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Antibacterial effect of periodic structure formed on SUS430 by using nanosecond pulsed laser 利用纳秒脉冲激光在 SUS430 上形成的周期性结构的抗菌效果
IF 2.1 4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001196
Mikuru Okazaki, Masaki Hashida, Satoru Iwamori
We investigated the laser-induced periodic surface structures (LIPSSs) formed on an SUS430 surface by irradiation with a nanosecond pulsed laser (Nd:YAG, wavelength of 532 nm, pulse width of 10 ns, number of pulses of 50, repetition rate of 10 Hz, and laser fluence of 1.2 J/cm2) and the antibacterial effect of the surface. LIPSSs with an interspacing of about 500 nm, which was close to the laser wavelength, were produced on the surface when the pulsed laser was near the ablation threshold. The film attachment method (JIS Z 2801) was used to measure the bacterial growth suppression on SUS430 surfaces with and without LIPSSs. On the surface without an LIPSS, the number of colonies was 1244, and on that with an LIPSS, the number was 198, indicating that the LIPSS formed by nanosecond pulsed laser irradiation inhibited the growth of bacteria. The chrome oxide layer on the SUS430 surface with the LIPSS may emit chrome ions from the edge of the LIPSS, enhancing the antibacterial effect.
我们研究了用纳秒脉冲激光(Nd:YAG,波长 532 nm,脉宽 10 ns,脉冲数 50,重复频率 10 Hz,激光能量 1.2 J/cm2)照射 SUS430 表面所形成的激光诱导周期性表面结构(LIPSS)及其抗菌效果。当脉冲激光接近烧蚀阈值时,表面会产生间距约为 500 nm(接近激光波长)的 LIPSS。使用薄膜附着法(JIS Z 2801)测量了有 LIPSS 和没有 LIPSS 的 SUS430 表面的细菌生长抑制情况。在没有 LIPSS 的表面上,菌落数为 1244 个,而在有 LIPSS 的表面上,菌落数为 198 个,这表明纳秒脉冲激光照射形成的 LIPSS 抑制了细菌的生长。带有 LIPSS 的 SUS430 表面上的氧化铬层可能会从 LIPSS 边缘发射铬离子,从而增强抗菌效果。
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引用次数: 0
Automated quality evaluation for laser cutting in lithium metal battery production using an instance segmentation convolutional neural network 使用实例分割卷积神经网络自动评估锂金属电池生产中的激光切割质量
IF 2.1 4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001213
J. Kriegler, Tianran Liu, R. Hartl, Lucas Hille, M. F. Zaeh
Separating lithium metal foil into individual anodes is a critical process step in all-solid-state battery production. With the use of nanosecond-pulsed laser cutting, a characteristic quality-decisive cut edge geometry is formed depending on the chosen parameter set. This cut edge can be characterized by micrometer-scale imaging techniques such as confocal laser scanning microscopy. Currently, experimental determination of suitable process parameters is time-consuming and biased by the human measurement approach, while no methods for automated quality assurance are known. This study presents a deep-learning computer vision approach for geometry characterization of lithium foil laser cut edges. The convolutional neural network architecture Mask R-CNN was implemented and applied for categorizing confocal laser scanning microscopy images showing defective and successful cuts, achieving a classification precision of more than 95%. The algorithm was trained for automatic pixel-wise segmentation of the quality-relevant melt superelevation along the cut edge, reaching segmentation accuracies of up to 88%. Influence of the training data set size on the classification and segmentation accuracies was assessed confirming the algorithm’s industrial application potential due to the low number of 246 or fewer original images required. The segmentation masks were combined with topography data of cut edges to obtain quantitative metrics for the quality evaluation of lithium metal electrodes. The presented computer vision pipeline enables the integration of an automated image evaluation for quality inspection of lithium foil laser cutting, promoting industrial production of all-solid-state batteries with lithium metal anode.
