JP2912111B2 - Internal water-cooled roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal water-cooled roll used for producing a ribbon by a quenching process or continuous casting.

[0002]

2. Description of the Related Art An internal water-cooled roll is a type in which cooling water flows in one direction along the roll axis, as seen in continuous casting and the like, or is supplied to a central portion of a roll body length and distributed to both ends. Considering each channel, distribution ratio, etc.
It is devised to obtain an effect according to the purpose of use. That is, besides removing the heat supplied from the roll surface with water, maintaining the roll strength,
The purpose is to prevent roll deformation due to the heat crown. Since such rolls are subjected to high heat loads, the amount of expansion generally ranges from several hundreds of μm to mm.

On the other hand, a roll used for manufacturing a quenched ribbon has a relatively small thermal load and is not subjected to bending or impact force, so that the thermal expansion of the roll surface is several μm to several tens μm.
It is. For example, an amorphous alloy manufactured by a single roll method or the like has a low melting point, and the distance between the roll and the molten steel is within several mm. In order to minimize unevenness in the width direction of the quenched ribbon, the heat crown on the roll surface must be reduced.

As a roll for producing a quenched ribbon, Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. 9-9948 discloses a method in which an inverted crown is provided on a roll in advance, and the roll surface is flattened by contact with molten steel. However, such a method has a disadvantage that an inverse crown process is required for each production opportunity.

Further, Japanese Patent Application Laid-Open Nos. 56-68559 and 59-54445,
In each of JP-A-57-112954 and JP-A-58-135751, the number, size and shape of the cooling grooves are considered so that the cooling capacity at the center in the sleeve width direction is higher than that at the ends, and By changing the cooling capacity between the center and the end,
There has been proposed a method of eliminating the heat crown by making the temperature distribution uniform. In each of these methods, the amount of cooling water and the cooling area in the central portion are considered to be larger than those in the end portions, and the heat removal amount in the central portion is devised. However, if the thickness of the roll sleeve changes or the amount of heat supplied to the roll surface changes, these methods naturally change the heat balance between the end and the center, and cannot be applied to all conditions. .

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling structure for a roll, particularly a small thermal expansion and a small heat required for a quenched ribbon manufacturing roll, which can avoid the above-mentioned adverse effects due to the thermal deformation on the roll surface. The purpose is to propose a structure to achieve a crown.

[0007]

In order to increase the cooling efficiency with an internal water-cooled roll, it is necessary to facilitate the heat transfer from the roll surface, and various measures can be considered for that purpose. In order to make the temperature of the roll surface equal in the axial direction, the inventors have developed a structure for flowing the cooling water to the inner surface of the roll sleeve under the same conditions as a means for equalizing the heat transfer between the cooling water and the roll sleeve. Investigations have found that by making the pressure loss of the cooling water in the slit flowing through the inner surface of the roll uniform, the flow rate of the cooling water is constant, and inventing a roll having an extremely excellent uniform cooling ability described below. Reached.

That is, the present invention is an internal water-cooled roll comprising a roll shaft and a sleeve that covers the peripheral surface thereof and forms a cooling water flow path between the roll shaft and the roll shaft. On the inner peripheral surface, a number of cooling grooves extending continuously over the entire circumference of the roll are provided in parallel in the roll axis direction,
Two pieces extending in the axial direction along the peripheral surface of the roll shaft, communicating with a water supply port opened at one end of the roll shaft through a water supply passage extending in the radial direction of the roll shaft on the peripheral surface of the roll shaft. The water supply groove is formed at a position that is symmetrical with respect to the roll axis, and communicates with a drain port opened at the other end of the roll axis through a drainage path extending in the radial direction of the roll axis.
An internal water-cooled roll characterized in that two drain grooves extending in the axial direction are formed along the peripheral surface of the roll shaft at positions 90 ° apart from the water supply groove in the circumferential direction of the roll shaft. .

Here, in the practice, it is advantageous to make the circumferential lengths of the cooling grooves equal. Further, each of the water supply groove and the drain groove may have a double structure that overlaps in the radial direction of the roll.

[0010]

In order to impart uniform cooling ability to the roll, it is important to flow cooling water under uniform pressure into cooling grooves formed in the inner peripheral surface of the sleeve. In the roll according to the present invention, the water supply groove for supplying the cooling water to the cooling groove and the drainage groove for discharging the cooling water flowing through the cooling groove are first extended in the axial direction along the peripheral surface of the roll shaft. And a structure in which water supply and drainage in the roll axis direction can be uniformly performed. In addition, the water supply groove and the drainage groove extend in the circumferential direction of the roll shaft.
At a position separated by 90 °, that is, at a position where each of the water supply grooves and each of the drain grooves are symmetric with respect to the roll axis,
By making water supply and drainage appear alternately,
The cooling water is supplied and discharged uniformly in the circumferential direction of the roll shaft. Therefore, the pressure of the cooling water flowing in the cooling groove becomes uniform in both the axial direction and the circumferential direction of the roll shaft, and the roll cooling ability can be made uniform.

Therefore, the roll according to the present invention has a uniform heat removal from the surface thereof. Therefore, the use of this roll makes it possible to produce a quenched ribbon under the condition of an extremely small heat crown. The thickness deviation in the width direction of the quenched ribbon is greatly improved.

