JPH0679731B2 - Support method for split type back-up plow for multi-high rolling mill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for supporting a split type backup roll for a multi-high rolling mill.

(Prior art) A split type backup roll supports a work roll that directly contributes to rolling from behind, transmits the rolling load to the work roll, and flexibly forcibly bends the work roll to flatten the surface of the material to be rolled. It is used to control the shape.

Fig. 5 is a side view of a 20-high rolling mill, in which 1 is a split type backup roll (hereinafter simply referred to as backup roll), 2 and 3 are intermediate rolls, 4 is work rolls, 5 and 6 are upper and lower housings. Reference numerals 7 and 7 denote columns, which perform rolling by applying a rolling load to the material 8 to be rolled through the roll groups 1, 2, 3, and 4 by elevating and lowering the upper housing 5 by a reduction device (not shown). is there.

As shown in FIG. 6, the backup roll 1 comprises a roll shaft 9 and a plurality of rollers 10 which are axially divided and fitted into the roll shaft 9. The backup roll 1 is provided between the rollers 10 and at both ends. The saddles 11 and 11a are supported by being attached to the housings 5 and 6. Of these saddles 11 and 11a, the saddles 11 located at both ends of the roll shaft 9 are housings.
Saddle 11a fixed to 5, 6 and located between rollers 10
Is attached so as to be movable in a direction perpendicular to the roll shaft 9. As a moving mechanism of the saddle 11a, there are, for example, a mechanism in which an eccentric ring is provided at the back of the saddle 11a and a swinging motion associated with the rotation is used, or a mechanism is moved by pushing a wedge, as will be described later.

Then, by appropriately moving the saddle 11a, as shown in FIG. 7, the backup roll 1 is subjected to a slight displacement so as to bend the work roll 4, thereby adjusting the crown of the work roll 4 and the planar shape of the material 8 to be rolled. To control.

(Problems to be Solved by the Invention) The support point of the backup roll 1 supported as described above, that is, the rigidity K of the saddle 11a (indicates the magnitude of displacement with respect to a load in the direction perpendicular to the roll axis, The rigidity K ₁ , K ₂ of the saddle 11a having the moving mechanism is usually smaller than the rigidity K _{3 of the} fixed saddle 11 because the moving mechanism is complicated. That is, the backup roll 1 is fixedly supported at both ends,
It is elastically supported in the middle.

The reaction force against the rolling load received by the work roll 4 from the material to be rolled 8 is transmitted to the backup roll 1 via the intermediate rolls 2 and 3, but the saddle 11a located in the intermediate portion of the backup roll 1 has the rigidity as described above. Because of the low elastic support state, the backup roll 1 is largely bent together with the work roll 4 and the intermediate rolls 2 and 3. 8th
The figure shows the deflection (δ) distribution of the work roll 4, showing a large deflection from the side edge to both sides of the material to be rolled 8 when viewed from the center of the plate, and this tendency becomes more remarkable as the rolling load (P) increases. Is shown. Therefore, the difference in the amount of deflection of the work roll 4 between the central portion and the side end portion of the rolled material 8 (Δ
δ) increases with the rolling load (P) as shown by the broken line A in FIG.

As described above, according to the conventional method for supporting the backup roll 1, since the difference in the amount of deflection of the work roll 4 between the plate central portion and the side end portion of the rolled material 8 is large, after the rolled material 8 is rolled. However, there is a problem that the surface shape becomes uneven and the surface shape changes due to a change in rolling load, which makes it difficult to control the shape.

The present invention has been made in view of such problems, and an object thereof is to provide a method for supporting a split type backup roll for a multi-high rolling mill, in which a change in rolling load has little influence on the surface shape of a material to be rolled. .

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a backup roll including a roll shaft and a plurality of rollers that are axially divided and fitted to the roll shaft. And supporting points are provided at both ends to support the central supporting point so that the rigidity in the direction perpendicular to the roll axis is maximized.

(Example) Next, one example of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross-sectional view of a 20-high rolling mill to which the method according to the present invention is applied, and the side view of FIG.

In Fig. 1, backup roll 1, intermediate rolls 2, 3,
The work roll 4, the upper and lower housings 5, 6 and the pillar 7 constitute a conventionally known 20-high rolling mill.

The backup roll 1 is disposed between both ends of the roll shaft 9 and the rollers 10, and is supported by saddles 11 and 11a attached to housings 5 and 6. These saddles
Of the 11, 11a, the two saddles 11 located in the center of the roll shaft 9 are fixed to the housings 5, 6 by tension bolts 12, and the two saddles 11a located on both sides are rolled by a well-known saddle moving mechanism described later. It is movable in a direction perpendicular to the shaft 9.

As shown in FIG. 2, the saddle moving mechanism includes an operating shaft 13
And bearings 14a, 14b, 14c and a saddle block 15.

