JP4318555B2 - DISK ROLL, MANUFACTURING METHOD THEREOF, AND DISK ROLL BASE - Google Patents

Description

  The present invention relates to a disk roll in which a plurality of ring-shaped disk materials are fitted on a rotating shaft and a conveying surface is formed by the outer peripheral surface of the disk material, a manufacturing method thereof, and a disk roll for obtaining the disk roll The present invention relates to a substrate for use.

  For example, a disk roll is used to transport a plate glass flowing down from a melting furnace or a metal plate such as a stainless steel plate heated in an annealing furnace. FIG. 1 is a schematic view showing an example of a disk roll 10, and an aqueous slurry in which inorganic fibers such as ceramic fibers, inorganic fillers such as talc, clay and mica, and a binder are blended is about 3 to 6 mm in thickness. A disk roll base material formed into a plate shape is punched into a ring-shaped disk, and a plurality of the disk materials 12 are inserted into a metal shaft 11 serving as a rotating shaft to form a roll-shaped laminate, which is arranged at both ends. The whole is pressed through the flange 13 and is fixed with a nut 15 or the like in a state where the disk material 12 is slightly compressed, and the outer peripheral surface of the disk material 12 functions as a conveying surface.

  The above-described disk roll 10 is incorporated in, for example, the plate glass manufacturing apparatus 100 shown in FIG. 2 and is used for conveying the plate glass. The plate glass manufacturing apparatus 100 continuously discharges the glass melt 110 from the slits 102 that are linearly opened in the melting furnace 101, causes the discharged belt-shaped glass melt 110 to flow down, and cools it during the flow. Although it is an apparatus which manufactures plate glass by making it harden | cure, the disk roll 10 functions as a pair of tension | pulling roll, clamps the strip | belt-shaped glass melt 110, and is forcibly sent out below.

  Thus, since the disk roll 10 is exposed to a high temperature (around 800 ° C.) close to the melting temperature of the glass, the individual disk materials 12 are easily deformed and dimensional changes are likely to occur. Further, the component material of the disk material 12 deteriorates due to such high temperature and may cause “powder falling” that separates into powder, and the detached powder adheres to the plate glass located downstream of the disk roll 10. This reduces the yield.

  In order to avoid such a problem, the disk roll 10 is strongly required to have excellent heat resistance and a low thermal deformation rate, and the applicant of the present invention has previously been composed mainly of wollastonite and ceramic fiber. The disk roll produced from the base material for disk rolls to which it is made is proposed (refer patent document 1).

JP-A-9-301765

  The above-mentioned disk roll by the present applicant is less likely to be thermally deformed and deteriorated even at a high temperature of 1200 ° C., and can be suitably used for producing plate glass. However, the surface temperature of the stainless steel plate treated in the annealing furnace is close to 1300 ° C., and even if a disk roll by the present applicant is used, the replacement is relatively early, and further improvement in heat resistance can be achieved. It is desired.

  The present invention has been made in view of such a situation, and for example, a disk roll having excellent heat resistance that can sufficiently cope with conveyance of a metal plate such as a stainless plate processed in an annealing furnace, and the disk. It aims at providing the base material for disk rolls for obtaining a roll. Another object of the present invention is to provide a method for efficiently producing the above-described disk roll without causing an increase in cost by using the above-described disk roll substrate.

  As a result of diligent research to achieve the above object, the present inventors have found that a disk roll containing crystalline cordierite has much less dimensional change and structural deterioration than a conventional product even at a high temperature of 1300 ° C., It has been found that it can be used satisfactorily when a metal plate such as a stainless steel plate is conveyed in an annealing furnace. Furthermore, a normal disk roll is manufactured using a disk material punched from a disk roll base material containing amorphous cordierite, and a high-temperature plate glass or a stainless steel plate is transferred according to a normal use form. Along with this, it has been found that amorphous cordierite is crystallized into crystalline cordierite. The present invention is based on these findings.