Further, cooling grooves extending along the entire circumference of the inner peripheral surface of the sleeve of the roll are provided in parallel, and the lengths of the flow paths in and out of the cooling grooves are made equal in each groove. It is possible to obtain a uniform flow velocity in the cooling groove without any gap. Since the flow rate is uniform, the profile of the cooling water flow path can be changed with respect to the increase or decrease in the amount of heat supplied to the roll surface. Furthermore, the roll of the present invention, in addition to making the pressure loss uniform, the water supply system and the drainage system are arranged symmetrically with respect to the roll axis, that is, evenly arranged at four equally spaced locations on the roll shaft peripheral surface. It also has the advantage of eliminating center runout.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of an internal water-cooled roll according to the present invention is shown in FIGS. 1 shows a cross section near one end face of the roll shaft, FIG. 2 is a cross section taken along line AA of FIG. 1, FIG. 3 is a cross section taken along line BB of FIG. 1, and FIG. 4 is a cross section taken along line CC of FIG. , Respectively. In the drawing, reference numeral 1 denotes a roll shaft, and a sleeve 2 is provided along the peripheral surface of the roll shaft 1, and cooling water flows between the two to form an internal water-cooled roll. A large number of cooling grooves 3 extending continuously in the circumferential direction of the roll are formed in parallel on the inner circumferential surface of the sleeve 2 in the roll axial direction. on the other hand,
As shown in FIG. 2, a cooling water supply port 4 is formed at one end of the roll shaft 1, and cooling water taken in from the water supply port 4 is supplied to water supply passages 5a and 5b extending in the roll radial direction. Is introduced into two water supply grooves 6a and 6b extending in the axial direction along the peripheral surface of the roll shaft. Here, the water supply groove 6a
And 6b are formed at positions symmetrical with respect to the roll axis. Furthermore, the cooling grooves 3a and 6b extend from the water supply grooves 6a and 6b.
The cooling water supplied into the inside is formed by two drain grooves 7a extending in the axial direction along the peripheral surface of the roll shaft, formed at positions 90 ° apart from the water supply grooves 6a and 6b in the circumferential direction of the roll. 7b, a drainage channel 8a extending in the radial direction of the roll shaft and
It is discharged from a drain port 9 provided at the other end of the roll shaft 1 through 8b.

The rolls shown in FIGS. 5 (a) and 5 (b) are further provided on the roll axis side of these grooves in order to stabilize the cooling water pressure in the water supply grooves 6a and 6b and the drain grooves 7a and 7b. This is an example in which water supply grooves 6c and 6d and drainage grooves 7c and 7d are provided to form a double structure, and other configurations are the same as those in the above-described embodiment.

Next, an amorphous alloy ribbon (composition: Fe ₇₈ B ₁₃ Si ₉ at%) having a width of 200 mm and a thickness of 21 μm was manufactured using the rolls shown in FIGS. Then, a change in the thickness in the ribbon width direction was examined. That is, the same amorphous alloy ribbon was manufactured using the roll according to the present invention and the roll having the structure disclosed in JP-A-59-54445, and the thickness change in the ribbon width direction was examined. According to the results of these investigations, as shown in FIG. 6, since the roll according to the present invention has a cooling ability with extremely excellent uniformity, the change in the thickness of the obtained ribbon in the width direction is extremely small.

In the above-mentioned roll according to the present invention, the widthwise flow velocity distribution of the cooling water was measured in the water supply groove and the drainage groove while changing the cooling water pressure at the water supply port variously. Was found to be within 15%, but with the conventional rolls described above, the range was 40%.
~ 60%.

[0017]

By using the roll of the present invention,
Thermal deformation of the roll surface is prevented, and the thickness distribution in the width direction of the quenched ribbon is made uniform, so that the conventional problem of manufacturing the quenched ribbon can be solved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a roll according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a sectional view of another roll according to the present invention.

FIG. 6 is a diagram showing a result of an examination of a sheet thickness deviation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll shaft 2 Sleeve 3 Cooling groove 4 Water supply port 5a, 5b Water supply path 6a, 6b, 6c, 6d Water supply groove 7a, 7b 7c, 7d Drainage groove 8a, 8b Drainage path 9 Drainage port

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shun Suhara 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Chiba Works (72) Inventor Kiyoshi Shibuya 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Inside Chiba Works, Ltd. (56) References: Hikaru 2-97941 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 11/06 370

Claims (3)

(57) [Claims] 1. An internal water-cooled roll comprising: a roll shaft; and a sleeve that covers a circumferential surface thereof and forms a flow path of cooling water between the roll shaft and the roll shaft. , continuously over the entire circumference of the roll
A plurality of extending cooling grooves are provided in parallel in the roll axis direction, and the circumferential surface of the roll shaft communicates with a water supply opening opened at one end of the roll shaft through a water supply passage extending in a radial direction of the roll shaft. The two water supply grooves extending in the axial direction are respectively formed along the peripheral surface of the roll shaft at positions symmetrical with respect to the roll axis, and the other end of the roll shaft is formed through a drainage passage extending in the radial direction of the roll shaft. Communicating with the drain opening at
An internal water-cooled roll wherein two drain grooves extending in the axial direction are formed along the peripheral surface of the roll shaft at positions 90 ° apart from the water supply groove in the circumferential direction of the roll shaft. 2. The roll according to claim 1, wherein the circumferential lengths of the cooling grooves are equal. 3. The roll according to claim 1, wherein each of the water supply groove and the drain groove has a double structure that overlaps in a radial direction of the roll.