Rybak O. Mathematical modelling, analysis and optimization in CAD of technological process of grinding plasma coatings

The presented thesis is focused on the process of grinding plasma coatings CAD development. In order to prevent grinding defects generation and propagation, mathematical model of the temperature field and the stress-strain state of the workpiece with plasma coatings in the process of grinding is developed. Due to the special features of plasma coatings, structural heterogeneities generated while coatings are being sprayed, as well as coating adhesion are also considered. Taking into account special characteristics of the considered technological process, modification of the classical genetic algorithm for optimization of plasma coatings grinding is presented in this thesis. The developed algorithm is based on the parallel evolutionary search and combined method of selection for chromosomes with different values of the fitness function. On the basis of the presented mathematical model of the temperature thermal field and the stress-strain state of the surface layer during its grinding as well as the modified genetic algorithm for optimal technological parameters search, CAD system of the plasma coatings grinding process has been developed. Experimental testings of the presented «PLASMOSHLIF» CAD system have been successful, so it was accepted to implementation in industry.