RAPID PROTOTYPYING A NEW CONCEPT IN MANUFACTURING

Abstract

Rapid Prototyping (RP), e.g. Stereolithography - a new concept in manufacturing can generate 3D models directly from 3D Computer Aided Design model data, making a design tangible within a short period of time. In the design developing process, RP dramatically reduces time and cost. Compare with the conventional machining method, the RP technology has many of advantages such as: no tooling preparation time, no fixture cost, reduce design iteration time by utilizing the simultaneous engineering, able to build the extremely complex model which can not be manufactured on CNC machine because of undercut problem, as well as to apply computer integrated manufacturing concept by helping of computer network at any place in over the world. Increasing design standards and shortening product life cycle create new demands to the product development. Using RP is one optimum option to gain the desired quality and productivity improvement in product design. Accuracy, cost, surface finish and material used are different from process to process. Launched in 1997, RP today is representing already more than 30 different technologies. This paper was the first step to develop a methodology that helps the practice to select the best technology for the specific prototyping problem. A plastic injection moulding part was designed as a test model. Then prototypes were made with several technologies (SLA,SLS) a Silicone rubber mould and a resin casting part of "an upper half of mobile telephone" were produced. Evaluation for the whole process was made to analyze the accuracy, time and cost of each process.