Quality control is an important aspect of manufacturing processes. Product quality of injection molded parts is influenced by the injection molding process. In this study statistical tools were used to develop a model that relates injection molding process variables to part quality. A statistically based model predictive control algorithm was developed for controlling part quality with manipula...

An injection molding process was characterized with respect to certain physical characteristics of an injection molded part. The produced part, the “Triconnector”, is a planar Lego-like piece, which was shot from ABS thermoplastic on a Morgan-Press G-100T Injection Molding Machine. Using statistical design of experiments, we identified the most significant parameters affecting part quality. The...

In the manufacturing of injection-molded plastic parts, it is essential to perform a non-destructive (and, in some applications, contactless) three-dimensional measurement and surface inspection part monitor quality. The method depends strongly on shape optical properties part. this study, high-precision (±5 µm) high-speed system (total 24 s for complete dimensional measurement) was developed m...

Polyethylene wear increasingly has been blamed for osteolysis and granuloma formation after total joint arthroplasty. The authors evaluated the wear difference between bearing surfaces of stainless steel, cobalt chrome, and titanium alloy. They also compared cemented all-polyethylene molded cups with cemented metal-backed molded acetabular cups. These were compared with molded and machined poly...

Power density producing damage at a probability of 0.5 (ie, damage threshold, DT-50) was determined for PMMA (with/without UV absorber) and Silicone intraocular lenses. Scattered light from a collinear diagnostic He:Ne beam was one of four damage monitors deployed to enhance the sensitivity of the system. In order of increasing laser resistance the following results were obtained: injection mol...

An interactive computer-based design system is developed to eliminate the need for costly iterations of protype tooling in injection molding. A knowledge-based synthesis system is constructed to embody the principle of a rational design strategy for injection molding by combining a rule-based expert system with process analysis programs. The thermomechanical properties of a molded part are pred...

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...

Improvements in passenger compartment comfort continue to be one of the key needs of the global transportation industry. Since their introduction more than 40 years ago, flexible molded polyurethane foams have successfully contributed to the comfort provided by all forms of transportation seating. Initially required to provide just a wide range of load bearing, seating foams are now being desig...