Study on the Self-excited Vibration in Cylindrical Plunge Grinding Process.

抄録

Chatter vibration may occur due to grinding, which may affect product quality and the life of tools and machine tools. There are two causes of these chatter vibrations: forced vibration and self-excited vibration. Above all, the mechanism of self-excited vibration is complicated, and it is necessary to suppress or solve them. In order to solve these self-excited vibration problems, research on cylindrical plunge grinding was conducted. In this study, focused on the rotational movement of the work-piece, which is a characteristic of cylindrical grinding. In addition, a new equation of motion was examined by considering the relationship between the tangential direction grinding force and the normal direction grinding force in cylindrical grinding as the friction phenomenon between the grinding wheel and the work-piece. Based on these equations of motion, eigenvalue analysis was performed using the numerical analysis software MATLAB. The object of analysis was cylindrical plunge grinding of a carbon steel round bar for machine structure having a diameter of 30 mm and a length of 175 mm. As a result, it was confirmed that the analytical model of this study occurs instability, which is considered to be self-excited vibration. This instability is affected by the distance between the contact point of the grinding wheel and the work-piece, which is determined by the grinding conditions, and the center of gravity of the work-piece. In addition, confirmed that increasing the support stiffness of the work-piece can suppress instability. So will report the results.