JPH0339763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pass line switching guide device for changing pass lines in the middle of a rolling pass line in a two-strand rolling method for rolling steel products.

Some typical examples of this type of long steel rolling are shown in Figure 3. Among a series of rolling equipment, there is a single strand method that focuses on product types, a multiple strand method that focuses on productivity, and even quality and production. There are various forms, such as single and plural combination methods that aim at both sides of sex.

Particularly, the apparatus according to the present invention belongs to the latter category, such as the typical arrangement of a two-strand long steel rolling line as shown in FIG. It is also intended that

That is, in FIG. 3, the rough rolling rows in the long steel rough rolling roll arrangement area A are two strands of 2-pass lines A and B, and after passing through the pass line switching guidance region A, they are separated to form the long steel intermediate rolling row roll arrangement. If area E and finish rolling line area O are each composed of one strand type, areas E and O after the intermediate induction branch trough area C of the long steel rolling line, and furthermore, two-pass line in the process. When either A or B becomes unable to pass through due to trouble, roll change, or other reasons, long steel rolling production is forced on only one line.

However, even though each of the rolling rolls in the rough rolling row in area A is provided with roll holes for two lines, if production continues on one line in this way, the rolls in lines A and B The balance of wear is disrupted, and the hole wear of the pass line with a large amount of material passing progresses, which limits the service life per roll hole shape modification and shortens the life of the roll. Therefore, the frequency of roll replacement increases, which in turn leads to a decrease in the operating efficiency of the rolling equipment.

As mentioned above, in two-strand rolling, troubles occur after area C, or when the rolls are changed, one side of the rough rolling row is forced to be rolled, and the effectiveness of the rolls is reduced. Needless to say, it not only cannot be used, but also increases the frequency of rolling roll replacement, leading to a decrease in the operating rate of the production factory, which is a huge disadvantage.

Conventionally, as a countermeasure of this kind, a method of converting the pass line direction of the two pass lines A and B in the above-mentioned area A has been essential. In some cases, a line, two-guide, and two-power cylinder system is adopted, and with this method, it is difficult to control the operation of the guide and two power cylinders, and troubles related to this are likely to occur.

That is, FIG. 9 shows the setting state of the pass line switching guide device when both the two pass lines A and B are normally performing parallel rolling, but for example, the line after the intermediate guide guide 6 of pass line B is If it becomes impossible to pass the material, as shown in FIG. Make the pass line switch from B to A. In this case, in preparation for switching the guiding device guide 19, the guiding device guide 18 of line A must be moved back from the pass line in advance by activating the connecting rod 21 of the power cylinder 20. Furthermore, for the threading of material from line A to A, in order to return both lines A and B to a parallel state, the guiding device guide 19 is moved to its original position, that is, from the rolling mill exit side guide 4 to the guiding device guide 1.
9→The intermediate induction guide 6 is in a line, and on the line A side, the rolling mill outlet guide 3→The guidance device guide 18→The intermediate induction guide 5 is also in a line, and this is the pass line B→A, A→ Repeat A and one after another according to the wear condition of the roll.

In addition, if the line after the intermediate guidance guide 5 of line A becomes impossible to pass through, convert the path lines from line A to B and from line B to B as shown in Fig. 11.
The operation procedure is similar to that explained based on FIG. 10 above.

In this way, in the process of switching the pass line,
The operation of the two guide device guides had to be controlled in a timely manner using two power cylinders, which had drawbacks such as difficulty in controlling the operation and causing trouble.

The present invention eliminates such conventional drawbacks, makes it simple and easy to immediately change the rolling pass line for passing material in the middle of the line in two-strand rolling, and improves the roll wear balance of a rolling mill with a double-hole type. It is an object of the present invention to provide an automatic switching guidance device for a rolling pass line that can ensure that the rolls are used efficiently until their service life.

One embodiment of the present invention will be described below with reference to the drawings. Figures 1 and 2 show a pass line installed between rows of rolling mills as shown in Figure 3, which shows a typical example of a two-strand bar rolling line arrangement. This shows the switching guidance device, and 1 and 1' are rolls for a rolling mill in the row area for rough rolling of long steel, and these rolls 1 and 1' have annular grooves that form the rolling passes of two strand pass lines A and B. The roll holes 2a and 2b of the mold are recessed around the entire circumference of the roll, and the normally rolled material is rolled and pressed by the holes 2a and 2b of the lower rolls 1 and 1' on several of these rolling machines. It is designed to be led out to rolling mill outlet guides 3 and 4.