将锂金属箔分离成单个阳极是全固态电池生产的关键工艺步骤。使用纳秒脉冲激光切割技术,可根据所选参数设置形成决定质量的切割边缘几何特征。这种切割边缘可通过微米级成像技术(如共焦激光扫描显微镜)进行表征。目前,通过实验确定合适的工艺参数非常耗时,而且人为测量方法存在偏差,而自动质量保证方法尚不得而知。本研究提出了一种用于锂箔激光切割边缘几何特征描述的深度学习计算机视觉方法。该方法采用了卷积神经网络架构 Mask R-CNN,并将其用于对显示缺陷和成功切割的共焦激光扫描显微镜图像进行分类,分类精度达到 95% 以上。对该算法进行了训练,以对切割边缘与质量相关的熔体超高进行像素级自动分割,分割准确率高达 88%。评估了训练数据集大小对分类和分割精确度的影响,证实该算法具有工业应用潜力,因为所需的原始图像数量较少,仅为 246 张或更少。分割掩模与切割边缘的地形数据相结合,获得了用于锂金属电极质量评估的量化指标。所介绍的计算机视觉流水线实现了锂箔激光切割质量检测的自动图像评估集成,促进了使用锂金属负极的全固态电池的工业化生产。
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引用次数: 0
Melt pool dynamics on different substrate materials in high-speed laser directed energy deposition process 高速激光定向能沉积过程中不同基底材料上的熔池动力学
IF 2.1 4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001145
Zefeng Wu, P. O’Toole, C. Hagenlocher, M. Qian, Milan Brandt, Jarrod Watts
High-speed laser directed energy deposition (HSL-DED) is a variant of the laser directed energy deposition process where a defocused metal powder stream is used, and it typically involves processing speeds exceeding 5 m/min. However, the interactions between the laser beam, powder stream, and substrate surface in HSL-DED have not been extensively studied. This study used a specialized XIRIS XVC-1000 welding camera with a narrow bandpass filter to record the interaction phenomenon. These observations were first carried out without powder delivery, using laser surface melting techniques, and involved processing speeds of up to 20 m/min and laser powers of up to 3 kW. HSL-DED with powder delivery was then conducted with the same parameter combinations for comparative analysis. The in situ observations in laser surface melting and HSL-DED identified a physical separation between the laser spot and the melt pool boundary, referred to as melt pool lag. Different substrates’ chemical compositions and the resulting thermophysical properties significantly impact melt pool dynamics during the high-speed laser-material interactions for a given process condition. The findings from this work have enabled a better understanding and control of melt pool dynamics in HSL-DED.
高速激光定向能沉积(HSL-DED)是激光定向能沉积工艺的一种变体,它使用的是散焦金属粉末流,加工速度通常超过 5 米/分钟。然而,对 HSL-DED 中激光束、粉末流和基底表面之间的相互作用尚未进行广泛研究。本研究使用带有窄带通滤波器的专用 XIRIS XVC-1000 焊接相机来记录相互作用现象。这些观察首先是在没有粉末输送的情况下进行的,使用的是激光表面熔化技术,加工速度高达 20 米/分钟,激光功率高达 3 千瓦。然后使用相同的参数组合进行了带粉末输送的 HSL-DED 对比分析。对激光表面熔化和 HSL-DED 的现场观察发现,激光光斑和熔池边界之间存在物理分离,即熔池滞后。在给定的工艺条件下,不同基材的化学成分和由此产生的热物理性质会对高速激光与材料相互作用过程中的熔池动态产生显著影响。这项工作的发现有助于更好地理解和控制 HSL-DED 中的熔池动力学。
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引用次数: 0
Process development and process adaption guidelines for the deposition of thin-walled structures with IN718 using extreme high-speed directed energy deposition (EHLA3D) 使用超高速定向能沉积(EHLA3D)沉积IN718薄壁结构的工艺开发和工艺适应指南
4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001140
Min-Uh Ko, Zongwei Zhang, Thomas Schopphoven
Extreme high-speed directed energy deposition (EHLA) is a modified variant of the laser based directed energy deposition (DED-LB) and is being applied as an efficient coating process for rotational symmetric components. Characteristics of EHLA processes are feed rates of up to 200 m/min, which result in smaller weld bead deposition and thinner layer thicknesses compared to conventional DED-LB. When transferred to additive manufacturing, this characteristic utilizes the potential of depositing thin-walled filigree structures at deposition rates, which are comparable to typical DED-LB processes (EHLA3D). The results of this work were achieved with an EHLA3D machine, which is a modified CNC-type machine capable of operating feed rates with vf = 30 m/min. In this work, process parameters were developed for the deposition of thin-walled filigree structures with the Ni-based superalloy IN718. Single tracks with constant feed rates and a variation in the beam diameter and powder mass flow were deposited and analyzed regarding the resulting weld bead dimension and dilution zone. Then, process parameters were selected and transferred to the deposition of thin walls, and guidelines of the parameter adaption toward thin-walled deposition were defined. Two parameter sets were developed to assess the feasible wall-thicknesses deposited by EHLA3D. Depending on the developed parameter sets, wall thicknesses between 300 and 500 μm are achieved. To characterize the resulting thin-walls, surface roughness measurements and metallographic cross sections were conducted.
超高速定向能沉积(EHLA)是激光定向能沉积(ed - lb)的改进版本,是一种用于旋转对称部件的高效涂层工艺。EHLA工艺的特点是进料速度高达200米/分钟,与传统的d - lb相比,这导致焊缝沉积更小,层厚度更薄。当转移到增材制造时,该特性利用了以沉积速率沉积薄壁细丝结构的潜力,这与典型的d - lb工艺(EHLA3D)相当。这项工作的结果是通过EHLA3D机器实现的,这是一种改进的cnc型机器,能够运行vf = 30 m/min的进给速度。本文研究了用镍基高温合金IN718沉积薄壁丝状组织的工艺参数。在恒定的进给速率下,沉积了单轨迹,并分析了光束直径和粉末质量流量的变化,以及由此产生的焊缝尺寸和稀释区。然后,选择工艺参数并将其转移到薄壁沉积中,并定义了薄壁沉积参数的适应准则。开发了两个参数集来评估EHLA3D沉积的可行壁厚。根据开发的参数集,可以实现300至500 μm之间的壁厚。为了表征所得到的薄壁,进行了表面粗糙度测量和金相截面。
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引用次数: 0
Modeling and multiobjective optimization of thermal effects of fiber laser cutting of Inconel 600 sheet by employing the ANN and multi-objective PSO algorithm 基于神经网络和多目标粒子群算法的光纤激光切割Inconel 600板材热效应建模与多目标优化
4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001231
Mohammad Hossein Razavi Dehkordi, Dheyaa J. Jasim, Ameer H. Al-Rubaye, Mohammad Akbari, Seyed Amin Bagherzadeh, Mohammadreza Ghazi, Hamed Mohammadkarimi
In this study, the experimental results of fiber laser cutting of Inconel 600 was modeled and optimized by combining artificial neural networks (ANNs) and particle swarm optimization (PSO). The impact of cutting criteria on the temperature adjacent to the cut kerf and roughness of the cutting edge was experimentally evaluated. The independent variables are the cutting speed, focal length, and laser power. The fiber laser cutting characteristics are modeled at different cutting conditions by the ANN method according to the experimental data. The findings indicated that the ANN is performing reasonably well in dealing with the training and test datasets. Also, the multiobjective PSO has been developed to effectively optimize the laser cutting procedure parameters in order to achieve the maximum temperature (the temperature upper than 370 °C) and minimum roughness (lower than 3 μm) simultaneously in order to improve the laser cutting efficiency. Based on the PSO results, the optimal laser power gained at a laser power of 830 and 1080 W at cutting speed ranges from 2 to 4 m/min and maximum focal length ranges between 0.75 and 0.8 mm where the lowest amount of roughness was created. The optimum temperature ranges were between 370 and 419°C. At a laser power of 1000 W and speed of 4 m/min, the smooth cutting edge at minimum roughness was gained without any defects. Transmission of the focal point up to 1.5 mm below the top surface of the sheet improved the roughness of the cutting edge and the cut quality by producing the smooth surface without slags.
