KR960016455B1 - Rolling mill - Google Patents

Abstract

none

Description

Rolling mill

1 is a broken side view showing the main part of a rolling mill of the present invention having a roll cross device and a sleeve roll type backup roll;

2 is a cutaway front view of FIG.

3 is a diagram showing an example of a crown pattern in the rolling mill according to an embodiment of the present invention.

4 is a cross-sectional view showing a plate crown on a rolled sheet.

5 is a diagram showing dimensions of a rolling mill used for numerical calculation of a plate crown control range by three kinds of rolling mills.

6 is a graph showing the calculation results of the control range of the plate crown by three kinds of rolling mills.

7 is a graph showing the crown of the rolled plate when various crown control functions are used in the rolling mill according to the present invention.

8 is a view showing the concept of an example of a conventional cross-roller rolling mill.

FIG. 9 is a front view showing a broken backup roller of an example of a conventional roll roll mill. FIG.

FIG. 10 is a diagram showing an eccentric state of each eccentric portion with respect to the axial center of the roll support shaft in each divided roller shown in FIG. 9, and a rotational trajectory of each divided roller; FIG.

FIG. 11 shows the crown pattern of the work roller at each rotation angle of FIG. 10; FIG.

* Explanation of symbols for main parts of the drawings

1: Roll support shaft 2: Center eccentric

3: middle eccentric 4: both ends of eccentric

5: rolling bearing 6: sleeve

7: center division roller 8: middle division roller

9: Both ends split 10: Backup roll

11: Walkthrough 12: Walkthrough Chuck

13: Backing up the roll 14: Crosshead

15: hydraulic cylinder 16: rod portion

17: worm wheel 18: worm

20: housing 21: backup roller

C ₁ : shaft center C ₂ , C ₃ , C ₄ : center

S: Rolled Material

The present invention relates to a rolling mill having a roll cross device and a sleeve roll backup roll.

8 shows the concept of an example of a conventional cross-roller rolling mill, and rotates the upper and lower work rollers 11 and the backup rollers 21 in the direction opposite to each other by rotating them in the opposite direction up and down about the center portion in the direction of the roll axis. The plate crown of the rolling material S is controlled by adjusting the angle.

9 is a rupture of a backup roll of an example of a conventional sleeve roll mill, and this backup roll 10 is provided with a central eccentric portion 2, an intermediate eccentric portion 3, and both end eccentric portions 4. Outer ring which is divided into five rolls in the axial direction and rotatably inserted through rolling bearings 5 on the eccentric portions 2, 3, and 4 respectively. That is, the divided rollers (7), (8), and (9), and the divided rollers (7), (8), and (9), respectively, are accommodated, and each divided roller according to the rotation of the work roller (11). It consists of the sleeve 6 which rotates with (7), (8), and (9).

FIG. 10 shows the centers C2 and C3 of the eccentric portions 2, 3, and 4 with respect to the axial center C1 of the roll support shaft 1 in each divided roller shown in FIG. ) And (C4) the eccentric state and the rotational trajectories of the divided rollers (7), (8) and (9), and the crown pattern of the work roller (11) in the rotational movement angle is shown in FIG. It is as shown in.

Then, the roll supporting shaft 1 is rotated at an appropriate angle to push down the work roll 11 to control the plate shape of the rolled material S. As shown in FIG.

By the way, in the conventional cross-roller rolling mill shown in FIG. 8 among the above-mentioned prior arts, the rolling material is simple by adjusting the gap between the upper and lower work rollers, which corresponds to the V-shaped crown of the work roller by roll bending. Pancrown of the central kidney or the end kidney can be controlled, but mixed kidneys such as the central kidney, middle kidney, end kidney, etc. are inconvenient to control.

In the rolling mill having a sleeve roll back-up roll as described in FIGS. 9 to 11, it is possible to control the compound elongation by forming the V, W, V, M-shaped crowns on the work rollers, but the crown pattern In order to increase the eccentricity of each of the divided rollers, if the eccentricity of each divided roller is made too large, the load that each rolling bearing bears increases, which causes inconvenience in reducing the service life of the rolling bearing and the sleeve.

SUMMARY OF THE INVENTION The present invention aims at eliminating the drawbacks seen with the conventional ones in a rolling mill. The crown pattern is controlled with respect to the work roller without increasing the eccentricity of each divided roller while employing a sleeve roller back-up roller. An object of the present invention is to provide a rolling mill.

In addition, the present invention relates to a crown pattern which is remarkably diversified in a rolling machine having a roll cross device that crosses each axial center of the upper and lower work rolls and the upper and lower backup rolls in circumferential contact with the copper work rolls in a plane parallel to the rolling plate surface. The purpose is to allow control to be performed on the work roller.

