The Experts below are selected from a list of 7608 Experts worldwide ranked by ideXlab platform
Juntao Jing - One of the best experts on this subject based on the ideXlab platform.
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investigation on the surface morphology of si 3 n 4 ceramics by a new fractal dimension calculation method
Applied Surface Science, 2016Co-Authors: Juntao Jing, Hong Zhao, Pingfa Feng, Shiliang Wei, Yunfeng LiuAbstract:Abstract Rotary ultrasonic Grinding Machining (RUGM) has been employed in Si 3 N 4 ceramics parts Machining widely, and the surface morphology is related with surface friction and wear properties directly. It is necessary to investigation on the surface morphology characterization to improve surface quality. Surface morphology of Si 3 N 4 ceramics for rotary ultrasonic Grinding Machining was investigated based on fractal theory in the paper. The fractal features of surface morphology have been proved with qualitative and quantitative investigation. Differential box-counting method and peleg-blanket method was applied to calculate fractal dimension, but low calculation accuracy was found. So a new fractal dimension calculation method called perimeter-volume method has been proposed. The results show that the calculation deviation rate of morphology fractal dimension is only 2.5%. Meanwhile, the influence of spindle speed, cutting depth, feed rate and cutting force on fractal dimension has also been investigated. The investigation results provide the support for surface morphology optimization.
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Investigation on three-dimensional surface roughness evaluation of engineering ceramic for rotary ultrasonic Grinding Machining
Applied Surface Science, 2015Co-Authors: Wei Shiliang, Hong Zhao, Juntao JingAbstract:Abstract Surface roughness has considerable influence on its quality and function of products in precision and ultra-precision Machining, and the same situation applies to engineering ceramic for rotary ultrasonic Grinding Machining (RUGM). This paper presents a new parameter, called fractal root mean square deviation, for evaluating engineering ceramic three-dimensional (3D) surface roughness of RUGM. Based on engineering ceramics surface of RUGM is typical isotropic, the mathematical model of fractal root mean square deviation was established, and it possesses double characteristics of absolute measurement and multi-scale. Then validation has been implemented, and fractal root mean square deviation is superior to evaluate engineering ceramic 3D surface roughness with better resolution and sensitivity. Furthermore, the relationship between main factor parameters and fractal root mean square deviation was proposed. The evaluation parameter and the results could be implemented in practice to get higher quality surface.
Hong Zhao - One of the best experts on this subject based on the ideXlab platform.
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investigation on the surface morphology of si 3 n 4 ceramics by a new fractal dimension calculation method
Applied Surface Science, 2016Co-Authors: Juntao Jing, Hong Zhao, Pingfa Feng, Shiliang Wei, Yunfeng LiuAbstract:Abstract Rotary ultrasonic Grinding Machining (RUGM) has been employed in Si 3 N 4 ceramics parts Machining widely, and the surface morphology is related with surface friction and wear properties directly. It is necessary to investigation on the surface morphology characterization to improve surface quality. Surface morphology of Si 3 N 4 ceramics for rotary ultrasonic Grinding Machining was investigated based on fractal theory in the paper. The fractal features of surface morphology have been proved with qualitative and quantitative investigation. Differential box-counting method and peleg-blanket method was applied to calculate fractal dimension, but low calculation accuracy was found. So a new fractal dimension calculation method called perimeter-volume method has been proposed. The results show that the calculation deviation rate of morphology fractal dimension is only 2.5%. Meanwhile, the influence of spindle speed, cutting depth, feed rate and cutting force on fractal dimension has also been investigated. The investigation results provide the support for surface morphology optimization.
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Investigation on three-dimensional surface roughness evaluation of engineering ceramic for rotary ultrasonic Grinding Machining
Applied Surface Science, 2015Co-Authors: Wei Shiliang, Hong Zhao, Juntao JingAbstract:Abstract Surface roughness has considerable influence on its quality and function of products in precision and ultra-precision Machining, and the same situation applies to engineering ceramic for rotary ultrasonic Grinding Machining (RUGM). This paper presents a new parameter, called fractal root mean square deviation, for evaluating engineering ceramic three-dimensional (3D) surface roughness of RUGM. Based on engineering ceramics surface of RUGM is typical isotropic, the mathematical model of fractal root mean square deviation was established, and it possesses double characteristics of absolute measurement and multi-scale. Then validation has been implemented, and fractal root mean square deviation is superior to evaluate engineering ceramic 3D surface roughness with better resolution and sensitivity. Furthermore, the relationship between main factor parameters and fractal root mean square deviation was proposed. The evaluation parameter and the results could be implemented in practice to get higher quality surface.
