On the new type variable stiffness surface grinding machine

Abstract This study deals with a new type surface grinding machine which can give various grinding performances by changing its static stiffness and damping properties freely. As the first step, a prototype of such a variable stiffness surface grinding machine is manufactured and its feasibility is investigated by conducting the simulation grinding using this machine. The machine has a double column structure consisting of a movable column and a fixed additional column. In addition, it has several coiled springs and a damping element between the two column so as to change its static stiffness and damping properties. The static stiffness can be changed by tightening or loosening the clamping force of the coiled spring attachments. The damping properties can be changed by adjusting the force acting upon a friction plate. The results obtained are summarized as follows: (1) The prototype of a variable stiffness surface grinding machine can change its static stiffness and damping property freely. Therefore, a surface grinding machine having various grinding performances may be produced according to this method. (2) The results of the simulation grinding show that the static stiffness and the damping property of the surface grinding machine will be principal factors affecting grinding performances such as machine vibrations, surface finish, grinding burn, and grindability and life of grinding wheels.