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문호균 Graduate School, Gyeongsang National Univ. 2005 국내박사
A three-dimensional rigid-plastic finite element method with various numerical schemes is presented for simulation of a ring rolling process and an orbital forming process. In the ring rolling process, an analysis model having relatively fine mesh system near the roll gap is used for reducing the computational time and a scheme of minimizing the volume change is applied. In the orbital forming process, a new approach to reducing volume change during simulation is presented and an approximation method to reduce computational time is also presented. The formation of the central cavity formation defect in ring rolling of a taper roller bearing outer race and the polygonal shape defect in ring rolling of a ball bearing outer race has been simulated. Actual orbital forming process found in a bearing making industry is simulated by the presented approaches. The analysis result of the ring rolling process and the orbital forming process was compared with the experimental results and good agreement was observed.