Wei Shiliang - One of the best experts on this subject based on the ideXlab platform.
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Investigation on three-dimensional surface roughness evaluation of engineering ceramic for rotary ultrasonic Grinding Machining
Applied Surface Science, 2015Co-Authors: Wei Shiliang, Hong Zhao, Juntao JingAbstract:Abstract Surface roughness has considerable influence on its quality and function of products in precision and ultra-precision Machining, and the same situation applies to engineering ceramic for rotary ultrasonic Grinding Machining (RUGM). This paper presents a new parameter, called fractal root mean square deviation, for evaluating engineering ceramic three-dimensional (3D) surface roughness of RUGM. Based on engineering ceramics surface of RUGM is typical isotropic, the mathematical model of fractal root mean square deviation was established, and it possesses double characteristics of absolute measurement and multi-scale. Then validation has been implemented, and fractal root mean square deviation is superior to evaluate engineering ceramic 3D surface roughness with better resolution and sensitivity. Furthermore, the relationship between main factor parameters and fractal root mean square deviation was proposed. The evaluation parameter and the results could be implemented in practice to get higher quality surface.
Bercovici Moran - One of the best experts on this subject based on the ideXlab platform.
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Buoyancy-based Rapid Prototyping of Lenses
2020Co-Authors: Frumkin Valeri, Bercovici MoranAbstract:Current methods for fabricating lenses rely on mechanical processing of the lens or mold, such as Grinding, Machining and polishing. The complexity of these fabrication processes and the required specialized equipment prohibit rapid prototyping of optical components. This work presents a simple method that leverages the basic physics of surface tension and hydrostatics for rapidly fabricating a variety of lenses with optical surface quality and without the need for any mechanical processing. This approach allows to fabricate all types of spherical lenses(positive, negative, meniscus)over a wide range of sizes and curvatures, as well as lenses of special structure and topography(aspherical, saddle, bi-focal, doublet). The method is inexpensive, does not require specialized equipment, and can be implemented using a variety of curable liquids
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Fluidic Shaping of Optical Components
2020Co-Authors: Frumkin Valeri, Bercovici MoranAbstract:Current methods for fabricating lenses rely on mechanical processing of the lens or mold, such as Grinding, Machining, and polishing. The complexity of these fabrication processes and the required specialized equipment prohibit rapid prototyping of optical components. This work presents a simple method, based on free-energy minimization of liquid volumes, which allows to quickly shape curable liquids into a wide range of spherical and aspherical optical components, without the need for any mechanical processing. After the desired shape is obtained, the liquid can be cured to produce a solid object with nanometric surface quality. We provide a theoretical model that accurately predicts the shape of the optical components, and demonstrate rapid fabrication of all types of spherical lenses (convex, concave, meniscus), cylindrical lenses, bifocal lenses, toroidal lenses, doublet lenses and aspheric lenses. The method is inexpensive and can be implemented using a variety of curable liquids with different optical and mechanical properties. In addition, the method is scale-invariant and can be used to produce even very large optical components, without a significant increase in fabrication time. We believe that the ability to easily and rapidly create high-quality optics, without the need for complex and expensive infrastructure, will provide researchers with new affordable tools for fabricating and testing optical designs
Yunfeng Liu - One of the best experts on this subject based on the ideXlab platform.
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investigation on the surface morphology of si 3 n 4 ceramics by a new fractal dimension calculation method
Applied Surface Science, 2016Co-Authors: Juntao Jing, Hong Zhao, Pingfa Feng, Shiliang Wei, Yunfeng LiuAbstract:Abstract Rotary ultrasonic Grinding Machining (RUGM) has been employed in Si 3 N 4 ceramics parts Machining widely, and the surface morphology is related with surface friction and wear properties directly. It is necessary to investigation on the surface morphology characterization to improve surface quality. Surface morphology of Si 3 N 4 ceramics for rotary ultrasonic Grinding Machining was investigated based on fractal theory in the paper. The fractal features of surface morphology have been proved with qualitative and quantitative investigation. Differential box-counting method and peleg-blanket method was applied to calculate fractal dimension, but low calculation accuracy was found. So a new fractal dimension calculation method called perimeter-volume method has been proposed. The results show that the calculation deviation rate of morphology fractal dimension is only 2.5%. Meanwhile, the influence of spindle speed, cutting depth, feed rate and cutting force on fractal dimension has also been investigated. The investigation results provide the support for surface morphology optimization.
