Updated on 2026/07/22

写真a

 
JIMBO KOKI
 
Organization
Undergraduate School School of Science and Technology Assistant Professor (non-tenured)
Title
Assistant Professor (non-tenured)
External link

Degree

  • Doctor of Engineerng ( 2022.3   Meiji University )

Research Interests

  • Structual optimization

  • Additive Manufacturing

  • Material extrusion

  • Continuous fiber composites

  • CFRP

  • Manufacturing system

  • Design for Additive Manufacturing (DfAM)

  • Mobile Additive Manufacturing

  • Digital fabrication

  • Multi-axis machining

Research Areas

  • Manufacturing technology (mechanical,electrical/electronic, chemical engineering) / Manufacturing and production engineering

  • Manufacturing technology (mechanical,electrical/electronic, chemical engineering) / Design engineering

Education

  • Meiji University   Graduate School of Science and Technology   Mechanical Engineering Program

    2019.4 - 2022.3

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    Country/Region： Japan

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Research History

  • Tokyo Denki University   School of Engineering   Part-time lecturer

    2025.4

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  • Tokyo Denki University   School of Engineering, Department of Advanced Machinery Engineering   Assistant Professor

    2022.4 - 2025.3

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    Country/Region：Japan

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  • Meiji University   School of Science and Technology   Part-time lecturer

    2022.4 - 2025.3

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    Country/Region：Japan

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  • Japan Society for the Promotion of Science   Research Fellowship for Young Scientists DC2

    2021.4 - 2022.3

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    Country/Region：Japan

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  • Meiji University   School of Science and Technology   Research Assistant

    2019.4 - 2021.3

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Professional Memberships

  • Japan Society for Design Engineering

    2026.4

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  • NPO法人VCADシステム研究会

    2022.10

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  • The Japan Society for Precision Engineering

    2019.4

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  • The Japan Society of Mechanical Engineers

    2016.8

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Committee Memberships

  • 設計工学会   出版部会委員会委員  

    2026.6   

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    Committee type：Academic society

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  • 精密工学会   会誌編集委員  

    2023.4 - 2026.3   

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    Committee type：Academic society

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Papers

  • Design and one-shot fabrication of a 2-DOF tendon-driven robotic finger via additive manufacturing using continuous CFRP Reviewed

    Koki Jimbo, Shinya Morita, Toshitake Tateno

    The International Journal of Advanced Manufacturing Technology   2026.4

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s00170-026-18134-1

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    Other Link： https://link.springer.com/article/10.1007/s00170-026-18134-1

  • Design Optimization of Continuous Fiber Arrangement Using Lamination Parameters in Material Extrusion-Based Additive Manufacturing Reviewed

    Koki Jimbo, Tohru Shitani, Satoshi Nakajima, Shinya Morita

    International Journal of Automation Technology   18 ( 5 )   712 - 720   2024.9

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Fuji Technology Press Ltd.  

    Continuous carbon fiber-reinforced polymer (CFRP) can be used in material extrusion-based additive manufacturing (AM). By appropriately arranging and orienting the continuous fibers, lightweight or high-strength mechanical parts and structures with complex deformation behavior and locally modified stiffness can be fabricated. Although many studies have been conducted to optimize the arrangement of continuous fibers fabricated using CFRP in AM, most of them have focused on the mechanical properties of the fabricated object in the lamination plane. This focus is due to the characteristics of AM, in which continuous fibers are placed in a plane and then layered, allowing for optimization at a relatively low computational cost. However, the computational cost of targeting mechanical properties outside the fabrication plane is enormous, making optimization design difficult. Furthermore, if the fiber material is arranged discontinuously, a process to cut the fibers is required during fabrication, resulting in decreased productivity and fabrication accuracy. Therefore, it is necessary to optimize the fiber arrangement, considering the continuity of the fiber material. To address these problems, this study aims to propose an efficient fiber arrangement optimization method, considering the continuity of the fiber material. For efficient stiffness optimization, the stiffness is represented by a combination of lamination parameters that have been used in the lamination design of CFRP sheets. A genetic algorithm was employed as the optimization algorithm. The proposed method using lamination parameters was implemented, and a case study of fiber arrangement optimization was performed on a simple structure. In addition, a full search was performed to evaluate all possible fiber arrangements for the target structure. The results of the proposed method and the full search confirmed the reliability of the proposed method, which achieved results that were equivalent to the best results obtained in the full search. In addition, a conventional method that directly optimizes the fiber arrangement as a design parameter was implemented. This result was compared with that of the proposed method. For a simple structure with a small number of layers, averaged over 20 runs, the conventional method converged faster than the proposed method, but the convergence speed worsened as the number of layers increased. Moreover, the fiber arrangement obtained by the conventional method was less continuous than the result of the proposed method. These results confirm the usefulness of the proposed method.

