Experimental study of rolling processes of stepped conical rings
DOI:
https://doi.org/10.31498/2225-6733.42.2021.240592Keywords:
conical ring, stepped ring, rolling, stepped striker, taper, deformationAbstract
The work considers the technological process of rolling conical rings with a shoulder. The proposed method consists of rolling a hollow workpiece with a shoulder by a striker with a stepped profile. A methodology for pursuance an experimental research on lead and steel models has been developed. The developed technique made it possible to establish the dependences of the change in the shape of a stepped hollow workpiece under deformation by a stepped striker. In the study, the relative height of the protrusion of the stepped initial workpiece ranged from 2.2 to 2.5. Influence of the deformation degree on the taper and change in the diameters of the hollow workpiece has been established. This study has been carried out to obtain information on the quantitative assessment of the shape change of the workpiece in the process of its deformation. To develop a technological process for forging conical shells with a protrusion, the technologist must have recommendations on the taper formation on the forged piece, depending on the initial dimensions of the stepped hollow workpiece, as well as the degree of its deformation. On the basis of an experimental study, the regularities of the change in the taper and in the diameters of the holes from the degree of deformation have been established for various wall thicknesses when forging with the stepper striker. An increase of workpieces protrusion height results in an increase of the deformation degree, in an increase in the diameter of the workpiece in this part during rolling. This made it possible to define the magnitude of the shell taper, which is formed at forging by this method. Analysis of the macrostructural structure of a conical annular forging with a stepped profile made it possible to establish that when using the operation of rolling of the stepped workpiece with a stepped striker, the metal fibers replicate the contour of the part. This prevents them from being cut at machining. As a result of the research, it has been found out that the process of stepped conical workpieces rolling is possible and its introduction into production will widen the technological capabilities of the forging process of large-sized forged pieces
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