气中高速走丝电火花线切割放电状态的研究

气中电火花线切割加工是电火花线切割精加工的发展趋势.因此对气中电火花放电状态的检测是电火花线切割加工过程中极为重要的一个环节,文中介绍了利用放电状态时不同的电压波形对放电状态进行区分并分析了它们的特点.     

第十二届中国国际机床展览会特种加工机床评述（下）

二、电火花线切割机床（WIRE-CUT）1.国外单向走丝电火花线切割机床国外单向走丝电火花线切割机床的技术发展水平,着重针对电火花线切割加工特点及应用情况,在脉冲电源、自动控制及主机结构等影响线切割加工三大指标的几个关键功能部件上有所创新,并且在实用性、稳定性、可靠性,以及各功能模块的自适应控制性能等方面有所提升（1）脉冲电源技术高效电火花脉冲电源是单向走丝线切割机床的核心单元,高频脉冲电源的自适应控制策略的优劣,对单向走丝线切割的加工效率、加工精度,     

基于PWM技术节能型线切割脉冲电源的研制

分析了线切割脉冲电源电能的利用现状，简要介绍了目前节能型电火花脉冲电源的研究情况。研制了一种新型的节能型线切割加工脉冲电源。并对其原理进行了探讨。     

新型微能可控的MWEDM脉冲电源

分析了以往的微细电火花线切割加工(MWEDM)脉冲电源的不足。在现代电力电子技术基础上，开发出新型微能可控的微细电火花线切割加工脉冲电源。试验表明，这种高质量的脉冲电源为改善微细电火花线切割加工整体性能、拓展加工领域提供了技术保证。     

电火花线切割加工工艺的特点

1 引言 线切割加工是电火花线切割加工的简称,是用线状电极(钼丝或钨丝)靠电火花放电来对工件进行切割.     

单片机在电火花加工控制中的应用

本文介绍一种采用MCS-48系列单片机,用作电火花加工智能化控制的方法。一、工作原理电火花加工是利用脉冲电源使工具电极和工件间脉冲放电时产生的蚀除现象对材料进行加工的一种加工工艺(如图1), 由于脉冲电源放电时电极和工件间的间隙非常小,一般精加工时仅有几至几十微米的距离,而稳定加工时要求在2-5μm范围内变化,而且由于加工时工件不断被蚀除,工具电极也有一定程度的损耗,所以间隙在正常加工时也将不断增大。为了保证良好的加工状态,加工间隙就必须靠工件不断进给调整。如果间隙调整过量或由于加工中产生的残渣而使间隙过小,会引起电弧放电或电极短路,严重影响加工过程和加工产品的质量,甚至于使加工无法进行,所以要始终控制保持良好的加工状态是比较困难的。目前,生产中大量     

电火花线切割机床高频电源的使用

在火花放电过程中,脉冲电压是产生电火花放电的必要条件,而高频电源就是产生脉冲电压的一个大功率高频脉冲信号源,又称脉冲电源（以下通称为高频电源）,它是数控线切割机床中的一个重要组成部件。在一定条件下,线切割机床的加工效率往往取决于高频电源的性能,因此,在使用过程中高频电源显得尤为重要。下面根据笔者的经验谈谈对高频电源的一些认识。     

基于统计分析的电火花线切割加工稳定性研究

研制了电火花线切割加工间隙放电状态检测系统,并运用时序分析理论中的统计检验的方法对加工中由正常放电相对时间比率值构成的时间序列进行了分析,指出了电火花线切割加工稳定时的正常放电相对时间比率值构成的时间序列的统计特征。提出用量纲一波形参数——峰度值（峭度系数）来判断电火花线切割加工的稳定性,用试验的方法研究了该方法的可靠性,为采取适当的电参数控制策略,提高加工稳定性提供了重要的依据。     

单脉冲电火花加工电源的设计

单脉冲放电对电火花放电加工机理的研究具有重要的意义,通过对单脉冲放电凹坑的研究可以定性或是定量地分析蚀除率、表面粗糙度与电参数的关系.适合于课题研究目的的单脉冲放电电源是对单脉冲电火花加工机理深入分析的关键,详细地介绍了一种实验室单脉冲电源的制作方法.     

电火花线切割加工工艺特点分析

线切割加工是电火花线切割加工的简称,它是用线状电极(钼丝或钨丝)靠电火花放电来对工件进行切割。线切割机床通常分为两类:快走丝和慢走丝。前者     

Development of parallel spark electrical discharge machining

This paper describes the development of parallel spark EDM method. In the discharge circuit, the electrode is divided into multiple electrodes, each of which is electrically insulated and connected to the pulse generator through a diode. A capacitor is inserted parallel to each discharge gap between each electrode and workpiece (here workpiece is common for each electrode). Compared with conventional EDM in which only a singular discharge can be generated for each pulse, multiple discharges can dispersively be generated for each pulse in parallel spark EDM. Results of experiments on parallel spark EDM and conventional EDM show that not only is the machining process more stable, but the machining speed and surface roughness can also be improved with parallel spark EDM.     

提高模具电火花加工切割形状精度的途径

电火花线切割是模具零件的主要加工方式。模具加工精度包括表面粗糙度、形状位置精度和尺寸精度,慢走丝线切割难以控制表面粗糙度和形状精度。影响数控电火花线切割加工精度的因素主要有偏移量、取件位置、切割路线、起点、装夹与定位及引入、切出、超切、回退程序等。通过进行合理的工艺分析,正确计算数控编程中电极丝的设计走丝轨迹,可确保模具的加工精度。通过确定穿丝孔和优化切割路线来改善切割工艺,是提高模具型腔切割质量和生产效率的一条行之有效的重要途径。     

数控电火花成型机的自适应控制技术研究

针对数控电火花成型机中电火花加工间隙放电过程难以控制的问题,提出基于电火花加工间隙状态的识别和合理的伺服进给系统的电火花自适应控制技术。通过正确的间隙检测方法,配以专家系统和决策控制软件,保证数控电火花成型机的工作可靠和安全,并使长期无人控制操作成为可能,从而为数控电火花成型机的自适应控制技术研究提供了理论依据。     

Optimization of wire electrical discharge machining (WEDM) process parameters using Taguchi method

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.     

An experimental study on micro wire-EDM of polycrystalline diamond using a novel pulse generator

This paper presents a new pulse generator for cutting of polycrystalline diamond (PCD) by micro wire electrical discharge machining (micro wire-EDM). The pulse generator using anti-electrolysis circuitry and digital signal processor-based pulse control circuit was developed to suppress damages on the machined surface of PCD while achieving stable machining. A novel pulse control method was proposed to provide high-frequency pulse control signals with a period of off duty cycle for reionization of the dielectric in the spark gap so as to reduce the consecutive occurrence of short circuits. A series of experiments were carried out to investigate the effect of open voltage on machining performance in terms of material removal rate, slit width, thickness of the damaged layer on machined surface, and surface finish. An increase of open voltage increases peak current, thus producing greater discharge energy and, thereby, contributing to improvements in material removal rate, but leading to larger slit width and thickness of the damaged layer and worse surface finish. Experimental results not only demonstrate that the developed pulse generator could achieve satisfactory machining results but also have verified the applicability of this new technique in micro wire-EDM.     

Simple spark erosion device based on optical disk or hard disk drive actuators

We present the design of a compact electric discharge device incorporating hard disk or optical disk drive actuators. It is simple enough to be assembled in the absence of a mechanical workshop. The electronic circuit allows the adjustment of current, voltage, and discharge power. The system has been tested with organic dielectric liquids and deionized water and spark conditions; dynamic properties and machining characteristics were investigated. This device can be used to shape materials or to produce powdered samples with low material loss and minimal liquid consumption.     

复合运丝型电火花线切割加工参数分析与研究

提出了一种新型电火花线切割机床,即电极丝作往复直线运动的同时还绕自身轴线高速旋转的复合运丝型线切割机床。介绍了该类机床与其他线切割机床加工的基本工艺指标。通过与高速走丝电火花线切割机床比较实验,分析了脉冲宽度、脉冲间隔、脉冲峰值电流等电参数对加工工艺指标的影响,实验表明这种独特的复合运丝方式在降低表面粗糙度、提高加工精度等方面较传统运丝方式具有较大的优越性,且机床结构较为简单,对于各种工艺参数和电参数具有更加广泛的适用性,具有进一步研究和推广价值。     

Modeling and multiresponse optimization on WEDM for HSLA by RSM

Wire electric discharge machining (WEDM) is a nonconventional machining method to cut hard and conductive material with the help of a moving electrode. High-strength low-alloy steel (HSLA) is a hard alloy with high hardness and wear-resisting property. The purpose of this study is to investigate the effect of parameters on cutting speed and dimensional deviation for WEDM using HSLA as workpiece. It is seen that the most prominent factor for cutting speed and dimensional deviation is pulse-on time, while two-factor interactions play an important role in this analysis. Response surface methodology was used to optimize the process parameter for cutting speed and dimensional deviation. The central composite rotatable design was used to conduct the experiments. The analysis of variance was used for the investigation of significant factors.     

一种基于模糊神经网络确定电火花加工条件的新方法

在电火花加工中,影响因素较多,难以确定最优加工条件。应用模糊神经网络确定电火花加工条件是一种新的尝试,它可以充分发挥模糊逻辑和神经网络的长处。为方便操作者决定粗加工最优加工条件,并提高表面加工效果和粗加工速度,本文提出了一种基于模糊神经网络自动确定和优化电火花成形加工中加工参数的方法。经实践证明,用该方法所确定的最优加工条件,能保证较高的粗加工速度,方便了操作者对加工条件的确定。     

往复走丝电火花线切割高效低损耗切割研究

目前,高速往复走丝电火花线切割最高切割效率已突破200mm2/min,传统脉冲电源靠单纯提高脉冲能量来增加切割效率会导致钼丝损伤大、损耗加剧,短时间内就可能出现断丝。从脉冲电源的放电波形分析入手,分析了传统脉冲电源和高效低损耗脉冲电源的差异。研究认为,采用阶梯脉冲合理控制放电电流的前后沿,在加工中对非正常放电脉冲及时切断以减小对电极丝造成的损伤及损耗,采用等能量脉冲方式提高放电利用率等措施能大大提高切割效率,改善切割表面粗糙度,在切割效率190～200mm2/min条件下能实现长期稳定切割。