JPS6035218B2 - Continuous casting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for continuously casting thin coin coins of wide medium size by pouring molten metal onto an endlessly running metal belt and cooling and solidifying the molten metal on the belt. The present invention relates to a method for reducing belt deformation by improving the belt driving and belt tension loading methods described above, and for preventing defects caused by high-temperature deformation of coin coins by quickly separating the molten metal from the belt after solidification.

In the conventional method of cooling and solidifying the molten metal by flowing it onto the surface of a running belt, the molten metal 4 flowing from the outlet 2 of the tundish is passed through the lower cooling device 5 as shown in Fig. 1.
The skin roll 1 is generated from the water-cooled belt 11 through the water-cooled belt 11, and the skin roll 1 is located at the center of the belt 11.
It was further cooled and solidified from the outside by Oa.

In this case, the belt 11 is moved by driving the rotating drum 3 on the pouring side, and the belt 11 is tensioned by moving the rotating drum 3 or 6 on either the front or rear side to the left or right. It had a tendency to loosen.

Moreover, the following defects are likely to occur in the coins obtained by such a casting method. {1} The tension of the belt is not sufficient to prevent local expansion of the belt due to heat from the molten metal, and stress acts on the semi-molten coin coin 7, causing defects.

(2) After passing through the skin roll 10a, the coin coins 9 are placed on the belt 11 in a high temperature state, so that they are susceptible to the force caused by the vibration of the belt and are susceptible to defects. In addition, in the conventional method, since the skin roll 10a is located in the center, a pair of presser rolls 10a and 10a are placed under the belt.
b had to be installed separately.

The inventor of the present invention has developed the present invention as a result of studies on a method of preventing belt deformation and obtaining a healthier balance in order to address such problems.

The present invention will be explained in detail below using the embodiment shown in FIG.

The molten metal transferred to the evening dish 1 by a metal pump or the like is transferred to a steel belt 11 that is endlessly supported by a rotating drum 3 and a driven rotating drum 6.
Western hot water is discharged from the outlet 2 onto the end of the upper horizontal spreading section on the rotating drum 3 side.

The belt 11 is highly tensioned by a tension roll 13 provided at its lower horizontal rotating portion. The twill molten metal 4 poured onto the belt 11 is cooled through the belt 11 by a cooling device 5 installed under the belt and solidified to form a solid phase 7. The rotating drum 6 is positioned at a position where the solid phase from the belt surface reaches 80% of the total and the surface is solidified, and the skin roll 12, which is internally or externally water-cooled, is placed on top of the rotating drum 6.

The surface of the molten metal is solidified by the skin roll 12, and then rolled slightly between the skin roll 12 and the rotating drum 6 to produce an ingot 9 of a desired thickness. Immediately after the coin coin passes through the skin roll 12, it runs on a roller table 14, etc., and is forcibly cooled by cooling means 15, such as by spraying water or air. The distance between the rotating drums 3 and 6 (mold length) is appropriately selected depending on the type of casting metal and the thickness of the plate.
The length of the belt is adjusted by the tension roll 13 by horizontal movement of the belt.

In order to hold the water inside the port bath on the belt 11, metal blocks tightly connected with wire ropes should be fixed along the belt, or preferably, they should be moved in accordance with the running speed of the belt. Just do it.

In the above-mentioned method of the present invention, the coin coins that have passed through the skin roll and have been solidified are immediately separated from the belt, so there is no risk that the high-temperature mirror coins will be subjected to forces such as vibrations from the belt, and therefore, there will be defects caused by this. A healthy mirror mass without the occurrence of is obtained.

If forced cooling is applied at this time, it is possible to more effectively prevent the occurrence of defects due to high temperature deformation of the coin coin. In addition, since the rotating drum on the mirror block exit side is driven to rotate, tension can be applied to the side of the belt that receives the molten metal, thereby reducing the deformation of the belt and causing the belt to become molten. It is possible to eliminate the stress caused by the coin coins and provide a healthy coin coin.

Furthermore, since the skin roll is installed on the above-mentioned rotationally driven rotating drum, it is not only possible to omit the pressing roll paired with the skin roll, but also to drive the belt by making the skin roll and rotating drum a pair and movable left and right. In addition, the problem of tension load can be solved at the same time, and in combination with a tension roll applied to the belt, the belt length of the part that receives molten metal and is cooled and solidified can be changed as appropriate for continuous casting, which has great benefits. .

Example 3 80 qo of lead was melted onto a steel belt 11 running at 10 m/min while being controlled so as to maintain the shape of a 5-sided, 40-meter-thick pillow.

The mold length, that is, the interval between the rotating drums is 0.8 m, and the rotating drum 6
The amount of belt cooling from the bottom of the belt was adjusted so that the solid phase thickness from the belt side was 4 ribs at the position. The surface portion in a molten state was cooled and solidified by a skin roll 12, and further rolled slightly between it and a rotating drum 6. The thickness of the produced coin lump was 4.8 mm. After leaving the belt, the coin coins were placed on a roller table 14 and immediately cooled with water to a temperature of 100 oo or less.

As shown in the table below, the coin coins obtained in this manner had fewer cracks and other defects than those produced by the conventional method, had excellent surface gloss, and had extremely little variation in plate thickness. In the above embodiment, the case of lead is shown, but the present invention can be similarly applied to other metals or alloys such as aluminum and steel.

[Brief explanation of the drawing]

FIG. 1 shows a diagram of a conventional method, and FIG. 2 shows a diagram of a device according to the present invention. 3, 6...Rotating drum, 11...Belt, 12""" skin roll. Fig. l Fig. 2

Claims (1)

[Claims] 1. Molten metal is poured onto an endlessly running metal belt, and the molten metal is almost uniformly distributed between a skin roll that is installed on the metal belt and rotates at the same speed as the belt, and a presser roll that is installed on the underside of the belt. In the method of cooling and solidifying an ingot of a certain thickness, a rotary drum on the outlet side of the ingot on which the belt is hung is driven to rotate, and this also serves as the presser roll, and the above-mentioned ingot is placed on this rotating drum. A continuous casting method characterized by installing a skin roll and bringing it into contact with the surface of the molten metal to form a solid phase and equalize the plate thickness, and after solidification, the ingot is quickly released from the belt.