Plastic casing in medical equipment: Evaluation of 3D design and molding simulation

Abstract

The aim of this paper is to present mechanical design solutions and verification techniques for the most complex plastic parts composing the digital electrocardiograph CARDIOCID T50/S100 and the vital sign monitor DOCTUS VIII. The most important manufacturing details were analyzed as well as the simulation of the mold injection process, in order to obtain the accurate vision of the problems that may arise. The details of the dynamic study of the different design solutions before the parts injection are also exposed. This practice optimizes time in the development of the mold, and consequently reduces the final product costs. By using Moldflow simulation package the 3D models were performed, testing the validity of technological parameters such as draft angles, possible areas of material shrinkage (shrinkage cavities) and others. The final results of the process are presented, from the injected parts, corroborating calculations made in the design stage. This methodology proves to be a highly effective and essential tool as a way to avoid mistakes and improve solutions. Modern designs are obtained, with quality, speed and safety.