脉冲电化学光整加工机理及其应用

提出了脉冲电化学光整加工新概念 ,分析了脉冲电化学光整加工机理 ,确定了应用脉冲电源、非线性电解液、高频窄脉宽技术的光整加工工艺方案。通过工艺试验和实际应用验证了工艺方案的可行性和优越性。     

脉冲电化学光整加工的机理及影响因素

论述脉冲电化学光整加工特点，研究脉冲电化学光整加工机理，根据光整加工原理进行实验设计。根据实验得到的优选数据进行加工，有效地降低了表现粗糙度3－5级，达到了光整加工目的。结合实验从理论上分析了影响脉冲电化学光整加工的加工间隙、脉冲电流、流场、电解液的压力和流速以及其它工艺参数等因素。     

脉冲电化学光整加工技术的应用研究

用中性电解液进行脉冲电化学光整加工可获得良好的表面质量,探讨了加工原理和优点,并通过传统光整加工难以加工的应用案例如光亮刻字、深小孔、型面和齿轮齿面等来证明加工效果.结果表明,脉冲电化学光整加工能在数秒钟将表面粗糙度Ra0.4～1.6 μm减小到Ra0.02～0.1 μm.由此可见,该技术将会在现代制造业中发挥更大的作用.     

脉冲电化学及脉冲电化学机械光整加工工艺

介绍了脉冲电化学光整加工及脉冲电化学机械光整加工原理和工艺特点,分析了电化学加工表面和机械加工表面的微观几何形貌对零件的机械性能和使用寿命的影响,表明电化学加工表面的优越性,并对其精度特性进行了分析.     

成型轧辊表面的脉冲电化学光整加工技术研究

针对成型轧辊表面光整加工的需要,将脉冲电化学光整加工技术与数控技术相结合,开发了成型轧辊脉冲电化学光整加工工艺及设备.介绍了装置的构成,以及影响光整效果的主要工艺因素.     

脉冲电化学机械光整加工工艺的基础研究

着重介绍了脉冲电化学机械光整加工工艺的特点,光整加工原理;通过实验验证了这种光整加工工艺与电化学机械光整加工工艺相比,有着高效、高表面质量的优点;分析了脉冲电化学机械光整加工工艺的机理;对这种光整加工工艺目前存在的问题及发展前景进行了探讨。     

脉冲电化学齿轮齿面光整加工实验研究

将脉冲电化学加工原理应用于齿轮齿面光整加工，建立了移动式成形阴极脉冲电化学齿面光整加工实验装置；研究了工作电流密度、阴极移动速度、扫描次数、电解液流速等工艺参量对加工质量及效率的影响，获得了较优的工艺参数；以模数为3mm、齿数为33的直齿圆柱齿轮为实例进行了光整加工实验研究。结果表明，该工艺不仅能在短时间内将齿面粗糙度大幅度降低，而且能显著增加齿面的光亮性。     

脉冲电化学机械光整加工工艺的基础研究

着重介绍了脉冲电化学机械光整加工工艺的特点,光整加工原理;通过实验验证了这种光整加工工艺与电化学机械光整加工工艺相比,有着高效、高表面质量的优点;分析了脉冲电化学机械光整加工工艺的机理;对这种光整加工工艺目前存在的问题及发展前景进行了探讨。     

成形阴极脉冲电化学光整加工技术应用研究

针对将成形阴极脉冲电化学光整加工新工艺应用于V形槽工件的表面光整加工,讨论了影响实际应用中的流场、间隙、电场等关键技术问题及其解决方案.并以实际V形槽工件为例,进行脉冲电化学光整加工,得到了良好效果.实验证明,该工艺应用于V形槽表面的光整加工是成功的.     

脉冲电化学光整加工极间间隙的研究与建模

脉冲电化学光整加工(PECF)工艺是一种新型的光整加工技术,具有加工效率高,成本低,表面质量好等优点.极间间隙是对脉冲电化学光整加工具有重要影响的工艺参数,保持极小的极间间隙加工,可以提高工件的表面光泽度以及加工的尺寸精度.通过模拟计算分析极间间隙过程,建立了最小间隙数学模型.     

Microstructure of electrochemical micromachining using inert metal mask

Electrochemical micromachining (EMM) has been gaining popularity as an alternative method to fabricate microstructure. A method of EMM is proposed to produce microhole array or micro-dimple array, in which a patterned inert metal mask (platinum plate) is closely attached to workpiece (anode), not bonded to the anode. When voltage is applied across the anode and the cathode over which electrolyte flows at a high speed, the patterns in the mask are transferred to the anode, and microstructures are produced. A mathematical model to describe the actual machining process is established. By considering the effect of nonlinear electrolyte, the parametric finite element method is adopted to simulate and numerically analyze the erosion process. Some experiments are performed to verify the proposed model.     

