COMPLETING METHOD OF MULTI-SUPPORT ASSEMBLY OF CRANKSHAFT

FIELD: machine building.SUBSTANCE: method involves measurement of diameters of primary supports of case, main journals of crankshaft, their misalignment values, thickness of upper and lower inserts, sorting of parts as per dimensional groups, selection of sets of parts in a batch by simulating the assembly considering all the measurement parameters and calculation of total completing error. At that, inserts are chosen as to their thickness by calculating "working" gaps in the zone of their maximum approximation under load, considering the measurement parameters of each primary support and similar main journal. Parts are sorted, and at the same time, accuracy of radial gap is calculated by comparing it to allowable limit values of radial gaps and by choosing the measured dimensions of contact surface of completing parts, which are the closest as to the value. Simulation is performed by using geometrical plane model of mounting assembly and performing mathematical simulation and computer-aided selection of the required combination of sizes of thicknesses of upper and lower inserts of secondary journals. Then, the required thicknesses of inserts are chosen by deducting from "working gap" value the corresponding values of limit values of radial gaps in each similar pair of main bearing-main journal of crankshaft, by using the data of actual measured sizes of diameters of holes of primary support of diesel engine casing, main journals of crankshaft, thicknesses of upper and lower inserts of main sliding bearings using combinatory relationship of design radial gap.EFFECT: improving the accuracy of radial gaps and efficiency of assembly process due to automation of completing process of multi-support bearing assembly.6 dwg, 3 tbl Изобретение относится к технологии двигателестроения, в частности к технологии селективной сборки коренных подшипников двигателей внутреннего сгорания. Способ включает измерение диаметров коренных опор картера, коренных шеек коленчатого вала, величин их несоосностей, толщины верхних и нижних вкладышей, сортировку деталей но размерным группам, подбор комплектов деталей в партии путем моделирования сборки с учетом всех параметров измерений и расчета суммарной погрешности комплектования. При этом осуществляют подбор вкладышей по их толщине, рассчитывая «рабочие» зазоры в зоне их наибольшего сближения под нагрузкой, с учетом параметров измерений каждой коренной опоры и одноименной коренной шейки. Сортируют детали, одновременно рассчитывая то