JPS649081B2 - - 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 increase the reduction ratio and reduce the number of passes. Particularly 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 most commonly used for rolling 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 back-up roll is
If the work roll diameter is to be reduced due to geometric constraints, 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 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, split rolls 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, it is offset to the exit side for small diameter work rolls, and for small diameter work rolls, a rolling component force is generated toward the exit side, It 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 further aggravated, and it is difficult to improve plate thickness accuracy and plate shape.

(Object of the invention) The present invention provides one-sided roll drive, different diameter roll rolling,
Another object of the present invention is to provide a strip rolling mill that can achieve effects such as rolling at 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 driven in opposite directions, the rotational axis of which is approximately the same as the rotational axis of the driven work roll. A strip rolling machine arranged in the same plane and pinching the small diameter work rolls with reinforcing rolls; and a strip rolling machine in which the small diameter work rolls are pinched with reinforcing shoes. be.

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 first driven large-diameter roll 1, a first non-driven small-diameter work roll 31 for rolling the strip 2 together with the first driven large-diameter roll 1, and a second non-driven small-diameter work roll 31 are provided in a roll housing substantially similar to a known double or quadruple rolling mill. The non-driven small-diameter work roll 32 and the second driven large-diameter work roll 4 are arranged one on top of the other in this order. The rotation axes of the two small-diameter work rolls are aligned in substantially the same plane as the rotation axis of the large-diameter work roll, and the two large-diameter work rolls are driven in opposite directions.

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

The reinforcing rolls are second reinforcing rolls 7, 8, 7
1, 81, and is preferably supported by a plurality of rolling down devices 9, 10, 11, 12 which can be divided in the length direction of the roll and whose positions can be controlled independently. 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. 1 and 2 differ only in the number of reinforcing devices, but the effect is the same. Reinforcement rolls 52, 62
Two small diameter work rolls 3 with different rotation directions
1 and 32 at the same time, the direction of rotation of the reinforcing roll is 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 are each independently pinched and positioned by reinforcing shoes 51, 61, 53, and 63 from a direction different from that of the large-diameter work rolls, that is, from the front and rear directions of the rolls.

The reinforcing shoe is divided in the length direction of the roll and has a plurality of rolling down devices 9, 1 whose positions can be controlled independently.
0, 11, and 12. 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. Figures 3 and 4 differ only in the number of reinforcing devices.
The effect is the same. Reinforcement shoe holes 52, 62,
High-pressure fluid is ejected from 53 and 63 toward the small-diameter work roll to reduce friction on the small-diameter work roll support portion. 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 reinforcing shoe, the diameter of the small-diameter work roll can be significantly reduced.

In general, the influence of work roll diameter on rolling characteristics is determined by setting the work roll diameters on both sides of the material to be rolled by D ₁
and D ₂ , the equivalent roll diameter (=2D ₁ D ₂ /
(D ₁ + D ₂ )) is discussed as an index, 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. It becomes possible.

For example, if D ₂ is set to 1/5 or 1/10 of D ₁ , the equivalent roll diameter becomes 0.33D ₁ or 0.18D ₁ , respectively. The small diameter work roll clamping device can be easily added to a conventional double rolling mill or quadruple rolling mill.

In addition, in the roll sets shown in Figs. 1 to 4, since the small diameter work rolls are not driven,
It can be easily accommodated in the housing of a conventional double or quadruple rolling mill, and the conventional rolling mill can be used, resulting in an inexpensive rolling mill.

In addition, since the small diameter work roll is supported by the large diameter work roll from the direction opposite to the rolling force,
The rigidity can be significantly increased, and unlike the Sendzimir rolling mill, elastic deformation of the rolls will not accumulate and the plate thickness accuracy and plate shape will not deteriorate. Furthermore, small diameter work rolls are not constrained by geometric size and are freed from limitations on torsional and bending stiffness.
It can be made 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. 1, 4: Large diameter work roll, 2: Strip,
5, 6: Reinforcement roll, 9, 10, 11, 12: Nipping device, 31, 32: Small diameter work roll, 5
1,61: Reinforcement shoe.

Claims (1)

[Claims] 1. Two non-driven small-diameter work rolls are placed between two large-diameter work rolls driven in opposite directions, with their rotational axes being approximately in the same plane as the rotational axis of the driving work rolls. 1. A strip rolling mill characterized in that the small-diameter work rolls are arranged in accordance with the invention, and the small-diameter work rolls are compressed by reinforcing rolls. 2. Two non-driven small-diameter work rolls are arranged between two large-diameter work rolls driven in opposite directions, with their rotational axes aligned in substantially the same plane as the rotational axis of the driving work rolls. A strip rolling mill characterized in that the small-diameter work rolls are compressed by reinforcing shoes.