DE2943015A1 - SUBMERSIBLE TUBE FOR CONTINUOUS METAL CASTING - Google Patents

Description

Sponsors + applications Dipl.-ing. Curt Wallach Dipl.-Ing. Öünther Koch Dipl.-Phys. Dr Tino Haibach Dipl.-Ing. Rainer Feldkamp

D-8000 Munich 2 ■ Kaufingerstraße 8 ■ Telephone (0 89) 24 02 75 ■ Telex 5 29 513 wakai d

Date: October 24, 1979

Our reference: 16 759 - K / Ap

Applicant: TUBOS REUNIDOS, S.A.

B ^ Sagarribay, s / n.
AMURRIO (Alava)
Spain

Title: Immersion tube for continuous

Metal casting

030023/0600

The invention relates to a dip tube for continuous metal casting, which is attached to the outflow channel of a casting distributor can be connected in order to continuously transfer the melt, in particular the cast steel melt, to a mold. According to the invention, the holder carrying the immersion tube is provided with a number of reinforcing ribs, in order to be able to remove the support of the immersion tube more easily from the distributor after the casting is complete.

According to the essential feature of the invention is in the dip tube laterally an opening arranged in such a way that various metal rods or metal bars through this opening are inserted, whereby an alloy of the melt can be accomplished through these alloy inserts without that metallurgical problems arise here.

The dip tubes for continuous casting cause the liquid metal exiting the manifold to follow the melt already in the mold or mold arrives without causing bubbles to form which could lead to voids in the castings. For this reason, the pipe end is in the melt of the mold immersed, which prevents boiling and excludes the formation of pores in the castings in permanent casting is.

The previously known dip tubes were made of refractory material in a compact form. The fireproof Material has to be renewed after each casting period, which requires considerable maintenance and expense brings high costs with it, since the length of such a dip tube is not inconsiderable.

030023/0600

Because of this considerable length, the handling of the dip tube when connecting to the manifold was also critical. The immersion tube could be damaged when bumped, as the refractory material is very brittle.

In DE-OS 29 14 054 a holder is such Dip tube described, which ensures high strength and cheaper replacement of the dip tube because the immersion tube with a clamp fastening that surrounds the entire length and only leaves the lower end free with the lower part immersed in the melt of the casting mold. The main advantage of this clamp bracket consists in that the inner wall is lined with refractory material to avoid undesirably high temperatures is, and that the lower end is provided as a free length with a clamp.

Furthermore, this known clamp bracket is provided with items that facilitate connection to the distributor.

After the pouring period is complete, the pipe must usually be removed from the manifold and this requires one high expenditure of force, which can damage the lining material or the clamp bracket.

To avoid these disadvantages, according to the invention, the shell structure is provided with reinforcing ribs that are capable of are to absorb impact forces in such a way that the clamp bracket as a unit cannot be damaged. Also make it easier the reinforcement ribs a more comfortable handling, as they give the structure great strength.

03 0 0 23/0600

The essence of the present invention is that the dip tube is provided with side openings that provide access to the liquid melt inside the dip tube enable. The side openings are through both the bracket and the refractory material the lining of the pipe and through the openings metal rods or bars can be inserted into the liquid Introduce melt, causing the alloy rods to melt to produce a desired steel alloy the amount of alloy being determined by the advance of the alloy rod.

Because an ingot with an alloy metal is introduced into the liquid melt, this ingot or the rod, as soon as it comes into contact with the melt, also melts and it can be achieve good mixing. In order to be able to carry out spraying operations or The side insert opening or the side openings with inner channels or recesses is to avoid bubbling processes provided, which ensure a favorable transition from the solid phase to the molten phase. to For this purpose, a tangential recess is provided above the insert opening on the immersion tube, which the concentration and prevents the accumulation of melt splatter at this point.

In addition, according to the invention, the introduction opening is in the underlying pipe section in a channel-shaped widening continued, i.e. the strength of the refractory lining is reduced by one below the opening to enable faster drainage of the alloyed melt and to avoid blockages.

03: 323/0600

An exemplary embodiment of the invention is described below with reference to the drawing. In the drawing demonstrate:

1 shows a partially broken away side view of the dip tube designed according to the invention;

FIG. 2 is an axial view of that shown in FIG Immersion tube.

The immersion tube holder consists of two metal shell halves 1 and 3, which are connected by hinges and can be locked in the closed position. This will make the Replacing the refractory jacket after the casting has been completed is easier. To make the immersion tube ready for use again, only the refractory lining of the two shell halves needs to be replaced and the two shells must be folded together will.

The refractory lining of the shell 1 does not extend Over the entire length and with a clamp 2, the lower part of the refractory pipe, which remains free and into the Melt of the mold is immersed, is held. In this way, a continuous immersion tube is formed, and the melt, which enters the dip tube from above from the distributor, does not come into contact with the ambient air at any point, and thereby the occurrence of Prevents bubbles in the melt and the appearance of pores in the casting.

The shell halves 1, 3 are fitted with support wedges 4 for fastening and connection at the distributor. The shell half 1

03 :: 23/0600

has one or more reinforcing ribs 5 to absorb the shocks occurring when removing from the manifold when the casting is finished. As is generally known, adhesive surfaces are formed at the connection point during casting and, due to these reinforcing ribs 5, the structure of the clamp holder is not damaged in any way during detachment.

Metal rods or metal bars can be introduced into the melt within the immersion tube via one or more lateral openings 6. Each opening consists of a funnel-like pipe section 7. The corresponding alloy metal is introduced through this opening. The introduction must take place at a predetermined speed , which must be in the correct proportion to the speed of the flowing melt or in proportion to the melting of the alloy constituent. Since shock waves can set during the introduction of the alloy rod or of the ingot over the funnel-shaped opening 7 and when meeting with the liquid melt inside the dip pipe which could cause splashes and deformations of the liquid melt, is according to the invention at the inner end of the insertion tube portion a recess 8 is arranged, while at the bottom the lining of refractory material has an outlet channel 9, whereby the contact surface is enlarged and the mixing of the alloy components is improved.

0 3 0 0 2 3 / Q 6 0 0

Claims (2)

Claims 1. Immersion tube for continuous metal casting, which directs the melt from a distributor into a mold, characterized in that it has at least one lateral opening (6) is provided through which a metal bar or a metal rod is inserted into the interior of the dip tube can be in such a way that the ingot or the rod hits the melt within the immersion tube, melts and mixes with the melt, whereby an alloy is obtained. 2. Immersion tube according to claim 1,
characterized in that the wall thickness of the refractory lining material of the metal shells (1 and J>) forming the holder of the immersion tube is reduced downwards by a channel (9), and that a recess (8) is provided above the insertion opening (6), which is tangential to the periphery of the refractory material. J>. Immersion tube according to claims 1 and 2, characterized in that the metallic support housing (1, J>) is provided with at least one reinforcing rib (5) to facilitate handling and to loosen the support housing more easily after the casting has been completed can. 030023/0600 ORIGINAL INSPECTED