RU2610184C1 - Step-by-step rolling mill for flat long billets - Google Patents

Abstract

FIELD: metal processing.

SUBSTANCE: mill relates to metal forming and can be used for rolling of long flat billets of bands and strips, preferably, of difficult-to-deform steels and alloys. Mill includes device for consecutive indexing of flat long workpiece and rolls arranged in mill with smooth body, one of which is installed with possibility of back-and-forth movement and reversing rotation for deformation of a flat blank straight stroke and reverse run after stepwise movement of billet. Possibility to increase degree of reduction is ensured by that top roll axis is located in vertical plane, that is perpendicular to vertical plane, where longitudinal axis of lower roller, upper roller is equipped with reversing drive and is installed with possibility of back-and-forth movement along lower roller for deformation of flat billet in transverse direction by forward stroke and reverse run after stepwise movement of billet.

EFFECT: rolling of long flat billets of bands and strips, primarily, of difficult-to-deform steels and alloys.

6 cl, 7 dwg

Description

The inventive object relates to the processing of metals by pressure and can be used for rolling long flat billets such as tapes and strips, mainly from hard to deform steels and alloys.

The closest set of features to the claimed object is selected as a prototype mill stepping rolling tapes, which is given in the description of the invention to the patent of the Russian Federation No. 2521764 on the method of step rolling, published 10.07.2014. The known mill includes a device for stepwise moving a flat workpiece and rolls installed in the bed with a smooth barrel, one of which is mounted with the possibility of reciprocating movement and reverse rotation for deformation of the flat workpiece forward and reverse after stepwise movement of the flat workpiece. The workpiece is deformed by forward and reverse motion with the reciprocating movement of the roll axes and the free movement of the workpiece along the rolling axis in the direction opposite to the direction of movement of the roll axes during workpiece deformation when the workpiece is forced to move towards the finished profile during the formation of the gap between the workpiece and the work surface rolls. The axial forces in the workpiece during its reverse deformation are reduced due to the fact that the forced movement of the workpiece before the reverse stroke is additionally carried out by the amount of free movement of the workpiece, while the free movement of the workpiece does not exceed the calculated value.

The claimed object and the prototype match the following essential features. Both stepper rolling mills contain a device for stepwise moving a flat workpiece and rolls with a smooth barrel installed in the frame, one of which is mounted with the possibility of reciprocating movement and reverse rotation for deformation of the flat workpiece forward and backward after its stepwise movement.

When using the claimed object is expected to achieve a technical result, which consists in increasing the degree of deformation of a flat lengthy workpiece, mainly from hard to deform steels and alloys.

Analysis of the technical properties of the prototype, due to its features, shows that the following reasons hinder the receipt of the expected technical result when using the prototype. Hardly deformable steels and alloys with deformations of more than 50-55% are strongly “blown off” and their further deformation in the longitudinal and especially in the transverse direction is impossible due to the very high loads on the rolls and the strength characteristics of the rolling stands. The deformation zone in the rolling rolls is localized only in the area of metal contact with the upper and lower rolls. When rolling a flat long workpiece, a deformation zone is formed along the entire width of the rolls and for difficultly deformed alloys it is not possible to provide a high degree of deformation of a flat long workpiece due to the large forces on the rolls and large rolling moments. And to deform flat long workpieces in the transverse direction in the prototype is generally impossible.

The claimed object is based on the task of creating such a mill for the step rolling of a flat long billet, in which an improvement by introducing new elements would make it possible to achieve a technical result when using the inventive object, which would increase the degree of deformation of a flat long billet made of difficultly deformed steels and alloys.

The essence of the proposed facility is as follows. The mill for step rolling of flat long billets includes a device for stepwise moving a flat long billets and rolls with a smooth barrel installed in the frame, one of which is installed with the possibility of reciprocating movement and reverse rotation for deformation of a flat long billets with forward stroke and reverse after a stepwise movement of the workpiece .

