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学者姓名：陈东菊
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Abstract ：
This paper investigates the correlation between the surface quality and the cross-sectional quality, microstructure, internal defects, and mechanical properties of specimens formed by selective laser melting (SLM) under different scanning speeds and scanning intervals. Therefore, different machining parameters were chosen to prepare titanium alloy specimens by SLM technique. The surface morphology of the specimens was characterized using a light microscope, and the surface quality, microstructure, internal defects, and deep connection of the mechanical properties of the specimens formed under different parameters were investigated. In addition, numerical simulation of the melt pool morphology under different scanning speeds was used. The results show that there is a strong correlation between the surface quality of the specimen and the section quality and mechanical properties. When the scanning speed is 350 mm/s, the surface roughness is 14.7 mu m, the density is 99.99%, the tensile strength and yield strength are 1209 and 1151 Mpa respectively, and the surface quality, cross-sectional quality and mechanical properties all tend to deteriorate as the scanning speed increases. When the scanning interval is 0.11 mm, the mechanical properties of surface quality and cross-sectional quality are optimal, the surface roughness is 14.5 mu m, and the density reaches 99.99%, at this time, the microscopic needle martensite alpha ' phase is uniformly distributed and refined, and its mechanical properties are optimal, the tensile strength is 1239 MPa, and the internal hole defects are less. Numerical simulations of a single track melt pool show that the depth of depression caused by the recoil pressure is larger and the melt pool is deeper when the scanning speed is 350 mm/s. Therefore, it has better fluidity and ductility. Simulation results of the double tracks show that when the scanning interval is 130 mu m, a large amount of incompletely melted powder at the midline of the double track does not lap well, which leads to the formation of pore defects inside the specimen. The above simulation results are highly consistent with the surface quality of the specimens during the experiments, which provides a guide to analyze the connection between the melt pool evolution and the Ti6Al4V molding quality.
Keyword ：
mechanical properties mechanical properties selective laser melting selective laser melting surface quality surface quality internal defects internal defects
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| GB/T 7714 | Chen, Dongju , Li, Gang , Wang, Peng et al. Study on the mechanism of correlation between surface quality and tissue properties of Ti6Al4V alloy formed by selective laser melting [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2024 , 239 (2) : 449-464 . |
| MLA | Chen, Dongju et al. "Study on the mechanism of correlation between surface quality and tissue properties of Ti6Al4V alloy formed by selective laser melting" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 239 . 2 (2024) : 449-464 . |
| APA | Chen, Dongju , Li, Gang , Wang, Peng , Tang, Yuhang . Study on the mechanism of correlation between surface quality and tissue properties of Ti6Al4V alloy formed by selective laser melting . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2024 , 239 (2) , 449-464 . |
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Abstract ：
To reveal the influence of the different types of surface microtexture on the performance of hydrostatic bearing, microtexture (square, cylindrical, and composite texture) on the inner surface of the bearing were designed. The finite element model of bearing with textures was established. Under the condition of considering the cavitation effect, the influence of the different types of microtexture on performance of the bearing is studied based on the N-S equation. The SEA9 spindle rotation error analyzer is used to determine the eccentricity of the spindle in the machining process and to verify the accuracy of the theoretical simulation. The results demonstrates that the microtexture enhances the performance of hydrostatic bearing, when the eccentricity is in the range of 0 similar to 0.3, compared with square, cylindrica, and smooth bearing, the performance of composite texture bearing can effectively improve the load capacity and reduce the friction coefficient. When the eccentricity is larger than 0.3, the partial textured bearing is analyzed. The initial angle is 120 degrees, the load capacity of the partial microtextured bearing are greater than full microtextured bearing and smooth bearing, which can be used to improve the performance of the bearing. The optimal combination of structural parameters for the performance of the partial composite texture is provided, which has important theoretical significance and practical value for expanding the application range of the spindle system.
Keyword ：
full microtexture full microtexture Hydrostatic bearing Hydrostatic bearing eccentricity eccentricity partial microtexture partial microtexture dynamic pressure effect dynamic pressure effect
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| GB/T 7714 | Chen, Dongju , Zhao, Yupeng , Sun, Kun et al. Performance evaluation and comparison of different types of full and partial texture of hydrostatic bearings [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING , 2024 . |
| MLA | Chen, Dongju et al. "Performance evaluation and comparison of different types of full and partial texture of hydrostatic bearings" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING (2024) . |
| APA | Chen, Dongju , Zhao, Yupeng , Sun, Kun , Tang, Yuhang , Cheng, Kai . Performance evaluation and comparison of different types of full and partial texture of hydrostatic bearings . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING , 2024 . |
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Abstract ：
Milling-based micro-texturing is an emerging technique that employs mechanical milling to create precise and flexible surface patterns, enabling controlled surface property modulation. With high precision, controllability, repeatability, and mass production, it finds extensive applications in optics, biomedical engineering, mechanical engineering, and among others. Herein, this paper systematically summarizes the key contents of micro-texturing technology from the perspective of mechanical milling for the first time. Firstly, the surface texture generation mechanisms are systematically described, encompassing milling forces modeling, texture formation process, and size effect. Secondly, the importance of tool selection and manufacturing in micro-milling is briefly addressed, followed by a detailed classification and comparison of existing milling-based micro-texturing techniques for metallic and non-metallic materials. Subsequently, the design criteria of surface micro-texturing, methods for characterizing its performance, and typical applications of this technology are summarized in detail. Finally, a brief summary and outlook for future work are delineated. This research is expected to facilitate the enhancement of surface performance, the development of functional materials, and the exploration of novel applications in response to ultra-precision manufacturing demands.
