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題 名 | 放電加工參數對加工表面缺陷及粗糙度之影響分析=Influence of EDM Process Parameters on Surface Defects and Roughness |
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作 者 | 李驊登; 楊永名; 葉麗雅; 邴兆齊; 陳中城; | 書刊名 | 材料科學 |
卷 期 | 28:4 1996.12[民85.12] |
頁 次 | 頁270-278 |
分類號 | 468.5 |
關鍵詞 | 放電加工製程參數; 脈衝能量; 表面缺陷; 粗糙度; 迴歸分析; Porcess parameters of EDM; Pulse energy; Surface defects; Surface roughness; Regression method; |
語 文 | 中文(Chinese) |
中文摘要 | 放電加工的製程參數影響加工表面特性變化,本研究分別選擇放電電 壓、放電電流及放電持續時間為放電加工主要參數,觀察這些參數對放電後的 S45C及SKD11材其表面缺陷及特性之影響。並根據不同的放電條件,分析加工後 之粗糙度之變化,並觀察其表面破壞金相,同時利用迴歸分析法來推測趨勢,藉 此評估影響放電加工缺陷之加工條件及相互間的關係,提供做為選擇適當的加工 參數之依據,以期能改善放電加工所造成的表面缺陷。 實驗結果顯示,脈衝能量越大其加工表面的缺陷亦隨之增多,至於加工表面粗糙 度則大致隨著放電電流或放電持續時間增大而變大,所形成的表面裂紋也相對增 多;而放電電壓影響有限。由本研究之實驗結果,提出粗糙度之關係式,以放電 電流[p及放電持續間ON取代一般常用之脈衝能量,得到計算經驗公式為 Ra=0.30.(Ip.ON)0.5適用於S45C與SKD11材。 |
英文摘要 | Process parameters of Electro-Discharge Machining (EDM) play an important role in influencing the characteristics of machined surface. Pulse voltage, pulse current and pulse duration time were the three major concerned factors chosen here to investigate and evaluate theirinfluence on surface defects and characters of specimens after EDM. Mild carbon steel JISS45C and tool steel JIS SKD11 were used in this study as working matsrials. The surfaceroughness and morphological defects on specimen surface were investigated and observed according to different EDM working conditions. Attempt were made to quantify the correlationbetween surface roughness with respect to the process parameters. Regression method are used to predict the trend and their mutual correspondence with an aim to offer a criteria or base for an optimum EDM process, or at least to minimize the surface defects after suitable choice of working conditions. Experimental results show that more surface defects, as a whole, are formed when the pulseenergy is increased. However, the surface roughness and the amount of cracks formed on specimen surface are evidently increased with increasing pulse current and/or pulse duration time aswell. Whereas the influence by pulse voltage is limited. An empirical equation for roughness estimation based on pulse current and pulse duration time instead of commonly used pulse energy is proposed and proved to be valid for both S45C and SKD11 with Ra = 0.30 . (lp . ON)0.5 |
本系統中英文摘要資訊取自各篇刊載內容。