齿形无声链链板孔设计加工

介绍了齿形无声链链板孔有关的设计,对链板孔进行了工艺分析,根据齿形无声链设计的链板孔设计了在普通压力机上进行冲孔、推孔的模具,并对模具结构和模具零件加工进行了介绍。     

冲压弯曲复合级进模具的设计与仿真分析

以减轻铰链制造中冲压和弯曲复合模具的载荷,提高模具寿命为目标,将传统铰链弯曲模具和冲压模具结合并采用斜楔滑块结构,解决了在冲压模具中进行弯曲的问题,开发了一套新的冲压弯曲复合级进模具。通过对其进行三维动态仿真,完成了干涉性检查,优化了模具的整体结构,又利用ANSYS Workbench软件对模具进行分析,并取得了合理的结果,该设计方法使这套模具的设计更加科学性和准确性。为其他模具的设计与分析提供参考。     

一种电饭煲把手注塑模具的设计

主要介绍了一种电饭煲把手注塑模具的设计。首先对塑件制品进行分析,确定了注塑机的型号,进而对模具的结构进行设计,包括模具的浇注系统、侧向分型与抽芯机构、型芯型腔以及脱模机构的设计等。实践证明:模具结构合理,工作性能良好,产出的塑件能够达到要求。     

基于制备铁基粉末冶金异形定位块的模具设计

本文根据铁基粉末冶金成型工艺特点和客户对产品性能要求,通过分析异形定位块的制备工艺、零件结构、模具结构与尺寸、模具强度与刚度、压制方式等方面对成型模具进行了优化设计。利用NX软件对模具工作过程进行了仿真,验证了设计合理性,为后期模具制造和应用提供技术支持。     

注塑模具的标准化与自动化设计

对注塑模具的标准化与其自动化设计进行分析,结合当下包装行业发展现状,从注塑模具标准化、标准化设计、自动化设计等方面对塑料包装制品的生产工具——注塑模具的标准化与自动化设计进行了深入的分析研究,以期更好地推动注塑模具设计能够始终跟上时代步伐,顺应社会发展。     

地垫注塑模具设计

从零件图的结构要素、注塑零件尺寸精度与形状位置精度等方面对地垫零件进行了注塑工艺性分析.对地垫塑料零件的注塑模具结构进行工艺性设计.本着在满足地垫注塑要求的情况下,模具结构尽量简单,以缩短模具制造周期,便于以后维修保养的原则,设计中将模具的基本结构确定为两板式单腔模具.并对地垫注塑模具的分型面、合模导向装置、主要工作零件结构、零件脱模推出装置、浇注系统进行了分项单元设计,并设计绘制了地垫注塑模具的总体结构图.     

汽车内饰转向护板注塑模设计【摘要】

本文基于CAD／CAE技术对汽车内饰件转向护板注塑模具进行了设计。运用Pro／E软件对模具进行了三维设计,使用MoIdflow对模具进行了CAE分析,优化了浇口位置,合理设计了排气槽,提高了设计效率,创新了塑料模具设计方式。根据产品结构,采用动模中心凸起布局,应用斜顶机构实现侧抽芯,简化了模具结构,提高了模具设计质量,降低了制造成本。     

MoldflOW有限元软件在肥皂盒模具设计中的应用

以肥皂盒模具为例子,对有限元理论进行推导,分析了模具工艺,重点讨论了填充时间、熔接痕等对塑件的影响,最后通过综合的分析得出最佳的模具方案,并设计了改模具,有一定的借鉴价值。     

导光板模具冷却水路的设计与分析

模具温度直接影响注塑件的成型质量与成型成本。分析了冷却水路的设计原理和设计要点,结合应用CAE分析软件Moldflow对制件的冷却过程进行模拟分析,提高模具冷却水路设计的合理性与设计效率,缩短模具的设计周期,缩短注塑件的成型周期。     

项目驱动教学法在高职模具专业的应用与研究

分析了传统教育对培养高职模具专业毕业生就业存在的问题,结合模具专业人才培养方案,对模具专业课程实施项目驱动教学法进行了探索和尝试,着重探讨了模具专业实施项目驱动教学法的设计原则、项目实施及应用等进行研究。     

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.