光ファイバで紫外線を導光した光造型機の開発と石こう鋳造への適用

概要

論文の詳細を見る
Photofabrication is a rapid prototyping process that produces patterns easily and quickly. Patterns are composed of multilayer photopolymer cured by laser or ultra violet ray. As laser devices are expensive, they have not been widely adopted. The exposure device in this paper used a mercury xenon lamp with an ultraviolet rays irradiated through optical fibers. 200 and 400 μm fibers were used for the exposure device, but it was found that the 200 μm fibers were superior to 400 μm fibers for laminated patterns. Three kinds of photopolymer were used for the investigation. These are urethane (M30), an urethane and unsaturated polyester mixture (FP50), and an unsaturated polyester (G42). Cured resin patterns in plaster molds were heated at 873K × 10.8ks. The heated resin patterns disappered and small amount of ash was observed. AC4C aluminum alloy were poured into these molds by centrifugal casting. No cracks were observed in the molds with FP50 and M30 patterns, and fine castings were obtained. Molds with G42 patterns generated cracks due to thermal expansion of the pattern and surface of AC4C castings inferior good compared with the castings of the FP50 and M30 patterns.
Japan Foundry Engineering Societyの論文