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정만석,김성훈 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.5
CAE(Computer Aided Engineering) simulations of thin-wall injection molded parts of thermotropic liquid crystal polymer and common thermoplastics were performed. Micro-injection molded parts composed of thermortopic liquid cyrstal polymer are widely used in electronics and tole-communication terminals. The present paper deals with the development of efficient formulation for numerical integration, by which problems involving thin complex injection molded products can be solved to predict residual stresses, shrinkage, and warpage. Parameters of processing condition (material, thickness, packing pressure, flow rate, cooling stage, and mold temperature) result in diverse variations of residual stresses, total deflection, and warpage shape. The optimal processing conditions are obtained for the least warpage and internal stress of LCP micro-injection molded parts.
정만석,김성훈 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.8
CAE (computer aided engineering) simulation of thin-wall injection molded parts was investigated using commodity thermoplastics and thermotropic liquid crystal polymers. Micro-injection molded parts using thermotropic liquid cyrstal polymer are widely used in the electronics and telecommunication terminals. During the filling process at injection molding, the shape of the viscosity distribution across the cavity is a consequence of its dependence on both shear rate and temperature. viscosities of the materials used may have an important effect on the level of molecular organization, a transitory structure, and ease of processing. Using the modified power law model for melt viscosity in the simulation, the strength of weld line and the capability of short shot have been determined. The best location of the gate in the micro-injection molded thin parts was found to be at the middle of the products.
정만석,김성훈 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.6
DIMM(dual inline memory module) is widely employed in personal computers. The maximum warpage of the injection molded connectors should be minimized to be compatible with SMT (surface mount technology) process. CAE(computer aided engineering) simulation of thin-wall injection molded parts was investigated using commodity thermotropic and thermotropic liquid crystal polymers. During the filling phase in injection molding, the shape of the viscosity distribution across the cavity is a consequence on both shear rate and temperature. Cooling stage affects many parameters of the process This research deals with the development of an efficient for mulation for numerical, by which problem involving thin complex injection molded products (DIMM soket) can be solved to predict residual strees, shrinkage, and warpage.