Design of an Experiment to Study the Corner Collapse in Wire EDM

以實驗方法探討線切割機轉角崩角及改善對策

梁瑞芳(Jui-Fang Liang) ； 廖運炫(Yunn-Shiuan Liao)

《中國機械工程學刊》 39卷3期 (2018/06) Pp. 329-338

摘要

The error from corner cutting is significant in wire Electrical Discharge Machine (abbr. EDM). Most studies focus on the cause of wire deflection, but there is no study on the discharge gap variation when the cutting parameters adjust in corner cutting. This paper studies the cutting parameter that affects the wire deflection and discharge gap at different cutting speeds using experimental designs. The effects of different cutting parameters on the wire deflection and discharge gap were separately investigated. The experimental results show that the processing of the corner should condiser the amount of wire deflection and effect of the discharge gap to obtain the best cutting parameters. Reducing the cutting parameter of ON to 30% of the original speed can signficantly improve the corner accuracy. This study has been applied in Accutex wire EDM and improved the corner cutting significantly.

關鍵字

wire EDM ； wire deflection ； discharge gap ； corner collapse

並列摘要

轉角誤差在線切割的加工中是非常重要的，大部分的研究著重在線撓曲因素所造成的誤差，進而探討如何改變加工參數來減低線撓曲量，但是無人探討過轉角加工參數的改變，對於放電間隙的影響程度；本文以實驗方法，設計二組不同的實驗, 在不同的加工能力下，分別探討不同放電參數對線撓曲量和對放電間隙的各別影響，據以獲得對轉角崩角量改善的最佳參數。實驗結果顯示，轉角的加工要同時考慮到線撓曲量和對放電間隙的影響才可獲得最佳的加工參數。本研究已商品化應用於Accutex線切割機床上，並獲得有效的轉角精度。