{ "types" : { "Bookmark" : { "pluralLabel" : "Bookmarks" }, "Publication" : { "pluralLabel" : "Publications" }, "GoldStandardPublication" : { "pluralLabel" : "GoldStandardPublications" }, "GoldStandardBookmark" : { "pluralLabel" : "GoldStandardBookmarks" }, "Tag" : { "pluralLabel" : "Tags" }, "User" : { "pluralLabel" : "Users" }, "Group" : { "pluralLabel" : "Groups" }, "Sphere" : { "pluralLabel" : "Spheres" } }, "properties" : { "count" : { "valueType" : "number" }, "date" : { "valueType" : "date" }, "changeDate" : { "valueType" : "date" }, "url" : { "valueType" : "url" }, "id" : { "valueType" : "url" }, "tags" : { "valueType" : "item" }, "user" : { "valueType" : "item" } }, "items" : [ { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/208fa8354a72c899275b2bf667cd24bfe/manuelhenn", "tags" : [ "ablation","additivemanufacturing","macromaterialprocessing","micromaterialprocessing","myown","processdevelopment","pulse","selectivelasermeltingslm","ultrashort" ], "intraHash" : "08fa8354a72c899275b2bf667cd24bfe", "interHash" : "420dbfc085d8ab2f791c55ca474c62eb", "label" : "Exceeding the Limits in Laser Materials Processing by Bridging Additive and Subtractive Manufacturing with Continuous Wave and Ultrashort Pulsed Lasers - Manufacturing of Parts with Undercuts", "user" : "manuelhenn", "description" : "", "date" : "2024-05-14 16:33:35", "changeDate" : "2024-05-14 16:33:35", "count" : 5, "pub-type": "presentation", "year": "2024", "url": "https://www.spiedigitallibrary.org/profile/notfound?author=Manuel_Henn#_=_", "author": [ "Manuel Henn","Matthias Buser","Daniel Holder","Christian Hagenlocher","Thomas Graf" ], "authors": [ {"first" : "Manuel", "last" : "Henn"}, {"first" : "Matthias", "last" : "Buser"}, {"first" : "Daniel", "last" : "Holder"}, {"first" : "Christian", "last" : "Hagenlocher"}, {"first" : "Thomas", "last" : "Graf"} ], "abstract": "Laser-based powder bed fusion of metals faces limitations in accuracy, surface quality, and minimal structure size resulting from the inherent melting process. To address these challenges, a novel approach integrating additive and subtractive laser processes at the layer level has been developed. This quasi-simultaneous manufacturing process enables the fabrication of small structures with high aspect ratios, including narrow slits below 50 μm in width. The implications of this advancement are promising, particularly in the fields of electric drives and fuel cells, where accuracy and freedom of design are crucial. In this work, the latest results of the production of narrow, inclined slits in components made of pure iron will be shown. Characteristics like groove-to-groove distance and groove width were analyzed, achieving successful production of continuous slits with varying inclination angles of up to 30° within the manufactured components.", "eventtitle" : "LASE, Photonics West", "venue" : "San Francisco, California, United States", "bibtexKey": "henn2024exceeding" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/291178c3a81a4e3db11743469ccfe1caf/manuelhenn", "tags" : [ "Ablation","AdditiveManufacturing","MacroMaterialProcessing","MicroMaterialProcessing","ProcessDevelopment","SLM","SelectiveLaserMelting","UltrashortPulse","myown" ], "intraHash" : "91178c3a81a4e3db11743469ccfe1caf", "interHash" : "420dbfc085d8ab2f791c55ca474c62eb", "label" : "Exceeding the Limits in Laser Materials Processing by Bridging Additive and Subtractive Manufacturing with Continuous Wave and Ultrashort Pulsed Lasers - Manufacturing of Parts with Undercuts", "user" : "manuelhenn", "description" : "", "date" : "2024-05-07 23:03:16", "changeDate" : "2024-05-07 23:03:16", "count" : 5, "pub-type": "inproceedings", "booktitle": "Laser 3D Manufacturing XI","series": "Proc. SPIE","publisher":"SPIE", "year": "2024", "url": "https://doi.org/10.1117/12.3003688", "author": [ "Manuel Henn","Matthias Buser","Daniel Holder","Christian Hagenlocher","Thomas Graf" ], "authors": [ {"first" : "Manuel", "last" : "Henn"}, {"first" : "Matthias", "last" : "Buser"}, {"first" : "Daniel", "last" : "Holder"}, {"first" : "Christian", "last" : "Hagenlocher"}, {"first" : "Thomas", "last" : "Graf"} ], "volume": "12876","abstract": "Laser-based powder bed fusion of metals faces limitations in accuracy, surface quality, and minimal structure size resulting from the inherent melting process. To address these challenges, a novel approach integrating additive and subtractive laser processes at the layer level has been developed. This quasi-simultaneous manufacturing process enables the fabrication of small structures with high aspect ratios, including narrow slits below 50 μm in width. The implications of this advancement are promising, particularly in the fields of electric drives and fuel cells, where accuracy and freedom of design are crucial. In this work, the latest results of the production of narrow, inclined slits in components made of pure iron will be shown. Characteristics like groove-to-groove distance and groove width were analyzed, achieving successful production of continuous slits with varying inclination angles of up to 30° within the manufactured components.", "venue" : "San Francisco, California, United States", "eventtitle" : "LASE, Photonics