KR101075912B1 - Cooling device with helical cooling tubes and heat pipes in a single roll caster - Google Patents

Abstract

The present invention improves the quality of the finished alloy material by further cooling the single roll on the inner circumferential surface of the single roll in the form of a sleeve used when manufacturing the amorphous alloy material, as well as extending the service life of the single roll. The cooling device of the single-roll casting machine with improved cooling ability, the configuration is, in forming a cooling device inside the single roll (7) in the form of a sleeve for manufacturing amorphous alloy material (5), 7) Cylindrical cooling means 10, in which a cooling fluid is accommodated, is installed to rotate together with the single roll 7 in the form of a sleeve on the inner circumferential surface thereof with a width W corresponding to the width W of the single roll.

Amorphous alloy material. Single roll. Cooling means. Cooling fluid

Description

Cooling device with helical cooling tubes and heat pipes in a single roll caster}

1 is a schematic view showing a single roll casting machine for manufacturing an amorphous alloy material,

Figure 2a and 2b is a schematic diagram for explaining the cooling structure of a single roll manufacturing a conventional amorphous alloy material,

3 is an exploded perspective view of a first embodiment for explaining a single roll cooling structure of the present invention;

4A and 4B are cross-sectional and longitudinal cross-sectional views of FIG. 3 of the present invention;

5 is an exploded perspective view of a second embodiment for explaining a single roll cooling structure of the present invention;

Figures 6a and 6b is a cross sectional longitudinal cross-sectional view of the present invention,

Figure 7a is a roll surface temperature history and steady state roll cross-sectional temperature distribution calculated in accordance with an embodiment of the present invention 7b.

    ※ Code explanation for main part of drawing ※

1: Ladle 2: Molten steel

3: copper layer 4: rotation axis                 

5: alloy material (strip) 6: winding machine

7: single roll 8: cooling hole

9 nozzle 10 cooling means

11: cylindrical tube 11a: hollow part

12 cooling pipe

The present invention relates to a cooling apparatus of a single roll casting machine having improved cooling ability, and more particularly, to an alloy manufactured by further effectively cooling the single roll on a single roll inner circumferential surface in the form of a sleeve used when manufacturing an amorphous alloy material. It not only improves the quality of the material, but also extends the service life of a single roll.

In general, an alloy casting machine for manufacturing a ladle (1) for supplying the molten steel (2), the appropriate pressure, the flow rate of the molten steel, and the shape and size of the amorphous alloy material (5) to be manufactured as shown in FIG. A nozzle 9, a cooling hole 8 for cooling a single roll for casting 7 rotating at a high speed, a rotation shaft 4 connected to a motor for driving the single roll, and a winding machine 6 for winding an alloy material to be manufactured. Consists of a configuration including a.

Producing using a single roll (7) used in the alloy material manufacturing casting machine configured as described above is mainly an alloy type, in particular, among the alloy steel produced using the single roll (7), the amorphous alloy material (5) is a metal In the molten state, rapid cooling of about 103 to 10O K / Sec causes solidification of the alloy into an amorphous alloy in a disordered state without giving time for the atoms of the alloy to crystallize regularly.

One of the most important operating factors in the amorphous alloy casting is a problem of rapidly solidifying the molten steel (2) but inducing stable growth of the initial amorphous alloy material (5). In order to meet these requirements, the proper surface temperature distribution of the single roll 7 for about 1 minute is very decisive when the amorphous alloy material 5 starts to contact the single roll 7 for casting at the beginning of casting. do. In other words, a certain degree of transient state is inevitable until the normal casting is achieved until the amorphous alloy material 5 of good quality is developed.

Therefore, in the initial stage of solidification, the molten steel 2 of high temperature (about 1,230 ° C.) contacts the surface of the casting single roll 7 that rotates at high speed, so that the inside of the single roll 7 is circumferential as well as the width direction. In addition, severe temperature gradients occur, which results in structural degradation due to deterioration of the die roll 7 as well as initial quality deterioration of the amorphous alloy material 5. It will play a role.

