电火花成形机床工作液循环系统自动控制技术.pdf

工艺·裝各
《电加工与模具》2015年增刊1
电火花成形机床工作液循环系统自动控制技术
叶书强,曹风国,张建东,王幼平
(北京市电加工研究所,北京100191
摘要:通过分析电火花成形加工对工作液循环系统的液位、液温、冲抽液压力和工作液洁净度
的控制要求,认为电火花成形加工过程中应根据加工エ况适时调整エ作液系的压力和流量。根据
工作液系的结构特点和工作特性,认为采用电机变频控制方法来调整工作液泵的流量和压力是
种节能、降噪和延长工作液泵使用寿命的良好方法。在此基础上,提出一种工作液泵频率可控的电
火花成形机床工作液循环自动控制系统,该系统由计算机控制,可根据液位、液温、液压和加エ状
态适时调整工作液泵电机的频率,从而改变工作液泵的输出流量和压力,实现进、冲、抽液的自动
切换。该系统不仅节能降噪,还实现了工作液循环系统的自动控制。
关键词:电火花成形机床;工作液循环系统自动控制;工作液泵;可调变频器
中图分类号:TG661文献标识码:A文章编号:1009-279X(2015)S1-0047-07
Automatic Control Technology of the Sinking Electro-discharge
Machines Working Fluid Circulation System
Ye Shuqiang, Cao Fengguo, Zhang Jiandong, Wang Youping
Beijing Institute of Electro-machining, Beijing 100191, China)
Abstract: Through the analysis of working fluid position, working fluid temperature, punching
pumping fluid pressure and the working fluid cleanliness control requirements in electro-discharge
machining, it showed that working fluid pressure and flow rate of the pump should be timely adjusted
according to the processing conditions of EDM process. According to the structure and characteristic
the working fluid pump, this paper argues that using the motor frequency control method to adjust the
working fluid pump flow and pressure is a suitable method for saving energy, reducing noise and
prolonging the service life of the working fluid pump. Based on this thought, a kind of working fluid
ump frequency controlled working fluid circulation automatic control system of the sinking electro
discharge machines is introduced. The system is controlled by computer, can be timely adjusted working
fluid motor frequency according to the working fluid position, the fluid temperature, fluid pressure and
machining state, thus changing the working fluid pump output flow and pressure, automatic switching
among filling fluid, rushing fluid, draining fluid. The system is not only saving energy and reducing
noise, but also realizes the automatic control of working fluid circulation system
Key words; sinking electro-discharge machines; automatic control of the working fluid circulation
system; working fluid pump; frequency converter
电火花成形加工是在工作液(介质)内实施电(通常高于工件上表面50mm以上)时,即可实施电
极与工件之间的放电蚀除加工。大多数电火花成形极与工件的放电蚀除加工。贮液箱用于贮存工作液
机床设有工作液槽和贮液箱,一般在工作液槽内放(体积是工作液槽的2~3倍),通常用工作液泵从贮
置工件并将槽内注满工作液,当液面达到预定高度液箱中抽取工作液,经过滤器过滤后送入工作液
槽。电火花成形机床开始工作时,工作液泵以大流
收稿日期:2014-12-11
量向工作液槽输送工作液,使工作液槽内的液面快
第一作者简介:叶书强,男,1959年生,高级工程师。
速上升到预定高度;在放电加工过程中,工作液泵
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