Effects of Mold Surface Roughness on Compressible Flow of Micro-Injection Molding

   be obtained as [5] Thus, the vol a surface roughness is δ=3S . ume fraction can he effective roughness height (δ) in terms of the average T to represent the physical surface roughness of the homogeneous pyramid roughness profile he equivalent three surface roughness. T -dimensional as the parameter to characterize the surface profilometer, , which can be measured easily using 3D a average roughness S , we employed Following Ong et al [5] the three dimensional implementation can be found in our previous paper domain Tait equation of state. Details of the numerical the compressible behavior was assumed to obey the two modeled using the widely accepted Cross The rheological behavior of the polymer melt was method. captured field and the melt front was using the control volume to calculate the pressure/ temperature approach was employed was and surface roughness obtained. A hybrid FEM/ FDM model which incorporates the polymer melt compressibility . The modified generalized Hele and Chiang et al [7-8] -Shaw follow the method of Hieber and Shen In this study, we [6] ODELLING II. M micro-thickness cavity. surface compressibility and mold roughness on the filling of and numerically the effect experimentally s of polymer melt compressibility and surface roughness, we elucidate Shaw approximation and takes into considerations the Helehouse code which adopts the 2.5D By developing our inand melt compressibility roughness are yet to be addressed. results. However, the combined effect obtained good agreement between experimental and simulated old filling into micro roughness on m -disked part and had numerically and experimentally the effects of surface ecently, this research group be ignored. R [1-5] investigated relative to the other dimensions of the mold and thus could not surface roughness could become significant micro-parts, However, as the cavity of macro-parts. dimensions decrease in