|本期目录/Table of Contents|

[1]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(自然科学版),2020,42(01):101-109.[doi:10.3969/j.issn.1671-7627.2020.01.015]
 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 TECH UNIVERSITY(NATURAL SCIENCE EDITION),2020,42(01):101-109.[doi:10.3969/j.issn.1671-7627.2020.01.015]
点击复制

基于电化学溶解的电火花高速穿孔后处理工艺研究()
分享到:

《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
42
期数:
2020年01期
页码:
101-109
栏目:
出版日期:
2020-01-13

文章信息/Info

Title:
Study on post-processing for high-speed electrical discharge machining based on the electrochemical dissolution
文章编号:
1671-7627(2020)01-0101-09
作者:
汪琛1张彦1郭兆翠2MDRASHEDULIslam1纪磊1
1.南京工业大学 机械与动力工程学院,江苏 南京 211800; 2.南京晨光集团有限责任公司,江苏 南京 210006
Author(s):
WANG Chen1 ZHANG Yan1GUO Zhaocui2 MD RASHEDUL Islam1 JI Lei1
1.College of Mechanical and Power Engineering,Nanjing Tech University, Nanjing 211800, China; 2. China Aerospace Science & Industry Nanjing Chenguang Group, Nanjing 210006, China
关键词:
电火花加工 电解加工 螺纹管电极 后处理 间隙冲液
Keywords:
electrical discharge machining electrochemical reaming helical tube electrode post-processing lateral flushing
分类号:
TG661
DOI:
10.3969/j.issn.1671-7627.2020.01.015
文献标志码:
A
摘要:
为解决电火花加工因放电高温和出口间隙缺液而导致的小孔孔壁表面质量差、孔形精度低的问题,提出基于电化学溶解的电火花高速穿孔后处理工艺方法。通过流场仿真对比了螺纹管电极与圆柱管电极二者加工间隙内流速以及流速的矢量分布,并通过对照实验对仿真结果进行了验证,最后针对电解后处理的加工参数进行了优化。结果表明:相较于圆柱管电极,螺纹管电极能将侧面加工间隙内的轴向流速数值从27.17 m/s提高至52.29 m/s,这更有利于微小加工间隙内加工产物有效排出; 小孔经过电化学二次处理后,其锥度降低了近38%,圆度误差约降低了32%,并且高温火花放电导致的孔壁表面缺陷大幅减少; 最终获得的小孔精度最高时的电解后处理加工参数组合为电压幅值30 V、电解液质量浓度6 g/L、电解扩孔时间25 s。
Abstract:
To solve the problem of hole surface quality and hole shape accuracy caused by high discharge temperature and electrolyte diminish in machining gap, the method of electrochemical machining based on helical tube electrode as post-processing for high-speed electrical discharge machining was proposed. The flow field simulation during stage of post-processing was carried out to compare the axial velocity and velocity vector distribution in the machining gap between the helical and cylindrical tube electrode. The simulation results were verified by the experiments. The processing parameters of electrochemical post-processing were optimized. The results showed that compared with the cylindrical tube electrode, the helical tube electrode could increase the velocity value in side machining gap from 27.12 m/s to 52.29 m/s, which contributed to the products removal from the tiny machining gap. The taper and roundness errors of the holes machined by ECM post-processing were reduced by nearly 38% and 32%, respectively. And they also obtained few surface defects caused by high temperature discharge. The combination of ECM post-processing parameters with the highest hole precision was the voltage amplitude of 30 V, mass concentration of electrolyte of 6 g/L, and electrochemical reaming duration of 25 s.

参考文献/References:

[1] 李朝将,赵雷,李勇,等.气膜冷却孔电火花加工参数优化及重熔层厚度测量实验[J].电加工与模具,2016(2):15.
[2] 张晶晶,曹明让.削边电极电火花小孔加工仿真及试验研究[J].机械设计与制造,2013(10):139.
[3] 杨晓鹏,王燕青,曹明让,等.工作液电导率对高Nb-TiAl合金电火花加工小孔精度的影响[J].科学技术与工程,2017,17(35):213.
[4] 徐正扬,张辰翔.基于电火花-电解复合加工方法的微小孔制造[J].航空制造技术,2018,61(3):16.
[5] 孙永兴,曲馨,王引真,等.电火花电解复合加工工作液的制备及其对割缝效果的影响[J].电加工与模具,2018(4):30.
[6] 杭雨森.航空发动机单晶材料微小孔电火花-电解复合加工技术研究[D].南京:南京航空航天大学,2018.
[7] 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 & Manufacture,2012,54:55.
[8] WU X Y,LI S J,JIA Z,et al.Using WECM to remove the recast layer and reduce the surface roughness of WEDM surface[J].Journal of Materials Processing Technology,2019,268:140.
[9] HUNG J,LIU H,CHANG Y,et al.Development of helical electrode insulation layer for electrochemical microdrilling[J].Procedia Cirp,2013,6(7):373.
[10] PLAZA S,SANCHEZ J A,PEREZ E,et al.Experimental study on micro EDM-drilling of Ti6Al4V using helical electrode[J].Precis Eng,2014,38(4):821.
[11] HUNG J C,LIN J K,YAN B H,et al.Using a helical micro-tool in micro-EDM combined with ultrasonic vibration for micro-hole machining[J].Journal of Mircromechanics and Microengineering,2006,16(12):2705.

备注/Memo

备注/Memo:
收稿日期:2019-09-21
基金项目:国家自然科学基金青年基金(51705239)
作者简介:汪琛(1993—),男,E-mail:wangchennjtech@163.com; 张彦(联系人),讲师,E-mail:zhangyanzy@njtech.edu.cn.
引用格式: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(自然科学版),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 Tech University(Natural Science Edition),2020,42(1):101-109..
更新日期/Last Update: 2020-01-30