RU1771876C - Method of bottom casting of steel - Google Patents

Abstract

Usage: in metallurgy in the production of steel, in particular in siphon casting, to improve the quality of metal, increase labor safety and reduce metal loss. SUBSTANCE: method involves installing a slide gate on a pouring ladle, filling the channels of the fixed slide of the shutter and the bucket with bulk material, filling the ladle with metal, centering the ladle relative to the center first bush and opening the shutter, while the first opening of the slide gate is carried out simultaneously with the removal of the loose of material under the technological mold for underfilling, and after the start of the expiration of metal / - la after 3-8 s, the slide gate is closed, the bucket is centered under the center of the first bush and about kryvayut gate valve. 1 s.p. f-ly. cl

Description

The invention relates to metallurgy and can be used in the production of steel, in particular in its siphon casting.

The closest technical solution to the proposed one is the known method of siphon casting of steel, which includes installing a slide gate on a casting ladle, filling casting channels with bulk material, filling the ladle with metal, hanging the shutter control cylinder on the ladle, centering the bucket relative to the center, and opening the shutter. of the method is that the first opening of the slide gate before the outflow of metal occurs, the loose material is spilled ala from

filling channels. To prevent backfill material from entering the center and ingots, the center cover is made of heavy paper.

However, this protection is not reliable and does not in all cases prevent the bulk material of the backfill from entering the center.

In addition, in order to completely remove the bulk material from the casting channel, a slide gate must be fully opened, while from the point of view of producing high-quality metal, casting is necessary with a small stream, gradually increasing it from zero to 1/2 - 1/3 of the full opening.

The purpose of the invention is to improve the quality of metal, increase labor safety, and reduce metal loss.

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The goal is achieved in that in the known method for siphoning steel into molds through a slide gate, it is new that the operations of cleaning the casting channels from the backfill material and the filling of the molds are separate. For this purpose, before the start of casting, the slide gate is completely opened over the technological mold for underfilling. After pouring loose material, the shutter is closed, the bucket is centered over the center and the casting begins. Since the first opening of the slide gate is made on the technological mold, it does not affect the quality of the metal and can be performed as necessary for the best removal of the backfill material. On the other hand, since the slide gate is opened during casting while the casting channel is washed, the degree of shutter opening can be selected based on technological requirements.

To reduce the possibility of metal freezing in the pouring channel after pouring loose material over the technological mold, the shutter was not closed immediately, but after a part of the metal had expired for 3-8 seconds. for heating the casting channel. In this case, the necessary heating time was established experimentally - 3 s for liquid steels of type 45. 40 X, 8 s for steels of type 38 X MJA, X18H9T, which are prone to tightening the casting channel.

The first opening of the slide gate over the technological mold allows to increase labor safety during emergency operations associated with the removal of backfill material from the casting channel, as well as when burning the channel with oxygen. In the known method for this, the bucket is raised above the center to a height of about 1000 mm (working - 100 mm), providing the necessary working space. After cleaning the channel, the stream of metal strikes the edge of the funnel and splashes, which creates dangerous working conditions.

In the proposed method, all these works are carried out on a technological mold for underfilling. The proposed casting method is carried out as follows.

After installing the slide gate on the casting ladle and filling the pouring channel with bulk material, the ladle is filled with metal and the control cylinder for the slide gate is hung on it. The bucket is centered relatively

a technological mold for underfilling which is positioned so that it does not interfere with work on the job site.

Next, the pourer produces a complete

slide gate opening. After pouring the backfill and expiring the metal for 3-8 seconds into the technological mold, the slide gate is closed and the bucket is centered over the center of the first bush.

After alignment, the slide gate is opened manually manually to the required size or the automated casting control system is turned on.

5 After filling the first bush, move to the next bush and repeat the process

The proposed method for siphon casting of steel into the molds through the gate

0 gate can be implemented for any weight distribution of ingots.

The use of the method is most effective for casting alloy steel, which requires to obtain a high surface quality of the ingots, strict adherence to the optimal casting regime, especially in the initial period.

In addition, the use of the proposed method for siphon casting in a mold through a slide gate provides the following advantages compared to the existing method:

-increasing the accuracy of determining the relative position of the slab shutter plates;

-reduction of metal losses and ensuring labor safety;

-improving the surface quality of the ingots by 10-20%.

Claims (1)

1. The method of siphon casting of steel into molds from a casting ladle through a slide gate, including filling the casting channels with bulk material 5 ladle and slide gate, filling the casting ladle with melt, removing bulk material from the casting channels, casting into molds and pouring metal residues into the technological mold for 0 refill, characterized in that, in order to improve the quality of the metal, increase safety and reduce metal losses, the removal of bulk material from the casting channels is carried out before casting into the molds by fully opening the slide gate above the technological mold for refilling and then closing after spillage of bulk material and the expiration of part of the metal, 2, The method according to claim 1, characterized by interruptions in casting, closing the gate the fact that, with the aim of heating the casting shutter over the technological mold sludge and reduce the possibility of solidification-produced 3-8 s after the beginning of the expiration of metal in them during technological metal.