JPH01245947A - Roll for producing rapid cooled strip - Google Patents

Abstract

PURPOSE:To uniformize cooling to roll shaft direction by assembling a roll shaft having water supplying water grooves at both ends and drainage grove at center part and a roll sleeve having plural number of cooling water flowing path grooves to the roll shaft direction at inner face of the circumference to make integrated construction. CONSTITUTION:The roll shaft 1c having the water supplying grooves I, I' to circumferential direction at both ends of surface layer part 1b and the drainage groove II at center part and the roll sleeve 1a having plural number of the cooling water flowing path grooves 11 along the roll shaft 1c direction at inner face of the circumference are assembled and integrated. Under such constitution, the cooling water introducing in the roll shaft 1c is injected from the water supplying grooves I, I' in the surface layer part 1b of the roll shaft to cool the lower face of the sleeve 1a. After that, the cooling water is strongly flowed in the drainage groove II at center part, to develop turbulent flow, and further, forcedly cool the sleeve. By this method, the roll can be uniformly cooled, and deformation caused by thermal expansion of the roll shaft direction can be minimized and the deviation of thickness for the rapid cooled strip can be made to small.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a roll for manufacturing a quenched ribbon using a twin roll method, particularly a quenched thin ribbon that has a good cooling effect with cooling water and is uniformly cooled in the width direction of the roll. This invention relates to rolls for manufacturing belts.

<Prior art> The roll cooling method for producing quenched ribbon has been developed in the past, for example, in JP-A-58
As disclosed in Japanese Patent No. 135751, cooling water is simply allowed to flow inside the roll in the axial direction of the roll, and the cooling water is drained from the portion where it is supplied into the roll sleeve.
There was a temperature difference between the roll sleeve and the roll sleeve, and the cooling ability on the roll surface was different in the roll axis direction.

Furthermore, in the roll disclosed in JP-A-57-171548, the flow of cooling water that determines the cooling capacity is from one direction, similar to the technique of JP-A-58-135751, and the roll The cooling capacity differs in the axial direction. In addition, this shape does not provide for thermal expansion, resulting in a very large roll crown.

On the other hand, the roll quenching method disclosed in Japanese Unexamined Patent Publication No. 58-29556 uses liquid boiling heat transfer for heat removal. In this method, the internal temperature of the roll sleeve is 10
The temperature is 0° C. or higher, which causes the surface temperature to become even higher, making it extremely likely that cracks will occur. In addition, in this structure, roll crown occurs due to thermal expansion, so the shape of the quenched ribbon produced is non-uniform, making it unsuitable for ribbon production.

<Problems to be Solved by the Invention> As mentioned above, conventional rolls for producing quenched ribbons have the following problems:
■Since the roll surface temperature was high, there was a problem that roll cranks often occurred due to thermal fatigue, so the present invention
This was done in order to solve these problems and provide a roll for producing quenched ribbons that has a small roll crown and a low roll surface temperature.

<Means for Solving the Problems> The present invention provides a method for producing rapidly cooled ribbon that is integrated by combining a roll surface layer on the outer periphery of a roll shaft and a roll sleeve on the outer periphery, and is forcibly cooled with cooling water. The roll shaft has a plurality of cooling water supply holes extending from the center of the roll width of the shaft center water supply hole toward the outer circumferential surface perpendicularly to the roll axis;
A cooling water drainage hole is carved from the outer peripheral surface toward the shaft center drainage hole, and the roll surface part is connected to the roll shaft cooling water supply hole, and the roll runs toward the water supply groove provided on the circumference at both ends. The CI-)Lt sleeve has a cooling water supply hole along the axis, and a cooling water drainage hole connected to the roll shaft cooling water drainage hole from a drainage groove provided on the circumference of the center part. This is a roll for producing a quenched ribbon, characterized in that a plurality of cooling water flow grooves are formed on the inner circumferential surface along the roll axis.

<Function> The present invention is used in a rapid solidification apparatus using a twin roll method, and the structure of the roll according to the present invention will be explained here.

FIG. 5 shows a process for manufacturing a quenched ribbon using the roll according to the present invention. Molten steel 4 is injected from nozzle 2 and roll 1
It is cooled to become a thin ribbon 3.

The roll 1 is forcibly cooled from the inside with cooling water. The structure of the roll 1 is shown in Figs. From there, it passes through the shaft center water supply hole 8 and enters the roll shaft IC.

The water that has entered the roll shaft 1c flows through the cooling water supply holes a, a',
b, b' to the roll shaft surface layer 1b, and is provided on the circumference of both end portions of the roll shaft surface layer ib and the roll sleeve 1a. M is divided into rows.

Cooling water is supplied to the water supply groove 1. After passing through the cooling water flow path groove 11 in the roll sleeve la from I', it is collected in the drainage groove ■ in the center of the roll, and the cooling water drain hole C9c l in the roll shaft 1c from the surface layer 1b of the roll. Axial drainage hole9. The cooling water flows out through the cooling water outlet 10 and the rotary joint 5'.

Perspective views of the roll shaft 1c, roll surface layer 1b, and roll sleeve 1a are shown in Figures 2, 3, and 4, respectively.
Shown in the figure. Figure 2 shows the flow of cooling water on the roll shaft. Cooling water enters from the cooling water supply lower at the shaft end on one side and passes through the shaft center water supply hole 8, cooling water supply holes a, a'
, b, b', the cooling water leaks to the roll surface layer (,
Cooling water that has entered from the surface layer of the roll enters the roll shaft through the cooling water drainage holes c and c', passes through the shaft center drainage hole 9, and passes through the cooling water discharge port 10 at the end of the shaft on the other side. There is a better choice.

