The Experts below are selected from a list of 2790 Experts worldwide ranked by ideXlab platform
Chi Hung Ho - One of the best experts on this subject based on the ideXlab platform.
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shrinkage properties of ceramic injection Moulding part with a step contracted cross section in the filling direction
Ceramics International, 2004Co-Authors: Renhaw Chen, Chi Hung HoAbstract:The need for ceramic materials in microelectromechanical systems (MEMS) is increasing quickly. A typical form of designed ceramic micro parts involves the structuring of several micro columns and/or thin walls on a substrate. This work considers the use of a model Mould with a straight Mould Cavity and a step-contracted cross-section in the filling direction. The injection Moulding of such of ceramic micro part is experimentally simulated. The effect of the Mould Cavity contraction ratio, Moulding conditions, and the solid loading of the ceramic/binder mixture on the distribution of the transverse shrinkage of the Moulding parts at Moulded, debinded, and sintered stages, respectively, are examined. Experimental results reveal that transverse shrinkage of the region downstream from the step-contracted cross-section clearly exceeds that of the region upstream in all three stages. Furthermore, transverse shrinkage varies greatly in the plane of the step-contracted cross-section. The magnitude of the variation in transverse shrinkage in the step-contracted cross-section increases with the contraction ratio of the Mould Cavity. Appropriately increasing either the holding pressure or the filling pressure of the Mould Cavity reduces the variation in the transverse shrinkage of the step-contracted cross-section. Moreover, using the ceramic/binder mixture with a composition similar to that of critical solid loading can lower the internal stress caused by sintering in the vicinity of the step-contracted cross-section.
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shrinkage properties of ceramic injection Moulding part with a step contracted cross section in the filling direction
Ceramics International, 2004Co-Authors: Renhaw Chen, Chi Hung HoAbstract:The need for ceramic materials in microelectromechanical systems (MEMS) is increasing quickly. A typical form of designed ceramic micro parts involves the structuring of several micro columns and/or thin walls on a substrate. This work considers the use of a model Mould with a straight Mould Cavity and a step-contracted cross-section in the filling direction. The injection Moulding of such of ceramic micro part is experimentally simulated. The effect of the Mould Cavity contraction ratio, Moulding conditions, and the solid loading of the ceramic/binder mixture on the distribution of the transverse shrinkage of the Moulding parts at Moulded, debinded, and sintered stages, respectively, are examined. Experimental results reveal that transverse shrinkage of the region downstream from the step-contracted cross-section clearly exceeds that of the region upstream in all three stages. Furthermore, transverse shrinkage varies greatly in the plane of the step-contracted cross-section. The magnitude of the variation in transverse shrinkage in the step-contracted cross-section increases with the contraction ratio of the Mould Cavity. Appropriately increasing either the holding pressure or the filling pressure of the Mould Cavity reduces the variation in the transverse shrinkage of the step-contracted cross-section. Moreover, using the ceramic/binder mixture with a composition similar to that of critical solid loading can lower the internal stress caused by sintering in the vicinity of the step-contracted cross-section.
Renhaw Chen - One of the best experts on this subject based on the ideXlab platform.
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shrinkage properties of ceramic injection Moulding part with a step contracted cross section in the filling direction
Ceramics International, 2004Co-Authors: Renhaw Chen, Chi Hung HoAbstract:The need for ceramic materials in microelectromechanical systems (MEMS) is increasing quickly. A typical form of designed ceramic micro parts involves the structuring of several micro columns and/or thin walls on a substrate. This work considers the use of a model Mould with a straight Mould Cavity and a step-contracted cross-section in the filling direction. The injection Moulding of such of ceramic micro part is experimentally simulated. The effect of the Mould Cavity contraction ratio, Moulding conditions, and the solid loading of the ceramic/binder mixture on the distribution of the transverse shrinkage of the Moulding parts at Moulded, debinded, and sintered stages, respectively, are examined. Experimental results reveal that transverse shrinkage of the region downstream from the step-contracted cross-section clearly exceeds that of the region upstream in all three stages. Furthermore, transverse shrinkage varies greatly in the plane of the step-contracted cross-section. The magnitude of the variation in transverse shrinkage in the step-contracted cross-section increases with the contraction ratio of the Mould Cavity. Appropriately increasing either the holding pressure or the filling pressure of the Mould Cavity reduces the variation in the transverse shrinkage of the step-contracted cross-section. Moreover, using the ceramic/binder mixture with a composition similar to that of critical solid loading can lower the internal stress caused by sintering in the vicinity of the step-contracted cross-section.
