Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (12): 58-63,85.

• Mechanical Engineering • Previous Articles     Next Articles

Secondary-Phase Shear Effect in Ultra-Thin Injection Molding Process

Yin Su-feng1  Ruan Feng1  Wang Jian-yu2   

  1. 1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2. Dongguan Yidong Electronic Co.,Ltd.,Dongguan 523106,Guangdong,China
  • Received:2012-05-18 Revised:2012-08-05 Online:2012-12-25 Published:2012-11-02
  • Contact: 殷素峰(1971-) ，男，博士生，主要从事模具计算机技术及特种塑性成型研究． E-mail:yinsf1971@sina.com
  • About author:殷素峰(1971-) ，男，博士生，主要从事模具计算机技术及特种塑性成型研究．
  • Supported by:

    广东省建设现代化产业体系技术创新滚动计划项目( 2009863024) ; 粤港关键领域重点突破项目( 2009205200001)

PDF

931

Abstract:

In order to overcome the difficulties existing in ultra-thin injection molding,the concepts of primaryphase and secondary-phase shears are defined,and the shear field of ultra-thin injection molding is analyzed. Then,based on the Poiseuille equation,the effects of the secondary-phase shear on the apparent viscosity and the apparent shear stress in the ultra-thin injection molding process are discussed in detail through slit rheological experiments,and the relationship between the secondary-phase shear and the viscous heating on the one hand and the gate pressure on the other is analyzed,finding that the secondary-phase shear effectively improves the melt filling during the ultra-thin injection molding. Moreover,a mixed network method is presented for the design of ultra-thin light guide plates,which helps to form secondary-phase shear in the melt-flowing plane and effectively improves the filling rate of products. The theoretical correctness of the secondary-phase shear effect is finally verified by experiments.

Key words: ultra-thin injection molding, secondary-phase shear, rheological experiment, light guide plate