电刷镀修复模具的应用研究

为了延长模具零件的使用寿命,可对模具零件进行多次修复以达到再利用,以防止资源浪费、节约成本。以案例形式阐述电刷镀技术在模具修复中的实际应用,说明通过该技术如何使得模具零件能过修复得以再利用。     

应用电刷镀修复机床导轨

我地区机械系统从1985年开始推广应用电刷镀(又称金属电刷镀)技术,在修复各种零件尤其在修复机床导轨方面,取得了显著效果。现将修复 T68镗床导轨的电镀工艺简单介绍如下:一、电刷镀技术的特点金属电刷镀是采用快速电化沉积金属渣的方法,在金属工件表面涂以镀层。具有设备简单、工艺灵活、电镀速度快、镀后一般不需再加工等特点。是国家“七五”、“八五”期间重点推广的新技术之一。     

脉冲式电刷镀模具强化工艺

脉冲式电刷镀模具强化工艺北京市青院电器设备厂周建忠，刘宗祥目前，对型腔模具表面强化已有很多方法，但因工艺复杂，投资高或因提高了硬度而降低光洁度等缺陷而不能广泛应用。电刷镀强化模具是一种先进的技术，不受工件材料的影响，尤其是对尺寸超差模具的修复，提供了...     

模具的修复技术与应用

针对模具表面磨损、表面剥落、表面裂纹等失效形式,介绍了热喷涂、电刷镀、堆焊、激光修复等维修技术,以达到延长模具使用寿命、降低成本、提高经济效益的目的。     

1Cr18Ni9Ti不锈钢件的刷镀工艺方法研究

电刷镀技术是近年来发展起来的机械零部件修复新技术。本文研究了电刷镀技术在奥氏体不锈钢零部件表面损伤修复中的应用,提出了电刷镀修复奥氏体不锈钢件的工艺流程及条件。     

一种冷挤压模具的综合修复

介绍用电火花强化恢复模具尺寸精度 ,并用电刷镀降低强化层表面粗糙度值两种工艺方法对冷挤压模具进行综合修复。修复后的冷挤压模具有更好的使用性能并延长模具寿命     

脉冲电刷镀技术与应用 HL—MD—Ⅰ型多功能金属表面强化设备简介

随着科技的发展,普通的电刷镀设备满足不了新工艺、新技术以及具有高强度、高硬度和高质量的零件修复的需要,为此,我们根据国家机械委下达的科研任务研制出新一代的电刷镀设备HL—MD—Ⅰ型多功能金属表面强化设备。 1.普通电刷镀设备存在的问题用一般的电刷镀设备刷镀模具时,镀层强度不牢固;电流稍高,表面结晶颗粒就显得粗糙;对于型腔     

电刷镀修复不锈钢转轴的工艺与探讨

采用电刷镀工艺 ,对不锈钢电机转轴进行修复 ,首先介绍了电刷镀技术 ,然后具体阐述了电刷镀的工艺流程和所采用的合理金属镀层 ,精确、快速的修复方法 ,最后介绍了在操作过程中应注意的问题     

合金调质钢件的电刷镀工艺

研究了电刷镀技术在合金钢件表面损伤修复中的应用,提出了电刷镀修复合金调质钢件的工艺流程及条件。     

电刷镀技术在汽车汽缸再制造中的应用

针对汽车汽缸壁磨损和材料疲劳引起的失效，采用电刷镀技术进行修复能够使汽缸恢复到正常的适用状态。文章对电刷镀机技术的工艺特点及其在汽车汽缸再制造中的应用进行了探讨。     

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.     

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。     

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....     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.