JPS63111118A - Wear resistant roll having high heat resistance - Google Patents

Abstract

PURPOSE:To produce a roll having superior wear resistance and high heat resistance by impregnating an inorg. colloidal soln. into a disk roll composed of inorg. fibers, an inorg. filler and an inorg. binder and by drying the impregnated roll. CONSTITUTION:A doughnut-shaped circular body 2 is composed of inorg. fibers, an inorg. filler and an inorg. binder combined optionally with an org. binder. A prescribed number of such circular bodies 2 are laminated through a metal pipe 1 and both ends are fixed with metal washers 3 and nuts 4 to form a roll. Silica sol having about 20% solid content is brushed on the roll by about 75g per 1m<2> surface area of the roll and dried at about 100 deg.C to obtain a heat resistant roll for transferring a material to be heat treated in a heat treating furnace at a high temp. The heat resistant roll has superior surface smoothness as well as superior wear resistance and is useful as a roll for transferring glass.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a disc roll used for conveying a material to be heat treated in a high-temperature heat treatment furnace. The present invention relates to a highly wear-resistant heat-resistant roll that reduces wear on the main roll surface (hereinafter referred to as a heat-resistant roll) comprising a disc roll and further improves the smoothness of the heat-resistant roll.

[Prior art] In a heating furnace where heat treatment is performed continuously, steel slabs or
A large number of heat-resistant rolls are arranged perpendicular to the direction of movement of the disc roll for carrying in or out of steel plates, stainless steel plates, steel pipes, or glass.

The heat-resistant rolls are arranged in parallel inside the furnace or outside the furnace, and in particular, the heat-resistant rolls arranged in parallel in the furnace are required to have I@heat resistance, resistance to scratching, and smoothness.

Conventionally, this type of #thermal roll was made by cutting a sheet formed using a rubber binder, taking advantage of the properties of natural asbestos, into so-called donut-shaped annular bodies, and then compressing and laminating a plurality of these annular bodies. Then, by finishing the surface, it was formed into a #thermal roll and used.

However, asbestos used to form this heat-resistant roll has a typical composition of Sin.

Contains 37-42% by weight of MgO, 39-42% by weight of MgO, and 14% by weight of H and O, so approximately -f: 600°C
When used in the above manner, H20 molecules escape from the structure,
Significant deterioration of fiber strength occurs. Therefore, when a heat-resistant roll formed using such asbestos is used as a conveyor roll for a heat treatment furnace for steel plates, stainless steel plates, plate glass, etc. that are exposed to high temperatures, the roll surface will be significantly worn, and the life of the roll will be shortened. It had the disadvantage of being short.

On the other hand, according to Japanese Patent Publication No. 58-58415,
Asbestos Join 1 - A heat-resistant product made by inserting a large number of sheets into a sleeve shape by high-pressure press molding, tightening the sleeve from both ends and fixing it to a roll iron core, and then sintering at 350°C to 500°C. , discloses a roll with excellent wear resistance.

By the way, the present applicant previously filed Japanese Patent Application No. 59-25309 for aluminosilicate amorphous wAln,
A sheet of a so-called tonut-shaped annular body made of a raw material consisting of an inorganic filler, an organic binder, and a sintering aid (viscosity) so as to have a bulk specific gravity of 0.5 g/cm' or more is made of metal. We have filed an application regarding a highly heat-resistant roll that is fitted and fixed onto a manufactured shaft.

[Problems to be Solved by the Invention] The heat-resistant roll obtained by the prior art invention of Japanese Patent Publication No. 58-58415 has a high density.

It is an OT capability to reduce roll wear in order to increase the density of the cylindrical body, but since the sheet is pressed under high pressure and assembled onto an iron core, mm in the sheet is broken and roll stress is applied.
%, it had the disadvantage of cracking in the lateral direction and falling off.

On the other hand, in the roll obtained by the invention proposed in Japanese Patent Application No. 59-25309, alumina-silicate amorphous fibers and an inorganic filler are sintered and bonded using a sintering aid (viscosity), and f1# It has the drawback that the Pg jE of the roll progresses by the time the roll is sufficiently heated and sintered.

Furthermore, since the fiber diameter of the roll is thicker than that of asbestos, which is its main constituent, and the variation in fiber diameter is large, asbestos is inferior in the smoothness of the roll surface.
A fine uneven pattern is formed on the surface of the roll, and this pattern is transferred to the glass or the like that is withdrawn by the roll, so that it is not suitable as a roll for conveying glass.