本研究采用人工神经网络(ann)和粒子群优化(PSO)相结合的方法对光纤激光切割Inconel 600的实验结果进行建模和优化。实验评价了切削准则对切削刃附近温度和切削刃粗糙度的影响。自变量是切割速度、焦距和激光功率。根据实验数据,采用神经网络方法对不同切割条件下的光纤激光切割特性进行了建模。结果表明,人工神经网络在处理训练和测试数据集方面表现相当好。同时,开发了多目标粒子群算法,有效地优化了激光切割工艺参数,以同时实现最高温度(高于370°C)和最小粗糙度(低于3 μm),从而提高激光切割效率。基于PSO结果,激光功率为830和1080 W,切割速度为2 ~ 4 m/min,最大焦距为0.75 ~ 0.8 mm时,产生的粗糙度最小。最佳温度范围为370 ~ 419℃。在激光功率为1000 W,速度为4 m/min的条件下,获得了粗糙度最小的光滑刃口,没有任何缺陷。焦点传输到板材顶面以下1.5 mm处,通过产生无渣的光滑表面,提高了切割边缘的粗糙度和切割质量。
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引用次数: 0
Investigation of influence of oscillation amplitude on keyhole and molten pool morphologies during oscillating laser stake welding of dissimilar materials T-joints 研究振荡振幅对异种材料 T 型接头振荡激光桩焊接过程中锁孔和熔池形态的影响
IF 2.1 4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001132
Yuewei Ai, Jiabao Liu, Shibo Han
The morphologies of the keyhole and molten pool during the laser welding process are highly related to weld formation process, which affects the weld quality further. To investigate the influence of the oscillation amplitude on the morphology evolution processes of the keyhole and molten pool during the oscillating laser stake welding of dissimilar materials T-joints, a three-dimensional multiphase flow numerical model is developed. The circular shaped oscillating laser stake welding processes of dissimilar materials T-joints under different oscillation amplitudes are calculated and analyzed in detail. The results show that the depth of the keyhole decreases and the widths of the molten pool and weld at the interface increase with the increase in the oscillation amplitude during the circular shaped oscillating laser stake welding of dissimilar materials T-joints. The periodical expansion and contraction of the keyhole are formed during the welding process. The collapse of the keyhole may cause bubbles in the molten pool due to the instability of the keyhole, and these bubbles also can be captured by the keyhole later.
激光焊接过程中的锁孔和熔池形态与焊缝成形过程密切相关,并进一步影响焊缝质量。为了研究振荡振幅对异种材料 T 型接头振荡激光桩焊接过程中键孔和熔池形态演变过程的影响,建立了一个三维多相流数值模型。详细计算并分析了不同振幅下异种材料 T 型接头的圆形振荡激光桩焊接过程。结果表明,在异种材料 T 型接头的圆弧形振荡激光桩焊接过程中,随着振荡振幅的增大,键孔深度减小,熔池宽度和界面焊缝宽度增大。焊接过程中会形成键孔的周期性膨胀和收缩。由于键孔的不稳定性,键孔的塌陷可能会在熔池中产生气泡,这些气泡随后也会被键孔捕获。
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引用次数: 0
Monitoring the degree of dilution during directed energy deposition of aluminum bronze and H13 tool steel using optical emission spectroscopy 利用发射光谱法监测铝青铜和H13工具钢定向能沉积过程中的稀释程度
4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001081
Malte Schmidt, Knut Partes, Rohan Rajput, Giorgi Phochkhua, Henry Köhler
Controlling heat transfer in casting tools is a key quality aspect. It can be improved by selectively applying volumetric aluminum bronze (CuAl9.5Fe1.2) sections in the core of the tools and subsequently depositing these cores with hard-facing H13 tool steel. Directed energy deposition (DED) can be used for both additive manufacturing of aluminum bronze and hard-facing by depositing the filler material onto a substrate surface or previously manufactured bodies. A sufficient metallurgical bonding of the deposited filler material and the underlying layer must be ensured. Hence, the dilution is a key factor for quality assurance. However, high dilution of the underlying layer and the filler material negatively affects the desired properties and must be monitored. Optical emission spectroscopy of the DED process emissions is investigated by comparing the emission lines of the individual elements comprising the base and the filler materials. Multiple single tracks using aluminum bronze as the filler material