基于Autodesk Inventor的三维参数化设计方法

应用三维Autodesk Inventor软件,以机械振动装置中板簧组件为例,介绍了零件的造型建模过程、零件的虚拟动画装配及判断虚拟装配中各零件之间是否相互干涉,从而对干涉的零件进行修改和结构调整的设计过程.体现了Autodesk Inventor软件在三维参数化设计中的强大功能及现代设计的优越性.     

基于关联技术的自顶向下设计技术的应用研究

针对自底向上的设计建模技术存在的不足和自顶向下的设计方法在实际应用中存在的问题，提出了基于关联的自项向下的设计建模实施技术，并对自项向下的设计技术的实施方法中产品、部件(子部件)、零件间的依附关系进行了研究。结合某集尘器挂架的设计建模对自顶向下设计建模技术实施中涉及的装配树的建立、产品级控制结构的建立、产品级控制结构的发布、相关的详细设计等关键技术进行了总结和探讨。     

基于模糊聚类的产品合理子装配划分

将模糊数学中的一些概念和理论引入产品合理子装配的划分之中 ,提出了产品零件集合的直积空间上的模糊紧密度关系、模糊装配连接图、模糊装配矩阵、产品模糊聚类等概念 ,并给出了基于产品模糊聚类的产品合理子装配划分方法。     

Subassembly identification for assembly sequence planning

Assembly sequence planning is a typical of NP-complete problem which will spend a large amount of computation time or disk memory once the assembly becomes complex. The complex product or assembly is composed of many parts and the number of assembly relationships between them is numerous. To decrease the difficulty of assembly sequence planning of complex products, the subassembly identification methods are focused on. It aims to decompose a complex assembly into a limitative number of subassemblies. Each subassembly contains a relatively smaller number of parts and the assembly sequence planning tasks of them can be handled efficiently. The subassembly identification methods for assembly sequence planning are summarized with respect to assembly constraints. The assembly constraints including the topological, geometrical, and process constraints are considered and merged into the assembly models for subassembly identification. The assembly models are generally represented as directed or undirected assembly diagrams including these considered constraints. It is generally taken as the input information to generate appropriate subassemblies complying with the requirements. The graph theories and graph search algorithms, integer programming methods and the emerging techniques, such as the knowledge-based methods, the intelligent algorithms and the virtual technology, etc. are advocated to resolve the subassembly identification problem with respect to the assembly models. The hierarchical assembly tree is widely used to represent the results of subassembly identification. These useful methods are not only used to subassembly identification for assembly sequence planning, but also successfully referred to by product disassembly.     

A mathematical model and extension algorithm for assembly flexible flow shop scheduling problem

In this paper, a scheduling problem for a two-stage production system including machining operations and assembly operations is studied. In this system, a number of products of different kinds are produced. Each product is assembled with a set of several parts. The first stage is a hybrid flow shop to produce parts. All machines can process all kinds of parts in this stage, but each machine can process only one part at a time. The second stage is a single assembly machine or a single assembly team of workers. The considered objective is to minimize the completion time of all products (makespan). A mathematical modeling is presented, and since this problem has been proved strongly nondeterministic polynomial-time hard, a series of heuristic algorithms based on the basic idea of Johnson algorithm is proposed. Also, two lower bounds is introduced and improved to evaluate the final solution obtained from heuristic algorithms. The numerical experiments are used to evaluate the performance of the proposed algorithms.     

面向ASP与DFA集成系统的装配模型技术

针对并行工程中的产品装配设计与优化分析 ,提出了一种装配顺序规划与为装配而设计相集成的产品装配分析系统。重点分析研究了集成系统中的产品装配建模方法。首先对现有的各种典型的装配模型技术进行分析比较 ;其次 ,根据 ASP与DFA集成系统的需求 ,设计出了一种包含装配草图、装配关联图信息、装配结构树图、零件设计参数和连接参数等信息的装配模型结构。并结合实例分析了该装配模型的计算机实现方法     

基于功能结构树的工艺子装配体识别及其装配约束关系的分析

针对复杂产品工艺子装配体识别的问题,提出了一种基于功能结构树的工艺子装配体识别方法。首先给出了产品的功能子装配体和工艺子装配体的定义和性质,给出了判断功能子装配体间干涉关系的算法;然后通过分析功能子装配体间的干涉关系和稳定性,提出了识别工艺子装配体和生成装配工艺结构树的算法,并给出了工艺子装配体装配约束关系方程组的计算步骤,最后通过实例验证了所提出方法的正确性和可行性。该方法简化了子装配体的识别过程,为提高大规模装配体的装配效率提供了条件。     

