The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform
H. Hocheng - One of the best experts on this subject based on the ideXlab platform.
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Plenary lecture 1: micropattern fabrication by masked excimer laser dragging
2010Co-Authors: H. HochengAbstract:Micromachining has been successfully achieved by excimer laser machining of various materials. An excimer laser dragging process to ablate a groove pattern on a polymer sheet through a mask opening is presented in this paper. The material PC is used in this study because of its good absorption coefficient for ultraviolet light and the excellent optical properties at the wavelength of 193 nm. A large number of papers have studied the interaction between the laser machining parameters and various materials. However, the prediction of the cross-sectional Profile after the laser dragging is rarely reported for the fabrication of micro-patterns. This work predicts the Profile made by the excimer laser dragging process with various masks. A mathematical model describing the relationship between laser machining parameters and the produced Profile is constructed. The proposed model shows how the Machined Profile is determined by the machining parameters. To fabricate a complex micro-component, a method with multipath scanning in different directions is envisioned based on the modeling of the Machined Profile from single-path dragging. The laser machining parameters include the dragging velocity, pulse repetition rate, pulse number, fluence and the opening dimensions of the mask pattern. The experimental results confirm various Machined Profiles can be effectively predicted in laser dragging. The analytical approach can be reversely utilized to design and fabricate the micropatterns in proper shapes with desired function.
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Microgroove pattern Machined by excimer laser dragging
International Journal of Manufacturing Technology and Management, 2008Co-Authors: H. Hocheng, Kuan Yu WangAbstract:A laser dragging process to ablate the groove pattern on a Polycarbonate (PC) sheet is analysed in this paper. To accurately predict the Machined Profile during the dragging process, a model describing the relationship between laser machining parameters and the produced Profile is constructed. Based on this model, the produced pattern of multipath cross scanning in various directions can be predicted. This paper presents the results of both experiment and numerical simulation in single and cross dragging. The experimental parameters include the dragging velocity, pulse repetition rate, pulse number, fluence and the height of the mask pattern, the width of the mask pattern. PC material is applied in this study for its excellent ablation characteristics at 248 nm of the wavelength. In the laser dragging, two shapes of masks are used, parabolic shape and triangular shape. The results show the produced Profile can be effectively predicted in laser dragging.
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Development of the eroded opening during electrochemical boring of hole
The International Journal of Advanced Manufacturing Technology, 2005Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:Electrochemical machining (ECM) has been increasingly recognized as a potential tool for mini-scale machining. Using the ECM process to erode a hole of hundreds of micrometres on a thin metal sheet is analysed in this paper. The purpose of this study is to predict the hole formation, particularly when boring through the hole. A theoretical method is presented to illustrate how the Machined Profile evolves. The analysis is based on the fundamental law of electrolysis and the integral of the electrochemical reaction over the finite width of the tool electrode. A concept of redistribution of electric charge is adopted in the model when the hole is bored through. The approach of the model is verified experimentally.
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Generation of erosion Profile of through hole in electrochemical boring using a stepwise moving electrode
International Journal of Manufacturing Technology and Management, 2005Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:Electrochemical machining has been increasingly recognised for its micromachining applications. A process to erode a hole of hundreds of micronmetres on the metal surface using a moving electrode is investigated in the current paper. This study provides the prediction of the produced hole enlargement and taper under the applied machining conditions during the process. A computational model is presented to illustrate how the Machined Profile develops as the time elapses and the electrode gap changes. The analysis is based on the fundamental law of electrolysis and the mathematical integral over a tool. The effectiveness of the model is examined by experiments using several schemes of the electrode movement.
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Development of the eroded opening during electrochemical boring of hole
The International Journal of Advanced Manufacturing Technology, 2004Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:[[abstract]]Electrochemical machining (ECM) has been increasingly recognized as a potential tool for mini-scale machining. Using the ECM process to erode a hole of hundreds of micrometres on a thin metal sheet is analysed in this paper. The purpose of this study is to predict the hole formation, particularly when boring through the hole. A theoretical method is presented to illustrate how the Machined Profile evolves. The analysis is based on the fundamental law of electrolysis and the integral of the electrochemical reaction over the finite width of the tool electrode. A concept of redistribution of electric charge is adopted in the model when the hole is bored through. The approach of the model is verified experimentally.[[fileno]]2020213010004[[department]]動機
P.s. Kao - One of the best experts on this subject based on the ideXlab platform.
