JPH11290923A - Transfer roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high coefficient of friction even under a condition that the surface of an object to be transferred is wet by an oil film, etc., to have wear resistance and edge-cut resistance, to be free from boundary peeling between mandrel and the transfer roll, and further to display a sufficient transfer force. SOLUTION: The transfer roll is equipped with mandrel 1, solid rubber layer 4 formed on the peripheral surface of this mandrel 1 and whose main component is nitril rubber hydride containing nitril rubber hydride and zinc methacrylate, and micro porous layer 3 formed on this solid rubber layer 4 and whose main component is nitril rubber hydride containing nitril rubber hydride and zinc methacrylate, whose JIS-E hardness is 80 or over and whose expansion ratio is 1.2 to 1.8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a transport roll,
Particularly, the present invention relates to a bridle roll for transporting a continuous steel plate or the like in an iron making process.

[0002]

2. Description of the Related Art As is well known, in a steel making process, various treatments are performed while a continuous steel sheet is transported and transported by transport rollers. Here, the transport roll needs to have abrasion resistance to an object to be transported, such as a steel plate, and a friction coefficient for maintaining a tension required for continuous transport of the steel plate, etc.

Conventionally, chloroprene rubber, urethane rubber or the like has been used as a material of a transport roll used for industrial use, mainly for iron making. However, conventional conveying rolls did not provide sufficient conveying force. In order to make a conveyed object such as a steel plate run smoothly and continuously, it is necessary to cut off the oil film on the surface and contact the transfer roll with the steel plate. Various attempts have been made to develop a transport roll having a roll.

In JP-A-63-280912, an oil film or the like is cut by forming a roll surface layer from liquid urethane rubber mixed with a nonwoven fabric and projecting the nonwoven fabric on the roll surface to make the surface uneven. A roll having an improved friction coefficient is disclosed.

Japanese Patent Application Laid-Open No. 3-181609 discloses that a roll having a high coefficient of friction is obtained by improving a nonwoven fabric and forming a nonwoven fabric layer having closed cells on the roll surface.

However, both of these rolls have not been able to provide a sufficient conveying force. Actually, in order to obtain a high friction coefficient, the surface of these rolls is polished with a cutting tool or the like to obtain a rough surface, that is, creping is performed. But,
Even with such processing, there is a problem in that the surface irregularities decrease due to wear with the lapse of use, and the transport force is reduced. Further, when the steel sheet is conveyed, cuts and edge cuts occur on the roll surface due to the edge of the steel sheet, which poses a problem.

As another transport roll, a porous roll using a porous layer (sponge layer) as a surface layer is conceivable besides providing a nonwoven fabric on the surface. According to such a porous roll, the oil film is scraped off by the unevenness of the sponge, so that the sponge has a high coefficient of friction. Further, even if worn, the same surface appears, so that a decrease in the coefficient of friction due to use can be prevented.

However, sponges generally have not been put to practical use because of their small physical properties and poor abrasion resistance. Further, the rubber roll in use receives the greatest force near the core metal due to its deformation. For this reason, the roll of the porous layer, whose contact area with the core metal is smaller than the solid layer due to bubbles in the rubber layer,
Interfacial peeling is likely to occur near the core metal, making it inferior in durability and unusable.

[0009]

A first object of the present invention is to provide at least one solid rubber layer having a predetermined composition and a predetermined composition, hardness and expansion ratio formed on the solid rubber layer. By adopting a configuration having a surface porous layer, a high coefficient of friction can be obtained even under conditions where the surface of the transferred object is wet with an oil film or the like, and a high coefficient of friction can be maintained even if abrasion occurs. Another object of the present invention is to provide a transport roll having abrasion resistance and edge cut resistance.

[0010] A second object of the present invention is to provide a transport roll in which a solid rubber layer is interposed between a cored bar and a microporous surface layer, so that interface peeling near the cored bar is less likely to occur. To provide.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a metal core and a solid rubber layer formed on the peripheral surface of the metal core and mainly composed of hydrogenated nitrile rubber and hydrogenated nitrile rubber containing zinc methacrylate. A microporous material formed on this solid rubber layer and mainly composed of hydrogenated nitrile rubber and hydrogenated nitrile rubber containing zinc methacrylate, having a JIS-E hardness of 80 or more and an expansion ratio of 1.2 to 1.8. And a transport roll.

