JPH03285100A - Wringer roll - Google Patents

Abstract

PURPOSE:To improve the liq. squeezing performance of each pair of wringer rolls and to prolong the service life of the rolls by making the surface of one of rolls harder than that of the other. CONSTITUTION:A roll coated with a hard material is used as one of a pair of wringer rolls, e.g., the roll at the rear side of a strip and a roll coated with a soft material is used as the other, e.g. the roll at the front side of the strip. When three pairs of wringer rolls are arranged in the forward direction of a strip S, the hard roll A of the 1st pair is set under the strip S, the hard roll A of the 2nd pair on the strip S and the hard roll A of the last pair under the strip S. By this arrangement, satisfactory liq. squeezing performance can be obtd. at both the front and rear sides of the strip S.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ringer roll for removing (liquid squeezing) liquid adhering to both surfaces of a metal strip.

[Conventional technology]

Pickling line and annealing line for metal strips. Many ringer rolls are used in process lines such as cleaning lines and menki lines.

For example, rolling oil, rolling wear powder, and the like are attached to the surface of a copper strip (hereinafter referred to as a strip) after cold rolling, and if annealing treatment is performed as it is, quality defects will occur. Therefore, the rolling oil and the like are removed by cleaning in a cleaning section installed at the entrance section of the electrolytic cleaning line or the continuous annealing line.

This will be explained based on the electrolytic cleaning line shown in FIG. In the figure, reference numeral 1 denotes an unwinding machine, which unwinds the strip coil C and supplies the strip S to the line. A welding machine 2 welds the tail end of the leading strip and the tip of the trailing strip. Next, the strip S is electrolytically cleaned in an alkaline cleaning tank 3 to remove dirt such as rolling oil on the surface. As the alkaline cleaning liquid, for example, a sodium orthosilicate aqueous solution having a concentration of about 3% is used. After that, it is brushed in a scrubber tank 4 having a brush roll to physically remove residual dirt and alkaline liquid, and then washed in a washing tank 5. Next, after being dried in a dryer 7, it is wound up into a coil by a winding machine 9.

In addition, when this coil reaches the specified size, the
The strip is cut by 8 and the winder 9 forms the next new coil.

The ringer rolls indicated by 1oa-10d in FIG. The liquid is squeezed out and the liquid is not carried out to the subsequent stage. In particular, the ringer roll 10d provided at the rear end is provided with a plurality of pairs of ringer rolls each consisting of a pair of rolls, thereby greatly enhancing the liquid removal function (liquid squeezing ability). These ringer rolls loa~1
In order to obtain good liquid squeezing properties, Od usually has a structure in which an iron core 1) is lined with rubber 12, as shown in FIG.

[Problem to be solved by the invention]

As mentioned above, ringer rolls are generally lined with soft rubber (hereinafter referred to as rubber rolls) in order to improve the liquid squeezing ability. It is difficult to say that it is. That is, if it becomes possible to further improve the liquid squeezing properties, it is possible to improve the lacquer consumption by reducing the amount of alkaline cleaning liquid carried out, for example. Furthermore, when a plurality of tanks containing different chemical solutions are arranged in series, the chemical solution taken out from the former tank mixes into the latter tank, making it possible to slow down the rate at which the chemical solution in the latter tank deteriorates. Furthermore, various effects can be obtained, such as the ability to reduce the amount of heat input for drying with a dryer, thereby saving energy.

In addition, the rubber roll suffers significant abrasion due to contact with the strip, and the liquid squeezing property rapidly decreases, so there is a problem that good liquid squeezing property cannot be maintained for a long period of time.

Furthermore, due to slinting, trimming, etc., there may be minute sagging, fractured surfaces 1) b, and firmness 1) c at both ends of the strip S in the width direction, as shown in Figure 8. In particular, burrs may cause fine cut flaws on the roll surface. Once cut flaws occur on the roll, these flaws grow while the roll is being used, and the liquid penetrates into these flaws, deteriorating the liquid squeezing property.
Blisters are formed in the roll, leading to delamination of the rubber lining layer, which can even lead to strip breakage and even line stoppage.

Therefore, for the purpose of improving the abrasion resistance and cut resistance of the Ringer roll, the Ringer roll of Utility Model Application Publication No. 133808/1983 was subjected to 'tl='l-. This is intended to extend the life of the roll by incorporating tangible ceramics into the surface layer of the rubber lining layer. However, in reality, it is difficult in manufacturing to uniformly contain tangible ceramics in the surface layer of the elastic layer, and the ceramics may be exposed on the roll surface or conversely buried in the elastic layer.

Therefore, there are problems in that the exposed ceramics fall off, or only the elastic layer portion wears out prematurely, causing unevenness on the roll surface and deteriorating the liquid squeezing property.

The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a ringer roll that has good liquid squeezing properties and can extend the life of the roll.

[Means to solve the problem]

The ringer roll of the present invention is characterized in that at least the surface of one of the pair of rolls constituting the ringer roll is made harder than at least the surface of the other roll.

