JPH0118805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a strip rolling mill.

(Prior Art) A strip is a metal, a non-metal, or a composite thereof, and herein refers to a rollable band-like body of these metals.

Strips are mainly manufactured by being stretched using rolling mills. When manufacturing the strip by rolling, it is desirable to use small-diameter work rolls to achieve a large rolling reduction and to reduce the number of passes. Especially when producing ultra-thin strips,
The smaller the work roll diameter, the fewer passes can be made.

When using small-diameter work rolls, a back-up roll is required because the rolls are deflected by the rolling force. The conventionally known Sendzimir rolling mill is
It is the most commonly used rolling mill for ultra-thin strips, and has a complex structure in which two work rolls are supported by 18 back-up rolls.
The dimensional relationship between the work roll and the back-up rolls is subject to geometrical constraints, and in order to reduce the work roll diameter, the number of back-up rolls must be increased arithmetically.

As the number of stages of the back-up rolls increases, the amount of elastic deformation of the rolls accumulates, resulting in poor plate thickness accuracy and plate shape. In addition, the Sendzimir rolling mill has a complex structure, is expensive, and requires advanced technology to operate. U.S. Patent No. 2710550, U.S. Patent No. 2811060,
Each publication of British Patent No. 609706 shows a dual-drive planetary rolling mill, but since this rolling mill uses intermittent rolling in which the work rolls circulate, it produces significant noise and the strength of the work rolls. was weak and had many breakdowns.

Japanese Patent Application Laid-Open No. 58-35003 discloses a method in which one of the upper and lower work rolls is made smaller in diameter than the other work roll, and the small diameter work roll is offset in the rolling direction with respect to the other work roll.
A rolling mill is shown in which a presser roll, a dividing roll, and a horizontal bending device are arranged parallel to the small-diameter work roll on the offset side of the small-diameter work roll.

Since the purpose of this rolling mill is to control the plate thickness, the rolling mill is offset on the exit side with the intention of handling small diameter work rolls.
A rolling component force is generated toward the exit side, and this is received by the position control device on the exit side.

In such a rolling mill, the position of the small-diameter work roll fluctuates back and forth due to fluctuations in rolling load, making it difficult to make the small-diameter work roll an extremely small diameter.
In particular, in reciprocating rolling or so-called different circumferential speed rolling in which the circumferential speeds of upper and lower work rolls are different, this drawback is exacerbated and it is difficult to improve plate thickness accuracy and plate shape.

(Object of the Invention) The present invention provides a strip rolling mill capable of obtaining the effects of one-side roll drive, rolling with different diameter rolls, rolling with different circumferential speeds, and continuous rolling.

(Structure and operation of the invention) The present invention involves passing a strip in a U-shape between two large-diameter work rolls driven in the same direction and a non-driven small-diameter work roll arranged along the surface of the two large-diameter work rolls. A strip rolling mill equipped with a clamping device that clamps a small-diameter work roll, and two non-driven small-diameter work rolls stacked in the direction of the large-diameter work roll between two large-diameter work rolls driven in the same direction. This is a strip rolling mill equipped with a clamping device for rolling down the small diameter rolls.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows a rolling mill of the present invention in which there is one small-diameter work roll. A drive large-diameter work roll 1, a non-drive small-diameter work roll 31 that rolls the strip 2 together with the drive large-diameter work roll 1, and a drive large-diameter work roll 31 that supports the small-diameter work roll are housed in a roll housing that is similar to that of a known double or quadruple rolling mill. The diameter work rolls 3 are stacked on top of each other, and the small diameter work roll 31 is clamped by reinforcing rolls 5 and 6 from the front and back directions.

The large diameter work rolls 1 and 3 are driven in the same direction,
Since the small-diameter work roll 31 is not driven, it is freed from limitations on torsional rigidity, and the reinforcing roll 5,
Since the clamping pressure is held by 6, it is freed from the restriction of bending rigidity, so the diameter can be significantly reduced.
High pressure rolling becomes possible. Moreover, the rolling width is not restricted by reducing the diameter of the small-diameter work roll 31.