Keyword ：
Typical applications Typical applications Surface texture generation mechanism Surface texture generation mechanism Performance characterization Performance characterization Milling-based micro-texturing Milling-based micro-texturing
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| GB/T 7714 | Jiang, Zhiwen , Chen, Dongju , Sun, Kun et al. A systematic review of micro-texture formation based on milling: from mechanism, existing techniques, characterization to typical applications [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 134 (5-6) : 2151-2177 . |
| MLA | Jiang, Zhiwen et al. "A systematic review of micro-texture formation based on milling: from mechanism, existing techniques, characterization to typical applications" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 134 . 5-6 (2024) : 2151-2177 . |
| APA | Jiang, Zhiwen , Chen, Dongju , Sun, Kun , Pan, Ri , Fan, Jinwei , Tang, Yuhang . A systematic review of micro-texture formation based on milling: from mechanism, existing techniques, characterization to typical applications . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 134 (5-6) , 2151-2177 . |
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Abstract ：
Good lubrication performance plays a vital role in reducing friction and ensuring stable operation of machine tool spindles. The performance of traditional lubricants has reached its limit and cannot meet the needs of the high-speed development of advanced equipment, and nanomaterials have attracted much attention due to their small size and excellent ability to repair defects on metal surfaces. Different nanomaterials, influencing factors, and surface modification methods have been extensively investigated for an in-depth understanding of the tribological performance of nano-lubricants. However, a comprehensive examination of the thorough classification of nano-additives, the revelation of nanoscale lubrication mechanisms, and their potential employs on bearings is lacking. This systematic review comprehensively investigates the types of nano-lubricants, tribological properties, and lubrication mechanisms. Recent advances in various numerical and experimental studies of different nano-lubricants for improving the performance of sliding bearings are summarized. The importance of utilizing nano-lubricants in bearing-rotor systems is emphasized and the limitations and main challenges in applications are analyzed. Future research should be devoted to the development of high-performance nano-lubricants to improve spindle performance and work stability.
Keyword ：
Sliding bearings Sliding bearings Tribological properties Tribological properties Lubrication mechanisms Lubrication mechanisms Nano-lubricant additives Nano-lubricant additives Main challenges Main challenges
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| GB/T 7714 | Li, Jia , Chen, Dongju , Zhang, Hao et al. The tribological properties of nano-lubricants and their application on bearings: recent research progress [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 134 (7-8) : 3051-3082 . |
| MLA | Li, Jia et al. "The tribological properties of nano-lubricants and their application on bearings: recent research progress" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 134 . 7-8 (2024) : 3051-3082 . |
| APA | Li, Jia , Chen, Dongju , Zhang, Hao , Jiang, Zhiwen , Sun, Kun , Fan, Jinwei et al. The tribological properties of nano-lubricants and their application on bearings: recent research progress . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 134 (7-8) , 3051-3082 . |
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Abstract ：
The maximum flexibility direction(MFD) is solved for establishing the deformation estimation criterion of the blade during machining process, and the larger the milling force in MFD, the bigger the deformation of the blade during machining process. A new milling force calculation algorithm based on edge-workpiece-engagement (EWE) is proposed by analyzing the contact process between the ball-end milling tool and the chip. The chip thickness of each tool element of each edge curve at any rotation angle is calculated, the milling force of MFD and SLDs under different inclination angles are calculated. The average absolute milling force in MFD reaches the minimum value of 0.65126N when the lead/tilt angle is 30 degrees/-45 degrees, and the maximum machining efficiency is reached when the lead/tilt angle is 45 degrees/-45 degrees.The optimized tool inclination angle, which is 30 degrees/-45 degrees for lead/tilt angle, is obtained by solving the multi-objective optimization problem of machining deformation represented by relative deformation and machining efficiency represented by relative stable machining area. The effectiveness of the proposed scheme is verified by comparison of simulation and experiment for blade machining error under two kinds of tool orientations.
