JPS5933057B2 - Mold for continuous metal casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mold for continuous casting of molten metal.

The inventors of the present invention first divided the part of the mold in contact with the metal to be cast into a plurality of parts in a mold with both ends open for continuous casting of molten metal, and vibrated each part. 5-50KH to any one of the plurality of divided molds connected by means of blocking and in contact with the metal to be cast.
We have proposed a mold for continuous metal casting that is connected to a vibration generator that generates vibrations of z.

(Japanese Patent Application No. 53-19455) This proposal is a mold that can reduce oscillation marks on slabs, reduce surface flaws, can be applied to a variety of mold shapes, and can reduce the amount of incident energy. It provides:

That is, the mold moving part to which high frequency vibration is applied is, for example,
Distribute them at several locations in the height and width directions to reduce the frictional force between the mold moving parts and the slab on average, or
Another feature is that it can be freely selected, such as applying vibration intensively to the area where the frictional force is greatest.

The present invention is a further improvement of the above-mentioned mold, and its gist is that the wall surface in contact with the metal to be cast and the cooling water box of the open type continuous casting mold that applies high frequency vibrations to the metal to be cast, On the opposite side of the wall surface in contact with the cooling water box and over the entire length of the wall surface in contact with the cooling water box, slits are provided above and below the level corresponding to the meniscus during metal casting, and a vibration connecting plate is provided in the form of a flange at the level corresponding to the meniscus during metal casting.5- 50KH,
l.

A high-frequency vibrator that imparts vibration is disposed at the side end of the mold wall surface.

When casting molten metal, the initial solidification region, including the meniscus, has the highest frictional resistance between the mold and the slab, and the inventors' research has shown that the problem of seizure is more frequent here. The results have become clear.

Applying high-frequency vibration to this part will effectively reduce frictional force and prevent seizure. It is necessary to separate the vibration as much as possible from the meniscus, or to make the mold of this meniscus part so that it can easily vibrate, and also to connect the vibration connecting rod (plate) directly to this part. It is valid.

Fortunately, when the mold structure is as shown in Figure 1, the copper plate 4 on the long side has copper plate end faces exposed at both ends, to which the vibration connecting rod (plate) can be connected. It turns out that it can be done.

In addition, installing the vibrating connection plate at the side end is a more effective method since it does not cause any inconvenience to the molten metal casting operation compared to the case where the vibration connection plate is installed at the upper part of the mold.

Further, in the mold for continuous casting of metal according to the present invention, the frequency of vibration applied to the moving parts of the mold is limited to a range of 5 to 50 KH2 for the following reason.

In the slightly low frequency range of less than 5 KH2, audible noise is generated and it cannot be used in the working environment.In the frequency range of more than 50KH2, the mold acts as mechanical vibration.
It is not possible to reduce the friction between the cast metal and the cast metal.

The present invention will be explained in detail below with reference to the drawings.

The continuous casting mold of the present invention consists of wide mold surfaces 1, 1' and narrow mold surfaces 2, 2'.

Each mold has a cooling water box 3 and a mold copper plate 4.

The mold copper plate 4 is provided with slabs (8, 8') extending horizontally throughout the mold above and below the meniscus position M at the time of casting.

(See Figure 3) 7 indicates the mold operating surface, and 9 indicates the cooling water box surface.

FIG. 4 shows another embodiment of FIG. 3.

That is, the thickness of the copper plate between the molds 8 and 8' can be made thinner than that shown in FIG. 3, and the amount of vibration can be increased.

The working specifications using the mold of the present invention are shown below.

A lateral vibrator (
6KW) were installed and used, one on each side.

The area ratio of the cast slab to be cleaned was improved to 15 units, and the area rate of the edge area to be cleaned was improved to 19 units.

Furthermore, by reducing the number of vibrators at the top of the mold, the work of adding powder has become easier.

Additionally, the time required for rolling and head-setting at the end of casting has been shortened from approximately 5 minutes to 3 minutes.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the outline of a continuous casting mold with both ends open.
Fig. 2 is a perspective view showing the main parts of the present invention, Fig. 3 is Fig. 2A
-λ sectional view, and FIG. 4 shows another embodiment of FIG. 3, respectively. 1, 1'--Mold wide surface, 2. z...mold narrow side, total
・Cooling water box, 4...Copper plate, 5...Vibration connection plate, 6.
... High frequency vibrator, 7... Copper plate operating surface, 8... Horizontal slit, 9... Copper plate back surface.

Claims (1)

[Claims] 1. In an open continuous casting mold that applies high-frequency vibration, the mold consists of a wall surface in contact with the metal to be cast and a cooling water box. A slit is cut above and below the same level as the meniscus during metal casting, and a vibrating connecting plate is provided in the form of a flange at the same level as the meniscus during metal casting.
A mold for continuous casting of metal, characterized in that a high frequency vibrator for imparting KH2 vibration is disposed at a side end of the mold wall surface.