    DOI： 10.20965/ijat.2024.p0712

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  • Material extrusion-based additive manufacturing with multi-legged robot: fundamental investigation of path planning and manufacturing capabilities Reviewed

    Koki Jimbo

    Journal of Advanced Simulation in Science and Engineering   11 ( 1 )   222 - 235   2024

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Simulation Technology  

    DOI： 10.15748/jasse.11.222

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  • Graph-based optimization of continuous extrusion path in FRP-AM for compliant mechanism fabrication Reviewed

    Koki JIMBO, Toshitake TATENO

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   17 ( 1 )   JAMDSM0005 - JAMDSM0005   2023

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Mechanical Engineers  

    DOI： 10.1299/jamdsm.2023jamdsm0005

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  • Design optimization of infill pattern structure and continuous fiber path for CFRP-AM: Simultaneous optimization of topology and fiber arrangement for minimum material cost Reviewed

    Koki Jimbo, Toshitake Tateno

    Precision Engineering   74   447 - 459   2022.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.precisioneng.2021.10.009

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  • Design and simulation of inchworm robot locomotion for mobile additive manufacturing Reviewed

    Koki Jimbo

    Journal of Advanced Simulation in Science and Engineering   12 ( 1 )   295 - 310   2025

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Simulation Technology  

    DOI： 10.15748/jasse.12.295

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  • FEM Simulation as an Element Based on Infill Pattern Structures Fabricated with CFRP-AM Reviewed

    Koki Jimbo, Toshitake Tateno

    Journal of JSPE   87 ( 1 )   127 - 133   2021.1

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society for Precision Engineering  

    DOI： 10.2493/jjspe.87.127

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  • Shape Contraction in Sintering of 3D Objects Fabricated via Metal Material Extrusion in Additive Manufacturing Reviewed

    Koki Jimbo, Toshitake Tateno

    International Journal of Automation Technology   13 ( 3 )   354 - 360   2019.5

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Fuji Technology Press Ltd.  

    Additive manufacturing (AM) using metal materials (metal AM) is useful in the fabrication of metal parts with complex shapes, which are difficult to manufacture via subtractive processing. Metal AM is employed in the manufacture of final products as well as in prototyping. Recently, certain metal-AM machines have been commercialized. Powder-bed fusion and direct energy deposition are the main types of metal AM; they require the use of a high-power laser or electron beam and most of them are highly expensive. On the other hand, AM machines of the material-extrusion (ME) type can fabricate metal parts at a low cost. ME is the method of extruding materials from a nozzle and fabricating thin layers. By mixing a metal filler with a base material, it is possible to impart various mechanical properties to the extruded material, such as electrical or thermal conductivity. If the extruded material is baked in a furnace after fabrication, the object can be sintered. During the sintering process, the fabricated objects always shrink and dimensional errors occur. One of the reasons for the shrinkage is that voids are generated inside the object after the degreasing process and collapse during the sintering process. Because the void is generated as a space by replacing a binder that becomes vaporized during the degreasing process, the shrinkage may be controlled by decreasing the content in polymers. In this study, the effect of the metal filler density on the shrinkage in shape was investigated through experiments using two types of metal ME AM. One type is the fused filament fabrication (FFF), in which a material that consists of a metal filler and fused plastics is extruded; the other type is the ultrasonic vibration-assisted ME (UVAME) device, in which a metal powder suspension with a small amount of thickening polymer is extruded. In the latter method, materials with an extremely high density in metal fillers were used; it was considered that degreasing was not required. Two types of specimens were fabricated using AM devices; they were then degreased and sintered. The resulting shapes of the objects were measured with a 3D scanner and were compared. The experimental results showed that the shrinkage of the material with a high density of metal fillers was less than that of the material with a low density of metal fillers.

