Development of Rapid Prototyping Technique for Metallic Components

点击翻译按钮获取中文摘要

Conventional manufacturing for metal castings consists of many processes such as the preparation of sand mold, casting the melt and the shake-out of the sand mold, which needs a lot of man-power and a long production time. Therefore, a reduction in man power and production time as well as a lowering in the cost has been requiredLayered manufacturing (or solid freeform fabrication) has been investigated by many researchers to produce a prototype made of plastics for metallic mold. Recently layered manufacturing method is called as rapid prototyping technique and has attracted considerable attention as a new nearnet manufacturing technology for metallic parts. In early stage, rapid prototyping method has been applied to plastic products, which have low mechanical properties and hence a poor endurance.In our earlier works, which started 1995 at the same time the works began in USA and Germany, a fused spinning deposition method(FSD) which is one of RP technologies, has applied to the fabr … More ication of metallic parts.In the previous works, the optimum conditions to control the shape of aluminum base and copper base alloy castings produced by FSD method have been investigated for the cylindrical and rectangular shaped hollow tube and solid castings In addition, the data-base for the process parameters to control fundamental shapes has been constructed and castings having a fundamental shape of the practical metallic components, such as pyramid shape,, wine glass shape, piston shape and castings with the inside through-holes like turbine-blade have been fabricated as application by combining the fundamental shape control parameters.In the present work, in order to promote the feasibility of FSD method to various metal and alloy castings having a complex 3D shape, some modification was performed to a conventional FSD apparatus. The process parameters to obtain a double layered tube castings consisting of different inner and outer materials and a large scale casting using a multi -nozzles injection system have been examined. From the results obtained, a fundamental knowledge and know-how of apparatus components and of the shaping conditions including process parameters for the fabrication of various alloy castings has been obtained. Less