电解质浓度对电沉积中枝晶分形生长的影响

将分形几何与电化学原理相结合,以Microsoft Visual C++6.0为平台,编程模拟了电解质浓度对点电极电沉积和喷射电沉积中枝晶分形生长的影响。采用圆形电解池点电极电沉积的方法,制备了不同浓度下的金属镍枝晶;以平行板金属镍为阳极,石墨板为阴极,用自行设计的试验设备研究了不同浓度时金属镍枝晶二维电沉积生长的行为特性,并分别与模拟结果进行比较。结果表明,电解质浓度变化对电沉积的影响与采用模型模拟所得的结果具有相似性,模拟的结果对电沉积枝晶的试验研究具有很好的指导意义,气泡对沉积产物的形貌影响显著。     

电极平动式电解孔加工技术研究

从电解液流动角度对影响电解孔加工过程的主要原因进行了分析 ,提出利用电极平动来改善电解加工过程稳定性和提高加工精度 ,研制了电极平动系统 ,进行了加工试验。试验结果表明 ,电极的平动运动使得电解液分布变得均匀 ,消除了空穴和分离流等弊端 ,改进了过程稳定性 ,显著提高了加工精度。     

A study of supersonic-aided electrolysis

In this study, a composite processing technology combined with supersonic and electrochemical machining is adapted to etch copper. Rod copper of diameter 3.0 mm is selected as a sample material. A series of experiments of supersonic-aided electrolysis by agitating anode, and electrolyte were carried out to investigate performance for copper etching. Faster metal removal rate can be achieved in supersonic-aided electrolysis machining by agitating either the anode or electrolyte. Removal rate can be raised up to 65% by supersonic-aided electrolysis by agitation both of anode and electrolyte. Deposition speed of cathode is lower in supersonic-aided electrolysis. Machined surface roughness of workpiece by supersonic-aided electrolysis is much better than no agitation.     

采用非线性电解液的叶片电解加工阴极设计

工具阴极设计是航空发动机叶片电解加工工艺过程中的关键环节。本文采用有限元数值算法求解加工间隙内的电场分布,考虑非线性电解液对成型规律的影响,进行叶片的阴极设计计算。对加工间隙分布的分析表明,将非线性电解液的影响带入阴极求解中,能使所研究的问题更接近实际情况,从而能提高阴极设计的精度。     

Effect of interlayer on structure and performance of anode-supported SOFC single cells

To lower the operating temperatures in solid oxide fuel cell (SOFC) operations, anode-supported SOFC single cells with a single dip-coated interlayer were fabricated and the effect of the interlayer on the electrolyte structure and the electrical performance was investigated. For the preparation of SOFC single cells, yttria-stabilized zirconia (YSZ) electrolyte, NiO-YSZ anode, and 50% YSZ-50% strontium-doped lanthanum manganite (LSM) cathode were used. In order to characterize the cells, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were utilized and the gas (air) permeability measurements were conducted for gas tightness estimation. When the interlayer was inserted onto NiO-YSZ anode, the surface roughness of anode was diminished by about 40% and dense crack-free electrolytes were obtained. The electrical performance was enhanced remarkably and the maximum power density was 0.57W/cm(2) at 800 degrees C and 0.44W/cm(2) at 700 degrees C. On the other hand, the effect of interlayer on the gas tightness was negligible. The characterization study revealed that the enhancement in the electrical performance was mainly attributed to the increase of ion transmission area of anode/electrolyte interface and the increase of ionic conductivity of dense crack-free electrolyte layer.     

熔盐电解法制备镁-铝-锶-钙合金新工艺

为解决对渗法制备镁-锶系合金时存在的问题,以SrCl2+CaCl2为熔盐电解质,以熔融镁-铝合金为阴极,采用熔盐电解法制备了Mg-6Al-0.2Sr-0.2Ca合金,研究了熔盐配比、电解温度及电解电压等电解工艺参数对电解过程的影响,确定了最佳制备工艺,并对制备合金的成分、显微组织、物相组成及金属的析出及传输过程进行了分析。结果表明:在镁-铝合金熔体中电解SrCl2+CaCl2可直接制备出镁-铝-锶-钙合金;当SrCl2与CaCl2物质的量比为1∶1时,熔盐具有良好的可电解性能,其适宜的电解温度为750℃,电解电压为4 V;制备的Mg-6Al-0.2Sr-0.2Ca合金中,锶和钙以Al4Sr、Al2Ca等形式存在于基体晶界处。     

一种上进液式铜箔一体机设备

上进液式铜箔一体机设备是一种新型的铜箔生产设备,主要包括阴极辊、阳极槽、电解液输送装置、电解液回流接收装置等,它与传统的铜箔生产设备不同之处在于,将传统设备的“下进液式”电解液由下而上的流动,改为“上进液式”电解液由上而下的流动,并在电解液流入端口设有流量调节装置,从而提高了电解液的流动速度和平稳性,也使铜箔的均厚得到很好的控制。     

Cutting tool wear monitoring for reliability analysis using proportional hazards model

Electrochemical machining (ECM) is an important technology in machining difficult-to-cut materials and to shape free-form surfaces. In ECM, material is removed by electrochemical dissolution process, so part is machined without inducing residual stress and without tool wear. To improve technological factors in electrochemical machining, introduction of electrode tool ultrasonic vibration is justifiable. This method is called as ultrasonically assisted electrochemical machining (USAECM). In the first part of the paper, the analysis of electrolyte flow through the gap during USAECM has been presented. Based on computational fluid dynamic methods, multiphase, turbulent and unsteady electrolyte flow between anode and cathode (under assumption that cavitation phenomenon occurs) has been analysed. Discussion of the obtained solutions is the base to define optimal conditions of electrolyte flow in case of USAECM process. The second part of the paper is connected with experimental investigations of USAECM process. Classic experimental verification of obtained results in case of machining is extremely difficult, but influence of the ultrasonic vibration can be observed indirectly by changes in technological factors (in comparison to machining without ultrasonic intensification), whereas results of numerical simulation give possibility to understand reason and direction of technological factors changes. Investigations proved that ultrasonic vibrations change conditions of electrochemical dissolution and for optimal amplitude of vibration gives possibility to decrease the electrode polarisation.