本研究使用線電極放電，用以切削多晶鑽石材料，並製作鑽石刀
具。再以線電極加工，對此刀具進行銳利化，同時對材料移除率、表
面粗糙度、刀尖半徑以及波動層進行最佳化之研究。此製程為鑽石線
鋸用以成形刀片及鑽石研磨應用於銳利化刀具的替代方案，同時以不
降低其刀具表面完整性之規範，進行大量生產。本研究中，使用全因
子實驗（2 × 3 × 3）的方式來評估操作參數（開路電壓、脈衝放電時
間、脈衝休止時間）對觀測指標的影響。實驗結果會透過變異數分析
（Analysis of variance）來檢驗參數對觀測指標之顯著性以及貢獻度，
以得到單一指標最佳化之參數組合。此外，本研究以迴歸方程式
（Regression equations）來建立各參數與指標之間之關係模型。在使
用者決策方程式下，給予各指標權重，進行無因次化之函數疊加，建
立目標方程式，以架構反應曲面（Response surface methodology），達
到多指標最佳化之結果。實驗結果顯示，在操作參數為開路電壓120
V、脈衝放電時間0.35 μs 及脈衝休止時間30 μs 時，其材料移除率最
高（12.71 mg / min）。而在開路電壓為100 V、脈衝放電時間為0.25
μs 以及脈衝休止時間為50 μs 時，其表面粗糙度最精細（Ra 1.38 μm）。
在反應曲面之最佳化中，結果顯示當權重分配為Ra: 50%及MRR:
50%之情形下進行目標方程式之演算，可以得到最佳化之結果為
MRR 10.503 mg / min、Ra 1.70 μm。同時在另一個權重分配（Ra: 80%、
MRR: 20%）下，最佳化之結果則為MRR 5.385 mg / min、Ra 1.462 μm。

Machining of polycrystalline diamond tools is challenging due to its
high hardness, and high elastic modulus. When shaping of polycrystalline
diamond, it is limited to diamond-wire sawing whereas the associated
sharpening process is constrained by diamond-wheel grinding. This paper
presents an alternative solution for shaping and sharpening of diamond
tools by using wire electrical discharge machining (WEDM) without
degradation on their tool geometry and surface integrity. In this work, the
full factorial experiments (2×3×3) were carried out for the evaluations of
the open voltage, pulse on-time, pulse off-time on the material removal
rate, surface roughness, asperity and edge radius in the roughing tests.
Statistical methods based on ANOVA are used for the analysis and
examinations. In processing, when open voltage 100 V, current 30 A, pulse
on-time 0.25 μs, pulse off-time 50 μs are employed, the low surface
roughness of Ra 1.38 μm is produced, with the corresponding material
removal rate of 4.84 mg / min. The developed multiple criteria model in
RSM, suggests the optimized parameter set and results when weightings of
material removal rate and surface roughness are given.

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