In addition, the present invention provides a rolling mill having a roll cross device that crosses the shaft centers of the upper and lower work rolls in a plane parallel to the rolling plate surface, so that the control of the crown pattern that is significantly diversified can be performed on the work rolls. It is aimed.

The rolling mill is equipped with the roll cross device which cross | intersects each axial center of the up-down work roll and the up-down backup roll in circumferential contact with the said work roll in the plane parallel to a rolling board surface, and rolls a metal plate material between the said work rolls. In order to achieve the above object, in order to achieve the above object, the backup roll is divided into at least three in the axial direction, and the plurality of rolls are rotatably mounted so as to be eccentric with respect to one roll support shaft whose rotational movement angle is also adjustable. At the same time, a configuration in which a sleeve roll-type back-up roll is stored in a plurality of rolls in one sleeve is adopted.

Moreover, in order to achieve the said objective in the rolling machine provided with the roll cross device which crosses the axial center of a top and bottom work roller in the plane parallel to a rolling board surface, and rolls a metal plate material between the said work rollers, A backup roll-type backup roll having the above-described configuration is used as the backup roller in circumferential contact with the roll.

In the rolling mill according to the present invention having the above-described configuration, it is possible to make the rolled metal sheet material between the work rolls by the forward and reverse rotation of the work rolls as a large heated rolling mill during the reciprocating run.

In addition, the rolling according to the present invention having the above-described configuration is carried out at the place where the final rolled material is rolled, that is, in a post rolling mill including at least the final end of the reversible rolling mill and the cold or hot rolled steel rolling mill. It is effective to demonstrate the ability.

Moreover, in the rolling mill which concerns on this invention, it can comprise as what employ | adopted the sleeve roll type | mold backup roller of the said structure in either of a top-down backup roller.

As described above, according to the rolling mill of the present invention, at least one of the upper and lower backup rolls which are in circumferential contact with the work roller is a sleeve roller type backup roller, and a crown pattern is formed on the work roller by pressing down the backup roller. At least the upper and lower work rollers cross each other, the cross angle is adjusted, and the crown pattern is added to the V-shaped crown to form an optimal crown pattern for the work rollers, Complex plate defects can be controlled simultaneously.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same member and site | part as the prior art apparatus shown in FIGS. 8-10, and the overlapping description is abbreviate | omitted.

In FIG. 1 and FIG. 2, (12) is an up-and-down work-roll choke, and supports the up-and-down work-roll 11, respectively.

The shaft centers of the upper and lower work rolls 11 are arranged so as to cross each other in a plane parallel to the plate surface of the rolled sheet material.

Numeral 13 denotes a vertical backup roll choke, and supports the roll support shafts 1 of the vertical backup roll 10 in circumferential contact with the work roll 11.

In the case of this embodiment, the backup roll 10 is also arranged such that the shaft centers cross each other, similarly to the work roll 11.

The work roll choke 12 and the backup roll choke 13 are slidably fitted in respective crossheads 14 which are slidably lined on both sides of the housing 20 in a slidable direction.

15 is a hydraulic cylinder, and is built in both outer sides of the housing 20, and the rod part 16 is connected to each crosshead 14 through the housing 20. As shown in FIG.

Reference numeral 17 denotes a worm wheel respectively fitted to the upper and lower roll support shafts 1, and 18 denotes a worm which rotates by a driving device not shown.

The backup roll 10 is provided with a roll supporting shaft 1, which is provided with a central eccentric portion 2, an intermediate eccentric portion 3, and both end eccentric portions 4, as in the conventional apparatus shown in FIG. , The outer ring, which is divided into five in the axial direction, and rotatably fitted to each of the eccentric portions 2, 3, and 4 via the rolling bearing 5, ie, the divided rollers 7, 8 And (9), and each of the divided rollers (7), (8), and (9), and each of the divided rollers (7), (8), (9) and according to the rotation of the work roller (11) It consists of a sleeve 6 which rotates together. (7) is the center division roller, (8) is the middle division roller, and (9) is the end split roller.

Next, the operation of the apparatus will be described.

In the rolling of the rolled material S, the upper and lower work rolls 11 arranged by crossing the shaft centers are driven to rotate, and the roll supporting shafts 1 of the upper and lower backup rolls 10 are worm 18 and the worm wheels ( 17) to form a crown pattern on the upper and lower work rolls 11 by rotating at an appropriate angle.