Therefore, conventionally, copper having a very large heat transfer coefficient is applied to the surface of a single casting roll as shown in FIGS. 2A and 2B to suppress heat deformation of the single roll 7 and remove heat of the high temperature amorphous alloy material 5. The copper layer 3 is attached to the copper layer 3 so that a certain amount of cooling water flows through the cooling holes 8 in the copper layer 3, or by supplying the cooling water through the roll cooling nozzle 7a at the center of the amorphous single roll. The method of cooling the inside of the roll 7 directly was used.

However, the conventional cooling method of the single roll for casting 7 is not only focused on the role of preventing the deterioration of the single roll 7, but also requires an appropriate cooling rate (103 to 10 6 K / Sec) or more. In the manufacture of the alloy, it was fundamentally necessary to have a separate cooling device for improving the cooling ability of the single roll (7).

In addition, during initial casting and normal casting, the surface temperature gradient in the circumferential direction of the single roll and the temperature gradient in the width direction were almost impossible, and the coolant flow rate and pressure change using the straight cooling hole 8 of FIG. There was a limit to increase the cooling effect alone.

The present invention has been made to solve the above problems, the object of the present invention is to improve the quality of the finished material, as well as to improve the quality of the finished material by more effectively cooling the single roll used when manufacturing the amorphous alloy material In order to prolong the service life of the cylindrical cooling means is provided on the inner circumferential surface of the single roll to provide a cooling device of the improved single-roll casting machine.

In order to achieve the above object, the cooling device of the single roll casting machine having improved cooling ability of the present invention is characterized in that, in forming a cooling device inside a single roll in the form of a sleeve for manufacturing an amorphous alloy material, the inner surface of the single roll in the form of a sleeve The cylindrical cooling means in which the cooling fluid is accommodated in the inside having a width corresponding to the width of the single roll is installed so as to rotate together with the single roll of the sleeve form, the cooling means installed in the single roll of the sleeve form, the Cooling pipes for circulating cooling water are arranged at regular intervals on the inner circumferential surface of a single roll, and a cylindrical tube having a hollow portion for receiving a cooling fluid therein is installed on the inner circumferential surface of the cooling pipe, and the body of the cylindrical tube is made of microporous material. The outside of the cylindrical tube made of microporous prevents leakage of cooling fluid And sealing process, the arrangement of the cooling pipes arranged in the predetermined intervals is wound in a spiral form, wherein the cooling fluid is either a rapid heat transfer liquid freon, ammonia, acetone, ethanol, and stained for the group.

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When described in detail with reference to the accompanying drawings, the cooling apparatus of the single roll casting machine having improved cooling ability of the present invention having such a feature as follows.

Figure 3 is an exploded perspective view of a first embodiment for explaining a single roll cooling structure of the present invention, Figures 4a and 4b is a side cross-sectional view of the combination of Figure 3 of the present invention, Figure 5 is a single roll cooling structure of the present invention 6A and 6B are cross-sectional longitudinal cross-sectional views of FIG. 5 of the present invention, and FIG. 7A is a roll surface temperature history and normal calculated in accordance with an embodiment of the present invention. It is a roll cross section temperature distribution map of a state.

First, the cooling means 10 is installed in the inner peripheral surface of the single roll 7 in the form of a sleeve having a width W ′ corresponding to the width W of the single roll 7. 3 and 4a and 4b is composed of a cylindrical tube 11 having a hollow portion 11a formed therein, the cooling means 10 of the cylindrical tube 11 is the single roll (7) It is inserted in the inner width direction of the is installed so as to be integral with the single roll (7) so that when the single roll (7) is rotated together.

In addition, a hollow portion 11a is formed inside the cooling means 10 formed of the cylindrical tube 11, and a cooling fluid is filled therein. The cooling fluid filled in the hollow portion 11a is filled in a vacuum state. The charged cooling fluid may include freon, ammonia, acetone, ethanol, water and the like. In addition, the body of the cylindrical tube 11, the cooling means 10 is formed of a microporous body, the outer body of the cylindrical tube 11 of the porous body was sealed to prevent leakage of the cooling fluid.

When the molten steel 2 is supplied from the ladle 1 to the outer upper part of the single roll 7 in order to cast the alloy material 5 using the single roll 7 provided with the cooling means 10 as described above, the supply is performed. The predetermined part becomes the high temperature part (H) and the remaining part becomes the low temperature part (L).

