摘要
针对现有绝缘陶瓷电火花加工效率较低、加工质量较差的问题,通过分析绝缘陶瓷的间隙放电状态,研制基于现场可编程逻辑门阵列(FPGA)绝缘陶瓷的电火花加工脉冲电源。该电源可实现低阻火花放电的等电路脉宽模式和抑制有害脉冲放电的高频分组脉冲模式。在硬件上,脉冲电源采用模块化设计,由基于FPGA的主振模块、带LCD缓冲回路的MOSFET功率放大模块、基于四阈值电压电流比较法的间隙放电状态检测模块组成。结果表明:与常规脉冲电源相比,针对绝缘陶瓷氧化铝的加工,所研制的脉冲电源可有效提高低阻火花放电率,抑制有害脉冲放电状态;其加工速度为0.48 mm/min,提高了33%;电极相对损耗为132%,降低了16.9%;表面粗糙度为4.6μm,降低了22%;孔边和孔壁无显著微孔隙产生。该脉冲电源可有效提高绝缘陶瓷的加工效率和加工质量。
Aiming at the problem of low efficiency and poor processing quality for electrical discharge machining(EDM)of insulated ceramics,an EDM pulse power supply based on field programmable gate array(FPGA)was developed by analyzing the gap discharge state of insulating ceramics.The power supply can realize the equal pulse duration of low-resistance spark discharge and high-frequency packet pulse mode for suppressing harmful discharge.In terms of the hardware,the pulse power supply was designed in modular,which was composed of FPGA-based main vibration module,MOSFET power amplification module with LCD buffer circuit,and the gap discharge state detection module based on 4 threshold voltage and current.The results show that compared with the conventional pulse power supply,by using the developed pulse power supply,the low-resistance spark discharge rate can be effectively improved and the harmful pulse discharge rate can be effectively suppressed;the processing speed is 0.48 mm/min,which is increased by 33%;the relative loss of the electrode is 132%,which is reduced by 16.9%;the surface roughness is 4.6μm,which is reduced by 22%;the pore edge and the pore wall have no significant micropore.The developed pulse power can effectively improve the processing efficiency and processing quality of insulated ceramics.
作者
王力
连海山
WANG Li;LIAN Haishan(School of Mechatronics Engineering,Lingnan Normal University, Zhanjiang Guangdong 524000,China)
出处
《机床与液压》
北大核心
2021年第19期88-93,共6页
Machine Tool & Hydraulics
基金
国家自然科学基金青年科学基金项目(51705228)
广东省自然科学基金面上项目(2020A1515010165)
湛江市科技计划项目(2018A02009)。
关键词
绝缘陶瓷
脉冲电源
电火花加工
现场可编程逻辑门阵列
Insulated ceramics
Pulse power supply
Electrical discharge machining(EDM)
Field programmable gate array(FPGA)
