Optimal parameters of reference measurements of geometrical deviations for machinery parts supported in V-blocks

W artykule przedstawiono wyniki badań symulacyjnych, których efektem było wyznaczenie optymalnych parametrów układów pomiarowych zalecanych do pomiarów odchyłek geometrycznych zespołu powierzchni cylindrycznych dużych elementów maszyn ustalonych w pryzmach. Badaniami tymi objęto ustalenie układów pomiarowych najkorzystniejszych z punktu widzenia wyznaczania harmonicznych zarysu mierzonego w zakresie n=2÷15, najkorzystniejszych przy zastosowaniu dwóch czujników pomiarowych (pomiary n-parzystych i n-nieparzystych) oraz najkorzystniejszych do tzw. pomiarów przybliżonych.Verification measurement of compliance between geometrical realisation of produced machinery details and geometrical require-ments assumed by designer are performed using reference methods by fixing of those elements in V-blocks. The feature of measurement in V-block is such, that during measurement so based detail is displaced. The reason of displacement is constant points of contact between shapes of measured detail and V-block. In result measured roundness shape ΔF(φ) and measured roundness deviation ΔR(φ) differs less or more from real roundness shape ΔR(φ) and real roundness deviation ΔR. The measure of this distortion is so called distortion measurement coefficient kn expressed by formulae (1) or (2) (theory of harmonic analysis of roundness shape). Hitherto researches proved that values of kn coefficient for different methods performed in single V-block configuration are depending on parameters of measuring system (α and γ angles) [1, 2, 3, 4, 5]. The mentioned researches permitted to select optimal in sense of usefulness in detection of roundness deviation measuring systems. The author's efforts were focused on selection of most convenient method from point of view determination of harmonic components of measured shape in range n=2÷15, most convenient method in two sensor measurement (odd and even values of n) as well as for so called approximate measurements. The obtained results, meeting with assumed criteria were shown in tabular form (Table 2) and in graphical form (Graphs 1, a - m). Discussed in the paper simulative research results although not present in all cases of which can be considered as useful in measurements of geometrical deviation of machinery parts fixed in two V-blocks, from the other hand are the most representative group of measuring systems applied in practical measurements