“Improving the quality of assembly technology by determining the size of the closing link under thermal stress”

Abstract

The article proposes a research 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 has 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. In turn, the efficiency of
dimensional chains calculation using the probabilistic method largely depends on the extent to
which the influence of random factors on the values of the constituent links and the closing link is
taken into account. Studies have confirmed that the calculation of the nominal value of the closing
link does not meet the requirements set out in the specifications when compared with the results
obtained when calculating without taking into account the influence of temperature gaps.
However, the practical assembly of the rotor of the SVPT-340-1000 LMZ feed pump, taking into
account the influence of temperature gaps, can lead to an improvement in the axial assembly
accuracy by 5% to 13% and a reduction in the gap between the ends of the rotor wheel and the
discharge disc by 6% to 10% without the need to use additional technological equipment.