Experimental study on micro EDM-drilling of Ti6Al4V using helical electrode
Experimental study on micro EDM-drilling of Ti6Al4V using helical electrode
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DOI：
10.1016/j.precisioneng.2014.04.010
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发表时间：
2014-10-01
影响因子：
3.6
通讯作者：
Pombo, Inigo
中科院分区：
文献类型：
--
作者：
Plaza, Soraya;Sanchez, Jose A.;Pombo, Inigo
航空航天用难加工合金中高深宽比微孔的加工越来越受到人们的关注。实际使用的是基于电火花加工(EDM)的微电极和微孔的制造工艺，但大多数都涉及到微细电火花加工机床。本文研究了电火花加工Ti6Al4V时，电火花加工参数对材料去除速度、电极磨损、加工时间和微孔质量的影响。针对增加钻孔深度时碎屑去除效率不高的问题，提出了一种基于螺旋形电极的新策略。讨论了螺旋角和凹槽深度对工艺性能的影响。主要结果是，当电极螺旋角为45°，槽深为50 mm时，加工时间(孔直径800 pm)减少了37%，槽深为150p，m时，加工时间减少了19%。在Ti6Al4V上成功地加工了直径为661p，深达6.81 mm的孔，其长径比为10：1。(C)2014 Elsevier Inc.保留所有权利。
There is a growing interest in the machining of micro-holes with high aspect-ratio in difficult-to-machine alloys for the aerospace industry. Processes based on electro discharge machining (EDM) and developed for the manufacture of both micro-electrode and micro-hole are actually used, but most of them involve micro-EDM machines. In this work, the influence of EDM parameters on material removal rate, electrode wear, machining time and micro-hole quality when machining Ti6Al4V is studied. Due to an inefficient removal of debris when increasing hole depth, a new strategy based on the use of helical-shaped electrodes has been proposed. The influence of helix angle and flute depth with respect to process performance has been addressed. Main results include 37% reduction in machining times (hole diameter 800 pm) when using electrode helix angle of 45 and flute-depth of 50 Rm, and an additional 19% with flute-depth of 150 p,m. Holes of 661 p,m diameter and as much as 6.81 mm depth, which yields in aspect ratio of 10:1, have successfully been machined in Ti6Al4V. (C) 2014 Elsevier Inc. All rights reserved.