Since the roll grooves 2a and 2b wear out almost in proportion to the length of passage of the rolled material, in order to ensure the balance of the roll groove wear mentioned above and to obtain an appropriate and economical chance of modifying the roll groove. The reason is that it is desirable that the two pass lines A and B have the same usage conditions.

Therefore, the rolling mill exit side guides 3 and 4 installed on the exit side of the pass lines A and B of the two strands of the rough rolling row, and the intermediate rolling row and finishing rolling row of each single strand separated from this, are provided. Between the intermediate guide guides 5 and 6 that guide the rolled material to the lines A and B, the pass lines A-A and B-B of those two strands are connected.
Two guide device guides 7 and 9 consisting of a guide pipe or a guide trough corresponding to , 14 at bed 15
The guide device guides 7 and 9 on the induction guide operation frame 16 are installed in parallel as a set of 3 rows on the induction guide operation frame 16 which is rotatably installed above, and the guide device guides 7 and 9 on the induction guide operation frame 16 are connected to the rolling mill exit side guides 3 and 4 and intermediately. The guiding guides 5 and 6 are aligned with the pass lines A-A and B-B, and the guiding device guide 8 is aligned with the rolling mill outlet guide 3 and the intermediate guiding guide 6, or with the rolling mill outlet guide 4 and the intermediate guiding. Rolling pass line A leading to guide 5 →
The connecting rod 12 of one power cylinder 11 is connected to the connecting pin 12' to rotate the induction guide operating frame 16 around the central support shaft 10 in order to rotate it to a predetermined position corresponding to B or B→A.
This structure is connected to the guidance guide operation frame 16.

The present invention has the above-mentioned configuration, and two strips of rolled material that are normally rolled in a rough rolling train having two pass lines are rolled by several rolling mill rolls having two pass lines A and B as shown in FIG. It is rolled and pressed in the holes 2a and 2b of holes 1 and 1', formed, and guided to the rolling mill exit guides 3 and 4, passing through the guide device guides 7 and 9 and the intermediate guide guides 5 and 6, respectively. , pass line A → A, B on a line passing through pass lines A and B of intermediate rolling row and finishing rolling row of single strand
→ Two strands are rolled in normal rolling condition on B line.

If the line after the intermediate guiding guide 6 of pass line B becomes unable to pass the material due to trouble, roll rearrangement, or other reasons (indicated by Column path line A
Rolling production is performed using pass line A→A on one side of pass line A after the intermediate rolling train.

Further, when the power cylinder 11 is actuated to move the connecting rod 12 forward, the guiding guide operating frame 16 is moved around the central support shaft 10 by the guide rollers 13 and 14 to move the bed 15 through the connecting pin 12'.
The guide device guide 8 is moved to a position where both ends of the guide device guide 8 face the rolling mill exit guide 4 of the pass line B of the rough rolling row and the intermediate guide guide 5 of the intermediate rolling row and the pass line A of the finishing rolling row. The rolled material, which has been direction-changed and rolled through the groove 2b of the pass line B of the upper and lower rolls 1 and 1' of the rough rolling mill, is switched from pass line B to A through the guide device guide 8, and is then transferred to the intermediate rolling row and finishing. It is rolled through a rolling train (see Figure 6).

On the other hand, if the line after the intermediate guide guide 5 of the pass line A becomes unable to pass material, as shown in FIG. 16 rotates about the central support shaft 10 in the opposite manner to the above, and the guide device guides 7 and 9 rotate the pass lines of the rough rolling row, the intermediate rolling row, and the pass lines A-A and B-B of the finishing rolling row. The rolled material returned to the parallel state on a straight line and rolled through the groove 2b of the pass line B on one side of the lower rolls 1 and 1' on the rolling mill of the rough rolling row of the two-strand rolling as shown in Fig. 7. It passes through the rolling mill outlet guide 4, the guide device guide 9, and the intermediate guide guide 6, and is then rolled into pass line B→B.

