PROBLEMS OF CREATION OF TWO-MOTOR DRIVE TUMBLING MILL.

Purpose. To compare the operability of exposed gearings of two-motor drives with those of one-motor drives and to analyze the ways of its reliable work. Methodology. The basis of calculation technique for the opened gearing deterioration is the mathematical model based on the result of synthesizing of experimental results and fundamental rules of the abrasion theory. It takes into account that velocity of teeth deterioration is depending on the parameters which characterize the influence of medium, physical and mechanical properties of constructional materials, geometrical and kinematical properties of gearings. Also it takes into account the deterioration velocity dependence on level of teeth deterioration. When the other parameters stay constant the main influence on opened gearing durability makes grinding velocity and load distribution along the contact line. Findings. The research shows that the ring gear and gear wheel teeth deterioration have the progressive nature if the hardness of gear wheel teeth is HB 300 and the hardness of the ring gear teeth is HB2 200. And for twomotor drives the longevity of ring gear makes 5-6 years. The radical method of solving the problem of opened gearings durability is rising of the teeth surface hardness. But this method results in teeth grinding speed lowering, and consequent nonuniformity of load distribution along contact line and, finally, lowering of teeth strength. Therefore, to ensure safe performance of the opened gearing the rising of production and assembling accuracy and upsizing of tooth module is required. Originality. The regularities of opened gearing deterioration have been determined. It is shown, that one of the general problems of the tumbling mill two-motor drive creation is the maintenance of opened gearing reliability. Practical value. The ways of improvement of the reliability of the tumbling mill two-motor drive opened gearing have been shown. [ABSTRACT FROM AUTHOR]