射出成形冷却過程における金型内樹脂温度の測定と解析

概要

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The polymer temperature within the mold was measured with a specially designed thermocouple sensor for validating results computed by a cooling analysis program, which is one of the CAE (computer-aided engineering) programs in injection molding. The thermocouple consisted of 0.1mm dia. chromel/alumel elements and a 8mm dia. Teflon rod, which was used to hold the thermoelements at the gapwise center of the cavity and insulate them from each other and from the mold. The thermojunction was exposed and immersed into the cavity far enough to avoid thermal conduction error. A one-dimensional unsteady heat conductive equation was solved by the finite difference method with consideration of the latent heat and the contact heat transfer between the polymer and mold. Computed cooling curves were compared with experimental ones for various cavity thicknesses and two materials, polystyrene and polypropylene. The predicted minimum cooling times, which were defined as the necessary time for the polymer melt to be cooled to the solidification temperature at the center of the thickness, were in good agreement with the experimental ones for polystyrene, but were about 1.3 times for polypropylene.
一般社団法人日本機械学会の論文
1991-08-25