ОСОБЕННОСТИ СТАБИЛИЗАЦИИ КОЛЬЦЕВЫХ ЗАГОТОВОК

Abstract

Ring blanks are in demand in various branches of mechanical engineering in the production of large-sized bearings, turbine disks, special gears and other critical products. Besides high requirements to the ring blanks in terms of geometric dimensional accuracy, material structure and mechanical properties, in some cases the most important requirement is their production with absence of residual stresses and high stability of geometric shape. Specific features of ring rolling may lead to the occurrence of residual stresses, the magnitude of which is impossible to determine by the known methods of defect control. The paper analyzes the causes of shape error and residual stresses in the production of ring blanks in the process of ring rolling and heat treatment. The article also assesses the possibility of using different methods of shape stabilization and reduction of residual stresses in the manufacture of ring blanks for critical engineering products: expandable, thermal, thermomechanical, vibratory and ultrasonic treatment. For ring blanks designed for manufacturing critical parts, it is suggested to use shape stabilization and residual stresses reduction by means of cyclic loading after ring rolling and thermal treatment. The design scheme and force parameters of a device for stabilizing ring blanks on the basis of a double-acting lever-hinge mechanism are determined. The ring-rolling complex created at the Belarusian Automobile Plant will have potential opportunities to produce ring blanks for manufacturing of critical products in transport machine-building, aviation, space, defense and chemical industries of the Russian Federation. The results of the analysis of the methods for shape stabilization and reduction of residual stresses of ring blanks are planned to be used in the creation of this complex.