共查询到19条相似文献,搜索用时 155 毫秒
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本文就 CAPP 计算机辅助工艺设计零件信息描述进行了探讨,提出了用特征编码+参数列表的零件信息描述方法,达到了完整描述零件信息的目的。建立了一个以零件特征编码为主,以零件形状尺寸参数为辅,分层描述的零件信息建模与零件信息输入系统。 相似文献
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基于AutoCAD的CAD/CAPP集成系统研究 总被引:2,自引:0,他引:2
鉴于国内外CAD/CAPP集成的现状,应用AutoCAD环境下的二次开发工具ObjectARX技术,能够和AutoCAD共享空间并直接和AutoCAD进行通信读取零件图形数据库中的几何和工艺信息,从而实现了零件二维图形信息的自动获取,并通过ADO数据库绑定技术完成了对数据库的写入、修改、查询等操作,避免了零件信息的二次输入和人工输入的错误,最终实现了CAD/CAPP的无缝集成。 相似文献
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箱体类零件是为机器或部件装配使用的基础零件,也是机器的重要组成部件,它能将齿轮、轴、套件等相关配件装配成一个整体,并能保证各个零件处于正确合适位置,以相应的传动关系互相协调工作以传递动力等。箱体是传动零件的基座,应具有足够的强度和刚度。因此,箱体类零件的机加工质量是非常重要的环节,它将直接影响到部件或机器的性能、精度与寿命。结合实践探索,正确选择机床,合理编制加工工艺及合理选择刀具等方法,有效地解决了技术难题。 相似文献
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随着科技的不断发展,发动机的类型不断增加,得到了更广泛的应用。汽车发动机的机体主要由气缸体、气缸盖、气缸垫以及曲轴箱组成,其中箱体零件的加工对发动机的安全运行非常重要,尤其是同轴孔加工,需要我们给予高度重视,不断加强相关研究,进一步完善箱体零件同轴孔加工工艺。文章中,首先对箱体结构、功用及箱体零件的加工原则等内容进行了阐述,然后进一步探讨了发动机箱体零件的同轴孔加工工艺,以供参考。 相似文献
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在装配直齿锥齿轮副时,经常出现齿面接触不良现象。齿轮零件和箱体的某些加工误差所引起的齿面接触不良,一般是无法通过装配调整得到改善的,例如:齿轮的齿向与其孔的轴线不共面,齿圈径向跳动过大或箱体上相互垂直的两轴承孔轴线不共面等等,都将会引起传动副的全部或部分肯面“吊角”接触,即齿的一面接触偏大端,另一面偏小端。此时只有依靠修刮齿面或对不合格零件进行返修来改善。但是在锥齿轮零件和箱体加工 相似文献
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济南一机床集团有限公司生产的该机为中等规格的高速卧式加工中心,适用于航天航空、汽车以及军工企业箱体类零件精密、高效加工。 相似文献
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纸箱空箱抗压强度计算是包装设计工程师的日常工作。本文介绍了抗压强度计算常用的凯里卡特公式;分步骤阐述了如何利用Office Excel办公软件,设计一套纸箱空箱抗压强度简易计算方法,并通过实例进行验证。结果表明利用Office Excel办公软件开发的简易计算方法与利用公式进行烦琐的手工计算方法的计算结果一致。 相似文献
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Willem van Jaarsveld Rommert Dekker 《International Journal of Production Economics》2011,133(1):423-431
In this paper obsolescence of service parts is analyzed in a practical environment. Based on the analysis, we propose a method that can be used to estimate the risk of obsolescence of service parts, which is subsequently used to enhance inventory control for those parts. The method distinguishes groups of service parts. For these groups, the risk of obsolescence is estimated using the behavior of similar groups of service parts in the past. The method uses demand data as main information source, and can therefore be applied without the use of an expert's opinion. We will give numerical values for the risk of obsolescence obtained with the method, and the effects of these values on inventory control will be examined. 相似文献
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Robert E. Schenk 《Real Estate Economics》1978,6(2):153-163
The purpose of this paper is to examine the prevalence and causes of vacant urban land. The paper is organized in four parts. The first part summarizes the available information on the extent of vacant urban land. The second section attempts to explain the existence of vacant land by using concepts often applied to labor unemployment. In part three that vacant land which the labor concepts do not explain is attacked with another tool from the economic tool box, the "optimal-harvest-time" solution, but this solution is found to have limited applicability. The paper concludes with a brief discussion of how the framework developed in parts two and three might be used.
Central in this paper is the attempt to analyze vacant land with theories developed for unemployed labor. This procedure stems from the belief that, whenever possible, new phenomena should be attacked with old theories. Such a methodology conserves effort, for if the old and new phenomena are indeed similar, new theories may not only be unnecessary but undesirable–product differentiation has a cost. Moreover, an old theory can bring out similarities that may not be obvious at first glance, and may suggest areas that deserve more attention. 相似文献
Central in this paper is the attempt to analyze vacant land with theories developed for unemployed labor. This procedure stems from the belief that, whenever possible, new phenomena should be attacked with old theories. Such a methodology conserves effort, for if the old and new phenomena are indeed similar, new theories may not only be unnecessary but undesirable–product differentiation has a cost. Moreover, an old theory can bring out similarities that may not be obvious at first glance, and may suggest areas that deserve more attention. 相似文献
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为了加速传统汽车企业的转型升级,提高汽车产品生产效率和生产质量,节约产品生产时间,根据作业要求,针对工业4.0智能工厂中的工件加工及尺寸检测工位,设计一款汽车发动机零件加工及搬运控制系统。以MES为基础,结合可编程控制器控制机器人、RFID、气动元件相关组件,搭建出工件加工及尺寸检测工位控制系统,对生产现场进行信息化管控,加工完成后,通过视觉检测系统对零件孔径进行检测。结果表明,控制系统运行稳定,能够顺利完成汽车零件的自动搬运与加工,所加工产品满足生产计划要求,产品合格率及生产效率得到大幅度提升,对制造企业的数字化改造具有一定的参考价值。 相似文献
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通过对单兵应急系统需求的分析,基于Android系统下的手持终端,针对实时音视频通信、GIS、指挥调度3个方面进行了深入研究分析,提出了一套单兵应急系统方案。该方案主要分为3个部分:1)依托于3G网络的实时音视频通信;2)实现支持离线矢量地图的地理信息系统,并实现指挥中心和手持终端协同标绘;3)单兵与中心相依相辅的应急资源管理、知识库查询和数据同步管理。 相似文献
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In many industrial sectors, firms are dealing with a demand which is more and more uncertain often due to the supply chain structure. One of the most critical effects of demand uncertainty is the simultaneous increase of inventories and decrease of customer service. This work describes an integrated system for managing inventories in a multi-echelon spare parts supply chain, in which customers of different size lay at the same level of the supply chain. The differences in size generate demand peaks and thus a very variable and lumpy demand pattern. The analysis presented in the paper stems from a case study in the field of durable goods spare parts. The paper contributes in three ways: on the one hand, it shows that consistency between managerial solutions and supply chain structure enables to enhance operative performances. On the other hand, it provides a new solution to a problem that characterises several different industrial contexts. Eventually, it highlights that the exploitation of a larger and more reliable set of information dramatically improves performance. 相似文献