Experimental Study on EDM ECM Hybrid Processes of High-quality Small Hole with Super Depth-diameter Ratio

doi:10.3901/JME.2024.09.374

Abstract

Abstract: Traditional machining methods face great challenges when machining small holes with super depth-diameter ratio on difficult to machine materials. At present, electrical discharge machining (EDM) is still one of the most effective methods for machining deep holes on difficult to machine materials, but there are some problems such as poor surface quality. Electrochemical machining (ECM) has the advantage of high surface quality, but it is not as efficient and accurate as EDM in deep hole machining. Therefore, combining EDM and ECM is the most effective way to achieve high efficiency, high quality and high precision machining of deep holes. This study applies low concentration hydrochloric acid electrolytic-dielectrics to EDM ECM hybrid processes. The experimental results confirmed that this electrolytic-dielectrics was superior to traditional neutral electrolytic-dielectrics in terms of machining efficiency and accuracy. To improve the machining accuracy and surface quality of small holes with super depth-diameter ratio simultaneously, this study proposes a method of partial insulation tool electrode. A high-quality and high-precision machining of small holes with super depth-diameter ratio (> 50:1) through process parameter optimization is obtained. This method has broad application prospects in the processing of small holes with super depth-diameter ratio in difficult to machine materials.

Key words: EDM ECM hybrid processes, acid electrolytic-dielectrics, small hole with super depth-diameter ratio, machining surface quality

CLC Number:

TG661

YUE Xiaoming, ZANG Shuo, ZHAO Yonghua, LIU Weidong, YIN Yingyue, ZHANG Qinhe. Experimental Study on EDM ECM Hybrid Processes of High-quality Small Hole with Super Depth-diameter Ratio[J]. Journal of Mechanical Engineering, 2024, 60(9): 374-382.

References

[1] 刘斌，吴强，成哲. 微小孔电火花电解复合加工关键技术研究[J]. 电加工与模具，2019，348(4)：29-32. LIU Bin，WU Qiang，CHENG Zhe. Research on key technology of micro-hole EDM-ECM composite processing[J]. Electric Machining and Mould，2019，348(4)：29-32.
[2] 褚旭阳，全学军. 微细电火花加工及表面重铸层电解去除装置的设计[J]. 机床与液压，2020，48(4)：71-74，85. CHU Xuyang，QUAN Xuejun. Design of micro EDM and surface recast layer electrolytic removal device [J]. Machine Tools and Hydraulics，2020，48(4)：71-74，85.
[3] NGUYEN M D，RAHMAN M，WONG Y S. Simultaneous micro-EDM and micro-ECM in low-resistivity deionized water[J]. International Journal of Machine Tools and Manufacture，2012，54-55：55-65.
[4] NGUYEN M D，RAHMAN M，WONG Y S. Modeling of radial gap formed by material dissolution in simultaneous micro-EDM and micro-ECM drilling using deionized water[J]. International Journal of Machine Tools & Manufacture，2013，66：95-101.
[5] 汪琛，张彦，郭兆翠，等. 基于电化学溶解的电火花高速穿孔后处理工艺研究[J]. 南京工业大学学报，2020，42(1)：101-109. WANG Chen，ZHANG Yan，GUO Zhaocui，et al．Study on post-processing for high-speed electrical discharge machining based on the electrochemical dissolution[J]. Journal of Nanjing Technology University ，2020，42(1)：101-109．
[6] 张世浩. 旋转内冲液微小孔电火花/电解组合加工技术研究[D]. 哈尔滨：哈尔滨工业大学，2016. ZHANG Shihao. Research on fabrication of micro-hole by edm-ecm combined processing with rotary tube[D]. Harbin：Harbin Institute of Technology，2016.
[7] 刘云飞. 无再铸层小孔的电加工组合工艺试验研究[D]. 南京：南京航空航天大学，2007. LIU Yunfei. Preparation of small-hole without recast layer by electrical combined machining[D]. Nanjing：Nanjing University of Aeronautics and Astronautics，2007.
[8] ZHANG Y，XU Z Y，ZHU D，et al. Tube electrode high-speed electrochemical discharge drilling using low-conductivity salt solution[J]. International Journal of Machine Tools and Manufacture，2015，92：10-18.
[9] 张彦，朱荻，徐正扬. 微小孔电火花-电解复合加工基础研究[J]. 机械工程学报，2018，54(1)：26. ZHANG Yan，ZHU Di，XU Zhengyang. Fundamental research on electrochemical and discharge machining for micro hole[J]. Journal of Mechanical Engineering，2018，54(1)：26.
[10] AHMED S，SPEIDEL A，MURRAY J W，et al. Electrolytic-dielectrics：A route to zero recast electrical discharge machining [J]. International Journal of Machine Tools& Manufacture，2022，181：103941.
[11] 朱云. 微小孔电火花—电解复合加工穿透检测及实验研究[D]. 南京：南京航空航天大学，2016. ZHU Yun. Penetration detection and experiments of EDM & ECM hybrid machining for micro-hole[D]. Nanjing：Nanjing University of Aeronautics and Astronautics，2016.
[12] 曲馨. 电火花电解复合加工工作液的制备与性能研究[D]. 青岛：中国石油大学(华东)，2018. QU Xin. Study on the preparation and properties of electrical discharge machining (EDM) and electrochemical machining (ECM) working fluid[D]. Qingdao：China University of Petroleum (East China)，2018.
[13] 丁飞，徐正扬，王丰，等. 冰层辅助对电火花-电解复合穿孔的影响[J]. 航空学报，2017，38(5)：260-268. DING Fei，XU Zhengyang，WANG Feng，et al. Effects of aided ice laver on electrochemical discharoe drilling[J]，Acta Aeronautica et Astronautica Sinica. 2017，38(5)：420643.
[14] 唐健，张彦，ISLAM M D R，等. 电火花-电解复合加工的低电极损耗机理研究[J]. 机械制造与自动化，2019，48(6)：18-21. TANG Jian，ZHANG Yan，ISLAM M D R，et al. Research on low electrode wear EDM and ECM hybrid process based on sputter compensation [J]. Machine Building & Automation，2019，48(6)：18-21.

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[15]	ZHU Pailong;QI Changzheng;WEN Zhiyuan;TANG Dianbo;ZHOU Jinjin;XU Zhongyao. PROCESS APPROACH WITH ITS ELECTRODE DESIGN AND MANUFACTURING FOR DEEP MICRO-HOLE OF EXTRA LARGE ASPECT RATIO [J]. , 2006, 42(2): 198-202.