Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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A study on the warpage in injection molded part for various rib design

사출성형품의 리브 설계에 따른 휨의 연구

  • Lee, Min (Graduate School of Industry and Engineering, Seoul National University of Technology) ;
  • Lyu, Min-Young (Dept. of Precision Mechanical Engineering, Seoul National University of Technology)
  • 이민 (서울산업대학교 대학원) ;
  • 류민영 (서울산업대학교 정밀기계공학과)
  • Received : 2008.05.08
  • Accepted : 2008.07.25
  • Published : 2008.08.01
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Abstract

Warpage, which is one of the molding trouble, acts as possible factor which results in defect in assembly. In this study, a mold was designed to produce specimens with rib parallel to flow direction, specimens with rib perpendicular to flow direction and specimens without rib. This work researched change of warpage according to injection molding condition such as injection pressure, packing pressure, packing time, resin temperature, mold temperature in non-crystalline resins(PC, ABS), crystalline resins(PP, PA66), and 30% glass fiber reinforced-resins(PC, ABS, PP, PA66).Specimens with rib and Crystalline resins show more warpage than specimens without rib and non-crystalline resins, respectively. Glass fiber reinforced-resins and specimens with rib parallel to flow direction show smaller warpage than conventional resins and specimens with rib perpendicular to flow, respectively. Specimens with rib and specimens without rib show reduced warpage as packing time increases. In addition, warpage increase as resin temperature increases. It is found that CAE shows similar tendency with experiment as packing time, resin temperature. when the rib is caused, warpage will reduce and prevent the transformation. product of a irregular form occurs warpage. In the study It'll be basic data that product occurs warpage, preferablity.

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