JPS6120603A - Strip rolling mill - Google Patents

Abstract

PURPOSE:To decrease considerably the diameter of small-diameter work rolls and to obtain an effect of roll driving on one side, rolling with different-diameter rolls or rolling at different peripheral speeds by grasping and holding the small- diameter work rolls under the pressure by reinforcing rolls. CONSTITUTION:A strip 2 is extended into an S shape between the 1st large- diameter work roll 1 and the 1st small-diameter work roll 31, between the 1st small-diameter work roll 31 and the 2nd small diameter work roll 32 and between the 2nd small-diameter roll 32 and the 2nd large-diameter work roll 4. The non-driven small-diameter work rolls are respectively independently grasped under the pressure and positioned by the reinforcing rolls 5, 6, 51, 61 from the directions different from the large-diameter work roll, i.e., from the front and rear directions of the rolls.

Description

[Detailed description of the invention] (Industrial application field) What is the invention? This relates to a trip rolling mill.

(Prior Art) A strip is a metal, a non-metal, or a composite thereof, and herein, a rollable strip of these materials is collectively referred to.

Strips are mainly manufactured by being stretched using a rolling mill. When manufacturing strips by rolling, small-diameter work rolls are used to achieve a large rolling reduction.
It is desirable to reduce the number of passes. Particularly when manufacturing ultra-thin strips, the smaller the work roll diameter, the fewer passes can be made.

When using small-diameter work row 2, a backup roll is required because the roll is deflected by the rolling force. The conventionally known Sendzimir rolling mill is most commonly used as a rolling mill for ultra-thin strips, and has a complex structure in which two work rolls are supported by 18 backup rolls.

The dimensional relationship between the work roll and the backup roll is subject to geometrical constraints, and in order to reduce the diameter of the work roll, the number of backup rolls must be increased in equal numbers.

As the number of stages of backup 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 complicated structure and is expensive.
Operation requires advanced technology. US Patent No. 2'71
No. 0550, No. 2811060, British Patent No. 609
Each publication of No. 706 shows a double-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 is weak. There were many breakdowns.

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

Since the purpose of this rolling mill is to control the plate thickness, the rolls are offset toward the exit side with the intention of producing small diameter work rolls.
For small-diameter work rolls, a rolling component force is generated toward the exit side, and this is stopped by a 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 the rolling load, making it difficult to make the small-diameter work roll an extremely small diameter.

This drawback is exacerbated especially in reciprocating rolling and so-called different circumferential speed rolling in which the circumferential speeds of the upper and lower work rolls are different.
It is difficult to improve plate thickness accuracy and plate shape.

(Object of the Invention) The present invention provides a strip rolling mill that can achieve effects such as one-side roll drive, rolling with different diameter rolls, or rolling with different circumferential speeds.

(Structure and operation of the invention) The present invention provides two non-driven small-diameter work rolls between two large-diameter work rolls that are driven in opposite directions, with their rotational axes in substantially the same plane as the driving work rolls. The present invention provides a strip rolling mill in which the small-diameter work rolls are pinched by reinforcing rolls, and a strip rolling mill in which the small-diameter work rolls are pinched by reinforcing 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 are two sets of reinforcing rolls. A known double or quadruple rolling mill,
In a similar roll housing, a first driven large-diameter roll 1, a first non-driven small-diameter work roll 31 with which the strip 2 is rolled, and a second non-driven small-diameter work roll 32; The second driven large-diameter work rolls 4 are arranged one on top of the other in this order. The rotation axes of the two small-diameter work rolls are arranged in the same plane as the large-diameter work roll, and the two large-diameter work rolls are driven in opposite directions.

The strip 2 is arranged between a first large-diameter work roll and a first small-diameter work roll, between a first small-diameter work roll and a second small-diameter work roll, and between a second small-diameter work roll and a second large-diameter work roll. It stretches in an S-shape between them. The non-driven small-diameter work rolls are each independently pressed and positioned by reinforcing rolls 5,6,51,61 from a different direction from the large-diameter work rolls, that is, from the front and rear directions of the rolls.

The reinforcing roll is a second reinforcing roll (7, 8, '71°8
9.10.11.12 A plurality of rolling down devices reinforced by 1, divided along the length of the roll and whose position can be controlled independently.
It is desirable that it be supported by

As the reduction device, a hydraulic cylinder or a reduction screw is recommended.