A distinctive feature of the claimed object is the following. The longitudinal axis of the upper roll is located in a vertical plane that is perpendicular to the vertical plane in which the longitudinal axis of the lower roll is located. The upper roll is equipped with a reversible drive and is mounted with the possibility of reciprocating movement along the lower roll to deform the flat long workpiece in the transverse direction with a forward stroke and a reverse stroke after a stepwise movement of the workpiece.

In special cases of use, the claimed object is characterized in that:

- the lower roll is equipped with a step-by-step drive, which is synchronized with a step-by-step drive of a flat long workpiece;

- a device for the stepwise movement of a flat long workpiece is made on the basis of a rolling stand, in which rolls with a smooth barrel are installed for additional compression of the workpiece in thickness during its stepwise movement;

- the lower roll is mounted to rotate relative to the longitudinal axis, which is parallel to the longitudinal axis of this lower roll to control the degree of compression of the workpiece;

- the value of the radius of the lower roll is 0.5-2.0 the radius of the upper roll;

- the lower roll is equipped with a rotation drive at a predetermined angle around its longitudinal axis and is made with a variable radius, the value of which varies from 0.5 to 2.0 of the radius of the upper roll.

When using the inventive object, it is expected to achieve a technical result, which consists in increasing the degree of deformation of a flat lengthy workpiece of difficultly deformed steels and alloys.

Between the totality of the essential features of the claimed object and the achieved technical result, there is the following causal relationship. Arrangement of the longitudinal axis of the upper roll in a vertical plane that is perpendicular to the vertical plane in which the longitudinal axis of the lower roll is located, supplying the upper roll with a reversible drive and setting it with the possibility of reciprocating movement along the lower roll to deform the flat long workpiece in the transverse direction in the forward direction and in reverse, after stepwise movement of the workpiece, it ensures deformation of the workpiece in the transverse direction at each stroke of the upper roll SRI with metal over a lengthy flat broadening preform transversely and not longitudinally, as in the prior art. Moreover, in the axial section of the rolls, deformation is currently not carried out over the entire width of the rolls, as in the prototype, but only locally on a part of the width of the flat workpiece. The flat long workpiece is periodically moved forward by a step equal to 0.2-1 the size of the deformation zone, and then the direction of rotation and the direction of movement of the upper roll are switched in the opposite direction and the flat long workpiece is deformed in the opposite direction. The reciprocating movement of the upper roll across the flat lengthy workpiece with an adjustable stepwise feed forward provides the deformation of the flat workpiece in the transverse direction with the flow of metal in broadening. Local deformation of a flat long billet along its width allows working hard to be deformed steels and alloys in the transverse direction at very high compression ratios, since the rolls do not experience heavy loads.

Depending on the amount of compression and the pitch of the flat long workpiece, periodic small waves are formed on its lower surface from the side of the lower roll, located across the flat workpiece. These waves during subsequent rolling of a flat long workpiece in smooth rolls are smoothed over the entire length of the workpiece. The maximum wave height is formed at a step equal to the length of the deformation zone. The minimum wave height is formed at a step equal to 0.2 of the length of the deformation zone. By deforming a flat lengthy workpiece from difficultly deformed steels and alloys in the transverse and longitudinal direction, isotropy of the properties of a flat long workpiece in two directions is ensured.

Providing the lower roll with a step-by-step drive, which is synchronized with the step-by-step drive of a flat long workpiece, allows local deformation of the workpiece at a new section of the lower roll at each stroke of the upper roll, which prevents an increase in the radius of curvature of the working surface of the lower roll as a result of its premature wear and increases uniformity of deformation of the workpiece along its length.

The implementation of the device for the stepwise movement of a flat long workpiece on the basis of the rolling stand, in which the rolls are installed with a smooth barrel for additional compression of the flat long workpiece in thickness during its step-by-step movement, provides for step-by-step movement of the workpiece by the stand rolls and simultaneous compression of the workpiece in thickness to remove waves generated with its local deformation in the rolls of the previous stand.

The installation of the lower roll with the possibility of adjustable rotation relative to the longitudinal axis, which is parallel to the longitudinal axis of this lower roll, allows you to change the distance between the working surface of the lower roll and the working surface of the upper roll, change the length of the deformation zone and allows you to adjust the degree of compression of a long flat workpiece in one pass of the upper roll .

