JP2851473B2 - Work roll position correction device for cross roll rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting the position of a work roll moving in the roll axis direction along with a thrust receiving device when a work roll cross angle of a cross roll rolling mill is changed.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of a cross roll rolling mill. It is the fracture | rupture top view and side view which show the cross roll rolling mill which crosses only a work roll, and a thrust receiving device.

In the upper figure, a projection 63 is provided on an entrance A and an exit B of a roll chock 52 for supporting a work side W of upper and lower work rolls 51, and a substantially L-shaped lever 64 is provided.
Are respectively pivoted.

[0004] Both levers 64 are rotatably connected by a link 66, and rollers 62 are rotatably mounted on both shafts 65 protruding from each lever 64.

[0005] The thrust receiving block 61 is disposed on the inlet side A and the outlet side B of the housing 56, and a roller 62 is fitted in a guide groove 61a. 53 is a backup roll.

[0006] The cross head 57 includes a roll chock 52.
So that the housing 5 is held between the inlet side A and the outlet side B.
6 are implanted on the entry side A and the exit side B, and are moved in the entry / exit direction by the moving device 58.

When the rolled material 50 is rolled, the upper and lower roll chocks 52 are rotated about the center point (cross point) in the roll axis direction by the movement of the cross head 57 to cross the upper and lower work rolls 51 at a required cross angle. The roller 62 linearly moves along the guide groove 61a by the four-bar linkage mechanism including the lever 64 and the link 66.

That is, as shown in FIG. 6, when the roll axis C ₅₁ of the lower work roll 51 is set to a required cross angle from the work roll center C, the cross point O and the connection between the projection 63 and the lever 64 are established. Triangle O formed by points a and b
ab moves on the radii Oa and Ob around the cross point O as indicated by the chain line.

The triangles acd and bef formed by the connection points d and e of the lever 64 and the link 66 and the center points c and f of the roller 62 are each formed by abed.
It moves to the position shown by the chain line by the node link mechanism.

[0010]

However, in the four-link thrust receiving apparatus described above, the movement of the work roll 51 when the cross angle is increased can be approximated to an arc movement, but strictly speaking, a true arc is required. It does not move, and the position of the work roll 51 in the axial direction of the roll is shifted to the work side W where the thrust receiving device is installed as the cross angle of the work roll 51 increases. Accordingly, the axial position of the roll profile of, for example, the initial crown of the work roll 51 designed to optimize the thickness accuracy and the flatness is shifted.

Particularly, when a roll profile having one end of the work roll 51 formed into a tapered shape is used and edge-up rolling is performed so that the edge of the rolling mill matches the tapered portion of the work roll 51, a desired position is required. Since the desired purpose cannot be achieved because the tapered portion is shifted from the above, it cannot be used for a cross roll rolling mill. The present invention has been made in view of the above-described conventional technology, and detects an axial deviation amount due to a change in the cross angle of the upper and lower work rolls, and corrects the axial deviation amount. It is an object of the present invention to provide a device that can always make the center of the rolling mill in the sheet width direction coincide with the axial center of the roll profile.

[0012]

In order to achieve the above object, the present invention provides a cross rolling mill in which upper and lower work rolls, together with upper and lower work roll chocks, cross each other on a horizontal plane to adjust the cross angle of the upper and lower work rolls. A work roll position detector for detecting an axial shift amount due to the change in the cross angle between the upper and lower work rolls and the work roll chock; and a work roll for moving the work roll and the work roll chock in the roll axial direction based on the axial shift amount. An axial position correcting means is provided.

[0013]

When the cross angle .theta. Of the upper and lower work rolls is changed, the work roll position detector detects the amount of displacement of the work roll in the axial direction, and the work roll axial position correcting means detects the work roll and the work roll. The roll chock is moved in the roll axis direction by the above-mentioned axial displacement and returned to the original position, and the work roll axis position is corrected.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. The same members and parts as those of the prior art device are denoted by the same reference numerals, and redundant description will be omitted. 1 and 2, reference numeral 1 denotes a work side roll position detector, 2 denotes a drive side roll position detector, and the work side W
And the drive side D and the output side crosshead 7b.

Reference numeral 11 denotes a thrust receiving block. A roller 62 is inserted into the guide groove 11a, and slides freely in the guide groove 12a of the frame 12 mounted on the entrance A and the exit B of the housing 56, respectively. It is fitted in.

Reference numeral 15 denotes an incoming hydraulic cylinder, and 16 denotes an outgoing hydraulic cylinder. The incoming hydraulic cylinder is interposed between the thrust receiving block 11 and the frame 12 on the incoming side A and the outgoing side B, and connected to the control device 3. It is connected to a hydraulic device (not shown) via a servo valve 13 and an output side servo valve 14. Reference numeral 17 denotes an incoming rod position detector, and reference numeral 18 denotes an outgoing rod position detector, which are mounted on the incoming hydraulic cylinder 15 and the outgoing hydraulic cylinder 16 and connected to the control device 3.