are laser-cladded with varying power, onto the two different types of substrates, i.e., mild steel S355 (1.0570) and hot working tool steel H11 (1.2343). Additionally, single tracks of H13 (1.2344) are deposited with varying laser powers onto an additively manufactured core of aluminum bronze. Both resulting in deposition tracks with varying dilution values. Multiple emission lines of Cr, Fe, Cu, Al, and Mn are detected and measured (line intensity). Line intensity ratios using the element emission lines are calculated and correlated with the respective metallographic results of the deposition tracks (dilution and chemical composition). Deposition tracks with a higher dilution (CuAl9.5Fe1.2 onto S355/H11 as well as H13 onto CuAl9.5Fe1.2) showed an increased line intensity ratio of the underlying material to the filler material. Moreover, this technology was transferred in a multilayer industrial application.
控制铸造工具的热传递是一个关键的质量方面。可以通过选择性地在刀具芯中应用体积铝青铜(CuAl9.5Fe1.2)截面,然后在这些芯中沉积硬面H13工具钢来改进。定向能沉积(DED)既可以用于铝青铜的增材制造,也可以通过将填充材料沉积在衬底表面或先前制造的主体上来进行硬堆焊。必须确保沉积的填充材料和下垫层之间有充分的冶金结合。因此,稀释是质量保证的关键因素。然而,底层和填充材料的高度稀释会对期望的性能产生负面影响,必须加以监测。通过比较构成基底和填充材料的各个元素的发射谱线,研究了DED过程发射的光学发射光谱。使用铝青铜作为填充材料的多个单轨以不同的功率激光熔覆在两种不同类型的基材上,即低碳钢S355(1.0570)和热加工工具钢H11(1.2343)。此外,用不同的激光功率将H13(1.2344)的单径迹沉积在铝青铜的增材制造核心上。两者都导致不同稀释值的沉积轨迹。检测和测量了Cr, Fe, Cu, Al和Mn的多个发射线(线强度)。利用元素发射谱线计算谱线强度比,并与沉积轨迹(稀释和化学成分)的各自金相结果相关联。稀释度较高的沉积轨迹(CuAl9.5Fe1.2到S355/H11上,以及H13到CuAl9.5Fe1.2上)表明,衬底材料与填充材料的线强度比增加。此外,该技术还被转移到多层工业应用中。
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引用次数: 0
Surface wettability patterning of metal additive manufactured parts via laser-assisted functionalization 激光辅助功能化金属增材制造零件的表面润湿性图案化
4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001143
Wuji Huang, Ben Nelson, Hongtao Ding
Additive manufacturing (AM) has revolutionized the production of complex geometries with superior properties compared with traditional manufacturing methods. However, the high roughness and poor wettability of as-produced surfaces of AM parts limit their suitability for certain applications. To address this, we present a maskless laser-assisted surface functionalization method to improve the wettability of metal 3D printed parts. This study explores the potential of combining metal AM with surface wettability patterning, a promising technique in fluid-related fields. Large-area AlSi10Mg parts were fabricated using laser powder bed fusion (L-PBF), followed by an innovative laser-assisted functionalization (LAF) method to achieve patterned wetting surfaces. The LAF method consists of laser texturing and chemical modification steps, and two strategies were demonstrated to fabricate different types of wettability patterns. Strategy I helps produce two types of superhydrophobicity, while strategy II helps create a superhydrophobic-superhydrophilic patterned surface. The study demonstrates the simplicity, robustness, and feasibility of the process and analyzes the processing mechanism, surface topography, and surface chemistry. The integration of surface wettability patterning and 3D-printing can optimize components to enhance performance and efficiency by creating intricate fluid flow pathways. Overall, this work highlights the potential of combining metal AM with surface wettability patterning, providing a pathway to produce high-performance parts with tailored wettability properties. This research has significant implications for fluid-related industries such as aerospace, automotive, and energy, as it offers unparalleled design freedom and the ability to create complex geometries.
