WO2002078878A2 - Ingot mold for continuously casting a molten metal and method for displacing an ingot mold of this type - Google Patents
Ingot mold for continuously casting a molten metal and method for displacing an ingot mold of this type Download PDFInfo
- Publication number
- WO2002078878A2 WO2002078878A2 PCT/EP2002/002548 EP0202548W WO02078878A2 WO 2002078878 A2 WO2002078878 A2 WO 2002078878A2 EP 0202548 W EP0202548 W EP 0202548W WO 02078878 A2 WO02078878 A2 WO 02078878A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wall
- walls
- displaceable
- mold
- casting
- Prior art date
Links
- 238000005266 casting Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 title claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000009749 continuous casting Methods 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 4
- 238000005482 strain hardening Methods 0.000 claims description 4
- 238000012805 post-processing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005480 shot peening Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 6
- 239000000155 melt Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 230000036319 strand breaking Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/07—Lubricating the moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/05—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having adjustable walls
Definitions
- the invention relates to a mold for the continuous casting of a molten metal, in particular for the continuous casting of a molten steel, with walls surrounding a casting chamber, of which at least one wall can be displaced relative to the other walls in order to change the opening cross section of the casting chamber, the displaceable wall having at least one side surface , against which the wall adjacent to the side surface rests under the application of force when the sliding wall is at a standstill, at least one opening being formed in the side surface from which a fluid flows during the displacement of the sliding wall.
- the invention relates to a method with which can be used to adjust a mold with a variable opening cross-section.
- the casting spaces of such molds generally have the shape of a cuboid, which is delimited by two opposite wide walls and two narrow walls also arranged opposite one another.
- the walls generally consist of a copper alloy and can be provided with a nickel layer on their surface assigned to the casting chamber. In normal operation, the wide walls of such a mold are pressed under great pressure against the side faces of the narrow, movable walls assigned to them, so that the joints between the walls are tightly closed.
- the walls forming the narrow sides of the mold space are moved synchronously towards and away from one another. During this shifting process, they slide along the surfaces of the wide walls associated with the casting space, which in the meantime stand still.
- the object of the invention was to create a mold with an adjustable opening cross-section, in which the risk of melt entering the gaps between the walls of the mold was reduced to a minimum even during an adjustment process is reduced, and cold welding of the metal surfaces sliding on one another rules out.
- a method is to be specified which enables the adjustment of such a mold without the risk of fins being formed.
- this task in relation to the mold is thereby achieved solved that the opening is connected to a control device which, during the displacement, directs a pressurized gaseous fluid to the opening, which forms a gas cushion in the joint between the displaceable wall and the adjacent wall.
- the method for adjusting a mold for casting molten metal in particular molten steel, in which at least one of the walls surrounding the casting space is displaced relative to the others, with at least one side face of this displaceable wall being moved along the respectively adjacent wall
- a gaseous fluid under pressure is passed between the side face of the displaceable wall and the wall adjacent to it, which in the joint (15-18) between the displaceable wall (5, 6) and the adjacent wall (3,4) forms a gas cushion.
- the fluid is preferably a gas which does not influence the properties of the melt, to which a solid lubricant in powder form is additionally added if necessary.
- a fluid is pressed into the joints which are present between the respectively stationary and the moving walls of the mold.
- the fluid forms a barrier in the form of an aerostatic cushion, which counteracts the entry of melt into the joints even when the surfaces delimiting them no longer lie close together.
- Another advantageous effect of introducing fluid during the adjustment process into the joints which are critical with regard to the formation of fins is that the fluid flow flowing through the joints flushes away any dirt which is present on the surfaces delimiting the joints. In this way, a further source of danger which is responsible for the occurrence of cold welding in the prior art is eliminated in the case of molds according to the invention.
- This beneficial effect of the fluid introduced according to the invention is particularly noticeable in the lower region of the mold, in which there is already a solid strand shell lying against the walls of the mold and where deposits preferably occur.