    DOI： 10.20965/ijat.2019.p0354

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  • Design of isotropic-tensile-strength lattice structure fabricated by AM Reviewed

    Koki Jimbo, Toshitake Tateno

    Transactions of the JSME (in Japanese)   85 ( 871 )   p. 18-00098   2019.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

    DOI： 10.1299/transjsme.18-00098

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Presentations

  • Design and Fabrication of Foldable Structure using Metal Wire in Material Extrusion Methods International conference

    Koki JIMBO, Shinya MORITA

    The 6th International Conference on Design Engineering and Science, ICDES 2025  2025.8 

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    Event date： 2025.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Alexandria   Country/Region：Egypt  

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  • Study on mobile additive manufacturing for a cooperative manufacturing system ―Fabrication and locomotion using an inchworm robot―

    Koki Jimbo, Toshitake Tateno

    2026.3 

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    Presentation type：Oral presentation (general)  

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  • Evaluation of continuous carbon fiber damage by electrical property measurements in multi-axis additive manufacturing

    Koki Jimbo, Akira Mizuno, Shinya Morita, Toshitake Tateno

    The 11th International Conference on Leading Edge Manufacturing in 21st Century (LEM21)  2025.12 

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    Presentation type：Poster presentation  

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  • 補装具製作におけるAM活用 Invited

    神保康紀

    日本機械学会 2025年度年次大会，特別行事：先端技術フォーラム，アディティブマニュファクチャリング（3Dプリンター）で拓くスポーツ工学  2025.9 

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    Presentation type：Oral presentation (invited, special)  

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  • Title Study on Deformation of a Wire-driven Soft Robot Integrally Fabricated with Material Extrusion

    Koki Jimbo, Shinya Morita

    2025.3 

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    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 3D プリンタを用いたデジタルファブリケーションのための機械部品の構造設計 Invited

    VCAD システム研究会 第 62 回定例研究会  2023.2  ＶＣＡＤシステム研究会

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    Language：Japanese  

    Venue：理化学研究所 和光事業所内 大河内記念ホール  

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  • DEVELOPMENT AND LOCOMOTION EXPERIMENT OF INCHWORM ROBOT FOR MOBILE ADDITIVE MANUFACTURING International conference

    Koki Jimbo

    21st International Conference on EXPERIMENTAL MECHANICS (21st ICEM)  2025.7 

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    Event date： 2025.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Bologna   Country/Region：Italy  

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  • Study on composite extrusion rate in material extrusion process using continuous carbon fiber

    2024.3 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Integrated fabrication of wire-driven robotic flexure finger by material extrusion using continuous fiber

    2024.3 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 材料押出法によるロボットハンドの一体製作に向けた柔軟構造設計法の研究

    神保康紀,瀬山紗来,森田晋也

    日本機械学会 2023年度 年次大会  2023.9  日本機械学会

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京都立大学（南大沢キャンパス）   Country/Region：Japan  

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  • 連続繊維を使用した複合材料AM製作物の強度設計法

    神保康紀, 白川達仁, 森田晋也

    生産システム部門研究発表講演会2023  2023.3  日本機械学会生産システム部門

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州工業大学 戸畑キャンパス  

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  • Graph-based Optimization of Continuous Extrusion Path in FRP-AM for Compliant Mechanism Fabrication International conference

    ◎Koki JIMBO, Toshitake TATENO

    The 10 th International Conference on Leading Edge Manufacturing in 21st Century (LEM21)  2021.11  日本機械学会（生産加工・工作機械部門，生産システム部門）

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    Event date： 2021.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country/Region：Japan  

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  • Design Optimization of infill pattern structure and continuous fiber path for CFRP-AM International conference

    Koki JIMBO, Toshitake TATENO

    The 18th International Conference on Precision Engineering (ICPE2020)  2020.11  The Japan Society for Precision Engineering

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    Event date： 2020.11

    Language：English   Presentation type：Oral presentation (general)  

    Country/Region：Japan  

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  • Design of Thermal Insulation Infill Structures Fabricated by Metal Material Extrusion in Additive Manufacturing International conference

    Koki Jimbo, Toshitake Tateno

    International Conference on Design and Concurrent Engineering 2019 & Manufacturing Systems Conference 2019 (JSME iDECON/MS2019)  2019.9  The Japan Society of Mechanical Engineers

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    Event date： 2019.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Tohoku University   Country/Region：Japan  

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  • Fabrication and evaluation of auxetic structures with different features generated by additive manufacturing International conference

    Akihisa TAKAHASHI, Koki JIMBO and Toshitake TATENO

    International Conference on Design and Concurrent Engineering 2019 & Manufacturing Systems Conference 2019 (JSME iDECON/MS2019)  2019.9  The Japan Society of Mechanical Engineers

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    Event date： 2019.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Tohoku University   Country/Region：Japan  

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  • DESIGN OF CFRP INFILL STRUCTURE FABRICATED BY ADDITIVE MANUFACTURING FOR CONTROLLING ANISOTROPY OF MECHANICAL PROPERTIES International conference

