微型电机轴的绿色加工方法

介绍了一种微型电机轴的绿色加工方法,它突破了微型电机轴传统的加工方法,改车削两端半球面为冷镦,变外圆磨削为冷拉.由于是无切屑加工,节省了材料;由于取消了热处理,节省了能源;由于省去了磨削工序,节约了成本,减轻了对环境的污染,因而实现了微型电机轴的绿色加工.     

液压系统的改造设计研究

对冷床上卸钢系统和四辊轧机开卷机液压系统存在的问题进行了分析,找出了产生问题的原因,并对原液压系统进行了改造,经改造后的系统,减少了油液的泄漏,提高了系统的稳定性,减小了维修强度,降低了维修成本,提高了系统的工作效率.     

基于协同应用平台的汽车售后服务系统研究

阐述了国内外汽车制造企业售后服务信息化发展现状,分析了汽车售后服务业务流程,研究了ASP模式的协同应用平台,并根据汽车售后服务的业务特点构建了基于协同应用平台的售后服务系统体系结构。最后,设计了系统的模块,描述了其基本功能,并对系统进行了开发。     

基于SolidWorks平台的糕点切片机设计

利用SolidWorks软件,根据糕点切片机的设计要求进行了三维建模,进行了设计零件的装配,验证了设计方案的正确性,模型使用棘轮机构实现了切片厚度可调的功能。使用该软件进行三维建模,节省了设计工作时间,节约了设计经费,做到了一次设计成功。     

运载火箭贮箱壁板机铣装夹技术研究

为进一步提供运载能力,对新一代运载火箭提出了减重要求,其贮箱壁板加工工艺方法由机械铣切替代化学铣切。围绕某型号运载火箭的研制需求开展了贮箱壁板机铣装夹技术研究。通过对壁板的结构特点及加工工艺性分析,确定了"先弯后铣"的工艺方法。通过开展工艺试验,定位了引起产品超差的主要因素,分析了超差原因,制定了解决措施,引出了真空吸附装夹技术研究的需求,阐述了真空吸附装置的设计方案。结合真空吸附原理,进行了机铣过程切削力理论计算,确定了真空吸附系统的吸附力、吸附面积,优化了密封结构设计,实现了柔性装夹。最终通过合格产品的试制,验证了真空吸附装夹装置的有效性。     

双足型直线超声电机的原理分析及结构设计

研制了一种新型直线超声电机,首先对其驱动机理进行了探讨,对定子表面质点椭圆运动的形成进行了分析,结合电机输入电压信号的时序阐明了电机工作模态的激发过程;其次对电机结构进行了设计,确定了振子尺寸,组装了一台直线超声电机.     

控制焊接飞溅物 提高液压油箱清洁度

阐述了液压油箱的结构和制造工艺。通过改进结构,方便了焊接操作;通过细化工艺,确定了焊接规范,从而控制了飞溅,减少了油箱内的清理量,提高了清洁度。     

谈以信息化带动工业化的认识与措施

根据对信息化的分析,论述了信息化带动工业化的必然性,分析了信息技术是生产力的标志,讨论了国内外信息化形势,进而提出了对信息化的客观认识和应采取的措施,强调了领导干部对信息化的态度,提出了人才培养的方式.     

长撑杆抓斗静力学性能分析及参数优化

针对港口上常用的长撑杆散货抓斗,分析影响抓取性能的参数,根据抓斗结构建立了无量纲空间尺寸模型,进行了静力学分析,提出以最小抓取力矩为静力学计价指标,并绘制了性能图谱。根据性能图谱建立了多变量非线性优化模型,应用matlab遗传算法工具箱进行了求解,对抓斗的几何参数进行了优化设计,修正了传统依靠经验设计的抓斗参数,提高了抓斗的抓取力矩,从而提高了抓斗的抓取性能和效率,结合实例对模型的有效性进行了验证分析。     

基于有限元分析方法的高速电主轴热态特性研究

介绍了高速电主轴的特点,分析了高速电主轴单元的热变形机理与散热机制。建立了某型高速电主轴热态特性有限元分析模型,利用ANSYS进行了稳态／瞬态温度场及热-结构耦合场分析,并利用分布加载瞬态热分析模拟了机床一天中的实际工作情况,得到了电主轴的温度场变化情况,为有效控制电主轴的温升提供了理论依据。在分析结果的基础上,提出了改善电主轴热态特性的措施,为电主轴冷却结构设计提供了参考。     

A Study on Development of a Die Design System for Diecasting

Diecasting is one of the forming methods for manufacturing a large number of products with short lead time and a good surface by high injection pressure of cast alloy. Die design is composed of selection of cast alloy, design of product, runner and gate design, etc. In reality, however, die design for diecasting has been performed by a trial and error method, which causes economic and time loss. This paper describes the development of the computer-aided design of product and die design. The CAD system has been written in AutoLISP on the AutoCAD with a personal computer. In this study, the die design system for the die casting process has been developed and a flowchart is presented for the automation of die design, especially of the runner–gate system. As the generation process and die design system using 3D geometry handling are integrated with the technology of process planning, die design can be automated. In addition, specific rules and equations for the runner–gate system have been presented to avoid too much trial and error with expensive equipment. It is thus possible for engineers to make automatic and efficient die design for diecasting which will result in a reduction of the required cost and time. An example of a cap-shaped product, i.e. a motor pulley, is given using the proposed flowchart.     

