JP2798230B2 - 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 a cross roll rolling machine suitable for cold rolling, such as a pair cross roll rolling mill and a work roll cross rolling mill.

[0002]

2. Description of the Related Art FIG. 6 is a side view showing a first example of a conventional cross roll rolling method, in which a rolling method using a cross roll rolling machine is shown. FIG. 7 is a plan view showing only the upper and lower work rolls of FIG. .

As shown in FIGS. 6 and 7, an upper work roll 11 and an upper backup roll 13, and a lower work roll 12 and a lower backup roll 14 are rolled by upper and lower roll cross devices (not shown). The strip 10 is rolled by crossing at a required upper cross angle θ1 and a lower cross angle θ2 with respect to the plate width direction center line C orthogonal to the direction center line P, respectively. During rolling, upper work roll 1
1 and the upper cross angle θ1 of the upper backup roll 13;
The lower cross angle θ2 of the lower work roll 12 and the lower backup roll 14 is adjusted by the respective roll cross devices, and the crown of the upper and lower work rolls 11 and 12 is controlled.

FIG. 8 shows a second example of the conventional cross roll rolling method.
FIG. 7 is a side view showing a rolling method using a work roll cross rolling mill as an example, and a plan view showing only upper and lower work rolls is the same as FIG.

[0005] This rolling method comprises upper and lower work rolls 11,
The belt material 10 is rolled by crossing only 12 at the required upper cross angle θ1 and lower cross angle θ2 by upper and lower roll cross devices (not shown). During rolling, the upper cross angle θ1 of the upper work roll 11 and the lower work roll 12
Is adjusted to control the crown of the upper and lower work rolls 11 and 12.

[0006]

In the cold rolling of the strip 10, for example, as shown in FIG. 7, if the roughness of the barrel of the lower work roll 12 is larger than the roughness of the upper work roll 11, as shown in FIG. The lower frictional force F2 of the lower work roll 12 with the strip 10 is greater than the upper frictional force F1 of the upper work roll 11 with the strip 10, and the lower thrust S2 is also greater than the upper thrust S1. .

For this reason, if there is a slight partial difference in the roughness between the upper work roll 11 and the lower work roll 12,
The magnitude relationship between the upper frictional force F1 and the lower frictional force F2 is not constant. Therefore, the magnitude relationship between the vertical thrust forces S1 and S2 is not stable, and the direction of the force is not stable. Therefore, the mutual positions of the upper and lower work rolls 11 and 12 and the strip 10 in the roll axis direction are not stable, and for example, a shape defect such as one-sided stretching may occur.

The present invention has been proposed to solve such a problem, and it is possible to stabilize the mutual positions of the upper and lower work rolls and the strip in the roll axis direction and to roll a high-quality strip. It is an object to provide a possible cross roll rolling mill.

[0009]

A cross-roll rolling mill according to the present invention for solving the above-mentioned problems is as follows. (1) In a cross roll rolling mill that rolls a strip by crossing an upper work roll and an upper backup roll with a lower work roll and a lower backup roll at a required cross angle, the barrel of one of the upper and lower work rolls The roughness of the part is smaller than the roughness of the barrel part of the other work roll, the other work roll having a large roughness and the cross angle of the backup roll thereof are reduced to 0 ° or minute, and the one work roll and the The cross angle of the backup roll is set to be larger than the cross angle of the other work roll and its backup roll.

(2) In a cross roll rolling mill for rolling a strip by crossing only an upper work roll and a lower work roll at a required cross angle, the roughness of the barrel portion of one of the upper and lower work rolls is determined. The cross-angle of the other work roll having a large roughness is set to 0 ° or minute, and the cross angle of the one work roll is set to be smaller than the roughness of the barrel portion of the other work roll. It is characterized in that it is set larger than the cross angle of the backup roll.

(3) The upper work roll and the lower work roll have different barrel roughnesses, and the low-work roughness work roll is crossed with the high-work roughness work roll at a predetermined cross angle. It is characterized by becoming.

