Numerical and experimental investigation of shrinkage behavior of precision injection molded articles. I. Development of lateral motion modeling

2008 ◽  
Vol 48 (8) ◽  
pp. 1555-1568 ◽  
Author(s):  
Sang Sik Yang ◽  
Tai Hun Kwon
Keyword(s):  
Experimental Investigation ◽  
Lateral Motion ◽  
Motion Modeling ◽  
Injection Molded ◽  
Shrinkage Behavior

Experimental investigation of green brick shrinkage behavior with Bigot’s curves

2016 ◽  
Vol 34 (13) ◽  
pp. 1535-1545 ◽  
Author(s):  
Ebru Mancuhan ◽  
Selin Özen ◽  
Perviz Sayan ◽  
Sibel Titiz Sargut
Keyword(s):  
Experimental Investigation ◽  
Green Brick ◽  
Shrinkage Behavior

An Experimental Investigation of a Micro Injection Molded Mechanical Device

2005 ◽  
Author(s):  
Alan M. Tom ◽  
Aleksandar K. Angelov ◽  
John P. Coulter
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Injection Molding ◽  
Processing Parameters ◽  
Primary Objective ◽  
Crystalline Materials ◽  
Reduced Modulus ◽  
Molded Parts ◽  
Secondary Objective ◽  
Injection Molded

The primary objective of this study, through a scientific experimental investigation, was to determine optimum injection molding processing parameters on semi-crystalline materials HDPE and POM focusing on mechanical properties, obtained thru the use of a nano-indenter, of micro gears being manufactured on non-heated and heated mold bases. A secondary objective was to initiate a similar experimental study using amorphous COC material. Taguchi’s method utilizing an L-9 orthogonal array was used to determine the effects of Tnoz, Tmold, Pinj, Vinj, Ppack, and tpack injection molding processing parameters. A nano-indenter was used to determine investigated mechanical properties on final injection molded parts that included stiffness (S), reduced modulus (Er), and hardness (H). Results showed HDPE, POM and COC, heated mold experiments exhibiting increases in mechanical properties S, Er, and H, on the order of 1.2–4.0 times those of non-heated molding trials. Decreases in optimum molding conditions for Tnoz, Pinj, and Ppack was also observed for heated molding trials. The highest mold temperatures and injection pressures tested did not produce greatest optimum molding conditions. However, largest packing times tested produced optimum molding conditions.

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