加熱小型ダイスによる高性能GFRTPねじの転造

概要

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A new form rolling technique to produce high performance GFRTP (glass fiber reinforced thermo plastic) thread by heating mini die is developed. GFRTP is widely used due to its superior properties, such as high strength, lightweightness, corrosion resistance and electrical insulation. Thus, the high performance GFRTP fastner is desired in various industrial fields. The form roling is a standard technique for metal threads. It is supposed that the form rolling of GFRTP rods, in which the glass fibers are arranged along the axis of rods, makes possible for fiber to flow into threads during form rolling period, and the cost effective high performance GFRTP bolts would be available. In order to obtain precise thread shape and high strength, it is considered that the material temperature should be higher than the glass transition temperature and ultrasonic heating has been applied in form rolling process. However, sufficient thread shape could not be obtained, because the high temperature of the inner part causes total material deformation and the forming pressure becomes small. To cope with this problem, a new heating mini die is designed to apply local heating and large local form rolling pressure. It, is found that the precise thread shape is achieved and the glass fibers flow into threads by the proposed heating mini die.
公益社団法人精密工学会の論文
1999-12-05