JPS5927366B2 - Rapid continuous cooling method and device for high temperature wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for rapid continuous cooling of hot wire.

The problem of cooling the wire is downstream of all equipment for thermal continuous processing, especially at the exit of continuous tempering where rapid cooling is required before winding as a wire product.

This problem also exists at the outlet of certain metallurgical devices with continuous flow.

The product of this metallurgical device, a wire rod, must be cooled very quickly to prevent the precipitation of certain metallurgical textures.

The above-mentioned problem can be solved by using steel wire or aluminum wire under certain conditions.
The use of a high pressure fluid device as disclosed in French Patent No. 2261816 by NEY and BERTI
This is usually solved by using a dispersion device under high pressure with an emulsion of water and compressed air as disclosed in French Patent No. 2 290 977 by E.

For example, difficulties remain when cooling a wire made of relatively high temperature, such as brass or steel, which has a tempering temperature of 500° C. or higher.

If the wire emerges from the water flow chamber very hot because it is instantly surrounded by steam which insulates it from the cooling water flux, the solution of passing the hot wire through the water flow chamber without reverse circulation is It has been proven to be ineffective.

Assuming 5.5 # diameter brass is removed, passed at a rate of 5 meters per second in a continuous tempering unit heating with 70 volts and 6000 amps, or 0.42 MW of work, and cooled in a cooling unit. The heat flux is 0.4210.5X3,14X5,5XIO-48,5
MW/rr? It is calculated as follows.

Such a heat flux is the theoretical value of 5MW/lr in conventional equipment? However, this 5
MW/W? The 5 value is usually an overestimate of the actual value of watering around the wire.

In the method according to the invention, it is possible to continuously cool a wire at a temperature of 800 to 1000 DEG C., and the effect is remarkable when a wire at a temperature lower than the above range is introduced.

A hot wire circulating in a narrow passageway having a depth of at least twice the diameter of the wire and a width of at least four times the diameter of the wire, a layer of water occupying the entirety of the passageway on both sides of the wire. , the velocity of the water layer in the passageway may be at least 10 meters per second, preferably at least 50 meters per second, preferably at least 100 meters per second (the direction of the water flow being approximately perpendicular to the direction of the wire). The above objects are achieved by a method for rapid continuous cooling of hot wires, which is characterized in that:

This high velocity removes the obstruction created by steam envelopment, so that the transfer of thermal calories is smoothed between the wires and the cooling water.

That is, in the method of the present invention, by applying cooling water at an extremely high speed (at least 10 meters per second) perpendicular to the axial direction of the wire, the wire can be cooled extremely efficiently compared to the conventional technology. It is.

Further, the cooling device of the present invention has a configuration that allows high-speed cooling water to be applied perpendicular to the axial direction of the wire as described above.

In another embodiment of the invention, this is ensured by two layers of water of equal volume, the speed of the water layers being equal but in opposite directions, one of these layers being the first layer of the wire. The other layer acts on the second layer, the length of the first part and the length of the second part are almost equal, the pressure on the wire is balanced, and the trajectory of the wire is not bent. do not have.

The device according to the invention using said cooling method comprises an inlet and an outlet for the wire to be cooled, at least one water inlet chamber and at least one water outlet chamber, the amount of water flowing out is small (both water contains a container equal to the amount introduced.

A narrow passage is used for the acceleration of water and is a passage having a depth of less than (both twice) and a width of at least four times the diameter of the wire.

In one embodiment, the container has a partition wall,
The introduction chamber and the discharge chamber are divided into almost equal volumes.

Next, the present invention will be explained based on the drawings.

The cooling container 1 has a cylindrical shape.

The cooling vessel has an inlet 2 and an outlet 3 allowing circulation of the wire 4.
and two inlets 5 and 6 for cooling having a large cross-sectional area and capacity, and two discharge chambers (one discharge chamber is designated in FIG. 2 by reference numeral 9) from each lower outlet, It has 8.

The flow rate in the discharge chamber 9 is at least equal to the flow rate in the introduction chamber 10, in order to avoid dangers due to stasis.

The partition walls 11 and 12 divide the container into two parts.

The two walls are slightly spaced apart to avoid interference between the water layers.

A narrow passage 13 in which the wire to be cooled circulates
The velocity of water injected under pressure through inlets 5 and 6 is increased.

A deflection surface 14, which is symmetrical to the discharge chamber on the other side, returns the water through the outlet lower to a storage chamber (not shown) and a circulation channel (not shown).

The deflection surface 14 is a flat surface, and the arrow F shown in FIGS. 1A, 2, and 3 indicates the outflow direction of water (toward the left in the paper).
The water flowing out in this direction flows into the external storage chamber.