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Development of the eroded opening during electrochemical boring of hole
The International Journal of Advanced Manufacturing Technology, 2005Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:Electrochemical machining (ECM) has been increasingly recognized as a potential tool for mini-scale machining. Using the ECM process to erode a hole of hundreds of micrometres on a thin metal sheet is analysed in this paper. The purpose of this study is to predict the hole formation, particularly when boring through the hole. A theoretical method is presented to illustrate how the Machined Profile evolves. The analysis is based on the fundamental law of electrolysis and the integral of the electrochemical reaction over the finite width of the tool electrode. A concept of redistribution of electric charge is adopted in the model when the hole is bored through. The approach of the model is verified experimentally.
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Generation of erosion Profile of through hole in electrochemical boring using a stepwise moving electrode
International Journal of Manufacturing Technology and Management, 2005Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:Electrochemical machining has been increasingly recognised for its micromachining applications. A process to erode a hole of hundreds of micronmetres on the metal surface using a moving electrode is investigated in the current paper. This study provides the prediction of the produced hole enlargement and taper under the applied machining conditions during the process. A computational model is presented to illustrate how the Machined Profile develops as the time elapses and the electrode gap changes. The analysis is based on the fundamental law of electrolysis and the mathematical integral over a tool. The effectiveness of the model is examined by experiments using several schemes of the electrode movement.
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Development of the eroded opening during electrochemical boring of hole
The International Journal of Advanced Manufacturing Technology, 2004Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:[[abstract]]Electrochemical machining (ECM) has been increasingly recognized as a potential tool for mini-scale machining. Using the ECM process to erode a hole of hundreds of micrometres on a thin metal sheet is analysed in this paper. The purpose of this study is to predict the hole formation, particularly when boring through the hole. A theoretical method is presented to illustrate how the Machined Profile evolves. The analysis is based on the fundamental law of electrolysis and the integral of the electrochemical reaction over the finite width of the tool electrode. A concept of redistribution of electric charge is adopted in the model when the hole is bored through. The approach of the model is verified experimentally.[[fileno]]2020213010004[[department]]動機
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A material removal analysis of electrochemical machining using flat-end cathode
Journal of Materials Processing Technology, 2003Co-Authors: H. Hocheng, Y.h. Sun, S.c. Lin, P.s. KaoAbstract:Abstract Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the Machined Profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the Machined Profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of Machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.
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A material removal analysis of electrochemical machining using flat-end cathode
Journal of Materials Processing Technology, 2003Co-Authors: H. Hocheng, Y.h. Sun, S.c. Lin, P.s. KaoAbstract:[[abstract]]Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the Machined Profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the Machined Profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of Machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.[[fileno]]2020213010003[[department]]動機
S.c. Lin - One of the best experts on this subject based on the ideXlab platform.
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Development of the eroded opening during electrochemical boring of hole
The International Journal of Advanced Manufacturing Technology, 2005Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:Electrochemical machining (ECM) has been increasingly recognized as a potential tool for mini-scale machining. Using the ECM process to erode a hole of hundreds of micrometres on a thin metal sheet is analysed in this paper. The purpose of this study is to predict the hole formation, particularly when boring through the hole. A theoretical method is presented to illustrate how the Machined Profile evolves. The analysis is based on the fundamental law of electrolysis and the integral of the electrochemical reaction over the finite width of the tool electrode. A concept of redistribution of electric charge is adopted in the model when the hole is bored through. The approach of the model is verified experimentally.
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Generation of erosion Profile of through hole in electrochemical boring using a stepwise moving electrode
International Journal of Manufacturing Technology and Management, 2005Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:Electrochemical machining has been increasingly recognised for its micromachining applications. A process to erode a hole of hundreds of micronmetres on the metal surface using a moving electrode is investigated in the current paper. This study provides the prediction of the produced hole enlargement and taper under the applied machining conditions during the process. A computational model is presented to illustrate how the Machined Profile develops as the time elapses and the electrode gap changes. The analysis is based on the fundamental law of electrolysis and the mathematical integral over a tool. The effectiveness of the model is examined by experiments using several schemes of the electrode movement.