West", "doi" : "10.1117/12.3003688", "bibtexKey": "henn2024exceeding" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2f598a6daacce0f3f38fedf0b1756891a/manuelhenn", "tags" : [ "Ablation","AdditiveManufacturing","Laser","lpbf","micromaterialprocessing","myown","processdevelopment","ultrashortpulse" ], "intraHash" : "f598a6daacce0f3f38fedf0b1756891a", "interHash" : "303455222d9106686136782e34385d9c", "label" : "Combining LPBF and ultrafast laser processing to produce parts with deep microstructures", "user" : "manuelhenn", "description" : "", "date" : "2022-03-22 17:08:32", "changeDate" : "2022-03-22 16:19:42", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of the Lasers in Manufacturing Conference","series": "Proc.LiM", "year": "2021", "url": "https://wlt.de/sites/default/files/2021-10/ablation_drilling_cutting/Contribution_175_final.pdf", "author": [ "Manuel Henn","Matthias Buser","Volkher Onuseit","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Manuel", "last" : "Henn"}, {"first" : "Matthias", "last" : "Buser"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "abstract": "Laser Powder Bed Fusion (LPBF) is limited in the achievable accuracy, surface quality and structure size due to its inherent\r\nmelting process. The achievable structure sizes are mainly dependent on the focal diameter and the grain size of the\r\npowder. Smaller structures, especially deep and narrow slits with a width below 100 µm, are still a major challenge.\r\nCombining continuous wave and ultrashort pulsed lasers in the same optical system enables consecutive additive and\r\nsubtractive processes. This results in a quasi-simultaneous manufacturing process, where the emerging part can be\r\nprecisely machined with ultrafast laser ablation after each additively added layer. In the talk the system technology used\r\nfor the superposition of the lasers as well as the results of the combined additive and subtractive processes for the\r\nfabrication of deep and narrow slits in stainless steel parts will be shown.", "ee" : "http://dx.doi.org/10.1002/qre.1500", "language" : "english", "eventdate" : "23.06.2021", "bibtexKey": "Henn.2021.Combining" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/269d65fab1b9d63a8be572a060ac88586/manuelhenn", "tags" : [ "Ablations","Drilling","MicroMaterialProcessing","ProcessDevelopment","Steel","UltrashortPulse","myown" ], "intraHash" : "69d65fab1b9d63a8be572a060ac88586", "interHash" : "1d669348b6edc8826136d0b55fa80e04", "label" : "Advances in Dry Metal Forming Using Volatile Lubricants Injected Through Laser-Drilled Microholes", "user" : "manuelhenn", "description" : "", "date" : "2021-03-31 18:07:38", "changeDate" : "2021-03-31 16:07:38", "count" : 8, "pub-type": "inproceedings", "booktitle": "TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings","publisher":"Springer", "year": "2020", "url": "https://link.springer.com/book/10.1007%2F978-3-030-36296-6#about", "author": [ "Manuel Henn","Gerd Reichardt","Mathias Liewald","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Manuel", "last" : "Henn"}, {"first" : "Gerd", "last" : "Reichardt"}, {"first" : "Mathias", "last" : "Liewald"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "volume": "149","pages": "1979-1991", "language" : "eng", "eventtitle" : "TMS 2020 - Supplementle Proceedings 2020", "doi" : "https://doi.org/10.1007/978-3-030-36296-6", "bibtexKey": "Henn.2020.AdvancesDryMetalForming" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2f57fea912eb51883b306ebedb42428d1/manuelhenn", "tags" : [ "Ablation","Drilling","MicroMaterialProcessing","Peer","ProcessDevelopment","Steel","UltrashortPulse","myown" ], "intraHash" : "f57fea912eb51883b306ebedb42428d1", "interHash" : "3ef7d247c599cea6cd854d51cfb6f59a", "label" : "Dry Metal Forming Using Volatile Lubricants Injected into the Forming Tool Through Flow-Optimized, Laser-Drilled Microholes", "user" : "manuelhenn", "description" : "", "date" : "2021-03-30 19:33:28", "changeDate" : "2021-03-30 17:33:28", "count" : 8, "pub-type": "article", "journal": "JOM", "year": "2020", "url": "https://doi.org/10.1007/s11837-020-04169-6", "author": [ "Manuel Henn","Gerd Reichardt","Mathias Liewald","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Manuel", "last" : "Henn"}, {"first" : "Gerd", "last" : "Reichardt"}, {"first" : "Mathias", "last" : "Liewald"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "volume": "72","number": "7","pages": "2517--2524","abstract": "A novel tribologic system was developed in which volatile lubricants (carbon dioxide---CO2 or nitrogen---N2) were used as a substitute for mineral oil-based lubricants in deep drawing processes. This process allows an intermediate medium to be introduced into the tool contact surfaces under high pressure by flow-optimized, laser-drilled microholes. This eliminates the need for subsequent cost-intensive cleaning processes as volatile lubricants evaporate while expanding to ambient pressure without leaving any residue. This article gives an overview of the current findings to enable and characterize the novel tribologic system. The areas of microhole laser drilling by ultrashort pulsed laser radiation, characterization of the novel tribologic system and realization of the system using a prototype tool will be described.", "issn" : "1543-1851", "doi" : "10.1007/s11837-020-04169-6", "bibtexKey": "Henn.2020.DryMetalForming" } ] }