テキスタイルコンポジットチューブの熱成形による球バルジ加工

概要

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This paper deals with deformation characteristics of textile composite tubes in spherical shape thermoforming process. The composite tubes are made of cowoven braid, which consists of polyamide resin and carbon braid with thin thickness and high fiber volume fraction, and are fabricated by internal pressure bonding method. Spherical shape closed dies of two different sizes are used in the experiment. The specimen is deformed at a temperature that makes the specimen soft enough to be deformed. Several combinations of internal pressure and axial displacement, which are controlled by a personal computer, are applied to the specimen during forming. An expression to predict a required axial displacement for the forming was derived from geometric deformation model of a braid. A spherical shape part being about two times as large as original tube diameter is obtained under suitable forming conditions. Calculated axial displacements agree with experimental results. It is proved that the derived equation is valid to predict required axial displacements for spherical shape forming. Experimental results reveal that this forming process has a potential as one of thermoforming techniques for the composite tubes.
社団法人日本機械学会の論文
1999-08-25