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題名 | 放電加工之模糊控制=Fuzzy Control of Electrical Discharge Machining |
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作者姓名(中文) | 張義芳; 石興銓; 粘永峰; | 書刊名 | 大葉學報 |
卷期 | 13:1 2004.06[民93.06] |
頁次 | 頁57-66 |
分類號 | 448.942 |
關鍵詞 | 電腦數值控制; 放電加工; 模糊控制; 跳躍排渣控制; CNC; EDM; Fuzzy control; Jump control; |
語文 | 中文(Chinese) |
中文摘要 | 本研究將根據放電狀況如導弧延遲時間百分比(Td%)與參考值之誤差量即導弧延遲時間誤差量(ETd)、此誤差量的變化量(DETd)、電弧(arcing)發生次數,經由模糊控制(fuzzy control)推論出適當的伺服進給率、放電波修止時間(Toff)、強迫跳躍排渣的觸發訊號,以維持其放電加工之速度。 先以導弧延遲時間百分比誤差量(ETd)、導弧延遲時間誤差量的變化量來進行模糊控制電極位置,使導弧延遲時間百分比維持在合適的狀態。當渣屑不易排除,致使導弧延遲時間百分比持續趨於過低的狀態時,可再經由電弧發生的次數百分比判斷後,就能以模糊理論來進行放電休止時間的提升。若放電休止時間調整值超過原始設定值三段大後,則需進行強迫排渣以平衡間隙中的渣屑濃度,如此才能確實將碳渣排出並確保不會積碳。 此放電參數模糊控制法與軟體架構,將應用於裝置在工研院機械所發展之放電加工電腦數值控制器(ITRI EDM CNC)的放電加工機台,以驗證其增進之放電效果。 |
英文摘要 | In this study focusing on a computerized numerical controller (CNC) for an electric discharge machine (EDM), a fuzzy controller for discharge-gap control and discharge-parameters control are proposed in order to improve the erosion performance during the eroding process. After determining the discharge conditions such as the percentage of deflection of ignition delay (Etd), the variation in the deflection of the ignition delay (DEtd) and the arcing times, the appropriate feed rate, the pulse-off time (Toff) and the jump frequency can be generated via a fuzzy-control rule. The percentage of the practical ignition delay can be maintained at the desired value by regulating the electrode position according to the deflection of the ignition delay and its variation. During the long term of the discharging process, the carbon powder may scarcely be ferreted out from the discharge gap; hence the ignition delay cannot be maintained at the reference value. A strategy for increasing the pulse-off time can be developed via fuzzy control with inputs from the measured deflection of the ignition delay and the arcing times of the sparks. While the increased pulse-off time is larger than three times the original setting value, the electrode-jumping process should proceed to decrease the carbon density in the gap and avoid the carbon welds on the eroding surface. This fuzzy-control algorithm and its software structure will be installed in the hardware of the computerized numerical controller (CNC) of an electric discharge machine (EDM) developed by the Mechanical Industry Research Laboratory of the Industrial Technology Research Institute (ITRI), Taichung, Taiwan in order to verify the improvement in the electrode-discharging process |
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