Improvement of the Assembly Technology Quality by Determining the Closing Link Size Under Thermal Stress

The study aims to improve the quality of the thermal assembly technology of engineering elements by introducing a methodology for determining the size of the closing link in the calculation of assembly dimensional chains, taking into account the influence of temperature gaps. The presented analysis of the technological preparation of production revealed the need to include the calculation of dimensional chains as one of the elements of dimensional analysis, which is determined by a set of calculation and analytical procedures carried out during the development and analysis of structures and technological processes. The effectiveness of dimensional chain calculation using the probabilistic method largely depends on the extent to which the influence of random factors on the values of the component links and the closing link is considered. Studies have confirmed that the calculation of the nominal value of the closing link does not meet the requirements set forth when compared with the results obtained during the calculation without considering the influence of temperature gaps. However, the practical assembly of the feed pump rotor, taking into account the influence of temperature gaps, can lead to an improvement in the axial assembly accuracy by 5% to 13% and a decrease in the gap between the ends of the rotor wheel and the discharge disk by 6% to 10% without the need to use additional technological equipment.