Laser Cutting of Functional Materials by Twin Laser Beam and Thermal Stress Analysis

双激光束激光切割功能材料和热应力分析

• 批准号: 16360050
• 负责人: MUTOH Yoshiharu
• 金额: $ 9.66万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360050/
• 关键词: Laser cutting; Twin beam; Functional Materials; Thermal stress analysis; ぜい性材料; レーザ; 割断加工; 熱応力; ガラス; 加工; 破壊力学; 熱伝導解析

1.According to the laser cutting experiment, crack growth direction was going to out of the laser scanning line when the direction of the laser changed regardless of the angle.2.Crack growth direction was predicted by FEM analysis with the maximum tangential stress theory. Result of the analysis showed good agreement with that of the experiment.3.It could be possible to control crack growth direction by controlling laser scanning direction according to the result of FEM analysis. However, control of laser scanning direction is complicate and it is difficult to predict a crack growth direction.4.Appling a twin laser beam placed forward and following of the crack tip with in parallel to the laser scanning line is effective to control the crack growth direction according to the result of FEM analysis. Crack growth direction could change by the beam intensity ratio between two beams and the position of the following beam.5.Twin laser beam head was developed by using a prism to sprit a laser beam. This method is simple and easy way to obtain twin laser beam. By adding the control system for the position of a prism in the laser head, it could be possible to cut the complicated shape based on the result of FEM analysis.6.Crack initiation behavior was studied by using the specimen without a starter notch. Crack may earlier initiates when the defocusing distance is small.7.Stress distribution was steep in case of defocusing distance is small according to the results of FEM analysis. Crack unstably propagated with the condition.

1.通过激光切割实验发现，当激光方向发生变化时，无论角度如何，裂纹扩展方向都将偏离激光扫描线。2.利用最大切向应力理论对裂纹扩展方向进行了有限元分析。分析结果与实验结果吻合较好。3.根据有限元分析结果，通过控制激光扫描方向来控制裂纹扩展方向。然而，激光扫描方向的控制比较复杂，很难预测裂纹的扩展方向。4.根据有限元分析的结果，在裂纹尖端前后平行放置一束平行于激光扫描线的双光束可以有效地控制裂纹的扩展方向。裂纹扩展方向会随着两束光束的光强比和下一束光束的位置而发生变化。5.利用棱镜对一束激光光束进行分束，研制了双光束头。该方法简单易行，可获得双光束。通过增加棱镜在激光头中的位置控制系统，可以根据有限元分析的结果来切割复杂的形状。6.利用无启动器缺口的试件，研究了裂纹的萌生行为。离焦距离越小，裂纹萌生越早。7.有限元分析结果表明，离焦距离较小时，应力分布较陡。裂纹在该条件下失稳扩展。

项目成果

Effect of roughness at the edge part of the specimen on laser cutting of a glass

样品边缘部分粗糙度对玻璃激光切割的影响

• 发表时间: 2007
• 期刊: Proceedings of JSME Hokuriku-Shinetsu Branch GAKUSEIKAI 36^<th> GAKUSEIIN SOTUSGYO-KENKYU HAPPYOUKAI
• 作者: K.Hirahara;Y.Miyashita;T.Kondoh;S.Supamard;R.Borrisutthekul;Y.Mutoh
• 通讯作者: Y.Mutoh

ガラスのレーザ割断におけるき裂発生挙動に及ぼす試験片端部粗さの影響

玻璃激光切割过程中试样边缘粗糙度对裂纹萌生行为的影响

• 发表时间: 2007
• 期刊: 日本材料学会第56期学術講演論文集
• 作者: 宮下幸雄;平原和哉;近藤俊美;Supamard Sujatanond;Rattana Borrisutthekul;武藤睦治
• 通讯作者: 武藤睦治

数値シミュレーションを援用したレーザ加工

使用数值模拟进行激光加工

• 发表时间: 2006
• 期刊: 長岡工業高等専門学校研究紀要 42・2
• 作者: 宮下 幸雄;武藤睦治;宮下幸雄
• 通讯作者: 宮下幸雄

NETSU-OURYOKU KAISEKINI MOTODUKU KIRETSU SHINTEN SEIGYO NI YORU ZEISEI ZAIRYOU NO Laser KATSUDAN

热电偶 怀石本色 KIRETSU 新天SEIGYONI YORU ZEISEI ZAIRYOU NO Laser KATSUDAN

• 发表时间: 2004
• 期刊: Proceedings of the 53th JSMS ANNUAL Meetings
• 作者: Y.Miyashita;H.Hasegawa;Y.Mutoh
• 通讯作者: Y.Mutoh

レーザによる精密割断

激光精密切割

• 发表时间: 2007
• 期刊: 全国商工新聞(2007年2月5日付) 第2768号
• 作者: Masayoshi;Yamamoto;Misako Masui;Masayoshi Yamamoto;Takashi Horiguchi;上原赫(監修);上原赫(監修);宮下幸雄
• 通讯作者: 宮下幸雄