Abstract
To easily improve the bending rigidity of the tool holder made of steel in the higher range of spindle speed, a spindle model was newly proposed having an alumina ceramics ring set up around the periphery of the spindle edge. The characteristics of the model were examined by numerical simulations with FEM comparing the results of a steel spindle model and an alumina ceramics one. In the proposed model, the bending rigidity of the tool holder, which was little affected by the spindle speed, was slightly smaller than that in the alumina ceramics model and was larger in the higher range of spindle speed than that in the steel model. The contact state on the shank of the tool holder in the proposed model resulted in the larger axial displacement, which was smaller than that in the steel model, in comparison with that in the alumina ceramics model.
