基于成组技术设计汽车转向器装配用随行夹具

为了解决汽车动力转向器装配时多品种、小批量的快速换型问题和实现装配线产能的最大化,通过利用成组技术对汽车动力转向器进行产品分组,设计出基于成组技术的装配用随行夹具,满足了汽车动力转向器装配时多品种、小批量的快速换型,最终实现了装配线产能最大化的目标.     

精益单元化生产在多品种小批量装配生产中的实践

多品种小批量制造企业的生产组织特点决定了实施精益单元化生产的难度。提出了构建团队-目标定义-单元设计-单元管控-自主运行(Team-Objective-Design-Management-Operation,TODMO)的精益单元实施路径,通过运用价值流分析图、产品-数量-工艺(Product-Quantity-Routing,P-Q-R)分析法划分产品族、工艺和操作标准化,以及建立线边物流等方法,建立了分工协作、动态平衡和自主运行的U型精益单元化生产线,消除了生产过程中的浪费,缩短了产品装配周期,提高了产能,且满足产品交付需求。对多品种小批量的装配生产线建设和优化具有一定的指导意义。     

应用成组工艺实现装配自动化

目前,多品种中小批量生产中普遍存在的问题是装配作业的自动化水平低、劳动量大。由于机械加工自动化劳动量减少,使得装配费用在产品制造总费用中的比重增加了。 多品种中小批量生产中,装配作业自动化的困难主要是需要经常调整设备。另外大多数产品结构的工艺性较差。因为,迄今这些产品在设计时只考虑了采用机械化工具,或者最多采用专用的装配设备进行手工装配的工艺性。因此,现今大量生产中所用设备的结构、布局和自动化装配过程的组织形式,对于中小批量生产产品大多是不适宜的。 采用工业机器人实现装配作业自动化是有广阔前景的。工业机…     

基于线平衡循环分析提升装载机装配效率

目前工程机械行业大型企业基本实现了装载机装配流水线生产,生产效率比地摊式生产要高很多,可以快速满足稳定的市场需求。当装载机市场需求量突然上升时,装载机装配流水线产能需要快速提升,以满足市场需求。由于装载机产品为多品种小批量生产模式,产能提升需要运用相关精益生产理念以及工具来实现。本文阐述了如何基于线平衡循环分析快速有效实现装载机装配效率提升。     

面向多品种小批量产品的柔性装配系统研究

针对制造企业多品种小批量产品生产对敏捷性的要求,提出了一种柔性装配系统的设计方法,该柔性装配系统能够根据装配现场实时信息动态调整任务并通过控制系统控制现场实施。结合某企业实际情况实现了柔性装配过程的动态管理;利用Plant Simulation对该柔性装配系统进行了仿真研究,验证了该方案的可行性和有效性,为多品种小批量产品柔性装配的研究提供了有价值的参考。     

火工品自动装配生产线中回模系统的设计

回模是火工品自动装配生产线的一个重要工序,文中基于火工品自动装配生产线的工况及生产要求,通过UG三维建模,完成了回模机构的整体结构设计和控制原理方案的选择,设计了一套适合火工品自动装配生产线的全新的回模系统.     

基于任务请求的简单柔性装配系统设计和实现

针对小批量、多品种产品的装配特点,使用紊流输送技术,提出并实现了一种基于任务请求的简单柔性装配系统的设计方法.该简单柔性装配系统由柔性装配线、控制系统、监控和调度系统3部分组成,为小批量、多品种产品装配线的建设提供了一个柔性化的解决方案.     

无刷伺服电动机生产线建设

为满足航天产品中的机电伺服机构对无刷伺服电动机的产量需求,通过数字化、信息化等先进技术整合现有装配、测试资源,调整现有生产布局和组织方式,达到生产过程的数字化。最终建成具有多品种、小批量特征的,集装调测试、仓储为一体的数字化生产线,大幅提高无刷伺服电动机的生产能力。     

汽轮机叶片数字化柔性生产线设计应用

以汽轮机叶片为产品对象,进行数字化柔性生产线建设,通过工艺流程设计、生产线布局规划、加工单元主要设备导入、信息化系统设计与集成应用,实现汽轮机叶片的自动化柔性生产,提高产品质量和生产效率,降低运营成本,满足多品种、小批量的订单模式需求。     

集成制造在生产车间的应用

"四轮一带"车间建设中,针对行动系统产品批量小、品种多、体积各异的特点,应用成组技术对产品进行分类,将分散的小批量汇集为较大的成组生产量,之后依据分类构建不同类型的柔性机械加工生产线及柔性装配生产线,提升了设备的负荷率、工艺规程编制效率,同时降低了投资成本;将信息采集技术、PLC控制技术与生产管理系统、质量管理系统进行系统集成,应用于柔性机械加工及柔性装配生产线中,对生产订单、生产计划及生产过程的产品信息、设备信息、物料信息、质量信息、作业进程等实施监测、控制、管理和决策,提高了产品质量,提升了企业的管理能力及制造水平。实践表明,集成制造是一种高效、可行的生产技术,是现代工业生产重要的解决方案,具有广泛的应用前景。     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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。     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.