That is, in order to achieve the above object, the present invention provides a disk roll, a method for producing the disk roll, and a disk roll substrate as described below.
(1) In a disk roll formed by inserting a plurality of ring-shaped disk materials on a rotating shaft and forming a conveying surface by the outer peripheral surface of the disk material,
And inorganic fibrous said disc member, the amorphous cordierite and synthetic cordierite, amorphous cordierite Synthesis cordierite = 12: 1 to 3: by containing cordierite mixture was mixed at 10 Disc roll featured.
(2) The content of inorganic fibers is 5 to 50% by mass of the total amount of the disk material, and the content of the cordierite mixture is 20 to 80% by mass of the total amount of the disk material, Disk roll.
(3) The disk roll according to (1) or (2) above, wherein a crystallized product of amorphous cordierite is present at least on the surface layer portion of the transport surface .
(4) In a manufacturing method of a disk roll in which a plurality of ring-shaped disk materials are inserted into a rotating shaft, and a conveying surface is formed by the outer peripheral surface of the disk material,
A step of obtaining a disk roll substrate by forming a slurry raw material containing inorganic fibers and amorphous cordierite into a plate shape, a step of punching a disk material from the disk roll substrate, and a plurality of the disk materials And a step of fixing the disc material by being inserted into a rotating shaft, and a step of crystallizing at least the amorphous cordierite of the outer peripheral surface layer portion of the disc material by conveying an object to be conveyed in a high temperature state. method of manufacturing features and to Lud scroll that.
(5) above (4) Symbol mounting disc manufacturing method of the roll, characterized in that the slurry raw material further comprises a synthetic cordierite.
(6) The process for producing a disk roll according to the above (4) or (5), wherein the step of obtaining a disk roll substrate is carried out by a papermaking method in which organic fibers and an organic binder are blended in the slurry raw material .
(7) A plate-like molded body for obtaining a disk material, comprising inorganic fibers, amorphous cordierite and synthetic cordierite, amorphous cordierite: synthetic cordierite = 12: 1 to 3:10 disk rolls Yomotozai characterized by containing a cordierite mixture was mixed in.
(8) the content of the inorganic fibers is 5 to 50 mass% of the substrate whole amount, (7) the content of cordierite mixture, characterized in that 20 to 80% by weight of the substrate whole amount according Disc roll base material .

  According to the present invention, a disk roll having much higher heat resistance than the conventional one can be obtained, and can be sufficiently used for conveying a stainless steel plate heated to about 1300 ° C. in an annealing furnace, for example.

  Hereinafter, embodiments of the present invention will be described in detail.

First, the base material for disk roll of the present invention will be described. The main components thereof are a cordierite mixture of amorphous cordierite and synthetic cordierite and inorganic fibers. Amorphous cordierite has 2MgO · 2Al ₂ O ₃ · 5SiO whose composition is the same as that of crystalline cordierite and becomes crystalline cordierite by crystallization, so to speak, a precursor of crystalline cordierite It is. This amorphous cordierite is prepared by mixing raw materials such as metal oxides, ceramics, and minerals so as to have the above-mentioned cordierite composition ratio, and then firing (melting) and quenching at a predetermined temperature. It is a powder obtained by pulverizing with a pulverizer such as an alumina ball mill afterwards, and is also available from the market, for example, “14-3635P” manufactured by Nippon Fellow.

  As the inorganic fibers, various inorganic fibers conventionally used in disc rolls can be used as appropriate, and examples thereof include ceramic fibers, mullite fibers, alumina fibers, silica fibers, silica / alumina fibers, and the like. Among these, alumina fibers, mullite fibers, silica / alumina fibers, and silica fibers excellent in heat resistance are preferable. Moreover, inorganic fiber can use 2 or more types together as needed.

As shown in FIG. 3, the disk base material containing amorphous cordierite undergoes initial thermal expansion by heating, shrinks and crystallizes when reaching the softening start temperature, and again undergoes thermal expansion when crystallization is completed. It becomes like this. Further, shrinkage during softening / crystallization (softening maximum shrinkage) greatly affects the dimensional change and thermal stress of the disk material. In order to keep this softening maximum shrinkage small, it is effective to contain synthetic cordierite that has already been crystallized. Synthetic cordierite acts as an aid for crystallization of amorphous cordierite, and by quickly increasing the crystallization speed, the unstable crystallization process is quickly terminated, minimizing problems such as softening that occur during crystallization. Has the effect of stopping. In addition, since amorphous cordierite is not a complete cordierite composition, when used alone, the crystallized product may contain impurities and the crystal structure may be distorted, but synthetic cordierite functions as a seed crystal, It is possible to reduce the distortion of the crystal structure to more effectively develop the heat resistance and low thermal expansion properties, which are the original characteristics of cordierite, and to improve the performance more stably. This synthetic cordierite is equivalent to one obtained by crystallizing amorphous cordierite and does not impair the effects of the present invention.

