The Experts below are selected from a list of 15387 Experts worldwide ranked by ideXlab platform
Hongsiang Ciou - One of the best experts on this subject based on the ideXlab platform.
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ultra precision surface finish of the hardened stainless mold steel using vibration assisted ball Polishing Process
International Journal of Machine Tools & Manufacture, 2008Co-Authors: Fang-jung Shiou, Hongsiang CiouAbstract:Abstract A vibration-assisted spherical Polishing system driven by a piezoelectric actuator has been newly developed on a machining center to improve the burnished surface roughness of hardened STAVAX plastic mold stainless steel and to reduce the volumetric wear of the Polishing ball. The optimal plane surface ball burnishing and vibration-assisted spherical Polishing parameters of the specimens have been determined after conducting the Taguchi's L 9 and L 18 matrix experiments, respectively. The surface roughness R a =0.10 μm, on average, of the burnished specimens can be improved to R a =0.036 μm ( R max =0.380 μm) using the optimal plane surface vibration-assisted spherical Polishing Process. The improvement of volumetric wear of the Polishing ball was about 72% using the vibration-assisted Polishing Process compared with the non-vibrated Polishing Process. A simplified kinetic model of the vibration-assisted spherical Polishing system for the burnished surface profile was also derived in this study. Applying the optimal plane surface ball burnishing and vibrated spherical Polishing parameters sequentially to a fine-milled freeform surface carrier of an F-theta scan lens, the surface roughness of R a =0.045 μm ( R y =0.65 μm), on average, within the measuring range of 149 μm×112 μm on the freeform surface, was obtainable.
F J P Sousa - One of the best experts on this subject based on the ideXlab platform.
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distribution of contact pressure over the surface of ceramic floor tiles during the Polishing Process
Journal of The European Ceramic Society, 2014Co-Authors: Ahryman Seixas Busse De Siqueira Nascimento, F J P SousaAbstract:Abstract Assisted with computational simulation this work quantitatively determined the distribution of contact pressure over the surface of porcelain stoneware tiles during the industrial Polishing Process. In modern Polishing lines there are basically three movements responsible for the scratching velocity and the position of the abrasives. Combining the kinematic equations obtained by these movements with a pre-existing model the contact pressure between abrasive tool and tile surface could be determined as function of time. The spatial distribution of average, standard deviation and maximum values of contact pressure were then obtained and mapped over the entire surface. The simulation results showed that the contact pressure tends to be 50% higher near to the center, in regions worked by the innermost abrasives. Additionally, periodical variations of up to 10% were found to occur due to the partial retreat of the abrasive tool.
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glossiness distribution over the surface of stoneware floor tiles due to the Polishing Process
Journal of Materials Science, 2007Co-Authors: F J P Sousa, Walter Lindolfo Weingaertner, Nerio Vicente, Orestes Estevam AlarconAbstract:The industrial Process for Polishing floor tiles requires several Polishing stages in order to produce the desirable glossiness. Works on floor tile Polishing with focus on the distribution of glossiness still lack in literature. The present work intends to measure and analyze the distribution of glossiness over the surface of porcelain stoneware tiles polished using forward speed of 7.5 cm s−1 and lateral oscillation frequency and amplitude of 0.2 s−1 and 12 cm. The glossiness pattern generated by the Polishing Process over the surface of six tiles were presented in grey-scale graphics, where each pixel was univocally associated with a portion of the tile surface. Correlations between the glossiness pattern found and the Polishing kinematics were developed. Significant differences of glossiness were registered either between tiles polished under the same Polishing condition, or within the surface of the same tile, between adjacent regions. The use of lateral oscillation motion caused the glossiness pattern over the tile surface to follow a waveform pattern, and two corroborative hypotheses were made in order to explain such fact, considering the light-surface interaction as well as the overlapping of trajectories of adjacent Polishing heads.
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kinematics of a single abrasive particle during the industrial Polishing Process of porcelain stoneware tiles
Journal of The European Ceramic Society, 2007Co-Authors: F J P Sousa, Jan C Aurich, Walter Lindolfo Weingaertner, Orestes Estevam AlarconAbstract:In order to achieve glossiness the porcelain stoneware tiles must undergo an industrial Polishing Process, which can be optimized by either the scratching phenomena or the Polishing kinematics. This paper is focused on the latter. Thus, the most important kinematic equations involved in Polishing Process were described. The lateral oscillation used in modern Polishing machines, as well as the other available motions were taken into account. The trajectory of abrasives, the scratching speed and the curvature radius could be obtained for each instant. The importance of adopting good kinematics parameters for the accomplishment of the Polishing Process was highlighted, and the equations furnished hereby serve as useful tools for further attempts in optimizing the Polishing Process.
Fang-jung Shiou - One of the best experts on this subject based on the ideXlab platform.