FIG. 2 shows a case where there are two small diameter work rolls. In this case as well, as in FIG. 1, a driven large-diameter work roll 1 and a non-driven small-diameter work roll 32 for rolling the strip 2 together with the driven large-diameter work roll 1 are housed in a roll housing substantially similar to a known double or quadruple rolling mill. , 33 and the driving large-diameter work roll 3 that supports the small-diameter work roll, and the small-diameter work rolls 32, 33 are supported from the front and back directions by reinforcing rolls 5, 6.
and clamped by second reinforcing rolls 7 and 8.

The small-diameter work rolls 32 and 33 are arranged along the surface of the large-diameter work rolls 1 and 3, and are not driven, so they are freed from limitations on torsional rigidity, and are sandwiched by reinforcing rolls 5, 6, 7, and 8. Since the pressure is maintained, it is freed from the restriction of bending rigidity, so the diameter can be significantly reduced, and high reduction rolling becomes possible. Furthermore, there is no restriction on the rolling width due to the reduction in the diameter of the small-diameter work roll.

Figure 3 shows the case where there are three small diameter work rolls, and the effect is the same as the case where there is one small diameter work roll in Figure 1 and the case where there are two small diameter work rolls in Figure 2. .

FIG. 4 shows an example in which two small-diameter work rolls are stacked in the direction of a large-diameter work roll. Publicly known 2
In a roll housing substantially similar to that of a heavy or quadruple rolling mill, there is a driven large-diameter work roll 1, non-driven small-diameter work rolls 32, 33 that roll the strip 2 together, and a driven large-diameter work roll that supports the small-diameter work rolls. The work rolls 3 are overlapped, and the small diameter work rolls 32 and 33 are attached to the reinforcing rolls 5 and 6 from the front and back directions.
and clamped by second reinforcing rolls 7 and 8.

Since the small-diameter work rolls 32 and 33 are not driven, they are freed from limitations on torsional rigidity, and because they are held under pressure by reinforcing rolls 5, 6, 7, and 8, they are freed from limitations on bending rigidity. , the diameter can be significantly reduced and rolling under high pressure becomes possible. Further, there is no restriction on the rolling width due to the reduction in the diameter of the small-diameter work roll.

FIG. 5 shows an example in which two small-diameter work rolls are stacked in the direction of a large-diameter work roll, and a medium-diameter work roll is placed alongside the small-diameter work roll along the surface of the large-diameter work roll. In this case as well, as in FIG. 4, a large-diameter drive work roll 1 and a strip 2 are placed in a roll housing that is similar to the known double or quadruple rolling mill.
The non-driven small-diameter work rolls 32, 33, the medium-diameter work roll 34, and the driven large-diameter work roll 3 are stacked as shown in the figure, and the small-diameter work rolls 32, 3 are rolled.
3 and a medium-diameter work roll 34 are clamped from the front and rear directions by reinforcing rolls 5 and 6.

Since the small-diameter work rolls 32, 33 and the medium-diameter work roll 34 are not driven, they are freed from limitations on torsional rigidity, and are held under clamping pressure by reinforcing rolls 5, 6 and 7, 8, so that bending is not possible. Since it is freed from restrictions on rigidity, the diameter can be significantly reduced and high reduction rolling becomes possible. Furthermore, there is no restriction on the rolling width due to the reduction in the diameter of the small-diameter work roll.

FIG. 6 shows a case where there are two small-diameter work rolls and one medium-diameter work roll, and the positions of the small-diameter work roll and the medium-diameter work roll are switched from those in FIG. 5. The effects of both are basically the same.

The small-diameter and medium-diameter work rolls shown in Figures 4 to 6 are all non-driven and are surrounded by a large-diameter roll and a reinforcing roll, so it is necessary to support the roll neck. Since there are no rolls, it is easy to change the arrangement of these rolls.