The operation shaft 13 has a first small-diameter shaft portion 13a at one end, and an eccentric shaft portion 1 having a diameter smaller than that of the first small-diameter shaft portion 13a and eccentric from the shaft center by e.
3b and a second small-diameter shaft portion 13c having a diameter smaller than that of the eccentric shaft portion 13b and concentric with the first small-diameter shaft portion 13a. The second small-diameter shaft portion 13c is inserted into the housings 5 and 6 and can be rotated from the outside.

The bearings 14a and 14c are mounted on the first and second small diameter shaft portions 13a and 13c of the operating shaft 13, respectively, and rotatably support the operating shaft 13. The bearing 14b is mounted on the eccentric shaft portion 13b of the operation shaft 13, and a certain gap is provided between the outer ring and the housings 5 and 6.

The saddle block 15 is interposed between the bearing 14b and the saddle 11a, is fixed to the saddle 11a, and is slidable in the arrow direction in FIG. 2 together with the saddle 11a.

In this saddle moving mechanism, when the operating shaft 13 is rotated, the eccentric shaft portion 13b is eccentrically rotated by e with respect to the axial center of the operating shaft 13, and as a result, the saddle block 15 is moved through the bearing 14b in the direction of the arrow in FIG. Moved to and along with this saddle 11
a moves in a direction perpendicular to the roll shaft 9.

By supporting the backup roll 1 as described above, the rigidity K ₁ of the fixed saddle 11 is higher than the rigidity K ₂ , K _{3 of the} saddle 11a having the saddle moving mechanism.
As shown in FIG. 3, the backup roll 1 is fixedly supported in the central portion and elastically supported on both sides.

Therefore, even if the backup roll 1 receives a reaction force against the rolling load, the deflection amount is small as a whole because its central portion is fixed, and even if the rolling load changes, the variation in the deflection amount is small.

Therefore, with the 20-high rolling mill having the backup roll 1 supported by the method according to the present invention, the strip width is 500 mm.
When the rolled material 8 is rolled, as shown by the solid line C in FIG. 4, the difference in the amount of deflection of the work roll 4 between the plate central portion and the side end portion of the rolled material 8 with respect to changes in the rolling load (P). The fluctuation of (Δδ) is smaller than that of the conventional one shown by the broken line A. If all the saddles 11 and 11a are provided with a moving mechanism to have the same rigidity (K ₁ = K ₂ = K ₃ ), as shown by the solid line B in FIG. 4, the difference in the amount of deflection (Δδ) Is smaller than that of the conventional supporting method (broken line A), but is larger than that of the conventional supporting method (solid line C).

As described above, the difference (Δδ) in the amount of deflection of the work roll 4 between the plate central portion and the side end portion of the material to be rolled 8 is small, and as a result, there is little variation with respect to changes in the rolling load (P).
The planar shape of the material 4 to be rolled is made uniform.

The rigidity of the saddle 11a can be changed mainly by modifying the saddle moving mechanism. For example,
From the second small diameter shaft portion 13c of the operation shaft 13 to the eccentric shaft portion 13b, the first
If the small diameter shaft portion 13a is hollow, the rigidity is lowered, and if the length 1 of the eccentric shaft portion 13b is increased, the bending is increased and the rigidity is lowered.

(Effect of the invention) As is apparent from the above description, according to the present invention, the backup roll is supported so that the rigidity of the central support point among the respective support points of the backup roll is maximized, The deflection of the backup roll with respect to the load is small, and the variation of the deflection is small even if the rolling load changes, so the change in rolling load has less effect on the surface shape of the material to be rolled, and shape control becomes easier. Have an effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a 20-high rolling mill to which the method according to the present invention is applied, taken along the line II in FIG. 5, and FIG. 2 is II of FIG.
-II line cross-sectional view, FIG. 3 is a front view for explaining the support state of the backup roll, FIG. 4 is a diagram showing changes in the difference in the amount of deflection of the backup roll with respect to changes in the rolling load, and FIG. FIG. 6 is a side view of the rolling mill, FIG. 6 is a cross-sectional view of a 20-high rolling mill to which a conventional backup roll supporting method is applied in a II line portion in FIG. 5, and FIG. 7 is a front view illustrating a supporting state of a conventional backup roll , FIG. 8 is a diagram showing the deflection distribution of rolling load. 1 ... Backup roll, 9 ... Roll axis, 10 ... Roller, 11, 11a ... Saddle (support point).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-50106 (JP, A) JP-A-58-50107 (JP, A) JP-A-58-50116 (JP, A)

Claims (1)

[Claims] 1. A backup roll comprising a roll shaft and a plurality of rollers divided in the axial direction and fitted into the roll shaft,
Supporting points are provided between the rollers and at both ends, and the supporting points are supported so that the central supporting point of these supporting points has the maximum rigidity in the direction perpendicular to the roll axis. Backup roll support method.