China Plastics ›› 2025, Vol. 39 ›› Issue (5): 50-56.DOI: 10.19491/j.issn.1001-9278.2025.05.008

• Processing and Application • Previous Articles     Next Articles

Analysis of factors affecting warping and deformation of composite⁃integrated over⁃molding flat products

YING Qihui1,2(), JIA Zhixin1(), GAO Lizhen1,3, LIU Lijun1, LI Jiqiang1, WU Xiran1,2, CHEN Bojie4   

  1. 1.School of Mechatronics and Energy Engineering,NingboTech University,Ningbo 315100,China
    2.School of Mechanical Engineering,Zhejiang University,Hangzhou 310012,China
    3.School of Mechanical Engineering,Zhejiang Sci?Tech University,Hangzhou 310018,China
    4.Ningbo Institute of Measurement and Testing,Ningbo 315100,China
  • Received:2024-06-19 Online:2025-05-26 Published:2025-05-22

Abstract:

Integrated over⁃molding is based on a combination of hot press and injection molding processes. Owing to the different shrinkage rates of materials, the molded products formed a “bowl⁃shaped” structure with a concave center and warped sides after cooling and shaping. To investigate the preheating time of prepregs, mold temperature, melt temperature, injection speed, injection pressure and holding pressure, an orthogonal experiment was designed to analyze the influence of process parameters on the warping and deformation of the molded products. The results indicated that the preheating time had a significant effect on the warpage deformation, whereas the injection speed showed a smaller effect. Through the signal⁃to⁃noise ratio analysis, the influence of each factor on the warpage of composite products was followed by by an order of preheating time>holding pressure>injection pressure>melt temperature>mold temperature>injection speed. The optimal process parameters were obtained for manufacturing composite products with small warpage.

Key words: composite material, warp deformation, process parameter, integrated over?molding, signal?to?noise ratio

CLC Number: