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RISS 인기검색어
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- 저자 : Xuelong Wen (검색결과 6 건)
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Xuelong Wen,Yadong Gong,Chao Wang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.12
Micro mill-grinding is a novel compound machining process. This article presented a novel micro mill-grinding tool fabricated by cold spray technology. Compound tools with various grit sizes were used in sidewall machining and slotting. It is proved the effect of micro mill-grinding is better in sidewall machining. The machined surface topography and roughness were measured and the results were compared with those of micro milling. It shows that the smaller the grit size is, the smaller the surface roughness is, and the surface textures by compound tools also get tinier and denser with the decrease of the grit size. The influences of processing parameters on sidewall machining were investigated. It is found that surface roughness increases with the increase of cutting depth and feed rate, but decreases with the increase of spindle speed. The plastic deformation was found in the experiments by different machining methods, but there was no microstructure alternation. The plastic deformation of the specimen surface layer is smaller with the high cutting speed and slow feed speed in micro mill-grinding. The microhardness of the processed surface in micro milling-grinding is larger than that in micro-milling. The major wear mode of the micro mill-grinding tools is grit shedding or coating peeling off.
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Xuelong Wen,Fengbing Han,Yadong Gong 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
In this paper, coated micro-grinding tools with high wear resistance are successfully manufactured by vacuum multi-arc ion plating method, aiming at improving the grinding performance and prolonging the service life of micro-grinding tools. The principle of vacuum multi-arc ion plating is analyzed. Single factor coating experiment is conducted on the surface of specimens to investigate the effect of different preparation parameters on coating properties. It demonstrated during the present research that the interfacial reaction between metal titanium coating and diamond abrasive particles produces metallurgical bond. Meanwhile, the interpenetration between titanium coating and cobalt and nickel binder layer improves the binding force of the coating, which can firmly wrap diamond particles and slow down the shedding of diamond abrasive particles. When the arc current is 100 A, the voltage of the electromagnetic coil is 20 V and the deposition time is 2.5 h, coating properties with high wear resistance can be obtained.
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Yadong Gong,Yunguang Zhou,Xuelong Wen,Jun Cheng,Yao Sun,Lianjie Ma 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.7
Nickel-based single crystal superalloy has no grain boundary, which leads to the removal mechanism difference between single crystal material and polycrystalline material. Firstly, the removal mechanism of grinding nickel-based single crystal superalloy is analysed. Then, the developed prediction model of the tangential force F t and the normal force F n are established. Forthermore, the impacts of grinding parameters on grinding force and microstructure of grinding surface and sub-surface are analysed. Finally, some measurements to reduce or prevent recrystallization are proposed. As a result, the most shear slipping planes of nickel-based single crystal superalloy are {111} planes; with the increasing of the feeding rate and grinding depth, the micro-grinding force and the thickness of subsurface plastic deformation increase; the micro-grinding force and the thickness of subsurface plastic deformation decrease with the increasing of spindle speed. These results have some theoretical and engineering significance to the production of single crystal material parts.
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Longitudinal Dynamic End Effect of Single-Sided Linear Induction Motor for Medium–Low Speed Maglev
Wang Ying,Liu Xuelong,Lu Weiguo,Wen Tianqi,Yu Fan,Wu Qian 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
The Short Primary Single-sided Linear Induction Motor (SLIM) applied in medium–low maglev vehicle has end eff ect that will cause a signifi cant reduction of train thrust. This paper analyzes the relationship between the Longitudinal Dynamic End Eff ect (LDEE) and the speed of SLIM. It is concluded that LDEE increases with the motor speed. The LDEE at motor’s exit area is called tailing eff ect. We take advantage of the tailing eff ect between adjacent SLIMs to make the air-gap magnetic fi eld of these motors continuous by adjusting their intervals and excitation phase diff erence. The several SLIM on the same side of the vehicle is equivalent to a “whole motor” with overall one entry area and one exit area. This method can reduce the resistance of the whole vehicle running at high speed, which can provide a new solution for the design of high-speed SLIM applied in Maglev
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Qi Gao,Yadong Gong,Yunguang Zhou,Xuelong Wen 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1
Micro-milling is widely used as a method for machining of micro-parts with high precision and efficiency. Taking the nickel-based single-crystal superalloy DD98 as the research object, the crystal characteristics of single-crystal materials were analysed, and the removal mechanism of single-crystal micro-milled parts was described. Based on molecular dynamics, a simulation model for nickel-based single-crystal superalloy DD98 micro-milling was established. Based on the response surface method of central composite design, the influences of spindle speed, feed rate, and milling depth on the surface roughness were examined, and a second-order regression model of the DD98 surface roughness was established. Using analysis of variance and the residuals of the model, a significant influence on surface roughness was found in the following order from large to small: Feed rate, spindle speed, and milling depth. Comparisons were conducted between the micro-milling experimental values and the predicted model values for different process parameters. The results show that the model fit is relatively high, and the adaptability is good. Scanning electron microscopy analysis of the micro-milling surfaces was performed to verify the slip and the removal mechanism of single-crystal materials. These results offer a theoretical reference and experimental basis for micro-milling of single-crystal materials.
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가열건조법에 의한 단위수량 추정에 미치는 혼화재료의 영향
문학룡 ( Wen¸ Xue-long ),김영득 ( Kim¸ Young Deuk ),황인성 ( Hwang¸ Yin-seong ),한천구 ( Han¸ Cheon-goo ),김광서 ( Kim¸ Kwang Soe ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This study is intended to investigate the influence of admixture factor on estimation of water content in fresh concrete. According to the results, as the replacing ratio of blast furnace slag powder and fly ash increases, the difference between designed and estimated water content by heat drying method grows small before correction, but water content is estimated favorably in the range of ± 5kg/m<sup>3</sup>, compared with designed water content after correction. Estimated water content shows the difference of 20~30kg/m<sup>3</sup> with increase of AE agent in comparison with designed water content before correction, but it is similar to designed water. As the mixing ratio of AE agent increases, water content is estimated less than designed water content with increase of air content.
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