共查询到19条相似文献,搜索用时 62 毫秒
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无掩模定域性电化学沉积-增材制造技术是采用电化学沉积原理、摈除掩模与支撑、以增材制造方式实现三维金属微结构制造的一种新技术。本文综述了体现该技术核心内容与工艺特征的代表性技术:介绍了无掩模定域性喷射电化学沉积-增材制造技术和无掩模定域性直写电化学沉积-增材制造技术的基本原理和研究现状,分析了2种技术各自的特点、存在的问题和今后的研究发展趋势。 相似文献
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选区电沉积是基于增材制造理念所发展出的一种新型制备技术,其优势在于能够在工件表面局部区域进行定点、定形地沉积金属材料。主要介绍了选区电沉积技术的主要类型,论述该技术的原理与特点,总结其发展和研究现状,指出了选区电沉积技术的现有不足及发展趋势。 相似文献
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采用双脉冲MIG电弧增材制造工艺制备了ER5356铝合金直壁和斜壁试件.通过多组单道单层试验,探索了双脉冲铝合金电弧增材的最佳工艺.结果 表明,采用130A电流,20V电弧电压,7mm/s焊接速度,4Hz低频频率进行ER5356铝合金直壁件增材制造,成型质量良好,其晶粒在高度方向呈现等轴晶与柱状晶交替分布,硬度也呈周期... 相似文献
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针对TIG电弧增材制造过程中焊件与基板变形累积的问题,提出了水浴PTIG微变形电弧增材工艺.阐述了水浴PTIG电弧增材工艺的原理和系统组成,对比了水浴和空冷两种工艺条件下增材制造的熔敷速率、基板变形和成形质量.结果表明,水浴条件下的有效熔敷速率稳定在144 g/h,是空冷条件下的2.7倍.水浴条件下基板平面度为2.114,较空冷时降低24%.水浴对直壁体的高度方向成形精度影响较大,对宽度方向影响甚微,水浴时直壁成形件的高度标准差为2.6 mm,低于空冷(3.1 mm),宽度方向均为0.3 mm. 相似文献
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D. MacDonald R. Fernández F. Delloro B. Jodoin 《Journal of Thermal Spray Technology》2017,26(4):598-609
Titanium parts are ideally suited for aerospace applications due to their unique combination of high specific strength and excellent corrosion resistance. However, titanium as bulk material is expensive and challenging/costly to machine. Production of complex titanium parts through additive manufacturing looks promising, but there are still many barriers to overcome before reaching mainstream commercialization. The cold gas dynamic spraying process offers the potential for additive manufacturing of large titanium parts due to its reduced reactive environment, its simplicity to operate, and the high deposition rates it offers. A few challenges are to be addressed before the additive manufacturing potential of titanium by cold gas dynamic spraying can be reached. In particular, it is known that titanium is easy to deposit by cold gas dynamic spraying, but the deposits produced are usually porous when nitrogen is used as the carrier gas. In this work, a method to manufacture low-porosity titanium components at high deposition efficiencies is revealed. The components are produced by combining low-pressure cold spray using nitrogen as the carrier gas with low-cost titanium powder produced using the Armstrong process. The microstructure and mechanical properties of additive manufactured titanium components are investigated. 相似文献
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Accurate prediction of electrode shapes is most important in electrochemical manufacturing process which includes electrochemical machining and electroforming. In the former process, the electrode design is focused on the prediction of the cathode tool which significantly affects the machining accuracy. In the electroforming process, the anode electrode shape determines the current density distribution and so the properties of the deposited metal. This paper proposes a finite element approach to accurately determine these electrode profiles. The proposed method does not require Iterative redesign process, therefore provides excellent convergence and efficient computing. Close agreements between theoretical and experimental results have been observed. 相似文献
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增材制造路径对于成型质量、打印效率等具有重要影响。针对由多重因素造成的增材制造路径选择困难等问题,提出基于层次分析法的增材制造路径选择方法。通过调研得到17个主要评价指标,剔除耦合指标后归类为6大子指标,构建增材制造路径评价指标体系;以成型性能、开发性能、应用性能为主要指标,以常见的6种增材制造路径为备选方案,构建具有双层指标的增材制造路径选择层次模型,应用层次分析法相对权数计算的层位传递原理,对路径选择的多层判断矩阵进行一致性检验,确定备选增材制造路径方案总排序。分析结果显示分形路径综合性能最佳。 相似文献
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西马克集团增材制造研发中心,将增材制造产业的整个价值链作为研究方向,其研发制造的雾化粉末设备,可以生产高品质的金属粉末,具有成本低、效率高的优势。该设备集成了卫星粉防控技术,极大地降低了不合格粉末颗粒的含量,同时,通过对雾化过程进行CFD计算流体动力学仿真(以下简称CFD仿真),优化了紧耦合喷嘴的设计,提高了金属粉末的性能和收得率。 相似文献