JPH0829334B2 - Rolling mill - Google Patents

Description

The present invention relates to a rolling mill, and more particularly to a rolling mill suitable for rolling H-section steel.

[Conventional technology]

In order to reduce the equipment cost in equipment for producing a wide variety of rolled products, a method has been adopted in which rolls and chocks are exchanged and rolled in accordance with ductile products of the rolling mill by one rolling mill. That is, for wide plate rolling, quadruple horizontal rolls and chocks are incorporated into a mill stand and rolled, and for rolling round bars and the like, double horizontal rolls and chocks are incorporated into a mill stand and rolled.

On the other hand, when H-section steel is rolled, the upper and lower horizontal rolls and chocks, vertical rolls (hereinafter referred to as V rolls) and chocks are incorporated and rolled. In order to support the rolling load acting on the V roll during the rolling of the H-section steel, a mill housing of a system in which a door incorporating a horizontal roll mill housing V rolling screw is attached to the operating side and the driving side is used. A proposal disclosed in Japanese Patent Publication No. 48-24948 is known as a rolling mill of this type.

However, according to the rolling mill proposed above, when performing the work of exchanging various rolls, the V attached to the operating side is used.
There was a drawback in that the operation was unsatisfactory because it required the operation of opening the pressing door to allow the chock to move in and out freely. Furthermore, after exchanging the horizontal roll and the V roll, it is necessary to perform high-precision fine adjustment with respect to each roll position after each roll is installed in the housing. There is also a problem that workability is extremely poor.

In order to solve the above-mentioned problems, when performing double rolling or quadruple rolling, rolling is performed by incorporating each roll into a mill housing that is usually used, and when rolling H-shaped steel, the rolling is performed in the mill housing. An inner stand that can be independently put in and taken out is provided, and a horizontal roll and a V roll assembly and a V roll reduction device are integrally incorporated in the inner stand for rolling. As this method, the proposal disclosed in Japanese Examined Patent Publication No. 45-34687 is known. By doing so, efficient rolling becomes possible.

On the other hand, in the inner stand that can move in and out of the mill housing, each operating part needs to be hydraulically driven for labor saving and automation. However, in order to supply pressure oil to each hydraulic drive unit of the inner stand, which is a movable member, it is necessary to connect and disconnect the pipes, which hinders labor saving and automation.

As a proposal for solving this problem, Japanese Patent Publication No. 45-3
As disclosed by Japanese Patent No. 4687, there is known a proposal in which a hydraulic cylinder for lifting an upper horizontal roll is attached to a mill housing, and the upper horizontal roll chock assembly is configured to hold and lift a suspended long beam by the hydraulic cylinder. ing.

[Problems to be solved by the invention]

According to the above-mentioned prior art, when the upper horizontal roll balance beam incorporated in the inner stand is connected to the cylinder attached to the mill housing in the mill housing, the beam is housed when the inner stand is pulled out. Since it always remains in the upper part of the inside, when using a roll other than H-shaped steel rolling, for example, a quadruple rolling chock incorporated in the mill housing, this unnecessary beam hinders the operation of the quadruple rolling. There was a problem of becoming.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rolling mill capable of easily changing rolls and capable of producing a wide variety of rolled products with good operability.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a rolling mill in which an inner stand having upper and lower horizontal roll assemblies and vertical roll assemblies is integrally provided in a mill housing so as to be insertable and withdrawable. A roll balance cylinder for holding the upper horizontal roll upward is fixed to the mill housing, and during the rolling, the drive side of the carrier,
A gap is formed with an arm extending upward on both the operating side, and an arm that can be engaged with the cylinder via the locking member is provided in the inner stand when the inner stand is inserted and withdrawn. It is configured to engage with the upper horizontal roll.

[Action]

According to the above configuration, the upper horizontal roll balancing arm is attached to the inner stand, and when the inner stand is inserted into the mill housing for H-section rolling,
The arm engages with a roll balance cylinder fixedly mounted on the mill housing via a locking member, and is constantly held upward during rolling. When the inner stand is pulled out from the mill housing, the balance arm is also integrally pulled out. Since it does not remain, it does not become an obstacle during rolling other than H-section steel.

〔Example〕

An embodiment of a rolling mill according to the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention. As shown as a plan view in FIG. 2, a horizontal roll 2 and a V roll 3 are incorporated in the inner stand 1, and the rolling load acting on the V roll 3 is transmitted to the inner stand 1 so that the inner stand 1 is V-shaped. It supports the rolling load acting on the roll 3.

FIG. 3 is a vertical sectional view of FIG. 2, in which the left side of the center line shows a set state of upper and lower horizontal rolls having a larger roll diameter, and the right side shows a set state of upper and lower horizontal rolls having a smaller diameter. As shown in FIG. 3 as a vertical sectional view, the upper and lower horizontal rolls 2 are incorporated in the inner stand 1, and
The chock 9 for holding the roll 3 is fitted to the protrusion 10 provided on the inner stand 1 and is held by being locked in the vertical movement. The rolling load acting on the upper horizontal roll 2 is supported by the mill housing 13 via the dummy block 11 and the hydraulic pressure reduction cylinder 12. The rolling load acting on the lower horizontal roll 2 is the trolley 14 and the load cell.
It is also held by the mill housing 13 via 15.

