• Volumetric shrinkage estimation of benchmark parts developed by rapid tooling mold insert

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      https://www.ias.ac.in/article/fulltext/sadh/045/0139

    • Keywords

       

      Benchmark parts; injection molding; volumetric shrinkage; regression technique

    • Abstract

       

      This paper estimates the volumetric shrinkage for thermoplastic Polypropylene (PP) injection molded components made using digital Acrylonitrile butadiene styrene (ABS) mold. The parameters affecting volumetric shrinkage for the digital ABS mold are mold temperature and injection temperature, cooling time,hold pressure and injecting speed. Therefore, twelve standard benchmark CAD model were selected with different geometric attributes. Subsequently, simulation analysis was performed on all CAD model using MoldflowÒ (MFA) simulation software. Additionally, regression analysis is applied to identify the effect ofinjection molding parameters on the volumetric shrinkage of part made using rapid tooling mold insert of digital ABS material. It is found that maximum volumetric shrinkage (18.75%) is observed for square pyramid frustum,conical frustum, and solid torus. On the contrary, hollow rectangular prism shows minimum shrinkage effect having 12.61% of volumetric shrinkage. This study predicted that shrinkage is the main concern for these three geometric features (i.e., square pyramid frustum, conical frustum, and solid torus) and must be looked for its minimization. The results are experimentally validated, with 3D scanner integrated with COMET plus and Inspect plus softwares. Since shrinkage estimation for digital ABS mold using Rapid Tooling technique has notbeen attempted before, therefore, this study provides guidance for the optimum parameter selection and assigning suitable shrinkage compensation values for digital ABS mold made using direct rapid tooling

    • Author Affiliations

       

      SAGAR KUMAR1 AMIT KUMAR SINGH

      1. Department of Mechanical Engineering, Malaviya National Institute of Technology, Jaipur 302017, India
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