DE4127333C2 - Continuous casting mold - Google Patents

Description

The invention relates to a continuous steel casting mold, the Molded walls with several extend from top to bottom the cooling connected to a cooling water circuit holes are provided, the flow cross section through Displacement rods is reduced.

GB-C-1 051 291 is a billet continuous casting mold known, the mold walls on the pouring side an insert have a metal-graphite mixture. The mold walls the mold are provided with cooling holes that go over their entire displacement rods inside. Cool bores and displacement rods show in the area of use smaller diameter than in the lower part of the mold walls. It follows from this due to the smaller cooling surfaces in the upper one Area has a lower cooling capacity than in the lower area. The diameter gradation of bores and displacement rods is expensive.

The mold walls of continuous casting molds are made by mechanical Wear and tear due to uneven heat and heat dissipation stressed due to thermal stress and voltage delay. It should be noted that the service life of the molds an essential factor in profitability calculation of continuous casting plants. This is especially true Dimensions for continuous casting plants for casting thin strand cross cut.

The object of the invention is a steel strip casting mold to create an extended pouring area, in particular the thermal stress on the mold walls is reduced and better dimensional stability and crack resistance  is enough. According to another subtask, Ver improvement of the cooling conditions the surface quality of the ge cast steel strip can be increased.

The object is achieved according to the invention in that that with a steel strip casting mold, the wide side walls form an extended pouring area, the displacement rods at most over the length of the pouring area and min extend over a hot zone of the same.

In this way, the cooling water flows in the area of the highest Temperature load at maximum speed. This will heat dissipation in the area of the highest temperature load improved and the wall temperature reduced. The associated reduction in temperature differences between the height areas of the mold leads to tension reduction and extension of the service life of the molds walls.

A major advantage is that the displacer would go down from the level adjustment zone Extend 100-250 mm.

A particularly good cooling effect is achieved in that the displacement rods in the cooling holes are opposed are eccentrically shifted to the mold wall surface.

In addition, the invention proposes that the cross section Q _{max of} the displacement rods is graduated to the ends.

In the drawing are exemplary embodiments with features and Advantages of the invention shown. Show it  

Fig. 1 shows a cross section through a Stahlbandgießkokille with cooling holes in the broadside walls,

Fig. 2 shows the inside view of a broad side wall with narrow side walls arranged in front of it

Fig. 3 shows an enlarged detail according to the outline III in FIG. 1.

Fig. 4 shows an alternative embodiment of a displacement rod, and

Fig. 5 in the sectional plane in Fig. 4 each have a concentric and eccentric arrangement of displacement rods in cooling bores.

Of a steel strip casting mold, two broad side walls 2 , 3 provided with cooling bores 1 and two narrow side walls 4 , 5 arranged between them are shown in FIGS . 1 and 2. The broad side walls 2 , 3 form an extended pouring area 6 for a pouring tube 7 . A line indicates the nominal fill level 8 of the mold. A hot zone 9 of the mold extends from the fill level 8 downwards.

The broad side walls 2 , 3 are provided over their width with a plurality of the cooling bores 1 connected to a cooling water circuit 10 . In order to increase the cooling effect in the area of the hot zone 9 which is subject to high temperatures due to the molten steel and the thin first strand shell, displacement rods 11 , 11 'are arranged in the cooling bores 1 . The displacement rods 11 , 11 'extend from the nominal fill level 8 of the mold downwards in a length 1 of 100-250 mm.

The displacer rod 11 shown in FIG. 3 has its maximum cross section Q _max in the area of the hot zone 9 , the end cross sections being reduced. In contrast, the displacement rod 11 'in Fig. 4 has a uniform diameter. The displacement rods are attached above the coolant outlet openings 12 by screws 13 . The position of the displacement rods 11 , 11 'is defined by pins 14 on the underside.

From Fig. 5 is 11 to see 'within the cooling holes 1 a concentric and an eccentric arrangement of the displacement rods. In the eccentric arrangement, the cooling water supply to the mold interior is concentrated.

Claims (4)

1. Steel continuous casting mold whose mold walls are provided with a plurality of cooling bores extending from top to bottom and connected to a cooling water circuit, the flow cross section of which is reduced by displacement rods, characterized in that in the case of a steel strip casting mold, the broad sides of which walls ( 2 , 3 ) have an enlarged pouring area ( 6 ) form, the displacement rods ( 11 ) extend at most over the length of the pouring area ( 6 ) and at least over a hot zone ( 9 ) of the same. 2. Steel strip casting mold according to claim 1, characterized in that the displacement rods ( 11 ) from the fill level setting zone ( 8 ) extend downward about 100-250 mm. 3. Steel strip casting mold according to claim 1, characterized in that the displacement rods ( 11 ) in the cooling bores ( 1 ) are displaced eccentrically opposite to the mold wall surface. 4. Steel strip casting mold according to claim 1, characterized in that the cross section Q _{max of} the displacement bars ( 11 ) is reduced to the ends.