JPH01178318A - Rewinding equipment for tight annealed coil - Google Patents

Abstract

PURPOSE:To prevent broken flaws based on buckling and to reduce adherence flaws by providing an auxiliary roller in contact with the external circumferential surface of a strip on the side of the progressive direction of the strip from a separation line in the width direction occurring at a place where the rewound strip is separated from a coil. CONSTITUTION:When the strip 11 is pulled out of the coil 10 and rewound on a tension bridle roll 110, a frame 40 stands up vertically and both rolls 20, 30 do not come into contact with the strip 11. Thereafter, the frame 40 is titled by a tilting cylinder 42 to the side of the coil 10 and the auxiliary roller 20 presses the external circumferential surface of the coil 10 from a separation line X' in the width direction of the coil 10 in the progressive direction of the strip 10 along this separation line X'. The winding restraint in the width direction of the strip 11 by the auxiliary roller 20 is enlarged and a separation position of the strip in the width direction is arranged forcedly. The frame 40 is titled by the tilting cylinder 42 to the coil side with the small change of the diameter of the coil 10 to touch the auxiliary roller 20 to the external circumferential surface of the coil 10. In this way, scratches based on the deviation of the coil, etc., are prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can effectively prevent adhesion defects that occur as a result of unwinding of a tightly annealed coil in the entry side equipment of a skin pass rolling mill, etc. The present invention relates to a tight annealing coil unwinding facility.

[Conventional technology]

In cold rolling mills, adhesion defects are a typical chronic defect. This cohesive flaw occurs during tight annealing.
When the strips are in close contact with each other and are unwound at the entrance side of the temper rolling mill in the primary process, there is a sound of peeling.) 1377
It is said to be a surface defect that occurs on the surface, and seizure is also called a flaw, sticking, or sticker. Since the occurrence of these defects causes inconveniences such as a decrease in product yield, a decrease in the operating rate of the temper rolling mill, and the need to rearrange the work rolls of the rolling mill, it has been desired to develop a means for preventing such defects.

[Problem that the invention seeks to solve]

Therefore, the cause of the occurrence of adhesion flaws has been investigated, and so far it has been found that the occurrence of adhesion flaws occurs during the annealing process.
It is thought that this is due to the diffusion of iron atoms in the areas where the J tubes are in contact with each other. Therefore, the stronger the degree of this diffusion, the more severe the state of the adhesive flaw becomes, and therefore factors that can influence this diffusion are considered to influence the degree of fusion. The factors include the following.

■Furnace temperature: If this is high.

■If this is high, ■S)
Cleanliness of lub surface: If this is high.

Silicate (SiOz) layer on the surface: If this is thin.

■Profile in the strip width direction (plate thickness): If there is an abnormality in this profile.

Surface roughness: if this is small ■Coil annealing temperature: If this is high.

■Coil cooling temperature: If this temperature is fast, both of these are thought to be involved in the occurrence of adhesion defects.

Therefore, various measures for preventing adhesion defects have been devised in response to these factors, including the following.

φKeep the temperature inside the furnace appropriate.

d) The winding tension in process 8 (electrolytic cleaning and cold rolling mill) before annealing is weakened.

Apply an anti-adhesion agent (A/, Ti powder, etc.) to the surface of the 4-stroke IJ tube or increase the thickness of the silicate layer.

In order to eliminate abnormalities in the profile (thickness) in the width direction of the φ strip, it is necessary to prevent roughness of the hot rolling roll and to optimize the number of hot rolling cycles. Since this is likely to occur, the surface roughness should be increased.

The annealing cycle should be reviewed and the annealing temperature should be lowered, the cooling time should be longer, and the product should be slowly cooled. Eventually, this will lead to a decrease in efficiency.

The present invention was created in conjunction with a new understanding of the mechanism of occurrence of adhesion flaws, and is intended to completely prevent the occurrence of adhesion flaws.

[Means for solving problems]

As shown in FIG. 1, the structure of the tight annealed coil unwinding equipment of the present invention is as follows. The basic feature is that both outer peripheries of the strip (1a) near the peeling line X and the auxiliary roller (2) are brought into contact with each other on the advancing direction side of the strip (1a).

Further, the configuration of the second invention, as shown by the imaginary line in the same figure,
A reversing roller (3) is arranged to sandwich the auxiliary roller (2) between the coil (1), and the opposite side of the strip (1a) that is wound around the auxiliary roller (2) and extended is placed on this reversing roller. (3) The basic feature is that it can be wrapped around and reversed.

