Article
Engineering, Industrial
Chenxiang Zhang, Zhengyang Xu, Jiangwei Lu, Tianyu Geng
Summary: DF-ECDD is a compound machining method that combines electrical discharge machining (EDM) and electrochemical machining (ECM) simultaneously, reducing the stray electric field distribution on the workpiece surface. The conductivity of the external flushing liquid affects the stray current and stray corrosion areas on the workpiece surface, leading to the elimination of stray corrosion with the DF-ECDD process.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Tianyu Geng, Zhengyang Xu, Chenxiang Zhang, Jin Ning
Summary: This study compares and analyzes the processing waveform characteristics of EDD and ECDD, and proposes a novel breakthrough detection method based on the variance signal of average voltage (VSAV) to increase machining stability and achieve fabrication without a recast layer. Experimental results show that the method achieves breakthrough detection with 100% accuracy in all tests and obtains the optimum overfeeding distances for hole angles of 0°, 30°, and 60°, realizing stable removal of the recast layer.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Automation & Control Systems
Yi Xu, Baoyang Jiang
Summary: Electrochemical discharge machining (ECDM) is a technology used for micromachining of non-conductive materials, but deep micro hole drilling encounters problems due to bubble accumulation at the entrance hole; recent research shows that improving electrolyte circulation through the magnetohydrodynamic effect can enhance machining efficiency.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Hyeon-Min Lee, Jung-Hyun Choi, Seung-Jae Moon
Summary: In this study, the machining characteristics of glass substrates containing chemical components were investigated for femtosecond laser helical drilling. The research found that the drilling conditions for each glass substrate were affected by its chemical components, particularly the percentage of Al(2)O(3) and MgO components. Increasing the percentage of Al(2)O(3) and MgO components in the glass substrates resulted in a decrease in ablation threshold energy and greater vertical speed of the laser head.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Tianyu Geng, Zhengyang Xu, Jiangwei Lu, Wuhui Wang, Chenxiang Zhang
Summary: This paper introduces a novel method for electrochemical discharge drilling called backflushing ECDD (BF-ECDD), which improves the flow field near the hole wall by the flow of backflushing liquid, solving the problems of instability and poor surface quality caused by liquid shortage. Experimental results demonstrate the feasibility and effectiveness of this method.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Electrochemistry
Mandana Ghasemiansafaei, Florian Schaefer, Thomas Hall, Dirk Baehre
Summary: Electrochemical machining (ECM) is an important technology for machining difficult-to-cut materials. This study investigates the tool damages observed during pulsed electrochemical machining (PECM) and considers three hypotheses: hydrogen embrittlement, cavitation erosion, and cathodic corrosion. The study experimentally examines tool changes in ECM and PECM using aqueous NaNO3 electrolyte and identifies cathodic corrosion as a potential cause. However, further investigation is needed. The study demonstrates the importance of analyzing the microstructure of the tool before and after ECM and PECM to understand the phenomena occurring during these processes.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Hua Zhang, Peng Gao, Jiawen Xu, Lixin Yuan
Summary: The research shows that LD-JECM has high potential for micro-hole precision machining on difficult-to-machine materials, and high quality surfaces and high forming accuracy can be obtained within an optimized process parameters window.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Tianyu Geng, Zhengyang Xu, Jiangwei Lu
Summary: This study proposes an external cryogenic airflow-assisted electrochemical discharge drilling (ECDD) method, which achieves green machining without a recast layer by using a glycol working fluid instead of an acidic solution or spark oil. Experimental results demonstrate that the cryogenic environment enhances the passivation effect, significantly reduces stray corrosion, and achieves exceptionally high surface quality.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Electrochemistry
Yulei Li, Yong Yang, Yufeng Wang, Wenwu Zhang
Summary: Manufacturing microgrooves is urgent due to the increasing application of difficult-to-machine materials and strict surface quality requirements. In this study, a laser-assisted electrochemical machining method using an optical fiber-based tool electrode (LAECMOF) was proposed. The method utilizes an optical fiber to transmit laser to the machining area, with characteristics of laser intensity distribution at the outlet studied. The performance of LAECMOF, including processing dimension, surface roughness, and materials removal rate (MRR), was experimentally studied.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Engineering, Mechanical
Mohammad Jahedol Islam, Yan Zhang, Liang Zhao, Wentao Yang, Haowen Bian
Summary: Electrochemical discharge machining (ECDM), a non-traditional micromachining method, is widely used due to its ability to machine both conductive and non-conductive materials. This study investigates the mechanism by which the tool wear rate (TWR) becomes higher than the material removal rate (MRR) in ECDM. The type and concentration of the salt solution, pulse interval, and energy are explored, and three processes in the machining area are observed. The results show that the expansion of the plasma channel is the key to the switch in the wear mechanism.
Article
Chemistry, Physical
Jing Ni, Xiaotian Zeng, M. S. H. Al-Furjan, Huijun Zhao, Liming Guan, Zhi Cui, Lidong Han
Summary: This paper investigates the drilling performance of polytetrafluoroethylene (PTFE). It suggests that higher spindle speeds with lower feed rates are ideal parameters for improving the drilling performance and machining quality of PTFE. The temperature differences due to different drilling depths and chip accumulation influence surface roughness inconsistencies at various locations in the inner wall of the hole.
Article
Engineering, Mechanical
Mohammad Bagheri, Daniyal Sayadi, Ardeshir Hemasian Etefagh, Mohsen Khajehzadeh, Mohammad Reza Razfar
Summary: The effects of process parameters on the machining of alumina were experimentally studied in this research. The results showed that using ultrasonic vibrations with an amplitude of 34 μm increased the hole depth by 52%.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
M. Schneider, L. Simunkova, A. Michaelis, W. Hoogsteen
Summary: The study focused on the anodic dissolution mechanism of molybdenum and quantification of oxygen evolution as a possible side reaction. It was found that part of molybdenum does not dissolve as Mo6+ in sodium nitrate solution, with an average valency slightly lower than z = 5.5 at pH 1 and z = 5.9 at pH 12.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Engineering, Aerospace
Weijing Kong, Yongbin Zeng, Ziyu Liu, Xiaoyun Hu, Huanghai Kong
Summary: This paper presents a novel hybrid machining technique called helical wire electrochemical discharge machining, which combines wire electrochemical machining with wire electric discharge machining. Experimental results show that the proposed technique can effectively remove the recast layer and improve surface quality. The existence of electrical discharges significantly enhances the transport of the electrolytic products, ensuring high machining efficiency. The technique is demonstrated to be promising for machining large-thickness hard metal materials, as exemplified by the fabrication of mortise structures of Inconel 718 with good machining accuracy and surface quality.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Engineering, Manufacturing
S. Kunar
Summary: This research utilizes maskless microelectrochemical jet machining to produce microtextures on stainless steel surfaces, achieving high-quality micro-patterned samples over large areas through a masked tool movement strategy. High-pressure electrolyte flow through a textured tool is developed to obtain controlled dimensions in the microtextures.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
