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理想材料零件的数字化设计制造方法及内涵 总被引:9,自引:1,他引:8
提出了理想材料零件的新概念 ,它是指按零件的最佳使用功能要求来设计 ,由呈梯度变化的组织成分和一定规律分布的细结构的材料与均质材料所组合构成的新型材料零件。提出并阐明了理想材料零件的数字化的并行设计制造 (简称数字化设计制造技术 )的方法和理论基础 ;它以材料与零件的一体化、集成化设计制造为主要特点 ,可根据零件功能要求进行零件的外部几何拓扑形状和内部材料组织细结构的并行设计 ,并采用增材制造和去材制造相结合的制造技术 ,按数字化设计的信息 ,一次完成零件内部组织结构和三维形体的制造。指出数字化设计制造将会使人们长期以来设想的按力学、电磁学性能来高效地设计制造新材料零件变为现实 ,在不远的将来定能像设计和建造房屋那样 ,按照所需功能设计制造理想材料零件。 相似文献
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理想材料零件的数字化设计制造方法及内涵 总被引:3,自引:0,他引:3
提出了理想材料零件的新概念,它是指按零件的最佳使用功能要求来设计,由呈梯度变化的组织成分和一定规律分布的细结构的材料与均质材料所组合构成的新型材料零件。提出并阐明了理想材料零件的数字化的并行设计制造(简称数字化设计制造技术)的方法和理论基础;它以材料与零件的一体化、集成化设计制造为主要特点,可根据零件功能要求进行零件的外部几何拓扑形状和内部材料组织细结构的并行设计,并采用增材制造和去材制造相结合的制造技术,按数字化设计的信息,一次完成零件内部组织结构和三维形体的制造。指出数字化设计制造将会使人们长期以来设想的按力学、电磁学性能来高效地设计制造新材料零件变为现实,在不远的将来定能像设计和建造房屋那样,按照所需功能设计制造理想材料零件。 相似文献
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基于工艺知识库的面向制造设计系统的研究 总被引:8,自引:0,他引:8
面向制造的设计是实现并行设计的关键技术。这里以零件的机械加工为例,研究了零件模型的建立,工艺知识的表示和组织,可制造性的分析和评价等关键技术,在CAD软件的平台上开发了基于工艺知识库的面向制造的原型设计系统,并通过基于知识的可制造性分析保证所设计零件的工艺性。 相似文献
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针对齿轮的研究 ,开发了基于并行设计的齿轮类零件 CAD/ CAPP集成系统 ,并把参数化设计与特征拼合设计结合起来 ,实现了结构设计与制造信息的集成 ,为齿轮设计和生产提供了一个高效、实用、准确、可靠的工具 ,并为机械类零件 CAD/ CAPP系统提供了基础 相似文献
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齿轮类零件CAD/CAPP集成系统的研究 总被引:7,自引:0,他引:7
针对齿轮的研究,开发了基于并行设计的齿轮类零件CAD/CAPP集成系统,并把参数化设计与特征拼合设计结合起来,实现了结构设计与制造信息的集成,为齿轮设计和生产提供了一个高效、实用、准确、可靠的工具,并为机械类零件CAD/CAPP系统提供了基础。 相似文献
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捞雷具水射流切割系统设计参数的选取对射流系统性能有很大影响,文中采用标准紊流模型,对轴对称淹没水射流撞击靶件的流场进行了数值模拟,分析了射流出口速度、射流出口角度等参数对射流冲击力的影响。数值模拟获得的计算结果较好地体现了淹没冲击射流流场的规律,为捞雷具射流切割系统设计参数的选取提供了依据,并可为相关射流系统的设计提供参考。 相似文献
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Kyung-Hyun Choi Khalid Rahman Arshad Khan Dong-Soo Kim 《Journal of Mechanical Science and Technology》2011,25(12):3053-3062
Electrohydrodynamic printing is a promising technique for printed electronics application. Most researchers working in this
field are using a single nozzle configuration. However, for large area printing a multi-nozzle setup will be required for
time and cost effective process. In this paper the influence of electric field and flow-rate on jetting angle on multi-nozzle
array has been investigated experimentally. A three nozzle setup has been used in a linear array by using glass capillary
as a nozzle with independent voltage applied on each nozzle and independent ink supply. The experiments are performed by changing
the nozzle to nozzle gap and the effect on the jetting angle has been investigated. It has been observed that by increasing
the applied voltage the jetting angle also increases at fixed flow-rate. In case of increasing the flow-rate, the jetting
angle first increases with increase in flow-rate, but as the flow-rate increases at certain level the jetting angle decreases;
moreover, at a high flow-rate the cone-jet length starts increasing. Numerical simulation has been performed to have a better
understanding of the electric-field with respect to jetting angles. The influence of one nozzle on another nozzle is also
investigated by operating the nozzle independently by using different operating cases. The cross-talk effect is also minimized
by reducing the nozzle diameter. At 250 μm nozzle diameter the cross-talk effect was negligible for 5 mm nozzle-to-nozzle
gap. This study will help in better understanding of the interaction between different nozzles in multi-nozzle cases and better
design of the multi-nozzle system by minimizing the effects of adjacent nozzles for multi-nozzle electrohydrodynamic printing
system. 相似文献
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Saeed Fathi Phill Dickens Richard Hague 《The International Journal of Advanced Manufacturing Technology》2012,59(1-4):201-212
This paper proposes a novel additive manufacturing concept which uses inkjet technology to manufacture parts in nylon 6. The methodology involved a series of experiments to investigate whether caprolactam, the monomer of nylon 6, could be jetted in the molten state. Once this was established, further experiments were undertaken to determine the possible boundaries for the process parameters. The main parameters were the vacuum level at which the melt could be controlled for stable jetting, the jetting voltage amplitude and frequency which were investigated against the jet array stability by monitoring the printhead’s nozzle plate. The jet(s) instability behaviour were characterised in different sets of experiments in order to optimise the jetting conditions for the molten caprolactam. The jetting voltage and vacuum level were found to have a significant effect whereas the jetting frequency did not. Instabilities occurred in the form of individual deviating jet trajectory and also jet array failures. These were found to be initiated by air motion when using inappropriate jetting voltage resulting in incorrect jet trajectory. A combination of incorrect jetting voltage and vacuum level led to air bubble entrapment during jetting and, therefore, rapid failure of the jets. Analysis of jet array instability led to a stable process window for further stages of the research on the additive inkjet manufacturing process development. 相似文献