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Warpage Reduction Through Robust Engineering of a Thin-Walled Injection Molded Component

[+] Author Affiliations
Steven J. Sobolak, Badih A. Jawad

Lawrence Technological University, Southfield, MI

Paper No. IMECE2007-42775, pp. 67-73; 7 pages
doi:10.1115/IMECE2007-42775
From:
  • ASME 2007 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing
  • Seattle, Washington, USA, November 11–15, 2007
  • Conference Sponsors: ASME
  • ISBN: 0-7918-4297-5 | eISBN: 0-7918-3812-9
  • Copyright © 2007 by ASME

abstract

An L18 Taguchi experiment was used to determine the robust processing control factor settings to maximize dimensional stability and reduce warpage for a 3-dimensional thin-walled injection molded component. The robust control factor settings were determined for seven control factor settings and also included three noise factors. The noise factors were: wall thickness, glass fiber content and production cycle pull point. A scientific molding technique where an on-line rheology study was performed to determine the relative viscosity versus effective shear rates was used to determine the injection speed settings. The proper shot size was also established for each experiment. A laser measuring system was used to analyze the entire component and to determine the shrinkage rates and warpage of the component. A warpage index was created to determine the entire warpage of the component.

Copyright © 2007 by ASME
Topics: Warping

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