Keyword ：
Maximum flexibility direction Maximum flexibility direction Machining efficiency Machining efficiency Edge-workpiece-engagement Edge-workpiece-engagement Machining deformation Machining deformation Inclination angles Inclination angles
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| GB/T 7714 | Chen, Dongju , Wu, Shuiyuan , Wu, Jianqiang et al. Tool inclination angle designing for low-deformation and high-efficiency machining of thin-wall blade based on edge-workpiece-engagement [J]. | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2024 , 90 : 21-37 . |
| MLA | Chen, Dongju et al. "Tool inclination angle designing for low-deformation and high-efficiency machining of thin-wall blade based on edge-workpiece-engagement" . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY 90 (2024) : 21-37 . |
| APA | Chen, Dongju , Wu, Shuiyuan , Wu, Jianqiang , Pan, Ri , Fan, Jinwei , Tang, Yuhang . Tool inclination angle designing for low-deformation and high-efficiency machining of thin-wall blade based on edge-workpiece-engagement . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2024 , 90 , 21-37 . |
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Abstract ：
The aerostatic spindle often occur offset and additional vibration under the action of external load due to the low stiffness, thus affecting the rotary accuracy of the spindle. In order to solve the problem of unbalanced vibration of the spindle, a new type of controllable radial aerostatic bearing is designed by combining piezoelectric ceramics. A bearing-rotor-piezoelectric ceramic coupling model was established, and the control method of variable structure sliding mode control was used to reduce the vibration amplitude due to the unbalance. From the results of simulation and experiment, it is found that when the disturbance is taken as a constant value, the vibration amplitude increases with the increase of force; when the disturbance force is an unknown random force, the control effect is slightly worse than that when the disturbance force is known, but the rotary accuracy can be improved by this suppression effect on the aerostatic spindle. Finally, the correctness and effectiveness of this control method are proved through experiments.
Keyword ：
Vibration Vibration Vibration suppression Vibration suppression Piezoelectric ceramics Piezoelectric ceramics Aerostatic spindle Aerostatic spindle Variable structure sliding mode Variable structure sliding mode
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| GB/T 7714 | Chen, Dongju , Wang, Handong , Xie, Yinhui et al. Regulating the vibration of aerostatic journal spindle based on piezoelectric ceramics [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2023 , 85 : 1-8 . |
| MLA | Chen, Dongju et al. "Regulating the vibration of aerostatic journal spindle based on piezoelectric ceramics" . | JOURNAL OF MANUFACTURING PROCESSES 85 (2023) : 1-8 . |
| APA | Chen, Dongju , Wang, Handong , Xie, Yinhui , Liang, Dong . Regulating the vibration of aerostatic journal spindle based on piezoelectric ceramics . | JOURNAL OF MANUFACTURING PROCESSES , 2023 , 85 , 1-8 . |
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Abstract ：
This paper presents an analytical model for identifying process damping caused by interference between tool and workpiece during the cutting process. In contrast to the traditional discrete method, the model identifies the interference area between tool and workpiece using a complete analytical method. The obtained interference area can achieve the accuracy of the result obtained by using a shorter discrete step, but the time required for the model is shorter than that of the discrete method and is unaffected by the discrete step. The influence of tool wear band on the process damping coefficient is also considered. The process damping coefficient is identified based on the interference area obtained by the complete analytical model, and the damping coefficient of the non-linear process is linearized by the energy method. Finally, the cutting stability lobe diagram is drawn considering the influence of process damping, and the cutting stability region is predicted. Compared with the lobe diagram without process damping, it is found that process damping can significantly improve the cutting stability in low-speed cutting, and a series of cutting tests are carried out to verify the correctness of the prediction model.
Keyword ：
Cutting stability Cutting stability Complete analytical method Complete analytical method Stability lobe diagram Stability lobe diagram Process damping Process damping
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| GB/T 7714 | Chen, Dongju , Zhang, Xuan , Li, Shupei et al. A novel process damping identification model and cutting stability prediction [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 126 (9-10) : 4573-4579 . |
| MLA | Chen, Dongju et al. "A novel process damping identification model and cutting stability prediction" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 126 . 9-10 (2023) : 4573-4579 . |
| APA | Chen, Dongju , Zhang, Xuan , Li, Shupei , Pan, Ri , Sun, Kun , Fan, Jinwei . A novel process damping identification model and cutting stability prediction . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 126 (9-10) , 4573-4579 . |
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Abstract ：
以控制工程基础理论课程为例,结合全国高校思想政治工作会议精神,通过挖掘专业教学内容中的育人元素,坚持以学生为中心、以产出为导向、持续改进的教学理念,改革教学方法与考核评价方式,将教学评价与持续改进贯穿课程教学始终等途径,积极探索课程思政在控制工程基础课程中的渗透,切实培养符合新时代需求的自动控制专业技术人才.
