基于CAXA的战斗机工艺品模型的设计及制作

利用CAXA软件对战斗机工艺品模型的上模、下模、支撑架、滚轮进行三维造型设计,同时设定相关设计参数及制定加工工艺路线,并进行了仿真模拟加工和数控编程后置处理;运用数控加工中心机床进行战斗机模型实体曲面加工,采用普通车床对战斗机支撑架、战斗机滚轮进行实体加工,最后运用钳工工艺进行整体装配,最终完成战斗机模型的设计及制作过程.     

内螺纹冷挤压加工工艺设计系统研究

首先对挤压丝锥的设计和加工工艺参数的设计进行了研究,建立了内螺纹冷挤压输入模型、挤压丝锥结构模型和内螺纹冷挤压加工工艺模型。然后通过对业务功能需求的分析,建立了系统的体系结构。通过对加工工艺设计过程的具体分析,划分了系统的用户角色并给出了系统的业务流程。最后给出了系统挤压丝锥结构设计和工艺参数设计的应用实例。     

内螺纹冷挤压加工工艺设计系统研究

首先对挤压丝锥的设计和加工工艺参数的设计进行了研究,建立了内螺纹冷挤压输入模型、挤压丝锥结构模型和内螺纹冷挤压加工工艺模型。然后通过对业务功能需求的分析,建立了系统的体系结构。通过对加工工艺设计过程的具体分析,划分了系统的用户角色并给出了系统的业务流程。最后给出了系统挤压丝锥结构设计和工艺参数设计的应用实例。     

超大齿圈加工工艺的实例推理方法与设计系统实现

超大齿圈在大型装备上有非常重要的作用。超大齿圈具有单件小批的产品特性,提高加工工艺设计效率对于缩短产品周期,降低产品成本有重要意义。基于实例推理技术研究了超大齿圈加工工艺的快速设计方法,分析了超大齿圈加工工艺特点,给出了加工工艺实例的描述方法,提出了相应的工艺分类与相似性检索算法。开发了超大齿圈加工工艺快速设计系统,已成功应用于实际的工艺设计。     

支撑架深孔的断续切削加工工艺研究

支撑架是一种放置和发射导弹的装置,其内孔是由五条筋板组成的深孔结构,由于其结构的特殊性,传统的深孔加工方法难以完成,因此在充分分析其加工过程中的技术难点的基础上,提出了设计专用夹具、改进找正方法、改进深孔镗刀三项解决措施,最终确定了合理的加工工艺方案,成功解决了深孔断续切削不稳定问题,仅保证了内孔的加工精度和表面质量,又提高了支撑架装填效率和使用寿命,更降低了使用风险。     

并行公差设计与工艺路线技术经济评价方法

在界定并行公差设计概念的基础上,首次系统地给出了以总加工成本最小为目标函数、以装配功能要求、加工方法选择、加工余量公差、经济加工精度范围等为约束条件的优化数学模型,该模型能够对工艺路线进行一定程度地定量技术经济指标评价;论证了该模型是个非凸规划问题;最后给出了并行公差设计的一个仿真实例.     

考虑加工时间和可靠性的机床的动态优化选择

如何在工艺过程的设计中，解决这样一个综合效率问题?既要使工艺过程的可靠性高，又要使工艺过程的加工时间尽可能的少。这里提出了用动态规范法来解决这个问题的原理和方法，并举出了实例。     

圆桌机悬臂支撑架的有限元分析

悬臂支撑架是圆桌机的重要基础部件,它的动态和静态特性直接影响机床的加工精度及精度稳定性。采用有限元软件ANSYS,对悬臂支撑架进行静力分析与模态分析,得到应力分布规律和振动特性。静力分析结果表明该悬臂支撑架的强度和刚度都满足设计要求;模态分析结果表明加强筋和前后连接板的局部刚度相对薄弱,但悬臂支撑架总体固有频率满足稳定性要求。根据分析结果,悬臂支撑架有优化的空间,为进一步改进支撑架结构提供了理论依据。     

