JPH0599574A - Disk roll and fabrication thereof - Google Patents

Abstract

PURPOSE:To provide a disk roll having excellent heat resistance and wear resistance as well as a proper magnitude frictional coefficient by forming a sheet by heating and compressing a mixture composition where rubber chemicals, etc., are added in particular inorganic fibers, etc., and forming a disk raw material by blanking the sheet. CONSTITUTION:In a roll for a bridle roll, a fired disk 1 is fitted to a shaft 2 having a cooling water hole 2 and a rock nut 4 is tightened through a retainer ring 3. In this case, a disk raw material of the disk roll is formed by blanking a sheet which is yielded by heating and compressing inorganic fibers having no shaft excepting asbestos fibers or 20-80wt.% of the foregoing inorganic fibers and organic fibers and a mixture composition of rubber chemicals and a filler into 10-30wt.% rubber. Upon manufacture, the sheet blanked into the foregoing disk is fired at about 200 deg.C, and the fired disk 1 is inserted and fitted to many sheet shafts and it is after compressed and fixed, surface-polished.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a disk roll used in a continuous heat treatment process for thin plates such as plate glass, stainless steel, steel, copper and brass.
The present invention relates to a disc roll having both wear resistance and a moderate friction coefficient and a method for producing the disc roll.

[0002]

2. Description of the Related Art Conventionally, a heating furnace of a continuous annealing facility is used for heat treatment and heat treatment of a thin plate such as plate glass or stainless steel or steel. The bridle device rolls and steering rolls for tracking devices connected to this are affected by the heat of the annealing furnace, and the inlet side and outlet side of the device due to the thermal expansion of the strip (thin plate) heated in the continuous annealing furnace. It is necessary to have excellent heat resistance and an appropriate coefficient of friction in order to adjust the rapid change in the tension between and to center the deviation of the strip in the continuous furnace and to convey the strip reliably without slipping. is there.

Further, in order to reduce the frequency of replacement due to the reduction of rolls due to friction with the strip, excellent wear resistance is required. That is, the heat treatment roll,
A material having at least heat resistance, wear resistance, and a friction coefficient of an appropriate size is a condition.

Up to now, for the purpose of satisfying the above conditions,
Various rolls have been proposed and put into practical use. As one of them, Japanese Patent Publication No. 58-58415 discloses a roll disk material which is made by taking out the heat resistance of an asbestos joint sheet and punching it out in an annular shape. The asbestos joint sheet used for this is the Japanese Industrial Standard (J
IS) As specified in R3453, asbestos fibers are mixed in a weight ratio of 65% or more and 10% or more with rubber, a vulcanizing agent, and other compounds or fillers, and heated to a dense and uniform cardboard shape. It is compressed.

Further, asbestos fibers are used,
A small amount of an organic or inorganic adhesive is mixed with asbestos fiber and dispersed in water to make a paper, and then a dried asbestos board is punched out in an annular shape to form a roll disc material. It is disclosed in the publication.

Further, asbestos fiber and wollastonite fiber are mixed with an organic or inorganic binder and dispersed in water to make a paper, and then the dried asbestos board is punched into an annular shape to form a roll disc material. What was done
It is disclosed in Japanese Patent No. 684.

[0007]

However, in each of the above-mentioned disc rolls, since the main component forming the disc material is asbestos fiber (chrysotile asbestos), it is inserted into the roll shaft. When the roll surface is cut and finished after being compressed and fixed, dust of the asbestos fibers that have been scraped off is scattered in the air. In addition, when used as a roll for continuous annealing equipment, the roll surface is constantly in contact with the strips and is worn away, and dust of asbestos fibers is scattered in the air. If such a worker inhales such dust, there is a problem that it may cause health problems.

[0008]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned current situation.
It is an object of the present invention to provide a disk roll having excellent heat resistance, abrasion resistance, and a moderately large coefficient of friction over conventional rolls without using asbestos fibers, and a method for producing the same.