Furthermore, these rollers (21 (31) move with the small change in diameter of the coil (1) due to one unwinding, the auxiliary roller (2) can always come into contact with the outer peripheral surface of the strip (1a), and the reversing roller (3) should be able to follow the movement of this auxiliary roller (2).

The above configuration of the present invention is because the conventional measures have not been very effective in preventing adhesion flaws.

It was created by going back to the basics and once again pursuing the mechanism of flaw generation, and gaining new knowledge about it.

Below, we will explain the process of elucidating the mechanism of adhesive flaw occurrence that led to this knowledge.

The inventors of the present invention collected samples of adhesive flaws and observed them, and also observed the behavior of the coil in the occurrence of adhesive flaws, and obtained the following results.

When the coil was stretched over its entire length, a state as shown in FIG. 2 was observed. In other words, adhesion flaws are overwhelmingly found near the center of the strip (1a) in the width direction;
a) From about 1/4 of the total length near the unwinding tip to 1/4
It is concentrated in the range up to 2<2, and hardly occurs on the 1st unwinding front and rear end sides. Moreover, if you look closely, you can see that this flaw has occurred only on the inner circumferential surface of the cough strip (1a), which was the inner surface of the wound strip (La) when it was coiled.

If the mechanism of adhesion flaws is that they are formed when the IJ tab (1a) in close contact is forcibly peeled off, as previously thought, then the peeling flaws are caused by the opposite IJ. It should be possible to form it on each surface of the tube (1a) (that is, on both the inner and outer circumferential surfaces of the strip (1&)). Therefore, such conventional estimation is not correct.

Therefore, the present inventors carefully observed coil unwinding equipment, such as the entrance side of a temper rolling mill, where coil unwinding is performed where adhesive flaws occur.

FIG. 3(a) is a perspective view schematically showing the unwinding state of the coil (1) when an adhesive flaw occurs on the surface of the IJ tube (1a). From the coil (1) state to the strip (
When transitioning to state 1a), it was observed that the peeling position of the strip (1a) was different in the width direction. That is, the central part of the strip (1a) is peeled off at the two points shown in FIG. 6(b), and the both ends of the strip (1&) are peeled off at the Y point and drawn into the tempering mill (100) (1oo).

The present inventors thought that this difference in the peeling position in the width direction may be deeply involved in the occurrence of adhesion flaws, and investigated the flaw generation mechanism from this point of view, and found that the above-mentioned adhesion flaws It was assumed that the breakage was due to a buckling phenomenon caused by a difference in the peeling position in the direction. Considering this, it is also consistent with the fact that the above-mentioned adhesion flaw occurs only on the inner circumferential surface of the sl-IJ tube (1a).

Therefore, various means for aligning the peeling positions in the width direction were devised as a method for unwinding the coils that do not cause bending even when the coils are in close contact with each other.

One of them is to increase the unwinding tension. However, this has serious disadvantages such as the coil becoming bamboo-like and causing scratches, and it is also difficult to align the peeling position in the width direction.

Also, attempts have been made to ensure the roundness of the coils, reels, and rolls, but these efforts have not been as effective as expected, and moreover, these have to be replaced frequently, which is not practical.

Furthermore, the tension roll is made of variable crown (VC).
) so as to be able to change the tension distribution in the width direction, but this would require large-scale equipment and increase costs.

Then, as shown in Fig. 4, a peeling line stabilizing roll (200) is pressed against the strip (1a) from the inner peripheral surface side of the strip (1a) peeled off from the coil (1) to forcibly set the peeling position. I also tried aligning them. but,
Peeling position of strip (1a) and the roll (200)
Since there is always a certain distance S from the contact position, it is difficult to align the peeling positions, which is almost the same as when the unwinding tension is increased.

As a result of such trial and error, the configuration of the present invention described above was invented.

[For production]

In the present invention, the auxiliary roller (2) is located on the side of the wrist strip (1a) in the traveling direction of the widthwise peeling line X of the unwinding coil (1) and near the peeling line By coming into contact with this from the side.

This auxiliary roller (2) increases the winding restraining force in the width direction of the strip (1a), making it possible to forcibly align the peeling positions. Therefore, the contact point of the auxiliary roller (2) is pulled closer to the separation line X. Also, as in the second invention, when the reversing roller (3) is brought into contact with the IJ tab (1a) from the opposite side, the peeling point of the strip (1a) on the opposite side will be separated by its width. This makes it easier to forcibly align the peeling positions.