挖掘机回转支撑架焊接质量的工艺控制

正1.概述挖掘机结构件的频繁使用使其对结构件的焊接质量要求较高,其中挖掘机下车架回转支撑架部分具有尺寸轮廓大,整体加工难的特点,所以要加强对回转支撑架焊接过程的工艺控制,从而提高生产节拍和产品质量。本文对挖掘机回转支撑架的机器人焊接及前面工序采取工艺控制,使得在回转支撑架制造过程中容易出现的偏焊、搭接不良、气孔、裂纹、接头不良及成形差等缺陷得到有效的控制。回转支撑架(见图1)是挖掘机重要承载部件中的主要组成部件,属于空间箱体型的对称焊接结构,主要由上盖板、下盖板、肋板、上支撑环和下支撑环等部件组成。     

工艺约束条件下加工顺序决策的Petri网T_不变量方法

针对计算机辅助工艺设计中一直没有解决的加工顺序决策问题,提出了一种新的基于Petri网T_不变量的加工顺序决策方法。首先根据Petri网原理和产生式规则建立了一个基于规则的加工顺序决策Petri网模型;然后在考虑工艺约束的条件下,给出了可选工艺路线T_不变量的生成算法;最后通过一个实例验证了该算法的合理性和有效性。实例结果表明,所提出的决策方法能够实现从可选工艺路线中得到最优/次优的工艺路线。     

Choice of Cost-Estimation Functions Based on Statistical Quality Criteria and Technical Coherence

This paper studies the problem of choosing cost estimation functions by mixing statistical regression criteria and technical coherence. The parametric cost estimation method which looks for functional relationship between cost driver variables and the product cost is particularly well adapted to early economic evaluation during the design phase; it is simple to implement, efficient, and reactive enough to provide a powerful guideline for the designer. These cost estimation relationships (CER) are generally computed using linear or nonlinear regression algorithms. However, the problem is to identify and to choose the best CER among several candidate formulae which have been developed. In many cases, the statistical regression quality and estimation criteria are not sufficient. It is also necessary to consider the technical coherence of the CER as defined by the experts in the application domain. Therefore, an additional problem is to make these different points of view consistent. In this paper, the authors adopt a weighted multicriteria decision approach. The characteristics of the different quality criteria are described, then three practical selection methods are presented. All these methods measure the general quality of CERs, taking into account both technical and statistical points of view. The methods are based on a measure of quality using a weighted sum of normalised criteria, a weighted ranking method, and an original use of a similarity measure in the criteria space. These methods are then tested and compared using a real case.     

Applying grey model to prioritise technical measures in quality function deployment

The traditional approach to prioritise the technical measures in quality function deployment is to view an entire process as a decision-making problem and to use a one-to-one relationship, a standard series versus a compared series, instead of using a systematic viewpoint to determine the importance of technical measures by assuming the technical measures are independent. In this study, grey model, both GM(1,N) and GM(0,N) models, is applied to determine the priority of technical measures by evaluating the impact of each technical measure in the system. The technical measure with the highest impact in the system is considered to be the most important technical measure. Therefore, technical measures can be prioritised by their respective impacts in the system.     

基于QFD与TRIZ技术工具的产品概念设计方法

为消除产品概念设计过程中可能产生的二层问题的负面影响，提出了一种基于质量功能配置与创造性解决问题理论的三种技术工具综合的产品概念设计方法。该方法通过质量功能配置的质量屋分析确定需要改善的零部件；在对零部件进行负相关分析的基础上，应用创造性解决问题理论技术工具提出解决一对质量特性负相关的方案；然后通过多次循环的质量功能配置分析与创造性解决问题理论技术工具应用，预测可能产生的二层问题并降低其负面影响，进而形成有效的产品概念设计方案。通过在某全自动洗衣机研发过程中的实际应用，验证了该方法的有效性和实用性。     

An evaluation model of product upgradeability for remanufacture

In this paper, a mathematical model of product upgradeability is proposed to provide a holistic measure at the design stage for a product’s potential to serve an extended use life and accommodate incremental changes/improvements of its functionality in the context of remanufacture. By using fuzzy set theory, the formulation of upgradeability model is focused on representing and measuring the effects of essential product technical factors. The ease-of-upgrade feature of a product is represented in terms of its technological, functional, physical, as well as structural fitness. Subsequently, three key indicators, namely compatibility to generational variety (CGV), fitness for extended utilisation (FEU), and life cycle oriented modularity (LOM) are developed to feature and evaluate the overall upgradeability potential of a product, providing insightful indications for any further improvement or redesign to base on.     

