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Vladimir G Dremin

Vladimir N Vydrin

Evgeny N Berezin

Oleg I Tischenko

Grigory I Koval

Gennady Z Serebrennikov

A roll-forging mill comprises a roll stand with working tools adapted to perform oscillating movement by means of bars articulated on a support stand. The support stand is mounted for movement on stationary guides along the passline and is actuated by power cylinders operable to coordinate the traveling speed of the continuous metal strand with that of the roll stand at the moment of metal reduction, the actuator enabling the roll stand reciprocation being mounted on the support stand.

Roll-forging mill

The present invention relates to plastic working of metals and the reducing of a workpiece along its axis by a pair of shaped rolls with formation in the workpiece of a transitional length whose cross section gradually changes from a starting one to several cross sections of finished bars interconnected by webs. The reduction of the workpiece is alternated with its axial displacement through one feed step, whereas at the end of a transitional length adjacent bars are displaced one with respect to another in opposite directions perpendicularly to webs so as to separate the bars. Mill rolls used with the method have several grooves of a variable cross section which form passes for rolling bars. The profile of each groove in transversal (with respect to mill roll axis of rotation) cross section is formed of two mutually conjugated arcs successively coming into contact with the workpiece. The grooves have an arc for reducing the workpiece and an arc for dividing bars one from another. The centers of curvature of the arcs are located at different eccentricities with respect to the mill roll axis of rotation, with the directions of eccentricity alternating in adjacent grooves.

Method and mill rolls for metal bar rolling

A method of rolling metal billets in a single pass comprises the steps of reducing a billet by workrolls and alternating each reduction cycle of the billet being worked with axial feed thereof through a step of rolling. As the billet is worked by the workrolls a transitional section is formed thereon as a deformation cone having a length along the axis of the billet substantially greater than the corresponding length of the deformation zone induced in the billet by each workroll at each given moment. The mill for carrying out this method comprises a frame having guides running in parallel with the axis of the billet being worked and mounting a roll housing geared to the mill drive to reciprocate the roll housing inside said guides in the course of rolling. The roll housing accommodates at least four variable-radius workrolls having their geometrical axes of rotation extended in one plane perpendicular to the axis of the billet being worked, the rotation of the workrolls about said axes being effected in the course of rolling positively and in synchronism with the reciprocations of the housing. The mill is also provided with a feeder for axially feeding the billet to the workrolls, mounted on the frame on the side of the billet entry to the workrolls and geared to the mill drive.

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Chelyabinsk, undefined

Vladimir G Dremin