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레이저 집적 쓰기 가공을 이용한 Soft gripper 제작
이창민(Changmin Lee),문상흔(Sangheun Moon),안지훈(Jihoon Ahn),구상모(Sangmo Koo) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Polydimethylsiloxane (PDMS) is frequently used to manufacture pliable actuators due to its transparent and robust mechanical attributes. This research successfully produced a three-dimensional (3D) PDMS actuator through laser direct writing (LDW) processing, which is more expedient and efficient than the conventional and arduous lithography process. The intricate 3D PDMS structure was affixed to polyimide (PI) to operate as a thermal actuator. As the temperature increases, the combined structure may bend due to the different coefficients of thermal expansion between PDMS and PI. Utilizing laser-based processing provided advantageous results in creating complex 3D shapes for PDMS structures. Throughout this study, the effects of altering the actuator’s shape were investigated, resulting in observable changes in shape and bending angle. The collected data were used to construct an efficient soft gripper by modifying the initial design. This indicates the potential for swift design alterations through laser processing and the possibility of creating an effective and versatile gripping arrangement (e.g., incorporating truss structures).
니켈 나노입자의 레이저기반 소결을 통한 유연성 전도성 전극 가공
김대현(Daehyeon Kim),이한종(Hanjong Lee),문상흔(SangHeun Moon),이창민(ChangMin Lee),구상모(Sangmo Koo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Recently, the importance of processing techniques on a flexible substrate is emerging. In particular, as the application of flexible devices has expanded, research on fabrication for electrically conductive patterns on this diverse substrate, especially on polymers, has been performed. In this study, it is noted that nickel has a higher resistance to oxidation than copper. The nickel nanoparticle-based ink was synthesized and sintered on the Polydimethylsiloxane(PDMS) substrate through laser-direct writing. Nickel conductive patterns processed on flexible substrates retain their shape and properties despite mechanical deformation (e.g., bending). It was confirmed that the electrical properties were also maintained for a long time under oxidizing conditions. Therefore, it was utilized in applications such as flexible heaters, and it will be possible to expand to more applications.