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针对在飞机装配过程中机翼对接准确度难以保证而影响飞机的气动外形和飞行平稳性的问题,建立了一种以关键测量特征的测量数据为节点的容差分配模型。基于测量辅助装配技术,对装配过程中飞机的关键测量特征进行定义。分析了机翼对接中关键测量特征间的几何关系,考虑了现场测量设备的测量不确定度,在此基础上建立了以关键测量特征的测量数据为节点的容差分配模型。试验结果表明,利用容差分配模型对机翼的安装角、上反角和对称性等进行容差分配,将分配的容差信息融入数字化装配系统,可以显著提高飞机装配的质量和效率。研究结果可以为飞机机翼对接过程中装配特征的定义和容差分配提供一定的理论指导。 相似文献
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针对目前国内航空制造企业飞机装配生产中所存在的装配质量与效率偏低、生产管理水平不高等问题,面向装配车间实际生产过程,设计开发了基于B/S结构的飞机装配可视化系统。首先,构建车间单一产品数据源信息模型,为不同角色成员开发相应功能模块;然后,使用DELMIA仿真装配过程,输出可视化文件;其次,使用ActiveX技术实现装配动画页面内的三维交互。最后,以某型号大型飞机舱门作为对象,集成验证了该系统的可行性与实用性。 相似文献
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数字化装配工艺设计和过程仿真技术在现代飞机的设计和制造中扮演的角色越来越重要。飞机数字化装配因其结构设计的三维化和复杂化以及装配工艺的数字化等原因,使得装配过程仿真成为飞机数字化装配及工装结构设计的必要手段。基于装配工艺文件映射技术和装配过程仿真模型,通过装配工艺过程及机构运动集成仿真技术的突破,实现了飞机复杂的结构件数字化装配过程的仿真。目前国际上以飞机为代表的大型复杂产品研制企业都已将数字装配技术应用与生产中,并取得显著的效益。 相似文献
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本文根据计算机辅助装配工艺过程设计(CAPP—for Ass,简称装配CAPP)对零部件装配描述的要求和装配工艺特点,开发了以关系数据模型为基础,面向装配的零件分类编码系统(HNG—88)。文中阐述了装配编码系统的基本原理和介绍其主要结构。该编码系统适用于对零件装配特征信息的描述和储存,有助于装配CAPP系统各部分之间信息的传递,具有柔性、使用灵活、易扩充、信息利用率高、使用范围广等一系列优点。 相似文献
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Selecting the assembly sequence and associated automatic assembly stations necessary to assemble a candidate product design is a critical step in the life cycle of a product. We present a method that determines the best sequence and set of stations using cost and performance measures. The method uses a multi-echelon optimization procedure based on simulated annealing. We show how simulated annealing can be used for such problems and present examples in which we determine the optimal assembly sequence for a product in an automated manufacturing environment. 相似文献
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Selective assembly is a method of obtaining high-precision assemblies from relatively low-precision components. In selective assembly, the mating parts are manufactured with wide tolerances. The mating part population is partitioned to form selective groups, and corresponding selective groups are then assembled interchangeably. If the mating parts are manufactured in different processes and in different machines, their standard deviations will be different. It is impossible that the number of parts in the selective group will be the same. A large number of surplus parts are expected according to the difference in the standard deviations of the mating parts. A method is proposed to find the selective groups to minimize the assembly variation and surplus parts when the parts are assembled linearly. A genetic algorithm is used to find the best combination of the selective groups to minimize the assembly variation. Selective assembly is successfully applied using a genetic algorithm to achieve high-precision assemblies without sacrificing the benefit of wider tolerance in manufacturing. 相似文献
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Assembly sequence generation requires information on both the part liaison relationships and precedence- constraints. This paper describes an algorithm developed to identify the part liaison relationships of a product assembly design, presented in the commercial package, I-DEAS. The algorithm is intended to support the automatic extraction of liaison precedence constraints and the automatic generation of liaison establishment sequences. 相似文献
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