摘要
在微细电火花加工中,使用RC放电回路容易得到数十至数百纳秒的窄脉宽电流,但RC放电回路由于向电容器充电所需时间而不能得到很高的放电频度,严重影响其加工效率。为此,本研究开发了微细电火花加工用晶体管式脉冲电源,并对其加工特性进行了评价,找出了适合于微细电火花加工的晶体管式脉冲电源。实验结果表明,自振式晶体管脉冲电源因其加工速度慢并不适于微细放电加工。通过开发等脉宽晶体管脉冲电源,可实现脉宽80 ns的放电电流,与传统的RC放电回路相比,加工速度可提高2至3倍。
RC pulse generator can easily generate the pulse duration as short as several dozen nanoseconds in micro-EDM, but its discharge frequency is low due to the time needed to charge the capacitor in micro-EDM, which has a strong negative effect on its working efficiency. Therefore, a new transistor type isopulse generator has been developed for micro-EDM in this research. Through evalu- ating the machining characteristics, the transistor type isopulse generator has been proved to be suitable for micro-EDM. The experimental results reveal that the transistor type pulse train generator is unsuitable for micro-EDM due to its low removal rate. Pulse duration of 80ns can be obtained by using the transistor type isopulse generator developed, and the removal rate using this pulse generator is two to three times higher than that using the traditional RC pulse generator.
出处
《电加工与模具》
2005年第6期9-11,33,共4页
Electromachining & Mould
基金
国家973计划资助项目(2003CB716204)
北京市自然科学基金资助项目(3062011)
