JPH0635009B2 - Heat resistant roll - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat-resistant roll having a small surface hardness, and more particularly to a heat-resistant roll that can be used in a rolling process or a conveying process of steel, non-ferrous metal or the like.

(Prior Art) Conventionally, the rolls used in the rolling process, the conveying process, etc. in the production of steel, non-ferrous metal, etc. are laminated with an aspest sheet, synthetic fiber non-woven fabric, etc. Later, if necessary, the surface-polished finish was used to make a roll.

(Problems to be solved by the invention) However, even the one using the above-mentioned asbestos sheet is inferior in heat resistance, for example, at a temperature of 400 ° C. or higher, cracks occur and it becomes tattered, and the durability is about several days at most. It was necessary to replace with a new roll each time, which was economical and process unsatisfactory. In addition, in order to improve the above-mentioned drawback, that is, durability, a roll using a glass fiber instead of the aspest was examined,
Due to the high hardness of the roll surface, the contacting metal surface was scratched and the durability was insufficient.

(Means for Solving Problems) The inventors of the present invention have conducted diligent studies to solve the above-mentioned drawbacks, and as a result, use an inorganic material having low hardness as a main material and impregnate an inorganic adhesive. Thus, the inventors have found that both of the above-mentioned defects, that is, defects such as poor durability (heat resistance) and scratches on the surface of an object that comes into contact with the roll can be solved at once, and arrived at the present invention.

That is, according to the present invention, a wet papermaking sheet whose main component is an inorganic substance having a Mohs hardness of 5 or less is punched into an appropriate shape such as a donut-shaped disc, and an inorganic adhesive having a Mohs hardness of 5 or less after solidification is punched. Impregnate with the agent and pass it through the shaft,
It is a heat-resistant roll characterized by being clamped and fixed from both sides. It does not damage the metal surface even under high temperature conditions of 400 ° C or higher, and has durability that is several to several tens of times that of conventional products.

The inorganic substance used in the present invention has a Mohs hardness of 5 or less, and is 4 when the target metal is aluminum.
A fibrous or powder having a heat resistance of 400 ° C. or higher, preferably 500 ° C. or higher is preferable, and a Mohs hardness of more than 5 causes scratches on the contact surface of the metal moving on the roll. Suitable inorganic materials for this include many natural and artificial minerals. For example, potassium titanate, rockwool, anhydrite, nepheline, heavy shale, calcite, eternal stone,
Perovskite, fluorite, galena, ore, graphite, rhodochrystalite, mica group, hard manganese ore, quartzite, rhodomanganese, rhombite, talc, tollite, vermiculite, hematite, rose pyroxene It is preferably a fibrous or whisker made of etc. and has an aspect ratio of 5 or more, and even if it has an aspect ratio of less than 5, that is, even if it is in the form of powder, it can be used in combination with an aspect ratio of 5 or more. Can be used.

When forming the above-mentioned inorganic substance into a sheet, if necessary, wood pulp, cellulose pulps such as Kotton linter pulp, nylon, polyester, organic synthetic fibers such as piniron, aromatic polyamide fibers, novoloid fibers, carbon fibers, The sheet formability can be further improved by using organic flame resistant fibers such as phosphate esterified pulp in combination.

Further, when forming into a sheet, a paper strength enhancer, a polymer flocculant, a hydrated and swelling bentonite, an inorganic binder for papermaking such as mountain bark, and other papermaking agents, etc., which are usually used, can be appropriately used in combination, if necessary. . At this time, the organic substance used is preferably 30% by weight or less of the sheet, and preferably 20% by weight or less. If this organic substance exceeds 30% by weight, the heat resistance becomes insufficient and the object of the present invention cannot be achieved.

The above-mentioned raw materials for papermaking such as inorganic substances are dispersed in water and formed into a sheet by a wet papermaking method. The wet papermaking method used in the present invention means, for example, a belt-shaped, circular, or square-shaped over-mesh, an over-medium such as a cloth or plate, and a uniform thickness of the liquid dispersed in the water. It is a general term for a method of forming into a sheet form by allowing it to flow, or by sandwiching it with the above-mentioned excess medium, and then drying it by an operation such as natural or reduced pressure.

The sheet-like material thus obtained is punched by a suitable method into, for example, a donut-shaped circle having a center hole suitable for the sectional shape of the shaft rod, and a necessary number of sheets are stacked and passed through the shaft rod. The doughnut-shaped sheet is compressed by an appropriate method to obtain a roll whose peripheral portion is the surface of the roll.

