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成果報告書詳細
管理番号20170000000474
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 ガラス部材の先端的加工技術開発
公開日2017/6/15
報告書年度2016 - 2016
委託先名国立大学法人京都大学 国立研究開発法人産業技術総合研究所 石塚硝子株式会社 日本電気硝子株式会社
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 advanced glass processing technologies (FY2014-FY2018) FY2016 Annual Report

1. Large-area precision molding technology: Relaxation share modulus of silicate and phosphate glasses was obtained from the creep test and was analyzed by the Maxwell model. It was found that the relaxation time of the modulus was related with the formability of glasses. A simulator for the estimation of viscoelasticity of glasses by the means of molecular dynamics and a visualization program for better understanding atomic mobility were developed. The deformation of small cylindrical samples of silica and silicate glasses under the uniaxial stress of 1 GPa was successfully simulated. The contact angle of zinc phosphate and bismuth borate glass melts on various substrates was measured to estimate the glass/substrate reactivity. The reactivity agreed qualitatively with the prediction from the reaction energy. 160 arrays of 12 dimples were fabricated on a 6 inch diameter mold. In addition, micro lenses were formed on a 6 inch diameter glass disc by the molding method. 2. Injection molding for rapid production of complex shaped products: We have prepared phosphate glasses through a novel glass synthetic process. The water-resistance of the glass was improved markedly by the modification of chemical composition. In addition, we succeeded in synthesizing the organic-inorganic hybrid glasses with a melting point higher than 200 degree, to improve the heat-resistance of hybrid glasses. It was confirmed that the glasses had heat- and UV-resistance for retention of transparency higher than polycarbonate. It was possible to fabricate arrays of lenses made of hybrid glass by the injection molding method, similarly to those made of resins. The molding efficiency of the small lenses was higher than 90%. 3. Fast and precise cutting and joining technologies: We developed a new method of laser cutting that prevents the generation of micro-cracks on the surface of cut glasses. In this method, two laser beams are used simultaneously; one laser beam produces a trench on the glass surface, generating micro-cracks during the process, and the other laser beam heats near the glass surface and erases the micro-cracks in the vicinity of the modification area by laser irradiation. Applying this laser cutting method, we achieved crack-free laser cutting of 0.5 to 1-mm-thick glass plates and laser drilling of ultra-thin glass plates at the rate of 100 holes per second. In addition, we developed a new laser irradiation method for the stabilization of laser melting inside a glass. Excess accumulation of laser energies results in the unstable writing of a molten line in a glass and generates a concentrated stress in the molten region. In the new laser irradiation method, the excess heat accumulation is prevented by periodically modulating the laser pulse energies. Using this method, we succeeded in writing a stable molten line and reducing the concentration of the stress generated in the molten region. This method is important for the welding of glasses.
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