DETERMINATION OF DISSIPATIVE PARAMETERS OF CRANK PRESS

The paper considers the determination of the dissipation coefficients of the crank press's assemblies (units). Slide-crank mechanism of the press performs stamping of various parts. In such a case, there are significant dynamic loads in the assemblies and connections of the press. Work features of the crank press are connected with shock cyclic loads. Dynamic research of crank presses, at present, is a critical task. Dynamic model of the crank press is represented as an oscillatory system with many degrees of freedom. The dynamic model of the crank press consists of lumped masses connected by elastic-dissipative elements. To calculate the dynamic model of the crank press, it is required to determine dissipation coefficients of individual sections of the drive shaft. Determination of the dissipation coefficients is of great complexity. In the case of vibrations of elastic systems, energy is dissipated in machine parts and mechanical energy is transferred into thermal. Losses of mechanical energy are caused by forces of inelastic resistance, called dissipative forces. The amplitudes of the resonance oscillations, the conditions for the excitation of parametric oscillations and self-oscillations depend on the dissipation coefficients. The determination of dissipative coefficients is based on available information on the dissipation coefficients of individual elastic dissipative elements of the system. An example is given for determining the coefficients of dissipation of the crank press. The dynamic model of the crank press was compiled on the program complex SimulationX. The obtained results show that the dynamics of oscillations of the drive shaft of the crank press changes significantly after adjustment of the coefficients of dissipation.