If the V-shaped crown of this crown pattern is insufficient, the upper and lower work rolls 11 and the backup rolls 10 cross each other from the top and bottom by the hydraulic cylinder 15 around the axial center portion thereof, and the cross angle By adjusting, plate shape defects, such as a plate crown and composite elongation, of the rolling material S are controlled.

As another embodiment of the present invention, the sleeve roll-type backup roller may be disposed only on one of the upper and lower sides.

As another embodiment, only the upper and lower work rollers may be crossed without crossing the backup rollers.

In another embodiment, even if the present invention is applied to a drive device for forward and reverse rotation of the work roller and a reversible rolling mill for rolling the rolled sheet material back and forth through the mill by installing forward and reverse traveling equipment before and after the mill, do.

The rolling mill according to the present invention has a shape control capability that can cope with a shape defect of the rolling material of all types. Therefore, it is preferable to arrange the rolling mill according to the present invention in a place where the rolling material to be the final product is rolled, and specifically, a rear end including at least the final end of the reversible rolling mill and the cooling or hot band rolling mill.

In the rolling mill of the present invention, the crown pattern is shown as an example in the case of employing the configuration shown in FIG.

In FIG. 3, the "eccentricity" column corresponds to FIG. 10, and for the sake of simplicity, the centers C ₂ , C ₃ , C of the eccentric portions 2, 3, and 4 are simplified. Only the eccentric position of ₄ is indicated.

In addition, ((9) small diameter) is added in () means that the diameter of the split roller 9 at both ends is smaller than the other two characters (center (7) and middle (8)) to fine-tune the crown pattern. It is displayed. It can be seen from FIG. 3 that an appropriate crown pattern can be formed by appropriately selecting an eccentric state.

Next, in order to clarify the difference between the function of the rolling mill according to the present invention having a roll cross device and a sleeve back-up roll, and the function of the sleeve roll-type back-up roll, including a conventional four-stage rolling mill, a plate crown The control ranges were specifically compared by numerical calculation. As shown in FIG. 4, the pan crown is shown by the following numerical value here.

Read-out plate crown C ₂ = hc-he

Quarter plate crown C ₄ = hc-hQ

Where hc plate width center plate thickness

hQ thickness at 1/4 point

Plate thickness at 25 mm from hE plate tip

Each part dimension of the rolling mill as a calculation condition is shown in FIG. The rolling conditions are three levels of read 800mm / 30mm, 2000mm, and the rolling load is 0.8tf / mm. As a function for controlling the crown, it is a work-roll bending in a conventional four-stage rolling mill, the cross angle of the work-roller rolling mill up to 1.5 degrees / one side, the sleeve roll-type backup roller is to be applied only to one of the vertical backup roller.

The calculation results are shown in FIG. The transverse axis | shaft was a rolling mill type, and the three types of rolling mills of the four-stage rolling machine, the sleeve roll type backup roller, and the sleeve roll type backup roller rolling machine provided with the roll cross apparatus by this invention were compared. The lower half 6 degrees, the board for the control of sheet crown C ₂ in pokkkeut part, to a further upper half represents the control amount △ C ₄ of the plate crown C ₄ in the quarter portion. (△ of C ₄ means To be described later). In the roll-cross method, the control range of C ₂ can be greatly widened, but the control amount of C ₄ is small, on the contrary, it can be seen that the control amount of C ₄ of the sleeve roller backup roller is large.

Therefore, the rolling mill according to the present invention combining both of them can cope with a shape defect of the rolling material of all types.

The calculation result of FIG. 6 is shown in more detail about the case of reading 2000mm, FIG. A seventh plate in the plate to turn the vertical axis portion pokkkeut the crown C ₂ takes the plate crown C ₄ in the quarter portion of the horizontal axis, and shows the crown of the plate at the time when using the various crown control functions. For example, the lozenge connecting points A, B, C, and D represents a change in the plate crown when the roll cross angle is fixed at 0 ° and the sleeve roll-type back-up roll is one week. If the cross angle is increased from 0, the coordinate point displaying the pan crown will gradually move to the lower left, and when the cross angle is fixed at 1.5 degrees, the crown crown will be A ¹ , B ¹ It may be represented by, C ¹ , D ¹ .

Therefore, if the crown pattern of the backup roller is constant, the crown cross will only move, for example, on a straight line connecting points C and C '.

On the other hand, by changing the crown pattern by the sleeve roll-type back-up roller, the plate crown can take any point inside the hexagon that connects the points A, B, B ¹ , D ¹ , C ¹ , C. .

Quarter plate crown control amount ΔC ₄ shown at the top of FIG. 6 represents the width in the horizontal axis direction of the hexagon.

