The Experts below are selected from a list of 2400 Experts worldwide ranked by ideXlab platform
C C Tsao - One of the best experts on this subject based on the ideXlab platform.
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effects of peripheral Drilling moment on delamination using special Drill Bits
Journal of Materials Processing Technology, 2008Co-Authors: C C Tsao, H HochengAbstract:The delamination damage caused by the Drilling thrust has been recognized as one of the major problems during Drilling. Based on the earlier concentrated-load model proposed, the thrust force is the main cause to delaminate at the Drill exit in workpiece. However, the central concentrated loading (twist Drill) is considered a special case of the general condition also with circular loading (saw Drill, candle stick Drill and core Drill). A comprehensive critical thrust force model considering the effects of the peripheral moment for saw Drill, candle stick Drill and core Drill compared with twist Drill is constructed in the present study. In this analysis, the critical thrust force associated with the effect of distributed peripheral moment causing the onset of delamination in use of special Drills is predicted and discussed.
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effects of special Drill Bits on Drilling induced delamination of composite materials
International Journal of Machine Tools & Manufacture, 2006Co-Authors: H Hocheng, C C TsaoAbstract:Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for joining structures. Delamination is among the serious concerns during Drilling. Practical experience proves the advantage of using such special Drills as saw Drill, candle stick Drill, core Drill and step Drill. The experimental investigation described in this paper examines the theoretical predictions of critical thrust force at the onset of delamination, and compares the effects of these different Drill Bits. The results confirm the analytical findings and are consistent with the industrial experience. Ultrasonic scanning is used to evaluate the extent of Drilling-induced delamination. The advantage of these special Drills is illustrated mathematically as well as experimentally, that their thrust force is distributed toward the Drill periphery instead of being concentrated at the center. The allowable feed rate without causing delamination is also increased. The analysis can be extended to examine the effects of other future innovative Drill Bits.
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the path towards delamination free Drilling of composite materials
Journal of Materials Processing Technology, 2005Co-Authors: H Hocheng, C C TsaoAbstract:Abstract The fiber-reinforced composite materials possess advantage for structural purpose in various industries. Delamination is considered the major concern in manufacturing the parts and assembly. Drilling is frequently applied in production cycle while the anisotropy and non-homogeneity of composite materials affect the chip deformation and machining behavior during Drilling. Traditional and non-traditional Drilling processes are feasible for making fine holes for composite materials by carefully selected tool, method and operating conditions. In this article, the path towards the delamination-free Drilling of composite material is reviewed. The major scenes are illustrated including the aspects of the analytical approach, the practical use of special Drill Bits, pilot hole and back-up plate, and the employment of non-traditional machining method.
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taguchi analysis of delamination associated with various Drill Bits in Drilling of composite material
International Journal of Machine Tools & Manufacture, 2004Co-Authors: C C Tsao, H HochengAbstract:Abstract This paper presents a prediction and evaluation of delamination factor in use of twist Drill, candle stick Drill and saw Drill. The approach is based on Taguchi’s method and the analysis of variance (ANOVA). An ultrasonic C-Scan to examine the delamination of carbon fiber-reinforced plastic (CFRP) laminate is used in this paper. The experiments were conducted to study the delamination factor under various cutting conditions. The experimental results indicate that the feed rate and the Drill diameter are recognized to make the most significant contribution to the overall performance. The objective was to establish a correlation between feed rate, spindle speed and Drill diameter with the induced delamination in a CFRP laminate. The correlation was obtained by multi-variable linear regression and compared with the experimental results.
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comprehensive analysis of delamination in Drilling of composite materials with various Drill Bits
Journal of Materials Processing Technology, 2003Co-Authors: H Hocheng, C C TsaoAbstract:Abstract Beside the twist Drill, the effects of various Drill geometries were rarely discussed in analytical fashion. This study presents a comprehensive analysis of delamination in use of various Drill types, such as saw Drill, candle stick Drill, core Drill and step Drill. In this analysis, the critical thrust force at the onset of delamination is predicted and compared with the twist Drill.
H Hocheng - One of the best experts on this subject based on the ideXlab platform.
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effects of peripheral Drilling moment on delamination using special Drill Bits
Journal of Materials Processing Technology, 2008Co-Authors: C C Tsao, H HochengAbstract:The delamination damage caused by the Drilling thrust has been recognized as one of the major problems during Drilling. Based on the earlier concentrated-load model proposed, the thrust force is the main cause to delaminate at the Drill exit in workpiece. However, the central concentrated loading (twist Drill) is considered a special case of the general condition also with circular loading (saw Drill, candle stick Drill and core Drill). A comprehensive critical thrust force model considering the effects of the peripheral moment for saw Drill, candle stick Drill and core Drill compared with twist Drill is constructed in the present study. In this analysis, the critical thrust force associated with the effect of distributed peripheral moment causing the onset of delamination in use of special Drills is predicted and discussed.
