基于并行工程的零件可制造性研究

用并行工程的思想，对零件可制造性进行较详细的分析。得出并行工程环境下的零件制造性能设计框架，给出一个集成的DFM系统实例，深入研究基于DFM实施方法。应用表明了本结构模型的可行性和可操作性。     

并行工程在绿色制造中的应用

将并行工程的理论和方法应用于绿色制造之中,阐述了绿色设计的概念和特点,并对绿色设计的体系结构及其关键技术进行了深入的讨论。     

带凸缘高圆筒件一次拉深成形新工艺的数值分析

提高板料的成形性能始终是拉深工艺中的一个关键因素,本文分析了一种能大幅度提高板料成形性能的新工艺措施。这项新技术是通过减小压料接触面上的流动阻力,实现对板料成形性能的优化。文中采用这一新工艺措施对带凸缘的高圆筒件的一次拉深成形过程进行有限元数值模拟,得到很好的验证,同时分析了这项新技术的机理。     

盒形件成形工艺分析及模具设计

通过对某矩形盒形件进行工艺性分析,确定了拉深、切边翻边、冲底孔(复合模具)的工艺方案。介绍了该复合模具的工作过程及设计要点。采用该模具大大提高了生产效率,保证了此矩形盒形件的尺寸精度,提高了企业的经济效益。     

铁路车辆零件成形修复工艺和基于Solidworks的可转位成形铣刀设计

铁路车辆上部分零件磨损后,需要修复再利用.成形铣削工艺比旧工艺效率高、误差小、易操作.采用传统方法设计可转位成形铣刀,会遇到整体刃形搭接、刃形误差控制、刀片位置确定等既繁琐又易出错的复杂问题.利用Solidworks软件的实体建模操作功能可以很方便地解决可转位成形铣刀设计中的难点问题,并使整个设计过程变得简单而快捷.     

雷达波导件塑性成形工艺分析及有限元数值模拟

以雷达上的波导件为研究对象,针对传统加工工艺的缺点以及工件形状特点,提出挤压成形工艺方案。利用有限元分析软件DEFORM对该工件的关键成形工序—反挤压过程进行刚塑性有限元数值模拟研究。通过数值模拟,观察到在不同压下测量时毛坯的等效应力、等效应变云图及挤压力与行程图,得到其金属流动规律,为合理设计模具和验证工艺提供依据。     

测头自动检测系统在激光冲击成形中的应用

激光冲击成形是一个受多因素影响的过程,在开环控制条件下,工艺条件改变时,成形系统不能做出适当的调整,因而无法获得期望的成形效果。为了解决这个问题,通过不断地调整加工工艺,最终获得了几何性能(尺寸精度、表面粗糙度)和力学性能达到设计要求的三维实体工件,从激光冲击成形使用自动检测系统的必要性出发,介绍了自动检测系统的组成,触发式测头自动检测系统的工作原理,及其在激光冲击成形中的工作过程。     

冲压模具零件的成形磨削工艺分析与设计

根据冲压模具零件图纸及技术要求进行工艺分析,通过模具工艺方案设计得出平面磨床成形磨削的加工方法和砂轮修整方法以及工艺尺寸计算,拟订平面磨形磨削工艺。同时,提出工件磨削步骤及注意事项,并对成形磨削工件进行精度检验及误差分析。实践证明:成形磨削工艺分析计算准确,公差分配合理,精度检验及误差分析有效,制造精度高。     

An Information Modelling Framework to Support Intelligent Concurrent Design and Manufacturing of Sheet Metal Parts

Sharing of information is an important issue in supporting integrated and rapid product development. The use of information modelling technology is a promising approach for solving the problems of the intensive sharing of information in a concurrent and rapid product development cycle. This paper explores the definition and the structure of a framework of information modelling for the concurrent design and manufacturing of sheet metal parts. This framework aims to build an information bridge to fill the gap between the sheet metal part design and manufacturing systems. It is based on abstract handling principles of entities called zero thickness and zero bend radius principles. Based on this framework, information models can be built for information sharing by different systems. Knowledge bases that support intelligent concurrent design and manufacturing can also be created. In this paper, a two-branch tree based stepping-structure information modelling methodology for sheet metal parts is described, and a case study is given.     

