JPH08117977A - Method for plugging bottom pouring ladle - Google Patents

Abstract

PURPOSE: To prevent the leakage of molten metal from a plugging part and to improve the productivity by plugging with a stopper while remaining a little quantity of molten metal in a ladle after flowing down the molten metal. CONSTITUTION: The bottom pouring ladle is constituted of a ladle body 1, pouring nozzle 2 and the stopper 3 for plugging the nozzle. The stopper 3 is vertically moved with a hydraulic cylinder, etc. At first, the molten metal having a little more quantity than the necessary molten metal quantity to a mold 5 flask is supplemented into the ladle 1 from a tilting type large ladle 4 under condition of pushing the stopper 3 to the pouring nozzle 2. Successively, the stopper 3 is ascended, and the pouring nozzle 2 is opened to start the pouring of the molten metal into the mold 5. After completing the pouring of the molten metal into the mold 5, the stopper 3 is descended and a little quantity of the molten metal 6 is remained in the ladle body 1 to stop the flow-out of the molten metal. By this method, even if the depth of the remained molten metal in the ladle is varied, the plugging effect can be held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper method for a bottom pouring ladle.

[0002]

2. Description of the Related Art A hole at the bottom of a ladle is stoppered by a stopper,
The bottom pouring ladle that opens the stopper and flows the molten metal in the ladle toward the mold has the advantage that inclusions floating on the surface of the molten metal in the ladle are less likely to enter the mold, and are used in the casting field. ing.

The bottom pouring ladle generally takes the form of a large ladle that holds molten metal that can be poured into a mold for several tens of frames, but if hot water leaks from the stopper of the bottom pouring ladle, it will be damaged. Is big. Further, since excessive dynamic pressure is applied during pouring, when casting in a sand mold, defects such as rough skin and sand may occur.

If a molten metal is supplied to the bottom pouring ladle from another large ladle, the molten metal will be supplied to the bottom pouring ladle from the stopper if the molten metal leaks from the stopper. However, the amount of molten metal that leaks is small and it is economical. In addition, since the amount of molten metal in the ladle is small, the dynamic pressure is small, and defects such as the rough skin and sand that are caused by the large ladle are reduced.

[0005]

However, since the bottom pouring ladle is emptied for each one-frame pouring, if the stopper stopper is delayed in timing, the inclusions and the residue that have floated on the surface of the molten metal are left behind. There is a problem that the hot water adheres to the stopper of the bottom pouring ladle and is not solidified and crushed, which easily causes hot water leakage and lowers productivity. The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to prevent hot water from leaking from a stopper portion in a bottom pouring ladle and improve productivity.

[0006]

In order to solve the above-mentioned problems, the stoppering method of the bottom pouring ladle of the present invention is to stop the hole at the bottom of the ladle with a stopper and open the stopper to remove the molten metal in the ladle. In a bottom pouring ladle that is made to flow down toward a mold, after the molten metal is made to flow down to the mold, a slight amount of the molten metal is left in the ladle and the stopper is used.

[0007]

When the stopper is used to stop the molten metal slightly, the inclusions and the residual molten metal are not solidified at the stopper, so that the stopper effect is great. Further, even if the depth of the remaining hot water in the bottom pouring ladle changes, the stopper effect is maintained, and there is no problem even if the pressing timing of the stopper varies.

[0008]

EXAMPLE An example of a stoppering method for a bottom pouring ladle according to the present invention will be described below. FIG. 1 shows a bottom pouring ladle. The bottom pouring ladle comprises a ladle body 1, a pouring nozzle 2 and a stopper 3 for stopping the pouring nozzle 2. Stopper 3
Can be moved up and down by means (not shown) such as a hydraulic cylinder. First, while the stopper 3 is being pressed against the pouring nozzle 2, the tilting type large ladle 4 is used to form the ladle body 1
Then, the molten metal is replenished so that the amount of the molten metal for one frame of the mold is slightly exceeded. Next, the stopper 3 is raised, the pouring nozzle 2 is opened, and pouring into the mold 5 is started. After the pouring into the mold 5 is completed, the stopper 3 is lowered to slightly leave the molten metal 6 in the ladle body 1 to stop the molten metal from flowing out.

For comparison with the method of the above-mentioned embodiment, the inside of the bottom pouring ladle is emptied after pouring, and after 3 to 6 seconds, the stopper is pressed against the stopper 7 when pouring 100 times The number of hot water leaks was compared. Table 1 shows the results.

(Table 1) Number of times of leakage of molten metal during 100 times of pouring Classification Method of preventing leakage of molten metal Number of times of leakage of molten metal (in 100 times) Example Leaving molten metal after pouring 0 times Comparative example 3 to 6 seconds after leaving no molten metal Pressing 19 times

As shown in Table 1, in the embodiment in which the molten metal was slightly left in the bottom pouring ladle after pouring the molten metal into the mold, the stopper portion 7 was used.
There is no leak of water. Therefore, continuous casting is possible and productivity is improved. On the other hand, as shown in the comparative example in Table 1, the one in which the pouring nozzle is pressed by the stopper after 3 to 6 seconds without leaving the molten metal causes the molten metal leakage 19 times out of 100 times, which is one of the factors that hinder the productivity. .

[0012]

As described above, according to the stoppering method of the bottom pouring ladle of the present invention, since the molten metal is allowed to flow into the mold and then the molten metal is slightly left in the ladle, the stopper is inserted. Since the residual hot water has not solidified at the fitting part, it has a great effect of stoppering, and
Even if the depth of the remaining hot water in the ladle changes, the stopper effect is maintained,
It does not matter if the stopper pressing timing varies. Therefore, the leakage of hot water from the stopper in the bottom pouring ladle is prevented, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a stopper method for a bottom pouring ladle according to an embodiment of the present invention.

[Explanation of symbols] 1: Ladle body, 2: Pouring nozzle, 3: Stopper, 4: Tilt-type large ladle, 5: Mold,
6: molten metal, 7: stopper part.

Claims (1)

[Claims] 1. The stopper at the bottom of the ladle is stoppered,
In a bottom pouring ladle in which the stopper is opened to allow the molten metal in the ladle to flow down toward the mold, the molten metal is allowed to flow down into the mold, and then the molten metal is slightly left in the ladle and stoppered by the stopper. How to stop the bottom pouring ladle.