TESTING MODELS OF ELASTIC DAMPING SHAFT-ACCUMULATOR OF CONTINUOUS STRIP MILLS DRIVE UNIT
Ackground. Continuous strip mills (CSM) have very high dynamism and accident rate. Rolls, drive spindles, bearings, chuck and support lugs collapse in operation. The high rigidity of the equipment mentioned and its low power consumption is the main reason for such a situation. In these conditions, parasitic loadings appear (for example, the horizontal force acting on the working rolls and rolling mill roll line). The main objective of the article is to show a possibility of creation of the active device for parasitic loadings reduction (damping shaft-accumulator with elastic polyurethane part). Materials and/or methods. For the achievement of the main objective, the following problems formulated and solved: necessary mechanical characteristics of polyurethane elastomeric materials for elastic part of damping shaft-accumulator defined; several versions of elastic spindle shaft of the drive unit of breaking-down roll mill stand developed; the equipment for glued models flexible shafts testing constructed. In additional tests, the scale dependences relating to reliability and rigidity of these shafts established; data on the fatigue endurance of shaft elastic element and its holding elements obtained. For these purposes, the contrivances for testing equipment and lathe machine designed. Also, testing equipment developed for check of the required tightness of an elastic element. Results. The possibility of design of the active device (damping shaft-accumulator with elastic polyurethane part) shown. Necessary mechanical characteristics of polyurethane elastomeric materials for an elastic part in question defined. For non-standard tests of these elastic parts, necessary testing equipment designed. Versions of designs of an elastic damping shaft-accumulator developed. Conclusion. The results of performed tests confirmed a possibility to create an effective operating damping elastic shaft-accumulator. Based on the research data, two versions of flexible shaft design - with glue and mechanical connection of an elastic element with half-coupling - are offered.