FIELD: machine building.
SUBSTANCE: method involves bending of sheet edges, forming, welding, expansion. Improvement of expansion operation efficiency by providing the conditions when minimisation of welded billet profile deviations from a circle shape occurs with the consideration of the impact of heat deformations associated with the welding operations, is achieved due to the fact that billet profile deviations from a circle are checked in at least three sections (at the ends and in the middle) after welding operation is finished, and when forming the next billet, the travel of a step moulding press punch is corrected accounting for the location, value and sign of the specified deviations. The press performance is corrected periodically after regular measurement of billet geometrical shape.
EFFECT: higher efficiency of the following expansion of the billets.
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