Markevich I. Development of the method for calculating parameters of the process of the cold die roller rolling with regulation of the link length in order to increase the good-to-bad yield of especially thin-wall tubes

The complex mathematical apparatus and corresponding computerized realization had been composed which allows to carry out the calculation analysis of parameters of the CTRR process and the influence of adjusting lever system on the value of axial forces. The new laws for calculation of the rolling radius had been obtained taking into account the non-uniformity of distribution of the normal contact stresses along the perimeter of the roll pass that takes into account the real CTRR process with more accuracy. With purpose to obtain conditions for coincidence of adjusting and natural rolling radii along the length of the working cone the CTRR mill with regulation of the bigger link arm had been developed and the declarative patent of Ukraine №4081 from 27.04.2009 had been issued. Additional experimental data had been obtained concerning values of axial forces in the CTRR process at the changing values of the bigger link arm in regard to smaller arm. The programs "CTRR - parameters" and "CTRR - axial" had been passed to the Open Joint-Stock Company "Centravis production Ukraine" for applying to the analysis of processes and designing of the mill tool. Results of the work in the form of computer programs are used in educational process in NMetAU.