Other

Chelyabinsky Politekhnichesky Institut

Vladimir N Vydrin

Leonid A Barkov

Valery V Pastukhov

Vladimir G Dukmasov

Garifulla Davlyatshin

Nikolai N Sergeev

Vladimir G Dremin

Evgeny N Berezin

Oleg I Tischenko

Sergei I Dolgov

Pulat S Maxudov

Anatoly P Pellenen

Leonid M Ageev

Sergei L Kuznetsov

Vladimir S Sysoev

Efim M Rabinovich

Vladimir S Mebel

Anatoly A Shegai

Valery K Ushakov

Vyacheslav N Chernyshev

Grigory I Koval

Alexandr V Krupin

Jury L Zarapin

Eduard E Osipov

Gennady Z Serebrennikov

Vladimir A Matveev

Sergei F Burkhanov

Sergei A Mymrin

Pulatzhan S Maxudov

Garifulla Davlyatshik

Oleg Ivanovich Tischenko

Pavel M Sychev

Erik V Pravednikov

Dmitry S Novikov

The present invention relates to methods of rolling metal articles and can be used to advantage in rolling sheet steel. This method envisages the rotation of drive and driven work rolls in opposite directions at a higher and a lower peripheral speeds, respectively. The chosen ratio between the peripheral speeds of the work rolls is less than the elongation of the article so that thereby the specified unit tension applied to the article at the exit section thereof is provided for with reference to the ultimate strength of the metal emerging from the rolls. This is conducive to increasing the maximum elongation of the article and reducing the roll force by a considerable amount with the constriction of the article in breadth at the same time.

Method of rolling metal articles

The mill includes a stand on which at least three work rolls are mounted. At least two of the work rolls are secured in the roll housing chocks and provided with a drive means. The rolls rotate in opposite directions at different peripheral speeds increasing along the passline. At least one work roll is provided with a screwdown. The mill according to the invention for rolling metal strip is characterized by the axis of the middle work roll being offset with respect to the plane passing through the axes of the extreme work rolls towards the point where the metal strip being worked enters the first pair of work rolls, formed with the middle and the first extreme work rolls, as viewed in the direction of the passline, and towards the point of the metal strip emergence from the second pair of work rolls, formed with the middle work roll and the second extreme work roll. The rolling method according to the invention is characterized by the length of the deformation zones formed in the course of rolling between the first extreme work roll, as viewed in the direction of the passline, and the middle work roll and between the second extreme work roll, along the passline, and said middle work roll being less than half the circumference of said middle work roll.

Mill for rolling metal strips

A vacuum roll mill stand comprises a housing closed at opposite sides with covers and having its interior brought in communication with a vacuum pumping means to thereby form a chamber adapted to accommodate chocks carrying workrolls geared through the intermediary of spindles to a drive. The chocks together with the workrolls are secured on one of the housing covers thereby forming a frame, the housing being annular in shape and arranged so as to have its geometrical axis coincident with the axis of rolling; the housing also being fitted with through openings adapted to receive the spindles together with vacuum seals.

Vacuum roll mill stand

Method and mill for rolling metal strip

Proposed herein is a method of controlling the thickness of strip stock being rolled between rolls mounted in the roll stand of a mill. An adjusting force is developed to move the supports of one of the rolls, this force exceeding the rolling force and being directed oppositely thereto. Another force prevents the supports of the rolls from moving towards each other and balances the difference between the adjusting force and the rolling force. The factor of proportionality between the movement of the roll supports and the balancing force is in a definite predetermined ratio with the mill stand stiffness factor. The adjusting force is changed in the course of strip stock deformation to compensate for the roll gap variation in proportion to the rolling force according to the following formula:

Method of controlling the thickness of strip stock being rolled

A mill stand has a roll housing which mounts chocks provided with cantilevered axles carrying workrolls with at least one axle being connected with a spindle geared to a drive. The spindle of at least one workroll is positioned in direct proximity with the axle which carries this workroll, on the side of its free end. Such mill stand construction makes it possible to effect rolling of difficult-to-form metals and alloys.