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shrinkage properties of ceramic injection Moulding part with a step contracted cross section in the filling direction
Ceramics International, 2004Co-Authors: Renhaw Chen, Chi Hung HoAbstract:The need for ceramic materials in microelectromechanical systems (MEMS) is increasing quickly. A typical form of designed ceramic micro parts involves the structuring of several micro columns and/or thin walls on a substrate. This work considers the use of a model Mould with a straight Mould Cavity and a step-contracted cross-section in the filling direction. The injection Moulding of such of ceramic micro part is experimentally simulated. The effect of the Mould Cavity contraction ratio, Moulding conditions, and the solid loading of the ceramic/binder mixture on the distribution of the transverse shrinkage of the Moulding parts at Moulded, debinded, and sintered stages, respectively, are examined. Experimental results reveal that transverse shrinkage of the region downstream from the step-contracted cross-section clearly exceeds that of the region upstream in all three stages. Furthermore, transverse shrinkage varies greatly in the plane of the step-contracted cross-section. The magnitude of the variation in transverse shrinkage in the step-contracted cross-section increases with the contraction ratio of the Mould Cavity. Appropriately increasing either the holding pressure or the filling pressure of the Mould Cavity reduces the variation in the transverse shrinkage of the step-contracted cross-section. Moreover, using the ceramic/binder mixture with a composition similar to that of critical solid loading can lower the internal stress caused by sintering in the vicinity of the step-contracted cross-section.
Rupinder Singh - One of the best experts on this subject based on the ideXlab platform.
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Process Capability Study of Rapid Casting Solution for Aluminium Alloys using Three Dimensional Printing
International Journal of Automotive and Mechanical Engineering, 2011Co-Authors: Rupinder SinghAbstract:In the present work best shell wall thickness of Mould Cavity has been investigated for process capability study of rapid casting solution for aluminum alloys using three dimensional printing (3DP). Starting from the identification of component/ benchmark, aluminum-alloy casting prototype was produced at different shell wall thickness with three dimensional printing. The results of the study suggests that at best shell wall thickness (5mm) for aluminum alloys, rapid casting solution using 3DP process lies in ±3.999 sigma (@) limit.
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Effect of Work Piece Dimensions on Cost Effective Hybrid Rapid Casting Solution for Aluminium Alloy
Advanced Materials Research, 2011Co-Authors: Rupinder SinghAbstract:The purpose of the present experimental investigations is to study the effect of work piece dimensions on reducing the shell wall thickness of Mould Cavity for cost effective, hybrid rapid casting solution of aluminum alloy. Starting from the identification of component/benchmark, technological prototypes with three different work piece dimensions (volume/ weight) were produced, at different shell wall thickness of Mould Cavity using hybrid rapid prototyping technique (combination of three dimensional printing and conventional sand casting). Measurements on the coordinate measuring machine helped in calculating the dimensional tolerances of the castings produced. Some important mechanical properties were also compared to verify the suitability of the castings. The study suggested that the shell wall thickness, having value less than the recommended one is more suitable from dimensional accuracy and economic point of view, for all three work piece dimensions (volume/ weight). Further best shell wall thickness of the Mould Cavity for different work piece dimensions of the selected benchmark has been highlighted for rapid casting solution of aluminum alloy.
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Effect of Moulding Sand Properties on Cost Effective Hybrid Rapid Casting Solution for Zinc Alloy
Advanced Materials Research, 2011Co-Authors: Rupinder SinghAbstract:The purpose of the present experimental investigations is to study the effect of Moulding sand properties on reducing the shell wall thickness of Mould Cavity for cost effective, hybrid rapid casting solution of zinc alloy. Starting from the identification of component/benchmark, technological prototypes were produced, with three different Moulding sands (dry, green and molasses), at different shell wall thickness of Mould Cavity using hybrid rapid prototyping technique (combination of three dimensional printing and conventional sand casting). Measurements on the coordinate measuring machine helped in calculating the dimensional tolerances of the castings produced. Some important mechanical properties were also compared to verify the suitability of the castings. The study suggested that for the shell thickness, having value less than the recommended one is more suitable from dimensional accuracy and economic point of view, for all three Moulding sands. Further best shell wall thickness of the Mould Cavity for different Moulding sands, for the selected component/benchmark has been highlighted for rapid casting solution of zinc alloy.