Synthetic cordierite is prepared by mixing a mixture of magnesium oxide source: aluminum oxide source: silicon oxide source = 2: 2: 5 in accordance with the cordierite composition (2MgO · 2Al ₂ O ₃ · 5SiO) at a crystallization temperature. It is a crystalline cordierite obtained by heating to 1350 ° C. or higher. Examples of the mixture include a mixture of 28 parts by mass of talc, 47 parts by mass of kaolin clay and 35 parts by mass of aluminum oxide, and pulverized to an average particle size of about 0.5 μm using a ball mill. it can. In this mixture, talc is “SD55” manufactured by Fuji Talc Kogyo Co., Ltd., kaolin clay is “Gromax LL” manufactured by Tsuchiya Kaolin Kogyo Co., Ltd., and aluminum oxide is “alumina powder A” manufactured by Showa Aluminum Co., Ltd. -42-2 "is also available from the market. Furthermore, synthetic cordierite is also available from the market as “synthetic cordierite SS species” manufactured by Marusu Shaku Goshi Kaisha, for example.

  In addition to the disk roll substrate of the present invention, various materials conventionally used for disk rolls can be blended as necessary. For example, the base material for disk roll of the present invention is made of an aqueous slurry containing amorphous cordierite and inorganic fibers, and optionally synthetic cordierite, and molding or papermaking such as suction dehydration molding using a molding die. However, in terms of cost, the papermaking method is advantageous. In order to improve papermaking properties, shape retention and the like in the papermaking method, it is preferable to add a coagulant aid, an organic fiber, an organic binder, and the like. Any of these may be conventionally used when producing a substrate for a disk roll by a papermaking method, montmorillonite powder or the like can be used as an agglomeration aid, pulp or the like can be used as an organic fiber, and an organic binder An aqueous starch solution or the like can be used. In molding, no coagulant aid or organic fiber is required.

In the composition of the base material for disk roll, it is preferable that the content of the cordierite mixture is 20 to 80% by mass of the total amount of the base material. If the content of the cordierite mixture is less than 20% by mass, it is difficult to obtain the desired heat resistance, and if it exceeds 80% by mass, the blending ratio of inorganic fibers is relatively low, and the strength may be excessively reduced. Arise. Moreover, 5-50 mass% of content of an inorganic fiber is preferable with respect to the whole base material. If the content of the inorganic fiber is less than 5% by mass, the strength is insufficient, and if it exceeds 50% by mass , the content of the cordierite mixture is relatively decreased and the effect of improving the heat resistance is not exhibited.

Synthetic cordierite replaces part of amorphous cordierite, and the mixing ratio of amorphous cordierite and synthetic cordierite at that time is amorphous cordierite: synthetic cordierite = 12 : 1 to 3:10, more preferably 11: 2 to 3:10 , and particularly preferably 9: 4 to 5: 8. When the ratio of the synthetic cordierite is less than the above value, the function as an auxiliary agent at the time of crystallization as described above does not work sufficiently, and the whole base material may not be crystallized. On the other hand, when the ratio of the synthetic cordierite is larger than the above value, there is a concern that the amount of amorphous cordierite is too small to obtain the binder effect and the desired strength cannot be obtained. Moreover, said softening maximum shrinkage rate can be suppressed, so that the ratio of synthetic cordierite is large.

  In addition, the blending ratio of the above-mentioned other materials can be appropriately set as necessary as long as the desired effect of the present invention is not impaired. However, the aggregation auxiliary agent is 3% by mass or less, and the organic fiber is 10% by mass. The organic binder is suitably 5% by mass or less.

  As a method for obtaining a base material for a disc roll, it is efficient and preferable to use a papermaking method. That is, an aqueous slurry containing a predetermined amount of amorphous cordierite and inorganic fibers, and further, if necessary, synthetic cordierite, agglomeration aid, organic fiber, organic binder, etc. is prepared, and this aqueous slurry is formed into a plate shape with a papermaking machine. The base material for disk rolls can be obtained by forming into a shape and drying. In addition, the thickness of the base material for disk rolls can be set as appropriate, and may be the same as the conventional one, and is generally 2 to 10 mm.

