JPS62107810A - Heat resistant roll - Google Patents

Abstract

PURPOSE:To prevent damage to goods being carried and to use a roll for a long period of time by using a heat resistant inorganic sheet material having a specific hardness for the roll and also using a heat resistant inorganic adhesive. CONSTITUTION:A wet type sheet manupacturing method sheet mainly consisting of inorganic materials having >=5 Moh's hardness is punched out a ringlike circular plate, for example. The sheets are stacked on the top of each other by the necessary number of the sheets, are inserted on a shaft bar, and are compressed from both side ends in a proper method to obtain a roll whose rolling surface is the peripheral edge of the ringlike circular sheets. Prior to compression, an inorganic adhesive whose dried-and-cured hardness is <=5 Moh's hardness is impregnated into the ringlike circular sheets. Then, the rolling surface is polished and finished properly in accordance with applications of the roll.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heat-resistant roll with low surface hardness, and more particularly to a heat-resistant roll that can be used in the rolling process and conveying process of steel, non-ferrous metals, etc.

(Prior technology) Conventionally, rolls used in the rolling process, conveyance process, etc. in the manufacture of steel, non-ferrous metals, etc. are made by laminating asbestos sheets, synthetic fiber nonwoven fabrics, etc., impregnating them with water glass, etc., and forming them by high-pressure press. Later, when necessary, the surface was polished and made into kohl.

(Problems to be Solved by the Invention) However, even those using the above-mentioned asbestos sheet have poor heat resistance; for example, when the temperature exceeds 400°C, they crack and fall apart, and the durability is only a few days at most. However, it was necessary to replace the rolls with new ones each time, which was unsatisfactory both economically and in terms of process. In addition, in order to improve the durability mentioned above, rolls using glass fiber for asbestos glue were considered, but the hardness of the roll surface caused scratches on the metal surface it came into contact with. Durability was also not sufficient.

(Means for Solving the Problems) As a result of intensive studies to eliminate the above-mentioned drawbacks, the inventors of the present invention have determined that an inorganic material with low hardness is used as the main material and impregnated with an inorganic adhesive. The inventors have discovered that the above-mentioned double-hole problems, that is, poor durability (heat resistance) and damage to the surface of objects that come into contact with the roll, can be solved all at once, and have arrived at the present invention.

That is, in the present invention, a wet paper-making sheet whose main component is an inorganic material with a Mohs hardness of 5 or less is punched into an appropriate shape, such as a donut-shaped disk, and an inorganic adhesive having a Keith hardness of 5 or less after solidification is applied to the sheet. Impregnated with agent and passed through the shaft rod,
It is a heat-resistant roll that is fixed by pressure from both sides, and it does not damage the metal surface even under high temperature conditions of 400 degrees Celsius or higher, and is several times to tens of times more durable than conventional products. .

The inorganic material used in the present invention has a Mohs hardness of 5 or less, and 4 if the target metal is aluminum.
or less, and has a heat resistance of 400'C or more, preferably 50'C or more.
Preferably fibrous or powder with a temperature of 0°C or higher, and a Mohs hardness of 5
Exceeding this will cause scratches on the contact surface of the metal moving on the roll. Inorganic materials suitable for this include many natural and man-made minerals. For example, potassium titanate, rock wool, anhydrite, nepheline, barite, calcite,
Cryolite, alloxite, fluorite, marenrite, graphite, rhodochrosite, mica group, anhydrite, wollastonite, rhodochrosite, siderite, talc, torite, vermiculite, red iron, Fibrous or whisker forms made of rosette, etc., with an aspect ratio of 5 or more are preferable, and even if the aspect ratio is less than 5, that is, powder, it can be used in combination with one with an aspect ratio of 5 or more. It can be used to do this.

When forming the above-mentioned inorganic substances into a sheet, if necessary, wood pulp, cellulose pulp such as cotton linter pulp, organic synthetic fibers such as nylon, polyester, and vinylon, aromatic polyamide fibers, novoloid fibers, carbon fibers, ) The sheet-forming properties can be further improved by using organic synthetic fibers such as phosphoric acid esterified pulp.

Furthermore, when forming sheets, it is possible to use, as necessary, paper strength enhancers, polymer flocculants, water-swellable bentonite, inorganic binders for papermaking such as mountain bark, and other papermaking chemicals as appropriate. can. At this time, it is preferable that the organic substance used in combination has a weight value of 30% or less, preferably 20% or less. If this organic substance exceeds 30% by weight, the heat resistance will be insufficient and the object of the present invention cannot be achieved.

The raw materials for papermaking, such as the above-mentioned inorganic substances, are soaked in water and formed into a sheet by a wet papermaking method. The wet papermaking method used in the present invention means that the above-mentioned water-dispersed liquid is uniformly dispersed onto a filter medium such as a strip-shaped, circular-shaped, or square-shaped filter net, filter cloth, or filter plate. This is a general term for a method in which a sheet is formed by pouring it into a thick layer or by sandwiching it with the above-mentioned filtration medium, performing natural filtration or vacuum filtration, and then drying it to form a sheet.