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effects of special Drill Bits on Drilling induced delamination of composite materials
International Journal of Machine Tools & Manufacture, 2006Co-Authors: H Hocheng, C C TsaoAbstract:Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for joining structures. Delamination is among the serious concerns during Drilling. Practical experience proves the advantage of using such special Drills as saw Drill, candle stick Drill, core Drill and step Drill. The experimental investigation described in this paper examines the theoretical predictions of critical thrust force at the onset of delamination, and compares the effects of these different Drill Bits. The results confirm the analytical findings and are consistent with the industrial experience. Ultrasonic scanning is used to evaluate the extent of Drilling-induced delamination. The advantage of these special Drills is illustrated mathematically as well as experimentally, that their thrust force is distributed toward the Drill periphery instead of being concentrated at the center. The allowable feed rate without causing delamination is also increased. The analysis can be extended to examine the effects of other future innovative Drill Bits.
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the path towards delamination free Drilling of composite materials
Journal of Materials Processing Technology, 2005Co-Authors: H Hocheng, C C TsaoAbstract:Abstract The fiber-reinforced composite materials possess advantage for structural purpose in various industries. Delamination is considered the major concern in manufacturing the parts and assembly. Drilling is frequently applied in production cycle while the anisotropy and non-homogeneity of composite materials affect the chip deformation and machining behavior during Drilling. Traditional and non-traditional Drilling processes are feasible for making fine holes for composite materials by carefully selected tool, method and operating conditions. In this article, the path towards the delamination-free Drilling of composite material is reviewed. The major scenes are illustrated including the aspects of the analytical approach, the practical use of special Drill Bits, pilot hole and back-up plate, and the employment of non-traditional machining method.
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taguchi analysis of delamination associated with various Drill Bits in Drilling of composite material
International Journal of Machine Tools & Manufacture, 2004Co-Authors: C C Tsao, H HochengAbstract:Abstract This paper presents a prediction and evaluation of delamination factor in use of twist Drill, candle stick Drill and saw Drill. The approach is based on Taguchi’s method and the analysis of variance (ANOVA). An ultrasonic C-Scan to examine the delamination of carbon fiber-reinforced plastic (CFRP) laminate is used in this paper. The experiments were conducted to study the delamination factor under various cutting conditions. The experimental results indicate that the feed rate and the Drill diameter are recognized to make the most significant contribution to the overall performance. The objective was to establish a correlation between feed rate, spindle speed and Drill diameter with the induced delamination in a CFRP laminate. The correlation was obtained by multi-variable linear regression and compared with the experimental results.
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comprehensive analysis of delamination in Drilling of composite materials with various Drill Bits
Journal of Materials Processing Technology, 2003Co-Authors: H Hocheng, C C TsaoAbstract:Abstract Beside the twist Drill, the effects of various Drill geometries were rarely discussed in analytical fashion. This study presents a comprehensive analysis of delamination in use of various Drill types, such as saw Drill, candle stick Drill, core Drill and step Drill. In this analysis, the critical thrust force at the onset of delamination is predicted and compared with the twist Drill.
K P Mingard - One of the best experts on this subject based on the ideXlab platform.
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examination of wear damage to rock mining hardmetal Drill Bits
International Journal of Refractory Metals & Hard Materials, 2017Co-Authors: H G Jones, Mihalis Kritikos, Susanne Norgren, K P MingardAbstract:Abstract WC/Co mining Bits from a Drill head used for Drilling holes for roof support bolts in a mine were examined using a focused ion beam scanning electron microscope (FIB-SEM). This was combined with energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses to study the chemical interaction between the Drill bit and the rock. It was found that at the surface of the buttons there was depletion of cobalt, change in chemistry of the remaining binder regions, and changes to the morphology of the WC grains. Tribochemistry calculations were done to understand the possible formation of silicides at the surface of the Drill Bits, and thus emphasise the importance of quartz content in rock on wear. The evidence of mechanical damage combined with chemical reactions is another step towards understanding the complete wear process in hardmetal mining tools.
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examination of wear damage to rock mining hardmetal Drill Bits
International Journal of Refractory Metals & Hard Materials, 2017Co-Authors: H G Jones, Mihalis Kritikos, Susanne Norgren, K P MingardAbstract:Abstract WC/Co mining Bits from a Drill head used for Drilling holes for roof support bolts in a mine were examined using a focused ion beam scanning electron microscope (FIB-SEM). This was combined with energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses to study the chemical interaction between the Drill bit and the rock. It was found that at the surface of the buttons there was depletion of cobalt, change in chemistry of the remaining binder regions, and changes to the morphology of the WC grains. Tribochemistry calculations were done to understand the possible formation of silicides at the surface of the Drill Bits, and thus emphasise the importance of quartz content in rock on wear. The evidence of mechanical damage combined with chemical reactions is another step towards understanding the complete wear process in hardmetal mining tools.
Susanne Norgren - One of the best experts on this subject based on the ideXlab platform.
