JPS5829163B2 - quadruple rolling mill - Google Patents

Description

[Detailed description of the invention] The present invention relates to a quadruple rolling mill.

When rolling a plate material rolled by an old quadruple rolling mill, the work rolls of the rolling mill are subjected to rolling separation force, rolling power, and rolling tension from the rolled plate material.

Therefore, in actual rolling work, the work rolls are subjected to a vertical component force and a horizontal component force due to the inclined surface corresponding to the amount of reduction of the rolled plate material, and at the same time, the work rolls are subjected to a horizontal reaction force due to the rolling power and the rolling tension. Because it is subjected to horizontal force, etc., deflection occurs in the vertical direction, and in comparison, deflection occurs in the horizontal direction.

However, conventionally, the amount of bending deformation has been calculated on the assumption that all of the deflection of the work rolls occurs in the vertical direction, which has the disadvantage that the roll gap setting is not appropriate.

In addition, as the heat crown increases during rolling, the thickness of the rolled plate varies, making it difficult to control the shape.

The present invention has been made in view of the above-mentioned conventional drawbacks, and its purpose is to prevent bending deformation of the work roll by imparting a horizontal moment and a vertical moment to the work roll in accordance with the rolling conditions, and to reduce the size and shape of the work roll. The aim is to provide a quadruple rolling mill with excellent control ability.

Next, the present invention will be explained with reference to the drawings, which are one embodiment of the present invention.The four-layer rolling mill shown in So1 has a left and right roll stand 1 having a bearing surface 4 of an upper backing roll 2 and a bearing surface 5 of a lower backing roll 3. between these bearing surfaces 4 and 5 are upper and lower work rolls 6.
Bearing surfaces 8, 9 are guided, each supporting a bearing surface 7.

This bearing surface 9 is provided with a roll gap setting screw 10 for adjusting the gap between the upper and lower work rolls 6.7.
A pulse motor (with a counter) 11 that rotates with a predetermined signal is connected to this, and a load cell (not shown) that detects the force applied to the roll gap setting screw 10VC is provided.

Cylinder plates N2 are installed on both insides of the roll stand 1 above.
．． 12 is fitted and clicked, and a cylinder block 13.13 having an arcuate recess 14 is mounted inside the cylinder block 13.13 so as to be movable forward and backward via a hydraulic cylinder 15.15 and rotatable in a vertical plane. Arc-shaped convex portions 16 and 16 provided on both sides of the bearing surfaces 8 and 9 of the upper and lower work rolls 6 and 7 are fitted into this recess 14.

Between this bearing surface 8 or 9 and the cylinder block 13 are four hydraulic cylinders 17a, 17b.

17ch and 17d are provided respectively, but these 4
Either pressurize two of the hydraulic cylinders 17a and 17c and depressurize the other two hydraulic cylinders 17bi and 17d, or
Or, in the opposite case, the bearing surfaces 8 and 9 rotate along the horizontal plane and apply a horizontal moment to the upper and lower work rolls 6 and 7, and the axes of the work rolls 6 and 7 are shown by dashed lines in FIG. It curves like that.

Moreover, six hydraulic cylinders 18a are provided between each cylinder block 13, 13 to which the bearing surfaces 8 and 9 fit, and between these and each bearing surface 4 or 5 of the upper and lower restraint rolls 2 and 3. , 18b, 18c.

18d, 18e buttons and 18f are provided, and this 6
Three hydraulic cylinders 18a, 18c button and 18e
Pressurize the other three buttons 18b, 18d and 18f, or do the opposite to pressurize the bearing surface buttons 8 and 9.
rotates along a vertical plane, and the upper and lower work rolls 6 and 7
It is designed to give a vertical moment to.

The upper holding roll 20 bearing box 4 is a pass line adjustment device 19
3 connected to the upper inner surface of the roll stand 1 via
This pass line adjustment device 19 is used to adjust the pass line of the rolled material.

On the other hand, the bearing surface 5 of the lower support roll 3 is supported by the lower inner surface 22 of the roll stand 1 via a bush amplifier cylinder 21.

Next, a case will be described in which a rolling operation is performed using a four-layer rolling mill configured as described above.

In FIG. 4 KL-, when the rolled plate material advances in the direction of the arrow a shown in the figure, the rolled plate material is subjected to rolling tension in the direction of movement during rolling, and the upper and lower work rolls 6j=- and 7 are driven by a drive device (not shown in the figure). They are each rotated in the direction indicated by the arrow in the figure by the power of the

Then, the upper and lower work rolls 6 and 7 are rolled and separated 1
Under the force that is the sum of the horizontal reaction force S caused by the button and the rolling power and the force T caused by the rolling tension, the rolled plate is deflected in the direction a of movement as shown in FIG. 5, and at the same time, Since vertical deflection is generated by the reaction force in the vertical direction due to the rolling separation force, in reality, a composite deflection is generated in the direction in which this vertical deflection and horizontal deflection τ are combined. Conceivable.

In order to prevent the combined deflection of the upper and lower work rolls 6 and 7, as shown in FIG. VC in the opposite direction to the X-X direction with respect to the deflection of
The appearance of f is to apply a horizontal button and a vertical moment to the upper and lower work rolls 6 and 7 so as to form the above composite deflection.

However, in reality, the center point 01 on the axes of the upper and lower work rolls 6 and 7 is not displaced by a point 02VC as shown in FIG.
This prevents one point from moving.

