Performance analysis of vapour finishing apparatus for surface enhancement of FDM parts

Abstract

Additive manufacturing is one of the most useful technologies that have been studied by many researchers in terms of the ability to create complex geometries, eliminating wastages, reducing human interventions etc. Fused Deposition Modeling (FDM) is one of the most commonly used manufacturing technology due to easy fabrication process, flexibility of materials, accuracy and portability. It has the potential to generate complex geometrical shapes within few hours and such printers are adaptable and fulfil the desired needs of the present demands. But the poor surface characteristic is one of the barriers that need to be focused on for commercialization of products. As an extension to approaches adopted to overcome the surface issues, a dedicated finishing apparatus was developed and tested for efficacy. It was found that hot chemical vapours mixed with heated air fastens the vapour smoothing process and yields excellent surface finish. The experiments were conducted and it was experienced that higher temperature and time of mild chemical vapours resulted in better surface finish (maximum 89% improvement). Permanent weight gain in Acrylonitrile butadiene styrene (ABS) parts was noted with increase in finishing time which could hinder its usability.