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examination of wear damage to rock mining hardmetal Drill Bits
International Journal of Refractory Metals & Hard Materials, 2017Co-Authors: H G Jones, Mihalis Kritikos, Susanne Norgren, K P MingardAbstract:Abstract WC/Co mining Bits from a Drill head used for Drilling holes for roof support bolts in a mine were examined using a focused ion beam scanning electron microscope (FIB-SEM). This was combined with energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses to study the chemical interaction between the Drill bit and the rock. It was found that at the surface of the buttons there was depletion of cobalt, change in chemistry of the remaining binder regions, and changes to the morphology of the WC grains. Tribochemistry calculations were done to understand the possible formation of silicides at the surface of the Drill Bits, and thus emphasise the importance of quartz content in rock on wear. The evidence of mechanical damage combined with chemical reactions is another step towards understanding the complete wear process in hardmetal mining tools.
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examination of wear damage to rock mining hardmetal Drill Bits
International Journal of Refractory Metals & Hard Materials, 2017Co-Authors: H G Jones, Mihalis Kritikos, Susanne Norgren, K P MingardAbstract:Abstract WC/Co mining Bits from a Drill head used for Drilling holes for roof support bolts in a mine were examined using a focused ion beam scanning electron microscope (FIB-SEM). This was combined with energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses to study the chemical interaction between the Drill bit and the rock. It was found that at the surface of the buttons there was depletion of cobalt, change in chemistry of the remaining binder regions, and changes to the morphology of the WC grains. Tribochemistry calculations were done to understand the possible formation of silicides at the surface of the Drill Bits, and thus emphasise the importance of quartz content in rock on wear. The evidence of mechanical damage combined with chemical reactions is another step towards understanding the complete wear process in hardmetal mining tools.
Arnis Judzis - One of the best experts on this subject based on the ideXlab platform.
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Optimization of Deep Drilling Performance - Development and Benchmark Testing of Advanced Diamond Product Drill Bits & HP/HT Fluids to Significantly Improve Rates of Penetration
2005Co-Authors: Alan Black, Arnis JudzisAbstract:This document details the progress to date on the OPTIMIZATION OF DEEP DrillING PERFORMANCE--DEVELOPMENT AND BENCHMARK TESTING OF ADVANCED DIAMOND PRODUCT Drill Bits AND HP/HT FLUIDS TO SIGNIFICANTLY IMPROVE RATES OF PENETRATION contract for the year starting October 2004 through September 2005. The industry cost shared program aims to benchmark Drilling rates of penetration in selected simulated deep formations and to significantly improve ROP through a team development of aggressive diamond product Drill bit--fluid system technologies. Overall the objectives are as follows: Phase 1--Benchmark ''best in class'' diamond and other product Drilling Bits and fluids and develop concepts for a next level of deep Drilling performance; Phase 2--Develop advanced smart bit-fluid prototypes and test at large scale; and Phase 3--Field trial smart bit--fluid concepts, modify as necessary and commercialize products. As of report date, TerraTek has concluded all Phase 1 testing and is planning Phase 2 development
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Optimization of Deep Drilling Performance--Development and Benchmark Testing of Advanced Diamond Product Drill Bits & HP/HT Fluids to Significantly Improve Rates of Penetration
2003Co-Authors: Alan Black, Arnis JudzisAbstract:This document details the progress to date on the OPTIMIZATION OF DEEP DrillING PERFORMANCE--DEVELOPMENT AND BENCHMARK TESTING OF ADVANCED DIAMOND PRODUCT Drill Bits AND HP/HT FLUIDS TO SIGNIFICANTLY IMPROVE RATES OF PENETRATION contract for the year starting October 2002 through September 2002. The industry cost shared program aims to benchmark Drilling rates of penetration in selected simulated deep formations and to significantly improve ROP through a team development of aggressive diamond product Drill bit--fluid system technologies. Overall the objectives are as follows: Phase 1--Benchmark ''best in class'' diamond and other product Drilling Bits and fluids and develop concepts for a next level of deep Drilling performance; Phase 2--Develop advanced smart bit--fluid prototypes and test at large scale; and Phase 3--Field trial smart bit--fluid concepts, modify as necessary and commercialize products. Accomplishments to date include the following: 4Q 2002--Project started; Industry Team was assembled; Kick-off meeting was held at DOE Morgantown; 1Q 2003--Engineering meeting was held at Hughes Christensen, The Woodlands Texas to prepare preliminary plans for development and testing and review equipment needs; Operators started sending information regarding their needs for deep Drilling challenges and priorities for large-scale testing experimental matrix; Aramco joined the Industry Team as DEA 148 objectives paralleled the DOE project; 2Q 2003--Engineering and planning for high pressure Drilling at TerraTek commenced; 3Q 2003--Continuation of engineering and design work for high pressure Drilling at TerraTek; Baker Hughes INTEQ Drilling Fluids and Hughes Christensen commence planning for Phase 1 testing--recommendations for Bits and fluids