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Study of statistically control rapid casting solution of aluminium alloys using three dimensional printing
International Journal of Precision Technology, 2011Co-Authors: Rupinder Singh, J. P. SinghAbstract:The purpose of the present investigations is to study the feasibility of decreasing the shell wall thickness of Mould Cavity for economical and statistically controlled rapid casting solution of aluminium alloy using three dimension printing technology. Starting from the identification of component/benchmark, technological prototypes were produced at different shell wall thickness of Mould Cavity. Measurements on a coordinate measuring machine helped in calculating the dimensional tolerances of the castings produced. Some important mechanical properties were also compared to verify the suitability of the castings. The study suggested that the shell wall thickness, having value less than the recommended one is more suitable from dimensional accuracy and economic point of view. The result indicates that for the selected component/benchmark, at best set shell wall thickness (5 mm) of Mould Cavity, strong possibilities are observed for the process under statistical control in case of aluminium alloy.
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Investigations for statistically controlled rapid casting solution of low brass alloys using three dimensional printing
International Journal of Rapid Manufacturing, 2009Co-Authors: Janhavi Singh, Rupinder SinghAbstract:The purpose of the present investigations is to study the feasibility of decreasing the shell wall thickness of Mould Cavity for economical and statistically controlled rapid casting solution of low brass alloy using three dimension printing technology. Starting from the identification of component/benchmark, technological prototypes were produced at different shell wall thickness of Mould Cavity. Measurements on a coordinate measuring machine helped in calculating the dimensional tolerances of the castings produced. Some important mechanical properties were also compared to verify the suitability of the castings. The study suggested that for the shell thickness, having value less than the recommended one is more suitable from dimensional accuracy and economic point of view. The result indicates that for the selected component/benchmark, at best set shell wall thickness (2 mm) of Mould Cavity, hardness of the casting improves from recommended 12 mm. Also production cost and production time has been reduced by 40.05% and 32.84% respectively in comparison to 12 mm recommended shell thickness. Further, strong possibilities are observed for the process under statistical control for 2 mm shell thickness the in case of low brass alloy castings.
Chang Wang - One of the best experts on this subject based on the ideXlab platform.
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Applications on Nanocomposite Coating Technology in Plastic Injection Mould Cavity Surface Treatment
Advanced Materials Research, 2011Co-Authors: Bin Wang, Chang Wang, Jing Li, Xiu Xin HuAbstract:Nano surface engineering is a protection technology using nanometer material and nanometer technology, pointing at failure forms, characteristics and mechanism, comprehensively using a variety of traditional surface engineering technology. Nanocomposite coating technology which develops on the basis of the traditional composite coating technology was briefly introduced in the article. The research of application nanocomposite coating technology in plastic injection Mould Cavity surface treatment has just started. The nanocomposite coating technology was compared with the ordinary nickel electro-brush coating and the basic approach which realizes nanometer on the Mould Cavity was described. The advantages of nanocomposite coating were comprehensively and effectively explained. It can increase the coating thickness and hardness, improve the abrasive resistance, fatigue resistance and corrosion resistance of the plastic injection Mould Cavity, thereby enhancing the service life of Mould.
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ICDMA - Applications of Rare-Earth Thermal Diffusion Technology in Plastic Injection Mould Cavity Surface Treatment
2011 Second International Conference on Digital Manufacturing & Automation, 2011Co-Authors: Chang WangAbstract:Rare-earth thermal diffusion technology is an emerging technology, which is based on the traditional surface engineering technology. The article briefly introduces appLications of rare-earth thermal diffusion technology in plastic injection Mould Cavity surface treatment and detailedly expatiates the basic processes and conditions about rare-earth thermal diffusion technology. Compared to the traditional thermal diffusion technology witHout rare-earth, it comprehensively shows the advantages of rare-earth thermal diffusion technology, which includes embodying effective catalyze permeabiLity, increasing diffusion layer thickness and diffusion layer hardness and improving service Life of the plastic injection Mould.
Yan Qing-song - One of the best experts on this subject based on the ideXlab platform.
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Microstructure and properties of vacuum counter-pressure cast aluminum alloy
2006Co-Authors: Yan Qing-songAbstract:The microstructure and properties of vacuum counter-pressure cast aluminum alloy were studied. Results indicated that under the condition of vacuum counter-pressure, liquid melts fill Mould Cavity under the vacuum and crystallize under high pressure which have very good effect on nucleation and solidification feeding. Compared with gravity casting, the microstructure of vacuum counter-pressure cast aluminum alloy is much finer and more uniformly distributed. Mechanical properties of vacuum counter-pressure cast aluminum alloy are improved significantly.