与传统制造方法相比,增材制造(AM)已经彻底改变了具有优越性能的复杂几何形状的生产。然而,增材制造零件表面的高粗糙度和较差的润湿性限制了它们在某些应用中的适用性。为了解决这个问题,我们提出了一种无掩模激光辅助表面功能化方法,以提高金属3D打印部件的润湿性。本研究探索了金属增材制造与表面润湿性图案相结合的潜力,这是一种在流体相关领域中很有前途的技术。采用激光粉末床熔融(L-PBF)制造大面积AlSi10Mg零件,然后采用创新的激光辅助功能化(LAF)方法实现图案化润湿表面。LAF方法由激光织构和化学修饰步骤组成,并演示了两种策略来制作不同类型的润湿性图案。策略I有助于产生两种超疏水性,而策略II有助于产生超疏-超亲水性图案表面。该研究证明了该工艺的简单性、稳健性和可行性,并分析了加工机理、表面形貌和表面化学。表面润湿性图案和3d打印的集成可以优化组件,通过创建复杂的流体流动路径来提高性能和效率。总的来说,这项工作突出了将金属增材制造与表面润湿性图案相结合的潜力,为生产具有定制润湿性的高性能部件提供了途径。这项研究对航空航天、汽车和能源等流体相关行业具有重要意义,因为它提供了无与伦比的设计自由度和创建复杂几何形状的能力。
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引用次数: 0
Development and assessment of a methodology for abstraction of topology optimization results to enable the substitution of optimized beams 开发和评估拓扑优化结果的抽象方法,以实现优化梁的替代
4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001185
Tim Röver, Maximilian Bader, Karim Asami, Claus Emmelmann, Ingomar Kelbassa
Improving mechanical topology optimization (TO) results by substituting biomimetic beams is one possibility to achieve designs of mechanical components that are highly sustainable and show good mechanical performance. Because of their geometric complexity, such designs were found to be well-suited for production by laser additive manufacturing. One obstacle of incorporating biomimetics beams in TO designs is the lack of detailed design methodologies. Röver et al. [“Methodology for integrating biomimetic beams in abstracted topology optimization results,” in Proceedings of the ASME 2022 International Mechanical Engineering Congress and Exposition. Volume 4: Biomedical and Biotechnology; Design, Systems, and Complexity Columbus, OH, 30 October–3 November (ASME, New York, 2022)] proposed a corresponding design concept. Building on their concept, we present in this work a detailed methodology for abstraction of TO results to a design consisting of ball nodes and cylindrical beams. Using such an auxiliary design, the internal forces and moments of the beams can be evaluated to allow for the substitution of suitable biomimetic beams to generate biomimetic component designs in a next step. We present a skeletonization algorithm based on the potential field approach. Using the skeletonization and an additional analysis of the dimensions of the beams in the TO result, the algorithm develops an auxiliary design of the original TO result. The final algorithm was applied to three common TO results to obtain one auxiliary component design each. The developed algorithm was found to generate abstractions that were well-suited for use in the methodology proposed in Röver et al. [“Methodology for integrating biomimetic beams in abstracted topology optimization results,” in Proceedings of the ASME 2022 International Mechanical Engineering Congress and Exposition. Volume 4: Biomedical and Biotechnology; Design, Systems, and Complexity Columbus, OH, 30 October–3 November (ASME, New York, 2022)], because internal forces and moments in the abstracted beams could be evaluated with less effort. Therefore, our work contributes to a detailed design methodology for biomimetic mechanical components in the field of design for additive manufacturing.
