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J. Kiełbiński

Procedures for the calculation of distributive gears in twin-screw extruders

Polimery 1988, No 7-8, 294

DOI: dx.doi.org/10.14314/polimery.1988.294


The effect of the specific exploitation conditions of a distributive gear in twin-screw extruder, namely of low number of revolutions, small spacing of screw axes, very high and variable load, on the determination of its designing reatures has beeen deliberated. An essential problem is the establishment of a computational load taking into consideration the equivalent number of cycles, dynamic loads and variations of load due to nonuniformity of the work of the system of screws. In the calculations of toothed gears, the nonuniformity of load distribution along the tooth line of action must be taken into account, this nonuniformity being due to the deformations of gear elements. The correction of tooth profile and their modification contributes to an increase in the fa ctor of safety against break and surface loads. Both the type of material used fo r the construction of toothed gears and their heat treatment and nitriding have an essentail influence on gear dimensions. To illustrate the effe ct of the above mentioned parameters, the results of calculations of a distributive gear for the 2T14 extruder have been presented. The possibility of a considerable increase in bearing capacity of the gear (or of the reduction of module pitch) by a correction in gear teeth has beeen demonstrated. An analysis of the distributive gear design of the 2T14 extruder reveals that a particular attention ought to be paid to a reduction in the nonuniformity in the distribution of loading along the tooth line by means of an appropriate location of the toothed gears in respect to shaft supports and necks.

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