  Next, the manufacturing method of the disk roll of this invention is demonstrated. The manufacturing method basically follows the conventional method, and will be described with reference to FIG. 1 again. First, a ring-shaped disk material 12 is punched from the disk roll base material of the present invention described above, and a plurality of the disk materials 12 are inserted into a metal (for example, iron) rotating shaft 11 to form a roll-shaped laminate. Then, the whole is pressed from both ends via the flanges 13 arranged at both ends, and is fixed with a nut 15 or the like in a state where a slight compression is applied to the disk material 12. And the outer peripheral surface of the disk material 12 is ground so that it may become a predetermined | prescribed roll diameter. In addition, the grinding surface is smoothed by this grinding.

The disk roll of the present invention is configured as described above, and further, the surface of the above-described disk roll can be heated to crystallize at least the amorphous cordierite in the surface layer portion of the outer peripheral surface of the disk material 12. preferable. Crystalline cordierite, which is a crystallized product, has a thermal expansion coefficient of 0.7 to 1.5 × 10 ⁻⁶ / ° C., which is small compared to conventional disk roll materials, and has high thermal shock resistance, that is, spalling resistance. It has the advantage of being excellent. In addition, the chemical stability is high and the reactivity with high-temperature glass or stainless steel plate is low. As described above, disk rolls are required to have low deformation and dimensional change at high temperatures and less thermal degradation that induces powder falling, but crystalline cordierite is more resistant to scratches than conventional disk rolls. Since it is excellent in poling property, it can be used sufficiently even at a high temperature of 1300 ° C. like the conveyance of a stainless steel plate. In addition, iron oxide is likely to be generated on the surface of a high-temperature stainless steel plate, but crystalline cordierite has low reactivity, so there is little damage to the roll surface by this iron oxide, and the life is long.

  Here, amorphous cordierite crystallizes into crystalline cordierite when heated to about 800 ° C. to 1300 ° C. On the other hand, since the glass ribbon melt 110 is processed in a high temperature atmosphere of around 900 ° C. and the stainless steel plate is also around 1300 ° C., the above crystallization is performed using the disk roll produced as described above. According to the form, it can be carried out by carrying the belt-shaped molten glass 110, the stainless steel plate or the like. Therefore, a new manufacturing process or manufacturing apparatus for crystallization is unnecessary, and the cost for manufacturing is not increased. Further, there is an advantage that the crystallization of amorphous cordierite gradually progresses to the inside (inner diameter side) of the disk material 12 with use, resulting in a stronger disk roll.

  Examples The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited thereby.

(Examples 1 to 17, Comparative Example 1)
An aqueous slurry in which the raw materials shown in Table 1 were blended was prepared, and a base material for a disk roll having dimensions of 100 mm × 100 mm × 6 mm after drying was prepared by a normal papermaking method. In addition, the mixing | blending of the comparative example 1 follows patent document 1 by this applicant. Each disk roll substrate was subjected to the following measurements and tests.

(Measurement of heat change rate)
Each disk roll substrate was held in a heating furnace maintained at 900 ° C. or 1300 ° C. for 180 minutes, and the dimensional change rate (heat change rate) before and after heating was measured. The results are shown in Table 1.

(Abrasion resistance test)
Each disk roll substrate was heated under the same conditions as those for measuring the rate of thermal change, allowed to cool to room temperature, and then rubbed by hand. The surface abrasion resistance was evaluated based on the tactile sensation at that time. The evaluation criteria are: x = powdered by friction, o = powder transferred to hand by friction, ◎ = no transfer or powdering observed, results shown in Table 1.

(Hot wear test)
A ring-shaped disk having an outer diameter of 80 mm and an inner diameter of 30 mm was punched out from each disk roll base material, and was inserted into an iron rotating shaft having a diameter of 30 mm and a length of 100 mm to produce a cylindrical disk roll as shown in FIG. Further, a ring-shaped disk was punched out in the same manner from the disk roll substrate of the composition of Comparative Example 1 to produce a cylindrical disk roll. And this disc roll is arrange | positioned in an experimental furnace, the furnace temperature is maintained at 1050-1300 degreeC, it is made to rotate continuously for 5 hours in the state which pressed the stainless steel round bar of diameter 30mm, and from the outer diameter change before and behind a test. The amount of wear was determined. The results are shown in Table 1.

