JPS62220248A - Horizontal type continuous casting method for casting billet - Google Patents

Abstract

PURPOSE:To improve the productivity of casting billet by pushing out cooling water brought into contact with the casting billet surface through gas flow toward the casting billet drawing direction. CONSTITUTION:A cooling cylinder 5 having cooling water injecting hole 6 and gas injecting hole 7 at an outlet side thereof is arranged to a hollow mold 1 with built-in exothermic body 2. After setting a dummy bar 12 for the casting billet at the center of the cooling cylinder 5, the dummy bar is brought into contact with the molten metal 3 in the mold 1 and also drawn out softly. Then, water is injected from the cooling water injecting hole 6, while injecting air or gas toward right side from the gas injecting hole 7. The cooling water is shifted toward right side passing through the gap between the casting billet 4 and the cooling cylinder 5 to flow in a water receptor 10. In this way, as the cooling water is pushed out by the air, etc., water leakage toward the mold is perfectly prevented. Therefore, as casting speed is increased without any danger of the mold cooling, the productivity of the casting billet 4 is improved.

Description

Detailed Description of the Invention The present invention is based on a heated mold continuous casting method (Patent No. 104914).
This article relates to a method for cooling an ingot when applying No. 6) to a horizontal continuous casting method.

More particularly, it relates to a method in which an ingot drawn horizontally from a mold can be cooled without water flow to the mold outlet or cooling of the mold by steam.

Currently, molten metal is supplied into a hollow heating mold with built-in heating means, and a dummy ingot is used to adhere to the molten metal in the mold.
The continuous casting method is a method in which solidified metal is continuously formed at the tip of the dummy ingot by pulling out the dummy ingot.
Since the ingot surface completes solidification immediately outside the mold, the ingot has a perfect unidirectional solidification structure, has no central defects such as cavities, bubbles, or macro segregation, and has a beautiful mirror surface. It is attracting attention as a manufacturing method.

However, by applying this method, the horizontal type Vt of the ingot is
When casting, water leaking from the inlet of the water cooling device adheres to the bottom surface of the ingot and moves toward the mold, which cools the mold, lowering the temperature of the inner wall below the mold outlet, and causing water to leak on the inner wall of the mold. There was a problem in that the molten metal started to solidify and the friction between the mold and the ingot often caused cracks on the lower surface of the ingot.

Therefore, it has been difficult to bring the water cooling device closer to the mold outlet and increase the casting speed. Furthermore, as the casting speed of the ingot increases, the generation of steam at the inlet of the water cooling equipment increases.
The cooling of the mold outlet by water vapor leaking from the water cooling system causes cracks to occur on the surface of the ingot.Horizontal continuous casting requires high productivity unless cooling of the mold by water vapor is prevented. It has been considered extremely difficult when

A possible method to prevent water and steam from leaking from the water cooling device to the mold side is to provide a resilient backing on the water cooling device inlet side and move the ingot into the water cooling device while keeping it in close contact with the banking. . However, this can be used if the ingot is completely smooth, but the cross-sectional shape of the ingot changes during the casting process. When it changes and becomes smaller,
There is a risk of water or steam leaking toward the mold from the gap between the backing and the ingot.

For this reason, in the conventional horizontal continuous casting method, the water cooling device had to be installed at a sufficient distance from the mold to prevent water leakage from the water cooling device and cooling of the mold by water vapor.

For this reason, the horizontal heating mold type continuous casting method cannot achieve high casting speeds and has poor ingot productivity. There has been a strong demand for the development of

The present invention provides a method for cooling an ingot using water, which effectively cools the ingot and eliminates the risk of water leakage or steam leakage to the mold side, in such a horizontal continuous casting method of an ingot. It is something. In other words, a hollow cooling cylinder through which the ingot can pass is used, and a cooling water jet hole is provided on the inner surface of the cylinder, which is inclined in the direction in which the ingot is drawn out. Furthermore, a gas jet hole is provided on the ingot inlet side of the cooling water jet hole that is inclined toward the ingot withdrawal direction to remove water leakage and water vapor with air or a gas such as argon or nitrogen. This is a method of pushing it into a water cooling device.

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a cooling device used to carry out the method of the present invention.

In the figure, ■ is a hollow mold containing a heating element (■), and molten metal (■) is supplied from the left side. ■ is an ingot pulled out in the direction of the arrow. ■ is a cooling cylinder, and on the ingot inlet side there are cooling water jetting holes (■) that are inclined in the casting direction of the ingot, that is, to the right in the figure, and on the ingot inlet side, there are gas jetting holes (■) that are tilted diagonally to the right at appropriate intervals. It is set aside.

Cooling water ■ for cooling the ingot ■ pulled out from the mold in the direction of the arrow moves from the inlet ■ through the cooling water spout hole ■ to the right while contacting the surface of the ingot 0, and from the right end of the cooling tube ■. The overflowing basin allows water to flow out of the container.

Send compressed air or gas from the air outlet ■ to prevent cooling water from leaking from the gap between the ingot and the cooling cylinder to the left, that is, to the mold side, and blow out the air or gas diagonally to the right from the gas outlet ■. It has become. The steam generated by the cooling of the ingot (■) is discharged to the right along with the water flow.

A cooling cylinder configured like this is a heating means (heating element).
It is installed so that it is located on the right side of the hollow mold that contains the ■.

Next, the operation will be described.

First, the cooling cylinder (2) is set with an appropriate distance from the mold (2).

Next, the ingot dummy 〇 is moved to the left so that it is located in the center of the cooling cylinder 〇, and after it comes into contact with the molten metal 〇 in the hollow part of the mold 〇, it is gently pulled out.

In that case, first, while air or gas is jetted to the right from the gas jet hole ■, water is spouted from the cooling water jet hole ■, and the cooling water is moved to the right through the gap between the ingot ■ and the cooling tube ■. The water will overflow from the right end of the cooling cylinder, and the water will flow out through the outlet of the container [phase].

At this time, the ingot (■) is drawn out while coming into contact with the cooling water (■). By adjusting the blowing air pressure so that the wind pressure is greater than the water pressure directed to the left of the cooling water at the position of the gas outlet ■ of the cooling cylinder ■, the cooling water that comes into contact with the ingot ■ is blown from the left to the right. Alternatively, the gas will push it to the right, completely preventing water from leaking into the mold.

As explained in detail above, the present invention cools the ingot by the water flow that comes into contact with the ingot surface and moves in the casting direction, so the cooling effect is high. The air or gas ejected from the facing gas outlet is sure to prevent water from leaking to the mold side.
Casting can be performed without cooling the mold due to cooling water leaks or steam leaks.

The present invention relates to horizontal continuous casting of ingots, and conventionally it has been considered difficult to increase the casting speed of ingots without causing casting cracks due to the risk of cooling the mold due to water leakage or steam leakage. In addition, water cooling of the ingot directly outside the mold was made possible.
This method is revolutionary in that it can significantly improve the productivity of ingots.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an apparatus showing an embodiment of the cooling method for horizontal continuous casting of ingots according to the present invention. 1. Mold 20 Heating element 3. Molten metal 4. Ingot 5, cooling cylinder 6. Cooling water outlet 7, gas outlet 8. Cooling water 9. Inlet 10, water receiver is a container 11. Air outlet 12. Ingot dummy/ Tsui

Claims (1)

[Claims] A horizontal continuous casting method for an ingot using a heating mold, characterized in that cooling water in contact with the surface of the ingot is pushed out in the direction of drawing out the ingot using a gas flow.