民用飞机装配生产线工装产能评估研究

对民用飞机装配生产线工装的总体情况进行了介绍,并对工装产能的评估进行了研究.在研究中,建立民用飞机装配生产线工装产能评估数学模型,对现有工装产能及扩充需求进行测算、评估,同时实现工装产能的量化评估,为工装资源的合理配备提供了重要依据.     

某型直升机用关节轴承安装工装的设计改进

针对某型直升机用关节轴承在使用过程中出现的松脱故障现象,进行了松脱故障的原因分析,发现了轴承安装工装存在设计缺陷,提出了轴承安装工装的设计改进方案,运用Pro/E软件进行轴承和轴承安装工装各零部件的三维建模和虚拟装配,应用MSC.Patran软件进行了有限元分析,分析表明该轴承安装工装设计改进方案,能够满足轴承翻边变形的技术要求,该工装设计改进方案合理可行。     

基于PDM的叶片类零件工装设计系统

针对目前航空发动机典型零件——叶片类零件工装设计系统现状 ,提出了将 PDM技术应用于叶片类零件工装的设计与管理 ,建立了系统集成模型。根据建立的集成模型 ,讨论了在叶片类零件工装集成设计系统中要实现的关键问题。同时通过对 CAD系统的二次开发 ,建立了用户可自行扩充的标准件和通用件库。通过在某航空发动机公司进行应用 ,大大提高了叶片类零件工装设计的效率 ,缩短了设计时间     

基于坐标孔的数字化柔性工装定位技术

为在一套数字化柔性工装上实现多产品装配工作,根据某型飞机前缘襟翼结构特点,对柔性工装定位技术进行研究.采用内定位的装配方式,以骨架外形作为装配基准,以梁、肋的坐标孔为定位基准设计柔性工装,明确工装各组成立柱式三坐标定位单元的定位功能,设计了面向多装配对象的多用途定位器,采用三排平行布局柔性定位方案规划各立柱行程要求,建立DELMIA装配工艺仿真模型,确定柔性工装定位方案.通过实例验证,该柔性工装可完成整套装配对象的装配工作,定位精度与装配精度满足设计要求.     

星载有源相控阵天线总装集成工艺概述

对某星载有源相控阵天线总装集成涉及的天线吊装、防静电膜装配、半刚电缆装配等关键工艺技术进行了重点阐述。在受现场条件制约的情况下,通过合理设计工装、制定吊装方案,顺利完成了天线的总装集成。同时也从多余物控制、螺钉紧固方法等方面总结了天线总装集成过程中积累的工程经验。     

航天动力系统用精密齿轮箱的集成制造工艺

以某航天动力系统用齿轮箱箱体的制造为例,针对其制造过程中存在的瓶颈短线问题,从加工过程中的变形控制以及集成加工工装装夹方案出发,对航天动力系统用精密齿轮箱箱体类零件的数控集成制造工艺进行了深入研究。研究结果表明,通过在产品坯料适当部位设置工艺夹台并结合工装的使用,可以实现齿轮箱箱体的集成制造。该研究成果在航天动力系统用齿轮箱箱体类零部件研制中得到广泛推广和应用。     

真空壳体加工工艺方案

分析了真空壳体的特点及技术要求,制定了正确的工艺方案,设计了简单实用的工装夹具,经过实践证明,该工艺方案正确,工装设计合理,完全保证了真空壳体的技术要求。     

基于三维CAD的智能化工装设计与管理系统研究

分析了工装设计的特点;设计了基于三维CAD系统的智能化工装设计与管理系统,阐述了系统的结构、功能、工作流程以及与其它系统的信息集成,并以UG的三维软件为基础实现了原型系统.     

真空壳体上法兰的焊接及形位误差测量

分析了真空壳体的特点及技术要求,制定了焊接方案和误差测量方法,设计了几种实用的焊接及检测工装,经过实践证明了该工艺方案正确,工装设计合理。     

离散制造企业应用集成开发研究

在分析离散制造企业应用集成(EAI)特点的基础上,构建了基于Web Services技术和分布式网络环境的,适用于离散制造企业的应用集成框架.根据集成应用的特点,将集成分为结构树类型信息集成、消息集成、复杂对象类集成、过程集成和界面集成5类,并给出了具体的集成实现方案.最后,以质量系统与其他应用系统的集成实现为例,说明了该框架及技术实现方案的有效性.     

基于RGV轨导柔性线环境离散型零件生产过程管理与实践

为满足航空中小型结构件快速交付的需要,以提升航空中小型结构件制造高精度、自动化和高效率为目标,通过对航空中小型结构件加工现状进行梳理分析,搭建柔性生产线自动排程与调度平台,实现柔性生产线工艺设计与准备过程管理,简化工艺准备流程,推进快换工装的应用并进行自动化程序管理;在柔性生产线加工运行过程中采用可视化管理方法,推动自动化环境下加工过程资源保障集中化管理。最终使该管理方法在某项目中进行成功实践,取得了良好的经济效益。     

Rapid Sheet Metal Manufacturing. Part 1: Indirect Rapid Tooling

Rapid sheet metal manufacturing (RSMM) is a closed loop process for making sheet metal products which uses advanced computer-aided techniques and computer-controlled machines to produce non-ferrous tooling directly or indirectly. The tooling would be suitable for short-run production or design evaluation of sheet metal products for which prototyping cost and lead time are greatly reduced. The key aspect of this closed-loop process is the method used to fabricate and modify the sheet metal forming tool. Various approaches are adopted in the preparation of the tooling for onward embossing on a sheet metal. The three indirect approaches use selective laser sintering (SLS), stereolithography (SLA), and high-speed computer numerical controlled (CNC) milling to build the masters from computer data models. The masters are used in the vacuum casting process to generate the non-ferrous tooling. Comparisons on quality, lead time and cost are presented.     