〔Example〕

FIG. 5 is a front view showing the structure of the entrance side of a skin pass rolling mill, which has both the structure of the first invention and the structure of the second invention. In the figure, the coil is an unwinding coil, and (110) and (110) are the tension pry rolls of the temper rolling mill.

In the configuration of this embodiment, a frame (40) is pivotally supported on a bracket (41) provided on a base A of a temper rolling mill, and an auxiliary roller (A) and a reversing roller are attached to the frame (40). (up to) are provided (the diameter of these rolls is 50
05w+Il or less)a On the side of this frame (40), the rod (42&) of the tilting cylinder (42) rotatably mounted on the base A is pivotally mounted. 42) allows the frame (40) to tilt from an upright position toward the coil section.

The auxiliary roller wire is rotatably attached to the side surface of the frame (40) along the peeling line When the coil (40) is tilted toward the coil (11), the coil (11) comes into contact with the outer surface of the coil (11) along the peeling line It looks like this.

In addition, the reversing roller (to) is connected to the guide groove (to) of the frame (40).
A movable piece (31) is rotatably mounted on the side surface of the roll lifting cylinder (32) to be guided by the roll lifting cylinder (32) and move up and down.

Note that (50) and (51) are sheet threading guides, whose inclinations are made to vary with small changes in the diameter of the coil αl by the sheet threading guide frame (52) and its tilting cylinder (53). There is. Of these, the threading guide (50
), as shown in FIGS. 6(a) and 6(b), the fixed guide pieces (50a) are arranged in the shape of a drainboard, and the fixed guide pieces (SOa) are also arranged in the shape of a drainboard. A moving guide piece (5) movable in the coil (111 direction)
0b) and a cylinder (SOC) that moves the moving guide piece (5ob) in the above direction, and as the diameter of the coil (1(l) changes as it rewinds, at this time the cylinder (SOC) The moving guide piece (50b) is moved closer to the direction of the coil α1 by extending the rod of the SOC (SOC).The other threading guide (51) is also shown in FIGS. 7(a) and (b). The fixed guide pieces (Sta
) and fixed guide pieces (St
a movable guide piece (51b) movable from the gap in the direction of the sheet passing guide (50);
51b) in the above direction (51e)
It has This threading guide (51) is provided separately from the threading guide (5o) for convenience during strip threading work.

The coil unwinding equipment having such a configuration is used in the following manner. At the stage of threading the strip I, that is, when pulling out the IJ tube αυ from the coil QQ and winding it around the tension pry roll (no) Qlo), the frame (40) is in an upright state, and the frame (40) is in an upright state.
There is no contact between the two rollers (to) (7) on J-tube a and old. In addition, as mentioned above, when threading ζζ, the reversing port is positioned downward, so the threading guide (51)
As shown in FIG. 5, the movable guide piece (stb) is sent out toward the plate passing guide (50) by the cylinder (51c), and is thereby in a state that is substantially continuous with the cough plate passing guide (50). Board work processing can be facilitated.

After that, the frame (40) is moved by the tilting cylinder (42).
is tilted toward the coil (II side), and the auxiliary roller (A)
is on the traveling direction side of the coil α1 from the peeling line X in the width direction, and is pressed against the outer circumferential surface of the coil α along the peeling line X. At this time, the roll lifting cylinder (32 If the rod (32a) of ) is kept in an extended state, the reversing roller (to) will not come into contact with the IJ knob α9 and will remain in a standby state. In addition, the strip (111) is attached to a tension ply roll (IIO
If the rod (32a) of the roll lifting cylinder (32) is retracted before the threading work for winding the sheet onto the
Similarly, as shown in FIG. 8, the reversing roller (111) does not contact the strip (111), and only the auxiliary roller (111) contacts the strip (111).

By pressing the auxiliary roller ■ against the outer periphery I of the coil α1, the strip α9 caused by the auxiliary roller
Increase the winding restraining force in the width direction, and increase the winding restraint force in the width direction.
The IJ protrusion peeling position can be forcibly aligned.

In addition, as the diameter of the coil α1 decreases due to unwinding, the tilting cylinder (42) gradually tilts the frame (40) toward the coil (1G side), thereby keeping the auxiliary roller (a) always on the outer peripheral surface of the coil α1. Can be touched.

Therefore, it is possible to stably align the peeling positions in the width direction. In addition, along with this operation, the tilting cylinder (
53) changes the inclination of the threading guide frame (S2), and the movable guide piece (sob) of the threading guide (50) is moved closer to the outer peripheral surface of the coil whose diameter changes by the cylinder (SOC). become.

