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RISS 인기검색어
- 검색키워드
- 저자 : Tanveer Saleh (검색결과 4 건)
- 무료
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- 유료
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In-process Truing of Metal-bonded Diamond Wheels for Electrolytic In-process Dressing(ELID) Grinding
Tanveer Saleh,Indraneel Biswas,Han Seok Lim,Mustafizur Rahman 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.4
Electrolytic in-process dressing(ELID) grinding is a new technique for achieving a nanoscale surface finish on hard and brittle materials such as optical glass and ceramics. This process applies an electrochemical dressing on the metal-bonded diamond wheels to ensure constant protrusion of sharp cutting grits throughout the grinding cycle. In conventional ELID grinding, a constant source of pulsed DC power is supplied to the ELID cell, but a feedback mechanism is necessary to control the dressing power and obtain better performance. In this study, we propose a new closed-loop wheel dressing technique for grinding wheel truing that addresses the efficient correction of eccentric wheel rotation and the nonuniformity in the grinding wheel profile. The technique relies on an iterative control algorithm for the ELID power supply. An inductive sensor is used to measure the wheel profile based on the gap between the sensor head and wheel edge, and this is used as the feedback signal to control the pulse width of the power supply. We discuss the detailed mathematical design of the control algorithm and provide simulation results that were confirmed experimentally.
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Tanveer Saleh,Indraneel Biswas,Han Seok Lim,Mustafizur Rahman 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.3
Electrolytic in-process dressing (ELID) grinding is a new technique for achieving a nanoscale surface finish on hard and brittle materials such as optical glass and ceramics. This process applies an electrochemical dressing on the metal-bonded diamond wheels to ensure constant protrusion of sharp cutting grits throughout the grinding cycle. In conventional ELID grinding, a constant source of pulsed DC power is supplied to the ELID cell, but a feedback mechanism is necessary to control the dressing power and obtain better performance. In this study, we propose a new closed-loop wheel dressing technique for grinding wheel truing that addresses the efficient correction of eccentric wheel rotation and the nonuniformity in the grinding wheel profile. The technique relies on an iterative control algorithm for the ELID power supply. An inductive sensor is used to measure the wheel profile based on the gap between the sensor head and wheel edge, and this is used as the feedback signal to control the pulse width of the power supply. We discuss the detailed mathematical design of the control algorithm and provide simulation results that were confirmed experimentally.
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Saleh, Tanveer,Biswas, Indraneel,Lim, Han-Seok,Rahman, Mustafizur Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.3
Electrolytic in-process dressing (ELID) grinding is a new technique for achieving a nanoscale surface finish on hard and brittle materials such as optical glass and ceramics. This process applies an electrochemical dressing on the metal-bonded diamond wheels to ensure constant protrusion of sharp cutting grits throughout the grinding cycle. In conventional ELID grinding, a constant source of pulsed DC power is supplied to the ELID cell, but a feedback mechanism is necessary to control the dressing power and obtain better performance. In this study, we propose a new closed-loop wheel dressing technique for grinding wheel truing that addresses the efficient correction of eccentric wheel rotation and the nonuniformity in the grinding wheel profile. The technique relies on an iterative control algorithm for the ELID power supply. An inductive sensor is used to measure the wheel profile based on the gap between the sensor head and wheel edge, and this is used as the feedback signal to control the pulse width of the power supply. We discuss the detailed mathematical design of the control algorithm and provide simulation results that were confirmed experimentally.
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Optical Anisotropy in Micromechanically Rolled Carbon Nanotube Forest
Mohd Asyraf bin Mohd Razib,Masud Rana,Tanveer Saleh,Harrison Fan,Andrew Koch,Alireza Nojeh,Kenichi Takahata,Asan Gani Bin Abdul Muthalif 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.5
The bulk appearance of arrays of vertically aligned carbonnanotubes (VACNT arrays or CNT forests) is dark as theyabsorb most of the incident light. In this paper, two postprocessingtechniques have been described where the CNTforest can be patterned by selective bending of the tips of thenanotubes using a rigid cylindrical tool. A tungsten tool wasused to bend the vertical structure of CNTs with predefinedparameters in two different ways as stated above: bendingusing the bottom surface of the tool (micromechanicalbending (M2B)) and rolling using the side of the tool(micromechanical rolling (M2R)). The processed zone wasinvestigated using a Field Emission Scanning ElectronMicroscope (FESEM) and optical setup to reveal the surfacemorphology and optical characteristics of the patterned CNTson the substrate. Interestingly, the polarized optical reflection from the micromechanical rolled (M2R) sample was found to besignificantly influenced by the rotation of the sample. It was observed that, if the polarization of the light is parallel to thealignment of the CNTs, the reflectance is at least 2 x higher than for the perpendicular direction. Furthermore, the reflectancevaried almost linearly with good repeatability (~10%) as the processed CNT forest sample was rotated from 0° to 90°.
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