汽车支架的垂直分型铸造工艺的模拟优化

以某球铁板形铸件为研究对象,用DISA线垂直分型的浇注系统设计方法设计了铸件的浇注系统,用均衡凝固理论设计了铸件冒口,用数值模拟方法对设计工艺进行了反复的对比优化,并实际浇注铸件进行了验证。研究表明：①用均衡凝固理论设计冒口时,不能只局限于用几何结构来划分结构分体,还要根据壁厚差的情况才能划分出合理的结构体。②底注式浇注系统并非总是最为平稳的浇注系统,而这一点是传统经验设计方法很难意识到的;用数值模拟的方法就容易寻求合理的浇注方案。③均衡凝固理论结合数值模拟方法是有效的铸铁件工艺设计手段。     

带包类后桥壳的铸造技术

介绍带包类球墨铸铁后桥壳铸件的生产工艺.通过合理熔炼、造型、制芯及铸造工艺参数,采用冲天炉熔炼,手工造型制芯,实现批量生产优质带包类桥壳球铁件.     

纳米TiO2在汽车面漆中的应用研究

阐述了纳米TiO2对汽车面漆性能的影响机理,提出了利用纳米TiO2提高汽车面漆耐老化性的设想,制定了纳米TiO2涂料的配方,并研究分析了纳米TiO2对汽车面漆性能的影响规律.通过实验对漆膜的光泽度、附着力、冲击强度、硬度、耐水性、耐老化性等进行检测,当纳米TiO2的加入量为1.0%～2.0%时,涂层的耐老化性能平均提高20%左右,其光泽度也有所提高,而附着力、冲击强度、硬度、耐水性提高不明显.     

空气弹簧系统的计算机虚拟设计

随着计算机科学的迅猛发展和工程力学有限元分析理论的不断成熟,空气弹簧的设计和开发由早期主要依靠试验和实际运用中得到的数据来改进转向了计算机虚拟设计与试验相结合的渠道上来.本文运用CAD软件建立了空气弹簧系统的三维立体模型,通过有限元分析,建立了空气弹簧系统的有限元模型,并进行了垂向力学特性分析,其结果与试验结果相一致,为空气弹簧的设计和制造提供了有益的参考.     

Development of a gap searching program for automotive body assemblies based on a decomposition model representation

Automobiles, aircraft, and ships require tremendously many parts to be assembled. For developing such large assemblies, most companies accelerate the design process by having many design engineers in different functional or sectional design groups working concurrently. However, interferences and gaps can be found when the parts and sub-assemblies of different design groups are to be assembled. These error cause design changes and additional repair processes, resulting in an unexpected increase in costs and time delays. While the interference problem has been resolved by digital mockup and concurrent engineering methodology, many cases of the gap problem in the automotive industry have been covered by temporary treatments when the gaps are small enough to be filled with sealants. This kind of fast fix can cause leakage into the engine chamber and passenger cabin when the gap size is too big for filling or when the sealant gets old, which can turn fatal. With this research, we have developed a program to automatically find gaps between the parts of an assembly so that design engineers can correct their designs before the manufacturing stage begins. By using the method of decomposition model representation, the program can visualize gaps between complex car body parts as well as estimate their volumetric information. It can also automatically define the boundary between a gap and the exterior space. Although we have reviewed the benefits of the program by applying it to car development, it can also be applied to aircraft and ship designs comprising several parts.     

一种可配置数据结构模型在汽车工程数据库中的应用

为了建立支撑汽车研发的数据库平台,在分析汽车工程数据特点基础上,提出一种数据库结构设计方法。该方法借鉴部分面向对象思想,首先对技术指标体系进行抽象及划分,然后配置对象模型,最后实例化产生实体。基于此思路设计数据库表结构模型,并在汽车工程数据库建设项目中使用该模型作为基础架构。应用情况表明该模型能够有效地描述工程数据,并能满足扩展需求。     

超高速电梯气压控制系统的风口布局优化分析

超高速电梯在运行过程中,轿厢内气压的快速变化会对乘客的耳朵产生压耳感.为了减轻这种压耳感,有些超高速电梯内配备了气压控制系统,能够使电梯轿厢内的气压在运行过程中呈线性地变化,从而降低气压变化率,改善乘客的压耳感.但那些气压控制系统的风口布局方式会对乘客产生不舒适的吹风感.为了解决上述问题,提出了一种新的风口布局方式.为了验证其合理性,运用计算流体力学分析软件Fluent对气压控制过程中的增减压过程进行了数值仿真,并对不同送排风口的设置以及在不同的风口高度下,电梯轿厢内的风速场进行分析.仿真结果表明,采用非对称的风口布局方式在人体头部周围产生的风速较小,是一种较优的风口布局方式.     

Improved Quality Output through Computer‐Based Training: An Automotive Assembly Field Study

In this article, two field experiments, conducted in an automotive assembly plant, evaluate how computer‐based training of operational sequences and related quality information can support the assembly performance of the operators. The experiments were performed during the launch of a new vehicle. A comparison was made of learning progress and quality performance between a reference group of operators that only had regular training and a test group for which some of the regular training was replaced with individual computer‐based training. Both quantitative measures of the quality output and questionnaires and observations were used to evaluate the effects of computer‐based training. The results show a clear positive difference in learning progress and improvements in quality output for the test group compared with the reference group. This combined with positive attitudes expressed by the operators and their team leaders shows that this type of training is an effective way to train operators during launches of new vehicles in automotive production.