On the other hand, when the reversing roller (to) which has been positioned downward is moved upward by the roll lifting cylinder (32), the strip αD is moved between the auxiliary roller and the reversing roller (to) as shown in FIG. The coil CLI is pulled out from the coil CLI to the tension pull roll (IIOXIIO) by drawing a figure 8 pattern. At this time, the reversing roller (to) is the auxiliary roller (
By increasing the winding restraining force in the width direction of the strip (111), it is possible to more reliably align the IJ lubricant peeling position.
When lifting the plate guide (51), the moving guide piece (
51b) is drawn in by the cylinder (51c) and it is necessary to create a gap between the two sheet passing guides (50X51) so that the roller (to) can rise.

In addition, by tilting the frame (40) in accordance with a small change in the diameter of the coil Ql in the same way as described above, the auxiliary roller (4) is always brought into contact with the outer peripheral surface of the coil elG, and the reversing roller (7) is brought into contact with the outer peripheral surface of the coil elG. Make them follow suit.

In order to eliminate the difference in peeling points in the width direction of the coil QL, it is necessary to maintain uniform tension distribution in the width direction of the IJ tube αB, and for this purpose, the position of the auxiliary roller (3) is on the side in the traveling direction of the strip cL11. Even if the ball force separation line
The most recent is preferred. Therefore, the smaller the roll diameter of the auxiliary roller I20, the more effective it is, but in reality, it is determined by the bearing strength due to the reaction force of the strip circle. In this embodiment, for this reason, the roll diameter of the auxiliary roller (1) is set to 500 m11 or less. It is also preferable that the length of the roll is greater than or equal to the maximum width of the passing strip α1).Next, the present inventors applied this method to the entrance side of a two-stand temper mill that temper-rolls tight annealed coils. Example equipment was attached to investigate changes in the degree of adhesion flaws that occur on strips.

In that case, the outline of the temper rolling line equipped with the coil unwinding equipment of this embodiment and the location where the samples were checked are as shown in FIG. That is, the unwinding equipment for the tight annealing coil αQ has a frame (40) that allows the auxiliary roller and the reversing roller (30) to be pressed against the outer circumferential surface of the coil 1 and reversely pressed. There the unwound strip (lυ is the tension pry roll (
IIOXIIO), rolled on the #1 and #2 rolling stands, and then rolled on the tension pry roll (1
10) After cutting the diameter of (110), it is wound again to form a coil (10a). Among them, the sample confirmation location is the tension butaidol roll (110) (110) on the entrance side.
and #1 rolling stand (inlet sample collection location) and between #2 rolling stand and outlet tension pry roll (
110) (110) (outlet side sample collection location). Also, the target coil size in this experiment is 0.35■X1
030 xC (the degree of adhesion flaws that occurs is significant) and 0
．． The size of the roll was 2s, 70mm x 919mm x C (the degree of adhesion flaws that occurred was light), and the work roll had a dull finish.

Figure 11 shows the degree of adhesion flaws occurring on the strip surface on the entry and exit sides when classified by grade (1st grade, 2nd grade, out-of-grade, scrap) and rank (A to F rank). It is a graph diagram showing changes in the quality rating of S) IJ whelk C11) at the sample collection location. In addition, 0-0 in the figure indicates a change in the quality rating when the target coil size is 0.35 m x 1030 cod x C and the auxiliary roller and reversing roller (to) are made non-contact. This shows the change when the strip α old drawn from the same size coil is pressed and simultaneously tilted toward the coil side as the diameter changes, and further) In -1, the auxiliary roller (to) and the reversing roller (to) are pressed against the strip I drawn from the same size coil, and at the same time the coil CI
It shows the change in quality rating when the auxiliary roller is moved to the G side and the reversing roller (to) is also made to follow it. On the other hand, o-o, w-w and [)
- [il shows the change in quality rating of IJ tube αυ when carried out in a state where only the target coil size is different from the above case (0.70x x 919m After passing through the work roll, the degree of scratches will be reduced, but the auxiliary roller (4)
In the case of using a reversing roller and/or a reversing roller, a reduction of 1 to 2 ranks was already achieved in the state of the input sample, demonstrating the effectiveness of the apparatus of the present invention.

The share is for actual machine operations using auxiliary rollers and reversing rollers.