Performing a set of lower rolls with different radii, the value of which varies from 0.5 to 2.0 relative to the radius of the upper roll, allows you to choose the degree of local deformation on a particular lower roll with a specific curvature of the working surface, taking into account the strength properties of a particular difficultly deformed material. So you can adjust the length of the deformation zone and thereby adjust the depth of the material.

The range of numerical values of the ratio of the radii of the lower and upper rolls is determined experimentally.

The supply of the lower roll with a rotation drive at a given angle around its longitudinal axis and its execution with a variable radius of the working surface, the value of which varies from 0.5 to 2.0 of the radius of the upper roll, allows you to select a section with a specific curvature of the working surface on one lower roll and choose the degree of local deformation, taking into account the strength properties of a particular difficultly deformed material. So you can adjust the length of the deformation zone and thereby adjust the depth of the material.

The range of numerical values of the ratio of the values of the radii of the sections of the lower roll and the radius of the upper roll is determined experimentally.

The essence of the claimed object is illustrated by illustrative materials, which depict:

in FIG. 1 is a front view of the mill stepping rolling of long lengthy blanks;

in FIG. 2 is a view along arrow “C” in FIG. one;

in FIG. 3 is a side view of the mill stepping rolling of a long lengthy workpiece when performing the device for the stepwise movement of the flat workpiece on the basis of the rolling mill;

in FIG. 4 is a top view of the upper roll and lower roll of the mill when rolling a flat lengthy workpiece;

in FIG. 5 is a side view of the upper roll and the lower roll, which is rotated relative to the longitudinal axis, which is parallel to the longitudinal axis of the lower roll, in a position corresponding to the minimum deformation;

in FIG. 6 is a side view of the upper roll and lower roll, which is rotated relative to the longitudinal axis, which is parallel to the longitudinal axis of the lower roll, in a position corresponding to the maximum deformation;

in FIG. 7 is a side view of the upper roll and lower roll, which is made with a variable radius and rotated by a predetermined angle around its longitudinal axis;

In the drawings, the following notation is used:

1 - bed;

2 - upper roll;

3 - lower roll;

4 - clip;

5 - lead screw;

6 - gear;

7 - gear;

8 - gear;

9 - reversible electric drive;

10 - reversible electric drive;

11 - a guide;

12 - guide;

13 - a device for the stepwise movement of a flat workpiece;

14 - the upper roll of the device for the stepwise movement of the flat workpiece;

15 - lower roll of the device for stepwise movement of a flat workpiece;

16 - drive incremental rotation of the lower roll 3;

17 - the longitudinal axis of rotation of the lower roll 3;

18 - the longitudinal axis of the lower roll 3;

19 - guide rollers;

20 - feed drum;

21 - receiving drum;

22 - flat long workpiece.

In a specific exemplary embodiment, the stepping mill for rolling lengthy flat billets comprises (Fig. 1 and Fig. 2) an upper roll 2 with a smooth barrel and a lower roll 3 with a smooth barrel installed in the frame 1 using vertical mounting mechanisms. The lower roll 3 is fixed from rotation around its axis. The upper roll 2 is mounted with the possibility of reciprocating movement along the working surface of the lower roll 3. The longitudinal axis O1-O1 of the upper roll 2 is located in a vertical plane that is perpendicular to the vertical plane in which the longitudinal axis O2-O2 of the lower roll 3 is located (Fig. 4 )

To ensure the reciprocating movement of the upper roll 2 (Fig. 2) along the working surface of the lower roll 3, the upper roll 2 is installed in a ferrule 4, which is connected through a spindle 5 and the gear system 6, 7 and 8 with a reversible electric drive 9 with an adjustable number speed, which is mounted on top of the bed 1. The rotation mechanism of the upper roll 2 is mounted on a cage 4 and contains a reversible electric drive 10 with an adjustable speed and with a gearbox. In parallel with the lead screw 5, guides 11 and 12 are fixed, on which, with the possibility of moving the lead screw 5, they can be fastened with a clip 4 with an upper roll 2 and an electric drive 10.

