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首页> 外文期刊>International Journal of Machine Tools & Manufacture: Design, research and application >A novel selection method of scanning step for fabricating metal components based on micro-droplet deposition manufacture
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A novel selection method of scanning step for fabricating metal components based on micro-droplet deposition manufacture

机译：一种基于微滴沉积制造金属零件的扫描步骤的新选择方法

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Metal micro-droplet deposition manufacture technology has attracted wide interest for potential application in micro-structure fabrication. In order to fabricate functional metal components by sequentially depositing molten metal droplets on substrate layer by layer, the perfect overlapping and bonding strength among droplets have to be obtained. In this paper, the influence of scanning step on overlapping of droplets was investigated, and the critical overlapping condition of droplets was calculated by analyzing the relationship of the shape parameters of solidified droplet on the substrate. Four kinds overlapping states of adjacent droplets were predicted according to the change of scanning steps: no overlapping, partial overlapping, ideal overlapping and excessive overlapping. On this basis, two simple and effective models were proposed to calculate and predict the optimal scanning steps (W_(XP) and W_(YL)). The calculation results show that the W_(XP) and W_(YL) were only affected by droplet diameter (D) and solidification angle (θ). Based on this analysis, a pneumatic droplet generator was used to produce uniform molten Sn60-Pb40 alloy droplets with specific diameters (256 μm, 400 μm and 700 μm), and a series of deposition experiments were carried out with different scanning steps on the condition of fixed droplet temperature (270℃) and substrate temperature (90℃). The experimental results show that good overlapping and bonding strength of adjacent droplets could be obtained in deposited lines and layers, and low porosity and high density three-dimensional metal component was fabricated with optimized experimental parameters (W_(XP) and W_(YL)) according to theoretical models. The work can provide useful theoretical and experimental guide for metal micro-droplet deposition manufacture.
机译：金属微滴沉积制造技术吸引了广泛的兴趣，希望将其应用于微结构制造中。为了通过在基材上逐层依次沉积熔融金属液滴来制造功能性金属部件，必须获得液滴之间的完美的重叠和结合强度。本文研究了扫描步骤对液滴重叠的影响，并通过分析固化液滴在基板上的形状参数之间的关系，计算了液滴的临界重叠条件。根据扫描步骤的变化，预测了相邻液滴的四种重叠状态：无重叠，部分重叠，理想重叠和过度重叠。在此基础上，提出了两个简单有效的模型来计算和预测最佳扫描步骤（W_（XP）和W_（YL））。计算结果表明，W_（XP）和W_（YL）仅受液滴直径（D）和凝固角（θ）影响。基于此分析，使用气动液滴发生器产生具有特定直径（256μm，400μm和700μm）的均匀熔融Sn60-Pb40合金液滴，并在不同条件下进行了不同的扫描步骤的一系列沉积实验固定液滴温度（270℃）和基材温度（90℃）的关系。实验结果表明，在沉积线和沉积层中可以获得相邻液滴的良好重叠和结合强度，并通过优化的实验参数（W_（XP）和W_（YL））制备了低孔隙率和高密度的三维金属成分根据理论模型。这项工作可以为金属微滴沉积制造提供有用的理论和实验指导。

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