JPS607562B2 - rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In rolling equipment, it is desired to improve rolling efficiency for equipment or operational reasons.

On the other hand, recently, rolled materials are required to have good shapes. Given these requirements, rolling mills that can reduce the rolling force in rolling equipment can be expected to have great effects in terms of improving rolling efficiency and making it easier to control the shape of the rolled material. By proactively controlling the shape by providing a device, a rolled material with a very good shape can be efficiently obtained. In various metal rolling mills, it is well known that rolling force can be reduced if rolling is performed using small diameter work rolls.

In particular, rolling mills that roll metal materials with high deformation resistance are desired to have small diameter work rolls. However, when small-diameter work rolls are used, there is a problem that the drive mechanism of the small-diameter work rolls cannot maintain sufficient strength, and moreover, the work rolls are deflected in the horizontal direction due to the horizontal force received from the rolled material during rolling. , there is a problem in that it is not possible to obtain rigidity in the horizontal direction, which causes problems in rolling. However, in commonly used four-high and six-high rolling mills, the diameter of the work rolls is increased to a certain extent, which has the disadvantage of increasing rolling force. Here, an example of a four-high rolling mill used from the subordinate side is explained with reference to FIGS. 1 and 2. Work rolls 2a and 2b are provided on the upper and lower surfaces of the material to be rolled 1, respectively, and Backing rolls 3a and 3b are provided.

In addition, in FIG. 2, 4a and 4b are work rolls 2a and 2b.
It is a bag box. As a roll pending device that acts as a shape control device for such a rolling mill, a method is adopted in which a vertical pending force 5 or 6 is applied to the sea bream boxes 4a and 4b of the work rolls 2a and 2b. At present, sufficient bending force cannot be applied due to limitations on the strength of 4a and 4b, and furthermore, sufficient roll pending effects cannot be obtained due to resistance due to contact with backing rolls 3a and 3b. Furthermore, in rolling mills that use small-diameter work rolls, many intermediate rolls and backing rolls are placed before and after the work rolls 2a and 2b in order to solve the problem of horizontal rigidity. Such a rolling mill has disadvantages such as a large number of rolls, a complicated structure, and difficult maintenance and inspection.
The present invention eliminates these drawbacks, lowers the rolling force, and increases the ability to control the shape of the material to be rolled. A hold-down roll is brought into contact with the side opposite to the side that is applied to the material to be rolled, and a small-diameter work roll smaller in diameter than the work roll is pressed against the pond side of the material to be rolled. Between the backing roll provided on the side opposite to the side that contacts the material to be rolled and the small-diameter work roll, so that the backing roll and the small-diameter work roll are brought into contact with each other at the front and back positions of the small-diameter work roll. The gist of this invention is a rolling mill characterized by having two intermediate rolls, and comprising a device for suspending the two intermediate rolls in the horizontal direction and a device for moving the two intermediate rolls alternately in the axial direction. .

Next, an embodiment of the present description will be explained with reference to FIGS. 3 to 5. The work rolls in contact with the material to be rolled 1 have different diameters, and the work rolls 8 in contact with the lower side of the material to be rolled 1 are of the conventional type. The work roll that contacts the upper side of the rolled material 1 is a roll with a different diameter, which is a small dimple work roll 7 having a smaller diameter than the work roll 8 described above.

In this way, in an asymmetric rolling mill that combines the work roll 8 with a diameter almost equal to the diameter of the conventional work roll and the 4-ridge work roll 7 with a smaller diameter, the rolling force and torque are higher than in the past.・It is known that it becomes thinner. (Hakama-Seki Publication No. 49-77865, etc.) In order to supplement the rigidity of these small-diameter work rolls 7 and work rolls 8 against the rolling force P, backing rolls 11a and 11b are provided.

