FEATURES OF FUNCTIONING OF THE CORE MECHANISM OF DEDUCTION OF AUTOMATIC MANDREL MILL, TAKING INTO ACCOUNT THE VARIABILITY OF SYSTEM MASS

Abstract

The dynamics of a system sleeve (pipe) – mandrel – rod of an automatic mill of the pipe-rolling unit was considered. The differential equation of the movement of a mandrel rod of an automatic mill was worked out taking into account the mass of mechanical system changing in time. The dynamic processes in mechanical system sleeve (pipe) – mandrel – rod is presented by coeffi cient of movement dynamism of a mandrel with a core. The features of functioning of rod system of the deduction mechanism of an automatic mill mandrel were established and parameters of dynamism of mechanical system were determined according to the change in time of mass of the rolled pipe. It is shown that at the instant appendix from the center of deformation of constant force in elastic system of mechanisms of the output part possessing a variable in time weight, the maximum dynamism coefficient isn’t equal to two. Its values monotonously change and increase during the fl uctuations of system with the increasing weight. By modeling of dynamic processes in system sleeve (pipe) – mandrel – rod taking into account the change in time of mechanical system mass, the need of stabilization of dynamism of a mandrel with a core to the level of admissible sizes was revealed for the equipment of the output part of an automatic mill.