A device 13 for stepwise moving a long flat workpiece is made on the basis of a rolling stand in which an upper roll 14 with a smooth barrel and a lower roll 15 with a smooth barrel are installed for additional compression of the flat workpiece in thickness during its stepwise movement (Fig. 3).

The lower roll 3 can be equipped with a stepwise rotation drive 16, which is synchronized with the drive of the device 13 for stepwise movement of a flat lengthy workpiece (Fig. 1 and Fig. 3).

The lower roll 3 can be installed with the possibility of fixed rotation relative to the longitudinal axis 17, which is parallel to the longitudinal axis of this lower roll, to control the degree of compression of a flat long workpiece. In FIG. 5 shows the lower roll 3, which is rotated by a predetermined angle and fixed relative to the longitudinal axis 17, which is parallel to the longitudinal axis of the lower roll 3, in a position corresponding to the minimum deformation of a flat long workpiece characterized by a thickness h1. In FIG. 6 shows the lower roll 3, which is rotated by a predetermined angle and fixed relative to the longitudinal axis 17, which is parallel to the longitudinal axis of the lower roll 3, in a position corresponding to the maximum deformation of a flat long workpiece characterized by a thickness h2.

It is desirable that the radius of the lower roll 3 is 0.5-2.0 the radius of the upper roll 2, for example, in a specific example, the radii of the rolls are selected the same.

The lower roll 3 can be made with a variable radius, which varies from 0.5 to 2.0 of the radius of the upper roll along the length of the working surface, and is equipped with a rotation drive at a predetermined angle around the longitudinal axis 19, which coincides with the longitudinal axis of the roll 3. In a particular As an example, the lower roll 3 is rotated by an angle corresponding to the equality of the radii of curvature of the corresponding section of the lower roll 3 and the upper roll 2, and is fixed in this position (Fig. 7).

In the case of rolling strips, a long, lengthy billet is fed for rolling from the feed drum 20, which is located in front of the rolling device with the upper roll 2 and lower roll 3. After rolling, the tape is wound onto the receiving drum 21, which is located after the device 13 for stepwise moving the flat billet, made on the basis of a rolling stand (Fig. 3).

In a specific example, the mill stepping rolling flat lengthy workpiece works as follows. At the beginning of the process of rolling a long flat billet, the cage 4 with the upper roll 2 using a reversible electric drive 9, the gear system 6, 7, 8 and the spindle 5 are moved relative to the frame 1 in one of the extreme lateral positions.

From the feed drum 20, the long flat billet 22 is moved forward along the guide rollers 19 above the lower roll 3, passed through the device 13 for stepwise moving the flat billet, which is made on the basis of the rolling stand, and fixed on the receiving drum 21.

Using the vertical installation mechanism, the necessary clearance is established between the upper roller 2 and the lower roller 3 to realize the required compression of a flat long workpiece. They include a reversible electric drive 10, which rotates the upper roll, and a reversible electric drive 9, which through the screw 5 provides reciprocating movement of the upper roll 2 across the flat workpiece 22. The number of revolutions of the reversible electric drive 9 and the reversible electric drive 10 is set so that the linear rotation speed of the upper roll 2 was equal to the linear velocity of the upper roll 2 across the flat long workpiece 22.

The deformation of the flat long workpiece 22 is carried out by the upper roll 2 when it is moved by the lead screw 5 in the guides 11 and 12 across the flat long workpiece 22 along the working surface of the lower roll 3. After the upper roll 2 exits the limits of the flat long workpiece along its width, the limit switches operate, which electrically connected to the drive of the device 13 for the stepwise movement of a flat long workpiece, with a reversible electric drive 10, which rotates the upper roll, and with a reversible electric drive ode 9, which through the screw 5 provides reciprocating movement of the upper roll 2 across the flat workpiece 22. When this flat long workpiece 22 is moved relative to the lower roll 3 by a step, the direction of rotation of the upper roll 2 is reversed and the upper roll 2 begins to move across the workpiece in the opposite direction, returning to its original position, and again deforms the workpiece. In the extreme positions of the upper roll 2, after it leaves the flat long billet 22, everything is repeated. The step of moving a flat long workpiece is 0.2-1.0, for example 0.5, the length of the deformation zone on the lower roll 3.