具有交货期和工装数量约束的平行机调度

提出了一类具有工件交货期和工装数量约束的平行机调度问题.以降低部件拖期惩罚总费用为目标,建立了该问题的数学模型.提出一种遗传与模拟退火相混合的算法来求解该类问题,即GASA算法.算法在初始种群的生成上,采取了随机生成和按启发式规则生成相结合的方法;并引入模拟退火算法作为变异算子,以提高种群的多样性.最后,通过实例仿真,验证了GASA算法的有效性,并与GA算法进行了对比,对比结果表明GASA更优越.     

薄壁零件数控加工工装夹具研究

本文对铝合金薄壁零件数控加工工装夹具进行了分析和研究。通过分析零件数控加工特征和加工要求,设计制造了壳体和滑块组合工装,并对定位和夹紧装置进行了改进。通过使用壳体和滑块组合工装、新的定位和夹紧装置,使模块在该工序的一次合格率由94%提升到100%,生产准备时间由20min缩短至5min,产品质量和生产效率明显提升。     

Algorithms for efficient planning and operation of a particular FMS

This article is a detailed case study of a particular FMS that will be operational in 1989. It describes the daily planning and operating problems that will need to be addressed. The algorithms that will operate this system are presented. Given the daily changing production requirements, the algorithms begin with an aggregate planning feasibility check. Then planning, scheduling, inventory management, and breakdowns are addressed.The key problems in operating this system are tool management problems. Detailed tooling data and their analysis are presented in an appendix to address these problems.     

A computational system for process design of injection moulding: Combining blackboard-based expert system and case-based reasoning approach

The process design of injection moulding involves the selection of the injection moulding machine, mould design, production scheduling, cost estimation, and determination of injection moulding parameters. Expert system approaches have been attempted to derive the process solution for injection moulding in the past few years. However, this approach has been found to be incapable of determining the injection moulding parameters owing to the difficulty in setting the moulding parameters. In addition, the existing expert systems for process design lack the proper architecture for organising a heterogeneous knowledge source. In this paper, the combination of a blackboard-based expert system and case-based reasoning approach is introduced to make up the deficiencies of the existing expert-system approach to the process design, from which a computational system for process design of injection moulding, named CSPD, was developed and described. CSPD first derives the process solution including the selection of injection moulding machine and mould base, tooling cost, and processing cost estimation, and production scheduling based on the blackboard-based expert-system approach. It is then followed by the determination of the injection moulding parameters based on the case-based reasoning approach and the previously derived partial solution.     

飞机框组件工装的模块化设计研究

以工装通用性设计为研究重点,以期节约工厂的装配生产用地,缩短飞机生产制造周期.主要采用模块化设计思想,综合分析框类零件的结构形式和连接特点,结合柔性工装装配技术,设计一套某机型后机身三个框的通用工装,进行三维实体建模,实现工装的快速定位和拆装,减少夹具和定位器的数量,验证工装模块化设计方案.     

<Emphasis Type="Italic">Rapid Moulding Using Epoxy Tooling Resin</Emphasis>

Rapid prototyping (RP) is fast becoming a standard tool in today’s product design and manufacturing environment. Significant benefits in terms of lead time and cost savings have been reported with the use of RP technology. However, these benefits can be derived only during the design and planning stages of a new product where RP parts are produced in small quantities for design evaluation, form fitting, and marketing analysis. The high cost of raw material stock used in current RP systems makes them economically unsuitable even for small-batch production during the product evaluation and manufacturing stages. Further to this, the difference between the mechanical and physical properties of RP and traditional manufacturing materials limits the functionality of RP end products. Rapid tooling (RT) technology has opened up new cost-effective solutions for small-batch production. In this paper, a technique using a rapid soft-tooling approach, namely, aluminium filled epoxy resin tooling for injection mould preparation is successfully explored. An aluminium filled epoxy resin mould is evaluated and the characteristics of the injection-moulded end products are presented.     

A computational system for process design of injection moulding: Combining a blackboard-based expert system and a case-based reasoning approach

Process design of injection moulding involves the selection of the injection moulding machine, mould design, production scheduling, cost estimation, and determination of injection moulding parameters. An expert system approach has been used to derive the process solution for injection moulding over the past few years. However, this approach is found to be incapable of determining the injection moulding parameters owing to the fragile nature of the knowledge for setting the moulding parameters. In addition, the existing expert systems for process design lack proper architecture for organising heterogeneous knowledge sources. In this paper, the combination of a blackboard-based expert system and a case-based reasoning approach is introduced to eliminate the deficiency of the existing expert-system approach to process design, from which a computational system for the process design of injection moulding, named CSPD, has been developed. CSPD first derives the process solution including the selection of the injection moulding machine and the mould base, tooling cost, processing cost estimation, and production scheduling based on the blackboard-based expert-system approach. It is then followed by the determination of the injection moulding parameters based on the case-based reasoning approach and the previously derived partial solution.     

Tooling design in sheet metal forming using springback calculations

A method to design tooling in sheet metal forming using springback calculations is presented. The designed tooling produces a part which matches the desired shape, thereby compensating for springback. To design the appropriate tooling, traction distributions on the sheet in the fully loaded deformed state are computed using the finite element method. The calculated tractions are then used to numerically reproduce springback of the desired part shape by elastic unloading of the part in a reverse manner. The method is examined for materials covering a range of steel strength and hardening, and is found to produce parts with negligible shape error. The success of the tooling design algorithm leads to a proposal for an experimental method to design tooling based on traction distribution measurements.