面向零部件加工的利器Delcam PartMaker

Delcam PartMaker是专业的多轴瑞士型纵切机床及多轴、多任务车铣复合加工CAM系统,包括瑞士型纵切机床编程专用模块Part Maker SwissCAM和多轴、多任务车铣复合中心编程专用模块PartMaker Turn／Mill等。广泛支持Citizen、Star、Tomos等众多品牌的瑞士型纵切机床和近15年来几乎所有类型的车铣复合加工中心。     

基于PartMaker的车铣复合加工技术

车铣复合加工在现代数控加工技术中,发挥着日益重要的作用。针对典型结构件,研究了基于PartMaker的车铣复合加工技术。以典型的轴类零件为例,首先,选择加工机床,进行工艺设计;然后,利用PartMaker软件,编制数控程序并进行后置处理,生成机床加工程序,利用VERICUT软件构建了加工仿真模型,并对机床程序进行了仿真加工;最后,通过实际加工得到了合格的零件,验证了加工方法的可行性。     

Mastercam在车铣复合加工中的应用

随着数控机床的广泛应用,CAD/CAM软件成为提高数控编程效率,解决特殊和复杂工件数控编程的重要工具.在对加工实例进行工艺分析的基础上,提出了利用Mastercam软件进行车铣复合加工自动编程的思路,阐述了该软件的车铣复合功能,详细介绍了其工作流程和实现方法.     

FeatureCAM特征编程在车铣加工中心的应用

<正>1软件选用车铣复合类机床由于综合铣、车、钻、镗、切断、传递、同步等加工技术于一体,能多任务多方式完成切削工作。Feature CAM具有专用的车铣复合模块,能简单高效地响应车铣加工中心的各种编程操作,其自动特征识别技术(AFR)和交互式特征识别技术(IFR)在行业内处理领先地位,可极大地缩短加工编程时间,使加工管理更加有效。因此,为实现高效的复合加工,在单一平台实现从工艺、编程、仿     

成组工艺技术在轴类零件数控车削加工中的应用

在数控加工中,对每一个零件进行编程,然后输入调试,会降低数控加工的效益.轴类零件具有相似的结构特征,按照成组工艺技术,对零件进行特征分析,构建复合零件,编制复合加工工艺,再按照复合工艺编制适合于复合零件的数控加工程序,存储于PC机,设计一个软件系统,在加工不同零件时,只要输入零件特征,系统会根据存储于PC机的复合加工程序,自动生成适合于加工该零件的程序,大大减轻编程工作量,可有效地提高生产率.开发的编程方法,经过实际应用,减少了编程、输入调试的时间,提高了工作效率,缩短生产周期,最大限度地发挥数控加工这一先进制造技术的优势,并可降低对操作员的技能要求,保证产品质量,减少培训投资.     

GibbsCAM在多任务机床中的应用

随着产品设计结构的复杂化,产品质量要求的精密化,交付进度的及时化,要求数控技术也要朝着高速度、高精度、复合化、网络化等方向发展。机械加工领域的发展趋势就是让那些复杂的零件加工更加高效,这也促使多任务机床的应用越来越广泛。本文通过描述数控加工现状及GibbsCAM软件的特点,结合GibbsCAM在多任务机床编程中的技巧,论述了GibbsCAM软件在提高多任务机床加工效率、挖掘数控机床潜能方面的作用。     

变量编程在弧形螺纹加工中的应用

主要介绍了变量编程在弧形螺纹加工上的应用,其中对变量编程与一般编程进行了比较,在介绍变量编程时,主要给出了精加工圆柱弧形螺纹与加工复合弧形螺纹的编程方法.     

车床封闭循环指令在凹形轴类零件加工中的应用分析

数控车床复合循环指令提高了编程的效率.但对一些复杂零件而言,使用复合循环指令也存在适应性差、效率低的缺点.对复合循环指令的应用条件进行了分析,对特殊形状的凹型轴类零件的数控加工工艺进行了探索,介绍了此类零件的数控加工方法及注意事项.     

GibbsCAM为高度复杂的多通道机床提供仿真

以色列Cimatron集团的子公司美田Gibbs公司是针对CNC机床高效编程的GibbsCAM软件开发者,近只其宦布在美国芝加哥国际机床制造技术展览会（IMTS2010）上展出GibbsCAM多任务车铣复合加工（MTM）即将推出的功能。     

四类复合循环指令在车削加工中的应用探讨

1)研究的目的:数控车床加工复合指令代码在加工的应用及编程技巧。2)研究的方法:编程及数控车床加工。3)研究的结果:提高编程技巧与加工手段     

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.