In this case, the cylindrical tube 11, which is the cooling means 10, has a temperature gradient. The cooling fluid located in the hot portion H, that is, the molten steel 2 injection portion of FIG. 4B is evaporated, and the latent heat of the evaporated gas is quite large. Due to the small temperature difference, the evaporation gas moves very rapidly, condenses in the low temperature portion (L), releases latent heat, and the liquefied cooling fluid returns to the high temperature portion (H) through the porous body in which the capillary principle is applied.

If the above operation is repeated, it is several hundred times higher than the case of the revolver cooling hole type which cools a certain amount of cooling water through the cooling hole 8 in the same copper layer 3 that is conventionally used when converted into thermal conductivity. Heat exchange takes place naturally with the heat conductivity leading to the uniform temperature distribution of the surface of the single roll 7 in the circumferential direction.

Further, as shown in FIGS. 5 and 6A and 6B, the cooling pipe 12 is circumferentially disposed between the cylindrical tube 11 having the hollow portion 11a formed therein and the inner circumferential surface of the single roll 7. Cooling means 10 is wound up to maintain a spiral shape along the cooling pipe 12 is a cooling of a single roll (7) that is heated by allowing the coolant to be circulated while maintaining a constant pressure and quantity of water therein. To be more effective.

When the cooling pipe 12 is installed as described above, heat is increased due to an increase in the heat absorption force and a decrease in surface temperature due to an increase in the contact area with the body of the single roll 7 and an increase in the momentum of the coolant due to the self-rotation force of the single roll 7. The amount of deformation is considerably smaller than in the case of using a revolver cooling hole type in which a predetermined amount of cooling water is cooled through the cooling holes 8 in the conventional copper layer 3.

Hereinafter, the present invention will be described with reference to Examples.

[Example]                     

In order to confirm the usefulness of the present invention, a numerical simulation of a casting machine composed of conventional forced cooling tubes is performed. The results are shown in FIGS. 7A and 7B.

As can be seen in FIG. 7A, the surface temperature of the single roll 7 reaches a steady state shortly after 10 minutes and about 20 minutes after the start of casting. Even in a steady state, in the contact section with the alloy material 5 It could be confirmed that there was a temperature gradient that could not be narrowed.

Therefore, in order to solve this problem, the present invention uses the spiral cooling pipe 12, which is the cooling means 10, instead of the conventional forced circulation cooling tube, and at the same time the cylindrical tube 11 inside the single roll 7 By installing the roll 7 in the circumferential direction, it is possible to give a more improved heat removal ability than the conventional cooling hole type, and to achieve a uniform temperature distribution in the circumferential direction and the width direction of the single roll 7. This resulted in the improvement of the quality of the alloy material (5), as well as the productivity and the reduction of the roll maintenance cost due to the extension of the life of the casting roll.

However, the cooling fluid is to operate in a temperature range of 20 ~ 400 ℃, the hollow portion (11a) was maintained in a vacuum of about 10 ^-4 torr.

The present invention as described above is installed on the inner circumferential surface of the single roll to rotate together with the single roll, thereby more effectively cooling the single roll to improve the quality of the finished alloy material, as well as the service life of the single roll And the productivity is improved.

Claims (5)

In forming a cooling device inside a single roll 7 in the form of a sleeve for manufacturing an amorphous alloy material 5, Cylindrical cooling means 10, together with a single roll 7 in the form of a sleeve, on the inner circumferential surface of the single roll in the form of a sleeve, having a cooling fluid therein, the width of which corresponds to the width W of the single roll. Is rotated, The cooling means 10 installed inside the single roll 7 in the sleeve form has a cooling pipe 12 in which cooling water is circulated on the inner circumferential surface of the single roll 7 at regular intervals, and the cooling pipe 12 ) Is installed inside the cylindrical tube 11 formed with a hollow portion (11a) for receiving the cooling fluid and the body of the cylindrical tube 11 is made of microporous, of the cylindrical tube 11 made of the microporous The outside is sealed to prevent leakage of the cooling fluid, the arrangement of the cooling pipes 12 arranged at a predetermined interval is wound in a spiral form, the cooling fluid is a fast heat transfer liquid Freon, ammonia, acetone Cooler of the improved single roll casting machine, characterized in that any one of the ethanol. delete delete delete delete

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