As mentioned above, although some Example of this invention was described variously, this invention is not limited to each said Example, It can variously change a design within the range of the technical idea of this invention.

As described above, the rolling mill of the present invention is provided with a roll cross device and a sleeve roll type backup roll to add a V shape cross of each crown pattern of V, W, V, M shapes by the sleeve roll type backup roll. Therefore, each crown pattern is further diversified, and complicated plate shape defects such as plate crown of the rolled material and composite elongation can be simultaneously controlled.

In addition, the plate shape can be sufficiently controlled without increasing the eccentricity of each divided roller, and the life of the rolling bearing supporting each divided roller can be extended.

Claims (8)

The rolling mill is equipped with a roll cross device which crosses each axial center of the upper and lower work rolls and the upper and lower backup rolls in circumferential contact with the copper work rolls in a plane parallel to the rolling plate surface, and rolls the metal sheet material between the work rolls 11. The back-up roll 10 is divided into at least three or more in the axial direction, and the plurality of rolls 2, 3, and 4 are eccentric with respect to one roll support shaft 1 whose rotational movement angle is also adjustable. A rolling mill-type back-up roll, which is rotatably mounted and has a plurality of rolls (2, 3, 4) housed in one sleeve (6). In the rolling machine provided with a roll cross device which crosses the shaft centers of the upper and lower work rollers in a plane parallel to the rolling plate surface, and rolls the metal sheet material between the work rollers, The roll is divided into at least three or more in the axial direction, and the plurality of rolls 2, 3, and 4 are rotatably mounted so as to be eccentric with respect to one roll support shaft 1, which is also capable of adjusting a rotational movement angle. Rolling mill characterized in that it is provided with a sleeve roll-type backup roll in which the plurality of rolls (2, 3, 4) are all housed in one sleeve (6). The rolling mill according to claim 1, further comprising a drive mechanism for rotating the work roll (11) forward and backward and reciprocating the rolled metal sheet material between the work roll (11). In the rolling machine provided with the roll cross apparatus which crosses each axial center of the up-down work roll and the up-down backup roll in circumferential contact with the copper work roll in the plane parallel to a rolling piece surface, and rolls a metal plate material between the said work rollers, The said The back-up roll 10 is divided into at least three or more in the axial direction, and the plurality of rolls 2, 3, and 4 are eccentrically rotated with respect to one of the roll supporting shafts 1, each of which has an adjustable rotational angle. And a rolling roll-type back-up roll in which the plurality of rolls 2, 3, and 4 are all housed in one sleeve 6, and the rolling mill is installed at the final stage of the strip-rolling line. Rolling mill. In the rolling machine provided with the roll cross device which crosses each axial center of the up-down work roll and the up-down back-up roll in circumferential contact with the copper work roll in the plane parallel to a rolling board surface, and rolls a metal plate material between the said work rolls, The said One of the up and down backup rolls 10 is divided into at least three rolls in the axial direction, and the plurality of rolls 2, 3, and 4 are rotated with respect to one roll supporting shaft 1 whose rotational movement angle is adjustable. A rolling mill-type back-up roll, characterized in that each of the plurality of rolls (2, 3, 4) is rotatably mounted so as to be rotatably mounted and housed in one sleeve (6). In the rolling machine equipped with a roll cross device for crossing the shaft center of the upper and lower work rollers in a plane parallel to the leaf plate surface, and rolling the metal sheet material between the work rollers, the upper and lower contacts circumferentially contacting the work roller 11 One of the rolls of the backup roll is divided into at least three in the axial direction, and the plurality of rolls 2, 3, and 4 are eccentrically rotated with respect to one roll support shaft 1 whose rotational movement angle is also adjustable. A rolling mill characterized in that it is mounted as possible and provided with a slow-type back-up roll in which the plurality of rolls (2, 3, 4) are all housed in one sleeve (6). The rolling mill according to claim 2, further comprising a drive mechanism for rotating the work roll (11) forward and reverse, and reciprocating the rolled superposed sheet material between the work roll (11). In the rolling machine provided with a roll cross device which crosses the shaft centers of the upper and lower work rollers in a plane parallel to the rolling plate surface, and rolls the metal plate material between the work rollers, the peripherally contacted with the work roller 11, The roll is divided into at least three or more in the axial direction, and the plurality of rolls 2, 3, and 4 are rotatably mounted so as to be eccentric with respect to one roll support shaft 1, which is also capable of adjusting a rotational movement angle. It is characterized in that the rolling mill is equipped with a sleeve roll type backup roll in which the plurality of rolls (2, 3, 4) are all housed in one sleeve (6). Rolling mill.