Pulse Electrochemical Narrow Slot Machining Based on Segmented Feeding Control Method

doi:10.3901/JME.2018.23.209

Abstract

Abstract: To deal with low machining efficiency and short-circuits caused by the instability of the inter-electrode gap size in pulse electrochemical narrow slot machining, a segmented cathode feeding control method to be self-adaptive with the dissolution rate of work piece is proposed in this paper. A theoretical model between inter-electrode current and feeding depth is constructed and adjusted by experimental data to be accordant to real machining process. According to the relationship between current and feeding depth, a correction equation for feeding velocity is formulated, and cathode feeding process is divided into multiple stages with different feedrates. To make velocity smooth link between two neighbor stages and avoid inter-electrode current surge, a velocity blending algorithm is proposed and velocity control equation is constructed. Experimental results show that the segmented feeding control algorithm can avoid short-circuits, improve machining efficiency and achieve contour accuracy of industrial application in small gap pulse electrochemical machining.

Key words: inter-electrode gap, pulse electrochemical machining, segmented feeding control, velocity blending

CLC Number:

TG662

REN Kun, ZHANG Yumeng, JIANG Danyan, PAN Jun, CHEN Wenhua, HU Xuxiao. Pulse Electrochemical Narrow Slot Machining Based on Segmented Feeding Control Method[J]. Journal of Mechanical Engineering, 2018, 54(23): 209-214.

References

[1] 王之明. 关于电解加工间隙的阐述[J]. 电加工与模具, 1973(5):13-30. WANG Zhiming. Elaboration on gap of electrochemical machining[J]. Electromachining & Mould,1973(5):13-30.
[2] 王希,赵东标,云乃彰. 一种电解加工间隙的智能测控方法研究[J]. 中国机械工程,2007,18(23):2860-2864. WANG Xi,ZHAO Dongbiao,YUN Naizhang. Research on intelligent measurement and control method of interelectrode gap of electrochemical machining(ECM)[J]. Journal of Mechanical Engineering, 2007, 18(23):2860-2864.
[3] 王希,赵东标,云乃彰. 基于小波变换、模糊控制的电解加工间隙检测与控制[J]. 中国机械工程,2006,17(11):1170-1173. WANG Xi,ZHAO Dongbiao,YUN Naizhang. Measurement and control of interelectrode gap during electrochemical machining(ECM) based on wavelet transform and fuzzy control[J]. China Mechanical Engineering,2006,17(11):1170-1173.
[4] 陆永华, 赵东标, 云乃彰, 等. 基于六维力电解加工间隙在线检测试验研究[J]. 机械工程学报, 2006, 42(7):126-131. LU Yonghua,ZHAO Dongbiao,YUN Naizhang,et al. Experimental research of on-line monitoring gap of electrochemical machining based on 6D forces[J]. Journal of Mechanical Engineering, 2006, 42(7):126-131.
[5] 王贤成,狄士春,迟关心,等. 间隙平均电流检测在高频窄脉冲电解加工中的应用[J]. 航空精密制造技术, 2006,42(2):36-38. WANG Xiancheng,DI Shichun,CHI Guanxin,et al. Gap average current measuring applied in HSPECM[J]. Aviation Precision Manufacturing Technology,2006, 42(2):36-38.
[6] RAJURKAR K P,WEI B,KOZAK J,et al. Modelling and monitoring interelectrode gap in pulse electrochemical machining[J]. CIRP Annals-Manufacturing Technology,1995,44(1):177-180.
[7] RAJURKAR K P,SCHNACKER C L,LINDSAY R P. Some aspects of ECM performance and control[J]. CIRP Annals-Manufacturing Technology,1988,37(1):183-186.
[8] LI Yong,ZHENG Yunfei,YANG Guang,et al. Localized electrochemical micromachining with gap control[J]. Sensors and Actuators A:Physcal,2003,108(1-3):144-148.
[9] WEI B,RAJURKAR K P,TALPALLIKAR S. Identification of interelectrode gap sizes in pulse electrochemical machining[J]. Journal of the Electrochemical Society,1997,144(11):3913-3919.
[10] BRUSILOVSKI Z. Adjustment and readjustment of electrochemical machines and control of the process parameters in machining shaped surfaces[J]. Journal of Materials Processing Technology,2008,196(1-3):311-320.
[11] de SILVA A K M,ALTENA H S J,MCGEOUGH J A. Precision ECM by process characteristic modelling[J]. CIRP Annals-Manufacturing Technology,2000,49(1):151-156.
[12] KOYANO T,KUNIEDA M. Micro electrochemical machining using electrostatic induction feeding method[J]. CIRP Annals-Manufacturing Technology, 2013,62(1):175-178.
[13] NEAL R E. ECM in-process data collection and control[J]. Precision Engineering, 1980,2(3):133-138.
[14] 赵建社,王峰,肖雄,等. 微尺度弧形群缝电解加工试验研究[J]. 机械工程学报,2014,50(23):186-193. ZHAO Jianshe,WANG Feng,XIAO Xiong,et al. Experiment research on electrochemical machining of meso mcale arc-shaped multi-grooves[J]. Journal of Mechanical Engineering,2014,50(23):186-193.