基于Pro／E的模具CAD／CAM

Pro/E是功能强大的三维CAD/CAM软件,应用十分广泛,在模具设计与制造行业占有显而易见的优势.本文介绍基于Pro/E的模具CAD/CAM技术.以一爪盘的模具设计与制造为例,应用Pro/E软件的Pro/MOLDESIGN和Pro/MANUFACTURING模块进行模具设计与数控加工,阐述了Pro/E模具设计与数控加工的过程和方法.实践证明应用Pro/E软件进行模具设计与制造具有独特的优越性.     

基于Pro／E软件的马克杯造型及模具设计

以马克杯为例,介绍了运用Pro/E软件进行产品造型及模具设计的过程.详细论述了该产品的三维造型设计方法,重点介绍了模具设计流程及分型面、模具型腔和型芯的设计.阐述了利用Pro/E进行塑料模具设计的高效率特性.     

Pro/E参数化设计在鼠标上壳注塑模设计中的应用

介绍了基于Pro/E的IBM鼠标上壳注射模的设计过程.利用Pro/E软件的参数化功能和全关联数据库进行三维造型和模具的设计,提高了模具设计的水平和效率,缩短了模具开发周期,降低了制造成本.     

基于三维造型的收音机上盖注塑模具CAD/CAM

三维造型软件(以Pro/E为例)由于其采用了参数化造型和单一数据库技术,因此为注塑模具的集成制造提供了良好的概念设计、基础设计、详细设计平台.依据Pro/E软件的功能特点,以收音机上盖注塑模具为例,归纳总结了基于三维造型的注塑模具设计加工制造流程.     

基于Pro/E的模具数控铣削加工

介绍了Pro/E的模具CAM技术,研究了模具数控铣削加工的基本流程,应用Pro/E的NC模块对实例“晾衣叉”的模具型腔进行数控铣削加工,通过加工的过程和方法,验证了应用Pro/E软件进行模具设计与制造的优越性.     

基于Pro/E的香皂盒底盖的模具设计

以香皂盒底盖为例,介绍了运用Pro/E软件进行产品造型及模具设计的过程,详细论述了该产品的三维造型设计方法,重点论述了模具设计流程以及分型面、模具型腔和型芯的设计.     

基于Pro/E和MasterCAM的油壶模具设计与数控加工

为提高模具设计及其数控加工的质量和效率,提出首先利用Pro/E软件进行油壶零件造型及模具设计,然后将图形转换到MasterCAM软件中进行数控加工的方法,并详细分析了油壶后模的加工工艺及加工参数的设置.     

基于Pro/E的计算机硬盘托架的冲压模具设计

简要介绍在Pro/E软件平台下进行计算机硬盘托架的冲压模具设计的技术路线.根据计算机硬盘托架的结构特点,提出冲压模具设计工艺;通过应用Pro/E的装配设计技术,大大提高了复合模和弯曲模的设计效率和设计的精确度.设计结果数据为模具的数控加工制造提供了基础.     

Pro/E与反求工程在塑料模具设计中的应用

反求工程作为当今产品设计制造的一种新手段,在众多领域都具有广泛的应用前景,Pro/E中强大的造型功能、模具设计功能及逆向工具为反求工程对塑料模具的设计制造带来巨大的影响,此文通过实例对这一关键技术进行分析.     

Pro/E在汽车轮毂模具设计中的应用

CAD和CAM的广泛应用已成为模具企业普遍应用的技术。通过Pro/E三维造型功能中的零件模块对汽车轮毂进行了三维实体造型,利用Pro/E的模具模块对汽车轮毂造型进行了模具设计,生成相关的机构及部件,并实现了模拟开模过程。从而保证了零件设计和模具设计的质量,确保了设计和工艺的合理性,有利于缩短设计周期,提高了产品和模具的准确率和生产效率。     

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.