DE1218120B - Device for continuous casting of metal bars - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

B22d

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Deu.sO.Kl,

Number: ι zi8 rzuj ^ jy "*"" Δ '

File number: St 14581VI a / 31 c

Filing date: December 18, 1958

Opening day: June 2, 1966

In continuous casting, the melt to be cast is poured into a cooled mold without a bottom. There, heat is withdrawn from the melt, so that the solidification moves from the outside to the inside forms a strand that is slowly pulled downwards.

Continuous casting pellets are known in which the melt is poured in from above and solidified Strand is pulled down. In these molds, casting on presents certain difficulties, and it is only with great difficulty possible to produce a strand of prescribed length.

To avoid these disadvantages, it is known to use the continuous casting mold with z. B. under hydrostatic To load under pressure, liquid cast material from below and the resulting strand after deduct above. These systems set up for the so-called "rising pouring" show the additional The advantage is that their plant and operating costs are lower than those of plants where the continuous casting mold is fed from above. Both types of continuous casters, i. H. the systems fed from above and from below have the common disadvantage that the Strand as a result of the reduction in volume from the mold wall during the solidification process takes off. As a result of the resulting loss of thermal contact between the strand surface and mold wall, the cooling effect of the mold can only be partially used.

Attempts have already been made in systems that are set up for rising pouring, the room to be filled with coolant between the mold wall and the solidified, shrunk strand, but this requires a significantly increased effort, and there are also certain precautionary measures to take because the coolant acts directly on the hot strand.

The main patent application St 14404 VIa / 31c (German Auslegeschrift 1213 090) now describes a method with the help of which it is possible to create a Lead strand in direct contact with the mold wall without detachment of the strand occurs. In this process, the cast material becomes the final cross-section in the first stage widening, step-shaped, cooled mold supplied, and it is the solidification of the cast material in the individual stages, with the exception of the last stage, along at least one in the direction of the Mold axis extending strip on the mold wall prevented. This prevention of

Continuous casting device
of metal strands

Addition to registration: St 14404 VI a / 31 c ■
Interpretation document 1213 090

Applicant:

Dipl.-Phys. Karl-Heinz Steigerwald,

Wasseralfingen, Bahnhofstr. 6th

Named as inventor:

Dipl.-Phys. Karl-Heinz Steigerwald,

Wasseralfingen

for example, stiffening takes place by means of stripes Inserts made of poorly thermally conductive material ■ or through such a design of the mold walls, that they are unevenly long over the circumference.

As with this procedure, various Avoid disadvantages, in particular, the detachment of the strand from the mold wall and the formation of cracks in the strand and unfavorable crystal growth. However, the disadvantages mentioned at the beginning remain, namely the difficult casting on and the difficult production of strands prescribed Length.

These disadvantages are avoided according to the invention in that the other according to the Main patent application set up device for casting metal strands for rising cast is. So there are in the device according to the invention with the method or the Device according to the main patent application achievable advantages with the advantages of systems for rising font united. The device according to the invention requires relatively low plant and operating costs, allowed to work without casting difficulties and also strands more desired Manufacture length without the occurrence of the conventional continuous casting processes Casting defects occur. In particular, the new device has compared to the previously known systems for increasing cast also the advantage that their overall height can be kept lower for the same performance can. This results in a significant cost saving.

609 577/353

It is useful to have one at the inflow opening of the mold to interrupt the inflow of Provide a gate valve that is used for casting. This makes it possible to predetermine strands in a simple manner Pour length.

The invention is explained in more detail below with reference to the figure representing an embodiment.

In this figure, 1 is a EinußöSnung referred to, which over casting channels 2 and 3 with a from the stages 11 and 12 existing continuous casting mold is in connection. The liquid cast 5 passes through the appropriately heated channels 2, 3 and the inflow opening 8 in the mold stage 11. Da the mold 11, 12 and the pouring opening 1 form communicating tubes, the cast material rises in the Mold up to the liquid level reached in the Gußöffmmg. The forms in the mold Strand 13, which is slowly pulled upwards by means of a pull-out device 7.

Two sliders 9 and 10 are used to control the Inflow of cast material 5. With their HiMe can be achieved that the strand 13 only up to a certain Length increases and then tears off. This tearing takes place after the opening 8 has been closed Inserting the slider 10,

So that a continuous flow of cast material 5 can be maintained, for example To the left of the pouring opening 1, arrange a mold that is exactly the same as the mold 11, 12. on in this way a reciprocal operation of the two molds is possible.

The mold stage 11 has inserts 14 and 15 made of poorly thermally conductive, heat-resistant material Mistake. The cast material 5 does not solidify along these inserts. This means that the The strand skin forming the mold wall is prevented from solidifying in two axially extending strips. This prevents the strand from becoming detached from the mold wall on the one hand, and on the other enables the liquid cast material to reach the mold stage 12.

Claims (1)

Patent claims: ίο 1. Device for continuous casting of metal strands »especially steel strands, with a widening to the final cross-section * ■ step-shaped, cooled mold, in which the solidification of the cast material in the individual stages, with the exception of the last stage, along at least one in the direction of the Mold axis running strip on the mold wall is prevented, according to patent application St 14404 VIa / 31c (German Auslegeschrift ao 1213 090), characterized in that that the mold is designed for rising cast. 2. Device according to claim 1, characterized in that that at the inflow opening of the. · ■ first 'mold stage on to interrupt the Inflow of cast material serving gate valve is provided. - Considered publications:
German patent specifications No. 726 401, 705 767,
840; Sehwarzmaier, W., "Stranggießen", 1957> pp. 105 to 107; Herrmann, "Manual of Continuous Casting", 1958, pp. 158, 160,165. 1 sheet of drawings 609 577/353 5.66 © Bundesdruckerei Berlin