DE10156966C2 - Electro-slag remelting plant with a mold, a hood and a motor-driven electrode rod - Google Patents

Description

The invention relates to an electroslag remelting plant with a stationary mold for building a block from remelted Material with a vertical, motor-driven electrodes rod for the feed of the melting electrode and with an upper half of the mold arranged at least two across the longitudinal axis of the electrode rod movable shell-shaped parts existing hood surrounding the melting electrode at least one concentric to the electrode rod at the top End of the hood provided opening for the passage of the electrical dens tangering.

A remelting plant is known from DE-AS 20-31 708, in which the hood serves to reduce radiation losses, which is why the Hood is lined with mineral thermal insulation. The Opening in the hood of the known system is used for the passage of the Melting electrode itself and is accordingly large in size ned.  

Furthermore, DE-OS 42 04 757 describes a remelting furnace a crucible and a placed on it, facing the outside sealed boiler that can be lifted off the crucible by a lifting device, which has a passage through which by means of a seal and a bellows sealed an electrically fusible elec tread rod leads into the crucible, one of a cradle lower platform held in a stationary, supported weighing platform carries the seal of the bushing to which the bellows with its upper end is attached while its lower end is on the boiler seated. The lifting device is supported on the weighing platform and trained to lift the lower platform, the boiler through a game when the kettle sits on the crucible having driver connection with the lower platform Verbin manure.

Finally, an electro-slag remelting plant is known (DE-OS 39 01 297) with a mold for building a block and an over the hood arranged hood, the hood with respect to their vertical axis is divided into laterally movable shells, by which each with its lower edge largely gas-tight with the upper Part of the mold connected and with its upper edge on a second Sealing point is sealed gas-tight with respect to the electrode rod, the hood having an interior of such cross section and has such a height that the upper end of the melting point tread in their most raised position below the two ten sealing point of the hood.

The present invention has for its object a To create a remelting plant in which the melting chamber is pressure-tight is closable, at which the pressure in the melting chamber in a wide range is adjustable and with the molds of different sizes and likewise also melting electrodes with different diameters  can be used without the need for different hoods To provide configuration and size.

This object is achieved in that between the mold and the multi-layer hood the the bottom of the Hood and the upper edge of the mold connecting pipe pressure-tight Connection is provided, the pipe of a protective gas source connected and the lower edge ver with a flange see is the adaptation to molds of different through knife allowed.

Further features and details are in the claims described and labeled in more detail.

The invention allows for a wide variety of design options; one of them is shown in more detail in the attached drawings and described.

The drawing shows an electro-slag remelting, which is installed on a hall floor 2, wherein a mold 4 projects through an opening 3 in the hall floor 2 in a pit of which is shown only the pit floor. 5 The mold 4 is a conventional, water-cooled stand mold. Above the hall floor 2 there is a furnace frame 6 with several vertical columns 7 , 8 , of which only two are shown. The columns 7 , 8 carry a support 9 , which is provided with a central opening 10 through which an electrode rod 11 is passed, the lower end of which is firmly connected to the melting electrode 12 , which in turn extends into the liquid slag bath 13 above the liquid metal sump 14 of the solidified remelting block 15 protrudes.

The upper end of the electrode rod 11 is in operative connection with the Antriebsaggre gat 16 . A measuring platform 17 , which extends over several weight measuring elements 18 , 18 ',. , , supported on the platform 9 , is connected to an articulated bearing 27 and serves to hold and guide the electrode rod 11 .

Above the mold 4 , a pipe socket 19 is attached, which is supported on the mold 4 in a pressure-tight manner at its lower end by means of a flange 20 and on which, on the other hand, there is a double-shell hood 21 , 21 ', the two half-shells 21 , 21 ' of hooks 22 , 22 'are held, which can be moved in the arrow directions A and B, the drawing drawing shows the half-shells 21 , 21 ' in both positions. Both mirror-symmetrically pushed together half shells 21 , 21 'are sealed against the pipe socket 19 by means of an elastomeric ring seal 23 .

