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RISS 인기검색어
- 검색키워드
- 저자 : Guangxi Zhao (검색결과 3 건)
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Experimental analysis of component morphology by fused coating process
Guangxi Zhao,Zhengying Wei,Jun Du,Yunfei Yao,Wei Liu,Xin Wang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Fused coating process is a novel method for additive manufacturing technology, which has greatly reduced the cost and improved the efficiency. A series of experiments were carried out with the orthogonal method using pass width and height to evaluate. The order of factors influence degree on width and height were figured out, and it’s found that the air pressure at the top of the nozzle is the most influential. The morphologies of single passes at different temperatures were measured and fitted separately with parabola, circular arc and cosine function, and the goodness of fit was compared and analyzed, based on which the overlapping models were investigated. Four kinds of overlapping patterns were mentioned for the single-layer multi-pass model. The relationship between central distance of adjacent layers and overlapping patterns was calculated out. Furthermore, experimental pieces with suspended structure were processed without supporting material. It is found that when the tilt angle is smaller than 40° the inclined thin wall will collapse.
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Fan Chen,Guojian Mei,Bo Zhao,Wenbo Bie,Guangxi Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
Three-dimensional (3D) ultrasonic vibration-assisted ELID grinding, which combines 3D ultrasonic vibration-assistance with electrolytic in-process grinding wheel dressing (ELID), is a compound process that is designed to achieve high-efficiency precision machining. A grinding force model of 3D ultrasonic vibration-assisted ELID grinding was first developed on the basis of the kinematics of a single grit particle and was verified through experimentation. The surface quality then was observed using white light interference profiling. It was demonstrated during the present investigation that the grinding force during 3D ultrasonic vibration-assisted ELID grinding was approximately 20 %~30 % lower than that of twodimensional (2D) ultrasonic vibration-assisted ELID grinding. In addition, the surface roughness (Ra) achieved during 3D ultrasonic vibration-assisted ELID grinding was approximately 40 %~50 % smoother than was achieved under 2D ultrasonic vibration-assisted ELID, and thus 3D ultrasonic vibration-assisted ELID grinding can achieve better surface quality.
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Wang Xin,Du Jun,Wei Zhengying,Zhang Shan,Zhao Guangxi,Ren Chuanqi,Bai Hao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.2
In order to achieve good interlayer metallurgical bonding in the metal fused-coating additive manufacturing, the finite element thermal analysis model was established and the influences of different heating temperatures of fused coating nozzle and substrate on the interlayer remelting was analyzed. The maximum remelting depth under different temperature conditions was obtained. The multi-layer forming experiments were performed under different temperature conditions, and the results showed that increasing the heating temperature of nozzle or substrate will effectively increase the remelting depth, that the surface forming quality is better when the remelting depth is in the range of 0.1~0.2 mm, and that the deviation between the remelting depth and the calculated value is less than 15 %. So, the model can predict the remelting depth of the intermetallic microstructure.
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