REDUCING THE IMPACT OF DYNAMIC LOADS ON THE SURFACE QUALITY OF MILLED THIN-WALLED BUSHINGS

Abstract

It is shown that even under conditions of quiet cutting, self-oscillations arise when turning surfaces. A review of domestic and foreign literature showing the reasons for the formation of oscillations during cutting is given. The complexity of the analytical description of the physical processes in the cutting zone, forcing researchers to resort to mathematical modeling, is noted. It is noted that a particular difficulty is the study and description of the milling process, due to the presence of variables on the module and direction of cutting forces, leading to additional forced vibrations of the technological system. It is shown that in order to reduce vibrations in the system, it is possible to reduce cutting conditions and, accordingly, productivity, increase rigidity and damping ability of the system. When installing thin-walled v-lok on multi-purpose machines, a special role is given to clamping devices. Devices with metal expanding elements act on a limited portion of the length of the cylindrical suface, and therefore cannot increase the vibration resistance over the entire surface. The design of the mandrel with an elastic-elastic sleeve located between the body of the workpiece and the main base mandrel has been developed. Through axial compression, the elastic-elastic sleeve increases its thickness and increases the rigidity and damping capacity of the technological system, which ultimately leads to a decrease in the roughness of the treated surface by 1.5 times.