JPH07124614A - Variable chock structure of vertical roll axis of universal rolling mill - Google Patents

Abstract

PURPOSE:To improve the efficiency of changing work of a roll assembly to a chock by attaching and detaching a guide bar to guide a vertical roll shaft freely to the chock. CONSTITUTION:The chock 1 is set so that a face to the pass line comes upwards on the face to the vertical roll 5. After this chock 1 is set, a stripper guard 2 is hoisted and taken away by the use of a crane. Then, the rods 6a, 7a of cylinders 6,7 are retreated respectively, a connetion with a vertical roll shaft 3 is cut, then, the guide bar 8 is hoisted by the crane in the same way and removed. In this way, the upper part of the chock 1 is opened and since the guide bar 8 interfering with the vertical roll shaft 3 is removed, the vertical roll shaft 3 and the vertical roll 5 are hoisted by the crane and removed from the chock 1 in a state that they are integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical roll chock of a universal rolling mill for rolling a shaped steel having a flange such as an H-shaped steel, and more particularly to a mechanism for facilitating vertical roll replacement work.

[0002]

2. Description of the Related Art When H-section steel, I-section steel or the like is rolled by a general universal rolling mill, the flange side precedes the web. Therefore, unless the stretching of the flange and the web per pass is rolled within a certain range, waves are generated in the length direction.

In order to prevent such a phenomenon, it is already known that the generation of waves in the web can be reduced by shifting the axis of the vertical roll from the axis of the horizontal roll in the rolling direction. Further, in Japanese Patent Laid-Open No. 4-25001,
By setting the web biting start position prior to the flange biting start to a position where it can be rolled to a position where the flange can be pinched by the vertical roll and the side face of the horizontal roll, rolling A high-precision rolling method with improved bias is disclosed. A mechanism for moving the shaft center of the vertical roll is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-17211.
As described in Japanese Patent Publication No. 5, a vertical roll shaft is loaded on a roll chock, a vertical roll is provided around the vertical roll shaft via a bearing, and a cylinder is connected to the vertical roll shaft for shifting the shaft center. It's being used.

In order to guide the vertical roll axis in the rolling direction,
The chock must be provided with a guide bar on which the vertical roll shaft slides. FIG. 5A is a plan view of a chock similar to that used in the chock structure described in the above publication, and FIG. 5B is a sectional view taken along the line CC of FIG. 5A. It is a figure, and the guide bar 52 provided in the chock 50 in which the cylinder accommodating portion 53 is formed is configured as an integral member so as to be a strength member of the chock 50 against the rolling reaction force P and the draft force F, and its position is vertical. It was designed so that it would not interfere with the horizontal insertion and removal of the roll.

[0005]

In the replacement work of the roll assembly having the conventional structure, the chock 50 is moved by moving the vertical roll shaft in the axial direction thereof and separating it from the vertical roll.
The vertical roll is then pulled out horizontally from the opening of the chock 50.

In the procedure, it is necessary to pull out the vertical roll with respect to the chock 50 with the vertical roll axis ahead, and then to pull out the vertical roll horizontally. The reason is that the guide bar 52 provided as a guide for the vertical roll axis. Due to the existence of.
That is, since the guide bar 52 is a sliding guide for the vertical roll shaft, the guide bar 52 and the chock 50 are connected to each other.
Since it is a strong member, it cannot be pulled out to the line side.

Therefore, in the conventional chock structure, it is required that the vertical roll shaft and the vertical roll be separately inserted into and removed from the chock, and that the vertical roll shaft and the guide bar 52 be prevented from interfering with each other. It Therefore, the work of flipping the chock 50 upside down will be repeated many times, which poses a safety problem, and the roll assembly replacement time is considerably long, and the roll must be pulled out from the roll shaft unnecessarily. However, this has led to a decrease in the operating rate of the line. Further, in order to improve efficiency, a recombining device is separately required, which leads to an increase in cost.

[0008] The problem to be solved in the present invention is to improve the efficiency of the replacement work for the chock of the roll assembly in the vertical roll type variable center rolling mill.

[0009]

SUMMARY OF THE INVENTION The present invention is a vertical roll chock in which a vertical roll shaft of a universal rolling mill is shiftably mounted on a chock by a cylinder in the pass line direction of a rolled material, and the chock faces the pass line. The guide bar for slidingly guiding the vertical roll shaft in the moving direction is detachable.

Further, by making the cylinder compact and appropriately installing the cylinder, it is possible to eliminate the notch in the chock of the cylinder accommodating portion and secure the strength against the rolling reaction force and the draft force.

[0011]

[Function] Since the guide bar can be attached to and detached from the chock, when reassembling the vertical roll, all that is required is to remove the guide bar, and then remove the vertical roll shaft from the chock to remove it from the chock together with the vertical roll. be able to. Also, in the case of incorporation, the vertical roll and the vertical roll shaft can be similarly attached to the chock as an integrated body. Therefore, as compared with the conventional method in which the vertical roll shaft and the vertical roll are different in insertion / removal direction, if the surface where the chock faces the rolling pass line is upward, the vertical roll shaft and vertical roll can be moved using a crane or the like. It can be attached and removed by inserting and removing in one direction.

[0012]

1 is a plan view of a vertical roll chock equipped with a vertical roll shaft center varying device of the present invention, and FIG. 2 is a vertical sectional view taken along the line A--A of FIG.

In the drawing, a vertical roll shaft 3 is loaded and incorporated in a chock 1 which is provided with a stripper fund 2 detachably, and a bearing 4 (FIG. 2) is installed around the vertical roll shaft 3.
The vertical roll 5 is provided via the (refer to). Vertical roll shaft 3
Is incorporated in the chock 1 so as to be movable in the traveling direction of the rolled material (indicated by the arrow in the figure) and the opposite direction thereof, and is equipped with hydraulic cylinders 6 and 7 for moving the same.

The cylinders 6 and 7 are respectively arranged at the upper and lower ends of the chock 1, and the rods 6a and 7a are connected to the vertical roll shaft 3. The illustrated state is shifted by a distance D in the traveling direction of the rolled material with respect to the axis of the horizontal roll (not shown) (indicated by the one-dot chain line), and as described in the section of the prior art, the web portion of the rolled material. It is possible to carry out rolling while preventing unevenness.

A guide bar 8 functioning as a sliding guide is provided at a position where the chock 1 faces the stripper fund 2. The guide bar 8 is bridged over an opening edge provided in the chock 1 for incorporating the roll assembly, and is connected by inserting a pin 9 provided in the guide bar 8 into a pin hole formed on the chock 1 side. .

Here, as shown in FIG. 5, in the conventional structure, the guide bar 52 is formed integrally with the chock 50, so this guide bar 52 serves as a strength member,
With respect to the rolling reaction force P and the draft force F, the stress in the corner portions 51 and 54 of the chock 50 is suppressed. On the other hand, when the guide bar 8 is a separate body, the strength tends to decrease with respect to the entire chock 1.

In the present invention, against such a decrease in strength,
By making the cylinders 6 and 7 thin and disposing them on the top of the chock 1, the notch of the chock 1 is eliminated and the strength against rolling reaction force and draft force is secured. As the structure, a structure as shown in the schematic cut-away plan view of the chock 1 shown in FIG. 3 excluding the roll assembly is adopted.

That is, the hydraulic cylinders 6 and 7 for shifting are made thin with respect to the chock 1, and these are arranged outside the chock 1 to eliminate the groove by the cylinder housing portion 53 in the conventional example shown in FIG. As a result, the strength of the chock 1 is increased, and the stress generated in the corner portions 51, 54 (also shown in FIG. 3C) against the draft force F is reduced as described in FIG. Further, the rolling reaction force P is not a problem because it receives compressive stress due to the guide bar 8.

Therefore, even if the guide bar 8 is not integrally provided, the overall rigidity of the chock 1 is not significantly reduced, and the problem of strength is solved.