The number of downgraded products due to adhesive defects (second-class products, non-first-class products, and products that will be scrapped) has decreased to about 115, which is the previous level. In addition, the number of downgraded products due to defects such as scratches, wrinkles on the edges, and bent corners has been reduced to 1/2 to 1/3 of the conventional level. These problems were caused by the incoming coil (1G) and adhesion of the edges, but by using this device, smooth unwinding and uniform tension distribution in the width direction were achieved. It is presumed that this was the cause of the problem.

〔Effect of the invention〕

As described in detail above, according to the tight annealed coil unwinding equipment of the present invention, the peeling position where the coil is peeled off into the strip can be forcibly aligned in the width direction, so that the coil in a close contact state can be unwound. Even in such a case, folding flaws due to buckling will not occur, and it is possible to reduce adhesion flaws.

Strictly speaking, the configuration of the present invention can be applied to any device having equipment for unwinding tight annealing coils, so it can also be applied to batch tempering mills, tempering mills combined with coil lines, and the like. In addition, it is possible to keep the distance between the peeling point where the coil peels off into the strip and the strip contact point of the auxiliary roller stable and quiet while rewinding it to the strip IJ tube. It is especially effective for scratches, etc. that occur. Furthermore, since it is thought that defects with unclear causes such as ear wrinkles and waist folds are caused by close contact, this effect is expected as shown in the above-mentioned embodiments.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the basic configuration of the present invention. Fig. 2 is a developed view showing the state of adhesion flaws that have occurred on the inner circumferential surface of the strip, Fig. 3 (a) is an oblique view showing an outline of the situation in which adhesion flaws occur when the coil is unwound, and Fig. 3 (b) ) is the same figure (a)
Figure 4 is a side view showing the state in which the peeling position is forcibly aligned using a peeling line stabilizing roll, and Figure 5 is a side view showing the condition in which the peeling line stabilizing roll is forcibly aligned. Fig. 6 is a front view of the coil unwinding equipment according to an embodiment of the present invention;
Figures (a) and (b) are explanatory diagrams showing the side surface and dry weather of the threading guide installed near the coil side, Figure 7 (a) (b)
An explanatory diagram of the other sheet threading guide. Figure 8 is a front view showing an example of use when the reversing roller is not used in the equipment of this embodiment, and Figure 9 is a front view showing an example of use when the reversing roller is not used in the equipment of this embodiment.
A front view showing the state where the J-tube is pulled out in an S-shape near the lid where the J-tube peels off, and Figure 10 is a diagram of an experimental rolling line in which the equipment of this example was installed on the entrance side of a two-stand temper mill and temper rolling was performed. An explanatory diagram showing the outline, FIG. 11 is a graph diagram showing changes in the quality rating of the strips obtained in this experiment. In the figure (IXloooloa) is the coil % (1a) Ql) is the strip, (211121 is the auxiliary roller, (3) (to) is the reversing roller % (100) is the temper mill, (110
) indicates each tension pry roll. Patent applicant: Nippon Kokan Co., Ltd. Inventor: Hiroshi Koga
Kiyodo Shimizu
Satoshi Kamase, Hidetoshi Sansei, Kei - Nori Takase, Patent Attorney, Masatoshi Yoshihara, Masatoshi Mioka, Masatoshi Tomabechi, Figure 3, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 9, Figure 10. Figure 11

Claims (1)

[Claims] 1. Unwound from the coil and peeled into strips It's a widthwise peeling line that forms where it's squeezed. on the strip advancing direction side, and It comes into contact with the outer circumferential surface of the strip near the disconnection. The feature is that an auxiliary roller is provided to Tight annealing coil unwinding equipment. 2. Tight annealing coil unwinding setup as described in the previous section In preparation, the diameter of the coil due to unwinding Move the auxiliary roller according to small changes so that this roller always The feature is that it can come into contact with a surface. The title set forth in claim 1 Annealed coil unwinding equipment. 3. Unwound from the coil and peeled off into strips It's a widthwise peeling line that forms where it's squeezed. on the side in the traveling direction of the wrist strip, and It comes into contact with the outer circumferential surface of the strip near the disconnection. and an auxiliary roller for said coil. Line up the auxiliary rollers with the auxiliary rollers roughly in between. The strip wraps around the roller and extends. Wrap the other side of the strip further and turn it around. A tag characterized in that it has a rolling roller. It is annealed coil unwinding equipment. 4. Tight annealing coil unwinding setup as described in the previous section In preparation, small changes in coil diameter due to unwinding With the development of move the auxiliary roller to ensure that the auxiliary roller is always Can contact the outer circumferential surface of the lip, and can also be reversed low. that La can follow this. The feature set forth in claim 3 is Tight annealing coil unwinding equipment.