Procedia CIRP最新文献_第5页

Experimental investigation on the surface and volume homogeneity of additive manufactured fused silica components in the Laser Glass Deposition process 激光玻璃沉积工艺中添加剂制造的熔融石英部件的表面和体积均匀性实验研究

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.116

引用次数: 0

CuNiSiCr alloy parametrization for defect-free DED-LB coating with conventional fibre laser 利用传统光纤激光器实现无缺陷 DED-LB 涂层的铜镍硅铬合金参数化

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.124

{"title":"CuNiSiCr alloy parametrization for defect-free DED-LB coating with conventional fibre laser","authors":"","doi":"10.1016/j.procir.2024.08.124","DOIUrl":"10.1016/j.procir.2024.08.124","url":null,"abstract":"<div><p>Copper alloys´ high thermal conductivity combined with the freeform capabilities of the additive manufacturing technologies, offer new opportunities in the design of aerospace components, such as thrust nozzles. However, the high reflectivity of copper alloys at the 1.076 µm wavelength range makes their manufacturing with conventional fibre lasers difficult. Therefore, an effective methodology for manufacturing CuNiSiCr-alloys with conventional fibre lasers is required.</p><p>For this purpose, the laser-based Directed Energy Deposition (DED-LB) process for depositing a CuNiSiCr-alloy is parametrized to ensure a defect-free operation of the final part. Through a design of experiments process, the optimum parameters are obtained and they are validated through the manufacturing of single clads and more complex geometries. During the tests, the melt-pool temperature and dimensions are monitored to increase the control over the manufacturing process and ensure process stability. Results show a high metallurgical integrity, which justifies the viability of fibre lasers to manufacture CuNiSiCr-alloys.</p></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212827124004785/pdf?md5=11ce1b593a1b99ff974d34fccdec2434&pid=1-s2.0-S2212827124004785-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of laser defocusing on duplex stainless steels for higher scan speeds in Laser-Based Powder Bed Fusion (PBF-LB/M) 在激光粉末床熔融（PBF-LB/M）中提高扫描速度时激光散焦对双相不锈钢的影响

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.095

引用次数: 0

Localized defect frequencies for Laser Metal Deposition processes 激光金属沉积工艺的局部缺陷频率

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.128

{"title":"Localized defect frequencies for Laser Metal Deposition processes","authors":"","doi":"10.1016/j.procir.2024.08.128","DOIUrl":"10.1016/j.procir.2024.08.128","url":null,"abstract":"<div><p>Laser Metal Deposition (LMD) uses laser energy and powder material to create structures on existing components. It is capable of producing cost-effective multi-material compositions, such as reinforcing metals with ceramic particles for improved wear resistance. However, the use of dissimilar materials often leads to defects, particularly delamination. Previous studies have found a connection between these defects and specific airborne acoustic emissions (AE).</p><p>To mitigate the impact of defects, extensive optimization of process parameters and real-time process monitoring are recommended. For AE, precise localization of defects is crucial besides to time- and frequency-resolved information, especially while producing multiple components on a substrate material.</p><p>This study evaluates multi-sensor arrays for the localization of delamination defects. The research investigates the influence of localization algorithms and array patterns on the accuracy and reliability of defect localization. Experiments were conducted on a test platform with simulated acoustical events to determine the most suitable localization setup.</p></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212827124004827/pdf?md5=97d382e9e8e7d8625dc9b321451c87d2&pid=1-s2.0-S2212827124004827-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative analysis of spatter formation in Laser Powder Bed Fusion: unraveling the impact of beam shaping and multi-beam processing 激光粉末床融合中飞溅物形成的定量分析：揭示光束整形和多光束加工的影响

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.136

引用次数: 0

Optical strain measurements during pulsed laser beam welding to improve the understanding of hot crack formation of EN AW-6082 aluminum alloy 脉冲激光束焊接过程中的光学应变测量，以加深对 EN AW-6082 铝合金热裂纹形成的理解

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.151

{"title":"Optical strain measurements during pulsed laser beam welding to improve the understanding of hot crack formation of EN AW-6082 aluminum alloy","authors":"","doi":"10.1016/j.procir.2024.08.151","DOIUrl":"10.1016/j.procir.2024.08.151","url":null,"abstract":"<div><p>E-mobility turned in the last years to be an emerging market and one solution to fossil fuel free mobility for the future. E-mobility requires, compared to fossil-fueled mobility concepts, a huge amount of welding tasks, which have to guarantee different functionality, as for example high strength, ductility, but also low resistivity and tightness. Last is especially for housing or cases of aluminum in automotive challenging, as pores and cracks can occur. Pulsed laser welding presents, due to the adaptable heat input and the temporal modification of stress state and solidification conditions advantages for this type of applications. EN AW-6xxx group of aluminum alloys is mainly used for such components due to their favorable mechanical properties. However, these alloys are susceptible to hot cracking during solidification from the molten phase. This article aims to present a methodology for demonstrating the resulting strain during pulsed laser beam welding of hot crack susceptible aluminum alloys. It will highlight the influence of factors such as pulse shape, shielding gas, and flow rate on strain and strain rate.</p></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212827124005055/pdf?md5=6d96b790c667ab1dfa01211dca2ac042&pid=1-s2.0-S2212827124005055-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Melt flow complexity in multi-spot laser welding of asymmetric T-joints 不对称 T 形接头多点激光焊接中的熔体流动复杂性

