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Experimental investigation on the deflection of a serpentine spring machined by WEDM
Mancang Song,Jie Wang,Yang Li,Junshan Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.12
A kind of micro serpentine spring by wire electrical discharge machining (WEDM) is selected as research object, and the bending deformation mechanism of serpentine spring during cutting was discussed. Then a method of reducing the bending deformation of the micro serpentine spring was studied. The results demonstrate that the resultant force of the serpentine spring is attractive force. The degree of deformation is closely related to the material and the deformation of pure copper is smallest, so it is also a good choice to choose alternative materials. The deformation angle of the serpentine spring was reduced from 16.2° to 3.6° by establishing the supporting structure, changing the cutting trajectory, using multi-cutting and stress relief annealing methods. The bending deformation of the serpentine spring was significantly improved, which provided a new method for the processing of mechanical micro structures or devices.
Shi Yihan,Zhang Ming,Zhao Junshan,Zhang Liu,Cui Xumei,Zhu Xinhua,Jin Dandan,Gong Jiali,Yang Dingyu,Li Jitao 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.5
This work used a simple electrochemical reduction method to secondary construct the reduced nickel base (rNi Base) on nickel foam with a nano-core structure. The secondarily constructed base has a large specific surface area, which can increase the mass utilization of the active material. The rNi Base was used as a base for the reduction of nickel on Na+, K+, and NH+4, respectively. MnO2 was electrodeposited under three different cation pre-intercalation treatments, and the mechanism of the effect of different monovalent cations to guide the growth of MnO2 materials was investigated. Finally, rNi/MnO2&Na+ electrode with a special nano cauliflower structure was obtained. The special nanostructure of the electrode enhances its electrochemical performance, possessing 598 F g− 1 ultra-high specific capacitance at a current density of 1 A g− 1 and a high specific capacitance of 307.5 F g− 1 at a high current density of 20 A g− 1, and high specific capacitance maintenance rate of 92.7% after 500 cycles of charging and discharging at a current density of 2 A g− 1. In addition, the symmetrical supercapacitor assembled with this electrode has a very high specific capacitance (401.1 F g− 1 at a current density of 1 A g− 1) and energy density (80.22Wh kg− 1 at a power density of 599.99 W kg− 1).