Papers by Keyword: Thin Wall Injection Molding

Abstract: The objective of this paper consists in the determination of the flow front length using o circular spiral mold. The paper also studies the influence of the process parameters on the flow front length using the method of statistical analysis. For this purpose, a number of numerical simulations are carried out by utilizing the combination of four process parameters (i.e., the melt temperature, the spiral thickness, the injection pressure and the mold temperature) at three levels. In order to reduce the number of numerical simulations, a simplistic Taguchi L₂₇ orthogonal array was chosen. The material chosen for this study was a low density polyethylene and a high density polyethylene. The flow front length was measured through a marked pattern of the circular spiral using the AutoCAD.

Abstract: A relationship of residual stress distribution and surface molding states on polymeric materials is presented in thin-walled injection molding. The residual stress is computed by computational numerical analysis, observed with stress viewer and birefringence. The residual stress on polymeric parts can allude the surface quality as well as flow paths. The residual stress distribution on polymeric parts is related with thickness, gate layout, and polymer types. Molecular orientation on polymeric parts is also important in thin wall injection molding. The residual stress and molecular orientation are related to the surface molding states intimately. Analysis of the residual stress is validated through photo-elastic method and surface molding states..

Abstract: The electricity is the most important motive power in the world for the economy and the industry. But today the electricity is always generating by natural gas, oil, and coal, hence environment pollution caused by fossil fuel will be more serious, and crude oil will be used up in 40-50 years (according to the report of Statistical Review of World’s Energy’s Research), it is need to develop a high efficiency and zero-emission in new energy.

Abstract: Residual stress distribution and surface molding state of polymeric materials are presented for thin-walled injection molding. The residual stress is computed by computational numerical analysis, observed with a stress viewer and birefringence. The residual stress on the surface of the polymeric part can indicate the surface quality as well as flow paths. The residual stress distribution of the polymeric part is related with the part’s thickness, the gate layout, and the polymer type. Molecular orientation, affected by flow paths, is simulated and validated by observing the birefringence of the polymeric specimens. The residual stress and molecular orientation are closely related to the surface molding states.