- the fluid passed through the joints helps to cool the surfaces delimiting the joints, so that the risk of a premature decrease in the strength of the material due to excessive heating is additionally reduced.
- the invention can be implemented particularly successfully in molds known per se which have a cuboidal casting chamber.
- the walls delimiting the narrow sides of the casting space are preferably designed to be displaceable by the width of the casting space to be able to adapt the respective requirements.
- the opening intended for the exit of the fluid is preferably groove-shaped.
- a groove-shaped opening can easily be aligned so that the fluid is distributed in the critical zones of the respective joint.
- the arrangement and extent of the openings provided for the fluid outlet depend on the type of mold and the operating conditions that arise in practice.
- a particularly simple to produce, uniform distribution of the fluid flow into the respective joint of the invention is characterized in that the respective opening extends essentially over the entire height of the displaceable wall.
- a delivery of the fluid that is specifically geared to the state of the casting strand that changes over the height can be achieved, for example, in that a plurality of openings are arranged on the side surface in question, distributed over the height of the mold, the size and extent the respective opening according to the need for fluid in the respective height section of the mold.
- a particularly expedient embodiment of the invention for the practical use of molds according to the invention is characterized in that everyone Slidable wall is assigned a device for regulating the pressure of the fluid stream emerging from the openings.
- a control device for regulating the pressure of the fluid stream emerging from the openings.
- a further increase in wear resistance, in particular the security against the occurrence of cold welding, can be achieved in that the surface of the adjacent wall assigned to the side surface of the displaceable wall is cold-strengthened at least in the area within which the displaceable surface is in a new state or after a mechanical reworking Wall is movable.
- This work hardening compensates for the loss of strength that occurs in the course of the casting operation due to strong heating of the walls of the mold made of a copper alloy.
- Strain hardening can be produced, for example, by shot peening. The resulting roughness can increase the friction when the walls slide on each other.
- this roughening of the walls during the adjustment of the adjustable walls can have a favorable effect on the construction of a fluid barrier in the region of the joints intended according to the invention. Therefore, a further advantageous embodiment provides that the surface assigned to the side surface of the sliding wall adjacent wall in new condition or after mechanical post-processing is roughened at least in the area within which the displaceable wall can be moved.
- the safety with which the penetration of melt into the joints during the adjustment of the movable walls can be increased by starting the introduction of the fluid into the joints before the displacement of the movable wall begins. In this way it is ensured that the barrier generated by the fluid is effective as soon as the contact pressure between the walls of the mold is reduced for the adjustment of the sliding walls. For the same reason, the introduction of the fluid should be stopped after the displacement of the sliding wall is finished.
- Fig. 3 shows a detail of the mold with a removed wall in a partially sectioned, side view.
- the elements of the mold 1 are shown which are required to illustrate the invention.
- the mold 1 has a casting space 2, which is essentially cuboid and accordingly has a rectangular cross-sectional area.
- the casting space 2 is delimited by two oppositely arranged wide walls 3, 4 and two equally opposed narrow walls 5, 6.
- the width of the wide walls 3, 4 is dimensioned such that, with their surface 7, 8 assigned to the casting space 2, they each lie on one of those side surfaces 9, 10, 11, 12 of the narrow walls 6, 7 which are at right angles to the surface 13, 14 of narrow walls 5, 6 assigned to casting chamber 2.
- the walls 3 - 6 of the mold 1 consist of a copper alloy and can be provided with a nickel coating on their surface in contact with the melt in order to improve their wear behavior.
- the wide walls 3, 4 can each be subjected to a compressive force P, so that they are pressed against the side surfaces 9, 10 or 11, 12 of the narrow walls 5, 6 with high force when pressure is applied. In this state, the joints 15, 16, 17, 18 between the side surfaces 9, 10, 11, 12 and the surfaces 7, 8 of the wide walls 3, 4 assigned to them are tightly closed.
- the narrow walls 5, 6 can be synchronized with one another with the aid of an adjusting device, also not shown are moved towards or away from one another in order to adjust the width B of the casting space 2 of the mold 1.
