中剪切與犁切切削常數數值大小均比硬化SKD61模具鋼還要來得大，而工件表面粗糙度也比硬化SKD61模具鋼還粗糙。

Abstract
This thesis investigates the influence of shearing and ploughing mechanism on milling characteristics of the hardened SKD61 tool steel by the analytical force models on face milling and ball end milling processes. The effect of flank wear on shearing and ploughing cutting constants is then studied through milling experiments. According to the experiments results, it is shown that increase of the flank wear only affects the shearing cutting constant slightly , but the ploughing cutting constant increases significantly with the flank wear.
The cutting constants of hardened and unhardened SKD61 tool steels are compared for ball-end milling process。The magnitude of shearing and ploughing cutting constants on unhardened SKD61 tool steel is larger than on hardened tool steel. And, the surface roughness on unhardened tool steel is rougher than hardened tool steel.

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