FIELD: metallurgy.
SUBSTANCE: rotational extraction of hollow billets by deforming rollers is made with different profile angles, installed with different gaps with a mandrel. Rollers with different front and rear angles are used. In this case, the rollers are installed with a successive change of angles from the roller with a smaller front and large rear profile angle to each subsequent roller with larger front and smaller rear profile angles and with a consequent reduction in gaps relative to the mandrel.
EFFECT: high accuracy of dimensions and quality of the processed membranes surface.
8 cl, 3 dwg
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