- the side surfaces 9-12 slide on the surfaces 7, 8 of the wide walls 3, 4 assigned to them.
- the contact pressure acting on the wide walls 3, 4 is reduced to a pressure Pm, so that the narrow walls 5, 6 with greatly reduced friction, preferably approximately without friction, along the wide walls 3, 4 can be moved.
- the joints 15, 16, 17, 18 widened in this state between the walls 3, 4, 5, 6 are blocked by a gas which forms an aerostatic gas cushion and regulates, under pressure, prematurely to relieve the contact pressure P into the joints 15 - 18 is directed.
- a plurality of groove-shaped openings 19, 20, 21, 22 are formed in each of the side surfaces 9-12, each of which extends over a limited part of the height H of the side surfaces 9-12 and is distributed at regular intervals over the height H.
- the openings 19, 20, 21, 22 assigned to each of the side surfaces 9 - 12 are connected via supply channels to a supply line 23, each of which is supplied with gas by its own control device, not shown here.
- control elements there may also be control elements, not shown, by means of which the escape of gas from each of the openings 19, 20, 21, 22 can be regulated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002302401A AU2002302401A1 (en) | 2001-04-02 | 2002-03-08 | Ingot mold for continuously casting a molten metal and method for displacing an ingot mold of this type |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001116416 DE10116416A1 (en) | 2001-04-02 | 2001-04-02 | Mold for the continuous casting of a molten metal and method for adjusting such a mold |
DE10116416.5 | 2001-04-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002078878A2 true WO2002078878A2 (en) | 2002-10-10 |
WO2002078878A3 WO2002078878A3 (en) | 2003-03-13 |
Family
ID=7680119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/002548 WO2002078878A2 (en) | 2001-04-02 | 2002-03-08 | Ingot mold for continuously casting a molten metal and method for displacing an ingot mold of this type |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2002302401A1 (en) |
DE (1) | DE10116416A1 (en) |
WO (1) | WO2002078878A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10116416A1 (en) * | 2001-04-02 | 2002-10-17 | Thyssenkrupp Stahl Ag | Mold for the continuous casting of a molten metal and method for adjusting such a mold |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022265A (en) * | 1974-06-12 | 1977-05-10 | Nippon Steel Corporation | Method for enlarging the width of a cast piece in a continuous casting operation |
WO1998009750A1 (en) * | 1996-09-03 | 1998-03-12 | Ag Industries, Inc. | Improved mold surface for continuous casting and process for making |
FR2757430A1 (en) * | 1996-12-19 | 1998-06-26 | Lorraine Laminage | Variable width mould for the continuous casting of metal products |
DE10116416A1 (en) * | 2001-04-02 | 2002-10-17 | Thyssenkrupp Stahl Ag | Mold for the continuous casting of a molten metal and method for adjusting such a mold |
-
2001
- 2001-04-02 DE DE2001116416 patent/DE10116416A1/en not_active Withdrawn
-
2002
- 2002-03-08 WO PCT/EP2002/002548 patent/WO2002078878A2/en not_active Application Discontinuation
- 2002-03-08 AU AU2002302401A patent/AU2002302401A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022265A (en) * | 1974-06-12 | 1977-05-10 | Nippon Steel Corporation | Method for enlarging the width of a cast piece in a continuous casting operation |
WO1998009750A1 (en) * | 1996-09-03 | 1998-03-12 | Ag Industries, Inc. | Improved mold surface for continuous casting and process for making |
FR2757430A1 (en) * | 1996-12-19 | 1998-06-26 | Lorraine Laminage | Variable width mould for the continuous casting of metal products |
DE10116416A1 (en) * | 2001-04-02 | 2002-10-17 | Thyssenkrupp Stahl Ag | Mold for the continuous casting of a molten metal and method for adjusting such a mold |
Also Published As
Publication number | Publication date |
---|---|
AU2002302401A1 (en) | 2002-10-15 |
DE10116416A1 (en) | 2002-10-17 |
WO2002078878A3 (en) | 2003-03-13 |
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