In view of these circumstances, the present invention improves abrasion resistance without increasing the bulk specific gravity by assembling rolls like conventional asbestos rolls. So, what about roll g before roll sintering? ! The purpose is to reduce wear and further improve the surface smoothness of the roll.

[Means for Solving the Problems] In order to achieve this object, in the heat-resistant roll according to the present invention, the disc roll constituting the roll is impregnated with an inorganic colloid solution from the roll surface and dried. By doing so, the colloidal solution becomes a solid dry gel on the surface of the heat-resistant roll, reduces roll wear at low temperatures, and also fills dents in the roll, improving the surface smoothness of the roll.

On the other hand, during high-temperature heating, the surface of the dry gel solids fuses (
Sintering) generates mechanical strength, and the wear resistance of the roll is dramatically improved. Among these inorganic colloid solutions, silica sol has a particularly fine particle size of several tens of microns, has excellent permeability into the roll, and is extremely effective as a means for improving wear resistance. The impregnated amount of this colloidal solution is 7 g/m'' to 50 g/rn in terms of solid content per roll unit area.
' is the most advantageous. If the amount of impregnated impregnation is less than 7 g/rrf, the wear resistance of the roll will be insufficient, while if the amount of impregnated impregnation is more than 50 g/m', shrinkage due to sintering of the inorganic colloid will become significant and the joints between the layers will open. This is not desirable.

[Operation of the Invention] In the heat-resistant roll according to the present invention as described above, since the disk roll constituting the roll is impregnated with an inorganic colloid solution from the roll surface, the colloidal solution is used as the heat-resistant roll according to the present invention. It becomes a strong dry gel solid on the surface of the heat-resistant roll, reduces wear of the heat-resistant roll at low temperatures, and also fills indentations in the heat-resistant roll, improving the surface smoothness of the heat-resistant roll.

Next, the most typical embodiment of the present invention will be specifically described.

[Example] Example 1 Into a container with a capacity of 1rn' equipped with a stirrer, 81<g of 8001 water and 115m of amorphous aluminosilicate (trade name Ibiwool) with a shot content of 50% in the reprint version were charged. and pressed for 15 minutes to prepare a slurry solution.

On the other hand, the flow rate is 1701 from the side wall of a cylindrical container with a capacity of 25
/min, water pressure 1.5kg/crn', pressurized water supply,
The fiber slurry was introduced into the center of the vortex through a part of the cylindrical vessel VIA at a flow rate of 80 m/min, and after loosening the flocs, the slurry was allowed to flow through the center of the downstream 30 m/min.
It was collected on a mesh wire mesh.

Next, 290 g of the above-treated amorphous aluminosilicate fibers, 81 g of alumina fine powder, 70 g of wood knot viscosity,
43 g of magnesia fine powder and nitrile-butadiene latex 60rnJ1 (solid content 40%) were added to 25% water and sufficiently stirred and mixed to form a slurry. In this slurry, 7.5% polyacrylamide flocculant
Solution 118 m father and sulfur butyric acid 10% solution 400 rr
sJ1 was added, and the wet thickness was 18 m using a paper machine.
A sheet of m was made.

Next, the wet product was dehydrated and press-molded to a thickness of 6 mm, dried, and then punched into a disk having concentric circles to form a donut-shaped annular body (2).

A predetermined number of this annular body (2) is fitted into a metal vibrator (1) as shown in Fig. 1, and the ends are layered, and both ends are fixed with metal washers (3) and nuts (4). , the roll surface is ground smooth to obtain the height 4 of the present invention. @Roll. Then, the shisoka sol solution (solid content 20
%) per roll surface area at 75g/rrfm, 10
It was dried at a temperature of 0°C. Table 1 shows the physical properties of the roll thus obtained.

The hardness of the molding roll was measured in accordance with JIS K7215 using a hardness tester for hard rubber and plastics, after baking the roll at 1200°C for 12 hours.

Furthermore, the wear test was carried out using the testing machine shown in Fig. 2 after baking at 1200°C for 12 hours. ) was brought into contact with the molding roll while applying a constant load, and the wear mold of the forming roll measured the reduction rate.

Example 2 A commercially available asbestos plate was punched out into a tornut shape to obtain a disk (2), and a predetermined number of these disks (2) were fitted into a metal pipe (1) in the same manner as in Example 1 to form a grain layer. After fixing both ends with metal washers (3) and nuts (4), the roll surface was ground smooth to obtain an asbestos roll.

