Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
권호 표지

A Study on the Warpage in Injection Molded Part for Various Rib Design and Reinforced Resins

보강 수지의 종류와 사출성형품의 리브 설계에 따른 휨의 연구

  • Lee, Min (School of Mechanical and Automotive Engineering Technology Div.of Mechanical Engineering, Yeungnam College of Science & Technology) ;
  • Lee, Chun-Kyu (Div. of Mechanical Engineering, Kongju National University)
  • 이민 (영남이공대학교 기계자동차학부 기계계열) ;
  • 이춘규 (공주대학교 기계공학과)
  • Received : 2012.03.13
  • Accepted : 2012.05.25
  • Published : 2012.06.29
Download PDF
⟨ Previous Next ⟩

Abstract

Most of the plastics products have been manufactured by injection molding. Molding trouble in injection-molded parts is caused by changing a molding product and molding process condition, etc. In this study, warpage in the injection molded part have been studied. Specimens are rectangular flat shape with and without ribs. Non-crystalline resins (ABS+GF30%, PC+GF30%) and crystalline resins (PP+GF30%, PA66+GF30%) were used for material. Flat shape ribs showed higher warpage than flat shape without rib by 10 to 41%. the specimens with ribs that are located parallel to flow direction has higher warpage than the specimens with rib that are located perpendicular to flow direction by 11 to 50%. crystalline resins have higher warpage than non-crystalline resins by 22 to 78%. Warpage decreases as packing time increases as injection temperature increases.

Keywords