[0009]

The first invention of the present application is to provide shotless inorganic fibers except asbestos fibers or 20 to 80% by weight of inorganic fibers and organic fibers and 10 to 30% by weight of rubber, and a rubber chemical and The gist is that a disc material is obtained by punching out a sheet obtained by heating and compressing a mixed composition containing a filler. The second invention of the present application is the inorganic fiber having no shot except asbestos fiber or this inorganic fiber and organic fiber 20 to 80% by weight, rubber 10 to
A mixture composition obtained by adding a rubber chemical and a filler to 30% by weight is heated and compressed into a sheet, punched into a disc shape, and fired at about 200 ° C. A number of the fired discs are inserted into a shaft and compressed. The idea is to fix and grind the surface.

[0010]

According to the above mixed composition, desired heat resistance,
A disk roll having abrasion resistance and an appropriate friction coefficient is constructed. Further, since the inorganic fibers and the organic fibers having no hard shots (grains) are used, there is no possibility of damaging the strip surface.

[0011]

EXAMPLES Details of each compound such as inorganic fibers having shots other than asbestos fibers used in the present invention, organic fibers, rubber, fillers, etc. are shown below.

(1) Inorganic fibers: Glass fibers, carbon fibers, ceramic fibers, rock wool, potassium titanate fibers, tyranno fibers, whiskers, etc., without shots (grains).

(2) Organic fibers: aramid fibers, polybenzimidazole fibers (PBI), pulp, etc., 20
It is preferable that the fibers do not shrink and shrink at 0 ° C or higher. Further, it is preferable to use two or more kinds of the fibers in combination. The total amount of the above-mentioned inorganic fibers and organic fibers is preferably in the range of 20 to 80% by weight (inorganic fibers 10% by weight or more and organic fibers 10% by weight or less). The amount of fiber material that deteriorates increases, and the roll becomes rough and becomes brittle. On the other hand, if the amount is too small, defects such as the entanglement with the inorganic fibers when the inorganic fibers are used alone (the inorganic fibers are rigid and the entanglement between the fibers are poor), and the roll becomes hard and brittle.

(3) Rubber: NBR, SBR, NR, EP
There are DM and the like, and two or more kinds may be combined. Also,
Either sulfur vulcanization or sulfur-free vulcanization may be used, but sulfur-free vulcanization is preferred. The compounding ratio is 10 to 30% by weight, which is a desirable range for obtaining a strong bond. If the amount is less than this, the disc becomes brittle, and if it is more than this, the heat resistance is poor.

(4) Filler: Motoyama Kibushi, Hara Kibushi, and Iga Kibushi clay containing a large amount of fulvic acid are preferable. When these clays are used, they are hardened when the disc is fired, fiber and rubber,
The filler is strongly bonded. Therefore, the roll disk does not crack in a practical state. The fulvic acid in Kibushi clay is an initial product of the humification process, and part of the fulvic acid is transferred to humic acid with the release of oxygen during the humification process.

Next, specific examples of the present invention will be shown below together with comparative examples.

Example 1 10% by weight of carbon fiber, 9% by weight of glass fiber, and 8% by weight of aramid fiber were opened with a high-speed opening machine for 5 minutes, and 11% by weight of SBR and 2% by weight of NR were mixed with a rubber mastic roll. Thoroughly kneaded in 0.4mm thick, and soaked in toluene for 24 hours to swell and uniformly stir and mix the rubber chemicals to form a rubber paste, and Motoyama Kibushi clay 32% by weight And 24% by weight of kaolin clay were put into a stirring tank and mixed by stirring for 15 minutes.

Next, this was transferred to a closed can and cooled by curing in a curing chamber at 25 ° C. for 24 hours, and the mixture was calendered with a hot roll at 130 ° C. and a cold roll at 30 ° C. to a thickness of 3.0 mm. A sheet with a density of 1.9 g / cm ³ was made, punched into a donut shape with an outer diameter of 300 mm and an inner diameter of 200 mm, and placed in a furnace filled with nitrogen gas and controlled at 200 ° C.
The disc was baked for 0 minutes to obtain a disc.