FIG. 2 shows a case where there is one set of reinforcing rolls. 1st
The difference between this figure and FIG. 2 is only the number of reinforcing devices, but the effect is the same. The reinforcing rolls 52 and 62 have two different rotation directions.
When the book small diameter work rolls 3 and 32 touch at the same time,
The reinforcing roll rotates in the same direction as the strip at the position where it contacts the strip.

FIG. 3 shows a rolling mill according to another embodiment of the present invention, in which there are two sets of reinforcing shoes. The non-driven small-diameter work rolls can be moved independently from the large-diameter work rolls in different directions.
That is, from the front and back direction of the roll, the reinforcing shoe 51.61
．． 53 and 63 and are positioned.

The reinforcing shoe is divided in the length direction of the roll and has multiple rolling down devices whose positions can be controlled independently9.10.11.12
It is desirable that it be supported by

The reduction device is preferably a hydraulic cylinder or a reduction screw.

FIG. 4 shows a rolling mill according to yet another embodiment of the present invention, in which there is one set of reinforcing shoes. 3 and 4 differ only in the number of reinforcing devices, but the effect is the same. High-pressure fluid is injected from the holes 52, 62, 53, and 63 of the reinforcing shoe toward the small-diameter work roll, reducing the friction of the small-diameter work roll support. By using high-pressure fluid as a rolling lubricant, good rolling can be achieved and roll wear can be reduced.

(Effects of the Invention) As described above, by holding the small-diameter work roll under pressure with the reinforcing roll or the reinforcing shoe, 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 as follows: If the work roll diameters on both sides of the material to be rolled are Dl and D2, then the threshold roll diameter (-2D1D2/(DI+D2)
), and by reducing the diameter of one of the work rolls, the equivalent roll diameter can be significantly reduced, rolling load and rolling torque are reduced, and high rolling reduction is possible.

For example, if D2 is 115 or 1/10 of Dl, the equivalent roll diameter is 0.33 Dl or 0.18 D1, respectively.
becomes smaller. The small diameter work roll clamping device is
It can be easily added to a heavy rolling mill or a quadruple rolling mill.

In addition, since the roll sets shown in Figures 1 to 4 do not have a drive for small-diameter work rolls, they can be easily accommodated in the housing of a conventional double rolling mill or quadruple rolling mill. Since the machine can be reused, it becomes an inexpensive rolling mill.

In addition, since small-diameter work rolls are supported by large-diameter work rolls from the direction opposite to the rolling force, their rigidity can be significantly increased, and as in the Sendzimir rolling mill, elastic deformation of the rolls accumulates, resulting in poor plate thickness accuracy. The shape of the plate will not deteriorate.

Furthermore, small-diameter work rolls are not limited by geometrical size and are freed from limitations on torsional and bending rigidity, so they can be significantly smaller in diameter and can be operated under high pressure.

Therefore, this rolling mill can achieve effects such as one-side roll drive, rolling with different diameter rolls, and rolling with different circumferential speeds. Furthermore, the housing of a conventional double rolling mill or quadruple rolling mill can be used, and small-diameter work rolls can be held and high-rigidity rolling and high-reduction rolling can be performed both in a reciprocating manner, resulting in great industrial effects.

[Brief explanation of the drawing]

1 to 4 are side views of the rolling mill of the present invention. ■, 4: Large diameter work roll 2-nist strip 5.6:
Reinforcement roll 9.10.11.12: Pressure upper device 31.32: Small diameter work roll 51.61: Reinforcement shoe Fig. 1 Fig. 2

Claims (1)

[Claims] 1. Between two large diameter work rolls driven in opposite directions,
Two non-driven small-diameter work rolls are arranged with their rotational axes aligned in substantially the same plane as the driven work roll,
A strip rolling mill characterized in that the small-diameter work roll is compressed by reinforcing rolls. 2 Between two large-diameter work rolls driven in opposite directions,
Two non-driven small-diameter work rolls are arranged with their rotational axes aligned in substantially the same plane as the driven work roll,
A strip rolling machine characterized in that the small-diameter work roll is compressed by reinforcing shoes.