The reciprocating movement of the upper roll across a flat lengthy workpiece with its adjustable feed step forward provides the workpiece deformation in the transverse direction with the metal flowing into broadening. Depending on the amount of compression of the flat workpiece and the step of its movement, periodic transverse waves are formed on its lower surface. After passing a long flat billet through the smooth rolling rolls 14 and 15 of the device 13 for stepwise moving the flat billet, these waves are smoothed out.

When supplying the lower roll 3 with a step-by-turn drive 16, which is synchronized with the drive of the device 13 for step-by-step movement of a flat long workpiece (Fig. 1 and Fig. 3), with each step of moving the flat workpiece 22, the lower roll 3 also rotates simultaneously with the movement of the flat long workpiece . At the next working stroke, the upper roll 2 will deform the flat long billet 22 in a new section of the lower roll 3, which prevents the radius of curvature of the working surface of the lower roll 3 from being prematurely worn and helps to increase the uniformity of deformation of the flat long billet along its length.

In some cases, when rolling strips from difficultly deformed alloys, it is necessary to select the optimal length of the deformation zone. If the lower roll 3 is mounted with the possibility of a fixed rotation about a longitudinal axis 17, which is parallel to the longitudinal axis of this lower roll, then to control the degree of compression of the flat long workpiece 22, it is sufficient to turn the lower roll 3 around the longitudinal axis 17 by a predetermined angle, providing a given length of the deformation zone, and fix it in this position.

If the lower roll 3 is made with a variable radius, which varies from 0.5 to 2.0 of the radius of the upper roll along the length of the working surface, and is equipped with a rotation drive for a given angle around the longitudinal axis 18, which coincides with the longitudinal axis of the lower roll 3, then for selection of the optimal length of the deformation zone when rolling strips of difficult to deform alloys, it is enough to turn the lower roll by a predetermined angle, which provides the specified length of the deformation zone, and fix it in this position.

The deformation of a long flat billet 22 during the rolling process between the upper roll 2 and the lower roll 3 is not carried out simultaneously over its entire width, but locally, sequentially in parts, in the transverse direction, which makes it possible to work on difficultly deformed steels and alloys with very large compression ratios, so as in this case, the upper roller 2 and the lower roller 3 do not experience heavy loads.

Claims (6)

1. A mill for step rolling of flat long workpieces, including a device for stepwise moving a flat long workpiece and rolls with a smooth barrel installed in the frame, one of which is installed with the possibility of reciprocating movement and reverse rotation for deformation of the flat workpiece forward and reverse after stepwise movement blanks, characterized in that the longitudinal axis of the upper roll is located in a vertical plane perpendicular to the vertical plane in which ozhena longitudinal axis of the lower roll, the upper roll has a reversible drive and mounted for reciprocating movement along the bottom of the roll and the slab deformation in the transverse direction of the forward and return stroke after its stepwise movement. 2. The mill according to claim 1, characterized in that the lower roll is equipped with a step-by-step rotation drive, which is synchronized with a step-by-step movement drive of the workpiece. 3. The mill according to claim 1, characterized in that the device for stepwise moving the flat workpiece is made in the form of a rolling stand, in which rolls with a smooth barrel are installed, made with the possibility of additional compression of the workpiece in thickness during its stepwise movement. 4. The mill according to claim 1, characterized in that the lower roll is mounted with adjustable rotation relative to the longitudinal axis, which is parallel to the longitudinal axis of this lower roll, to control the degree of compression of the workpiece. 5. The mill according to claim 1, characterized in that the radius of the lower roll is 0.5-2.0 of the radius of the upper roll. 6. The mill according to claim 1, characterized in that the lower roll is provided with a rotation drive at a predetermined angle around its longitudinal axis and is made with a variable radius, which varies from 0.5 to 2.0 of the radius of the upper roll.

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