EP1317978A1 - Mould pipe for continuous casting of metals - Google Patents

Abstract

Mold tube has a tube wall (2) with an inner contour (3) in a beam-blank format with rounded transitions (6) between wall sections (9) delimiting a flange region (7) on one side and a web region (8) on the other side. The inner contour can be directly cooled by a cooling medium introduced from the outside. Cooling channels (4) are provided in the tube wall extending in the longitudinal direction. The distance from two cooling channels next to each other in the transitions is less than the distance in the remaining wall sections. <??>Preferred Features: A water guiding casing fitted to the tube wall is provided on the outer contour. The tube wall has a double T-shaped cross-section.

Description

The invention relates to a mold tube for the continuous casting of metals according to the Features in the preamble of claim 1.

It is to dissipate the heat generated during the continuous casting of metals known to install a mold tube in a water jacket. Here is for it Care that due to the inner dimensions of the water jacket on the one hand and the outer dimensions of the mold tube on the other thermally precisely defined gap is formed by the bottom Cooling water flows above, which absorbs the heat and transports it away. If a mold tube in beam blank format is used, the inner contour must also be used correspond to the outer contour of such a format.

The dissipation of heat by means of the cooling water is largely due to the water speed in the gap between the mold tube and the water jacket certainly. However, this gap increases with each recalibration Chill pipe due to wear-related wear and tear inevitably caused reduction in the wall thickness of a mold tube. The Increasing the water gap is, however, with a reduction in the water speed and consequently associated with a reduction in heat dissipation.

From GB 954 719 it is known to use molds for the continuous casting of metals To provide cooling holes, which are both in the longitudinal direction and in Extend the transverse direction of the mold tube. For mold tubes in beam blank format However, there is the problem that cooling bores cross to Longitudinal extension can only be introduced into the mold tubes with great effort can. In addition, the special geometry of the beam blank format creates extreme local heat loads in the transitions between one side Flange area and on the other hand wall sections delimiting a web area. This local heat load leads to unfavorable geometric conditions the transitions to overheating the mold tube and to a drastic one Reduction of its service life.

Based on the prior art, the invention is based on the object To provide mold tube for the continuous casting of metals, which improved Has service life and at which local overheating is avoided.

A first solution to the problem consists in the features of patent claim 1.

According to the features of claim 1, the distance of two in the Transitions between adjacent cooling channels smaller than the distance between adjacent ones Cooling channels in the remaining wall sections.

This is initially associated with the advantage that one on the outer contour Pipe mold to be adapted water guiding jacket can basically be omitted. This Significant reduction in production costs is particularly the case with one Mold tube in a beam blank format is noticeable.

The heat is dissipated via the cooling channels in the pipe wall changing heat dissipation conditions more. The number of recalibrations has no influence on the cooling capacity.

The cooling ducts can in principle be used in all wall sections on the end faces emerge from the pipe wall. In these areas it is easy to install and secure sealing of a mold tube after recalibration without any problems possible to carry out welds, which are then easy after recalibration reworked to new dimensions.

If the cooling channels are provided with a round cross section, the result is further advantage after bending a tube mold to a beam blank format, that the cross sections of many cooling channels are also oval shaped, namely in the sense that the surface areas increase towards the pouring channel, so that a higher heat dissipation can be expected.

A second solution consists in the features of claim 2 it is also possible to provide cooling channels only in the rounded transitions, while the remaining wall sections and the rounded transitions over one adapted to the outer contour of the tube wall water jacket. at In this solution, the entire pipe wall is not interspersed with cooling channels. Much more are only available in the areas where cooling holes are located Overheating would reduce the service life of the mold tube. By combining a water jacket with the rounded transitions of the Cooling channels introduced into the pipe wall can cause local overheating in the rounded transitions avoided and the service life of the mold tube increased become.

It is also possible according to the features of claim 3, one Wasserleitmantel and at the same time both in the rounded transitions and in to provide cooling holes in the remaining wall sections of the tube wall, the Distance between two adjacent cooling channels in the transitions is smaller than the distance in the other wall sections.

The cooling channels provided in the transitions can differ from the upper one Face of the pipe wall up to about the middle height range of the pipe wall extend. This is thermally strong for a more intensive heat dissipation in locally claimed wall sections worried (claim 4).

According to claim 5 it is provided that in the outer contour of the tube wall the cooling ducts and cooling medium outlets connected are provided. These can be particularly advantageous in the middle Height range to be provided on the outer contour of the tube wall (claim 6). To form a cooling channel system, the front of the Pipe walls introduced closed cooling channels and by overflow channels connected with each other.

To cool the mold tube, it is fundamentally possible to supply the cooling medium and coolant discharge to a separate cooling circuit to join. But that can be advantageous between the tube wall and the Coolant flowing through the water guiding jacket also flows through the cooling channels and for intensive heat dissipation in areas subject to higher thermal stress (Claim 7). To keep the coolant from entering the gap between the Water guiding jacket and the pipe wall in the cooling ducts can be facilitated at the The outer contour of the pipe wall and / or the water guide jacket suitable guide means be provided, the flow of the cooling medium into the cooling channels to steer.

The features according to the invention are particularly advantageous for one Mold tube with a double T-shaped cross section according to claim 8 noticeable.

The mold tube is preferably made of copper or a copper alloy.

Figur 1

den oberen Endabschnitt eines Kokillenrohrs im Beam-Blank-Format in der Perspektive;

Figur 2

das Kokillenrohr der Figur 1 in etwas verlängerter Darstellung in einer anderen Perspektive und

Figur 3

den oberen Endabschnitt eines Kokillenrohrs im Beam-Blank-Format gemäß einer weiteren Ausführungsform.

The invention is explained in more detail below on the basis of an exemplary embodiment illustrated in the drawings. Show it:

Figure 1

the top end of a mold tube in beam blank format in perspective;

Figure 2

the mold tube of Figure 1 in a somewhat extended representation in a different perspective and

Figure 3

the upper end portion of a mold tube in beam blank format according to a further embodiment.

1 in FIGS. 1 and 2 denotes a mold tube in beam blank format.

The mold tube 1 has a double-T-shaped cross section with one over the entire circumference constant thickness D of the tube wall 2.

The inner contour 3 of the mold tube 1 determines the cross section of the casting strand.

In order to dissipate the heat generated during casting, the pipe wall 2 itself Cooling channels 4 extending over the entire length L of the mold tube 1 introduced, which according to the arrow KW from bottom to top with cooling water are acted upon. That means the cooling channels 4 end in the end faces 5 of the Pipe wall 2, only one end face 5 being visible.

The cooling channels 4 are introduced into the tube wall 2 by a drilling operation, and before the mold tube 1 is bent. By bending the Then partially deform the cooling channels 4 so that they are larger toward the inner contour 3 Surface areas are formed, whereby the heat dissipation is improved.

The special inner contour 3 of the mold tube 1 has rounded transitions 6 between a flange area 7 on the one hand and a web area 8 on the other delimiting wall sections 9. The distance A from two in the transitions 6 mutually adjacent cooling channels 4 is smaller than the distance B in the rest Wall sections 9.

While in the embodiments of Figures 1 and 2, the cooling channels 4 Enforce mold tubes 1 over their entire length L, it is also conceivable that the cooling channels 4 provided in the transitions 6 from the upper end face 5 of the tube wall 2 extend to approximately the middle height range of the tube wall 2. These cooling channels 4 can be used to form a cooling circuit at their upper End faces to be connected to one another and via coolant feeds and Coolant discharge in the middle height range of the pipe wall 2 with a Cooling medium can be fed.

In addition, the mold tube 1 can be inserted into an outer contour 10 of the tube wall 2 adapted water jacket be embedded so that the mold tube 1 as a whole is surrounded by a cooling gap through which a cooling medium flows.

FIG. 3 shows a further embodiment of a in a slightly different perspective Chill tube 11 with an inner contour 12 in beam blank format, also with rounded transitions 13 between a flange portion 14 and on the other hand wall sections 16 delimiting a web area 15 Exemplary embodiments are cooling bores 4 only in the transition areas 13 available. The entire mold tube 11 is in a manner not shown in a water guiding jacket adapted to the outer contour 17 of the tube wall 18 embedded, over which both the other wall sections 16 and with Cooling holes 4 provided transition areas 13 are cooled.

REFERENCE NUMBERS

1 -

Mold pipe

2 -

Rohrwand v. 1

3 -

Inner contour of 1

4 -

cooling channels

5 -

End faces v. 2

6 -

Transitions between 7 and 8th

7 -

flange

8th -

web region

9 -

wall sections

10 -

Outer contour of 1

11 -

Mold pipe

12 -

Inner contour of 11

13 -

Transitions between 14 and 15

14 -

flange

15 -

web region

16 -

Wall section v. 18

17 -

Outer contour of 18

18 -

pipe wall

A -

distance

B -

distance

D -

Thickness v. 2

L -

Length of 1

KW -

cooling water

Claims (8)

Mold tube for the continuous casting of metals, the tube wall (2) of which has an inner contour (3) in beam blank format with rounded transitions (6) between a flange area (7) on the one hand and a wall area (9) delimiting a web area (8), whereby the inner contour (3) can be indirectly cooled by a cooling medium (KW) supplied from the outside, and wherein cooling ducts (4) extending in its longitudinal direction are provided in the tube wall (2), characterized in that the distance (A) from two in the transitions (6) adjacent cooling channels (4) is smaller than the distance (B) in the other wall sections (9). Mold tube for the continuous casting of metals, the tube wall (18) of which has an inner contour (12) in beam blank format with rounded transitions (13) between a flange area (14) on the one hand and a wall area (16) delimiting a web area (15), whereby the inner contour (12) can be indirectly cooled by a cooling medium (KW) supplied from the outside, and wherein cooling ducts (4) extending in its longitudinal direction are provided in the tube wall (18), characterized in that the cooling ducts (4) only in the rounded transitions (13) are provided and the remaining wall sections (16) and the rounded transitions (13) can be cooled via a water-conducting jacket adapted to the outer contour (17) of the tube wall (18). Mold tube according to claim 1, characterized in that a water-conducting jacket adapted to the outer contour (10) of the tube wall (2) is provided. Mold tube according to one of the claims 1 to 3, characterized in that the cooling channels (4) provided in the transitions (6, 13) extend from the upper end face (5) of the tube wall (2, 18) to approximately the middle height region of the tube wall ( 2, 18) extend. Mold tube according to one of the claims 1 to 4, characterized in that in the outer contour (10, 16) of the tube wall (2, 18) to the cooling channels (4) connected cooling medium supply and cooling medium discharges are provided. Mold tube according to claim 5, characterized in that the cooling medium inlets and cooling medium outlets are provided in the central height region of the tube wall (2, 18). Mold tube according to one of claims 2 to 6, characterized in that the cooling channels (4) are flowed through by the cooling medium (KW) flowing between the tube wall (2, 18) and the water-conducting jacket. Mold tube according to one of the claims 1 to 7, characterized in that it has a double T-shaped cross section.

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