In this study, injection molding of three poly lactic acid (PLA) based bone screws was simulated and optimized through minimizing the shrinkage and warpage of the bone screws. The optimization was carried out by investigating the process factors such as coolant temperature, mold temperature, melt temperature, packing time, injection time, and packing pressure. A response surface methodology (RS...

In this study, we focus on making a double-sided metal plate with an internal structure, such as honeycomb. The stainless steel powder was used in the metal injection molding (MIM) process. The preliminary studies were carried out for the measurement of the viscosity of the stainless steel feedstock and for the prediction of the filling behavior through Computer Aided Engineering (CAE) simulati...

We demonstrate that fabrication of well-defined nanofluidic systems can be greatly simplified by injection molding of thermoplastic polymers. Chips featuring nanochannel arrays, microchannels and integrated interconnects are produced in a single processing step by injection molding. The resulting open channel structures are subsequently sealed by facile plasma-enhanced thermal bonding of a poly...

Lately, natural fibers have been gaining consideration in development of composites due to its biodegradability, availability and low-cost compared synthetic fibers. Natural are renewable sources, biodegradable, environmentally friendly effortless machinery. In this paper, the manufacturing production for fiber reinforced polymer composite (NFRC) will be reviewed. These including injection mold...

This paper presents the adaptation of a conventional injection molding process to the mass replication of polymeric microstructures with appropriate mold design and process control. Using wet-etched silicon wafers with microstructures on the surfaces as mold inserts, we have successfully predicted, improved and optimized the replication results. The flow behaviors of polymer melts in micro mold...

Microinjection molding is based on the concept of vario-thermal processing in which the injection unit heats the polymer and presses it into a micro featured mold. After the unit cools, the featured part is de-molded. An inherent problem with microinjection molding is poor feature replication. The polymer in the micro-cavity instantaneously freezes when it comes in contact with the mold wall th...

Title of Thesis: Computer Aided Design of Side Actions for Injection Molding of Complex Parts Ashis Gopal Banerjee, Master of Science, 2006 Thesis directed by: Associate Professor Satyandra K. Gupta Department of Mechanical Engineering Often complex molded parts include undercuts, patches on the part boundaries that are not accessible along the main mold opening directions. Undercuts are molded...