展成电解加工中的内喷式阴极设计

论述了展成电解加工中的内喷式阴极设计原则。结合整体叶轮的加工，介绍了阴极结构形成式选择和尺寸设计，并在工艺实验中得到检验。     

展成电解加工中的内喷式阴极设计

论述了展成电解加工中的内喷式阴极设计原则。结合整体叶轮的加工,介绍了阴极结构形式选择和尺寸设计,并在工艺实验中得到检验。     

数控展成电解加工整体叶轮的阴极设计

提出了展成电解加工的内喷式阴极设计原则。对用于直纹面扭曲叶片整体叶轮加工的阴极进行了结构设计．推导了底板尺寸计算公式。     

涡轮叶片电解加工阴极设计方法研究

电解加工技术是目前航天航空发动机核心零部件涡轮叶片的主要加工方法之一.叶片电解加工工具阴极设计方法与修正是提高叶片电解加工精度的关键.电解加工中阴极进给角度、工件装夹角度和工件型面法线方向夹角的规范性和均匀性是影响阴极设计准确性的重要因素.分析某小型发动机涡轮转子叶片三维模型结构,建立叶片型面上各采样点对应的阴极工具型...     

数控展成电解加工整体叶轮的阴极设计

提出了展成电解加工的内喷式阴极设计原则，对用于直纹面扭曲叶片整体叶轮加工的阴极进行了结构设计，推导了底板尺寸计算公式。     

带冠整体叶轮数控展成电解加工阴极的设计

带冠整体叶轮数控展成电解加工预通道是电解加工技术的拓展应用，阴极设计是关键技术之一。介绍了近似成形阴极设计的基本方法、原则，分析了带冠整体叶轮叶片型面数据的处理方法，确定了阴极结构、形状及主要尺寸的设计步骤。     

膛线电解加工阴极结构的发展

随着炮管材料变硬,膛线数目增多,线槽变深,缠角变大,机械拉削难以实现膛线的加工.因电解加工具有一次成形、阴极不损耗、生产效率高、无切削应力的优点,故逐渐采用电解加工的方法来加工膛线.介绍了固定式阴极和移动式阴极的膛线加工,重点阐述了圆柱形阴极、圆锥形阴极、组合式阴极和三面进给式移动阴极的应用.     

方形阴极数控电解加工工艺试验研究

采用4种不同方案的方形阴极进行电解加工工艺试验,并对正交试验结果进行极差分析,得到工作电压、阴极进给速度、电解液压力、初始间隙对切削深度的关系曲线.通过比较4种不同方案阴极对切削深度的影响,得出最优的阴极结构.在此基础上,选取合适的工艺参数组合,进行方孔的电解加工试验.     

内喷式阴极展成电解加工中的流场研究

讨论了内喷式阴极展成电解加工中的流场分布及影响因素,提出了设计方案并进行了实验验证。     

Surface studies in ECM using a relocating machining fixture

This paper deals with the study of the smoothing of the anode surface in electrochemical machining. A relocation fixture-cum-machining setup was used to study the effect of machining time on surface modifications in ECM. Studies on various surface profiles showed that after certain machining, they smooth out to a sinusoidal profile before attaining the final shape. This study using the relocating fixture showed clearly the application of this valuable approach in ECM.     

Study of precision ECM in stationary electrolyte using stamp flushing method

In the interelectrode gap of ECM, the electrolyte flow results in ununiformly distributed temperature and volume fraction of bubbles, leading to uneven distribution of the gap width. This paper aimed to realize high precision ECM using stationary electrolyte. A single current pulse was supplied after every jump flushing motion of the tool electrode. The pulse duration used was set sufficiently short not to cause the boiling of the electrolyte. Furthermore, the stamp flushing method was newly developed to squeeze out the sludge and bubbles from the gap to achieve high precision machining.     

Endothelial cell adhesion and growth within a bioassay chamber using microstamped ECM proteins

Our goal was to evaluate microvascular endothelial cell growth on microstamped patterns of extracellular matrix proteins (ECM). A combination of photo- and soft-lithography was used to make features ∼100 μm deep and 150μm wide. Polydimethylsiloxane imprints of features produced positive molds used to stamp collagen I, IV, laminin and fibronectin onto cleaned hydrophilic or hydrophobic glass coverslips. Human dermal microvascular endothelial cells were seeded at an initial density of 800 cells cm-2, and cultured for three days. Explanted murine aortas, serving as an initial source for autologous endothelial cells, were perfused at 240 μL min⁻¹ for 1 day. Cell morphology was also quantified on both the non-patterned glass and within the microstamped patterns. Viability was high (>90%) on all microstamped proteins, regardless of glass hydrophobicity. Viability was reduced on bare hydrophobic glass. Cell density was 4 or 8 fold higher on microstamped ECM proteins compared with hydrophilic or hydrophobic glass, respectively. Confluence was approached more rapidly on microstamped proteins. Thus, rapid concentrated growth of endothelial cells was markedly enhanced within microstamped ECM patterns on hydrophilic and hydrophobic glass.     

