基于肘杆机构双输出轴电机驱动的双工位卧式冲压机设计与仿真

采用对称布局的结构,创新设计了一种双输出轴电机驱动的数控双工位卧式冲压机。经仿真试验结果显示,强度符合要求,本卧式冲压机与立式冲压机床相比,具有较小的侧向摩擦力,并且由于重心低,稳定性好,具有比较广阔的应用前景。     

气动机械复合传动双工位冲压机

在以往研究的基础上,创新设计了基于杠杆-双滚轮二级力放大机构的气动-机械复合传动冲压机。这种创新型的冲压机,由于做到了在非常有限的空间内,巧妙地利用杠杆机构的长度效应,和双滚轮机构的角度效应,将气缸活塞产生的推力,经过二级放大后传递到冲压头上,因而,相对于活塞杆直接输出作用力的简单气动冲压机,在结构尺寸一定的条件下,能够显著提高冲压力;而在冲压力一定的条件下,则能够显著减小气缸直径。通过图例介绍了新型冲压机的工作原理,给出了具有工程指导意义和参考价值的力学计算公式及图表。新型冲压机仅仅用一个气缸,就能够实现两个冲压头的顺序作业,不仅生产效率高,而且节能环保。     

浅谈冲压机床的振动缓冲与缓冲器的设计分析

为了有效地削弱冲压机床振动缓冲产生的瞬间冲击与振幅对机械设备的损害,就要根据冲压机床振动缓冲的特点来设计具有良好的吸振性能,降低设备振幅的缓冲器。本文分析了冲压机床的振动缓冲,同时找到致因给出创新且实用的冲压机床的振动缓冲器设计方案。     

卧式单面双工位铣钻组机的设计

针对火车侧架加工的需要,设计了卧式单面双工位铣钻组机,介绍了组机的结构、所采用的刀具和夹具方案。     

卧式单面双工位铣钻组机的设计

为某公司设计了适用于火车支承件侧架加工的卧式单面双工位铣钻组机。介绍其主要结构及使用。     

精密冲压机冲压精度和动压轴承系统的多尺度设计分析

随着制造业对冲压工件要求的不断提高,冲压加工及机床设计也逐渐趋于向微小化、高精度方向发展,如罐体制造、电子元器件及医疗器械微小器件精密成型制造。因此精密冲压机床及其精密动压轴承部件的设计研发,是我国精密成型压力加工和微小零件成型制造领域取得不断突破和发展的关键条件。针对精密冲压机精度设计研究,从跨尺度设计分析的角度分为三个尺度,即机床整体尺度影响、冲压机主传动轴承部件尺度及其运动精度、和冲压零件的加工精度尺度。进一步主要介绍在多尺度设计分析方法指导下,精密动压轴承部件系统主要参数关系的优化设计,运动精度,承载能力,动态温度特性,和精密冲压机整体冲压精度的设计并采用多目标参数优化的方式来实现措施与设计分析过程。     

气动机械复合传动双工位冲压机分析

文章主要是基于研究者们以往的研究成果，对机械负荷传动冲压机进行了分析，该冲压机主要是以气动双滚轮二级力放大机构为基础的。该冲压机的主要优势在于能够在一定的空间范围内，更加有效的将推力传送到冲压头之上。因为该冲压机充分发挥了杠杆原理的放大作用以及双滚轮结构中角度效应。换而言之，就是通过活塞杆的作用，在一定的条件之下可以大幅提升冲压机的压力。相反，得到相同冲压力的情况下，本结构可以对气缸的直径进行一定的缩减。本文中的冲压机在使用一个气缸的情况下，就能完成两个冲压头的工作流程，一方面大大提升了工作效率，另一方面也能降低能耗，对环境的保护做出了一定的贡献。     

基于PLC的多工位组合机床控制系统改造

采用可编程控制器（PLC）技术对卧式多工位组合机床进行改造,并根据生产工艺要求,将各工位及上下料有机地协调工作,提高了生产率和系统的可靠性。介绍了卧式多工位组合机床的工艺和控制要求,以及控制系统的软、硬件设计。     

多工位母线冲压机的改进设计

介绍了多工位母线冲压机的原有机械结构及其存在的问题并对其进行了改进设计.该设备在机械方面由冲孔单元、剪切单元和折弯单元组成,装配于同一工作台上形成三工位,分别完成对铜、铝母线的冲孔、剪切、折弯和压花等工作.将原设备冲孔与剪切单元组合框架结构改进为一体式框架结构,从而改善了母线冲压机的受力方式,提高了系统的动态刚度,模具装卸更方便.     

精打细算

在冲压车间,用低廉的投资成本,采用先进的工艺和技术,对一台自动高速冲压机进行大 修或改造,其性能和精度和一台新的自动高速冲压机一样,完全可以达到目前的最新技术水平。     

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.     

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.