Estudos de caso da injeção de cera e da injeção de borracha no design de joias: uma contribuição da engenharia de precisão

Abstract

The jewelry design deals not only with aesthetic considerations, but also with objects of complex geometry and narrow tolerances that demand adjustments in the productive processes. Thus, Precision Engineering helps to optimize the production process of jewelry, guaranteeing the design specifications according to adjustments in the parameters of machinery and materials. This paper presents case studies on the injection of wax and rubber injection in the company BQZ, specialized in technological solutions and supply for the productive process in the jewelry industry. Quantitative tests were performed in ring molds to correlate the precision of the wax injection and rubber injection with the amount of noble material in the rings by evaluating the weight of the wax pieces. Also analyzed were the types of materials of the molds that receive the injected parts. The study showed that the increase of the injection pressure leads to the increase of the weight of the part, which, in turn, leads to the increase of the quantity of metal in the foundry, implying in the increase of productive and environmental cost. It has also been found that jewelry design with crimping, compared to jewelry and semi-jewelry with or without nailing, requires materials and processes of greater precision. Finally, it was noted that the precision and process technology implies a new work design, given a new insight into how to work with precision wax and rubber injectors.