РОЗРАХУНОК ОСНОВНИХ ПАРАМЕТРІВ РАДІАЛЬНО-РОТАЦІЙНОГО ПРОФІЛЮВАННЯ МЕТАЛІВ ПРИ ВИГОТОВЛЕННІ КОЛІСНИХ ОБОДІВ РІЗНИХ ТИПІВ І ТОВЩИНИ

Abstract

The work is devoted to the establishment of design dependencies to determine the main optimal parameters of radial-rotary profiling, which provide quality indicators of manufactured products. The processes of rotary shaping of metals by pressure are becoming more and more widespread, since it can effectively solve the main problems arising in machine-building and metal-working industries. The economic efficiency of radial-rotary profiling can be ensured by development of a technological scheme based on the deformation process main parameter optimal values. Localization of the deformation zone significantly reduces the deformation forces, which makes it possible to process high-strength and low-plastic materials and to obtain products of various configurations on equipment with a relatively low power, for example, wheel rims of various transport vehicles (cars, light aircraft, etc.). The results of analytical studies of the regularities describing the technological scheme of radial-rotary profiling are presented. For this, the following parameters have been determined: maximum feed of the lower and upper rollers, conditional groove depth for a part with tapered caps; geometric dimensions of the imprints of the cap contact areas with the lower and upper rollers. It was found that when the profile depth changes, the feed rates of the upper and lower rollers change insignificantly, so the profile depth can be taken the same in both cases. It has been established that the concentrated nature of the specific pressure that the workpiece perceives does not reduce the tool safety margin. The rollers are made of steel 9ХС, withstand pressure 1600 ... 1800 MPa. During the workpiece shaping the values of the characteristics change. Therefore, it is recommended to determine the feed critical value for several values of the profile depth and take the smallest value. The calculated feed values have been confirmed by experimental studies. It was determined that when profiling without lubrication, the number of shell revolutions per unit time is 20% less than the number of shaft revolutions.