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Development of the eroded opening during electrochemical boring of hole
The International Journal of Advanced Manufacturing Technology, 2004Co-Authors: H. Hocheng, P.s. Kao, S.c. LinAbstract:[[abstract]]Electrochemical machining (ECM) has been increasingly recognized as a potential tool for mini-scale machining. Using the ECM process to erode a hole of hundreds of micrometres on a thin metal sheet is analysed in this paper. The purpose of this study is to predict the hole formation, particularly when boring through the hole. A theoretical method is presented to illustrate how the Machined Profile evolves. The analysis is based on the fundamental law of electrolysis and the integral of the electrochemical reaction over the finite width of the tool electrode. A concept of redistribution of electric charge is adopted in the model when the hole is bored through. The approach of the model is verified experimentally.[[fileno]]2020213010004[[department]]動機
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A material removal analysis of electrochemical machining using flat-end cathode
Journal of Materials Processing Technology, 2003Co-Authors: H. Hocheng, Y.h. Sun, S.c. Lin, P.s. KaoAbstract:Abstract Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the Machined Profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the Machined Profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of Machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.
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A material removal analysis of electrochemical machining using flat-end cathode
Journal of Materials Processing Technology, 2003Co-Authors: H. Hocheng, Y.h. Sun, S.c. Lin, P.s. KaoAbstract:[[abstract]]Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the Machined Profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the Machined Profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of Machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.[[fileno]]2020213010003[[department]]動機
Y.h. Sun - One of the best experts on this subject based on the ideXlab platform.
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A material removal analysis of electrochemical machining using flat-end cathode
Journal of Materials Processing Technology, 2003Co-Authors: H. Hocheng, Y.h. Sun, S.c. Lin, P.s. KaoAbstract:Abstract Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the Machined Profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the Machined Profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of Machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.
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A material removal analysis of electrochemical machining using flat-end cathode
Journal of Materials Processing Technology, 2003Co-Authors: H. Hocheng, Y.h. Sun, S.c. Lin, P.s. KaoAbstract:[[abstract]]Electrochemical machining (ECM) has been increasingly recognized for the potential for machining, while the precision of the Machined Profile is a concern of its application. A process to erode a hole of hundreds of micrometers on the metal surface is analyzed in the current paper. A theoretical and computational model is presented to illustrate how the Machined Profile evolves as the time elapses. The analysis is based on the fundamental law of electrolysis and the integral of a finite-width tool. The paper also discusses the influence of experimental variables including time of electrolysis, voltage, molar concentration of electrolyte and electrode gap upon the amount of material removal and diameter of Machined hole. The results of experiment show the material removal increases with increasing electrical voltage, molar concentration of electrolyte, time of electrolysis and reduced initial gap. The time of electrolysis is the most influential factor on the produced diameter of hole.[[fileno]]2020213010003[[department]]動機
K A Ngoi - One of the best experts on this subject based on the ideXlab platform.
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wear characteristics of pcbn tools in the ultra precision machining of stainless steel at low speeds
Wear, 2003Co-Authors: Willey Yun Hsie Liew, K A NgoiAbstract:Polycrystalline cubic boron nitride (PCBN) cutting tools are widely used in the ultra-precision machining of stainless steel mould inserts for the injection moulding of optical lenses. During the machining of a spherical or an aspherical Profile on a mould insert, the cutting speed reduces significantly to approximately 0 as the cutting tool is fed towards the centre of the Machined Profile. This paper will report on experiments carried out to investigate the wear of various grades of PCBN tool in the ultra-precision machining of STAVAX (modified AISI 420 stainless steel) at low speeds. In the initial stage of machining, fine-scale cavities were formed on the rake face and as such, the damaged surface acted like a chip breaker and thus as a preferential site for crack initiation. Once a crack was initiated, it propagated along the grain boundaries leading to intergranular fracture. The experimental results show that the formation and extent of the surface fracture are greatly dependent on the cutting forces and the severity of abrasion on the rake face which are governed by the cutting temperature. The porosity, ductility and the bonding strength of the grains in the tool, apart from its thermal conductivity appear to have major influences on the fracture resistance of the tool.
