Abstract
Ring compression tests were carried out to clarify the friction behavior occurring at tool/work material interfaces in micro/meso-scale metal forming. The minimum size of the ring used was 0.6mm in outer diameter. In the case of the test using lubricant oil, the friction coefficient is larger as the ring size becomes smaller. In the case of dry test, the more scattered results were obtained as the ring size becomes smaller, although the average of the coefficients does not vary with the ring size.