Mill stand

A continuous mill has a plurality of passes arranged in series and formed by work rolls which are mounted on shafts secured to common chocks accommodated in housings. The chocks provided in the mill are equal in number to the workrolls forming a pass. Each of the chocks has two sides converging at an angle, and the shafts carrying the workrolls are cantilevered to each of said sides. The shafts secured to one side are offset relative to the shafts secured to another side so that the adjacent passes are spaced in closest possible proximity with one another; the angle between the sides of each chocks being equal to the divergence angle of the adjacent passes.

Continuous mill

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 device proposed herein incorporates the following components located on both sides of the roll mill stand: hydraulic dynamometers for absorbing the rolling force; hydraulic cylinders for creating and exerting the adjusting force; and valves for oil pressure control in the hydraulic cylinder interior. The hydraulic dynamometers are situated between the supports of one of the rolls and the roll mill stand housing and the hydraulic cylinders are interposed between the supports of the other roll and the roll mill stand housing. The interior spaces of said cylinder and the dynamometer communicate with pumping units that deliver oil thereto so as to build up a pressure in the spaces which is in excess of the rolling force. The valves regulate the pressure effective in the hydraulic cylinder interior in direct proportion to the rolling force and the deforming force of the elastic members of the device.

Device for controlling the thickness of strip stock being rolled

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 roll mill stand has a supporting frame which mounts two housings with at least three work rolls being arranged therebetween, the geometric center lines of the rolls being located in a single plane and set one with respect to another to form a pass. The work rolls are mounted each in a respective shell, the latter being hinged upon one of the housings by a pivot secured in the housing parallel to the work roll and connected to the other housing by a screw-down mechanism intended to adjust the radial gap between the work rolls. At least one of the shells is supported by the respective pivot connecting the shell to the housing, the gap between the work rolls being adjustable transversally with respect to the axis of rolling.

Roll mill stand

A roll mill stand comprises a housing which mounts chocks having secured therein journals carrying work rolls forming a pass, at least one of said work rolls being coupled by means of a splined joint with one end of a spindle, the other end of said spindle being connected by a splined joint to a pinion geared to a drive means. The roll mill stand is provided with an arrangement for axial displacement of the spindle, comprising a motion screw mounted coaxially with the spindle and coupled with its other end, the motion screw carrying a nut with a disk affixed to the end face thereof, the nut being mounted on a hub coupled with the spindle shaft for rotation with respect to said nut, the roll mill stand being additionally provided with a braking mechanism placed on the stationary part of the roll mill stand and cooperating with the disk of said nut, as said nut is being slowed down to disengage the spindle from the work roll.

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.

Method and mill for rolling metal billets

A device for automatic adjustment of a roll gap in a mill stand, comprises hollow hydraulic load cells for absorbing or taking up a roll force. Said hydraulic load cells are mounted under chocks of at least one of the rolls and are not affected by the action of hydraulic cylinders adapted to develop a stand prestressing force. The hydraulic cylinders are of the two-chamber type. One of the chambers of each hydraulic cylinder communicates directly with that of the hydraulic load cell, while the other chamber communicates directly with a constant-pressure fluid source.

Device for automatic adjustment of roll gap in mill stand

The device for automatic adjustment of the roll gap consists of two similar operable parts arranged on each side of a mill stand, each part comprising a two-chamber hydraulic cylinder for prestressing the mill stand. The cylinder is fitted with two rods, one of which interacts with a bottom cross bar of the housing, the other one accommodating a load cell for absorbing a rolling force and being mounted so as not to be effected by the mill stand stress. One chamber of the two-chamber hydraulic cylinder communicates with a constant pressure fluid source and the other chamber communicates with a chamber of the load cell. The two-chamber hydraulic cylinder is fitted with a regulated valve, which has a throttle chamber in communication with a second chamber of the hydraulic cylinder and with an individual variable-pressure fluid source, and a control chamber combined with the chamber of the load cell.

Growing community of inventors

Chelyabinsk, undefined

Vladimir N Vydrin