松坂 壮太

ガラスへの機能付与の一例として，固体イオン交換法を利用したガラス内銀析出物の形成があり，工業応用に向けて銀析出物形状の制御手法が検討されている．本研究では，レーザでの局所加熱を用いた銀析出物形状の制御を試行した．その結果，レーザ加熱部で選択的に銀析出が進行し，析出方向や太さはレーザ走査方向・スポット径により制御可能だとわかった．さらに，環境温度を下げたときレーザ加熱部以外の不要な析出が抑制できた．

固体イオン交換法によって銀イオン添加された試料に対し，電圧を印加することでガラス内に銀を析出させることができる．本手法は，ガラス内部に微細な導電路を形成する技術として期待されているが，析出物の形状制御手法が確立されていない．ここで，銀析出はき裂の生成をともなって進行することが確認されている．そこで本研究では，ホイール操作，レーザ照射を用いたき裂作成による析出物の誘導を行い，その原因を考察した．

<p>The authors have reported the laser-induced metal sphere migration in the glass. The metal sphere migrated toward the light source along the optical axis. In this paper, we describe the metal sphere separation by two laser beam illumination from the opposite direction. A stainless-steel sphere in borosilicate glass was heated by two continuous-wave green laser illumination. The laser beam diameter influenced the separation result. One metal sphere was separated to two spheres, when the beam diameter was 60 and 80 µm. When the beam diameter was 100 µm, the one metal sphere was not separated and maintained the shape and migrated toward one direction. When the beam diameter was 20 and 40 µm, laser illumination separate two small sphere from the metal sphere and one metal sphere was left. Hence the one metal sphere separated to three metal spheres. In-situ observation with a high-speed camera and numeral temperature calculation clarified the separation process. Finally, the size control of the metal sphere was demonstrated by changing the beam diameter.</p>

<p>Turning with suppressing thrust force has been proposed as a method of processing a micro-shaft. Advantages of thrust force free cutting have been demonstrated by turning micro-shaft (diameter: ~0.05 mm). Although the feed rate is a small value in the previous research, the processing efficiency has not been discussed because the processed shaft is small. If the long shaft is machined, it is indispensable to increase the feed rate to improve the machining efficiency. Therefore, in this research, we confirmed whether the suppression of thrust force was possible with high feed rate to expand the application range of thrust force suppression turning. The condition of suppressing thrust force by turning the long shaft of the medium diameter (~1 mm) was chosen, and the range of the small deformation by suppressing thrust force was clarified. It was also found that deflection due to principal cutting force also caused dimensional error even when thrust force was suppressed.</p>

Wheel scribing techniques were commonly used for glass separation. We have studied on the internal stress field during/after wheel scribing using the photoelastic method. Internal stress data obtained by photoelastic method was integrated data of the light progression, and internal stress induced by a scribing wheel distributed three-dimensionally. This characteristic complicates the explanation of the photoelastic data. In this paper, we investigate two dimensional internal stress fields by the indentation of a wedge on a thin glass sheet. As a result, birefringence and azimuthal angle was obtained during/after the indentation. Internal stress by the plastic deformation was observed. First, median cracks were propagated after the indentation, then lateral cracks were propagated. The internal stress was released along with the crack propagation.