发展我国机床业高端制造

国家已宣布"十二五"期间制造业转型升级要从低端走向高端,机床工业是为国家装备制造业提供加工装备的基础工业.因此十分明确,机床工业在"十二五"的主要任务在于为满足装备制造业的需要,尽最大可能发展高端制造装备. 我国机床制造业近十年来在为机械制造业提供高端制造装备方面取得了一些进步,体现在市场满足率方面有了一定的提高,但应当注意的是.整个加工装备的市场满足率虽然已超过60%,但在高端制造业装备方面,仍然对的存在着很大地依赖性.     

数控机床产业发展专项规划即将实施

机床是装备制造业的基本生产手段，机床工业是一个国家的基础性、战略性产业之一。而其中作为机电一体化装备的数控机床，集高效、柔性、精密、复合、集成诸多优点于一身，已经成为当化装备制造业的主力加工设备和机床市场的主流产品。     

轴套加工工艺及精度分析

随着国民经济不断的发展,市场对装备制造业的要求也不断提高.磨床作为精密加工的工作母机,对其的工作精度要求也越来越高.在机床制造业中,主轴系统是必不可少的一个组件,主轴系统的精度如何决定了机床的工作精度.     

中国机床行业作为基础产业整体形势分析

装备制造业是每个工业化国家的主导产业。在工业化历史进程中，机床产业作为装备制造业的基础产业，它的战略地位尤为突出。当代数控机床的发展不仅为装备制造业提供了强力支撑，同时代表着一个国家现代工业化的水平。国务院总理温家宝在辽宁视察时指出，机床是装备制造业的工作母机，实现装备制造业的现代化，取决于我国的机床发展水平。振兴装备制造业，首先要振兴机床工业，我们要大力发展国产数控机床。     

ASTPO2007力促全球机械商家再聚首 第9届(东博)上海国际机床展

2007年是中国第十一个五年规划第二年,国务院《关于加快振兴装备制造业的若干意见》的文件精神已经得到贯彻,在市场中发挥了积极作用。作为装备制造业重中之重的机床工具业市场的兴盛业已非常切实地诠释了这一点。国家在航空航天、船舶、铁路、重型冶金     

高精度特大型机床主轴轴承研制探索

装备制造业是为国民经济发展和国防建设提供技术装备的基础性产业,大力振兴装备制造业,是党的十六大提出的一项重要任务,是树立和落实科学发展观,走新型工业化道路,实现国民经济可持续发展的战略举措。在装备制造业中,发展大型、精密、高速数控装备和数控系统及功能部件,改变大型、高精度数控装备大部分依赖进口的现状,满足机械、航空航天等工业发展的需要,是其中一项重要目标。机床作为装备制造业的基础,其制造技术水平的高低决定了一个国家装备制造业的技术水平,而机床主轴轴承精度是影响机床主轴精度的关键。     

温家宝总理关于振兴机床工业大力发展国产数控机床的指示

机床是装备制造业的工作母机,实现装备制造业的现代化,取决于我国的机床发展水平。振兴装备制造业,首先要振兴机床工业,我们要大力发展国产数控机床。温家宝2004年11月13日Machinetoolsareessentialfortheequipmentmanufacturingindustryandmodernizationoftheequipmentmanufac     

产品信息化比生产过程的信息化更重要——访机械科学研究院屈贤明教授

装备制造业是制造业的基础和核心．也是工业化进程中带动作用和影响力最大的产业。机床又称为“工作母机”,是制造装备的装备．所有的机器和设备都是使用机床生产的。     

大力推进高档机床国产化,促进装备制造业振兴

国家提出要加快振兴装备制造业。并具体提出了要实现重点突破的16个关键领域。这其中就包括高档数控机床。机床作为装备制造业的工作母机，要振兴装备制造业。机床行业必须先行，但实际情况是，机床行业并没有做到先行。因此对于机床行业来说，实现高档数控机床国产化，促进装备制造业的振兴，是一个非常重要的课题。     

滚动功能部件用户调查分析报告

一、调查背景和目的 2004年11月,温家宝总理在东北老工业基地企业座谈会上曾经指出:机床是装备制造业的工作母机,实现装备制造业现代化,取决于我国机床发展水平。振兴装备制造业,首先要振兴机床工业,我们要大力发展国产数控机床。数控机床的重要性可见一斑。为此,在国务院新近通过的《关于加快振兴装备制造业的若干意见》中,把数控     

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.