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成果報告書詳細
管理番号20170000000483
タイトル*平成28年度中間年報 SIP(戦略的イノベーション創造プログラム)/革新的設計生産技術  高付加価値設計・製造を実現するレーザーコーティング技術の研究開発
公開日2017/6/15
報告書年度2016 - 2016
委託先名国立研究開発法人日本原子力研究開発機構 国立大学法人大阪大学
プロジェクト番号P14030
部署名IoT推進部
和文要約
英文要約Title:SIP (Cross-Ministerial Strategic Innovation Promotion Program) / Innovative Design/Manufacturing Technologies Development of laser coating methods for realization of high value-added design and manufacturing (FY2014-FY2018) FY2016 Annual Report
1-(1) Computational science numerical simulations for melting and solidifying phenomena of various metals by a laser irradiation: A general-purpose three-dimensional thermohydraulics numerical simulation code SPLICE was developed at JAEA and designed to deal with gas-liquid-solid consolidated incompressible viscous flows with a phase change process in various laser applications, such as coating, welding, piercing, drilling, cutting, etc. The result obtained in these numerical simulations is very encouraging in the sense that the SPLICE code would be used as one of the efficient tools for simulating the complex phenomena related to the laser coating processes.
2- (2) Elucidation of a laser coating phenomena: In order to achieve high quality coating, operand observation of melt solidification phenomenon in metal under vacuum using synchrotron radiation imaging technique was performed at BL22XU in SPring-8. As a result, it was clarified that the metal melt-solidification phenomenon greatly differs between the atmosphere and vacuum. In the case of a cupper on an aluminium oxide substrate, the prospect of achieving high quality coating was obtained.
1- (3) Development of high-quality laser coating technology for processing resistant materials: A development of highly precise laser coating process is aimed for improving performances of some pars used for precise machines or medical instruments. In this year, a laser coating machine with a powder center feeding was improved for the establishment of the highly precise laser coating process. In this improvement, the powder jet nozzle with outer nozzle was developed to be able to focus a powder flow. Furthermore the powder feeder with the motorized needle valve adjusting a powder feeding rate and the powder feeding rate monitor was developed to be able to feed a small amount of powder less than 5mg/sec. As these results, this year purposes of the nozzle diameter less than φ0.3mm and the minimum powder feeding rate less than 5mm3/sec, the minimum coating width less than 0.5mm, the minimum coating thickness less than 0.2mm were achieved.
2 Research and development of molten pool type laser coating technology: This research aims to obtain coatings of higher quality than those made by conventional techniques by using laser coating. The goal of 2016 is to shorten the coating time by 20% over those made with conventional technology. The result achieved 44% less time reduction than the target of 20% with laser coating. In addition, laser coating realized a flat penetration that is difficult with conventional techniques. By applying them, laser coating succeeded in coating even materials that could not be coated by conventional techniques.
3 Research and development of non-molten pool type laser coating process: For the correspondence to the true products with the complicated shape, two axes of a tilting axis and a rotating axis were added to the laser coating machine with three orthogonal axes of X-axis, Y-axis and Z-axis. As the result, the laser coating machine was developed having the purpose performances of five axes, the feeding strokes more than 100mm and the feeding speed more than 50mm/sec. The laser coating tests using true products were carried out to inspect the practicability of the non-molten pool type laser coating process with the laser coating machine with a powder center feeding. Plastic molding dies were repaired with a micro, thin and hard coating layer without a thermal distortion. The jigs used for produce bearing rollers manufactured with the wear resistance coating layer made of tungsten carbide.
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