FIELD: production of seamless hot rolled tubes of forged or continuously cast billets, electroslag refining ingots.
SUBSTANCE: method comprises steps of heating billets or ingots up to yielding temperature; piercing them to hollow sleeves in skew rolling mills; putting sleeve onto mandrel provided with ring; deforming it while feeding at preset speed to deformation zone; rolling out pilger head on free mandrel at rolling away sleeve-tube by means of rolls and simultaneously extracting mandrel by means of feed device; performing last deformation of pilger head before extraction of mandrel from incompletely rolled sleeve-tube; contracting sleeve-tube by means of mandrel ring; applying effort for extracting mandrel by means of feed device at time moment of after-rolling sleeve and rolling out pilger head; extracting mandrel from sleeve-tube while applying effort for extracting mandrel by means of feed device after guiding and rolling tube by length (1.5 - 2.0)Lra where Lra - rolling away path of feed device.
EFFECT: complete after-rolling of pilger heads on free mandrel, lowered factor of metal consumption, enhanced efficiency of aggregate.
4 cl
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