    Koki JIMBO, Toshitake TATENO

    8th International Conference Mechanics and Materials in Design (M2D 2019)  2019.9 

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    Event date： 2019.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：University of Bologna   Country/Region：Italy  

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  • WINDING DEPOSITION METHOD OF ADDITIVE MANUFACTURING FOR FABRICATION OF FUNCTIONAL CYLINDRICAL PARTS International conference

    Toshitake Tateno, Koki Jimbo and Mitsuhiro Kosaka

    8th International Conference Mechanics and Materials in Design (M2D 2019)  2019.9 

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    Event date： 2019.9

    Language：English   Presentation type：Poster presentation  

    Venue：University of Bologna   Country/Region：Italy  

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  • Finite Element Method for Composite Material Structures fabricated by AM International conference

    Koki JIMBO, Toshitake TATENO

    17th International Conference on Precision Engineering  2018.11  The Japan Society for Precision Engineering

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    Event date： 2018.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Kamakura Prince Hotel   Country/Region：Japan  

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  • Design of Cell-based Compliant Mechanism in Consideration of Multi-Material Additive Manufacturing International conference

    Toshitake Tateno, Koki Jinbo, Haruki Mizokami

    International Conference on Design Engineering and Science  2017.9  Japan Society for Design Engineering

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    Event date： 2017.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：NOVOTEL Aachen City   Country/Region：Germany  

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  • Toolpath planning method for suppressing fiber damage during fabrication process in material extrusion using continuous CFRP

    Akira Mizuno, Koki Jimbo, Shinya Morita

    The 11th International Conference on Leading Edge Manufacturing in 21st Century (LEM21)  2025.12 

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    Language：English   Presentation type：Oral presentation (general)  

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  • Simulation of inchworm robot locomotion via center of gravity control for mobile additive manufacturing

    Koki Jimbo, Toshitake Tateno

    The 44th International Conference on Simulation Technology  2025.9 

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    Language：English   Presentation type：Oral presentation (general)  

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  • Effect of Nozzle Angle on Strength of Fabricated Object in Material Extrusion using Continuous CFRP

    Akira Mizuno, Koki Jimbo, Shinya Morita

    2025.3 

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    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Study on step motion of inchworm robot for mobile additive manufacturing

    Koki Jimbo

    The 43rd JSST Annual International Conference on Simulation Technology  2024.9 

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  • Study on Cutting and Composite Extrusion of Continuous Carbon Fiber in Material Extrusion-based Additive Manufacturing

    Koki JIMBO, Shinya MORITA

    2024.9 

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    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 材料押出法のアディティブマニュファクチャリングにおける加工経路に着目した機械部品内部構造の設計法 Invited

    神保康紀

    【第132回】将来技術研究会  2023.12  将来技術研究会（ATOM）

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    Language：Japanese  

    Venue：日本大学 理工学部 駿河台校舎  

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  • Material extrusion-based additive manufacturing with multi-legged robot for large scale fabrication

    Koki Jimbo

    The 42nd JSST Annual International Conference on Simulation Technology  2023.8 

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    Language：English   Presentation type：Oral presentation (general)  

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  • 『行き止まりか、躍進か、製造業の最後の分岐点』 ー3Dプリンタでつくる未来への道－

    第12回:次世代センシングメソッド創出研究分科会  2023.1  インダストリアル・バリューチェーン・イニシアチブ

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    Language：Japanese  

    Venue：オンライン   Country/Region：Japan  

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  • Toolpath Planning for Simultaneous Fabrication with Multi-Nozzle in Material Extrusion-based Additive Manufacturing

    Koki Jimbo

    The 41st JSST Annual International Conference on Simulation Technology  2022.8 

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    Language：English   Presentation type：Oral presentation (general)  

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  • Design of tree-like infill structures for metal material extrusion type of additive manufacturing

    The 5th International Conference on Design Engineering and Science  2020.11 

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    Language：English   Presentation type：Oral presentation (general)  

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  • AMで製作されたCFRP構造に適した効率的な剛性シミュレーション

    神保康紀,舘野寿丈

    精密工学会春季大会学術講演会  2020.3  精密工学会

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Country/Region：Japan  

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  • CFRP-AMによる三角形構造の剛性異方性の設計と製作

    神保康紀,舘野寿丈

    生産システム部門研究発表講演会  2020.3  日本機械学会

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Country/Region：Japan  

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  • 金属材料押出AM製作物の焼成過程における形状ひずみを抑制する格子構造の設計

    神保康紀,舘野寿丈

    日本機械学会年次大会  2019.9  日本機械学会

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    Language：Japanese   Presentation type：Poster presentation  

