箱体零件CAD/CAM技术应用研究

SolidCAM软件能无缝集成于SolidWorks软件,使加工零件在三维实体造型的基础上,利用SolidWorks的原有界面,进入到数控加工状态,在计算机上模拟出数控加工全过程。由于零件进入CAM后仍保留了CAD操作界面上零件的所有特征。从而避免了数据文件格式的转换,保证了数据一致性、安全性和保密性。本文以容积式压缩机机身为例子,介绍了机身数控加工中重点尺寸、定位方法、加工工序、刀具安排和切削用量选择,以及如何将这些工艺参数通过设置进入SolidCAM进行数控加工仿真。     

SolidCAM实现模具刻字加工模拟及数控程序快速生成

SolidWorks提供了无与伦比的、基于特征的实体建模功能。运用SolidWorks软件可以快速建模,并在模具表面生成所需的文字,再利用SolidCAM工具实现加工模拟及数控程序的快速生成。下面通过一实例使大家了解利用SolidCAM工具实现模具表面刻字加工模拟及数控程序快速生成的过程。     

阀芯零件车铣复合数控加工仿真

文章以液压设备中电磁阀阀芯的车铣复合数控加工为例子,介绍了复杂零件如何利用CAD／CAM集成软件在数控加工前进行仿真,从而自动生成数控代码的全过程。重点讲述了加工零件在i维实体造型时对数控加工部分重点尺寸的精度控制、加工工序、刀具安排和切削用量选择,以及如何将这些工艺参数输入SolidCAM管理器,以进行数控加工仿真。     

基于EdgeCAM的汽车模具数控加工技术

以EdgeCAM软件及其在汽车模具中的应用为背景，阐明了CAM数控加工的基本步骤与思路，重点叙述了运用EdgeCAM软件实现数控加工的关键技术和难点，探讨和研究了EdgeCAM在汽车模具数控加工中的应用，为数控工艺编程提供参考数据，具有较好的推广价值。     

UG软件在数控加工中的分析研究

在机械制造领域,数控加工技术具有广阔的发展前景。应用数控加工技术时,加工参数和加工方案都会影响加工的效率。因此,为了保障数控加工的效率,应该在数控加工中积极应用UG软件。本文简要介绍UG软件和数控加工的编程原理,并对UG软件在数控加工中的应用进行简要分析。     

基于VERICUT的零件虚拟仿真加工研究

在将UG软件的CAM功能与VERICUT的仿真优化功能相结合的基础上,首先建立了配备FANUC系统的虚拟三轴数控加工中心及其刀具库;其次应用UG软件建立了支座零件、虎钳工装的参数模型,并生成了刀具加工路径及数控程序;然后应用VERICUT软件真实模拟零件的加工状态,并对零件的刀具路径及加工参数进行优化;最后通过零件实际加工情况与仿真结果的比较,验证了数控仿真加工可以有效提高零件加工效率,且数控程序经优化后零件可获得更好的表面光洁度和尺寸精度。     

MasterCAM数控编程实例

以MasterCAM软件及应用实例(手表外壳加工)为背景,说明CAM软件数控编程的基本步骤、思路,重点介绍其加工工艺和加工参数等关键问题,为数控编程提供参考。     

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UG的数控多轴加工工艺优化设计分析

探究UG软件下数控多轴加工工艺的优化措施。以数控多轴机床加工技术为切入点,以叶轮加工为例,分析UG软件在数控多轴加工中的应用,并以此为研究基础,结合数控多轴加工工艺的原理与特性,提出工艺优化措施,以期为相关工作者提供参考。     

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.     

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....     

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。     

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.