基于子装配识别的产品拆卸序列生成研究

对含有较多零件的复杂产品拆卸方法作了讨论,提出了一种基于子装配识别的拆卸序列生成算法。根据装配连接图和干涉图识别出子装配体,然后将子装配体看作一个零件,采用装配经验知识与几何推理相结合的方法生成子装配体序列,最后以一个装配实例说明了算法的有效性。     

基于PLC的自动装配机控制系统的设计与实现

针对所速自动装配机的结构和功能要求,设计了一种基于PLC的自动装配机控制系统,详细介绍了系统的硬件结构和PLC地址分配情况,重点阐述了控制软件的开发过程及部分控制程序设计要点与内容,最后对自动装配机远程监控功能的实现,作了简要介绍.该自动装配机控制系统结构简单,可靠性高,显著提高了生产效率和产品品质,具有较高的实用价值.     

基于质量特征产品装配顺序规划的逆向推理算法探究

在Petri网柔性装配系统装配顺序规划中引入装配质量要素,并以装配零件的装配自由度,装配作业后稳定性,装配零件配合精度对装配质量的影响作为基本因子,提出装配质量置信度概念,解决柔性装配系统装配规划中装配质量及其定量化问题。根据装配形成的产品在Petri网装配状态图中表示为一个最终库所的特点,应用改进B树模型,提出仅以变迁信息的产品装配顺序规划Petri网逆向推理算法,简化装配顺序规划推理过程,对于多个变迁均可生成最终成品的情况,亦给出装配顺序规划的解决方案,并以摩托车发动机的装配为例,证明该算法是可行的。     

基于保质设计方法的液压万能试验机控制系统设计研究

保质设计是指在产品的设计阶段综合考虑影响产品质量的诸因素 ,将质量保证和管理融入到产品设计中的一种新设计方法。本文根据保质设计的基本思想 ,建立了基于质量功能配置的保质设计过程模型 ,在此基础上进行了液压万能试验控制系统的设计 ,并对该系统进行了理论分析     

Literature review of assembly line balancing problems

Mass production system design is a key for the productivity of an organization. Mass production system can be classified into production line machining a component and production line assembling a product. In this paper, the production line assembling a product, which is alternatively called as assembly line system, is considered. In this system, balancing the assembly line as per a desired volume of production per shift is a challenging task. The main objectives of the assembly line design are to minimize the number of workstations for a given cycle time (type 1), to minimize the maximum of the times of workstations for a given number of workstations (type 2), and so forth. Because this problem comes under combinatorial category, the use of heuristics is inevitable. Development of a mathematical model may also be attempted, which will help researchers to compare the solutions of the heuristics with that of the model. In this paper, an attempt is made to present a comprehensive review of literature on the assembly line balancing. The assembly line balancing problems are classified into eight types based on three parameters, viz. the number of models (single-model and multi-model), the nature of task times (deterministic and probabilistic), and the type of assembly line (straight-type and U-type). The review of literature is organized as per the above classification. Further, directions for future research are also presented.     

RFID技术在汽车变速器生产线上的应用

介绍了某汽车变速器厂家在物流和装配生产线上应用RFID技术的案例.该生产线将RFID技术应用于零配件配送管理、装配管理、产品质量检测和产品返工返修等各个环节,以实现有效的生产管理和产品质量追溯.分析了系统的应用需求,完整介绍了系统实施方案,包括系统总体部署、软件功能和应用流程以及编码等.通过该系统的应用,该生产线的零部件混批装配问题降为零,零部件信息完全实现了可追溯,单个产品的装配信息和质量信息实现了快速准确的查询,工作效率得到了明显的提升.     

基于客户参与设计的锻压机床快速设计系统研究

研究基于客户参与设计的锻压机床快速设计系统,快速设计系统将用户的性能要求转化为机床设计参数,计算并快速得到产品的设计方案,驱动锻压机床主机结构模板,快速得到产品三维模型,有效避免传统设计方法导致的装配干涉问题,得到客户满意的主机结构模型.快速设计系统在VC.NET环境下,利用Pro/toolkit提供的接口函数对Pro/Engineer进行二次开发,实现快速设计系统的开发,所开发的软件能够大幅度提高锻压机床的设计质量和效率.     