The backing roll 11b is provided so as to be in direct contact with the lower side opposite to the side where the work roll 8 is in contact with the rolled material 1,
The other backing roll 11a is provided at an upper side opposite to the side where the small-diameter work roll 7 contacts the material to be rolled 1 at a distance, and is in contact with the intermediate rolls 9 and 10. Therefore, the intermediate rolls 9 and 10 are in contact with the backing roll 11a and the small-diameter work roll 7 between the back-up roll 11a and the small-diameter work roll 7, and at positions before and behind the small-diameter work roll 7, respectively. To drive the work rolls, a drive device 14 is connected to the work roll 8 with a larger diameter to drive only the work roll 8, and the work roll 7 with a smaller diameter is used as an idler.

Since driving is performed by the work roll 8 having a larger diameter in this manner, sufficient rolling torque can be transmitted without problems due to insufficient rigidity. In this way, the small diameter work roll 7
By using this, rolling efficiency is improved, materials with particularly high deformation resistance can be rolled, and the rolling force can be reduced, making it easier to control the shape. In FIGS. 4 and 5, 12 is the koji box of the small-diameter work roll 7, 13 is the ball box of the work roll 8, and 17a and 17b are the backup rolls 11a, respectively.
, 11b are rattan boxes, 15 and 16 are intermediate rolls 9 and 10, respectively.
The inner shaft boxes 15' and 16' are intermediate rolls 9 and 10, respectively.
21 is a horizontal pending hydraulic cylinder provided in the inner axle boxes 15 and 16 to support the side wall of the housing 20; 22 is an outer axle box; 22 is a horizontal pending hydraulic cylinder provided between 15' and 16'; The hydraulic cylinders 23 and 24 are hydraulic cylinders serving as moving devices that alternately move the intermediate rolls 9 and 10 in the direction of the track line. In a rolling mill having such a configuration, the present invention provides hydraulic cylinders 21, 21 for intermediate rolls 9, 10' as shown in FIGS. 3 and 6.
, 22 in the horizontal direction, the small-diameter work roll 7 is rolled in the vertical direction, and the shape of the rolled material 1 is controlled. The material to be rolled 1 is rolled by the horizontal pending of intermediate rolls 9 and 10.
The shape control is performed by converting the amount of horizontal movement of the intermediate rolls 9 and 10 into the amount of vertical movement of the small-diameter work roll 7 by the so-called wedge effect, as shown by the two-dot chain line in FIG. That is, the intermediate rolls 9, 10 are moved by the horizontal pushing force.
The effect of this deflection appearing as a change in the vertical deflection of the work roll 7 is used to control the plate crown. FIG. 7 shows a case in which a pending force is applied to the intermediate rolls 9, 1 in the horizontal direction so that their central portions approach each other, and , 16' are hydraulic cylinders 21, 2.
1 and 22, and the center portions of the intermediate rolls 9 and 10 approach each other, thereby applying pressure 18 to the center portion of the small-diameter work roll 7 as shown in FIG. 7 is made to hang downward. As a result, the cross section of the material to be rolled 1 in the ball direction becomes a concave shape. Figure 9 shows intermediate rolls 9,1
A pending force PB is applied only by the hydraulic cylinders 21 and 21 to the bag boxes 15 and 16 of the intermediate rolls 9 and 10 so that both ends of the intermediate rolls 9 and 10 are brought close together, and as shown in FIG. A pressure 19 is applied to cause both ends of the small-diameter work roll 7 to suspend downward.

As a result, the axial cross section of the rolled material 1 becomes convex. As described above, by bending the intermediate rolls 9 and 10 in the horizontal direction, the contact pressure with the small-diameter work roll 7 is changed, the small-diameter work roll 7 is suspended, and the rolled material 1 is
However, as shown in FIG. 11, while the intermediate rolls 9 and 10 are moved alternately in the axial direction by hydraulic cylinders 23 and 24, the intermediate rolls 9 and 10 are moved horizontally. It is even more effective if you bend it.