In the above construction, the work of replacing the vertical roll 5 being used with a new one is performed by first pulling out the chock 1 from the housing of the rolling mill. FIG. 4 shows the outline of the replacement work after this withdrawal in order.
The chock 1 is set such that the surface facing the vertical roll 5, that is, the surface facing the pass line in the housing of the rolling mill is upward. Incidentally, such an operation is the same as in the case of exchanging a normal vertical roll having a fixed roll shaft core.

After the above chocks have been set, the stripper fund 2 is lifted and removed using a crane (not shown) ((b) in the same figure). And the cylinders 6, 7
Rods 6a and 7a of the vertical roll shaft 3
Then, the guide bar 8 is similarly lifted by a crane and removed ((c) in the same figure).

By the work up to this point, the upper part of the chock 1 is opened, and the guide bar 8 which interferes with the vertical roll shaft 3 has already been removed, so that the vertical roll shaft 3 and the vertical roll 5 remain integrated. It can be lifted with a crane and pulled out from the chock 1 ((d) in the same figure). At this time, since the rods 6a, 7a of the cylinders 6, 7 are retracted, the vertical roll shaft 3 does not interfere with the rods 6a, 7a to apply a bending load or the like.

As described above, the guide bar 8 is formed separately from the chock 1, so that the vertical roll 5 and the vertical roll shaft 3 and the vertical roll 5 are provided so that the vertical roll 5 comes to the upper surface side. It is possible to remove the roll 5 and the chock 1 at the same time, and the working time becomes shorter than the conventional method of removing the vertical roll shaft and the vertical roll from different directions.

The work of incorporating a new vertical roll into the chock 1 may be carried out in the reverse order of the description of FIG. 4, and in this case as well, the work time is short. Further, during the rolling operation, even if the guide bar 8 is formed separately from the chock 1 by the structure shown in FIG. 3, the reduction of the stress level can be covered, and the operation of high rolling load is not hindered.

[0025]

According to the present invention, since the guide bar for guiding the vertical roll shaft can be freely attached to and detached from the chock, the vertical roll shaft and the vertical roll can be removed by removing the guide bar when replacing the vertical roll. Can be connected and disconnected at the same time. For this reason, compared with the method shown in the conventional example in which the vertical roll shaft and the vertical roll are removed and inserted in different directions, the work time is shortened, and the work of reversing the chock many times is also required. It becomes unnecessary and secures safe work.

Further, by making the shift cylinder thin and changing its position so as to eliminate the notch in the cylinder housing portion, even if the guide bar is not integrally provided, the strength of the chock is prevented from lowering due to stress. It is possible to maintain the strength that does not hinder rolling.

[Brief description of drawings]

FIG. 1 is a plan view of a vertical roll chock equipped with a vertical roll axis varying device of the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

3A and 3B are schematic diagrams showing how the guide bar is attached to and detached from the chock. FIG. 3A is a plan view when the guide bar is removed, and FIG. 3B is a BB line in FIG. 3A. A sectional view taken along the arrow, (c) of the same drawing is a plan view showing a direction in which a rolling reaction force and a draft force act when a guide bar is mounted.

FIG. 4 is a schematic front view showing in sequence the procedure for extracting a vertical roll from a chock.

5A and 5B are diagrams showing a relationship between a chock and a guide bar in a conventional example, in which FIG. 5A is a plan view and FIG.
FIG. 4 is a cross-sectional view taken along the line C-C of FIG.

[Explanation of symbols]

 1 Chock 2 Stripper Fund 3 Vertical Roll Shaft 4 Bearing 5 Vertical Roll 6 Cylinder 6a Rod 7 Cylinder 7a Rod 8 Guide Bar 9 Pin

Front page continuation (72) Inventor Kazuhiro Teraura No. 1 Tsukiko Hachiman-cho, Sakai City, Osaka Prefecture Nippon Steel Corporation Sakai Steel Co., Ltd.

Claims (1)

[Claims] 1. A vertical roll chock in which a vertical roll shaft of a universal rolling mill is incorporated in a chock so that it can be shifted in the pass line direction of a rolled material by a cylinder, and the chock is provided on a surface facing the pass line. The vertical roll axis variable chock structure of the universal rolling mill that allows the guide bar that slides and guides in the moving direction to be detachable.