JPH0685926B2 - Rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention makes it possible to combine a plurality of types of work rolls of a multi-stage rolling mill having a pair of upper and lower work rolls and a reinforcing roll or an intermediate roll. The present invention relates to a rolling mill that is selectively used, and relates to a rolling mill that has a roll diameter correcting mechanism when a small-diameter roll is incorporated.

[Background of the Invention]

As a conventional rolling mill, as shown in Japanese Patent Publication No. 56-66307, it is a multi-stage rolling mill consisting of work rolls, intermediate rolls, and reinforcing rolls, axial movement of the intermediate rolls, roll bending of the work rolls, and intermediate rolls. The force is applied to control the shape of the rolled material. And the plate crown or shape of the entire rolled material plate width and the plate end can be controlled separately. However, in the conventional rolling mill that uses one type of work roll diameter, from soft rolled material to extremely hard high hardness special steel, the soft rolled material and hard rolled material can be efficiently It could not be rolled with work rolls of different diameters. Large-diameter work rolls, which enable high-speed rolling and less frequent roll change, are advantageous for efficient rolling of soft work materials, and small-diameter work rolls for rolling hard work materials. Otherwise, it cannot be rolled. For this reason, conventionally, a multi-high rolling mill with relatively large-diameter work rolls and a multi-high rolling mill with small-diameter work rolls were provided separately, but this is very uneconomical for high-mix low-volume production. It was.

As a rolling mill described in JP-A-52-16451,
Change to upper or lower working roll to meet predetermined conditions 2
There is one in which the small-diameter rolls of the book are configured to be compatible and function as an upper rolling mill. This rolling mill replaces the reduction cylinder, the pass line adjusting device, or the roll reassembling device during the reassembling work, which requires complicated work.

Japanese Unexamined Patent Publication No. 60-54213 discloses a technique for adjusting the pass line by inserting / removing the height adjusting piece 13, and is disclosed in Japanese Patent Publication No. 59-5042.
The publication discloses a technique of instructing a pass line adjusting packer on the insertion / removal replacement carriage 25 by interposing elastic means in the pressing direction. However, in any of the technologies, there is no description about how the height adjusting piece or the pass line adjusting packer corresponds to the axial force received from the reinforcing roll via the bearing box.

[Object of the Invention]

The present invention has been made under such circumstances, and an object of the present invention is to provide a rolling mill capable of efficiently rolling from a soft material to a hard material by the same machine.

[Outline of Invention]

In order to achieve such an object, the present invention is a multi-stage rolling mill in which different rolls having different reinforcing roll diameters (D) of 0.1D or more are rearranged and used according to the material to be rolled. A member for compensating for the difference in diameter with the caliber roll is placed on a device having elasticity in the axial direction of the roll under the lower reinforced roll bearing box and having elasticity in the vertical direction. It is characterized in that it is installed together with and the rolling pass line is adjusted.

Example of Invention

An embodiment of the rolling mill according to the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows a front view of a rolling mill. First, roll housings 1 and 2 are provided, and a lowering cylinder 5 and a ram 6 for exerting a rolling force are arranged below them. Further, wedges 33, 34 and stepped rocker plates 36, 37 are provided on the upper portion to provide a clearance for polishing each roll and a gap when the rolls are reassembled. The rolling rolls are composed of upper and lower reinforcing rolls 9 and 10, upper and lower intermediate rolls 15 and 16, and upper and lower work rolls 21 and 22 in multiple stages.

As shown in FIG. 3, this rolling mill is a multi-purpose rolling mill that uses large-diameter vertical work rolls 21 'and 22' and a small-diameter vertical work roll 21 and 22 shown in FIG. Composed of. When the work rolls have an extremely small diameter, when the intermediate rolls 15 and 16 are driven, the tangential force from the intermediate rolls causes the work rolls with a very small diameter to bend due to the force in the pass line direction, which reduces the quality of the rolled material. Therefore, the horizontal support rolls are arranged before and after the work rolls to suppress the deflection of the work rolls. However, as shown in FIGS. 3 and 4, in the case of a rolling mill configured to include a reinforcing roll, the diameter of the working roll is generally 0.1 times the diameter of the reinforcing roll or more, though it depends on the diameter of the reinforcing roll. As long as there is some roll rigidity, it is not necessary to provide a horizontal support roll.

In such a dual-use rolling mill, there is a large difference between the roll diameters when using a large-diameter roll and a small-diameter roll. Because I ca n’t
Lower correction block 49 between upper rocker plate 40 mounted on the lower surface of lower reinforced roll bearing box 13, 14 and rocker plate 8 arranged above rolling ram 6, and upper reinforced roll bearing box 11, An upper correction block 50 is required between the rocker plate 39 mounted on the upper surface of 12 and the stepped rocker plates 36, 37. In a multi-stage rolling mill that requires such a correction block, it is necessary to perform switching work of rolling mills using large to small diameter work rolls and small to large diameter work rolls in an extremely short time. It is necessary to combine the two with automation.