It is desirable that each of the pair of rolls is constructed by coating the surface of a core material with a coating such as a resin, and that the coating on one roll is harder than the coating on the other roll.

It is preferable that the surface of the roll having a hard surface and the Young's modulus of the hard coating be 10 to 4000 kgf/Tsuru2.

[Effect]

An experiment was conducted on liquid squeezing property using the experimental apparatus shown in FIG. In the figure, 21 is a tank containing water, 22a
, 22b are rolls, and a pair of these rolls constitute a ringer roll, which is installed above the water tank 21, and pulls up the strip S immersed in the water tank 21 and squeezes it with the ringer roll. The thickness of the liquid film on the strip S after the treatment was investigated. Here, when pressing the ringer roll, the load is 10.0 kg/co+ in linear pressure conversion, and t
child.

In addition, from the viewpoint of manufacturing aesthetics, the ringer roll was made of an iron core coated with the following material, but in this invention, the hardness and softness of the surface of the pair of rolls that make up the ringer roll is the most In this respect, the internal structure of the roll does not matter.

For this reason, the present invention includes those constructed of the same material from the surface to the inside. As a result of the roll being made of the same material from the surface to the inside, if the roll is insufficient in rigidity, a known backup roll may be used. The following describes the case described above in which the iron core is coated with the following material, but it is recognized that similar results can be obtained with a roll made of the following material even inside.

When the results obtained from the above experiment were organized in terms of Young's modulus, Figure 2 was obtained. The materials indicated by the symbols in the figure are as follows.

CR・・・・・・・・・・・・Neoprene rubber P
E (LD)...Polyethylene (low density) PE (H
D)...Polyethylene (high density) PTFE...
...Tetrafluoroethylene resin PA...
・・・・・・Polyamide resin ABS・・・・・・・・・
... Acrylic-butadiene-styrene copolymer PF ... Phenol resin E
P・・・・・・・・・・・・Epoxy resin In the same figure, the vertical axis is the liquid film thickness (μm), and the horizontal axis is Young’s modulus (kgf/am
” ), and all plotted points are the average values of the data locations.As a result, the harder the material, the better the liquid removal properties, and the Young's modulus of 0.5 to 2 kgf.
/ Young's modulus is 10k compared to the rubber material (CR) of Tsuru 2.
It can be seen that hard materials with a hardness of gf/mm" or higher have much better liquid drainage properties.

As described above, it has been found that the harder the ringer roll coating material is, the better the liquid squeezing property is, but there is a limit to the degree of hardness. That is, there are two types of strips: dull material with a large surface roughness and bright material with a small surface roughness, and especially for the latter, gloss is an important control factor. Usually, the surface roughness of bright material is 0.2 μm or less in Rwax (about 0.05 μm in Ra). Therefore, when the liquid film thickness is reduced to 0.2 .mu.m or less using a ringer roll, the ringer roll and the convex portion of the strip come into direct contact, which may cause surface flaws such as scratches and push scratches on the strip. Note that, from FIG. 2, the liquid film thickness is 0.2 μm when the Young's modulus is 4000 kgf/am”.

From the above, in this invention, the surface of the ringer roll is made of the same material from the surface to the inside, and the core material is coated with a coating material.
The Young's modulus was assumed to be lO~4 (100 kgf/me2).

Also, if you replace the conventional rubber material with a hard material, it will be more wear resistant.

Since it is expected that cut resistance will also improve, a wear resistance test was conducted. The results are shown in FIG. 3, where the horizontal axis shows Young's modulus and the vertical axis shows the wear ratio when the wear loss (■-) of the rubber material (CR) is set to 1.0. According to the same figure, the Young's modulus is 10 to 400.
When using a material with 0 kgf/mm, the amount of wear of the rubber material is 4
It can be seen that the amount of wear is reduced to less than one-fold.

Therefore, we conducted a confirmation experiment using an actual machine using a ringer roll that is harder than a rubber roll. As a result, I found out about the clothes. That is, in the width direction of the strip, it was found that the liquid drainage properties at the center part were very good, but the properties at both ends were insufficient. The reason is presumed to be as follows.

That is, as shown in FIG. 4(a), since the roll is hard, the amount of elastic deformation of the roll is small, and the strip S
It is thought that a gap δ is formed at both ends of the strip S, from which the liquid flows around to both ends of the strip S. On the other hand, in the case of a conventional rubber roll, as shown in FIG.

Therefore, as shown in FIG. 4(C) (corresponding to the present invention), the roll on the back side of the strip is a hard material coated roll,
The roll on the surface side of the strip was a soft material coated roll.

This not only prevents the liquid from going around, but also greatly improves the liquid squeezing property on at least one side of the strip (hard roll side), and greatly extends the life of the roll. Furthermore, if a hard roll is used on the back side of the strip, that is, on the side where the cracks are present, there is no risk of cut flaws (
Of course, since there are no holes on the strip surface side, no cut flaws will occur on the soft roll on the strip surface side), and therefore the life of the soft roll can be extended.