FIG. 8 is a block diagram showing a roll bending control method of a rolling mill, in which a hydraulic pressure detector 24 detects the push-up force of the bush-up cylinder 21 and this value is transferred to a converter 2.
5 to the adder 26, while the roll gap setting screw 1
The force applied to 0 is detected by the load cells on both sides, and these numerical values are sent to an adder 27 where they are added together, and sent via a converter 28 to the adder 26, and at the same time sent to the arithmetic unit 29. The device 26 sends to the calculator 30 the actual pressure separation force obtained by adding the equation 1 from the push-up cylinder 21 sent as described above and the numerical value from the load cell.

On the other hand, the rolling power 32 button and rolling tension 33 detected from the roll drive system are sent to the computing unit 30 via the computing unit 31.

This computing unit 30 sends the signals of the rolling separation force, rolling power 32 button and rolling tension 33 sent as described above to the computing unit 29.
send to

Then, this calculator 29 calculates these sent signals, the work roll diameter and backup roll diameter button and roll width of the already input set values, the known point ratio and Young's modulus of one shift, the button and the detector. The amount and direction of bending deformation that occurs during rolling of the upper and lower work rolls 6 and 7 are calculated using signals such as the rolling width, rolling plate thickness button, and reduction amount, and the calculated number [directly A corresponding signal is sent to the servo valve 34 which controls the oil pressure of the hydraulic cylinders 17 and 18.

This servo valve 34 sequentially controls the valves in response to these input signals, pressurizes the hydraulic cylinders 17b button and 17d, and at the same time pressurizes the hydraulic cylinders l7ah and 17c.
The hydraulic cylinder rotates the bearing surface 8 along the horizontal direction to apply a horizontal moment to the upper and lower work rolls 6 and 7 to prevent the rolled plate from bending in the advancing direction. Pressure is applied to hydraulic cylinders 18a, 18c, and 18e at the same time as pressure is applied to hydraulic cylinders 18b, 18d, and 18f, and the bearing surfaces 8 and 9 are rotated along the vertical direction to apply a vertical moment to the upper and lower work rolls 6 and 7. This prevents the rolled plate material from bending in the thickness direction.

By the way, in hot rolling, a heat crown occurs on the work rolls 6.7 due to the heat of the rolled plate material, making it difficult to control the shape of the rolled plate material.

Therefore, the hydraulic cylinders 17a to 17d are operated to curve the upper and lower work rolls 6.7 in the direction in which the rolled plate material travels or in the opposite direction.

Before the work roll 6.7 curves, the work roll 6.7 and the backing roll 23 are in line contact, but as the work roll 6.7 curves in the horizontal direction, the point of contact with the backing rolls 2 and 3 changes. changes, resulting in two-point contact.

Therefore, when the rolling load is applied, the work roll 6t
7 is bent in the vertical direction by the gap valve between the retainer rolls 2 and 3, and desired shape control corresponding to the heat crown can be performed.

Particularly, since the cylinder block 13 supporting the hydraulic cylinders 17a to 17d can be moved back and forth in the traveling direction of the rolled plate material or in the opposite direction by the hydraulic cylinder 15, offset is easy.

As is clear from the above description, the present invention provides a cylinder block rotatable in a vertical plane inside a roll stand, and a bearing surface for a work roll is provided between both cylinder blocks so as to be rotatable in a horizontal plane. When applying a horizontal moment to the work roll, the bearing surface is rotated horizontally by a hydraulic cylinder, and when applying a vertical moment, the cylinder block is rotated vertically by a hydraulic cylinder. did.

With this configuration, bending deformation of the work roll during rolling can be prevented, shape control corresponding to heat crown can be performed, and the above-mentioned horizontal/vertical moment applying mechanism can be compactly housed in the roll stand. can.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of a roll stand for a quadruple rolling mill of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1,
Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is an explanatory diagram showing the direction of the force applied to the work roll during rolling in Fig. 1, and Fig. 5 is a cross-sectional view of the work roll shown in Fig. 4. Figures 6 and 7 are explanatory diagrams showing the state of composite deflection formed by the horizontal moment and vertical moment of the work roll, and Figure 8 is a block diagram showing the roll bending control method. It is a diagram. 1... Left and right roll stand, 2... Upper backing roll, 310. ..., bottom roll, 4, 5, 8.9
...Curved bearing surface, 6°7... Work roll, 10.
... Roll gap setting screw, 14 ... Concave portion, 16 ... Convex portion, 17, 18 ... Hydraulic cylinder, 21 ...... Item Shuamp cylinder,
24...Hydraulic pressure detector, 25, 28...
・Converter, 26.27...Adder, 29,30
, 31... Arithmetic unit, 32... Rolling power, 33... Rolling tension, 34... Servo valve.

Claims (1)

[Claims] 1 A quadruple rolling mill VC button that applies a horizontal moment to horizontally curve the work rolls and a vertical moment to vertically curve the work rolls has roll stands 1 installed at both ends of the work rolls 6 and 7. , an arcuate recess 1 is provided inside the roll stand 1 so as to be movable forward and backward via a hydraulic cylinder 15 and rotatable in a vertical plane.
A cylinder block 13 having a cylinder block 13 having a cylinder block 4 and a convex portion 16 that rotatably fits in the recess 14 of the cylinder block 13 in a horizontal plane on both sides, and a bearing surface that rotatably supports both ends of the work roll 6.70. 8, 9, hydraulic cylinders 17a to 17d, which are provided between the bearing surfaces 8 and 9 and the cylinder block 13 and rotate the bearing surfaces 8 and 9 in the horizontal direction, and the upper and lower cylinder blocks 130, approximately above and below k. Backup roll 2, 3
A quadruple rolling mill comprising hydraulic cylinders 18a to 18f that are provided between the bearing surfaces 4 and 5 of the cylinder block 13 and the cylinder block 13 and rotate the cylinder block 13 in the vertical direction.