微量油膜附水滴切削液的研究

使用冷风、微量可自然降解油剂(植物油或脂油)和少量水，经喷雾形成的微量油膜附水滴切削液替代传统切削液，并在加工中心机床上与切削液分别采用微量油、微量水及乳化液的切削加工进行对比试验。试验结果表明，微量油膜附水滴切削液能使切削力减少30％左右，且具有良好的润滑和冷却效果，适用于切削加工。     

微量油膜附水滴切削性能的试验研究

通过对微量油膜附水滴切削液切削、干切削和乳化液切削进行对比试验,研究了微量油膜附水滴的切削性能。结果表明:微量油膜附水滴切削液能够显著提高切削性能;与干切削和乳化液润滑切削相比,采用微量油膜附水滴切削液能够降低切削力和加工表面的粗糙度值,延长刀具的使用寿命。     

1Cr18Ni9Ti不锈钢车削加工中油膜附水滴冷却润滑技术研究

通过对干切削、乳化液润滑、低温冷风切削和油膜附水滴润滑四种切削加工方式的对比试验,对油膜附水滴润滑的切削加工性能进行了研究。结果表明:与其他三种加工方式相比,采用油膜附水滴润滑时主切削力明显减小,加工工件表面质量明显提高,刀具磨损明显减小,证明了油膜附水滴润滑可以取得良好的冷却润滑效果。     

微量油膜附水滴不同喷射方向切削效果试验研究

利用油膜附水滴(OoW)切削液进行切削试验研究,并采用不同喷射角度进行喷射冷却润滑.试验结果表明,同干切削、乳化液冷却润滑加工相比,微量油膜附水滴能够降低切削力的产生,对后刀面和刀具侧面进行喷射切削效果更好;微量油膜附水滴切削液能够显著降低加工表面的粗糙度.     

微量油膜附水滴磨削液的研究

使用冷风、微量可自然降解油剂(植物油或酯油)和少量水，经复合喷雾形成的微量油膜附水滴磨削液替代传统磨削液，在数控平面磨床上与磨削液分别为微量水、微量油及乳化液、可溶液的磨削加工进行了对比试验。试验结果表明，微量油膜附水滴磨削液可以达到乳化液和可溶液同等及以上的磨削性能，具有良好的润滑和冷却效果，适用于磨削加工。     

车削45钢时微量油膜水滴切削液对切削性能的影响试验研究

简述了微量油膜水滴切削液的冷却润滑原理。在C621-1普通机床上采用干切削、乳化液和微量油膜水滴切削液3种不同的冷却润滑方式下对45碳素结构钢进行车削试验。试验结果表明,与干切削和乳化液切削相比,采用微量油膜水滴能显著提高切削性能,有效地降低了刀具磨损和加工表面粗糙度值。     

微量油膜附水滴的机械加工性能研究

通过油膜附水滴(OoW)切削液与干切削及乳化液润滑切削的对比试验,对OoW切削液的机械加工性能进行了研究.结果表明,OoW切削液具有良好的冷却润滑效果.采用OoW切削液的实验中,主切削力明显减小,切屑无烧伤现象,加工工件表面质量有明显提高.     

基于OoW技术的滚齿微量润滑设备研发与应用

油膜附水滴（OilsonWater,OoW）作为典型的增效微量润滑（Minimal Quantity Lubrication,MQL）技术，具有和大量浇注冷却油近乎相同的冷却性以及优异的润滑性能。基于OoW技术机制，开发功能先进的MQL产品，用于滚齿生产，并在实践中优化了加工参数。产品应用结果表明，滚齿MQL具有降低加工油烟、提高刀具寿命、扩大干切机床加工模数范围及降低二氧化碳排放等优异性能。该项技术的研发对传统齿轮行业升级改造、新型准干式切削机床开发以及建设绿色工厂具有重要意义。     

雾状油膜水滴切削液对车削力的影响分析

油膜水滴是使用冷空气、微量可自然降解油剂和少量水经复合喷雾法形成的可自然分解的新型绿色切削液。通过车削试验,比较和分析了不同冷却润滑加工方法下的切削力,揭示出雾状油膜水滴绿色切削液的优越性。     

微量油膜附水滴切削液加工对切削力影响的试验研究

为探索研究微量油膜附水滴(OoW)切削液在车削中对切削力的影响,选出较适宜的切削用量,通过正交试验方案,分别研究在干切削和OoW切削两种不同加工方式下,切削速度、进给量和背吃刀量等切削参数对车削45#碳素结构钢时主切削力的影响。经多元线性回归处理,建立切削力经验公式。结果表明:在使用OoW切削液润滑的情况下,主切削力变化范围较大,但采用较高切削速度、较低进给量、较大的背吃刀量时,主切削力较干切削时有明显下降。     

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.