数控电火花线切割加工工艺研究

通过分析数控电火花线切割加工的原理，介绍了数控电火花线切割加工的特点及其应用，对数控电火花线切割加工工艺进行了研究和探讨，并对数控电火花线切割中常见的问题，提出了处理意见。     

新型中走丝线切割工作液的研制

根据中走丝电火花线切割加工的特点,研制出一种新型中走丝电火花线切割工作液。分析了中走丝电火花线切割工作液性能对加工的影响,探讨了工作液的组成和各种添加剂的选择。加工试验表明,研制的走丝电火花线切割工作液符合中走丝电火花线切割加工特性和防锈要求,能在高加工效率下加工得到较高表面质量的工件。     

工件超声振动电火花线切割复合加工试验研究

借助ANSYS软件对变幅杆、夹具和工件进行整体的动力学研究,设计了一套超声振动电火花线切割复合加工装置。在相同加工参数下,分别采用工件超声振动电火花线切割复合加工和传统的电火花线切割加工对45钢进行切割试验。试验结果表明:与传统的电火花线切割加工相比,超声振动电火花线切割复合加工的效率提高了约15%,表面粗糙度减小了约10%。     

基于电火花线切割的金属工艺品创新制作

介绍采用电火花线切割加工技术,用CAXA线切割软件生成电火花线切割加工轨迹及数控代码,控制电火花线切割机床切割加工出金属工艺品。创新了金属工艺品加工方法,实现了工艺过程的数字化、自动化。     

电火花线切割五轴联动加工运动规律及仿真研究

为研究空间曲面的加工过程和规律,提出电火花线切割五轴加工计算机仿真技术研究方法.分析了空间曲面电火花线切割加工的特点及运动规律,建立了电火花线切割多轴加工系统运动的数学模型.通过运行相应的仿真程序,可以在计算机上直接观察到电火花线切割加工的全部过程,获得了比较理想的仿真结果.仿真所得到的理想加工参数为复杂零件加工提供了理论基础.从而拓宽了电火花线切割加工的工艺范围,解决了空间曲面零件的加工难题.     

浅析电火花线切割加工和电火花成型加工的特点

本文通过电火花线切割加工和电火花成型加工的三要素,电火花加工和铣削加工的比较,电火花线切割加工和电火花成型加工的共同特点和不同特点的阐述,从不同角度分析了两种不同的电火花加工方法的特点,对实际加工方法的选择和应用起到了指导作用。     

浅析电火花线切割加工和电火花成型加工的特点

本文通过电火花线切割加工和电火花成型加工的三要素,电火花加工和铣削加工的比较,电火花线切割加工和电火花成型加工的共同特点和不同特点的阐述,从不同角度分析了两种不同的电火花加工方法的特点,对实际加工方法的选择和应用起到了指导作用。     

上下面异型零件加工新工艺

对液压元件中衬套、阀套上下面异型的加工新工艺——电火花线切割进行了介绍,结合典型零件描述了其采用电火花线切割时的编程方法,并简单介绍了电火花穿孔成形加工与电火花线切割的原理与应用。改用电火花线切割加工后,不仅消除了电火花加工时出现的“喇叭口”现象,满足了零件精度要求,而且提高了加工效率,使型槽的加工时间由120min缩短至24min,并节省了电板制造费用及生产准备时间。     

探讨高速走丝电火花线切割加工断丝故障分析及预防

高速走丝电火花线切割加工能够满足我国模具制造以及机械加工的需要,但是在高速走丝电火花线切割加工的过程中容易出现断丝的情况,这对于快速的机械加工以及模具制造而言有着非常大的影响。详述高速走丝电火花线切割加工的原理、高速走丝电火花线切割加工断丝的故障原因以及高速走丝电火花切割加工中断丝故障的解决方法及预防。对于高速走丝电火花线切割加工中断丝的情况要进行分析并预防。     

基于特征事件的数控电火花线切割加工工艺过程建模及能耗计算

为了科学准确地分析数控电火花线切割加工工艺过程的电能消耗情况,实现对线切割加工工艺过程的准确描述,提出一种基于特征事件的数控电火花线切割加工工艺过程建模方法。根据数控电火花线切割加工工艺过程特性,将加工工艺过程分解为5类典型事件和4类典型特征;结合正常加工时的运动特性,总结了正常加工时的9种基本事件和14种基本特征,并从NC代码中提取工艺过程的事件及能耗特征,实现了对加工工艺过程的建模。在该模型基础上,利用特征事件实现了数控电火花线切割加工工艺过程的能耗计算,为后续优化数控电火花线切割加工工艺奠定了理论基础。结合某典型凸模零件电火花线切割加工工艺过程进行验证,估算了该零件的加工工艺过程能耗。     

基于数控刀位轨迹的电火花成形加工中电极平动补偿和修正

在电火花成形加工(EDM)中,电极的平动产生了加工误差。针对EDM中电极平动的不同类型,提出并实现了基于数控刀位轨迹的电极平动补偿修正方法。该方法根据EDM的电极平动类型和平动量对用于电极加工的数控程序进行补偿处理,达到对电极平动进行修正的目的,从而减少电极平动所产生的加工误差。试验表明,该方法可以有效地提高EDM加工精度、保持加工质量的稳定性以及降低劳动程度和缩短生产周期。     

差动往复式微型电火花加工装置的研究

针对电火花加工技术的特点及超声波电动机驱动技术的特性,研制了基于线性步进式超声波电动机的差动往复式微型电火花加工装置,分析了该装置的工作原理,提出了电极差动往复式移动的驱动控制方法,实现了电极的差动往复式进给.该装置的外形尺寸为45mm×20mm×40mm.试验结果表明,该装置适合小孔电火花加工.     

线切割加工条件对模具零件表面粗糙度的影响

为改善快走丝电火花线切割加工的表面粗糙度,提高模具加工的质量和使用寿命,分析了快走丝电火花线切割加工条件中放电参数、工作液和电极丝对零件表面粗糙度的影响,并在此基础上提出了改善零件表面粗糙度的相应措施和方法。     

微通道结构带状电极电火花加工方法研究

针对大厚度、高深宽比金属微通道结构加工的难题,提出一种带状电极电火花加工方法,利用厚度30～100 μm的带状电极,在金属基体上高效制造微通道结构。研究了带状电极电火花加工机理,建立了带状电极在加工间隙中的运动模型,分析了影响带状电极运动的主要因素,搭建了带状电极电火花加工装置,开展了微通道结构带状电极加工实验研究,获得了带状电极电火花加工基础工艺规律。利用带状电极电火花加工方法成功加工出的具有200条微通道的反应器结构和44×45微换热器阵列结构,表明带状电极电火花加工可以实现窄宽度(100 μm以下)、大厚度(35 mm以上)、高深宽比(10以上)和高精度(缝宽标准差3 μm以内)的大批量微通道结构的高效加工,相关方法和技术有望在微模具、微散热器、微反应器等领域获得推广和应用。     

微细电火花加工技术的研究进展

研究和综述了微细电火花加工技术的研究现状和发展趋势。比较分析了常用微细加工与微细电火花加工方法的特点及应用，论述了线电极电火花磨削技术的原理及在微细加工中的作用。结合电火花加工过程中无宏观作用力的特点，论述了微细电火花加工装置微小型化的可行性和几种主要形式。     

Research of micro EDM/ECM method in same electrolyte with running wire tool electrode

A micro rod machining method which can switch between electrical discharge machining (EDM) and electrochemical machining (ECM) by attaching/detaching a diode to/from a bipolar pulse generator in parallel to the working gap was newly developed using a wire electrode made of tungsten. The problem of the wire electrode wear was eliminated by the use of the wire electrochemical turning (WECT) method in which the tungsten wire electrode is continuously running. The ultra-short bipolar pulse current was generated by the electrostatic induction feeding method where a pulse voltage is coupled to the working gap through a feeding capacitance. The machining characteristics of three types of wire guide; disk-shaped WC guide, laminated wire guide and cylindrical acrylic guide, were studied. The experimental results showed that the cylindrical acrylic guide has the best machining characteristics without the influence of guide wear and with less stray current flowing through the working gap. Using the cylindrical acrylic guide, the influences of the feeding capacitance C₁, and the total amplitude of the pulse voltage on the machining characteristics were studied. Finally, a stainless steel SUS 304 micro-rod with a high aspect ratio of 14 was fabricated efficiently by using the EDM and ECM modes for rough and finish machining in sequence with the same setup, pulse generator, and neutral electrolyte.     

Three-dimensional shaping by dot-matrix electrical discharge machining

This paper deals with a new prototyping method called dot-matrix electrical discharge machining (EDM) with scanning motion. The machining process by the dot-matrix method is similar to printing motion with a dot-impact printer. This method can be applied not only to EDM but also electrochemical machining and forming. A prototype of the machining unit for the dot-matrix method has six feeding devices for thin wire electrodes. The electrodes of 300 μm in diameter are arranged with the pitches of 760 μm. To obtain a smooth surface, a planetary motion in the x-y-plane is added to the feeding of the machining unit in the z-direction, the same area is machined repeatedly, or the machining unit is moved with fine feed. By compensating for the wear of the electrode during the scanning EDM, various shapes with the accuracy of micrometers order can be obtained without a formed tool electrode.     

电火花加工技术的新发展

概括当今火花加工的新的成果及其发展方向,即电火花加工的高速度、高精度和自动化,介绍了电火花加工中的控制技术、机床本体脉冲电源和加工工艺等。     

二维电火花加工放电位置的电位差法在线检测

研究了电火花加工放电位置的电位差法在线检测,推导了长方体电极下表面上任意点放电的电位差表达式,绘制了电位差与放电位置的关系曲线。在y＝0时的一维情况下与现有试验结果进行了对比研究。     

Approaches for improvement of EDM cutting performance of SiC with foil electrode

Electrical discharge machining by foil electrode serves as an alternative method for SiC slicing. This technology uses a highly tensioned thin foil as the tool electrode. The main advantages over wire EDM are that the foil thickness can be made smaller than the wire diameter, vibrations can be avoided by applying high tension, and higher current can be supplied since there is less risk of tool breakage. However, due to the large side surface area of the foil electrode, there is a high occurrence probability of side surface discharges and high concentration of debris, which affects kerf width accuracy and machining stability. In the aim to overcome both problems, this study proposes two foil electrode designs: a foil electrode in which holes are machined and the insulation of the side surface areas by a resin coating layer of 5 μm thickness. The influences of both foil electrodes were tested with three different slicing strategies: no strategy, applying jump motion of the tool electrode, and applying reciprocating motion. From machining experiments and comparative studies of the discharge delay time, it was found that with both foil tools, the occurrence probability of side surface discharges can be reduced. In addition, the chip pocketing effect of the holes enhance the flushing conditions, resulting in a higher cutting speed.