共查询到20条相似文献,搜索用时 140 毫秒
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朱立泰 《工业仪表与自动化装置》1974,(2)
无产阶级文化大革命以来,我厂模具制造和特殊另件加工中广泛采用了电火花加工技术,为了扩大电加工使用范围进一步提高其工艺指标,我们在学习兄弟单位经验的基础上又试制了YB-3型晶体管复式回路脉冲电源电火花穿孔机床。这种晶体管复式回路电源较原有的电子管电源、闸流管电源、单回路晶体管电源具有效率高、寿命长、无高压、容易实现组件化、维修方便和脉冲参数调节范围广等优点如: 1.参数大范围可调: 相似文献
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为了提高电火花加工的表面质量与精度,研究应用CPLD器件作为电火花加工脉冲电源的脉冲信号发生器,根据器件的特点,同时采用原理图输入和VHDL语言输入法,设计出适用于电火花加工的脉冲电源控制电路,并用示波器测试其脉冲电源的脉冲放电波形,获得满足电火花加工要求的脉冲电源。 相似文献
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日前,宁江集团研制出的具有先进水平的实用电火花小孔脉冲电源通过鉴定。针对电火花加工机床市场的发展和要求,公司产品实验室进行了SY0403-20A电火花小孔脉冲电源的研制。经过反复实验,成功地解决了该类产品最棘手的电源稳定性和可靠性问题,并扩大了电火花加工孔的规格,使其加工孔径可达8~10m m,加工效率也比原电火花机床提高50%,而加工后的小孔精度、表面粗糙也得到了一定的提高。经小批量生产及用户评定后,集团公司决定投入批量生产。(陈运发)宁江集团研发成功电火花小孔脉冲电源@陈运发 相似文献
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电火花加工是利用浸在工作液中的两极间脉冲放电时产生的电蚀作用蚀除导电材料的特种加工方法,又称放电加工或电蚀加工,英文简称EDM。一、电火花加工的发展回顾及基本工艺1943年,苏联学者拉扎连科夫妇研究发明电火花加工,之后随着脉冲电源和控制系统的改进,而迅速发展起来。最初使用的脉冲电源是简单的电阻-电容回路。50年代初,改进为电阻-电感-电容等回路。同时,还采用脉冲发电机之类的所谓长脉冲电源,使蚀除效率提高,工具电极相对损耗降低。随后又出现了大功率电子管、闸流管等高频脉冲电源,使在同样表面粗糙度条件下的生产率得以提高。… 相似文献
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脉冲电源是电火花加工机床的重要组成部分。随着电子技术的发展和对电火花加工的精度、效率等要求的不断提高,目前,晶体管脉冲电源已在逐步取代闸流管及电子管脉冲电源。这主要是由于这种电源具有体积小、重量轻、结构紧凑、容易调整、便于维修、寿命长、性能稳定和电参数调节范围宽等优点。 晶体管脉冲电源主要有两种:一种是简式晶体管脉冲电源,一种是复式晶体管脉冲电源。前者加在电极和工件之间只有一个回路,这种电源比较简单,容易调整,适用于加工一般型腔模具。后者加在电极和工件之间有两个不同电压的回路(也称高低压复合回路),它比简… 相似文献
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Yinsheng Fan Chaojiang Li Jicheng Bai Qiang Li 《The International Journal of Advanced Manufacturing Technology》2014,72(9-12):1687-1691
Wire electrical discharge machining (WEDM) is widely used in aerospace, mold manufacturing, automotive, and other fields. But now, traditional WEDM pulse power contains current-limiting resistor, and its energy utilization rate is low. Meanwhile, discharge energy of WEDM pulse power cannot be accurately controlled, and there is no unified understanding of distribution about discharge energy. In this paper, the pulse power improves energy utilization rate by removing current-limiting resistor and adopting single-arm pulse width modulation control method which controls peak current and modulates long short-circuit pulse width. Experiments proved that the energy-saving pulse power improves energy utilization rate by, approximately, 67.6 % than traditional pulse power. The paper analyzed a single-pulse energy waveform of the energy-saving pulse power and calculated each spark pulse energy and total energy provided by pulse power. It found that gap spark discharge energy only accounted for about 51 % of the energy provided by the pulse power, and other energy was mainly consumed in switching loss of power switch and parasitic resistance of pulse power. 相似文献
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本文简介了低频电源的应用背景,交-交变频器的实现原理.以及整个系统的软硬件实现。设计采用4个Intel公司MCS-8097BH单片机来实现控制回路的调频调压、三相触发脉冲的产生以及无环流的实现。利用微机系统与外围电路的接口,实现了对生产工艺过程的控制.并具有一定的安全监测和保障功能。 相似文献
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S. S. Mahapatra Amar Patnaik 《The International Journal of Advanced Manufacturing Technology》2007,34(9-10):911-925
Wire electrical discharge machining (WEDM) is extensively used in machining of conductive materials when precision is of prime importance. Rough cutting operation in WEDM is treated as a challenging one because improvement of more than one machining performance measures viz. metal removal rate (MRR), surface finish (SF) and cutting width (kerf) are sought to obtain a precision work. Using Taguchi’s parameter design, significant machining parameters affecting the performance measures are identified as discharge current, pulse duration, pulse frequency, wire speed, wire tension, and dielectric flow. It has been observed that a combination of factors for optimization of each performance measure is different. In this study, the relationship between control factors and responses like MRR, SF and kerf are established by means of nonlinear regression analysis, resulting in a valid mathematical model. Finally, genetic algorithm, a popular evolutionary approach, is employed to optimize the wire electrical discharge machining process with multiple objectives. The study demonstrates that the WEDM process parameters can be adjusted to achieve better metal removal rate, surface finish and cutting width simultaneously. 相似文献
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Improvement of wire electrical discharge machining efficiency in machining polycrystalline silicon with auxiliary-pulse voltage supply 总被引:2,自引:2,他引:0
Po-Huai Yu Yang-Xin Lin Hsiang-Kuo Lee Chao-Chuang Mai Biing-Hwa Yan 《The International Journal of Advanced Manufacturing Technology》2011,57(9-12):991-1001
This study proposes a novel pulse voltage configuration, auxiliary-pulse voltage, for wire electrical discharge machining (WEDM) of polycrystalline silicon (polysilicon) used in solar cell production. It is developed with the objectives of reducing material waste due to the large kerf loss as well as achieving greater efficiency and better quality compared with conventional machining approaches. Experimental results show that compared with conventional-pulse voltage supply, the auxiliary-pulse voltage mode can avoid delay in electrical discharge during pulse-on time. Enhanced frequency of effective discharge for machining would increase machining speed, which would in turn reduce machining groove width, and obtain better surface roughness. In addition, parameters of significant influence on machining characteristics were examined with the Taguchi method, and the optimal combination levels of machining parameters were determined. In sum, our findings reveal that WEDM with auxiliary-pulse voltage supply is an effective approach to machining polysilicon with good quality and high efficiency achieved. 相似文献
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Roy Abhinaba Narendranath S. Pramanik Alokesh 《Journal of Mechanical Science and Technology》2020,34(10):3957-3961
Journal of Mechanical Science and Technology - This study considers the effect of wire electro discharge machining (WEDM) parameter peak current (Ip) and pulse peak voltage (Vp) on the machined... 相似文献
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介绍一种由一台计算机实时监控多台开关电源充电系统的实现方案,采用了RS 485串行通信总线标准接口,实现了计算机可以实时采样和设置电源输出电压、输出电流和各个开关量的状态,实时进行参数检测、告警。 相似文献
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