(Measurement of softening maximum shrinkage and softening start temperature)
The maximum softening shrinkage was measured using a thermomechanical property measuring apparatus ("TMA-50" manufactured by Shimadzu Corporation) having the configuration shown in FIG. This measuring device places a sample on the bottom of a housing and applies a certain sub-compressive load from the load generation unit to the sample via a probe while heating in a heating furnace, and the dimensional change of the sample at that time is detected by a position detection unit. The coefficient of thermal expansion and the rate of thermal deformation are obtained by detecting the above. The softening start temperature was also measured at the same time. The results are shown in Table 1.

  As shown in Table 1, the disk roll base materials of Examples 1 to 11 containing 30 to 80% by mass of amorphous cordierite have little dimensional change even at a high temperature of 1300 ° C., and are excellent in wear resistance. ing. Furthermore, the base materials for disk rolls of Examples 12 to 17 in which a part of amorphous cordierite is replaced with synthetic cordierite have improved softening maximum shrinkage. Also, the greater the proportion of synthetic cordierite, the smaller the maximum softening shrinkage. On the other hand, the disk roll base material of Comparative Example 1 has a dimensional change at 900 ° C. that is inferior to that of the disk roll base material of the example, but at 1300 ° C., the rate of heat change is greatly increased. This shows that the base material for disk rolls of the present invention is excellent in heat resistance.

It is the schematic which shows an example of the disk roll of this invention. It is the schematic which shows the usage example (plate glass manufacturing apparatus) of the disk roll shown in FIG. It is a figure for demonstrating expansion | swelling and shrinkage | contraction at the time of a heating of an amorphous cordierite containing disk material. It is a schematic diagram which shows the apparatus used in order to measure the softening maximum shrinkage rate in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disc roll 11 Metal rotating shaft 12 Disc material 13 Flange 15 Nut 100 Sheet glass manufacturing apparatus 101 Melting furnace 102 Slit 110 Strip glass melt

Claims (8)

In the disk roll formed by inserting a plurality of ring-shaped disk materials on the rotating shaft, and forming a conveying surface by the outer peripheral surface of the disk material,
And inorganic fibrous said disc member, the amorphous cordierite and synthetic cordierite, amorphous cordierite Synthesis cordierite = 12: 1 to 3: by containing cordierite mixture was mixed at 10 Disc roll featured. 2. The disk roll according to claim 1, wherein the content of the inorganic fiber is 5 to 50% by mass of the total amount of the disk material, and the content of the cordierite mixture is 20 to 80% by mass of the total amount of the disk material. 3. The disk roll according to claim 1, wherein a crystallized product of amorphous cordierite is present at least on the surface layer portion of the transport surface . In a method of manufacturing a disk roll in which a plurality of ring-shaped disk materials are inserted into a rotating shaft, and a conveying surface is formed by the outer peripheral surface of the disk material,
A step of obtaining a disk roll substrate by forming a slurry raw material containing inorganic fibers and amorphous cordierite into a plate shape, a step of punching a disk material from the disk roll substrate, and a plurality of the disk materials And a step of fixing the disc material by being inserted into a rotating shaft, and a step of crystallizing at least the amorphous cordierite of the outer peripheral surface layer portion of the disc material by conveying an object to be conveyed in a high temperature state. method of manufacturing features and to Lud scroll that. Manufacturing method for a disk roll according to claim 4 Symbol mounting, characterized in that the slurry raw material further contains a synthetic cordierite. The method for producing a disk roll according to claim 4 or 5, wherein the step of obtaining a disk roll substrate is carried out by a papermaking method in which organic fibers and an organic binder are blended in the slurry raw material . A plate-like molded body for obtaining a disk material, in which inorganic fibers, amorphous cordierite, and synthetic cordierite are mixed at amorphous cordierite: synthetic cordierite = 12: 1 to 3:10 A base material for a disc roll , comprising: a cordierite mixture prepared . The base for disk roll according to claim 7 , wherein the content of the inorganic fiber is 5 to 50% by mass of the total amount of the base material, and the content of the cordierite mixture is 20 to 80% by mass of the total amount of the base material. Wood .

Images