A material removal analysis of electrochemical machining using flat-end cathode

Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the machined profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the machined profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.     

Characteristics of Cu implantation into Si by PBII using UBMS cathode

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍｅｔａｌ ｐｌａｓｍａｂａｓｅｄｉｏｎｉｍｐｌａｎｔａｔｉｏｎ(ＭｅＰＢＩＩ)ｉｓｉｎｔｒｉｎｓｉｃａｌｌｙｄｉｆｆｅｒｅｎｔｔｏｔｈｅｃｏｎｖｅｎｔｉｏｎａｌｇａｓｐｌａｓｍａｂａｓｅｄｉｏｎｉｍｐｌａｎｔａｔｉｏｎ (ＧａＰＢＩＩ)ｄｕｅｔｏｔｈｅｃｏｎｄｅｎｓａｂｌｅｆｅａｔｕｒｅ,ｌａｒｇｅｒｃｏｌｌｉｓｉｏｎｃｒｏｓｓｓｅｃｔｉｏｎａｎｄｍｕｌｔｉｖａｌｅｎｔｉｏｎｃｒｅａｔｉｏｎｏｆｔｈｅｍｅｔａｌｐｌａｓｍａ .Ｔｈｅｒｅａｒｅｓｅｖｅｒａｌｋｉｎｄｓｏｆ…     

Modelling of ECM and EDM processes

The modelling of ECM and EDM processes requires not one but several models to simulate the different phenomena that occur during machining. This paper reviews the models that have been developed to simulate each of these phenomena, e.g. potential models to calculate the current density distribution in ECM, thermal models for the plasma arc in EDM, moving boundary models to simulate the anodic dissolution in ECM and probabilistic models to determine the discharge location in EDM. In addition to discussing the relative merits of the techniques deployed in these models, the paper describes some salient applications and concludes with desirable future enhancements to these models.     

应用数据结构设计液压集成块

本文介绍描述液压回路的数据树结构的基本概念,并阐述应用树结构进行液压集成块设计程序的总体思路。     

民机机匣电解加工设备的研制

国内外广泛采用电解加工工艺进行航空发动机机匣零件的加工。电解加工设备由于自身的特殊性,对密封和防护有着特殊的要求。民机机匣电解加工设备针对民用航空发动机机匣的电解加工而开发。在设备研制过程中,解决了机床工作时X轴加工反力较大,滑枕头及转台(C轴)的密封困难等难题,通过工艺试件的电解加工试验,验证了该设备研制的合理性。     

A flexible textile structure based on polymeric photovoltaics using transparent cathode

This paper presents results for photovoltaic performance obtained from the application of different bulk heterojunction blends onto flexible polypropylene (PP) substrates for textile applications. Organic photovoltaic devices were fabricated onto non-transparent PP tapes and ITO coated glasses. The layer of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) and PEDOT:PSS with 100 nm of silver (Ag) metal layer constituted anode structure and substituted indium tin oxide (ITO) layer in this study. The blends of poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)-propyl-1-phenyl(6,6)C₆₁ (P3HT:PCBM) or poly [2-methoxy-5-(3′,7′-dimethyloctyloxy)-1-4-phenylene vinylene] and 1-(3-methoxycarbonyl)-propyl-1-phenyl(6,6)C₆₁ (MDMO-PPV:PCBM) were utilized as the absorbing materials. The thin metal layers of lithium fluoride (LiF) and aluminum (Al) were deposited on top of the devices by evaporation. All photovoltaic devices were characterized by measuring current–voltage (I–V) characteristics under simulated AM 1.5 conditions. The morphology of these devices using MDMO-PPV:PCBM and P3HT:PCBM blends was also investigated using atomic force microscopy (AFM).     

Fabrication of a probe needle using a tubular cathode by electrochemical etching

To fabricate a probe needle, a tubular cathode was applied by electrochemical etching. A tungsten wire was used as an anode, and a stainless steel tube was used as a cathode, respectively. The stainless steel tube was partially immersed into a sodium hydroxide solution. After the tungsten wire was aligned at the center of the stainless steel tube, electricity was supplied from an external power source. During the experiment, the level of solution that was inside the stainless steel tube rose higher than that of the outer solution of the stainless steel tube, due to bubbles generated on the inner surface of the stainless steel tube, and the inner solution increased in volume. Using this process, the length of the probe needle tapering could be controlled without using a vertical loading system or controller.