As shown in FIG. 3, the control device 3 includes a roll shift amount calculation unit 21 to which the work side roll position detector 1 and the drive side roll position detector 2 are connected, a rod movement amount calculation unit 22, The servo valve 13 includes an inlet servo valve 13, an outlet servo valve 14, an inlet rod position detector 17, and a servo valve operation instruction unit 23 to which an outlet rod position detector 18 is connected.

When the rolled material 50 is rolled, the crossheads 7a and 7b are moved by the moving device 58, and the upper and lower roll chock 52 and the work roll 51 are moved to the cross point O.
, The upper and lower work rolls 51 are crossed at a required cross angle θ in opposite directions.

At this time, the entry side surface 52a of the roll chock 52 on the work side W facing the work side roll position detector 1.
As shown in FIG. 2, the exit side surface 52 b of the drive side D roll chock 52 facing the drive side roll position detector 2 moves to the cross point O by eaw and ebd, respectively, and the exit side of the working side W. The side surface 52b and the entrance side surface 52a of the driving side D move in the direction opposite to the cross point O (the working side W and the driving side D).

Assuming that the work roll 51 and the roll chock 52 are not displaced in the roll axis direction, ea
w = ebd, ebw = ead, and eaw> ebw,
ebd> ead.

Therefore, eaw and ebd having a large moving amount
Is detected by the work-side roll position detector 1 and the drive-side roll position detector 2, and the roll deviation amount calculation unit 21 calculates the roll deviation amount δ. δ = (eaw−ebd) / 2

Next, the rod moving amount calculating section 22 calculates
From the roll deviation amount δ, a rod movement amount l for moving the rod portions 15a and 16a of the hydraulic cylinders 15 and 16, ie, an amount for moving the work roll 51 and the roll chock 52 to their original positions is calculated. l = δ · cos θ where θ is the cross angle θ.

The servo valve operation instructing section 23 operates the respective servo valves 13 and 14 according to the rod moving amount l, moves both rod portions 15a and 16a by the rod moving amount 1 and moves the work roll 51 in the axial direction. And returns to the original position, and corrects the axial position.

The entrance rod position detector 17 and the exit rod position detector 18 detect the rod movement amount l of each of the rods 15a and 16a, and feed back to the servo valve operation instructing section 23 to obtain the rod movement amount. Check l.

In the above, the upper work roll 51 and the roll chock 52 have been described. However, in the lower work roll 51 and the roll chock 52, the entrance A and the exit B are reversed.

If each cross angle θ is accurate,
The cross point O does not shift. Although the above embodiment uses an example of a cross roll rolling mill that crosses only upper and lower work rolls, the present invention is also applicable to a pair cross rolling mill that crosses upper and lower work rolls and backup rolls in pairs. It is.

[0027]

As described above in detail with reference to the embodiment, the present invention detects the work roll position by detecting the amount of axial displacement caused by a change in the cross angle θ of the upper and lower work rolls supported in the axial direction by the thrust receiving device. The axial center of the work roll profile always coincides with the center in the sheet width direction of the rolling mill, regardless of the cross angle θ, by detecting the axial deviation amount by the work roll axial position correcting means. Therefore, a rolled material having high plate thickness accuracy and plate shape accuracy can be obtained. Further, a taper roll in which one end in the axial direction is tapered can be used for a cross roll rolling mill.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing a working side of a cross roll rolling mill according to an embodiment of the present invention.

FIG. 2 is a plan view for explaining movement of a roll chock side surface by a roll cloth.

FIG. 3 is a block diagram showing a control system of FIG. 1;

FIG. 4 is a partially cutaway plan view showing the working side of an example of a conventional cross roll rolling mill.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a plan view for explaining the operation of the thrust receiving device of FIGS. 4 and 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work side roll position detector 2 Drive side roll position detector 3 Control device 7a Incoming crosshead 7b Outgoing crosshead 11 Thrust receiving block 13 Incoming servo valve 14 Outgoing servo valve 15 Incoming hydraulic cylinder 16 Outgoing hydraulic pressure Cylinder 17 Inlet rod position detector 18 Outlet rod position detector 51 Work roll 52 Roll chock A Inlet B Outlet D Drive side W Work side O Cross point θ Cross angle θ

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 1 / 22,13 / 14,31 / 16-31 / 18,3 7/00

Claims (1)

(57) [Claims] 1. A cross rolling mill in which upper and lower work rolls are crossed with each other on a horizontal plane together with upper and lower work rolls to adjust a cross angle of the upper and lower work rolls. A cross provided with a work roll position detector for detecting an amount of axial displacement, and a work roll axial direction correcting means for moving the work roll and the work roll chock in the roll axis direction by the amount of axial displacement. Work roll position correction device for roll mill.