In the present invention, the hardness of the solid rubber layer is preferably 60 to 90 in JIS-A hardness. The reason is that if the hardness is less than 60, the physical properties of the rubber will be low, and if the hardness is more than 90, the processability of the rubber will be reduced. Further, in order to further improve the adhesion to the core metal, at least one or more lower winding layers may be provided between the solid rubber layer and the core metal.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transport roll according to the present invention has, for example, a form as shown in FIGS. 1 has a configuration in which a solid rubber layer 4 and a microporous layer 3 are sequentially formed on the peripheral surface of a cored bar 1. Here, it is desirable that the solid rubber layer 4 has the same main component in consideration of the adhesiveness to the microporous layer 3. Therefore, the solid rubber layer 4 is mainly made of a hydrogenated nitrile rubber and a hydrogenated nitrile rubber containing zinc methacrylate. And JIS-A hardness 60-9
0. On the other hand, the microporous layer 3 is mainly composed of a hydrogenated nitrile rubber and a hydrogenated nitrile rubber containing zinc methacrylate, and has a JIS-E hardness of 80 to 95 and an expansion ratio of 1.2 to 1.8. The transport roll of FIG. 2 has a configuration in which the lower winding layer 2 is interposed between the solid rubber layer 4 and the cored bar 1. Here, the lower winding layer 2 was formed using nitrile rubber having excellent mechanical properties and adhesiveness.

FIG. 3 shows a conventional transport roll for comparison with the transport roll of the present invention, which has a structure in which a sponge layer 5 as a surface layer is formed on the peripheral surface of the cored bar 1. In the present invention, the hardness of the microporous layer is 80 or more in JIS-E hardness, and more preferably 80 to 95.
This is because if the hardness is lower than this, the physical properties are reduced and the roll cannot be used.

Further, the foaming ratio of the surface porous layer is 1.2 to
By setting it to 1.8, if the size of the cells forming the microporous layer is large as in the case of ordinary sponge rubber, the gripping force will be high but it will be easy to wear. As a result, it is possible to solve the problem that the ability of the transported object to scrape the liquid is insufficient, and as a result, the friction coefficient is reduced and slip is likely to occur.

In the present invention, the micro-porous layer is mainly composed of a hydrogenated nitrile rubber and a hydrogenated nitrile rubber containing zinc methacrylate. , A vulcanizing agent, a filler and the like may be optionally added.

[0017]

Hereinafter, Examples 1, 2, and 3 of the present invention will be described together with Comparative Examples 1 to 5. The transport rolls according to the first and second embodiments have, for example, a configuration in which a solid rubber layer 4 and a microporous layer 3 are sequentially formed on the peripheral surface of an iron core 1 as shown in FIG. On the other hand, the transport rolls according to Comparative Examples 1 to 3 have, for example, a configuration in which a sponge layer 5 as a surface layer is formed on the peripheral surface of the iron core 1 as shown in FIG. Although not shown, the transport roll according to Comparative Example 4 has a configuration in which a solid rubber layer is formed as a surface layer instead of the sponge layer of Comparative Example 1. Comparative Example 5
Although not shown, the transport roll according to (1) has a configuration in which a urethane rubber layer containing a nonwoven fabric is formed as a surface layer instead of the sponge layer of Comparative Example 1.

Table 1 below shows the composition of each component of the surface porous layer (or surface layer) according to Examples 1, 2 and 3 and Comparative Examples 1 to 5. Table 2 below shows the results of Examples 1 and 2 described above.
2 shows the results of performing characteristic tests on the microporous layer (or surface layer) according to Comparative Example 2 and Comparative Examples 1 to 5.

[0019]

[Table 1]

[0020]

[Table 2]

However, the friction measurement, the wear measurement, and the scratch test were performed as follows. (1) Measurement of Friction As shown in FIG. 4, a stainless steel plate was wound around the rubber roll 11 at 90 degrees, and it was pulled by a spring, and the tension at that time was read and determined based on the following Euler's formula.

Μ = (1 / φ) · ln (T / W) where φ: winding angle (π / 2), T: reading value of spring only, W: weight of weight 12, and conditions at this time Is a metal plate: SUS plate, width 25 mm, thickness 0.03 mm Roll size: φ16 × φ40 × L30 Apply oil (DOS) to the SUS plate (2) Wear measurement Sandpaper with weight 12 as shown in Fig. 5 (Trade name: Riken Corundum AA-150, manufactured by Riken Corundum Co., Ltd.) was wound around the take-up roll 13 at 90 degrees, and the roll was rotated at a constant speed for a certain period of time to determine the wear volume. At that time, the sandpaper was moved at a constant speed. The conditions at this time are as follows.

Roll rotation speed: 100 rotations / min, test time: 5 h, sandpaper: 15 mm width Roll size: φ16 × φ40 × L20 (3) Scratch test A wire with a weight as shown in FIG. And the roll was rotated at a constant speed for a certain period of time, and the roll was wound. The depth of the groove was measured. The condition at this time is as follows: load: 30
0 g, rotation speed: 200 rpm, time: 1 h.