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parameters optimization on surface roughness improvement of zerodur optical glass using an innovative rotary abrasive fluid multi jet Polishing Process
Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2015Co-Authors: Fang-jung Shiou, Assefa AsmareAbstract:Abstract With the advance of contemporary technology, high precision surface finishing techniques for optical glasses are of great concern and developing to meet the requirements of the effective industrialized Processes. Not only the used tools but also Process parameters have great influence on the surface roughness improvements. In this paper, surface roughness improvement of Zerodur optical glass using an innovative rotary abrasive fluid multi-jet Polishing Process has been presented. For the same purpose, a tool for executing ultra precision Polishing was designed and manufactured. Taguchi's experimental approach, an L 18 orthogonal array was employed to obtain the optimal Process parameters. ANOVA analysis has also been carried out to determine the significant factors. It was observed that about a 98.33% improvement on surface roughness from ( R a ) 0.360 μm to ( R a ) 0.006 μm has been achieved. The experimental results show that a surface finished achieved can satisfy the requirements for optical-quality surface ( R a
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ultra precision surface finish of the hardened stainless mold steel using vibration assisted ball Polishing Process
International Journal of Machine Tools & Manufacture, 2008Co-Authors: Fang-jung Shiou, Hongsiang CiouAbstract:Abstract A vibration-assisted spherical Polishing system driven by a piezoelectric actuator has been newly developed on a machining center to improve the burnished surface roughness of hardened STAVAX plastic mold stainless steel and to reduce the volumetric wear of the Polishing ball. The optimal plane surface ball burnishing and vibration-assisted spherical Polishing parameters of the specimens have been determined after conducting the Taguchi's L 9 and L 18 matrix experiments, respectively. The surface roughness R a =0.10 μm, on average, of the burnished specimens can be improved to R a =0.036 μm ( R max =0.380 μm) using the optimal plane surface vibration-assisted spherical Polishing Process. The improvement of volumetric wear of the Polishing ball was about 72% using the vibration-assisted Polishing Process compared with the non-vibrated Polishing Process. A simplified kinetic model of the vibration-assisted spherical Polishing system for the burnished surface profile was also derived in this study. Applying the optimal plane surface ball burnishing and vibrated spherical Polishing parameters sequentially to a fine-milled freeform surface carrier of an F-theta scan lens, the surface roughness of R a =0.045 μm ( R y =0.65 μm), on average, within the measuring range of 149 μm×112 μm on the freeform surface, was obtainable.
Barney E. Klamecki - One of the best experts on this subject based on the ideXlab platform.
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comparison of material removal rate models and experimental results for the double sided Polishing Process
Journal of Materials Processing Technology, 2001Co-Authors: Barney E. KlameckiAbstract:Abstract In the double-sided Polishing Process both faces of the workpiece are polished simultaneously under apparently identical conditions. However, differences are observed in the material removal rate between the two workpiece faces, and over a series of Polishing runs, the side from which more material is removed changes. Polishing Process models describing material removal rate were developed and compared to observed behavior. The side-to-side difference in stock removal and change in workpiece side of greater material removal rate can be attributed to slurry flow redistribution due to accumulation of Polishing debris in the Polishing pads.
Orestes Estevam Alarcon - One of the best experts on this subject based on the ideXlab platform.
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glossiness distribution over the surface of stoneware floor tiles due to the Polishing Process
Journal of Materials Science, 2007Co-Authors: F J P Sousa, Walter Lindolfo Weingaertner, Nerio Vicente, Orestes Estevam AlarconAbstract:The industrial Process for Polishing floor tiles requires several Polishing stages in order to produce the desirable glossiness. Works on floor tile Polishing with focus on the distribution of glossiness still lack in literature. The present work intends to measure and analyze the distribution of glossiness over the surface of porcelain stoneware tiles polished using forward speed of 7.5 cm s−1 and lateral oscillation frequency and amplitude of 0.2 s−1 and 12 cm. The glossiness pattern generated by the Polishing Process over the surface of six tiles were presented in grey-scale graphics, where each pixel was univocally associated with a portion of the tile surface. Correlations between the glossiness pattern found and the Polishing kinematics were developed. Significant differences of glossiness were registered either between tiles polished under the same Polishing condition, or within the surface of the same tile, between adjacent regions. The use of lateral oscillation motion caused the glossiness pattern over the tile surface to follow a waveform pattern, and two corroborative hypotheses were made in order to explain such fact, considering the light-surface interaction as well as the overlapping of trajectories of adjacent Polishing heads.
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kinematics of a single abrasive particle during the industrial Polishing Process of porcelain stoneware tiles
Journal of The European Ceramic Society, 2007Co-Authors: F J P Sousa, Jan C Aurich, Walter Lindolfo Weingaertner, Orestes Estevam AlarconAbstract:In order to achieve glossiness the porcelain stoneware tiles must undergo an industrial Polishing Process, which can be optimized by either the scratching phenomena or the Polishing kinematics. This paper is focused on the latter. Thus, the most important kinematic equations involved in Polishing Process were described. The lateral oscillation used in modern Polishing machines, as well as the other available motions were taken into account. The trajectory of abrasives, the scratching speed and the curvature radius could be obtained for each instant. The importance of adopting good kinematics parameters for the accomplishment of the Polishing Process was highlighted, and the equations furnished hereby serve as useful tools for further attempts in optimizing the Polishing Process.