When assembling a two-stage roll in order to change the roll from H-section rolling to, for example, round bar rolling, it is necessary to pull out the inner stand assembly at the time of H-section rolling out of the complete mill housing 13.

FIG. 4 is a vertical cross-sectional view showing the state of roll change of FIG.
The left side of the center line shows the upper and lower horizontal rolls with a large diameter, and the right side shows the inner stand insertion and withdrawal state when the upper and lower horizontal rolls with a smaller diameter are installed. When it is pulled out of the housing 13, as shown in FIG. 4, the lifting rail 17 provided on the stock of the mill housing 13 is raised, and the carriage 14 and the rod 19 are pushed up to a certain height via the wheel rods 18.
The rod 19 pushes the V chocks 9 up through the rod 20 and pushes the inner stand 1 up through the V chocks 9. At this time, the carrier 16 is on the roll 2 and a gap required for pulling out the inner stand 1 assembly is provided between the dummy block 11 and the hydraulic pressure reduction cylinder 12, respectively. The hydraulic cylinder force of the apparatus acts on the carriage 14, and the inner stand 1 and the entire roll assembly are pulled out of the mill housing 13 while rolling on the rails 17.

At this time, the carrier 16 has the arm 21 extending upward on the operating side as shown in FIG. 1, and the roll balance hook 22 engaging with the arm 21 is separated from each other during rolling,
A gap 23 is created. A roll balance cylinder 24 for lifting the upper horizontal roll 2 upward during rolling is provided above the hook 22, and the cylinder force during rolling is applied via the hook 22, the arm 21, and the carrier 16 to the upper horizontal roll. 2 is transmitted. A similar mechanism is provided on the drive side, and the upper horizontal roll 2 is lifted upward by a total of two locations.

Fig. 5 is a vertical cross-sectional view showing an example of the rolling mill of the present invention, which is cut between the housing and the inner stand of Fig. 1,
The right half is further cut away to show the relationship between the arm 21, the roll balance hook 22, and the roll balance cylinder 24 extending above the carrier 16 in FIG.

FIG. 6 is a sectional view taken along the line AA in FIG. 5, showing a part of the front side,
FIG. 7 is a cross-sectional view of the same BB, showing the supporting state of the front vertical roll. Fig. 8 is a cross-sectional view of the same CC showing a part of the front side, horizontal roll assembly (bearing box part)
Indicates.

According to this embodiment, the hook 22 of the roll balance cylinder 24 for lifting the upper horizontal roll 2 upward and the carrier 16
Since the and can be detached via the arm 21, when the inner stand 1 is taken out of the mill housing 13, there is no balance beam in the mill housing 13. Therefore, since there is no balance beam during rolling other than H-section rolling, it does not hinder operation.

In addition, the roll balance cylinder 24 is installed on the fixed side,
Since the hydraulic piping required when mounted on the inner stand is not necessary for the inner stand, the work of disconnecting and connecting the piping is unnecessary.

〔The invention's effect〕

As described above, according to the present invention, since the roll balance cylinder for lifting the upper horizontal roll upward and the carrier locked by the upper horizontal roll can be engaged and disengaged via the balance beam, various rolled products can be obtained. Can be rolled with good operability. In addition, the roll balance cylinder is installed on the fixed housing side of the rolling mill, and the hydraulic piping required when it is mounted on the inner stand is not necessary for the inner stand, so there is no need for pipe disconnection work. It has effects such as labor saving of drawers and contribution to automation.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a rolling mill according to the present invention,
2 is a plan view showing the inner stand of FIG. 1, FIG. 3 is a vertical sectional view of FIG. 2, and is a sectional view in a working state in which an upper horizontal roll is pulled up and held at an appropriate position, and is left side from a center line. Shows the set state of the upper and lower horizontal rolls having a larger roll diameter, the right side shows the set state of the upper and lower horizontal rolls having a smaller diameter, FIG. The upper and lower horizontal rolls having a large diameter are shown on the right side, and the upper and lower horizontal rolls having a smaller diameter are shown when the inner stand is in and out. FIG. 5 shows the housing of FIG. FIG. 6 is a vertical sectional view with the inner stand, in which the right half is further cut away. FIG. 6 is a sectional view taken along the line AA in FIG. 5, and FIG. FIG. 8 is a sectional view of the same CC. 1 …… inner stand, 2 …… horizontal roll, 3 …… V roll, 13 …… mill housing, 14 …… carriage, 17 …… lifting rail, 21 …… arm, 22 …… roll balance hook,
24 …… Roll balance cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-63-235007 (JP, A) JP-B-48-24948 (JP, B1) JP-B-45-34687 (JP, B1)

Claims (1)

[Claims] 1. A rolling mill in which an inner stand on which upper and lower horizontal roll assemblies and vertical roll assemblies are mounted is provided integrally with a mill housing so as to be insertable and withdrawable, and the upper horizontal roll is held upward during rolling. While fixing the roll balance cylinder to the mill housing,
A rolling mill, wherein an arm engageable with the cylinder via a locking member is provided in the inner stand, and the arm is engaged with the upper horizontal roll.