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RISS 인기검색어
- 검색키워드
- 저자 : Zhaohui Deng (검색결과 4 건)
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Zhaohui Deng,Lishu Lv,Wenliang Huang,Yangdong Shi 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.1
This paper aims to reduce the carbon emission of the manufacturing process and to achieve the low carbon optimization decision of the machining process route. Carbon emission was analyzed from the perspective of material flow, energy flow and environmental flow, and the machining process route carbon efficiency model was established based on the one from per unit cutted-volume. A multi-objective machining process route optimization model was established based on the genetic algorithms (GA), and the minimum processing time (high efficiency) and the optimal carbon efficiency (low carbon) were set as the optimization objectives. An experiment case study was performed on grinding carriage box, and a comparison was given between the optimized process and traditional process. The results indicate the resultant process route from the proposed algorithm, which verifies to reduce the processing time and increase the carbon efficiency.
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Jun Yi,Zhaohui Deng,Wei Zhou,Shujian Li 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.4
Based on the classical theory of heat conduction and thermoplastic mechanics, the three-dimensional heat transfer andthermal stress models of high-velocity oxygen fuel WC–10Co4Cr coating under the action of a moving heat source duringgrinding were developed. Considering temperature-dependent material properties, the transient temperature fi eld and thethermal stress fi eld generated in workpiece were simulated by a fi nite element method (FEM). As both the thermal conductivityand the specifi c heat capacity of WC–10Co4Cr are larger than 300 M, temperature rise mainly occurred in the coating. The rise in grinding temperature was discontinuous along the depth of the workpiece, and the temperature gradient at thecoating–substrate interface was found to be the largest. Due to the large diff erence in thermal expansion coeffi cient betweencoating and substrate material, considerable thermal stress was generated at the bonding surface. Grinding temperatureand thermal stresses at the coating–substrate interface started to increase with the decrease in coating thickness. Grindingsurface temperatures were measured experimentally for diff erent coating thicknesses, and simulation results were comparedwith the obtained experimental values. It was found that FEM results were well consistent with experimental observations.
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Experiment research on grind-hardening of AISI5140 steel based on thermal compensation
Xiangming Huang,Yinghui Ren,Bo Zheng,Zhaohui Deng 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.8
The grind-hardening process utilizes the heat generated to induce martensitic phase transformation. However, the maximum achievable harden layer depth is limited due to high grinding forces, and the tensile residual stress appears on the ground surface in the grindhardening process. This paper proposes a new grind-hardening technology using thermal compensation. The workpiece of AISI5140 steel is preheated by electric resistance heating, and ground under the condition of the workpiece temperature 25°C, 120°C, 180°C and 240°C. The grinding force, harden layer depth and surface quality including residual stress on ground surface, surface roughness and micro-hardness are investigated. The experimental results show that a deep harden layer with a fine grain martensite can be obtained with the thermal compensation. The ground workpiece surface produces a certain compressive residual stress, and the residual compressive stress value increases with preheating temperature. As the preheating temperature increases, grinding force slightly decreases, while there is slightly increment of surface roughness. Compared with the conventional grind-hardening process, both the harden layer depth and residual stress distribution are significantly improved.
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Grinding Marks on Ultra-Precision Grinding Spherical and Aspheric Surfaces
Bing Chen,Bing Guo,Shichun Li,Zhaohui Deng,Qingliang Zhao 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.4
Grinding marks are regard as a great obstacle to manufacture spherical and aspheric surfaces with higher surface quality, lower energy and wastage. The scallop-height was studied for optimizing the grinding parameters firstly to reduce its effect on grinding marks. Secondly, the expression of grinding points distribution was established to characterize the grinding marks caused by the radial run-out of grinding wheel. And then, the aspheric grinding experiments of monocrystalline silicon were carried out to investigate the influence of grinding marks on surface quality. The experiments revealed that the remarkable grinding marks with patterned grinding points distribution would cause more fractures and roughness, deeper grooves, and more inhomogeneous surface quality compared with the weak grinding marks. The discriminating standard of grinding marks was established, and the grinding parameters were optimized for homogenizing the grinding points distribution by this discriminating standard to reduce the grinding marks in actual grinding process. Finally, the large size infrared lens was ground with high surface quality by the optimized grinding parameters, and the results of surface quality demonstrate that the discriminating standard was effective. This research provides references and ideas for grinding aspherical surface with high surface quality and efficiency, low energy and wastage.
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