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- 저자 : Chuanzhen Liu (검색결과 2 건)
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Ch Asad Abbas,Huang Chuanzhen,Huma Hafeez,Li Binghao,Liu Hanlian 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
In this study, investigation of aluminum-silicon carbide (Al/SiC) with and without cryogenic treated drills has been performed. The influence of drill treatment condition coupled with processing parameters on machinability of Al/SiC was observed in terms of thrust forces, drill vibration and hole surface integrity. It was observed that the cryogenic treatment is suitable to enhance the machinability of Al/SiC as it does not alter the drill morphology and reduce various drilling related issues. Cryogenic treatment increased drill hardness and reduced thrust force and drill vibration. Vibration acceleration decreases from 110 m/sec 2 to 98 m/sec 2 and 92 m/sec 2at maximum feed rate, with 24 hrs and 48 hrs cryogenic treatment, respectively. The reduction in drilling vibrations was the influential parameters that reduced drill diameter, delamination and surface roughness of the workpiece. Surface roughness was improved from Ra 1.96 µm to 1.7 µm at maximum feed rate with 24 hrs and 48 hrs cryogenic treatment, respectively.
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A study on the bearing effect of pier column backfilling in the goaf of a thin coal seam
Jianlin Xie,Weibing Zhu,JiaLin Xu,Jiahui Wen,Chuanzhen Liu 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.3
The pier column backfilling method in the goaf of a thin coal seam introduced in this paper is the latest backfilling technology in China, which has the combined advantages of high efficiency and low cost. In order to fully verify the load bearing effect of this backfilling method, a comprehensive evaluation model which combined the actual measurement, numerical simulation and physical simulation is implemented in this paper. First, the stress bearing formula and backfilling volume rate of a pier column backfilling body is obtained by theory analysis. Then, through field monitoring, it was concluded that the bearing capacity when the backfilling body reached a stable state was similar to the results of theoretical calculation, and no obvious deformation occurred by observation the roadway deformation with the site. Finally, based on the drilling columnar and lithological parameters of the site, corresponding physical and numerical models were established and used to study the bearing effect of this backfilling method. It could be found that the stresses and displacements data that resulted from the simulation relatively confirmed data obtained from the site. After comprehension of above researches, it is concluded that the pier column backfilling method in a goaf has good bearing effect and a good economic benefit for mining thin coal seams.
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