By doing so, the deflection curve of the small-diameter work roll 7 can be varied, so that diverse shape control can be performed. That is, the intermediate roll 9
, 10 are moved alternately in the axial direction, the individual intermediate rolls 9, 10 are positioned asymmetrically with respect to the sheet width, and the position can be freely adjusted, as shown in FIGS. 12 and 13. It can be seen that the influence of the deflection curve due to horizontal pending on the ball direction of the rolled material 1 (the influence of changing the thickness distribution in the width direction) changes. In FIGS. 12 and 13, A indicates intermediate roll 9,
10 indicates the horizontal deflection curve, C indicates the vertical deflection curve of the small-diameter work roll 7, and C indicates the thickness distribution of the rolled material 1 in the width direction. Therefore, the two intermediate rolls 9,
By combining the horizontal pending of 10 and the movement in the inguinal direction, a new diverse distribution of deflection in the thickness direction of the small-diameter work roll 7 can be obtained in the width direction of the sheet, allowing for diversity in shape control. It's coming.

By the way, 4. which can reduce rolling force and transmit torque
Jitseki Sho 49-177865, which uses a method of driving a large-diameter work roll by a combination of a Yomo work roll and a large-diameter work roll.
In the one disclosed in the publication, the shape control ability was significantly reduced on the small diameter work roll side, and there was a problem in practical use unless this was strengthened, but in the present invention, this is replaced by two intermediate rolls 9, By skillfully combining 10 horizontal pending curves and the effect of alternating movement in the wisteria line direction, we have achieved a solution that provides diverse shape control capabilities.

On the other hand, in order to perform roll pending of the work roll 8 having a large diameter, a conventional axle box 13 (see FIG. 4) of the work roll 8 is used. - Similar to bending, a pending force may be applied in the vertical direction by a hydraulic cylinder, etc.
Alternatively, roll pending may be performed by intersecting the backup roll 11b and the work roll 8. As described above, the present invention is provided with two intermediate rolls between the front and back positions of the 4. flea work roll and the backing roll, and a device for moving the intermediate rolls in the inguinal direction and a horizontal pending device. , the roll pending effect is increased, the ability to control the shape of the material to be rolled is increased, and the deflection curve of the small work roll can be varied, which has the effect of allowing diverse shape control.

In addition, since large and small diameter work rolls are provided to drive the large diameter work roll, rolling force can be significantly reduced and rolling efficiency can be improved.

Since the roll can be made small and a large driving torque can be transmitted, metal materials with high deformation resistance can be rolled effectively, and it can also be used in large rolling mills.

[Brief explanation of the drawing]

Fig. 1 is a side view of the lozenge of the rolling mill in the secondary column, Fig. 2 is a front view of Fig. 1, Fig. 3 is a schematic side view of an embodiment of the present invention, and Fig. 4 is the same as Fig. 3. Front view, Figure 5 is V-V in Figure 4
Loss of sight diagram, Figure 6 is an explanatory diagram of the direction of pending force, Figure 7
The figure is a plan view of the small diameter work rolls pending so that the center parts are close together, Figure 8 is a front view of Figure 7, and Figure 9 is the small diameter work rolls pending so that both ends are close together. 10 is a front view of FIG. 9, FIG. 11 is a plan view of another embodiment of the present invention, FIG. FIG. 3 is an explanatory diagram showing changes in the deflection curve of a small-diameter working roll and the plate thickness distribution of a rolled material when horizontal pending and waviness direction movement are roughly combined in the roll. 1... Material to be rolled, 7... Koyo work roll, 8... Work roll, 9, 10... Intermediate roll,
11a, 11b... Back roll, 21, 22...
...Hydraulic cylinder, 23, 24...Hydraulic cylinder. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] 1. A work roll is pressed against one side of the material to be rolled and is driven to rotate. A backing roll is brought into contact with the side opposite to the side in contact with the material to be rolled, and the other side of the material to be rolled is provided with a roll that is lower than the work roll. A small-diameter work roll is pressed into contact with the work roll, and between the backing roll and the small-diameter work roll provided on the opposite side of the small-diameter work roll to the side that contacts the rolled material, there are provided at positions before and after the small-diameter work roll, respectively. Two intermediate rolls are provided so as to contact the backup roll and the small diameter work roll, and a device for bending the two intermediate rolls in the horizontal direction and a device for moving the two intermediate rolls alternately in the axial direction are provided. Characteristic rolling mill.