Influence of Anisotropic Thermal Expansion on Angular Deformation of Injection Molded L-Shaped Parts

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  • L字形状射出成形品の内反り変形に与える熱膨張異方性の影響

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The most important and fundamental shape in injection molded parts is the L-shape. Information about the mechanism by which the angle of the corner of this shape deforms is also valuable for understanding the warpage mechanism of injection molded parts. In this study, we investigate the relationship between the deformation angle of L-shaped parts and thermal expansion coefficient (TEC) anisotropy, particularly for fiber-reinforced thermoplastics.<BR>A theoretical estimate of the angular deformation of an L-shaped part compared to a finite element analysis (FEA) simulation using a TEC anisotropic model indicate that the angular deformation of L-shaped parts is proportional to the difference between the TEC values in the normal direction and the mold direction. The results also show that experimental angular deformations can be predicted using FEA simulations with sufficient accuracy for use in industry.

Journal

  • Seikei-Kakou

    Seikei-Kakou 23 (4), 235-241, 2011

    The Japan Society of Polymer Processing

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