FEATURES OF OPTIMIZATION OF PRESSING MODES OF POWDER MATERIALS FOR PARTS OF SHIP MECHANISMS

The article considers the features of optimization of modes of pressing powder materials for ship machinery parts using mathematical models. It is established that in order to obtain an adequate mathematical model, it is necessary to more accurately specify the rheological properties of powder materials, which largely determine the kinetics of compaction during HIP. It is indicated that the solution of this problem by the finite element method for products of complex configuration with nonlinearity of the used relations and non-stationary nature of deformation requires the use of iterative procedures in the presence of a large number of finite elements at each time step. It is determined that the upper-level model does not allow solving the problems of optimization and optimal control of the HIP pressing process. To overcome these difficulties, it is possible to use the lower level of modeling, including zero-dimensional and one-dimensional HIP models. A system of technological modes of hot isostatic pressing of powder materials is proposed, which provides for discrete and continuous mathematical modeling of HIP. Discrete and continuous representation of the HIP technological process design system structurally includes the interaction of mathematical models of the upper and lower levels. The use of lower-level models with the use of an optimization apparatus allows us to seriously narrow the search area for technological solutions, thereby obtaining the most reliable and accelerated information on the modes of pressing powder materials for parts of ship mechanisms.