单榫头叶片锻造过程成形缺陷分析

折叠和模腔充不满是锻造过程中常见的成形缺陷 ,利用自行开发的叶片锻造过程三维刚粘塑性有限元模拟分析软件 ,通过对叶片锻造过程不同截面金属流动规律的三维有限元模拟分析 ,可以预测叶片锻造过程成形缺陷折叠和充不满的形成。通过改变毛坯尺寸和成形工艺参数 ,可以消除这些成形缺陷的产生 ,并获得合格叶片锻件。该研究对其它种类叶片锻造过程中成形缺陷的分析具有一定的指导意义     

并行式面向材料设计的分析与研究

针对现行传统设计方法中材料选择方面所存在的问题,分析了环境协调性材料的特征,提出机电产品开发中并行式面向材料设计技术和关键技术,以改善环境影响。     

并行工程在新舟60飞机内装饰设计制造中的应用

并行工程是一种有别于顺序 (串行 )工程的产品开发方法。实施并行工程可以有效地缩短产品开发周期 ,降低产品成本 ,提高产品质量。本文结合西安飞机工业公司在新舟 6 0飞机内装饰设计制造中应用并行工程的实例 ,就并行工程中的关键技术 :产品数字化定义、组织设计与建模、产品开发过程设计及建模、PDM工程实施、使能工具等做一综述     

多层杯筒形零件流动控制成形工艺分析及成形力的计算

针对轿车安全气囊铝合金压盖零件，提出并分析流动控制成形工艺及控制腔的设计方法，给出了成形力的计算模型与近似计算公式。介绍了工艺实验的效果。试验结果表明，所提出流动控制成形技术具有重要的应用价值。     

Analysis of Strain Rates and Microstructural Evaluation during Metal Forming: Role of Surface Texture and Friction

The surface texture of a die plays an important role in friction during metal forming. In the present study, unidirectional and random surface finishes were produced on hardened steel plate surfaces. To understand the influence of surface texture on friction, experiments were conducted using Al-Mg alloy pins that slid against steel plates of different surface textures. In the sliding experiments, a high coefficient of friction was observed when the pins slid perpendicular to the unidirectional grinding marks and low friction occurred when the pins slid on the random surfaces. Finite element simulations were performed using the measured friction values to understand the stress and strain evolutions in the deforming material using dies with various friction. The numerical results showed that the states of stress and strain rates are strongly influenced by the friction at the interface and hence would influence the final material microstructure. To substantiate the numerical results, laboratory compression tests were conducted. Different surface textures were obtained in order to experience different friction values at different locations. A large variation in the microstructure at these locations was observed during experiments, verifying that surface texture and die friction significantly influence fundamental material formation behavior.     

A Contribution to the Study of Tolerancing Technology

Tolerancing technology is a basic tool for the study of interchangeable assemblies and for various kinds of mechanical function. The problem of the congruence of the design–product system is studied in this work, as a particular case of more complex designing–production integration. The proposed approach is based on entropy principles. An a priori probability distribution regarding design and an a posteriori probability distribution regarding the product are assumed. The distance between such distributions permits us to evaluate the above congruence. The proposed model, which is made more user friendly by transforming the probability approach into a fuzzy approach, is a useful tool for the control of production systems, e.g. for the variation control of features.     

图像处理系统在自动化设备中用作位置反馈的一种方法

在自动化设备中采用图像处理系统做位置反馈,保证了系统位置精度,系统成本低、使用方便。改进了模板匹配的算法,使处理速度大幅提高。     

方锥形渐进成形制件误差补偿工艺研究

成形精度低是制约金属板料渐进成形技术推广应用的重要因素。通过对方锥形渐进成形制件的精度测量发现,制件拐角处和高度方向尺寸精确,而侧壁处产生鼓凸,侧壁中心位置鼓凸高度最大。针对方锥形渐进成形制件的侧壁鼓凸问题,提出了一种变形求解方法,并将求解结果与实际测量结果进行对比,发现结果基本吻合。根据构建的侧壁形面模型,建立了方锥形渐进成形制件的补偿工艺,试验证明该工艺可以显著提高方锥形渐进成形制件的尺寸精度。     

An Internet-based integrated product design environment. Part II: its applications to concurrent engineering design

Concurrent or collaborative engineering (CE) has inspired research in the area of design decomposition, which facilitates the concurrency of product lifecycle functions from the earlier stage of the product development process and reduces the complexity of a design problem. The decomposition-based design, on the other hand, necessitates various integration efforts for recombining the decomposed design problems. This is the second of a two-part paper proposing a multi-agent system (MAS) framework for integrated product design in a computer network-oriented CE environment. Part II discusses the applications of the proposed MAS framework to concurrent engineering design. The proposed framework realises the systematic and timely design integrations between multi-functional/cross-functional team members in a dynamic design environment, by enabling model integration, solution integration and tool integration. The proposed design agents make the problem-specific engineering models or heterogeneous design tools interoperable and network-accessible, and also provide the interaction spaces for communicating, integrating or coordinating the individual design solutions. Throughout the paper, the proposed system is illustrated with a successful implementation of a continuously variable transmission (CVT) design problem over the Internet .