[0012]

According to the cross roll rolling mill having the above-described structure, the frictional force between the work roll having a large roughness in one of the upper and lower directions and the strip is increased.

On the other hand, the frictional force between the other work roll having a small roughness and the band material becomes very small, and the small thrust force generated by the cross angle for which the roll crown can be controlled is reduced by the work roll having a large roughness. , And the mutual position of the work roll and the strip in the roll axis direction is stabilized.

[0014]

FIG. 1 is a side view showing a cold rolling method of a pair cross roll rolling mill according to a first embodiment of the present invention, and FIG. 2 is a plan view showing only the upper and lower work rolls of FIG.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a work roll for cold use, for example, in which the barrel has a roughness of 0.01.
The upper work roll has a small roughness of about 0.2 μm Ra and has a required upper cross angle θ1 with respect to a center line C in the sheet width direction orthogonal to the center line P in the rolling direction together with the upper backup roll 13 by a roll cross device of a rolling mill (not shown). It is designed to cross. 2 is, for example, in the case of a cold work roll, its barrel has a roughness of 0.2 to 0.5 μm Ra.
The lower work roll has a large roughness, and is crossed with a lower backup roll 14 at a required lower cross angle θ2 with respect to the center line C in the plate width direction by a roll cross device of a rolling mill (not shown). The roughness of a conventional conventional work roll is about 0.3 μmRa.

Next, the operation of the present apparatus will be described. The upper work roll 1 and the upper backup roll 13 are crossed at an upper cross angle θ1, and
And the lower backup roll 14 sets the lower cross angle θ2 to 0 °.
Is rolled. During rolling, the roll crown is controlled while adjusting the upper cross angle θ1 of the upper work roll 1 with small roughness. At this time, the upper frictional force F1 and the upper thrust force S1 are small and always satisfy S1 ≦ S2. The position stabilizes.

Depending on the material of the strip 10 being rolled and the condition of the front and back surfaces, the lower work roll 2 with large roughness may be crossed by a small lower cross angle θ.

FIG. 3 is a side view showing a cold rolling method of a work roll cloth rolling machine according to a second embodiment of the present invention, and a plan view showing only upper and lower work rolls is the same as FIG. Omitted.

This work roll cloth rolling mill uses a work roll 1 having a small roughness and a work roll 2 having a large roughness as in the first embodiment. Only the lower work roll 2 is crossed at the upper cross angle θ1 and the lower cross angle θ2.

The upper work roll 1 having a small roughness and the lower work roll 2 having a large roughness are crossed in the same manner as in the first embodiment, and the roll crown is controlled while adjusting the upper cross angle θ1 of the small roughness upper work roll 1. Then, the strip 10 is rolled.

FIG. 4 is a side view showing a cold rolling method for a work roll cloth rolling mill according to a third embodiment of the present invention.
FIG. 5 is a plan view showing only upper and lower work rolls of FIG. 4.

This work roll cloth rolling mill uses a work roll 1 having a small roughness and a work roll 2 having a large roughness as in the first and second embodiments. Only roll 1 is crossed at upper cross angle θ1,
Only the lower roughness work roll 2 is crossed at a small lower cross angle θ2, and the strip 10 is rolled.

In each of the first, second and third embodiments described above, a lower work roll having a small roughness and an upper work roll having a large roughness are used, and the cross angle of the lower work roll is used. Can be adjusted to control the roll crown, but during normal rolling, coolant is sprayed on the front and back surfaces of the strip, but the back surface has less adhesion of the coolant compared to the front and frictional force with the lower work roll Therefore, it is reasonable that the lower work roll has a large roughness as in the above embodiments. If the cross angle of one of the work rolls is fixed at 0 °, a structure in which only the cross angle of the other work roll is changed is sufficient, and the cost reduction effect of the apparatus can be obtained, which is preferable.