Keyword ：
教学模式 教学模式 课程思政 课程思政 控制工程基础课程 控制工程基础课程
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| GB/T 7714 | 陈东菊 , 李佳 . 控制工程基础课程思政教学模式的改革与探索 [J]. | 教育信息化论坛 , 2023 , (19) : 105-107 . |
| MLA | 陈东菊 et al. "控制工程基础课程思政教学模式的改革与探索" . | 教育信息化论坛 19 (2023) : 105-107 . |
| APA | 陈东菊 , 李佳 . 控制工程基础课程思政教学模式的改革与探索 . | 教育信息化论坛 , 2023 , (19) , 105-107 . |
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Abstract ：
A heat-affected zone significantly reduces the mechanical properties of carbon fiber-reinforced plastics (CFRP). However, the beam quality, especially the stability of the beam pointing, limits the heat-affected zone (HAZ) minimization studies. In this study, the HAZ is reduced by improving the pointing stability of the laser beam. A beam pointing stabilization system (BPSS) based on position-sensitive devices and fast steering mirrors (FSMs) was developed. The research focuses on building a control model from the position-sensitive devices' position deviation signals to the FSMs' corrected control angles. The control model can detect and predict the beam pointing deviations and correct the attitudes of the FSMs to correct the beam pointing deviations, improving the beam pointing stability. The performance of the proposed BPSS and the corresponding control model were experimentally verified. The results indicate that the pointing deviations of the corrected beam in the X and Y directions are reduced by 78.08% and 70.28%, respectively. Additionally, the HAZ of CFRP processed with the corrected laser is reduced by 30.8%. The quality of the laser cutting of CFRP is significantly improved.
Keyword ：
carbon fiber-reinforced plastics carbon fiber-reinforced plastics fast steering mirror fast steering mirror beam pointing stability beam pointing stability heat-affected zone heat-affected zone laser processing laser processing
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| GB/T 7714 | Fan, Jinwei , Ren, Xingfei , Pan, Ri et al. Improving laser cutting quality of carbon fiber-reinforced plastics by improving laser beam pointing stability [J]. | OPTICAL ENGINEERING , 2022 , 61 (12) . |
| MLA | Fan, Jinwei et al. "Improving laser cutting quality of carbon fiber-reinforced plastics by improving laser beam pointing stability" . | OPTICAL ENGINEERING 61 . 12 (2022) . |
| APA | Fan, Jinwei , Ren, Xingfei , Pan, Ri , Chen, Dongju , Sun, Kun . Improving laser cutting quality of carbon fiber-reinforced plastics by improving laser beam pointing stability . | OPTICAL ENGINEERING , 2022 , 61 (12) . |
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Abstract ：
The dynamic characteristics of the gas film of an aerostatic spindle primary affect workpiece waviness in ultra-precision machining. To improve the machining accuracy of the machine tool and provide a firm theoretical basis for the design of an aerostatic spindle, a simulation model combining transient computational fluid dynamics (CFD) analysis and transient dynamic analysis is established in this study to investigate the dynamic characteristics of the spindle under unstable operating conditions. Based on a large eddy simulation, a three-dimensional flow model of an air film in an aerostatic spindle is established. The simulation results show that the gas flow in the throttle chamber is turbulent, and that complex vortices are formed. Using dynamic grid modeling technology, a CFD numerical model for the unsteady calculation of the spindle is established, and the dynamic characteristics of the gas film are obtained. A transient dynamic simulation model of an aerostatic spindle is established, and the effect of the nonlinear dynamic characteristics of the gas film on the spindle displacement response is investigated. Subsequently, a surface morphology prediction model is established. Results show that film fluctuation significantly affects the dynamic characteristics of the spindle and subsequently affects the generation of surface ripples on the workpiece.
Keyword ：
Ultra-precision flying cutting Ultra-precision flying cutting Dynamic characteristics Dynamic characteristics Surface formation Surface formation Aerostatic spindle Aerostatic spindle
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| GB/T 7714 | Chen, Dong-Ju , Li, Shu-Pei , Zhang, Xuan et al. Relationship between dynamic characteristics of air film of aerostatic spindle and mid-frequency of surface topography [J]. | ADVANCES IN MANUFACTURING , 2022 , 10 (3) : 428-442 . |
| MLA | Chen, Dong-Ju et al. "Relationship between dynamic characteristics of air film of aerostatic spindle and mid-frequency of surface topography" . | ADVANCES IN MANUFACTURING 10 . 3 (2022) : 428-442 . |
| APA | Chen, Dong-Ju , Li, Shu-Pei , Zhang, Xuan , Fan, Jin-Wei . Relationship between dynamic characteristics of air film of aerostatic spindle and mid-frequency of surface topography . | ADVANCES IN MANUFACTURING , 2022 , 10 (3) , 428-442 . |
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