As in the present invention, by rolling the strip across a small-diameter work roll in a U-shape,
By rolling the strip at two locations on one small-diameter work roll, or by rolling the strip across a small-diameter work roll and a medium-diameter work roll in a U-shape, the number of rolling increases, and the number of rolling steps per pass increases. The amount of wall thickness reduction can be increased.

The rolling mill of the present invention can be a vertical rolling mill in which rolling rolls are stacked vertically like a conventional rolling mill, or a horizontal rolling mill in which rolling rolls are arranged horizontally. In the case of a vertical rolling mill, it is easier to load the strip into the mill in the direction of arrow A and extract it in the direction of arrow B.

In the case of a horizontal rolling mill, the work is easier if the rolling mill is charged in the direction A and extracted in the direction C. Further, it is desirable that the rolling mill of the present invention be operated with front tension and rear tension applied to the strip in the same manner as in conventional strip rolling mills.

(Effects of the Invention) As described above, by holding the small-diameter work roll under pressure with the reinforcing rolls, the diameter of the small-diameter work roll can be significantly reduced. In general, the influence of the work roll diameter on the rolling characteristics is that the work roll diameters on both sides of the material to be rolled are D ₁ and
If D ₂ , the equivalent roll diameter (=2D ₁ D ₂ / (D ₁
+D ₂ )) is being discussed as an indicator, and by reducing the diameter of one work roll, the equivalent roll diameter can be significantly reduced, the rolling load and rolling torque will be reduced, and high rolling reduction will be possible. .

For example, if D ₂ is set to 1/5 or 1/10 of D ₁ , the equivalent roll diameter becomes as small as 0.33D ₁ or 0.18D ₁ , respectively. The small diameter work roll clamping device can be easily added to a conventional double or quadruple rolling mill. Additionally, the roll sets shown in Figures 1 to 6 can be easily accommodated in the housing of a conventional double rolling mill or quadruple rolling mill, since the small diameter work rolls are not driven. Since it can be reused, it becomes an inexpensive rolling mill.

In addition, small-diameter work rolls are supported by large-diameter work rolls from the direction opposite to the rolling force, so their rigidity can be significantly increased, and as in the Sendzimir rolling mill, the elastic deformation of the rolls is accumulated and the plate thickness There is no deterioration in accuracy or plate shape.

Furthermore, small-diameter work rolls are not limited by geometrical size and are free from limitations on torsional and bending rigidity, so they can be significantly smaller in diameter and can be operated under high pressure. This rolling mill has one-side roll drive.
In addition to being able to obtain the effects of rolling with different diameter rolls or rolling with different circumferential speeds, by using a plurality of small diameter work rolls, the effect of continuous rolling can also be obtained.

[Brief explanation of drawings]

1 to 6 are side views of the rolling mill of the present invention. 1, 3: Large diameter work roll, 2: Strip,
5, 6, 7, 8: Reinforcement roll, 32, 33: Small diameter work roll, 34: Medium diameter work roll.

Claims (1)

[Scope of Claims] 1. A strip is wound in a U-shape between two large-diameter work rolls driven in the same direction and a non-driven small-diameter work roll arranged along the surface thereof. A strip strip comprising a clamping device that clamps a work roll in a direction perpendicular to the rolling direction of the large-diameter work roll, and the strip is wrapped around the strip so that the roll of the clamping device does not press the strip. rolling machine. 2. Two non-driven small-diameter work rolls are disposed along the surface of the two large-diameter work rolls that are driven in the same direction in a direction perpendicular to the rolling direction of the large-diameter work roll, and A clamping device is provided that clamps two non-driven small-diameter work rolls in a direction perpendicular to the rolling direction of the large-diameter work roll, and the strip is wrapped around the strip so that the rolls in the clamping device do not press the strip. A strip rolling machine consisting of: 3. Two non-driven small-diameter work rolls and one non-driven medium-diameter work roll are arranged between two large-diameter work rolls, and the strip is held so that the rolls in the clamping device do not press the strip. A strip rolling mill according to claim 2, which is constructed so as to be rolled around.