成果報告書詳細
管理番号20150000000424
タイトル*平成26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2015/7/25
報告書年度2014 - 2014
委託先名国立大学法人大阪大学 独立行政法人日本原子力研究開発機構
プロジェクト番号P14030
部署名ロボット・機械システム部
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-FY2015) FY2014 Annual Report

1.-(1)
A computational science numerical simulation code was developed for phenomenological interpretations of multi-physics thermohydraulic phenomena including phase change effects for melting and solidifying of various metals by a laser irradiation. And the code was applied to evaluations of a fundamental laser coating process.

1.-(2)
The development of high speed imaging system has been performed as one of the development of in- situ dispersive measurement technique using synchrotron radiation facility SPring-8. A high speed CCD camera was introduced to take high speed imaging shootings. By using this camera, the measurement in 1msec has been enabled because the number of frames is dramatically increased up to 105 fps from 102fps, though the resolution is reduced from 16 bits to 12 bits. In this year, we have performed the derivation of best conditions for the dispersive shooting by using our unit converged X-ray to light with this camera.
Also, due to measure the melting and solidification phenomena by laser welding, we made the spherical powder installation apparatus which was able to set finite spherical powders from several hundreds μm to several μm at precision of 1 μm.

1.-(3)-1
Laser coating evaluation system was completed, required for developing a
fundamental technology of laser coating with a molten pool.

Controlling methods of particle size distribution and high power laser
have been developed.

1.-(3)-2
Laser coating evaluation system was completed, required for developing a
fundamental technology of laser coating without a molten pool.
Controlling methods of several kinds of particles' size distribution and
laser coating without a molten pool using a pulse laser have been
developed.

2.
Experiments of coating with a existing laser were performed. Base material was coated with Hastelloy(based on Ni), known as major material with high corrosion resistance, and Stellite(based on Co), known as major material with wear proof.
Optimizations of laser power, shape of laser focusing spot, speed of powder scanning, feed rate of powder, flow rate of shield gas and angle of feed nozzle were promoted. Coated layer, cross section of the layer and bonded interface was observed and evaluated.

3.
A laser cladding head with a jet nozzle to supply metal powders to a center of laser focusing spot required for laser coating without a molten pool was designed and fabricated. A powder feeder for supplying metal powders to the laser cladding head was designed.
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