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Software supports and E-manufacturing for DMT process
지해성,Jeonghun Suh 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10
The working principle of the laser-aided direct metal tooling(DMT) process is the use of a laser to selectively clad metallic powder on the substrate material part. A high-powered laser beam is focused on a metal substrate to create a molten weld pool; as the laser passes by the deposit is quickly cooled, leaving behind a thin line of metal clad. The major advantage of the DMT process is its capability of depositing a multitude of materials. Since the material deposition relies only on the feeding of a powder, it is relatively simple to use multiple kinds of materials. In fact, recent research has shown that DMT is capable of manufacturing binary functionally graded materials as well. The study is to develop a software support tool, visual simulation technique, as one of the e-manufacturing capability established for a unique DMT process.
Kim, Hee Un,Kim, Ji-Hoon,Suh, Hongsuk,Kwak, Jeonghun,Kim, Dongwook,Grimsdale, Andrew C.,Yoon, Sung Cheol,Hwang, Do-Hoon The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.93
<P>We have found that 9,9′BF can be used as an electron acceptor for P3HT-based OPVs while similar devices using 4,4′BP do not show any photovoltaic effect. This can be related to the respective aromaticity and antiaromaticity of the reduced forms of 9,9′BF or 4,4′BP. The OPV device fabricated using P3HT and 9,9′BF exhibited a PCE of 2.28% with a <I>V</I><SUB>oc</SUB> of 1.07 V, a <I>J</I><SUB>sc</SUB> of 5.04 mA cm<SUP>−2</SUP>, and a FF of 0.42.</P> <P>Graphic Abstract</P><P>We have found that 9,9′BF can be used as an electron acceptor for P3HT-based OPVs while similar devices using 4,4′BP do not show any photovoltaic effect. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc46557h'> </P>
이규복(Kyubok Lee),지해성(Haeseong Jee),서정훈(Jeonghun Suh) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Directed energy deposition (DED), an ASTM(American Society for Testing and Material) process classification of 3D printing or additive manufacturing (AM) process, has enabled to build full density metallic tools and parts using metal powders precisely delivered and controlled for deposition with no powder bed. Using 5-axis machine it is capable of building overhang/undercut parts with no support structures, which, however, requires an advanced process management that controls 5-axis tool paths for layer-by-layer builds. This study proposes a methodical approach for generating layer-by-layer DED tool paths visualized and validated for proper build of parts on 5-axis base table. It first introduces ‘three dimensional layer (3DL)’ information followed by visual simulations implemented with the proposed method.