成果報告書詳細
管理番号20160000000666
タイトル*平成27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2016/8/23
報告書年度2015 - 2015
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) FY2015 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 (Japan Atomic Energy Agency) 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 code solves mass, momentum and energy conservation equations simultaneously in a finite difference form to evaluate various complex phenomena, such as a laser light-material interaction, liquid metal thermohydraulics in welded pond with a mushy zone, etc.
The SPLICE code was applied to the laser coating processes with/without the welded pond. The result obtained in this 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.


1.-(2)
The observation of melting and solidification phenomenon in metal ball under laser irradiation was carried out using a synchrotron radiation facility SPring-8. In order to coat a metal powder on base metal, it was revealed for the first time in the world by the high-speed imaging system developed in this study that the melting temperature of the base metal is important to be higher than that of a metal powder.


1.-(3)-1

Phenomena of laser coating with a molten pool could be observed with a hi-speed video camera.
Development of controlling method of particle size distribution was promoted.


1.-(3)-2

Phenomena of laser coating without a molten pllo could be observed with a hi-speed video camera.
Develpoment of laser coating method with a pulse fiber laser was started.

Laser coating unit with blue diode lasers was experimentally produced.


Effect of laser with shorter wavelength on coating quality was evaluated.

Laser coating unit with infrared diode lasers was developed and installed in machine tool.



2.
The dependence of weld penetration depth on surface morphology,
powder particle size, feed rate of powder, and heat flux in laser coating was investigated.

It was successful to coat a 50mm x 75mm test piece material with metal, in the condition
for coating thickness of more than 1mm, in 20% shorter time by laser coating method
than by Plasma Transfer Arc (PTA) method.



3.
The developments of a laser coating apparatus equipping a blue diode laser unit and a fine laser coating apparatus to be utilized for manufacturing of precise industrial parts and medical parts were promoted.
A fine laser coating apparatus expecting to realize non-molten pool type laser coating was developed.
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