采用仿生梁替代机械拓扑优化是实现高可持续性和良好力学性能的机械部件设计的一种可能。由于其几何复杂性,这种设计被发现非常适合激光增材制造的生产。将仿生光束纳入TO设计的一个障碍是缺乏详细的设计方法。Röver等人。[“在抽象拓扑优化结果中集成仿生梁的方法”,ASME 2022国际机械工程大会和博览会论文集。]第4卷:生物医学和生物技术;设计,系统和复杂性哥伦布,俄亥俄州,10月30日至11月3日(ASME,纽约,2022)]提出了相应的设计概念。基于他们的概念,我们在这项工作中提出了一种详细的方法,将TO结果抽象为由球节点和圆柱形梁组成的设计。使用这样的辅助设计,可以评估梁的内力和力矩,以便在下一步中替换合适的仿生梁来生成仿生组件设计。提出了一种基于势场法的骨架化算法。利用骨胳化和对TO结果中梁的尺寸的附加分析,该算法对原始TO结果进行了辅助设计。将最后的算法应用于三个常见的to结果,分别得到一个辅助元件设计。开发的算法被发现可以生成非常适合在Röver等人提出的方法中使用的抽象。[“在抽象拓扑优化结果中集成仿生梁的方法”,ASME 2022国际机械工程大会和博览会论文集。第4卷:生物医学和生物技术;设计,系统和复杂性哥伦布,俄亥俄州,10月30日至11月3日(ASME,纽约,2022)],因为抽象梁的内力和力矩可以更轻松地评估。因此,我们的工作有助于为增材制造设计领域的仿生机械部件提供详细的设计方法。
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引用次数: 0
High speed laser cutting of ultrathin metal foils for battery cell production 电芯生产用超薄金属箔的高速激光切割
4区 工程技术 Q2 Physics and Astronomy Pub Date : 2023-11-01 DOI: 10.2351/7.0001091
Alessandro Ascari, Caterina Angeloni, Erica Liverani, Alessandro Fortunato
Laser-based manufacturing has become a key enabling technology in the production of batteries and battery cells for the e-mobility field. Several applications, in fact, have already been industrialized, such as laser-based welding, cutting, stripping, and cleaning. Among all those technologies, laser cutting, in particular, has to deal with several very stringent constraints: the presence of highly reflective materials (aluminum and copper), very low thicknesses (6–12 μm), on-the-fly processing, and high quality of the cutting surface. According to those considerations, the present paper deals with the application of remote cutting of 12 μm thick aluminum and 6 μm thick copper foils by means of a galvo scanner and two different fiber laser sources: single mode constant wave and nanosecond pulsed wave ones. The experimental activity is devoted to understanding the feasibility of the process and to point out the pros and cons of the two different lasers involved. The cutting edges are analyzed by means of optical and SEM microscopy, in order to characterize cutting quality. The process is also characterized in terms of maximum achievable speed in order to understand the limits of both lasers and galvo scanning systems.
激光制造已成为电动汽车领域电池和电池单元生产的关键使能技术。事实上,一些应用已经工业化了,比如基于激光的焊接、切割、剥离和清洁。在所有这些技术中,特别是激光切割,必须处理几个非常严格的限制:高反射材料(铝和铜)的存在,非常低的厚度(6-12 μm),实时加工,以及切割表面的高质量。在此基础上,本文研究了利用电振扫描仪和单模恒定波和纳秒脉冲波两种不同光纤激光源对12 μm厚铝箔和6 μm厚铜箔进行远程切割的应用。实验活动致力于了解该过程的可行性,并指出两种不同激光器的优缺点。利用光学显微镜和扫描电镜对切削刃进行了分析,以表征切削质量。该过程还具有最大可实现速度方面的特征,以便了解激光和galvo扫描系统的限制。
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引用次数: 0
期刊
Journal of Laser Applications
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