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.08.102

引用次数: 0

Automatic diagnosis and thickness determination for white etching layers in deep drilled steels based on thresholding and machine learning algorithms 基于阈值和机器学习算法的深钻钢中白色蚀刻层的自动诊断和厚度测定

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.05.008

Simon Strodick , Robert Schmidt , Andreas Zabel , Dirk Biermann , Frank Walther

{"title":"Automatic diagnosis and thickness determination for white etching layers in deep drilled steels based on thresholding and machine learning algorithms","authors":"Simon Strodick , Robert Schmidt , Andreas Zabel , Dirk Biermann , Frank Walther","doi":"10.1016/j.procir.2024.05.008","DOIUrl":"https://doi.org/10.1016/j.procir.2024.05.008","url":null,"abstract":"<div><p>The reliable detection and precise assessment of white etching layers (WEL) are key challenges in the investigation of a component’s surface integrity. This paper proposes an innovative methodology for evaluating the extent of WEL in quenched and tempered steels, machined by Boring and Trepanning Association (BTA) deep hole drilling. Micrographs obtained by light microscopy were partitioned into classes by three methods, separating the WEL from the base material and the embedding resin. Traditional manual segmentation was performed as a benchmark for automatic segmentation methods. A gray level thresholding-based method served for the segmentation of micrographs partitioned into subsets. In addition to conventional manual and thresholding-based segmentation, a machine learning-based approach for image segmentation was applied. The segmented images were further analyzed by a newly developed set of algorithms, implemented to obtain detailed information on the WEL, e.g. their average thickness as well as the area covered by WEL in the micrographs. Results indicate that both, gray level thresholding, as well as machine learning-based image segmentation, show potential for the automated diagnosis and assessment of WEL. They both yield quantitatively similar, but less biased results compared to manual segmentation.</p></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212827124002129/pdf?md5=0a3f744bb8aeb51dc6f2eeeb448716b9&pid=1-s2.0-S2212827124002129-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141328751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The influence of an ambient energetic field on precision cutting 环境能量场对精密切割的影响

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.05.010

Tjarden Zielinski , Oltmann Riemer

{"title":"The influence of an ambient energetic field on precision cutting","authors":"Tjarden Zielinski , Oltmann Riemer","doi":"10.1016/j.procir.2024.05.010","DOIUrl":"https://doi.org/10.1016/j.procir.2024.05.010","url":null,"abstract":"<div><p>Ultrasonic-assisted machining processes with diamond tools are regarded as a key technology for reducing the catastrophic tool wear occurring while machining steel workpieces with surface roughness in optical quality. Economical machining of various steel materials with significantly reduced wear of the diamond tool further improved since elliptical vibration cutting with a superimposed ultrasonic tool motion was introduced. How far the result of the machining process is influenced by the changing process kinematics of the ultrasonic motion alone or by the energy introduced into the material by the energy of an ambient ultrasonic field has not been investigated yet. The presented work is dedicated to superimposing an ultrasonic field into the workpiece during machining using an ultrasonic bath. Machining experiments with cutting grooves and particular surfaces with monocrystalline diamond tools are carried out on brass, copper and aluminum. The process forces show a decrease with the increase of the ultrasonic energy of up to 50 percent, while the surface roughness remains uninfluenced by the ultrasonic energy. The results indicate that the ultrasonic induced softening has an influence on the cutting process, which could improve the machining of brittle hard materials in future investigations.</p></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212827124002142/pdf?md5=b571f0031da033ebb9559df79c89de42&pid=1-s2.0-S2212827124002142-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141328753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machining Effect On The Surface Integrity And SE Of Additively Manufactured And Heat-Treated Nitinol 加工对添加制造和热处理镍钛诺表面完整性和 SE 的影响

Procedia CIRP Pub Date : 2024-01-01 DOI: 10.1016/j.procir.2024.05.011

Rachele Bertolini , Saeed Khademzadeh , Andrea Ghiotti , Stefania Bruschi

{"title":"Machining Effect On The Surface Integrity And SE Of Additively Manufactured And Heat-Treated Nitinol","authors":"Rachele Bertolini , Saeed Khademzadeh , Andrea Ghiotti , Stefania Bruschi","doi":"10.1016/j.procir.2024.05.011","DOIUrl":"https://doi.org/10.1016/j.procir.2024.05.011","url":null,"abstract":"<div><p>Nitinol belongs to the class of smart materials that have attracted the attention of researchers in recent decades due to their new promising industrial applications. Because of the austenite/martensite phase transformation, nitinol offers unique properties: superelasticity and shape memory effect. The former ability can be exploited for sensing, actuating, and damping applications. On the other hand, additive manufacturing of nitinol has started kicking off unimaginable applications exploiting the complexity-for-free characteristics offered by the 3D printing processes. Although stand-alone research on additive manufacturing of nitinol is available, the impact of different manufacturing steps, such as machining and heat treatment, on its superelasticity is severely lacking.</p><p>This work used a powder bed fusion process using a laser beam to manufacture a Ni<sub>50.4</sub>Ti<sub>49.6</sub> austenitic alloy, which was subsequently heat-treated at different aging temperatures. Subsequently, turning operations were carried out at varying cutting speeds under cryogenic cooling conditions. An in-depth characterization of the surface integrity and SE alterations induced by manufacturing was conducted before and after machining.</p><p>The outcome of the work provides the best combination of heat treatment and machining parameters that allow for maximum surface integrity and SE.</p></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212827124002154/pdf?md5=63be83816944b0f10ce7e464ff621f0b&pid=1-s2.0-S2212827124002154-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141328754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0