The first operation when a small-diameter work roll is installed in the rolling mill
It will be described with reference to the drawings. Since the small-diameter work rolls 21 and 22 are used, the upper correction block 50 and the lower correction block 49 are mounted, and the hydraulic pressure acts on the compression cylinder 5 located at the lower part, and the ram 6 in the cylinder, , And the lower correction block 49 is lifted from the dolly 51 via the rocker plate 8, and at the same time, a pushing force is applied to the lower reinforcing roll bearing boxes 13 and 14 and the lower rocker plate 40 to lower the lower reinforcing roll 10. Through the lower intermediate roll-16, the lower work roll 22, the upper work roll 21, the upper intermediate roll 15, and the upper reinforcing roll 9 through the rocker plate 39, the upper correction block 50, the stepped rocker plates 36, 37, the wedge 33, 34, the rocker plates 31, 32, and the roll housings 1, 2 are reached to exert a rolling down force. When the rolls are reassembled, the ram 6 is lowered to the lowermost end. At this time, the lower reinforcing roll 10 is moved to the lower correction block 4 via the lower reinforcing roll bearing boxes 13 and 14 and the rocker plate 40.
While riding on 9, descend to the lowest end of the cylinder end. Therefore, the lower correction block 49 and the loading / unloading carriage 51 are in a state of being crimped.

On the other hand, when the correction block is carried in and out, the upper and lower reinforcing rolls are usually assembled in the rolling mill, so that the upper rocker plate 8 of the ram 6 and the lower reinforcing roll are installed as shown in FIG. Rocker plate 4 under the roll bearing box
A gap must be provided between the upper and lower surfaces of 0 and the lower correction block 49. Therefore, a device for changing the reinforcing roll is prepared. The rail lifting cylinder 44, the push-up rod 45, the reinforcing roll inner rail 46, and the like incorporated in the lower separator 4 form a pushing gap through the reinforcing roll wheel 69. At this time, the rail rising end is at the same level as the fixed rail 42 provided outside the rolling mill.

The lower correction block 49 is carried in and out and switched after the above gap is created. The loading / unloading carriage 51 of the lower correction block 49 is
A spring 55 extending vertically to the wheel holder 54 of the dolly 51.
Elastically held by wheels 53 coupled through
Lower correction block Cylinders 56, 62 for moving in / out, trolley 57, wheels 6
0, 61, hooks 52, rods 58, springs 59, rails 63, 64 attached to the compression cylinder, fixed rails 42, outer rails 43, 48 attached to the frame 47, etc. To be done.

Further, when the lower reinforcing roll 10 is moved up and down by the reinforcing roll reassembling rail 46 and when the rolling down ram 6 is lowered from the rolling state, movement in the roll axial direction and rotation of the ram 6 occur.
Since those movements act on the lower correction block 49, the lower correction block carriage 51 must follow the movement of the lower correction block 49.

In this embodiment, the lower reinforcing roll assembly bears the weight of the lower reinforcing roll assembly by the spring 55 between the carriage and the wheel with respect to the lowering of the lower reinforcing roll assembly when the roll is opened. When pushed up, the lower correction block 49 is lifted by the restoring force of the spring 55 between the dolly of the correction block carry-out dolly and the wheels to form a gap between the ram 6 and the upper rocker plate.

Further, even when the lower reinforcing roll assembly moves in the roll axial direction, the carriage loading / unloading cylinders 56, 62, the rod 58, the spring on the side,
59, the inside of the rolling mill has rods 63 and 64 incorporated into the rod 65,
The spring 66 acts to follow the movement of the lower correction block 49 without causing an unreasonable force, and the carriage 51 can be moved to enable rolling with the unloading device of the lower correction block installed. Therefore, the switching work of large-diameter rolls can be performed very easily.

In roll driving, a work roll driving method is used when a large-diameter work roll is used, and an intermediate roll driving method is used when a small-diameter work roll is used.

〔The invention's effect〕

According to the present embodiment described above, the roll diameter correction block is loaded into the rolling mill with the reinforcing roll incorporated in the rolling mill,
Since it can be carried out, it is possible to switch between a rolling mill using a work roll with a large diameter and a rolling mill using a work roll with a large diameter in a short time. Therefore, this device can improve the efficiency as a multi-stage rolling mill.

When the reinforcing roll descends to the lowermost end, they descend against the elastic force of the spring and can be restored when the reinforcing roll is pushed up. Therefore, the correction block carry-in / out can be automated by this device. In addition, rolling can be performed with the loading / unloading device installed in the rolling mill, and rolls can be changed. Therefore, it is possible to use a roll changing device with both small and large diameters. By providing only the jig for caliber work roll reshuffling as an accessory, automated reshuffling becomes possible.

As described above, according to the rolling mill of the present invention, it is possible to efficiently roll from a soft material to a hard material by the same mill.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a rolling mill according to the present invention,
FIG. 2 is a side view of the rolling mill shown in FIG. 1, and FIGS. 3 and 4 are sectional views showing roll recombination of the rolling mill shown in FIG. 1 ... Roll housing, 2 ... Roll housing, 5
…… Cylinder, 6 …… Ram, 8 …… Rocker seat,
9,10 …… Reinforcing rolls, 15,16 …… Intermediate rolls, 21,22 ……
Work rolls, 31,32 …… rocker plate, 33,34 …… wedge, 36, 37 …… stepped rocker plate, 39 …… rocker plate, 40 …… rocker plate, 49 …… lower correction block, 50 …… Upper correction block, 51 …… carriage, 53 …… wheels, 55,59,66 …… springs.

Claims (1)

[Claims] 1. A multi-stage rolling mill in which rolls having different reinforcing roll diameters (D) of 0.1D or more are selectively used in combination according to the material to be rolled, and when the small-diameter roll is used, the difference in diameter from the large-diameter roll is corrected. The member to be rolled is loaded on a device which is located below the lower reinforced roll bearing box, is held by a member having elasticity in the roll axial direction, and has elasticity in the vertical direction. A rolling mill characterized by adjusting.