基于成像式照度探测的菲涅尔光学助降系统检测方法研究

为了解决菲涅尔光学助降系统(FLOLS)的检测问题,文中根据FLOLS检测应满足的技术指标,提出了一种基于成像式照度探测法的菲涅尔灯发光强度测量方案,并根据分析设计研制了成像式照度探测装置。通过试验,结果表明该装置可远距离对大口径、大发光角度的菲涅尔灯进行发光强度的探测,满足菲涅尔光学助降系统检测装置测量的要求。     

EVA-625在电梯乘运质量测量中的应用

EVA-625电梯综合性能测试仪可以一次性完成电梯运行加速度、速度、加加速度、振动峰峰值、声音等乘运质量指标的数据采集和数据分析,广泛用于电梯乘运质量测量。本文简要介绍了EVA-625的结构组成,详细描述了利用EVA-625测量电梯乘运质量的步骤,并利用随机软件对测量结果进行了图形显示和数据分析,结合有关电梯技术标准给出了评价依据,最后对利用EVA-625提升电梯检验服务能力提出了建议。     

Integration Planning Model of IDEF0 and STEP Product Data Representation Methods in a CMM Measuring System

The measuring process using a CMM involves a large amount of data. It is necessary to understand and clearly define the data required by the measuring process and the relationships of these data before incorporating automation into a CMM system. This paper uses the IDEF0 model to analyse the measuring function requirements for solving the problem of ambiguous internal information flow and material flow during the measuring process. A data module for the CMM measuring system was developed using the EXPRESS language in STEP, to support the IDEF0 function process module. An information flow design model was also established, which integrated the IDEF0 process requirement analysis model and the EXPRESS data module. The objective is to enhance the efficiency of the development of measuring systems by system designers, and to provide a basis for future development of measuring information systems using STEP data formats.     

Premachining Computer Numerical Control Contour Validation

The current procedure followed to manufacture a new part by computer numerical control (CNC) machining is to write the part program, machine a test part, and measure the test part for conformance to the required dimensions and tolerances. If the test part dimensions are incorrect, the part program is modified, and the process is repeated until a successful part is machined. In many applications, such as the aerospace industry, where material cost and machining time are high, this iterative process becomes economically unacceptable. Research has been conducted to test the feasibility of using the laser ball bar (LBB), a spatial coordinate measuring device, to measure dynamic continuous path contours of CNC part programs to micrometer accuracy before machining. In this way, a virtual test part can be measured and compared to the design drawings to validate the CNC part program. This reduces or eliminates the costly and time-consuming steps involved in the machining of physical test parts. This paper outlines the testing method and results acquired using one LBB to measure dynamic part paths employing sequential trilateration. A circular contour was measured using an encoder trigger for data capture. The radial error motions of the spindle used to generate the circular contour were also measured using a capacitance probe nest to verify the LBB results. Comparable error waveforms between the LBB and cap probe measurements verified the possibility of using the LBB to measure dynamic continuous path contours. Future work using three LBBs simultaneously is also outlined.     

电力传输线路中电流测量系统的设计和实现

基于法拉第效应的光学电流互感器（OCT）,提出了电力传输线路中电流测量方案,解决了OCT中光照度信号的自动增益均衡化问题;利用锁相环技术实现了测量过程中采样信号相位同步,提高了电流测量精度;对提出的测量电路方案进行了测试与分析。     

旋转基板的激光测温

激光测温是一种先进的温度测量方法。它具有测量准确、反应速度快、非接触等特点 ,尤其适用于测量真空镀膜中基板的温度。但目前的测温对象只能是固定的基板 ,因而还不完全实用。我们新发展了一种自动测温系统 ,可以对旋转基板的干涉条纹移动进行计数 ,从而实现了旋转基板的测温 ,使激光测温技术更具实用性。介绍了该系统的原理、设计并给出了一次实际测温的结果