Next, on the roll thus formed, an alumina sol solution (solid content 10%) was spray applied at 200 g/m'' per roll surface area, and after drying at a temperature of 100°C, various physical properties of the roll were measured. The physical properties shown in the table were obtained.

Example 3 200 g of aluminosilicate amorphous fibers and 790 g of alumina crystalline fibers treated in the same manner as in Example 1
, 81g of alumina fine powder, 70g of terminal viscosity, 43g of magnesia fine powder and nitrile butadiene latex [iom
jL (solid content 40%) was added to 25 grams of water, sufficiently stirred and mixed to form a slurry, and in this slurry was a 7.5% polyacrylamide flocculant solution (118ml)! ;
400+ml of sulfuric acid hand IO% solution was added, and a sheet with a wet thickness of 18 mm was made using a paper machine. Next, dehydration press molding was performed in the wet state to a thickness of 6 mm, and after drying, a donut-shaped disk was punched out to form a disk (2) having concentric circles. By the same method as in Example 1, a predetermined number of discs (2) were fitted and stacked on a metal pipe (1), and both ends were fixed with metal washers (3) and nuts (4). After assembling, perform surface grinding.
It was made into a high heat resistant roll.

Next, the silica sol solution (solid content 20
%) and alumina sol solution (solid content IO%) at a ratio of 1:3, 100 g/gold was applied to the roll surface, and the physical properties of the roll were measured after drying at a temperature of 100 ° C. , 5 physical properties as shown in Table 1 were obtained.

Comparative Example 1 A silica sol solution (solid content 20
%) per surface area with a spray of 300 g/m'.
As a result of measuring various physical properties of the roll dry-exploded at a temperature of 00°C, the physical properties shown in Table 1 were obtained.

Comparative Example 2 Alumina sol solution (solid content 10%) was applied to the high heat resistant roll of Example 3 at 50 g/rn'Jjl per surface area, 10
As a result of measuring various physical properties of the roll that had been dry-exploded at a temperature of about 10.degree. C., the physical properties shown in Table 1 were obtained.

Comparative Example 3 Table 1 shows the results of measuring various physical properties of a conventional asbestos roll in the same manner.

Below is a blank [Effect of the invention] As is clear from L, the wear-resistant and highly heat-resistant roll of the present invention is a heat-resistant roll for conveying a material to be heat-treated in a high-temperature heat treatment furnace, and is made of inorganic m In the disc roll, which is compressed and fitted in large numbers to a molded plate or metal shaft formed of fiber, emergency filler, fi machine binder and, if necessary, an organic binder, an inorganic colloid solution is added to the disc roll. It is characterized by the fact that it is impregnated and dried, and as a result, it has the following superior properties compared to conventional asbestos rolls and high heat-resistant rolls made of high heat-resistant fibers that are not impregnated with an inorganic colloid solution.

(1) The amount of wear on the roll due to the heat-treated material was reduced, and the durability of the roll was significantly improved.

(2) The surface smoothness of a highly heat-resistant roll made of aluminosilicate amorphous material has been improved, making it possible to use it as a roll for conveying glass.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of a disc roll using the wear-resistant and highly heat-resistant roll of the present invention. FIG. 2 is a perspective view of an abrasion tester used to measure the wear reduction rate of the rolls. Explanation of symbols■...Vibe, 2...Tonut-shaped disk (annular body), 3...Washer, 4...Nut, 5...Forming roll, 6...Abrasion disc (sand vapor),
7...Support stand, 8...Jig for attaching weight.

Claims (4)

[Claims] (1) A heat-resistant roll for conveying a material to be heat treated in a high-temperature heat treatment furnace, which includes inorganic fibers, inorganic fillers,
In a disc roll in which a large number of molded plates made of an inorganic binder and, if necessary, an organic binder are compressed and fitted onto a metal shaft, the disc roll is impregnated with an inorganic colloid solution and dried. A wear-resistant and highly heat-resistant roll. (2) The inorganic fibers are one or more of asbestos, aluminosilicate, or siliceous amorphous fibers, or alumina, mullite, or zirconia crystalline fibers. A wear-resistant and highly heat-resistant roll according to claim 1, characterized by: (3) The wear-resistant and highly heat-resistant roll according to claim 1, wherein the inorganic colloid solution is one or more of silica sol, alumina sol, and zirconia sol. (4) The amount of impregnation and impregnation of the inorganic colloid solution is such that the solid content equivalent amount per unit area of the disc roll is 7 to 50.
g/m^2
Abrasion-resistant and highly heat-resistant roll described in Section 1.