MANUFACTURING METHOD OF AXISYMMETRICAL PARTS LIKE DISCS Russian patent published in 2015 - IPC B21K1/32 C22F1/18 B21H1/02 

FIELD: metallurgy.

SUBSTANCE: deformation of a peripheral part of a billet is performed by rolling with rolls at the superplasticity temperature in the deformation zone so that a sheet is formed. The central part of the billet is cooled down prior to rolling-off to the elastic deformation temperature. During the rolling-off process, the central part of the billet and the sheet subject to non-contact deformation is cooled down by action of a cooling medium on the central part. Cool-down of the sheet to its elastic non-contact deformation temperature is provided in a zone adjacent to the central part. Between the specified zone and the deformation zone, an intermediate zone is formed, in which temperature obtains an average value between elastic deformation temperature and superplasticity temperature and/or values close to the specified average value. In the rolling-off process, cooling medium pressure is increased with expansion of the cooled zone of the sheet. Intermediate zone temperature is maintained.

EFFECT: improving quality of manufactured parts and enlarging technological capabilities of their manufacturing method.

3 cl, 6 dwg, 7 ex