Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (8): 45-48.

• Mechanical Engineering • Previous Articles     Next Articles

Prediction of Weldline Strength of Parts Fabricated by Sequential Injection Molding

Liu Yi  Ruan Feng  Feng Yang  Zhang Zu-jun   

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-06-27 Revised:1900-01-01 Online:2009-08-25 Published:2009-08-25
  • Contact: 刘毅（1979-），男，博士生，主要从事模具计算机技术的研究． E-mail:meliuyi@yahoo．cn
  • About author:刘毅（1979-），男，博士生，主要从事模具计算机技术的研究
  • Supported by:

    广州市科技计划项目（200722-D9091）

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Abstract:

:The welding strength of the parts fabricated by sequential injection molding was predicted based on the Sanchez-Lacombe lattice theory. Then, by considering the effects of both temperature and pressure distribution in the welding region on the bonding degree, the variation rules of welding strength of the parts in different weld line locations were predicted via numerical simulation. Experimental results indicate that （ 1 ） the predicted rules accord well with the actual ones; （2） the welding strength improves with the delay time of opening the valve gate; and （3） if the downstream valve gate does not open until the melt from the upstream valve gate passes it, the weldline strength is almost equal to that of the part in the location without weld line.

Key words: sequential injection molding, weldline strength, numerical simulation, valve gate