In addition, if the path line A after the intermediate guide guide 5 becomes disabled as in the case of FIG. 7, the power cylinder 11 is operated again to further retreat the connecting rod 12 and the guide guide is activated via the connecting pin 12'. By rotating the frame 16, both ends of the intermediate guiding device guide 8 are moved to a position opposite to the rolling mill outlet guide 3 and the intermediate guiding guide 6 of the rough rolling row, and a pass line is formed as shown in FIG. After switching, the material rolled on pass line A of the rough rolling mill row passes through the guide guide 8 and the intermediate guide 6, and is rolled to the pass line B after the intermediate rolling row in the flow direction from pass line A to B. It is.

As explained above, the apparatus of the present invention includes a rolling mill outlet guide of a rough rolling row of a two-strand rolling method,
As a result, there is
2 corresponding to those pass lines A-A, B-B
A book and a set of three rows of guide pipes or guides for guides such as guide troughs are installed in parallel on a guide guide operation frame that is rotatable around a central support shaft, and one unit is installed in parallel. Since it is possible to switch the pass line from the rough rolling row to the intermediate rolling row to the finishing rolling row using only the power cylinders, in the process of switching the rolling pass line, two guide guides can be connected to the two power cylinders. Compared to conventional equipment, which requires timely operation control, the operating distance of the guidance device guide is halved, and at the same time, the operation control itself is unified, which improves the reliability of line switching. There are also fewer problems caused by control, and if a problem occurs in the intermediate rolling train or finishing rolling train, or if a line that cannot pass material due to roll change occurs, it is possible to immediately and easily change the pass line for passing material. However, the roll wear balance can be ensured by alternately using two pass lines by adjusting the rough rolling row roll hole shape to the roll wear state. Therefore, even if one of the two pass lines after this device becomes unable to pass through the material, the rough rolling row will alternately run the pass lines on both lines, depending on the wear condition of the roll holes. While switching, it is possible to maintain the wear balance of the double-hole type rolls and change the rolling mill rolls with an appropriate and economical roll-hole type life. It has features such as being able to reduce costs and improve product dimensional accuracy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the rolling pass line automatic switching guidance device of the present invention for rolling two strands of long steel, FIG. 2 is a front view thereof, and FIG. 3 is a schematic plan view showing a typical example of the arrangement of the rolling line for two strands of long steel. , FIG. 4 is a plan view showing the parallel rolling state of two strand pass lines A→A and B→B in the guiding device of the present invention, and FIG. 5 is a plan view showing the parallel rolling state of two strand pass lines A→
A plan view showing the state during rolling A, FIG. 6 shows the state when rolling from pass line B to A, FIG. 7 shows the state when rolling from pass line B to B, and FIG. 8 shows the state when rolling from pass line B to B. FIG. 9 is a plan view showing the state during A→B switching rolling, FIG. 9 is a plan view showing the state during two-strand 2-pass line A→A, B→B parallel rolling in a conventional induction device, and FIG. 10 is the same. Figure 11 shows the state when rolling is changed from pass line B to A.
→B is a plan view showing the state at the time of switching rolling. 1, 1'... Long steel rolling mill roll, 3, 4... Rolling mill outlet guide, 5, 6... Intermediate induction guide,
7, 8, 9...Guidance device guide such as guide pipe or guide trough, 10...Central support shaft, 11...Power cylinder, 12...Power cylinder connection rod, 1
6... Induction guide operating frame, A, B... Pass line in 2-strand rolling.

Claims (1)

[Claims] 1. A rolling mill outlet guide 3 for a rough rolling row having pass lines A and B in a two-strand rolling system for long steel.
4 and intermediate guide guides 5 and 6 that separate the rolled material after passing through and guide the rolled material to the pass lines A and B of the intermediate rolling row and finishing rolling row of each single strand system, respectively. - Guide device guides 7, 8, 9 such as guide pipes or guide troughs, which are a set of three rows of two corresponding to A, B-B and one in between.
are arranged side by side on an induction guide operating frame 16 which is installed so as to be able to rotate around the center support shaft 10, and a connecting rod of one power cylinder is connected to the operation frame 16, and the center support shaft 10 is Rolling pass lines A-A, B- with rough rolling row and intermediate rolling row in the center
An automatic rolling pass line switching guidance device characterized in that the rolling pass line B is switched from pass line A to B or from B to A in one operation via a guidance device guide 8.