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Experimental study on high-efficiency polishing for potassium dihydrogen phosphate (KDP) crystal by using two-phase air-water fluid

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Frontiers of Mechanical Engineering 2020年第2期15卷 294-302页

作者： Ziyuan LIU Hang GAO Dongming Guo Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China

A high-efficiency polishing approach using two-phase air–water fluid(TAWF)is proposed to avoid surface contamination and solve the inefficiency of previous water-dissolution polishing techniques for potassium dihydrogen phosphate(KDP)crystal.In the proposed method,controllable deliquescence is implemented without any chemical impurity.The product of deliquescence is then removed by a polishing pad to achieve surface planarization.The mechanism underlying TAWF polishing is analyzed,a special device is built to polish the KDP crystal,and the effect of relative humidity(RH)on polishing performance is studied.The relationship between key parameters of polishing and surface planarization is also investigated.Results show that the polishing performance is improved with increasing RH.However,precisely controlling the RH is extremely difficult during TAWF polishing.Controllable deliquescence can easily be disrupted once the RH fluctuates,which therefore needs to be restricted to a low level to avoid its influence on deliquescence rate.The material removal of TAWF polishing is mainly attributed to the synergistic effect of deliquescence and the polishing pad.Excessive polishing pressure and revolution rate remarkably reduce the life of the polishing pad and the surface quality of the KDP crystal.TAWF polishing using IC-1000 and TEC-168S increase the machining efficiency by 150%,and a smooth surface with a root mean square surface roughness of 5.5 nm is obtained.

关键词： potassium dihydrogen phosphate(KDP)crystal controllable deliquescence two-phase air–water fluid high-efficiency polishing material removal

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Foreword for the inaugural issue

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International Journal of Extreme Manufacturing 2019年第1期1卷 1-2页

作者： Dongming Guo Yongfeng Lu Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianPeople’s Republic of China University of Nebraska-Lincoln LincolnNE 68588United States of America

The International Journal of Extreme Manufacturing is a leading,worldwide scientific journal focused on the fields of extreme manufacturing.Published within it are the latest scientific and engineering achievements in... 详细信息

关键词： journal extreme technological

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Special issue： Ultra-precision machining

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Frontiers of Mechanical Engineering 2017年第1期12卷 1-2页

作者： Zhuangde JIANG Dongming Guo State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and MeasurementTechnologies Collaborative Innovation Center of Suzhou Nano Science and Technology School of Mechanical Engineering Xi'an JiaotongUniversity Xi'an 710049 China Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian 116024China

This special issue in Frontiers of Mechanical Engineering contains seventeen papers contributed by prestigious experts from five countries, including one prospect paper, four research papers and twelve review papers. These papers cover a broad area of the ultra-precision machining, and focus on the recent advances on a wide variety of machining methods, such as precision molding, figuring, milling, lapping and diamond machining, to illustrate how various materials in the macro-scale or micro-scale can be machined with high precision, low surface^subsurface damage and ultra-smooth surfaces to meet the demands of numerous application areas, including high-power laser systems, consumer electronics, flexible devices, etc. Some other hot topics, such as the measurement and simulation technology in the ultra-precision machining field, are also covered to provide the readers with a more comprehensive view.

关键词： Special Ultra precision machining

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Comparison of surface integrity for dry and wet drilling of 49Fe-49Co-2V alloy

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Chinese Journal of Aeronautics 2022年第6期35卷 325-338页

作者： Yuan ZHANG Zhigang DONG Yan BAO Renke KANG Xin HUANG Dongming Guo Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education School of Mechanical EngineeringDalian University of TechnologyDalian 116024China AVIC Xi’an Flight Automatic Control Research Institute Xi’an 710076China

Working performances of the components made out of 49Fe-49Co-2V alloy are closely related to the surface integrity of the drilled holes,which are influenced remarkably by the cooling conditions.The present study focuses on the surface integrity differences between wet and dry drilled 49Fe-49Co-2V alloy holes.The drilled hole surface roughness and topographies,metallurgical and mechanical properties,and the exit characterizations were obtained using optical microscopy(OM),scanning electron microscopy(SEM),electron backscatter diffraction microscopy(EBSD),transmission electron microscopy(TEM),energy dispersive spectroscopy(EDS)and Vickers hardness techniques,etc.The effects of cooling conditions on the surface integrity were concluded and the influence mechanisms were analyzed based on the force and temperature differences in drilling process with different cooling conditions.It is found that the surface roughness and the thickness of refined-grain region of the dry drilled holes are larger than those of wet drilled holes;work hardening induced by wet drilling is more serious than dry drilling;chippings occurred in the exits of the wet drilled holes due to the material brittleness,which could be avoided by dry drilling.The surface integrity differences of wet and dry drilled holes are closely related to the force and temperature differences in drilling process with different cooling conditions.

关键词： 49Fe-49Co-2V alloy Cooling condition Drilling Exit chipping Microstructure Surface integrity Surface quality Work hardening

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高性能制造

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机械工程学报 2022年第21期58卷 225-242页

作者：郭东明大连理工大学精密与特种加工教育部重点实验室大连116024

随着应用空间的不断拓展和服役性能的不断提升,航空航天、能源动力、信息电子等领域对高端装备的需求迫切。这些高端装备以承载、传导、换能、隐身等性能的精准保证为主要制造目标,不仅性能要求高,且往往结构复杂、材料难加工、表面完... 详细信息

随着应用空间的不断拓展和服役性能的不断提升,航空航天、能源动力、信息电子等领域对高端装备的需求迫切。这些高端装备以承载、传导、换能、隐身等性能的精准保证为主要制造目标,不仅性能要求高,且往往结构复杂、材料难加工、表面完整性或精度要求极高,制造难度极大。高性能制造是应对上述挑战,突破高端装备制造瓶颈的必然选择。从高端装备及其零件/部件/构件/器件(简称零件)的特点、制造要求和制造技术的现状出发,阐明了高性能制造的内涵、所需要探究的基础问题以及设计与制造环节的定量关联关系,建立了高性能制造的总体框架和模型表达形式,分析了高性能制造应注意的要素和应遵循的规律,给出了高性能制造的实现途径、关键技术和两个应用实例,并指出高性能制造是以性能为第一目标,设计、制造、使役等多参量关联关系建模为核心的科学、精准和最适宜的制造,也是数字化和可计算的制造,亦是以性能的精准保证为目标的性能与几何结构一体化制造。

关键词：高性能制造精密制造制造模式预测建模仿真优化

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Machining the Integral Impeller and Blisk of Aero-Engines:A Review of Surface Finishing and Strengthening Technologies

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 528-543页

作者： Youzhi Fu Hang Gao Xuanping Wang Dongming Guo key laboratory for precision and non-traditional machining technology of ministry of education dalian university of technologyDalian 116024China

The integral impeller and blisk of an aero-engine are high performance parts with complex structure and made of difficult-to-cut materials. The blade surfaces of the integral impeller and blisk are functional surfaces for power transmission, and their surface integrity has signif- icant effects on the aerodynamic efficiency and service life of an aero-engine. Thus, it is indispensable to finish and strengthen the blades before use. This paper presents a comprehensive literature review of studies on finishing and strengthening technologies for the impeller and blisk of aero-engines. The review includes independent and inte- grated finishing and strengthening technologies and dis- cusses advanced rotational abrasive flow machining with back-pressure used for finishing the integral impeller and blisk. A brief assessment of future research problems and directions is also presented.