The sheet-like material obtained in this way is punched out by an appropriate method into a donut-like circular shape of a predetermined size with a center hole suitable for the cross-sectional shape of the shaft rod, and the required number of sheets are stacked and passed through the shaft rod. , Press from both sides by an appropriate method (- to obtain a roll in which the peripheral edge of the donut-shaped circular m-sheet is a bow-rule surface.

At this time, the donut-shaped circular sheet is impregnated with an inorganic binder before, during, or after compression.

The inorganic binder used here preferably has a Mohs hardness of 5 or less after drying and hardening, and examples thereof include, but are not limited to, silica-alumina water-based adhesives.

The surface of the NFCOOL thus obtained is polished to an appropriate finish depending on the intended use.

(Example) The present invention will be explained in more detail with reference to Examples below.
The present invention is not limited to these.

Example 1 70 tt parts of fibrous potassium titanate (product name: Tismo D1 manufactured by Otsuka Chemical Co., Ltd.) and rock wool (product name: Asano CM)
F 7000. (manufactured by Nippon Cement) in water, and further added 3 parts by weight of polyamide/polyamine/epichlorohydrin resin as a paper strength enhancer and 0.5 parts by weight of a polyacrylamide polymer flocculant to form an aqueous dispersion. This was prepared and made into paper using a Fourdrinier paper machine to obtain a sheet with a thickness of 0.5 square centimetres. 500 sheets were punched into doughnut-shaped circular shapes with an inner diameter of 30 cm and an outer diameter of 150 days, passed through an iron shaft with a diameter of 30 m, and loosely screwed from both sides through metal disks and flanges with an outer diameter of 140 m. Create a roll where the periphery of the sheet becomes the roll surface.

Next, the roll surface was immersed in an alumina-silica adhesive (product name: Nibond Nick 1081, 81m Kagaku), then strongly squeezed from both sides, and dried at 130°C for 1 hour with the screws firmly tightened. did. Next, the roll surface was polished to obtain a heat-resistant roll for testing. The Mohs hardness of the surface of the obtained heat-resistant roll is 4, and the surface temperature is 500~
When a rolled iron plate was subjected to a conveyance test at 600°C, the surface of the rolled plate was not damaged, and the plate showed good heat resistance), and the result was that it could be used continuously for 10 days.
It was still usable after several days.

As a comparative example, ultrafine glass fiber (average fiber 2 μm) was used as an inorganic substance.
A roll was prepared in exactly the same manner as in Example 1, except that 100 parts by weight was used and sodium silicate was used as the adhesive for the alumina-silica adhesive, and a conveyance test for rolled iron sheets was conducted. There are countless scratches on the surface of the rolled plate.1. Also, cracks appeared after 3 days of continuous use, making it unusable.

Examples 2 to 5 Using 200 doughnut-shaped disc sheets made using the composition shown in the composition column of Table 1 as an inorganic substance, Tomo et al.
A test roll was produced in exactly the same manner as in Example 1. Table 1 shows the results of measuring the surface Mohs hardness of this roll. This roll was also used to evaluate the opponent's aggressiveness using the following method, and the results are also shown in Table 1.

Mark: Method for evaluating opponent aggression A metal test piece with a smooth surface is heated to a specified temperature, and a test roll is rubbed on the smooth surface.Those with scratches on the surface are marked as If there was no item, mark it as ○.

(b) Durability evaluation method: The surface of the test roll is irradiated with infrared rays using an infrared lamp, and while being heated to a predetermined temperature, the same cross section is heated once a day.
The surface of the roll was pressed 10 times with a metal rod measuring 1.times.cm.times.1.alpha., and the appearance of cracks on the surface of the roll was observed.

Comparative Example 2 Using the composition shown in the composition column of Table 1 as an inorganic substance,
All examples except that water glass was used as the inorganic adhesive (Example 2)
A test roll was prepared in the same manner as above, and the performance was evaluated. The results are shown in Table 1.

Comparative Example & A test roll was prepared in the same manner as in Example 2, except that the composition shown in the composition column of Table 1 was used as the inorganic substance, and the results of performance evaluation are shown in Table 1.

As can be seen from the above results, sheets made mainly of inorganic substances with a Mohs hardness of 5 or less and impregnated with an inorganic heat-resistant adhesive with a Mohs hardness of 5 or less cause abrasions on the metal surfaces in contact. In addition, the durability was significantly improved compared to the conventional one.

(Functions and Effects) As mentioned above, the sheet material made of heat-resistant inorganic fibers with a Mohs hardness of 5 or less is used, and a heat-resistant inorganic adhesive (binder) is used in combination to form an FC roll body. Therefore, when used as a transport roll under high-temperature conditions such as processing metal materials, the roll does not damage the transported goods and can be used continuously for a long time without replacing.

Claims (1)

[Claims] (1) A wet paper-making sheet whose main component is an inorganic material with a Mohs hardness of 5 or less is punched into an appropriate shape like a donut-shaped disk, and this is impregnated with an inorganic adhesive having a Mohs hardness of 5 or less after solidification. A heat-resistant roll that is passed through a shaft and fixed by pressing from both sides.