非圆齿轮数控滚齿加工的参数自动编程系统

在分析非圆齿轮滚齿加工运动关系的基础上,介绍了一种具有齿轮加工特色的参数自动编程系统。设计了系统整体架构,通过友好人机交互界面输入齿轮参数、刀具参数和工艺参数,经系统验证自动生成滚齿NC程序。     

数控滚齿自动编程技术的研究

建立了圆柱齿轮滚齿自动编程数学模型,提出了数控滚齿自动编程方法.该方法仅需通过人机界面输入特定参数,在工艺数据库和运算库的支撑下,即可自动生成NC程序.针对西门子840D数控系统,进行了自动编程系统开发,实现了人机界面设计、系统算法设计和功能模块设计.在滚齿机上的应用表明编程效率高、加工零件精度高、算法可靠性强.     

数控滚齿自动编程技术的研究

建立了圆柱齿轮滚齿自动编程数学模型,提出了数控滚齿自动编程方法。该方法仅需通过人机界面输入特定参数,在工艺数据库和运算库的支撑下,即可自动生成NC程序。针对西门子840D数控系统,进行了自动编程系统开发,实现了人机界面设计、系统算法设计和功能模块设计。在滚齿机上的应用表明编程效率高、加工零件精度高、算法可靠性强。
     

基于粒子群算法的滚削齿面综合轮廓误差预测模型与试验研究

在配备有自主研发的数控滚齿系统的精密卧式滚齿机上,运用三因素两水平响应曲面法设计滚削试验,研究齿轮滚削加工刀具转速、轴向进给速度、背吃刀量对齿轮齿面轮廓误差的影响规律。根据试验结果,分析得出齿轮齿廓总偏差、齿轮螺旋线总偏差、齿距累计总偏差的预测模型及各工艺影响因素对齿面轮廓误差的作用显著程度,并以三个预测模型的附加权重值之和达到最小值为目标,建立可以评定多目标误差的齿面综合轮廓误差数学模型,运用粒子群优化算法对齿面综合轮廓误差数学模型进行分析优化,寻找最佳滚齿加工工艺参数。试验表明,采用粒子群优化算法对响应曲面法建立的齿面综合轮廓误差数学模型进行优化可以作为滚削加工前的工艺参数选取方案。     

SEC500数控系统在数控滚齿机中的应用

介绍了SEC500数控系统的电子齿轮箱功能在数控滚齿机上的应用,利用SEC500数控系统提供的参数化编程模板,编写参数化程序,实现了齿轮加工中对参数化编程的要求。     

数控滚齿加工自动编程技术的研究

为了提高齿轮加工的工作效率,提出了一种数控滚齿加工自动编程系统。首先,建立了数控滚齿-轴向滚切法的数学模型;然后,建立数控滚齿加工自动编程系统的硬件平台,对系统进行了功能模块划分和软件页面集设计;最后,对系统开发中的面向对象软件编程技术、通信技术、多线程技术、译码技术等做了分析。该技术为今后齿轮滚齿数控加工的便利提供了一些参考和经验。     

大模数、少齿数数控滚齿机的设计

介绍了一种填补市场空白的大模数、少齿数数控滚齿机的设计。该数控滚齿机床的结构选用模块化设计方法,采用大立柱移动、工作台固定的敞开式立式机床布局。在结构上对床身进行了加强和热平衡设计、对主轴系统进行了消隙设计并加大了装刀空间、对工作台进行提速设计。通过计算选择合适、足够的主轴电动机,使得机床能够完成大模数、少齿数齿轮的高速高效加工。该数控机床在通用性型数控系统的基础上二次开发了自动编程软件功能,通过友好的人机界面输入相应的齿轮参数、刀具参数、安装参数和工艺参数,软件能自动生成机床识别的加工代码,使滚齿编程效率得到极大提高。     

滚齿机数控系统零编程技术的研究

数控滚齿机摒弃了普通滚齿机的复杂的传动系统,机床的各个运动轴都采用数字控制,提高了齿轮加工的精度及加工的效率。在滚齿加工中根据加工齿轮和刀具的参数来确定刀具与工件之间特定的运动关系。在分析零编程技术可行性的研究基础上建立圆柱齿轮滚齿零编程数学模型,在以后基于IPC+PMAC的零编程软件开发中起到至关重要的作用。在开发的系统中,操作者无需编程,只需填入相关参数,系统软件将会自动生成齿轮加工的加工程序。     

基于AutoCAD的数控铣床图形编程中DXF文件的读取

文章阐述了基于AutoCAD的数控铣床图形编程系统设计中DXF文件的读取问题.数控铣床图形编程系统的设计是通过DXF文件,并加入加工工艺信息等,可以自动地生成ISO标准代码的数控加工程序.在此基础上,图形编程系统可以进行加工过程模拟、NC代码检验.文章重点介绍用于图形编程中的DXF文件如何读入与处理.     

基于壳体典型特征的数控加工快速编程研究

基于特征进行编程是实现数控加工高效、快速编程的基础,针对这一问题,对基于壳体典型特征的数控加工快速编程进行了研究。通过分析壳体零件典型制造特征,将数控加工工步信息、刀具、切削参数通过用户化模板进行定制开发,形成壳体典型特征应用库,供不同用户进行数控加工编程时共享。在应用中,可以实现加工工艺信息的自动给定,通过简单设置便可完成数控加工编程,进而大幅提高数控加工编程效率。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

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.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

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....     

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.