A roll for a bridle device shown in FIG. 1 was produced by using the above-mentioned firing disk. In the figure, 1 is a firing disk, 2 is a shaft, 2'is a cooling water hole, 3 is a retainer ring, and 4 is a lock nut. In addition, disk 1
64 sheets were inserted while changing the fiber direction by 90 degrees for each sheet and compressed with a force of 14 Ton via a tightening ring. Similarly, up to the full roll shaft (1200
mm) Disc insertion and compression were repeated and finally fixed with a lock nut. This is a long lathe and grinder with an outer diameter of 296 mm
Then, a bridle roll having a density of 2.09 g / cm ³ was manufactured.

[Examples 2 to 3] The same processes as in Example 1 were carried out. Table 1 shows the ingredients.

[0021]

[Table 1]

Comparative Example 1 48% by weight of asbestos fibers, 50% by weight of wollastonite, and 2% by weight of starch were uniformly dispersed in 50 times the amount of water, and paper was made up using a reticulated paper making machine.
It was dried in a dryer at 0 ° C. until the water content became 5% or less, and an asbestos board having a thickness of 3.0 mm and a density of 0.95 g / cm ³ was obtained. This is fitted and fixed to the shaft by the same means as in Example 1,
The outer diameter was finished to 296 mm, and a bridle roll having a density of 1.4 g / cm ³ was manufactured.

[Comparative Example 2] A roll manufactured according to the method described in JP-B-58-58415. Table 2 shows the amount of wear and the dusting test results when the rolls of Examples 1 to 3 and Comparative Examples 1 and 2 were applied by the wear tester shown in FIG.

[0024]

[Table 2]

In FIG. 2, A is a test roll, 5
Is a steel strip, 6 is a weight, 7 is a belt, 8 is a motor, 9 is a dust collector, and 10 is a thermocouple.

Dust generation test: The amount of asbestos dust generated is 1976
Based on July 18th, 2013, No. 383 (Certification standard based on the provisions of Article 6 Paragraph 1 of the specialization rule), the dust collection sample heads were installed at three locations around the roll at a distance of 50 cm. It was

Collection method: A sample holder for asbestos manufactured by Shibata Kagaku Co., Ltd. and the same 1P-20 type suction pump, an AAWG-02500 filter manufactured by Millipore, a suction rate of 5 liters / minute, a suction time of 30 minutes, and a suction air volume of 150 liters are generated. Asbestos dust was collected, and the asbestos dust generation amount was measured according to the Japan Asbestos Association (method of measuring the concentration of asbestos dust in indoor environments). The asbestos dust analysis and counting conditions are shown in Table 3.

[0028]

[Table 3]

Here, the specific evaluation of the present invention will be described below.

Hygiene resistance: Asbestos fiber hygiene problems are eliminated. Asbestos fibers are finished to a specified outer diameter through a cutting and grinding finishing process after roll forming, but asbestos fibers have stronger tensile strength than steel, so some asbestos fibers that cannot be cut after grinding remain on the roll surface. It is in a state of popping out like a beard. While it is being rubbed against the strip during use, it is cut and floats in the air. This is inhaled by workers and causes a health and health hazard. On the other hand, in the present invention, instead of asbestos fibers, inorganic fibers,
Since it uses organic fibers, it does not cause any health problems for workers.

Anti-strip attack: Asbestos fibers are layered in the natural serpentine. This rock is excavated and ground by a mill, so the rock is mixed. As a result, if this host rock emerges on the surface of the asbestos roll disc, it will scratch the strip surface. In the present invention, since inorganic fibers or organic fibers having no hard shots (grains) other than asbestos fibers are used, the strip surface is not damaged.

Abrasion resistance: In an inert atmosphere such as nitrogen gas at 200 ° C. or lower, a crosslinking reaction is promoted to form an ebonite by promoting a crosslinking reaction so as to prevent oxidative deterioration of the rubber, thereby forming a strong bond. The greater the surface hardness, the better the wear resistance.

