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Research on the Mechanism and Key Technology of Precision Grinding of Optical Crystal Materials

Last updated: 2022-11-17

Presentation time: 10:00-11:00, November 19, 2022 (Saturday)

Report form: wechat video live: search "School of Mechanical Engineering, Yanshan University"

Speaker: Qu Meina

Qu Meina is a teacher in the School of Mechanical Engineering, Yanshan University. He graduated from Hunan University, mainly engaged in precision grinding and ultra-fast laser micro/nano machining of difficult materials.

He is currently the first author/corresponding author of the Journal of Materials Processing Technology, Precision Engineering, He has published 6 papers in The International Journal of Advanced Manufacturing Technology and other authoritative journals in the field of mechanical manufacturing, and has authorized 3 invention patents. Presided over 1 open fund of State Key laboratory and 1 enterprise commissioned project; As the backbone of the project, I participated in 3 national projects and 4 projects entrusted by enterprises.

Introduction of the report: Potassium dihydrogen phosphate (KDP) crystal is an irreplaceable key optical component in laser nuclear fusion ignition device. However, it is recognized as a difficult material to process due to its easy deliquescent in water, soft and brittle texture. In order to solve the problems such as large removal margin, low efficiency of single-point diamond precision turning, and easy wear of turning tools, precision grinding technology is proposed to replace precision turning technology in the preparation of KDP crystal optical elements. Through the grindability test and precision grinding test of KDP crystal, it is proved that precision grinding can obtain the same processing quality as precision turning, and effectively improve the processing efficiency. At the same time, aiming at the heat transfer problem in the grinding process, a dynamic quasi-steady state/instantaneous grinding temperature field model of the orthogonal anisotropic material was established, and the accuracy of the model was verified by the grinding temperature experiment. The heat transfer mechanism in the grinding process of KDP crystal was revealed, which provided a theoretical basis for the controllable grinding process of KDP crystal.

School of Mechanical Engineering, Yanshan University

17 November 2022