关键词： Integral impeller and blisk Aero-engine Surface integrity Surface finishing Surface strengthening

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Research progress on ultra-precision machining technologies for soft-brittle crystal materials

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Frontiers of Mechanical Engineering 2017年第1期12卷 77-88页

作者： Hang GAO Xu WANG Dongming Guo Yuchuan CHEN Key Laboratory for Precision and Non-traditional Machining Technol-ogy of Ministry of Education Dalian University of Technology Dalian116024 China

Soft-brittle crystal materials are widely used in many fields, especially optics and microelectronics. However, these materials are difficult to machine through traditional machining methods because of their brittle, soft, and anisotropic nature. In this article, the characteristics and machining diff^culties of soft-brittle and crystals are presented. Moreover, the latest research progress of novel machining technologies and their applications for soft- brittle crystals are introduced by using some representative materials （e.g., potassium dihydrogen phosphate （KDP）, cadmium zinc telluride （CZT）） as examples. This article reviews the research progress of soft-brittle crystals processing.

关键词： brittle soft functional crystal ultra-precisionmachining

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Advances in molecular dynamics simulation of ultra-precision machining of hard and brittle materials

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Frontiers of Mechanical Engineering 2017年第1期12卷 89-98页

作者： Xiaoguang guo Qiang LI Tao LIU Renke KANG Zhuji JIN Dongming Guo Key Laboratory for Precision & Non-traditional Machining of Ministryof Education Dalian University of Technology Dalian 116024 China

Hard and brittle materials, such as silicon, SiC, and optical glasses, are widely used in aerospace, military, integrated circuit, and other fields because of their excellent physical and chemical properties. However, these materials display poor machinability because of their hard and brittle properties. Damages such as surface micro-crack and subsurface damage often occur during machining of hard and brittle materials. Ultra-precision machining is widely used in processing hard and brittle materials to obtain nanoscale machining quality. However, the theoretical mechanism underlying this method remains unclear. This paper provides a review of present research on the molecular dynamics simulation of ultra-precision machining of hard and brittle materials. The future trends in this field are also discussed.

关键词： MD simulation ultra-precision machining,hard and brittle materials machining mechanism review

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Overview of extreme manufacturing

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International Journal of Extreme Manufacturing 2019年第2期1卷 1-9页

作者： Dongming Guo Yongfeng Lu Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianPeople’s Republic of China University of Nebraska-Lincoln LincolnNE 68588United States of America

1.Introduction Today we live in a new era of economic globalization and rapid technological growth.The advancement of both our society and standard of living require us to delve into this new world and unleash the possibilities our future.We need to broaden the horizons of our universe to discover a new realm where the future of humanity can flourish.We need to be unafraid to unveil the mysteries hidden within the depths of our oceans to unearth treasures that will benefit not only us,but the generations to come.To fulfill this vision,we must manufacture extremely large and extraordinarily fast equipment that will function seamlessly under the duress of extreme environments.On the other hand,matter is infinitely divisible.

关键词： extreme infinitely universe

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Special issue： Near-net shaping technology

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Frontiers of Mechanical Engineering 2018年第1期13卷 1-2页

作者： Dequn LI Dongming Guo Qingxue HUANG Yanchun LOU State Key Laboratory of Material Processing and Die & Mold Technology Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory for Precision & Non-traditional Machining of Ministry of Education Dalian University of Technology Dalian 116024 China Heavy Machinery Engineering Research Center of Education Ministry Taiyuan University of Science and Technology Taiyuan 030024 China Shenyang Research Institute of Foundry Shenyang 110022 China

Near-net shaping is an efficient, economical and environmentally-friendly approach to manufacture products which are very close to the final shape, reducing the need for surface finishing. It has become more and more important to use raw materials and energy in an optimal way. Near-net shaping technology has attracted increasing attention in both academic and industrial communities, especially in China, because China has become the world＇s largest regional market for main material forming methods, such as casting, forging and injection molding. The main objective of this special issue in Frontiers of Mechanical Engineering is to bring together the leading ideas, experience and research results of academic scientists and researchers on various aspects of near-net shaping technology. This special issue contains eleven papers contributed by prestigious experts from different countries, including four reviews and seven research articles. These papers cover a broad area of the near-net shaping technology,

关键词： Injection molding casting-forging Material forming raw material Forged Energy sources Casting Surface finish

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