JPH07204819A - Method for pouring molten metal in casting equipment for tube - Google Patents

Abstract

PURPOSE:To make the completion of the molten metal pouring and the slag removal into a triangle ladle within a prescribed casting pitch by linking to the timing of drawing-out of a casting tube from a casting machine and starting a stationary ladle for supplying the molten metal into the next triangle ladle. CONSTITUTION:After completing the casting of the molten metal into a rotary metallic mold, the metallic mold is further rotated and the molten metal is solidified. Then, the tube is taken out from the metallic mold with a drawing-out device and carried out. Thereafter, the coating is applied into the metallic mold to prepare this mold to the following casting and a casting carriage is again shifted and a trough is inserted in the metallic mold to constitute the casting pitch. On the other hand, a worker, executes the cleaning work by turning over the trough having come out from the metallic mold after completing the casting around the axis in the axial direction and further, executes the cleaning work of a chute. Further, at the timing A when the drawing-out device surely clamps the tube, the casting machine outputs a starting signal for automatically starting the stationary ladle. Then, the pouring of the molten metal from the stationary ladle to the triangle ladle is automatically executed regardless of progressing degree of the cleaning works of the trough and the chute.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring method for pipe casting equipment.

[0002]

2. Description of the Related Art In a small-diameter pipe casting line, a plurality of casting machines are provided, the molten metal is put in a hot water ladle, and is distributed to a stationary ladle of each casting machine. The stationary ladle is supplied with the molten metal for a plurality of castings from the hot water ladle. In each casting machine, the molten metal for each casting is supplied from the stationary ladle to the triangular ladle, and the molten metal is supplied from the triangular ladle to the casting machine every time. The molten metal from the triangular ladle is poured into the mold of the casting machine through the chute and trough.

In such a small-diameter pipe casting line, the number of workers on the trough side is usually one, and this worker is within the time from one casting to the next casting, that is, casting. Within the pitch time, care for troughs and chutes, pouring from the stationary ladle to the triangular ladle by operating the start button of the regular ladle, and descaling of the molten metal supplied in the triangular ladle, You have to do it one by one.

[0004]

However, if it takes longer than usual to care for troughs and chutes, pouring from the stationary ladle to the triangular ladle and its descaling are completed within the normal casting pitch. Will not do. As a result, there is a problem in that the casting pitch becomes longer due to this and the productivity is reduced.

Therefore, the present invention solves such a problem so that pouring and removal of dust in a triangular ladle can be completed within a predetermined casting pitch even if it takes time to care for a trough and a chute. The purpose is to do.

[0006]

In order to achieve the above-mentioned object, the present invention is directed to the above-mentioned triangular ladle from a stationary ladle which is a molten metal for each casting from a triangular ladle in a pipe casting facility to a casting machine. In supplying the molten metal to the triangular ladle, the stationary ladle is activated in synchronization with the timing of drawing the casting pipe from the casting machine in the previous casting process.

[0007]

[Operation] By doing so, the stationary ladle can be automatically started in synchronization with the movement of the casting machine, so that pouring into the triangular ladle is completed regardless of the progress of the maintenance of the trough or chute. To do. For this reason, it becomes possible to complete the dedusting work within a predetermined casting pitch.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 2 shows one of a plurality of casting machines installed in a casting line for small diameter pipes. Here, 11 is a hot water ladle, which can receive the molten metal from the cupola and supply this molten metal to the stationary ladle 12 on the side of each casting machine. Stationary ladle 12
Varies depending on the type of pipe to be cast, but is usually about 4 to
It is configured so that the molten metal corresponding to six castings can enter. The stationary ladle 12 supplies the molten metal to the triangular ladle 13 for each casting by performing a tilting operation. And triangular ladle 13
As a result of the tilting, the molten metal in an amount proportional to the tilting angle of the triangular ladle is supplied through the chute 14 and the trough 15 into the rotary mold 17 of the casting carriage 16 that constitutes the casting machine.

The casting carriage 16 is movable along the length of the trough 15 so that the trough 15 is inserted into the rotary mold 17. Then, when the trough 15 is inserted all the way into the mold 17, the molten metal starts to be fed by tilting the triangular ladle 13, and then the carriage moves in a direction away from the triangular ladle 13 Molten metal is cast over the entire length of 17.

The movement of the casting machine at this time is shown in FIG. When the casting of the molten metal into the rotary die 17 is completed, the die 17 continues to rotate to cool and solidify the molten metal. As a result, an iron pipe is molded in the mold 17. Then, the pulling device 18 clamps the inner surface of the end opening of the pipe on the side opposite to the insertion side of the trough 15, and then pulls this pipe out of the mold 17 and carries it out.

When the pipe drawing is completed, the mold 17 is coated in preparation for the next casting, and the casting carriage is again used.
The 16 moves and the trough 15 is inserted into the mold 17. This constitutes the casting pitch. In the case of the 2-stroke type, the casting work is further repeated.

On the other hand, when the casting is completed by the movement of the casting carriage 16 and the trough 15 comes out of the mold 17, the worker reverses the trough 15 around the longitudinal axis, Perform maintenance such as dropping and discharging the residue. Shoot again
Also do 14 maintenance.

The casting machine automatically starts the stationary ladle 12 at the time when it is confirmed that the pipe is reliably clamped by the drawing device 18 and the normal drawing is performed, that is, at the time A in FIG. A start signal is issued to cause it. Then, regardless of the degree of maintenance of the trough or chute, the stationary ladle 12 to the triangular ladle 13 will be automatically operated in an unattended state.
Is poured.

Therefore, the operator only has to finish the care before the pouring is completed, as compared with the case where the stationary ladle 12 is manually operated after the care is finished as shown by the broken line in FIG. Even if it takes some time for the maintenance, it is possible to complete the work up to descaling within a predetermined casting pitch. Therefore, the pipe can be cast without reducing the productivity.

Particularly when casting a small diameter pipe having a diameter of about 75 mm to 100 mm, and even when the casting pitch is short, such as when performing dry one-stroke casting, the work is completed within the casting pitch. It becomes possible.

When the stationary ladle 12 is automatically tilted, if the hot water ladle 11 is located at a position corresponding to the stationary ladle 12, the stationary ladle 12 will rise due to this tilt. The stationary ladle 12 may collide with the hot water ladle 11. Therefore, as a measure for improving safety, the tilting operation of the stationary ladle 12 is interlocked at that time.

[0017]

As described above, according to the present invention, since the stationary ladle can be automatically started in association with the movement of the casting machine, the triangulation can be performed regardless of the progress of the maintenance of the trough or chute. It is possible to complete the pouring of water into the pan, which makes it possible to complete the descaling work within the prescribed casting pitch, and even if it takes some time to care for the troughs and chutes, productivity is improved. The pipe can be cast without dropping.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a casting method according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of casting equipment for carrying out the casting method shown in FIG.

[Explanation of symbols]

 12 Stationary ladle 13 Triangular ladle 16 Casting cart 17 Rotating mold

Claims (1)

[Claims] 1. When supplying molten metal for each casting from a triangular ladle to a casting machine in a pipe casting facility to the triangular ladle from a stationary ladle, the molten metal from the casting machine in the previous casting process is used. A pouring method in a casting facility for pipes, characterized in that a stationary ladle is activated in order to supply molten metal to the next triangular ladle in synchronization with the timing of drawing the casting pipe.