[0024]

As described above, according to the present invention, the roughness of the barrel of one of the upper and lower work rolls is made smaller than the roughness of the barrel of the other work roll, and Rolling the strip with a large work roll with a cross angle of 0 ° or minute and a work roll with a small roughness on the other hand with a cross angle that allows control of the roll crown, thereby reducing the roughness and the frictional force. The small thrust force generated from the one work roll can always be made smaller than the thrust force of the other work roll. Therefore, since the magnitude relationship between the upper and lower thrust forces is stable, the mutual position of the upper and lower work rolls and the strip in the roll axis direction can be stabilized. be able to.

[Brief description of the drawings]

FIG. 1 is a side view showing a rolling method of a pair cross roll rolling mill according to a first embodiment of the present invention.

FIG. 2 is a plan view showing only upper and lower work rolls of FIG.

FIG. 3 is a side view showing a rolling method of a work roll cloth rolling machine according to a second embodiment of the present invention.

FIG. 4 is a side view showing a rolling method of a work roll cloth rolling mill according to a third embodiment of the present invention.

FIG. 5 is a plan view showing only upper and lower work rolls of FIG. 4;

FIG. 6 is a first example of a conventional cross roll rolling method;
It is a side view which shows the rolling method by a pair cross roll rolling mill.

FIG. 7 is a plan view showing only upper and lower work rolls of FIG. 6;

FIG. 8 is a second example of a conventional cross roll rolling method;
It is a side view which shows the rolling method by a work roll cross rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small roughness upper work roll 2 Large roughness upper work roll 10 Strip 13 Upper backup roll 14 Lower backup roll F1 Upper friction force F2 Lower friction force S1 Upper thrust force S2 Lower thrust force θ1 Upper cross angle θ2 Lower cross angle

Continuation of the front page (72) Inventor Hiroshi Matsuda 4--22 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Kazuhiko Horie 4-622 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima No. Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Toshiya Oi 4-33, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Inside Sumitomo Metal Industries, Ltd. (72) Inventor Fumio Nishimura Kashima-cho, Kashima-gun, Ibaraki Prefecture Address Sumitomo Metal Industries, Ltd., Kashima Works (72) Inventor Toru Kaneko 3rd, Kajima-cho, Kashima-gun, Ibaraki Prefecture Sumitomo Metal Industries, Ltd., Kashima Works, (72) Inventor Takehiko Matsushige, Kashima-cho, Kashima-gun, Ibaraki Address Sumitomo Metal Industries Co., Ltd. Kashima Works (58) Field surveyed (Int. Cl. ⁶ , DB name) B21B 1 / 22,13 / 14,31 / 16

Claims (5)

(57) [Claims] 1. A cross roll rolling mill for rolling a strip by crossing an upper work roll and an upper backup roll with a lower work roll and a lower backup roll at a required cross angle, wherein the one of the upper and lower work rolls is provided. The roughness of the barrel part of the other work roll is made smaller than the roughness of the barrel part of the other work roll, the cross roll angle of the other work roll with large roughness and its backup roll is reduced to 0 ° or minute, and the one work roll And a cross angle of the backup roll is set larger than a cross angle of the other work roll and the backup roll. 2. A cross roll rolling mill for rolling a strip by crossing only an upper work roll and a lower work roll at a required cross angle, wherein the roughness of the barrel portion of one of the upper and lower work rolls is set to the other. , The cross angle of the other work roll having a large roughness is set to 0 ° or minute, and the cross angle of the one work roll is set to the other work roll and its backup. A cross roll rolling mill characterized in that the cross angle is set to be larger than the cross angle of the roll. 3. The work roll having a small roughness is made to cross a work roll having a large roughness at a predetermined cross angle by making the roughness of the barrel portions of the upper work roll and the lower work roll different from each other. A cross-roll rolling mill, comprising: 4. A work roll having a large roughness has a cross angle of zero.
5. The cross-roll rolling mill according to claim 1, wherein the cross-roll rolling machine is fixed at an angle of?. 5. The cross roll rolling mill according to claim 1, wherein the work roll having a large roughness is a lower work roll.