Application of Virtual Assembly Tools for Improving Product Design

Virtual product creation and product design analysis are essential for studies in the investigation into assembly feasibility and help reveal practical manufacturing constraints. This paper demonstrates an application of a virtual assembly tool DYNAMO for a grill plate assembly. Virtual simulation and assembly verification is illustrated. Both virtual simulation and assembly verification enable designers to identify potential assembly difficulties encountered in manufacturing and thus save time and cost in real production. The paper also examines factors that influence the efficiency of assembly, namely, assembly method, assembly sequence, and assembly time. Suggestions for redesign for assembly improvement provided by some design for assembly methods are also discussed.     

STC100valve数控阀门专用机床设计

针对阀门（闸阀）制造业阀门体的制造工艺要求,作者根据多年设计机床经验开发设计了一种高性能、高效率的数控阀门专用机床,并将模块化设计理念贯穿到专机设计中。该机床在分析市场需求及零件加工工艺的基础上进行设计,将镗床平旋盘技术成功地应用到车床上。可实现阀门行业阀门体零件的一次装夹,多工序复合化加工的要求。样机试制完成后,证明该数控专用机床可以很好地解决阀门加工效率和质量稳定性问题,设计是成功的。     

Design automation and optimization of assembly sequences for complex mechanical systems

Assembly sequence design for a mechanical system can have significant impact on manufacturing cost and product quality. Traditionally, such a design process is largely based on experience and best practices, often ineffective and non-optimal as the system becomes complex. This paper proposes a new, systematic method for automatic assembly sequence design and optimization. Key elements include assembly modeling, sequence planning, locating scheme optimization, dimensional quality evaluation, and optimization. First, a directed graph and an assembly matrix are employed to describe the assembly relation of a system. Then, the feasible assembly sequences are generated through layered subassembly detection of adjacency matrices, filtered by engineering constraints. To evaluate quickly the assembly quality and compare the influences of different locating point schemes, a linear 3D variation propagation analysis model with deterministic locating principle is introduced. The optimal locating scheme is then selected using a genetic algorithm with the least variation propagation. Finally, the assembly dimensional quality for different sequences is evaluated and the optimal assembly sequences are achieved through genetic algorithms. A case of automotive body side assembly is presented to illustrate the whole methodology.     

基于语义关联与驱动的产品概念装配模型研究

面向概念设计的装配模型表示是机械产品装配建模技术研究的一个重要问题,现有的基于几何约束关系的CAD系统不能很好地解决这一问题。基于装配语义“三位一体”性给出了面向概念设计的产品装配模型表示方法,提出采用装配语义关联图表达零件之间的装配语义关系,通过装配语义关联图建立起支持概念装配模型的多层次语义关联和基于语义的装配驱动,从而实现机械产品从概念设计出发的自顶向下和从详细设计出发的自底向上的双向设计。     

An investigation into design and manufacturing of mechanical conveyors systems for food processing

This paper presents the results of a research investigation undertaken to develop methodologies and techniques that will reduce the cost and time of the design, manufacturing and assembly of mechanical conveyor systems used in the food and beverage industry. The improved methodology for design and production of conveyor components is based on the minimisation of materials, parts and costs, using the rules of design for manufacture and design for assembly. Results obtained on a test conveyor system verify the benefits of using the improved techniques. The overall material cost was reduced by 19% and the overall assembly cost was reduced by 20% compared to conventional methods.     

轻型卡车底板纵梁生产线的机器人焊接仿真

用ROBCAD对机器人焊接纵梁总成系统建模和仿真。对人工焊接生产线重新进行工艺规划和生产线布局,为机器人、焊枪、夹具、输送装置、纵梁等关键装备、部件及生产线布局建立仿真模型,在模型中进行焊点可达性测试和机器人干涉分析。通过观察仿真过程可判断机器人焊接纵梁总成系统运行正常,仿真可提高改造项目的设计效率和设计质量,降低改造项目的实施难度和实施周期。仿真结果表明,机器人焊接的生产节拍比人工焊接降低23.03%,从产品质量、车间物流、生产管理方面论证了机器人焊接相对于人工焊接的优越性。