| Popis: |
Gerasimenko А. V., Markov O. E., Kosilov M. S., Hvashinskiy A. S., Ivanov P. H. Investigation of the rolling process of stepped cone rings // Material working by pressure. – 2019. – № 1 (48). – P. 71 – 76. A new method of rolling large-sized conical rings with a stepped profile has been investigated. The proposed method consists into deforming of the workpiece with a step in a stepped die. The paper proposed a methodology for conducting research using the finite element method. The technique is designed to determine the dependencies of the stress-strain state and the shaping of the workpiece in the process of rolling with a stepped dies. Variable parameters were the relative height of the protrusion of the stepped work-pieces, which varied in the range of 2.3 ... 2.4. On the basis of the finite element modeling, the following were established: the intensity distribution of the deformations in the forging section after rolling with a stepped die. The taper of forgings was determined, which is formed when rolling by this method. This is explained by the fact that when the ledge is compressed, there is a greater tangential deformation of the ring work-piece in the step zone than the protrusion zone due to the different height of the stepped work-piece. It was established that when rolling a work-piece with a difference of relative diameters of 0.43, when rolling, the protrusion and the ledge are deformed simultaneously. In this case, the diameter of the ledge increases more intensively than the protrusion due to which the forging acquires a conical shape. This is due to the different degrees of deformation that are formed in the protrusion and the ledge. Moreover, the degree of deformation in the ledge increases more intensely than in the ledge. The difference in degrees of deformation arises from the difference in the thickness of the walls of the protrusion and the ledge. As a result of research carried out in the work, it was found that the rolling of stepped conical billets is possible, this expands the technological capabilities of the process of rolling large-sized forgings. |