Crack resistance: Shrinkage strain due to heating can be absorbed by adjusting a preferable distribution state (void ratio, void state) from the blending amounts of the inorganic fiber and the filler. Even if the disk material is made by the above-described papermaking method or by the calendering method like asbestos joint sheet, more fibers are mixed in one direction (longitudinal direction of asbestos board or joint sheet). Therefore, when the fibers and rubber start to deteriorate due to the temperature, the shrinkage in the direction in which the fibers are not oriented appears rather than the average shrinkage in all directions of the disk punched out in an annular shape. This is because the fiber itself suppresses shrinkage in the direction with many fiber orientations,
In the direction where the fibers are aligned but the fibers are not oriented,
This is because the rubber is deteriorated and shrinks more.

However, when the discs are inserted into the shaft by shifting the fiber direction by 120 ° or 90 ° for each disc, the shrinkage between adjacent discs interferes with each other to reduce the heat shrinkage and to make the disc uniform over the entire circumference. Since the shrinkage is small, partial cracking does not occur. Also, after burning the disc material to increase the crosslink density of the rubber to form a strong bond, blow off excess low temperature decomposition products such as rubber chemicals and fiber treatment agents to deaerate, and then insert into the shaft The heat shrinkage of the disk material at the time of high temperature use is eliminated, and it is effective in improving the crack resistance. In the shaft insertion method in the prior art, the roundness of the roll deteriorates due to heating, and the contact with the strip is strongly rubbed by the roll rotation,
Wears while being rubbed weakly. Therefore, the amount of wear increases. Moreover, a proper and uniform friction coefficient cannot be obtained.

Practical test: As a practical test, Example 1
The disc roll of No. 1 was used for a bridle roll connected to a continuous annealing furnace for thin stainless steel sheets for about 1 month.
No cracking was observed, and it was confirmed that the amount of wear was about 1/2 that of the roll using conventional asbestos fibers. Of course, no asbestos dust, which is a health hazard, was detected in the air around the device. Further, since the roll used for the practical test did not have cracks, the surface could be re-polished by about 1 mm and used again.

In each of the above-mentioned examples, an example in which an organic fiber is used in combination with an inorganic fiber having a shot excluding asbestos fiber is shown, but the organic fiber may be omitted depending on the application of the disc roll. Alternatively, the mixed composition may be heat-compressed into a sheet and punched out into a disc, and the disc may be inserted into a shaft without firing, compression-fixed, and surface-ground.

[0037]

As described above, according to the present invention,
It is possible to obtain a disk roll having excellent heat resistance, abrasion resistance, and a moderately large coefficient of friction over conventional rolls without using asbestos fibers.

[Brief description of drawings]

FIG. 1 is a sectional view of a disk roll showing an embodiment of the present invention.

FIG. 2 is a side view of a friction tester.

[Explanation of symbols]

 1 Disc 2 Shaft 2'Cooling Water Hole 3 Retainer Ring 4 Lock Nut 5 Steel Strip 6 Weight 7 Belt 8 Motor 9 Thermocouple A Disc Roll

Claims (2)

[Claims] 1. An inorganic fiber having no shot except asbestos fiber or 20 to 80% by weight of the inorganic fiber and the organic fiber,
A disc roll, wherein a disc material is obtained by punching out a sheet obtained by heating and compressing a mixed composition obtained by adding a rubber chemical and a filler to 10 to 30% by weight of rubber. 2. Inorganic fibers having no shot except asbestos fibers or 20 to 80% by weight of these inorganic fibers and organic fibers,
A mixture composition obtained by adding a rubber chemical and a filler to 10 to 30% by weight of rubber is heated and compressed into a sheet, punched into a disc, and fired at about 200 ° C., and many of the fired discs are fitted to a shaft. A method for manufacturing a disk roll, which comprises inserting, compressing and fixing, and grinding the surface.