According to Tables 1 and 2, when the microporous microporous layer according to Examples 1, 2 and 3 is used for a transport roll, the required properties of the transport roll, ie, abrasion resistance, high friction coefficient, and scratch resistance. It was confirmed that the powder had an average high performance. On the other hand, when the surface layer according to Comparative Examples 1 and 2 was used for the transport roll, the friction coefficient was high because the sponge layer was used as the surface layer, but the hardness or the expansion ratio did not satisfy the requirements of the present invention. Poor abrasion resistance and scratch resistance. In the case of the transport roll of Comparative Example 3, a high friction coefficient is obtained,
Poor abrasion resistance due to small physical properties. In the case of the transport roll of Comparative Example 4, since the solid rubber layer was used as the surface layer, the wear resistance was good, but the frictional force was poor. In the case of the transport roll of Comparative Example 5, since the urethane rubber layer containing the nonwoven fabric is used as the surface layer, the surface has irregularities and the frictional force on the wet surface is good, but the surface is irregular, so that it is easily worn. When the surface processing is lost, the frictional force decreases.

Next, a transport roll was formed using the microporous layer according to Example 1, and a roll rotation test was performed. The transport roll according to the present invention can be manufactured by a usual rubber roll forming method. That is, for example, after blasting an iron core (core metal) and then applying an adhesive to the iron core,
A lower roll layer, a solid rubber layer, and a microporous surface layer of the composition described are sequentially wound around an iron core, vulcanized and polished to produce a transport roll.

As shown in Table 4, the structure of Embodiment 1 is as follows.
-1 is a two-layer structure of a solid rubber layer and a microporous surface layer, Example 1-2 is a three-layer structure of a lower winding layer, a solid rubber layer and a microporous surface layer, and Comparative Example 1-3 is a microporous surface It has a single-layer structure of only layers. Here, the roll size is 2
It is 10 × 240 × 300 mm. Roll rotation test
The linear pressure was set to 20 kgf / cm and 30 kgf / cm, respectively, in accordance with the general bridle roll use conditions. The results of the rotation test are as shown in Table 5 below. In Table 5, “○” indicates that no interfacial peeling occurred.
“X” indicates that interfacial peeling occurred.

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

[Table 5]

According to Examples 1-1 and 1-2, by providing a solid rubber layer or a solid rubber layer and a lower winding layer between the cored bar and the microporous layer, a transport roll having good durability can be obtained. Was done. On the other hand, in the case of a single layer consisting of only the sponge layer as in Comparative Example 1-3, it was found that interfacial peeling occurred between the sponge layer and the cored bar, and that the sponge layer could not be used for a high tension transport roll.

In fact, when the transport roll according to the present invention was used as a bridle roll in a sheet processing line of a cold rolling mill (operating speed: max 500 m / min), the transport roll according to the present invention showed a frictional force on the roll surface, Wear resistance,
It was confirmed that the roll satisfies all favorable results regarding the scratch resistance against the edges of the steel sheet and the edge cut resistance, and that it is a durable roll.

[0032]

As described in detail above, according to the present invention, at least one solid rubber layer having a predetermined composition and hardness, and a predetermined composition, hardness and
1) High friction coefficient is obtained even under the condition that the surface of the conveyed object is wet with oil film etc., and the abrasion resistance and edge cut resistance 2) It is possible to provide a transport roll that can maintain a high coefficient of friction even if abrasion occurs, and that is less likely to cause interfacial separation near a cored bar.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a transport roll illustrating one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a transport roll showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional transport roll,

FIG. 4 is an explanatory diagram of a friction measurement of a roll.

FIG. 5 is an explanatory diagram of measurement of roll wear.

FIG. 6 is an explanatory diagram of measurement of roll scratching.

[Explanation of symbols]

 1 ... core metal, 2 ... lower winding layer, 3 ... microporous layer, 4 ... solid rubber layer.

Claims (3)

[Claims] 1. A core metal, a solid rubber layer formed on the peripheral surface of the core metal and mainly composed of hydrogenated nitrile rubber and hydrogenated nitrile rubber containing zinc methacrylate, and formed on the solid rubber layer. And a hydrogenation nitrile rubber containing hydrogenated nitrile rubber and zinc methacrylate as main components, having a JIS-E hardness of 80 or more and an expansion ratio of 1.2 to 1.8.
And a microporous layer of the above. 2. The solid rubber layer has a hardness of JIS-A.
The transport roll according to claim 1, wherein the hardness is 60 to 90. 3. The transporting roll according to claim 1, wherein at least one or more lower winding layers are provided between the solid rubber layer and the cored bar.