漂洗冲洗联用槽的制作和应用

电镀零件出槽后经镀液回收后,需经清水漂洗和冲洗两道工序,如单独设置漂洗和冲洗槽,势必增大用水量,扩大占地面积,相应地增加了废水处理量。为此,我厂设计了一个漂洗、冲洗联用槽,使用效果良好。一、联用槽的结构及使用方法联用槽的结构见图。它是在普通流动清洗槽的基础上改装而成的。具体方法是:在槽的两内侧上方加装两条喷水管,槽边安装脚动闸阀,以控制喷     

钾盐光亮镀锌工艺

钾盐光亮镀锌工艺是目前工业上较为理想的电镀新工艺。现根据生产实践经验和有关资料，将该工艺的主要技术特性、镀锌镀液的配制、镀液成分和操作条件的影响、镀液的维护以及镀液中有害成分的去除等内容介绍如下。一、钾盐光亮镀锌工艺的主要技术特性1．阴极电流效率不低于98％。2．镀液的沉积速度镀层厚度可达32μm／h，最厚能达35μm/h。3．分散能力20℃赫尔槽试总电流1A，赫尔槽两点测定分散能力是，亚号光亮剂为24％，2号光亮剂为28．4％。4．深镀能力采用φ10mm通孔钢管，外部绝缘并正对阳级，在30℃倾斜放置的条件下，当电镀时间为20…     

氯化钾镀锌控制方法的研究

本文根据电沉积理论和金属镀锌的阴、阳极极化行为的分析，同时结合氯化钾镀液的特点，提出用新的电镀控制方法－－恒槽压法，采用恒槽压法控制金属镀锌，与恒电流控制比较，其镀层质量明显优于恒电流的镀层。     

电镀金刚石丝锥的加工工艺

对电镀金刚石丝锥的加工工艺进行了研究,给出了电镀金刚石丝锥的制造过程,主要包括镀液的配制、金刚石的清洗、上砂槽的制作、试件的镀前处理、预镀、上砂、增厚处理等。通过大量的实验研究和数据分析,重点讨论了电镀工艺参数、主盐浓度对镀层硬度和沉积速度的影响。     

零部件机械镀锌工艺的工业生产现状及展望

钢铁零部件采用电镀锌和热浸镀锌存在许多问题．机械镀锌是一种清洁生产工艺．机械镀锌工艺不仅能满足零部件的防腐蚀功能，而且克服了电镀和热浸镀中的不足，箱体内壁的机械镀锌拓宽了机械镀锌的应用领域。     

用“联合净化法”处理光亮镀镍溶液

在Cr/Ni和Ni/Cu/Ni/Cr等防护-装饰性多层电镀体系中,很多单位采用光亮镀镍为中间镀层,代替抛光工序,节约电镀及抛光材料,实现电镀一步法生产,因此光亮镀镍得到了普遍地重视和应用。光亮镀镍溶液在使用一段时间后,因挂具、零件带入少量其他溶液的污染;零件落入镀槽中而未及时捞出;添加的化工原料纯度不够;有机添加剂的分解等,均会造成镀液中铜、铁铬等金属杂质和有机分解物质的积累。当杂质     

锌酸盐电沉积锌镍合金工艺研究

本文重点研究了锌酸盐电沉积锌镍合金的镀液组成及工艺条件；各因素对镀层合金成分的影响，并测试了镀液和镀层性能；最后得到了比较理想的电镀镍合金工艺。     

直线式镀锌生产线控制系统的全面升级

正我公司的一条镀锌生产线通过人工点动控制槽边行走龙门起重机,操作人员要跟着槽边行走龙门起重机走,生产效率低,电镀工艺时间难以把握。用可编程序控制器(PLC)改造为半自动生产线控制运行后,生产效率大大提高,人为操作因素减少,在一定程度上提高了工件的镀锌质量。一、镀锌生产线原状直线式镀锌生产线采用槽边行走龙门起重机来回吊运(每     

用测量镀层光泽度方法研究镀镍电解液中添加剂的出光速度

现代的光亮镀镍工艺,不仅要求镀层全光亮、高整平,还要求有很高的出光速度。所谓出光速度,指镀液在很短的时间内使镀层达到很高光泽度的能力,即是说,在一定粗糙表面或较低光泽度的基体表面上,用一定的工艺条件电镀数分钟后所能达到的光泽度值。本文采用赫尔槽试片,电镀10分钟,每隔2分钟在一定的电流密度位置上测量镀层的光泽度。用这个方法研究镀镍电解液中某些添加剂,包括光亮剂、整平剂对镀层光泽度的影响。确定电沉积层光泽度的主要因素。1960年,威尔(R.Weil)就用测量光泽度的     

机电信息

长城电镀厂引进先进电镀生产线肖伟发报道:上海长城电镀厂努力改造旧设备。去年该厂从英国NAPCO公司引进了一条滚式镀锌生产线,现已安裝调试完毕,投入试生产。该条镀锌生产线由计算机控制,实现了全自动,它包括从自动上料到液镀钝化直至甩干下料等全部工序,且还带有一套自动废水处理装置。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.