At this time, the doughnut-shaped circular sheet is impregnated with the inorganic binder before, during or after compression.
The inorganic binder used here preferably has a Mohs hardness of 5 or less after drying and curing, and examples thereof include silica-aluminum-based water-based adhesives, but are not limited thereto.

The surface of the roll thus obtained is appropriately polished and finished depending on the application.

(Examples) Hereinafter, the present invention will be described in more detail with reference to Examples.
The present invention is not limited to these.

Example 1. Fibrous potassium titanate (trade name: Teismo D, made by Otsuka
70 parts by weight and rock wool (Product name: Asano CMF)
7,000, made by Nippon Cement) 30 parts by weight dispersed in water, and
Polyamide, polyamine, and epichloro as paper strength agents
3 parts by weight of hydrin resin and polyacrylamide polymer
Add 0.5 parts by weight of a collecting agent to prepare an aqueous dispersion, and
Paper was made with a net paper machine to obtain a sheet having a thickness of 0.5 mm. The
Seat 500 in a donut-shaped circular shape with an inner diameter of 30 mm and an outer diameter of 150 mm
Stamping, passing through a 30 mm diameter iron shaft, 140 mm outer diameter from both sides
Loosely tighten the metal disc and flange through the
A roll having a roll surface at the peripheral portion of the sheet was produced. Next
Then, apply the alumina / silica adhesive (commercial
Name: Bond Etx 81, manufactured by Nissan Kagaku)
Squeeze strongly from both sides of the rear and tighten with the screw tightened.
It was dried at 0 ° C for 1 hour. Then, the roll surface is polished and
The heat-resistant roll was used for testing. Surface of the obtained heat resistant roll
Has a Mohs hardness of 4 and an iron surface temperature of 500-600 ° C.
When subjected to the conveyance test of the rolled sheet, the surface of the rolled sheet was damaged.
Without heat, it also has heat resistance and can be used even after 10 days of continuous use.
It was possible.

Comparative Example 1. Ultrafine glass fiber (average fiber 2 μm) 10 as an inorganic substance
A roll was prepared in exactly the same manner as in Example 1 except that 0 part by weight was used and soda-based soda was used instead of the alumina-silica adhesive. Countless scratches were formed on the surface of the rolled sheet, and cracks formed after 3 days of continuous use, making it unusable.

Examples 2 to 5 Test rolls were prepared in exactly the same manner as in Example 1 except that 200 donut-shaped disc sheets prepared by using the composition shown in the composition column of Table 1 as the inorganic substance were used. . The results of measuring the surface molding hardness of this roll are shown in Table 1. Also, using this roll, the opponent attack was evaluated by the following method, and the results are also shown in Table 1.

(A) Method of evaluating opponent attacking property A metal test piece having a smooth surface is heated to a predetermined temperature, and a test roll is rubbed on the smooth surface, and the surface is scratched. Is ○.

(B) Durability evaluation method The surface of the test roll is irradiated with infrared rays from an infrared lamp and heated to a predetermined temperature, and the cross section is 1 cm once a day.
The roll surface was pushed 10 times with a force of 2 kg with the tip of a metal rod of × 1 cm, and the generation state of cracks on the roll surface was observed.

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

Comparative Example 3. 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 performance evaluation results are shown in Table 1.

As can be seen from the above results, a sheet containing an inorganic substance having a Mohs hardness of 5 or less as a main component and impregnated with an inorganic heat-resistant adhesive having a Mohs hardness of 5 or less causes scratches on the contacting metal surface. It was a non-tightening material and the durability was remarkably improved as compared with the conventional one.

(Operation and effect) Since it is a roll body using a sheet material made of an inorganic fiber or the like having heat resistance and Mohs hardness of 5 or less as described above, and further using an inorganic adhesive (binder) having heat resistance When used as a roll for conveyance under high temperature conditions such as processing of metal materials, it can be continuously used without damaging the conveyed article and replacing it for a long time.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Suzue 463 Kagasuno, Kawauchi Town, Tokushima City, Tokushima Prefecture, Tokushima Plant, Otsuka Chemical Co., Ltd. 72) Inventor Shinichiro Katsuta 23, 353, Ishizaka, Fuji City, Shizuoka Prefecture 23 (72) Inventor Yoshitaka Maeda 4-1 Shimbashi Town, Fuji City, Shizuoka Prefecture (56) Reference JP-A-54-33940 (JP, A)

Claims (1)

[Claims] 1. A wet papermaking method sheet having a main component composed of an inorganic substance having a Mohs hardness of 5 or less is punched into a suitable shape such as a donut-shaped disc, and an inorganic adhesive having a Mohs hardness of 5 or less after solidification is punched. A heat-resistant roll characterized by being impregnated, passed through a shaft and pressed and fixed from both sides.