It is our great pleasure to have you at the 2023 9th International Forum on Manufacturing Technology and Engineering Materials (ICMTEM 2023), which took place in Shenyang, China from December 15th to 17th, 2023. ICMTEM 2023 was successfully held and received unanimous praise from various experts and scholars all over the world.ICMTEM 2023 existed as an international forum for academic communications between experts and scholars in the fields of Manufacturing Technology and Engineering Materials. It promoted the research and developmental activities in related fields and scientific information interchange among all the participants, establishing connections for them to find global partners for potential collaboration.After months of well preparation and hard work, the Proceedings of ICMTEM 2023 covering a bunch of papers, having been checked through rigorous review processes to meet the requirements of publication, are smoothly published. These papers feature but are not limited to the following topics: Electronic Materials, Advanced Forming Manufacturing and Equipment, Industrial Robotics and Automation, Dynamic Mechanical Analysis, Optimization and Control, etc.We had about 150 participations both as speakers and participants, including researchers, industrial experts, teachers, students, and other practitioners. During the keynote speech part, each keynote speaker was given 30 – 40 minutes for keynote speech. The keynote speakers include Professor Yunqing Rao (Huazhong University of Science and Technology, China), Professor Jiang Guo (Dalian University of Technology, China), Professor Zidong Wang (University of Science and Technology Beijing, China), and Professor Shahid Hussain (Jiangsu University, China). They shared their own research experience and special insights by presenting their research achievements, triggering heated and interesting discussions and a good number of informal talks among all the participants.We would like to express our gratitude to the conference organizers, keynote speakers, authors, and all the participants of ICMTEM 2023, for their fruitful work and contribution to the success of the Conference. We are thankful to all the reviewers for providing constructive criticisms, stimulating comments and suggestions to the authors. Particularly, our special thanks go to Journal of Physics: Conference Series, for the endeavor of all its colleagues in publishing this paper volume.May this event be a spark that ignites many more new applications and inventions in the fields of and related to manufacturing technology and engineering materials!The Committee of ICMTEM 2023List of Committee Member is available in this pdf.