A rough set approach to design concept analysis in a design chain

The inherent dynamic relationships among design tasks performed concurrently at different organizations characterize the complexities of a design chain where designers with diverse expertise need to collaborate across organizational boundaries. To ensure timely completion of inter-related design tasks, metrics to facilitate the early evaluation of design concepts are crucial. The ability to evaluate and select suitable design concepts at an early stage will ensure better solutions and greater savings in time and effort further downstream. This paper proposes a new approach based on the rough set theory to design concept analysis. The approach aims at early detection of design inadequacy. A so-called information system is constructed using the information gleaned from design concepts and design capabilities, and analyzed using the rough set theory to derive a set of design rules for design concept analysis. The approach embodies a technique for handling attributes with unavailable information, which is a frequent occurrence in design. This paper presents details of the proposed approach, the novel technique, and a case study.     

Knowledge-based configuration design of a train bogie

The configuration design of a mechanical product can be performed efficiently when it is based on a functional model. There are some function-based design methodologies that decompose functions from the abstract level to the concrete level by matching the functions to physical parts. However, executing innovative design is difficult when the function is matched only to pre-defined parts. This paper describes the configuration design process of a train bogie with a design expert system that uses function taxonomy and TRIZ. The design expert system can propose a functional model of a new part that is not on the existing parts list of train bogies. Levels of design knowledge which describe the operations of the mechanical product at different levels of abstraction are introduced. This is the theoretical basis for using TRIZ with the function taxonomy for configuration design. The design expert system is adequate for controlling the design knowledge, which is expressed as knowledge of parts, functional modeling, mapping rules between functions and parts, and TRIZ. The functional model of a new brake system in the bogie is introduced with the design expert system.     

复摆鄂式破碎机CAD系统的研究与开发

重点介绍了复摆鄂式破碎机CAD系统的组成及研发方法。该系统由设计计算、绘图、数据库三部分组成。系统屏幕菜单的设计采用AutoCAD二次开发技术,绘图程序的编写主要用到Visualisp语言和DCL对话框的设计。数据库是整个设计的枢纽。通过论述构建了清晰可行的复摆鄂式破碎机CAD设计平台,为进一步的商品开发打下了良好基础。     

结合有限元法的空间相机优化设计

优化设计是改进设计的有效方法,有限元法是解决分析问题的有力工具.简要阐述了空间光学仪器结合有限元法的优化设计方法,并以某空间相机为例详细介绍了系统的结构优化过程,验证了其优化后的性能.     

基于遗传算法的交互式齿轮优化设计方法研究

常规的齿轮设计方法通常需要花费大量时间，通过数次试算才能得到一个较好的设计结果，采用一般的非线性和线性优化方法注解起来也比较困难。为此，本文以渐开线标准直齿圆柱齿轮为例，提出了一种基于遗传算法的交互式优化设计方法，对于设计原始数据，设计要求及设计过程中的经验型中间结果采用交互式输入，而对其他主要设计变量采用遗传算法进行优化。     

大型水轮机方案设计知识重用可拓策略

为继承与重用大型水轮机产品设计知识,通过基元对设计知识进行了描述,研究了产品方案设计知识重用可拓策略,运用基元的可拓性实现了设计知识的拓展,形成了产晶方案设计知识的可拓基元集合,并建立了相应的产品方案设计知识重用可拓模型.最后,以大型水轮机选型方案设计为例,验证了该模型的有效性和可操作性.     

Computer-aided feature-based design for net shape manufacturing

Contemporary computer-based design tools are not suitable for concurrent engineering oriented product design due to (a) their particular and stand-alone functionality, (b) the lack of a capability to support interactive decision-making, and (c) the heavy involvement of designer expertise and experience. This paper presents a feature-based design for a manufacturing framework which is able to support the practice of concurrent engineering by providing functions designed specifically for net shape product design and on-line design guidance. Knowledge-based and object-oriented modeling technologies are employed to develop design evaluation facilities. An object-oriented product model, embedded with product design and process knowledge, is constructed and used for design evaluation. Geometric reasoning is performed on features, feature interactions, and overall shape to identify areas that may conflict with design principles. This paper concentrates on design for net shape manufacturing with an emphasis on die casting and injection molding processes. However, the proposed framework is general enough for other net shape processes by customizing process specific features and encoding process design rules.     

Development of Expert System for Concurrent Product Design and Planning for Assembly

This paper addresses the development of an expert system for concurrent product design and assembly planning (CDAPFAES) including conceptual design, detailed design, assemblability analysis and design for assembly, assembly system design, assembly process planning and stimulation, and technical–economics justification. This approach is implemented through an agent-based framework with concurrent integration of multiple cooperative knowledge sources and software. This intelligent system can offer systematic assistance for assembly design and planning in the early stage of product development and facilitate, as far as possible, the use of flexible assembly equipment, including robots. Finally, this new design methodology is illustrated with a successful implementation of a switch product design.     

工程迭代设计中产品族开发过程的研究与建模

为了在工程迭代设计中减少新产品开发的提前期,提出了一种基于设计结构矩阵的产品族开发过程模型.在该模型中,基于设计参数间的依赖关系建立设计结构矩阵,并运用路径搜索算法将其整理为包含耦合子矩阵的解耦矩阵.对于其中的耦合子矩阵,运用基于马尔可夫链的串行迭代模型计算设计总时间,并运用基因算法优化排序.运用迭代设计的并行模型识别出对耦合关系贡献大的设计模态和设计参数,根据设计模态模块化设计参数,而对耦合关系贡献小的设计参数进行标准化.最后,将设计参数层的标准化和模块化映射到零件层,建立相应的产品族结构,以汽车离合器的设计为例阐述了该过程模型的有效性和应用前景.