    Country/Region：Japan  

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  • AMによって作成されたセル構造体のセルの大きさが引張強度および剛性に及ぼす影響

    神保康紀,舘野寿丈

    生産システム部門研究発表講演会  2017.3  日本機械学会

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：埼玉大学   Country/Region：Japan  

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  • AMによって作成されたセル構造体のセルの大きさが強度に及ぼす影響

    神保康紀,舘野寿丈

    日本機械学会年次大会  2016.9  日本機械学会

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州大学   Country/Region：Japan  

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Awards

  • 2025年度生産システム部門優秀講演論文表彰

    2026.3   一般社団法人 日本機械学会生産システム部門   材料押出法で一体製作したワイヤ駆動ソフトロボットの変形挙動に関する研究

    神保康紀

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  • Outstanding Presentation Award

    2026.1   Japan Society for Simulation Technology   Simulation of inchworm robot locomotion via center of gravity control for mobile additive manufacturing

    Koki Jimbo

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  • 2023年度生産システム部門優秀講演論文表彰

    2024.3   一般社団法人 日本機械学会生産システム部門   連続繊維を使用した複合材料AM製作物の強度設計法

    神保康紀

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    Award type：Award from Japanese society, conference, symposium, etc.  Country/Region：Japan

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  • Outstanding Presentation Award JSST2023

    2023.12   Japan Society for Simulation Technology   Material extrusion-based additive manufacturing with multi-legged robot for large scale fabrication

    Koki Jimbo

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    Award type：Award from international society, conference, symposium, etc.  Country/Region：Japan

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Research Projects

  • 移動型積層造形法における複数造形装置の協調生産

    Grant number：26K17288  2026.4 - 2029.3

    日本学術振興会  科学研究費助成事業  若手研究

    神保 康紀

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    Authorship：Principal investigator 

    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

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  • インチワーム型ロボットによる移動型積層造形法

    Grant number：23K13237  2023.4 - 2026.3

    日本学術振興会  科学研究費助成事業  若手研究

    神保 康紀

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    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

    本申請課題は積層造形法の造形サイズの制約を解決するため，インチワーム（尺取り虫）型ロボットに着目した移動型造形装置の開発とその加工経路計画法の確立を目指すものである．積層造形法を用いた機械部品一体製作による，組立工程の削減やサプライチェーンの短縮を目標としている．
    製作物の寸法が大きくなるほど造形精度および生産効率が低下するという従来の造形装置の課題に対し，造形装置が製作対象の周りを移動しながら造形する移動型造形装置に着目した．本申請課題では，この造形装置を使用した大型部品一体製作のための造形装置の開発，加工経路計画アルゴリズムの実装，実際の造形による課題解決に対する提案手法の有効性の評価を行う．具体的な造形装置の構想は，インチワーム型ロボットに材料押出ノズルを搭載し，積層造形と装置の移動を同一の機構で達成するものである．
    本年度はまず，装置の移動を実現する手段として六脚ロボットを採用し移動型装置における造形可能寸法と造形精度について研究を行った．実際に装置を開発して造形実験を行った結果，装置の移動時のわずかな姿勢変化によって押出ノズルと材料付加の対象物体の角度が変化し，大きな造形誤差につながるとことを明らかにした．また，自身の造形物が移動における障害になり，これが原因で造形精度が低下することも分かった．さらに，加工計画計画のアルゴリズムについて，六脚ロボットを前提として加工経路計画法を複数提案し，経路計画による造形精度への影響について実験を行った．この実験の成果は，国際会議（JSST2023）で発表した．

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  • Design Optimization for New Functional Structures Fabricated by FRP-AM

    Grant number：21J10589  2021.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

    Koki Jimbo

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    Authorship：Principal investigator 

    Grant amount：\1500000 （ Direct Cost: \1500000 ）

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Teaching Experience

  • Design Engineering 2 & Exercises

    2025.4 Institution：Meiji University

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  • Mechanical Engineering Informatics Drawing 1

    2025.4 Institution：Meiji University

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  • Applied Mechanics Ⅰ with Exercise

    2023.4 - 2024.7 Institution：Tokyo Denki University

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  • Mechatronic Systems Design 2

    2022.9 Institution：Meiji University

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  • Experiment and Practice of Mechanical EngineeringI・ Ⅱ

    2022.4 - 2025.3 Institution：Tokyo Denki University

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  • Strength of Materials Ⅰ

    2022.4 - 2024.7 Institution：Tokyo Denki University

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