At the upper end of the hood formed by the two half-shells 21 , 21 ', a sliding seal 24 is provided through which the electrode rod 11 is passed. In addition, a non-Darge presented power supply via the cable 25 for the electrode rod 11 is available. At the pipe socket 19 , a pipe 26 is ruled out, via which the space 32 , 34 above the slag bath 13 can be filled with a protective gas (e.g. argon) so that the ambient air does not get to the melt 14 and the remelting defined and adjustable pressure can take place. Also shown are a line 28 for the gas discharge, from the space 32 filled with protective gas and a measuring device 31 for displaying the gas pressure in this space 32 . In parallel to the electrode rod 11 , rails 29 , 30 are provided, which are used to return the melt current.

The subject matter of the actual invention is described as follows: Above the mold 4 there is a pipe socket 19 which is provided with a flange 20 which is dimensioned and configured such that molds 4 with different diameters D can fit on it on the one hand and on the other hand, consumable electrodes 12 with different external dimensions E and configurations are adaptable. The other outer dimensions of the pipe socket 19 are also adapted to the two-shell hood 21 , 21 ', so that it can be ensured by means of a suitable pipe socket 19 and a plate-shaped support 36 that the annular space 32 between a melting electrode 12 and the inner wall of the mold 4 or The inner wall of the pipe socket 19 or the annular space 39 can always be kept as small as possible without major changes to the remelting system being necessary. It is also possible, by filling the annular space 32 , 39 or the melting space 34 with argon, to prevent the inflow of outside air to the melt 14 , which enables more precise control of the melting rate. The ring seal 23 provided between the pipe socket 19 and the two-part hood 21 , 21 'enables both open and closed melting operation, so that no changeover times are incurred. The self-aligning bearing or bearing with universal joint or universal joint 27 also allows very precise guidance of the vertically hanging melting electrode 12 in the mold 4 or in the hood 21 , 21 'and the pipe socket 19 .

List of items

2

shop floor

3

opening

4

mold

5

pit floor

6

oven rack

7

Vertical column

8th

Vertical column

9

In stock

10

Central opening

11

electrode rod

12

consumable

13

slag

14

metal sump

15

remelting

16

power unit

17

measurement platform

18

Weight measuring element

19

pipe socket

20

flange

21

double-shell hood

22

hook

23

ring seal

24

sliding seal

25

conductor

26

pipeline

27

Spherical plain bearings

28

withdrawal line

29

conductor rail

30

conductor rail

31

pressure monitor

32

annulus

34

hearth

36

In stock

39

annulus

50

metal bellows

Claims (4)

1. Electro-slag remelting system with a stationary mold ( 4 ) for building a block ( 15 ) made of remelted material with a vertical motor-driven electrode rod ( 11 ) for feeding the melting electrode ( 12 ), with one arranged above the mold ( 4 ) , consisting of at least two hoods which are movable transversely to the longitudinal axis of the electrode rod ( 11 ) and consist of shell-shaped parts ( 21 , 21 ') and surround the melting electrode ( 12 ), with at least one opening ( 24) provided at the upper end of the hood and concentric with the electrode axis ) for the gas-tight passage of the electrode rod ( 11 ), with one arranged between the mold ( 4 ) and the hood ( 21 , 21 ') and the lower edge of the hood ( 21 , 21 ') with the upper edge of the mold ( 4 ) pipe socket ( 19 ) connecting in a pressure-tight manner and with a pipe ( 26 ) connecting the space ( 32 ) enclosed by the pipe socket ( 19 ) with a protective gas source. 2. Electro slag remelting plant according to claim 1, characterized in that the pipe socket ( 19 ) is connected to a suction line ( 28 ) via which the gas from the space ( 32 ) above the liquid slag bath ( 13 ) can be sucked off. 3. electro-slag remelting plant according to claims 1 and 2, characterized in that the pipe socket ( 19 ) is provided with a flange ( 20 ) at its lower end, which is dimensioned such that it on the upper end face of the mold ( 4 ) rests pressure-tight. 4. Electro slag remelting plant according to the preceding claims, characterized in that the pipe socket ( 19 ) is provided with a nose ( 29 ), via which the pipe socket ( 19 ) can be connected to a stationary holder which pivots the pipe socket ( 19 ). allowed transversely to the longitudinal axis of the electrode rod ( 11 ).