FIG. 3 shows the surface layer of the roll. I and I' are water supply grooves provided on the surface layer, and ■ is a drainage groove, through which cooling water flows around in the circumferential direction, and cooling water supply holes a and a.
The cooling water entering from ', b, b' is in the water supply groove 1. I' and then enters the central drainage groove H. As a result, the cooling water collides violently against the roll sleeve la at both ends of the roll surface layer lb, resulting in forced cooling due to turbulent flow.

In addition, the roll sleeve according to the present invention has cooling water flow grooves 1 in the form of slits along the roll axis direction, as shown in FIG.
1 is engraved, thereby uniformly cooling the inside of the mouth in both the axial direction and the circumferential direction. In addition, this roll sleeve has a structure in which grooves and lips alternate, so it has high strength, and is therefore extremely durable and strong against the stress of shrink fitting and the pressure applied during pouring.

<Example> 5th rj using the roll of the present invention! A manufacturing test was conducted using the manufacturing process shown in J. The implementation conditions at this time are shown in Table 1.

As a result of the implementation shown in Table 1, 1 ton of a plate with a thickness of 250u and a plate width of 500+a was manufactured.

The data on the amount of roll crown during pouring is shown in FIG. 6. In this example, only about 40n of roll crown was generated.

Comparative Example 1 for comparison. Comparative Example 2 was carried out. 1. In Comparative Example 1, a conventional roll using the roll sleeve shown in Fig. 8 was used, and in Comparative Example 2, a conventional roll using a roll sleeve shown in Fig. 9 was used. In each case, quenched ribbons were produced under the same conditions as in the examples.

In Comparative Example 1, a simple cylindrical roll sleeve was used, so the roll crown amount was about 40 On at the center and both ends, and in Comparative Example 2, the amount of roll crown was about 40 On at both ends because the cooling water did not move from both ends to the center like in the present invention. The plate obtained by the present invention has a plate thickness of 250 mm.
The deviation was within 30μ at n, and the plate shape was also good.

Further, the results of roll surface temperature measurement are shown in FIG. In the examples, the roll surface temperature was extremely low, thereby reducing the thermal load placed on the roll itself. Therefore, no roll crank occurred. In Comparative Example 1, the temperature at both ends was higher than at the center. Further, at this time, there were 4 to 5 cracks per LCD with lengths of 1 or less at both ends. In Comparative Example 2, cracks were observed throughout.

<Effects of the Invention> When the roll for producing quenched ribbon according to the present invention is used, the amount of roll deformation is extremely small, and in particular, the amount of thermal expansion of the roll is almost uniform in the width direction of the roll, so quenching with extremely little thickness deviation can be achieved. A thin ribbon can be produced. Furthermore, since the surface temperature of the roll is low, roll cranking due to thermal fatigue is less likely to occur, making it possible to produce rapidly quenched ribbon with good economic efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front and plan sectional view of a roll according to the present invention,
2 is a perspective view of a roll shaft according to the present invention, FIG. 3 is a perspective view of a roll surface layer according to the present invention, FIG. 4(1) is a perspective view of a roll sleeve according to the present invention, and FIG. ) Figure 4 (
1) An enlarged internal view of the figure, Figure 5 is an explanatory diagram of the manufacturing process of the quenched ribbon, Figure 6 is a graph showing the relationship between the roll width and roll crown during the production of the quenched ribbon, and Figure 7 is the quenched ribbon. Graphs showing the relationship between roll width and roll surface temperature during manufacture, and FIGS. 8 and 9 are both perspective views showing conventional roll sleeves. DESCRIPTION OF SYMBOLS 1... Roll, la... Roll sleeve, 1b... Roll surface m part, lc... Roll shaft, 2... Nozzle, 3... Thin strip, 4...
... Molten steel, 5.5゛... Rotary joint, 6... Housing, 7... Cooling water supply port, 8... Shaft center water supply hole, 9... Shaft center drainage hole, 10 ...Cooling water outlet, 11...Cooling water channel groove, a, a'...
Cooling water supply hole, b, b'...Cooling water supply hole, c, c'...Cooling water drain hole, 1.1'...Water supply groove, ■...Drainage groove. Patent applicant Kawasaki Steel Corporation Figure 1 Figure 2 Figure 3 Figure π Figure 4 Figure 5 Figure 6 Figure 7 Rono L41i1Lll1m)

Claims (1)

[Scope of Claims] A roll for producing quenched ribbon that is integrated with a roll surface layer on the outer periphery of a roll shaft and a roll sleeve on the outer periphery, and is forcibly cooled with cooling water, the roll shaft comprising: a plurality of cooling water supply holes extending from the center of the roll width of the shaft center water supply hole toward the outer circumferential surface at right angles to the roll axis;
A cooling water drainage hole is carved from the outer peripheral surface toward the shaft center drainage hole, and the roll surface is connected to the roll shaft cooling water supply hole, and the roll runs toward the water supply groove provided on the circumference of both ends. A cooling water supply hole is provided along the shaft center, and a cooling water drainage hole is carved from a drainage groove provided on the circumference of the center part to connect with the roll shaft cooling water drainage hole. A roll for producing quenched ribbon, characterized by having a plurality of cooling water flow grooves carved on the inner surface along the roll axis.