共查询到20条相似文献,搜索用时 109 毫秒
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金属粉末热流道注射成型技术 总被引:1,自引:0,他引:1
介绍了金属粉末注射成型技术以及热流道系统在金属粉末注射成型技术中的应用,金属粉末注射成型模具的热流道喷嘴结构的选择,以及金属粉末注射成型模具材料的选择。 相似文献
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本文首先介绍了本次实验所采用的选择性激光烧结方法的原理,在此基础上,详细介绍了覆膜金属粉末的制备,并对金属注塑模具快速成型工艺及后处理实验技术进行了研究. 相似文献
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《锻压装备与制造技术》2015,(4)
<正>日前,中船重工第七○五研究所在3D打印技术领域取得重大突破,该所借助金属直接烧结快速成型技术(DMLS)进行3D打印,成为世界上第四家掌握直接金属烧结3D打印技术的企业。DMLS即直接金属激光烧结成型技术,是3D打印技术领域王冠上的明珠。该技术因为直接用激光熔融金属粉末沉积,金属本身是致密体重熔,不易产生粉末冶金那样的成形时的空穴,采用该技术生产的结构件致密度可达99%以上,接近锻造的材料胚体。目 相似文献
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激光熔覆快速成型致密金属零件的试验研究 总被引:10,自引:1,他引:9
激光熔覆成型能改善快速成型技术的基本工艺使之能够在快速,精确制造零件的同时提高零件的强度等力学性能,使快速成型技术突破目前多用来制造原型和模型的现状,直接生产高性能零件。本文对激光熔覆快速成型致密金属零件进行试验研究,介绍了试验装置的组成,通过单层和多层试验研究,获得了激光功率,扫描速度和光斑直径对激光熔覆成型的影响规律,获得了激光熔覆成型的金属零件。 相似文献
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Development of a welding system for 3D steel rapid prototyping process 总被引:10,自引:0,他引:10
0 IntroductionWeldingrapidprototypingisanovelproductionprocessinwhichasolidcomponentareformedbyweldingdepositionaccordingtoathree dimensionalCADmodel.Inthisprocess ,athree dimensional( 3D)objectisslicedbyCAD ,andcorrespondingoutlinecurvesofeachlayerareobta… 相似文献
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As a deposition technology, gas metal arc welding (GMAW) has shown new promise for rapid prototyping of metallic parts. During the process of metal forming using the arc of GMA W, low heat input and stable droplet transition are critical to high quality figuration. The effects of various processing parameters on figuration quality were studied in the experiment of GMA W rapid prototyping using the wire of ERSO-6 , including welding voltage, wire feeding rate, welding speed and so on. The optimal parameters for ERSO-6 are obtained. Simultaneously, it is verified that the rapid prototyping parts with favorable structures and quality can be achieved under the conditions of low heat input and stable droplet transition. 相似文献
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Inhaeng Cho Kunwoo Lee Woncheol Choi Yong-Ak Song 《International Journal of Machine Tools and Manufacture》2000,40(12)
Sheet deposition type rapid prototyping systems have many advantages: high build speed, low operating cost, large part size, no phase change, no need for support generation, etc. However, those sheet deposition type rapid prototyping systems generally require an additional post-processing step to remove excessive material. This post-processing step is generally time-consuming and labor-intensive as well. Especially, in case of parts with hollow cores and internal cavities, the removal of excessive materials can be an extremely demanding task.A new sheet deposition type rapid prototyping system that can minimize the post-processing is proposed. In the proposed system, the sheet is cut in two steps: the first before the shielding paper is peeled off and the second after peeling-off. The excessive area is removed during the peeling-off process after the first cutting. In this way, this system can reduce the post-processing time and cost as well as the limitation on the feasible geometric shapes compared to the conventional sheet deposition type systems. 相似文献
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介绍了快速成型技术的应用现状,对目前投入应用的几种典型快速成型工艺进行了述评与比较,指出了影响快速成型技术发展的因素,探讨了该技术的发展趋势. 相似文献
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对当前常用的RP工艺,如立体光刻、分层实体制造、熔融挤压成型、选区激光烧结等的原理、工艺和优缺点进行了简单评述,认为上述工艺均存在一些固有缺陷,距离企业的需求(如金属模具直接成型等)还有比较大的差距。在介绍激光诱导化学液相沉积(LCLD)技术的基础上,本文提出了一种基于该技术的新型快速成型方法,给出了其成型系统原理图,并详细介绍了系统的工作过程。分析表明,该种RP系统能够较好地弥补现有系统的不足之处,具有极其广阔的应用前景。 相似文献
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Sarat Singamneni Asimava RoychoudhuryOlaf Diegel Bin Huang 《Journal of Materials Processing Technology》2012,212(1):27-35
Fused deposition modeling (FDM), one of the rapid prototyping techniques is a promising technology for rapid manufacture of end use parts direct from CAD files and with the proliferation of cheaper machines, is likely to play a vital role in future polymer processing, challenging traditional processes such as injection moulding in some cases. Research evidence suggests that the road and layer structures would have significant influences on the mesostructure and consequent mechanical behaviour of the resulting polymer part. While adaptive slicing and other deposition schemes have been attempted for different reasons, it is believed that an appropriate deposition scheme is essential to ensure the best inter-road and interlayer connectivity, resulting in a continuous network of polymer chains, as in the case of the traditional processes. The current research proposes the curved layer deposition for FDM, in particular for thin shell-like parts, to ensure fibre continuity. Mathematical models are developed for curved slicing, implemented in a few case studies, parts are printed, and test results suggest marked improvement in the mechanical characteristics of curved layer parts. 相似文献