Deflection devices 15 and 16 prevent water from flowing out along the wire trajectory.

Air flows 17 and 18 that impinge radially on the wires and circulate in passages 19 and 20 can be fed to the input and output of the cooler in order to prevent water from escaping.

A small section (21) is made on one side of the container and is removable to facilitate extrusion.

The reason why the container is divided into two parts by the partition walls 11 and 12 is to balance the pressure of water acting on the wire 4.

In FIG. 1, the water flowing in from the inlet 6 presses the wire 4 downward, and the water flowing in from the inlet 5 presses the wire 4 upward, and the pressure of the water acting on the wire 4 is almost zero in total from the inlet 2 to the outlet 3, and the trajectory of the wire 4 is not bent.

The shapes of the water introduction chamber and the water discharge chamber can be modified by avoiding shapes with extremely acute angles.

In particular, the introduction chamber may be shaped as shown at 22.

Similarly, the introduction and discharge chambers are of circular, parabolic, hyperbolic, etc. shaped profiles 23 symmetrical with respect to the wire to facilitate the supply of water to the wire in order to accelerate the cooling water layer; It can also be shaped to expand at the outlet to facilitate discharge.

Illustration The cooling vessel was constructed as described above.

The diameter of the container is 0.57? Z, depth was 0.2 m.

The cooling passage had a thickness of Trrrm and a width of 0.5 m.

The two introduction chambers were supplied with water at a pressure of 2 bar and a total flow rate of 50 t/See.

The velocity of each water layer is approximately 15 m/see.

In the first experiment, a brass wire was introduced into the vessel, its diameter was 5.5 rrvn, and the velocity was 5 m/sec.
It was circulated in

Calculated as above, 70V. 6000 A? ? Z
So 48.5MW/lt? The brass wire comes out of a continuous tempering device heated by a current of .

The temperature of the wire when entering the cooling device was 650°C.

On leaving the vessel, the wire was completely cooled, the difference in water temperature between discharge and introduction being 2°C.

In the second experiment, the width of the passage 13 was 3rrr! n and a copper wire with a diameter of 1 rML was used.

The wire came from a continuous tempering unit circulating at 30 m/see and delivering 72 mm.

This heat flux removed is calculated as 4 by calculations similar to those above.
5.8 MW/rrt'.

The wire introduced into the cooling device at about 600° C. came out completely cooled.

In the third experiment, a stainless steel wire containing 18 Cr and 10% Ni and having a diameter of 1 rIa was used.

8m/se at about 1000℃ from 22 continuous tempering equipment
The wire comes out at c.

In this case, the heat flux is 14MW/rr? Met.

Also, in this case, the wire comes out completely cooled,
The increase in water temperature was measured at 0.2°C at the inlet and outlet.

At this time, the speed of the water layer was measured to be 18 m/sec.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a cooling container having a partition wall, FIG. 1A is a right side view of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along line B, and FIGS. 3 and 4 are sectional views of the cooling container when the introduction chamber and the discharge chamber have a diverging shape. In the figure, 1... - Cooling device, 2... Inlet,
3...exit, 4...-wire, 5...
...Entrance, 6...Entrance, 1...Exit,
8...exit, 9...discharge chamber, 10...
...Introduction room, 11.12...Shikiri wall, 1
3... Narrow passage, 14... Deflection surface, 1
5,16...Deflection device.

Claims (1)

Claims: 1. A hot wire circulating in a narrow passage having a depth of at least twice the diameter of the wire and a width of at least four times the diameter of said wire, so as to occupy the entire passage. a high-temperature wire, characterized in that the velocity of the water layer in the passageway is small (approximately 10 meters per second) and the direction of flow of the water layer is approximately perpendicular to the direction of the wire; 2. A method for rapid continuous cooling of a hot wire according to claim 1, characterized in that the velocity of the water layer in the passage is at least 50 meters per second. 3. two layers of water are provided towards the wire, one layer of water acting on a first portion of the wire and another layer of water acting on a second portion of the wire. 4. A method for rapid continuous cooling of a high temperature wire according to claim 1 or 2.4. a water discharge chamber having a depth at least twice the diameter of the wire to be cooled and a width at least four times the diameter of the wire, substantially perpendicular to the direction of circulation of the water; 5. A device for rapid continuous cooling of hot wires, characterized in that it comprises a container with a narrow passage arranged in the container. 6. A rapid continuous cooling device for a high temperature wire according to claim 4, characterized in that the device comprises means for introducing and discharging water.6. A rapid continuous cooling device for high-temperature wire according to claim 4 or 5.