When this invention is applied to multiple ringer rolls,
As shown in FIG. 5, the positional relationship with respect to the strip S of a hard roll A and a soft (rubber) roll B constituting a ringer roll is switched. That is, the first ringer roll in the traveling direction of the strip S uses the hard roll A as the bottom surface of the strip S, the next ringer roll uses the hard roll A as the top surface of the strip S, and the last ringer roll uses the first ringer roll as the top surface of the strip S. Similarly, the hard roll A is used as the lower surface of the strip S. By arranging them in this way, good liquid squeezing properties can be obtained on both the front and back surfaces of the strip S, and the life of the roll can be extended. In this case, since a soft roll is always arranged on the back side of the strip S, there is a concern that cut flaws may occur, but the present invention works advantageously even in this case. That is, since the strip S has already been subjected to liquid squeezing in the first ringer roll, there is no problem even if the liquid squeezing property deteriorates to some extent in the subsequent stage. ) Since liquid squeezing is performed by a hard roll from the bottom surface, the cracks appearing on the lower surface are corrected to the extent that they are caused by the hard roll, and from this point of view as well, the cut area of the soft roll at the subsequent stage is reduced.

[First Example] A ringer roll (1 in Fig.
This invention was applied to 02).

The upper roll is made of neoprene rubber, and the lower part is coated with epoxy resin.The roll dimensions are outer diameter 400mm and length 1.
320 ++n. As a result, the ringer roll, which conventionally had to be replaced every one month, can now be replaced approximately every three months.
Even after several months have passed, good squeezing properties have been maintained, and the amount of sodium orthosilicate used has been reduced by approximately 2%.

[Second Embodiment] This invention was also applied to the ringer roll (see 10d in Fig. 6) in front of the dryer in the electrolytic cleaning line, and the ringer roll was arranged as shown in Fig. 5. The same effect as in Example 1 was obtained. Although the dryer uses hot air, the strip S can be sufficiently dried even if the amount of hot air is reduced by about 10%. I was able to do that.

Furthermore, no flaws were caused in the strip S in any of the above examples.

Although both rolls in the above embodiments are constructed by coating the surface of the core material with a coating, it goes without saying that they may be constructed of the same material from the surface to the inside. be. Furthermore, although these embodiments apply the present invention to an electrolytic cleaning line, the present invention
Of course, the ringer roll of the present invention can also be used in the cleaning section or water cooling zone of a continuous annealing line, or in the ringer roll of a pickling line, menki line, etc.

Furthermore, although both of the embodiments described above apply the present invention to a horizontal bus, it goes without saying that the present invention can also be applied to a vertical path.

〔Effect of the invention〕

As explained above, according to the present invention, at least the surface of one of the pair of rolls is made harder than at least the surface of the other roll, so that the liquid squeezing property and the roll life can be improved. At the same time, it has the effect of improving the basic unit of chemical solution, reducing energy and maintenance costs, and further improving product yield.

Further, if both rolls are constructed by coating the surface of the core material with a coating such as resin, and the coating on one roll is made harder than the coating on the other roll, the rolls can be manufactured easily. It can be easily applied to rolls of various diameters.

In particular, the Young's modulus on the surface of a hard roll is 1O ~ 400.
When it is set to 0 kgf/+u'', the above-mentioned improvement in liquid squeezing property and roll life becomes remarkable.

[Brief explanation of the drawing]

Figure 1 is a front view showing an example of the use of a ringer roll, Figure 2 is a graph showing the relationship between the liquid film thickness and Young's modulus in the coating material of the ringer roll, and Figure 3 is the amount of wear in the coating material of the ringer roll. Graph showing the relationship between the ratio and Young's modulus, Figure 4 (a) is an explanatory diagram showing the relationship with the strip when both rolls of the Ringer roll are made of hard material, Figure 4 (b) is the relationship between the ringer roll and the Young's modulus. An explanatory diagram showing the relationship with the strip when both rolls are made of soft material, Fig. 4 (
C) is an explanatory diagram showing the relationship with the strip of the present invention, FIG. 5 is an explanatory diagram showing the arrangement of hard rolls when multiple ringer rolls are used, FIG. 6 is an explanatory diagram of the electrolytic cleaning line, FIG. 7 is a sectional view of one of the rolls constituting the ringer roll, and FIG. 8 is an enlarged sectional view of the strip. S... Strip, 10a-10d... Ringer roll.

Claims (3)

[Claims] (1) In a ringer roll that consists of a pair of rolls and pinches the strip from both sides and drains the liquid from these sides,
A ringer roll characterized in that at least the surface of one of the pair of rolls is made harder than at least the surface of the other roll. (2) Each of the pair of rolls is characterized in that the surface of the core material is coated with a coating such as resin, and the coating on one roll is made harder than the coating on the other roll. 1st
A ringer roll according to the claims. (3) The Ringer roll according to claim 1 or 2, wherein the surface of the hard surface of the roll has a Young's modulus of 10 to 4000 kgf/mm^2.