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RISS 인기검색어
- 검색키워드
- 저자 : Xiangming Huang (검색결과 4 건)
- 무료
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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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Experimental study on white layers in high-speed grinding of AISI52100 hardened steel
Xiangming Huang,Yinghui Ren,Zhixiong Zhou,Hang Xiao 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.3
Ground white layer structure is an untempered martensitic due to grinding heat and plastic deformation. Many researchers have studiedthe formation of white layers at low grinding speed. However, few studies were found on white layer at high grinding speed. Therefore,to minimize white layer, it would be very useful to know the formation of white layer in the high-speed grinding. We performed grindingexperiments using hardened AISI52100 steel with cubic boron nitride (CBN). Grinding force and grinding temperature were onlinemeasured during grinding process. Surface roughness, residual stress and white layer were also examined, respectively. The influence ofgrinding wheel speed on grinding force and surface integrity was analyzed. Formation of white layer was also studied. Experimentalresults show that grinding force and plastic deformation decrease significantly at higher grinding speed. Meanwhile, white layer depthand residual stress value increase with the grinding wheel speed, and residual stress is well correlated with ground white layer depth. White layer during high-speed grinding process results from phase transformation due to grinding heat and rapid cooling, while the plasticdeformation may be ignored for the ground white layer.
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Development of a High-Speed and Precision Micro- Spindle for Micro-Cutting
Wei Liu,Zhixiong Zhou,Xiangming Huang,Zhi-Jian He,Yong Du 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Mechanical micromachining using micro-machine tools is very competitive in manufacturing geometrically complex 3D micro-partsin various engineering materials with advantages of small space, energy-efficient, low equipment production and operation costs. Askey components of micro-machine tools, micro-spindles directly determine the performance of micro-machine tools and theapplication and development of mechanical micromachining technology. This study proposes a novel design concept of the separatelyspindle and tool and one-piece tool/rotor structure for micro-spindles, whose micro-tool can maintain good rotational accuracy athigh rotational speeds. In the principle prototype micro-spindle, an air driven turbine was used as power spindle. The design andoptimization of the micro-spindle were conducted. The fabrication and evaluation of the prototype micro-spindle were presented. Theresults of the principle prototype micro-spindle were analyzed and some efforts for the subsequent micro-spindle were proposed.
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Investigation of Grinding Characteristic using Nanofluid Minimum Quantity Lubrication
Cong Mao,Xiaojun Tang,Hongfu Zou,Xiangming Huang,Zhixiong Zhou 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Conventional grinding fluid is widely used in grinding process, which results in high consumption and impacting the environment. The promising alternative to conventional dry and fluid coolant application is minimum quantity lubrication (MQL). It is known that the cooling and lubrication performance of the grinding fluid is the key technical area for the success application of MQL grinding process. In this study, Water based Al2O3 nanofluid was applied to grinding process with MQL approach for its excellent convection heat transfer and thermal conductivity properties. The grinding characteristics of hardened AISI 52100 steel were investigated and compared with those of wet, dry and pure water MQL grinding. Experimental results show that water based Al2O3 nanofluid MQL grinding can significantly reduce the grinding temperature, decrease the grinding forces, improve the ground surface morphology and reduce the surface roughness in comparison to pure water MQL grinding. Furthermore, the cooling and lubricating mechanism for nanofluid MQL grinding was discussed in detail.
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