JPS5970412A - Method for rearranging roll - Google Patents

Abstract

PURPOSE:To rearrange rolls of a required stand without stopping the running of a continuous rolling mill by shifting work rolls in the axial direction when a gap between the upper and lower work rolls of each stand of the mill is widened. CONSTITUTION:Each pair of pinch rolls 40 is kept in a released state during normal running; the gaps of upper and lower backup rolls and work rolls 21, 22 and 11, 12 are widened and each pair of pinch rolls 40 is actuated to pinch a material 10 when the rolls of (Sn)th stand are rearranged. Next, the rolls 11, 12 are taken out in the axial direction, and then a material supporting mechanism 50 is actuated to bring rolls 52 into contact with the material 10. In case of using a construction which raises the roll 11 only, the material 10 is kept out of contact with the roll 12 by raising the rolls 40 while keeping the pinched material 10 as it is. In this manner, the roll rearrangement of other stands is performed in sequence after completing the roll rearrangement of the (Sn)th stand.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for changing rolls in a continuous rolling mill.

Work rolls used in rolling mills are worn during rolling at a portion corresponding to the width of the rolled material. If this wear is left unattended and rolling is continued, the shape of the rolled material will deteriorate. For this reason, in the conventional rolling method, rolling is started from the material with the largest width, and finally the material with the smallest width is rolled, and the rolls are changed after the rolling is completed. The removed work rolls are ground on another line and reused.

In such a rolling method, the cycle rolling amount is 1000~
The rolling capacity is limited to about 3000 tons, and the entire rolling line must be stopped every time the rolls are changed. Role changes occur about three times per day on average. For this reason, rolling efficiency is reduced by as much as 3 to 5%.

Various proposals have been made in the past in order to shorten the roll changeover time. Typical examples include a turn table method and a side shift method. In the turn table method, the roll chock is supported by a turn table, and the turn table is rotated when changing rolls.

The side shift method involves sliding the roll chock.
It is supported on a bed and moves the slide bed in the lateral direction of the stand when changing rolls. However, these methods require the entire rolling line to be stopped, and there is a limit to the reduction in roll changeover time.

Therefore, an object of the present invention is to provide a method for efficiently changing the necessary rolls of a stand without stopping the operation of a continuous rolling mill.

The roll rearranging method of the present invention is characterized in that, in a continuous rolling mill consisting of a plurality of stands, the interval between the upper and lower work rolls of each stand can be adjusted, and the interval between the work rolls of a predetermined stand is increased. When the work
The material is configured to be able to move in the axial direction while supporting the rolls horizontally, and the material is supported by the material support mechanism when the distance between the work rolls is widened and after the upper and lower work rolls are extracted from the stand. thing,
After the roll reshuffling of a predetermined stand is completed, the roll reshuffling of other stands is sequentially performed.

The roll changing method of the present invention will be specifically explained with reference to the drawings. FIG. 1(A) shows a normal rolling state in a continuous rolling mill consisting of a plurality of stands.

FIG. 1(B) shows the rolling state of other stands when the rolls of a predetermined stand Sn are changed. FIG. 1(C) shows the rolling state after the rolls are removed from the predetermined stand Sn.

3 to 7 show apparatus for carrying out the method of the invention. 3 and 4 correspond to FIG. 1(A).

FIG. 5 corresponds to FIG. 1(B).

In principle, the method of the present invention is constructed so that the distance between the upper and lower work rolls of each stand can be adjusted.

For example, as shown in FIG.
An expansion/contraction drive unit 13 such as a hydraulic cylinder or a hydraulic jack may be provided between the two.

The distance between the upper and lower backup rolls 21, 22 is adjusted by the existing rolling down unit 23. When adjusting the distance between the upper and lower work rolls 11 and 12,
First, the spacing between the upper and lower backup rolls 21 and 22 is adjusted.

In the rolling mill shown in FIGS. 3 and 4, the lower work roll 12 does not move downward, and only the upper work roll 11 moves upward, increasing the distance between the rolls. There is something.

FIG. 2 shows the roll change and rolling state in such a case. The rolling state shown in FIG. 2 will be described later.

When the interval between the work rolls 11.12 of a predetermined stand Sn is widened, the work rolls 11.12 are configured to be able to move in the axial direction while being supported horizontally. In the case of the rolling mill shown in FIGS. 3 and 4, the guide bar 31 is mounted horizontally on the frame 30 of the stand above the upper work roll 11, and the frame 30 is mounted below the lower work roll 12. Attach the guide rail 32 horizontally. The downstream side (fourth
A hook 311 (see FIG. 6) is rotatably attached to the upper part of the roll chock 111 on the left side in the figure. When the upper work roll 11 rises, the hook 31
1 engages the guide bar 31. Wheels 3 are installed at the bottom of the left and right roll chocks 112 of the lower roll 12.
12 is rotatably mounted and engages the guide rail 32.

The material 10 is then supported as it passes through a given stand Sn when the work rolls 11.12 are spaced apart. To accomplish this, a pair of pinch rolls 40 are installed between each stand, as shown in FIG. The pinch rolls 40 may be any type having the function of pinching the material 10 between the rolls and the function of moving up and down while holding the material.

As shown in Figure 1 (B), the work roll 11°12
move up and down relative to each other to increase the distance between the rolls.
It is only necessary to provide the function of pinching the material between the pinch rolls 40. However, as shown in FIG. 2, when only the upper work roll 11 moves upward and the distance between the rolls widens, the function to clamp the material 10 and the function to move upward in the clamped state □ It is preferable to have the following. The reason for this is that when extracting the upper and lower work rolls 11 and 12, the lower work roll 12
This is to prevent the material from coming into contact with the material 10 and damaging the material.

Finally, after the upper and lower work rolls 11, 12 are taken out from the predetermined stand Sn, the material is supported so that the front and rear ends of the material do not protrude into the lower part. The configuration to do this is
For example, a material support mechanism 50 as shown in FIG. 1(C) and FIG. 7 is preferable.

This material support mechanism 50 includes several rolls 52 of Japanese cypress rotatably attached to one end of a bracket 51, guide plates 53 fixed to both sides of the roll 520, and swung by a fluid cylinder 54 using the other end of the bracket 51 as a fulcrum. It is designed to move. During normal rolling, the alternative roll mechanism 50 is in the retracted position as shown in FIG.

A series of steps for carrying out the method of the present invention will be summarized and explained. First, as shown in FIG. 1(A), during normal rolling, each pinch roll 40 is kept open. When rearranging the upper and lower work rolls 11.12 of a predetermined stand Sn, as shown in FIG. 1(B), the upper and lower backup rolls 21.22 and the upper and lower work rolls 11.
12 and operate each pinch roll 40 to pinch the material 10. As shown in FIG. 5, a roll chock 111 is located downstream of the upper work roll 11 in the direction of extraction.
A hook 311 attached to the upper part of the roll chock is hooked onto the guide bar 31, and the expansion/contraction drive unit 13 supporting the roll chock is contracted to the maximum limit. Next, the upper and lower work rolls 11 and 12 are taken out. After extracting the upper and lower work rolls 11 , 12 , the material support mechanism 50 is actuated to bring the roll 52 into contact with the material 10 .

In a structure in which only the upper work roll 11 is moved upward, as shown in FIG. 10 to avoid contact.

After the roll reshuffling of the predetermined stand is completed in this way, the work rolls of the other stands are sequentially reshuffled in the same process as described above.

Note that rolling is performed while compensating for a reduction in the rolling reduction of the stand due to roll rearrangement using other stands.

As is clear from the above explanation, according to the method of the present invention, it is possible to easily change the rolls without stopping the rolling line, improve productivity, and eliminate the width restriction of the rolled material. As the pressure is relaxed, it becomes possible to roll from a narrow material to a wide material, and as a result, it becomes possible to roll in the order in which hot charges are received, and it is also possible to improve the fuel consumption rate.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention. FIG. 2 is an explanatory diagram of a modification of the method of the present invention. FIG. 3 is a schematic side view of an apparatus for carrying out the method of the invention. FIG. 4 is a front view seen from the mV-mV line in FIG. 3. FIG. 5 is a drawing similar to FIG. 4, and shows the state when the roll is taken out. FIG. 6 is an end view taken along line M-w in FIG. 5. FIG. 7 is a perspective view of an alternative roll. 10: Material 11: Upper work roll 12:
Lower work roll 21: Upper backup roll 22: Lower backup roll 30: Frame 31 Guide bar 32 Guide rail 4o: Pinch roll 50: Material support mechanism Patent applicant Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] In a continuous rolling mill consisting of a plurality of stands, the interval between the upper and lower work rolls of each stand can be adjusted, and when the interval between the work rolls of a given stand is widened, the □When the gap between the work rolls is widened and after the upper and lower work rolls are extracted from the stand, the material is supported by the material support mechanism. A role reshuffling method consisting of: