EP1328364B1 - Metallurgical vessel and method for producing the same - Google Patents

Abstract

A metallurgical vessel for transporting molten metals with a metal jacket with a heat-resistant lining is disclosed. The jacket has two reinforcing rings extending in the peripheral direction and being secured to and integrated in the jacket. The vessel also has two one-part shield segments, each affixed to at least to one of two stiffening rings. The shield segments include arms that extend in both peripheral directions and are provided with a welding edge for welding to the stiffening rings. Two lifting lugs are disposed on the exterior of the vessel on opposing sides thereof and supported by the stiffening rings. A stiffening ring can be implemented as two 120° segments connected at their ends to the two shield segments which each extend over 60° along the periphery.

Description

The invention relates to a metallurgical vessel for the transport of molten Metals according to the preamble of claim 1, and a method its manufacture according to the preamble of claim 7.

A vessel for metallurgical purposes is known from DE 195 38 530 C1. It points a heat-resistant liner, made of individual tubular Shots composite metal jacket, the circumferential with Stiffening rings is provided and on the two vessel support pins on the outside arranged opposite each other and by means of one each connected to the stiffening ring Plate are supported. Depending on the size of the axial extent of the vessel, there are more ais two stiffening rings provided as an integral part of the metal shell and the The central area of the plate is at a short distance from the metal jacket and the upper one and the lower brim-like edge region of the plate is adjacent to it horizontal stiffening ring connected. The vessel support pin extends from the plate only to the outside.

An improved version is disclosed in DE 197 06 056 C1. With this further development has the first stiffening ring closer to the floor in the area of the Shield segment formed plate an upward, nose-like trained Continuation and the second stiffening ring in the Area of the shield segment a downward nose-like trained continuation on. The shield segment is welded in between the continuations, the Transition from the respective continuation into the respective stiffening ring both in the Longitudinal section as well as the top view is rounded and the latter rounded go into the corresponding rounding of the shield segment without kinks.

A disadvantage of both constructions is that the plate segment is attached to the A long connecting seam is required and the shield segment to the metal jacket Stiffening rings must be aligned in a complex manner.

The object of the invention is to provide a metallurgical vessel for the transport of molten Specify metals, which has a simple construction, so that Manufacturing costs are lower compared to the known designs.

This task is based on the respective generic term in conjunction with the characteristic Features of claims 1 and 7 solved. Advantageous further developments and a method for The manufacture of a metallurgical vessel is the subject of subclaims.

According to the teaching of the invention, the shield segment is formed in one piece and at least the upper region has arms extending in both circumferential directions, which in the End area in cross section adapted to the respective subsequent stiffening ring and are provided with a welding edge. Preferably, the upper and lower areas of the shield segment extending arms in both circumferential directions.

Instead of the long, circumferentially extending weld seam are at least only another two, usually four short transverse seams are required to connect the shield segment with the to connect stiffening rings. This design concept is for all sorts Shield segment shapes and types of connection to the metal jacket applicable.

The manufacturing costs can be reduced even further if you manufacture the The supporting structure proceeds as follows. The usually forged 360 ° stiffening ring is divided into three segments each with 120 ° extension. From two 120 ° segments of at least the upper stiffening ring and two 60 ° extensions each having shield segments, the supporting structure is formed. The third 120 ° segment the respective stiffening ring can be used for the next vessel so that when producing two vessels, a total of at least two 120 ° segments for a third container. The one when disconnecting the 360 ° stiffening ring Any cutting loss that occurs must be taken into account for the two 60 ° shield segments become. The straight extension must also be taken into account if an im Cross section of oval vessel to be produced.

Until now it was common to manufacture the shield segment as a forged part. Alternatively, after proposed a further feature of the invention, the one-piece shield segment to manufacture a thick sheet. Starting from a block casting, a thick sheet is created rolled, which, after being cut to size, can be bent warm or cold using a press becomes. The choice of hot or cold forming depends on the thickness of the sheet and the selected material. The desired contour and the hole for the trunnion are burned out and finally the final one is made by mechanical processing Final contour made.

In order to create a sufficient fine-grained structure, it must be taken into account that the degree of deformation from block casting to thick sheet is at least the degree of forging corresponds to a conventionally manufactured shield segment.

Another feature also applies to the manufacture of the stiffening rings proposed a new method of the invention. Instead of the stiffening rings too Forging, you can roll them as straight profiles and after cutting into lengths bend them into a 120 ° segment. The end areas are in relation to the welding edges machined.

Figur 1

eine Außenansicht einer erfindungsgemäß hergestellten Stahlgießpfanne,

Figur 2

eine Draufsicht von Figur 1,

Figur 3

linke Hälfte, ein Schnitt in Richtung A-A in Figur 1; rechte Hälfte, die dazugehörige Ansicht,

Figur 4

in einer Ansicht das erfindungsgemäß ausgebildete Schildsegment,

Figur 5

einen Schnitt in Richtung B-B in Figur 4,

Figur 6

einen Schnitt in Richtung C-C in Figur 4,

Figuren 7-9

Prinzipskizzen zur Erläuterung des Herstellverfahrens.

Further features, advantages and details of the invention result from the following description of an embodiment shown in a drawing.
Show it:

Figure 1

an external view of a steel ladle produced according to the invention,

Figure 2

2 shows a top view of FIG. 1,

Figure 3

left half, a section in the direction AA in Figure 1; right half, the corresponding view,

Figure 4

in a view the shield segment designed according to the invention,

Figure 5

4 shows a section in the direction BB in FIG. 4,

Figure 6

3 shows a section in the CC direction in FIG. 4,

Figures 7-9

Principle sketches to explain the manufacturing process.

FIGS. 1-3 show an external view, a top view and a section of the invention formed metallurgical vessel, here in the form of a steel ladle 1, shown. This consists of a pipe section 2-4, which is heat-resistant Lining receiving metal jacket and a bottom 5 and foot elements 6. Two circumferential stiffening rings 7, 8 are integrated in the metal jacket and a shield segment 9, 9 'arranged between them. In a bore 10 (Figure 4) of the shield segment 9, a support pin 11, 11 'is welded in each case. At the here a tilting linkage 12 is attached to the left-hand outside, around the steel ladle 1 to be able to tilt using a crane, not shown here. In this embodiment is the top edge of the vessel 13 with a lid attachment designed as a ring lid 14 connected. This ring cover 14 preferably has a frustoconical shape Cross section on. As can be seen in Figure 2, this steel ladle shown here has 1 has an oval cross section.

FIG. 3 shows two different embodiments in a partial section and in a view of the shield segment 9 shown. In this illustration, they are in the trunnion 11, 11 'hook hook loops 15, 15' can be seen. In the partial section on the left here the one-piece shield segment 9.1 has a recess 16 on the inside. In terms of area, this is larger than the inner surface 17 of the trunnion 11. In the recess an insulating layer can be placed to control the temperature in the trunnion lower. The shield segment 9.2 shown in the right view is against this continuously smooth on the inside.

The shield segment 9 designed according to the invention is shown as a detail in FIG. 4. It has an almost rectangular central part 18, with the bore 10 for receiving the respective Trunnion 11, 11 '. In the upper and lower area close to the middle part 18 to the right and left each an extending arm 19, 19 ', 20, 20'. In shape and In cross-section, the end regions of these arms correspond to the respective stiffening ring 7, 8. They are designed as welding edges to the respective shield segment 9, 9 'with the Stiffening rings 7, 8 to be able to connect cohesively.

Because of the oval cross section of the steel ladle 1, the middle part 18 is straight (Figure 5), the circumferential extent corresponding to the degree of ovality. The adjoining areas are bent to ensure a clean connection to the To ensure metal jacket or stiffening rings 7, 8.

FIGS. 7-9 show the proposed manufacturing process in the form of principle drawings shown for the stiffening rings 7, 8. For example, the manufacturing method for the lower stiffening ring 7 schematically explained. The forged 360 ° full ring is divided into three 120 ° segments I, II, III in a first step. The third 120 ° segment III is shown in dashed lines to clarify that this segment for the first vessel is not needed. Figure 8 now shows how from the two 120 ° segments I, II and two 60 ° shield segments 9, 9 'the supporting structure is formed, the upper Stiffening ring 8 would belong. It goes without saying that the top stiffening ring 8 would be manufactured and cut in the same way. To make it clear that the intermediate parts are the 60 ° sign segments are Trunnions 11, 11 'have been drawn in. When dimensioning the extension of the 60 ° shield segments 9, 9 ', the loss of cut occurring during separation must be taken into account.

In Figure 9, the variant is the production of a steel ladle 1 with an oval cross section shown. Comparable to FIG. 5, the middle part 18 is straight and the two adjacent sections bent to a 30 ° segment, so that in total one 60 ° segment results. The consideration of cutting losses also applies here.

LIST OF REFERENCE NUMBERS

1

steel ladle

2-4

Pipe shot metal jacket

5

ground

6

foot element

7, 8

stiffening ring

9, 9 '

shield segment

10

Bore shield segment

11, 11 '

supporting journal

12

tilt rod

13

vessel edge

14

ring cover

15, 15 '

hook loop

16

Recess shield segment

17

Inner surface of trunnion

18

Middle part of shield segment

19, 19 '

Arm of the shield segment

20, 20 '

Arm of the shield segment

Claims (12)

1. Metallurgical vessel (1) for transporting molten metals, with a metal casing which holds a heat-resistant lining, which casing has two bracing rings (7, 8) which run in the direction of the circumference and which are secured and integrated in the metal casing at an axial distance from one another, and on which casing two lifting lugs are positioned on the outside and opposite to each other, and are supported in each case by a shield segment (9, 9') which is joined to the bracing rings, the transition from the bracing rings to the shield segment being rounded off, and, if required, a cover top with a tapered cross-section being secured to the edge of the vessel,
   characterised in that
   the shield segment (9, 9') is made in one piece, and at least the upper area of it has arms (19, 19') which extend in both circumferential directions and the cross-sections of whose end areas are made to match in each case the adjoining bracing ring (8) and have a bevelled edge.
2. Metallurgical vessel as in Claim 1,
   characterised in that
   the upper and lower areas of the shield segment (9) have arms (19, 19', 20, 20') that extend in both circumferential directions.
3. Metallurgical vessel as in Claim 1,
   characterised in that
   the shield segment is at a low radial distance from the metal casing.
4. Metallurgical vessel as in Claim 3,
   characterised in that
   only the upper edge area of the shield segment is joined material-to-material with the bracing ring, and the opposite, free, edge area of the shield segment is moved, by means positioned on the bracing ring, in a vertical direction.
5. Metallurgical vessel as in Claim 2,
   characterised in that
   the shield segment (9) is a part of the metal casing.
6. Metallurgical vessel as in Claim 5,
   characterised in that
   the shield segment (9.1) has a recess (16) on the inside, the cross-sectional area of which is at least as large as the face area (17) of the inside of the lifting lug (11).
7. Method of manufacturing a metallurgical vessel for transporting molten metals, as in Claim 1, in the form of a welded structure, in which the metal casing is made up of separate tubular lengths of pipe, and the lifting structure - comprising the bracing rings and the shield segment - is joined to the metal casing, and the lifting lugs are welded into a hole in the shield segment,
   characterised in that
   each 360° bracing ring is divided into three segments (I, II, III), each with a circumferential extent of 120°, and the lifting structure is made up of two 120° segments (I, II) and two shield segments each with an extent of 60°.
8. Method as in Claim 7,
   characterised in that
   the cutting space resulting from the splitting of the 360° bracing ring is allowed for at the two 60° shield segments.
9. Method as in Claim 7 and 8,
   characterised in that
   in the case of a vessel which is oval in cross-section, the straight length that characterises the ovalness is allowed for in the shield segment.
10. Method as in Claim 7,
    characterised in that
    the one-piece shield segment is made from a heavy plate, whereby a heavy plate is rolled from an ingot casting, and after being cut to the appropriate shape is hot- or cold-bent by means of a press, and the contour and the hole (10) for the lifting lugs (11, 11') are then cut out by burning, and the final contour is then produced by machining.
11. Method as in Claim 10,
    characterised in that
    the deformation strain from the ingot casting to the heavy plate is at least the same as the forging reduction ratio of a conventionally produced shield segment.
12. Method as in Claim 7,
    characterised in that
    the bracing rings are rolled in the form of straight sections and are bent, after being divided into provisional lengths, into 120° segments, and the end areas are then machined.

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