EP3894111A1 - Coulée semi-continue d'un lingot avec compression du métal en cours de solidification - Google Patents
Coulée semi-continue d'un lingot avec compression du métal en cours de solidificationInfo
- Publication number
- EP3894111A1 EP3894111A1 EP19845584.2A EP19845584A EP3894111A1 EP 3894111 A1 EP3894111 A1 EP 3894111A1 EP 19845584 A EP19845584 A EP 19845584A EP 3894111 A1 EP3894111 A1 EP 3894111A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- bottom plate
- ingot
- axis
- side wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/005—Castings of light metals with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C
Definitions
- the invention relates to the manufacture of metal ingots, in particular in a titanium alloy or an intermetallic alloy based on titanium, by semi-continuous casting. More specifically, the invention relates to the non-optimization of the wear properties of finished or remelted products made in these metallic materials.
- the liquid metal 2 ′ whose composition corresponds to the composition sought in the end flows from the last overflow basin into the crucible.
- the wall of the crucible 12 ′ is generally made of copper, a copper alloy or a material with high thermal conductivity and is cooled so as to be maintained at a temperature below the melting or deterioration temperature of the material constituting it, for example by circulation of a fluid or a liquid at a defined temperature thermostatically controlled. Copper pollution is possible on the surface, accentuating the chemical dispersion of the heart / skin.
- the liquid metal 2 ′ cools by extracting calories from below (the crucible having no bottom) and solidifies as close as possible to the wall.
- the solidified metal 3 ′ then acts as a container for liquid metal 2 ′ which continues to pour progressively from the basins and its solidification front (corresponding to the border between the solidified metal 3 ′ and the liquid metal 2 ′ which forms a well) is semi-ovoid to hemispherical in shape.
- the solidified metal 3 ' forms the metal ingot (s). Each ingot is gradually extracted from the crucible from below using a sliding rod to maintain the level of liquid metal in the crucible. For this, the speed of descent of the sliding rod is proportional to the speed of filling of the crucible with liquid metal (or speed of casting).
- This process thus makes it possible to obtain metal ingots.
- the metal solidification macrostructure is very heterogeneous and anisotropic.
- the chemical composition of the metal is indeed dispersed.
- the dendritic grains are tending to be equiaxed and in certain cases, segregated and positive exudation can occur.
- the dendritic grains are columnar or basaltic. More specifically, solidification in semi-continuous casting leads to creating a solidification with columnar (or basaltic) grains in a direction perpendicular to the solidification front and which propagate towards the middle of the surface of the liquid well.
- the properties of the dendrites along the columns (or basalts) are however not the same as transverse to them so that a segregation is marked more fragile between each column or basalt.
- this laminated structure with two types of microstructures creates dispersion during machining.
- the usage properties of the ingots thus obtained are therefore not optimized (the dimensioning being done from the minimum dimensioning curves taking into account the dispersion of the properties and the responses to machining), insofar as residual porosities can be present in the raw solidification ingot.
- a dispersion of the responses to machining as well as a dispersion of the rheological laws and the laws of forgeability of the gross solidification microstructure in the three directions of the ingot and according to the position in the ingot.
- An objective of the invention is therefore to propose a method of manufacturing a semi-continuous casting of a metal ingot, in particular in a titanium alloy or an intermetallic alloy based on titanium, the macrostructure of which is more uniform and more isotropic than the columnar macrostructure obtained in conventional manufacturing processes, which is simple to carry out at a moderate cost.
- the invention proposes a method for manufacturing a metal ingot by continuous casting comprising the following steps:
- the method further comprises a step S5 of applying a compressive force to the metal which is present between the bottom plate and the side wall, said force compression being applied along a second axis parallel to the first axis so as to deform said metal and to obtain an ingot having a second width along this first axis which is less than the first width.
- step S5 of applying the compression force the metal is solidifying.
- the manufacturing method further comprises, after step S5, at least one additional step of application to the ingot of a compression force along a third axis so as to deform it and to obtain an ingot having a third width along this third axis, the third width being less than the second width.
- the manufacturing process also comprises, during step S5, the application of an additional compressive force to the metal which is present between the bottom plate and the side wall along an axis which intersects with the first axis.
- step S5 the bottom plate is also deformed and the manufacturing process further comprises a subsequent step of cutting the bottom plate.
- the invention provides a tool for the manufacture of a metal ingot by semi-continuous casting in accordance with a manufacturing process as described above, said tool comprising the following elements:
- an overflow tank configured to fuse the liquid metal so as to obtain metal
- a crucible having a bottom plate and at least one side wall together delimiting an enclosure configured to receive the liquid metal, the side wall having a first width along a first axis,
- an actuator configured to move the bottom plate of the crucible relative to the side wall of the crucible at a controlled speed dependent on a flow speed of the liquid metal
- - deformation means configured to apply a compressive force to the metal which is present between the bottom plate and the side wall, said compressive force being applied along a second axis parallel to the first axis so as to deform said metal and to obtain an ingot having a width along this first axis which is less than the first width.
- the tool further comprises additional deformation means extending in the same plane as the deformation means and configured to apply a compressive force simultaneously to the metal.
- the tool further comprises additional deformation means extending downstream of the deformation means and configured to apply a compressive force to the metal at the outlet of the deformation means.
- the deformation means comprise at least one of the following elements: a press, a rolling mill.
- a groove is formed in a deformation surface of the deformation means in order to constrain in volume the metal.
- Figure 1 illustrates a conventional semi-continuous casting manufacturing process.
- FIG. 2 illustrates an example of a tool that can be implemented in a manufacturing process by semi-continuous casting in accordance with an exemplary embodiment of the invention, before application of the compression forces to the intermediate ingot.
- Fig 3 illustrates the tool of Figure 2 when applying compression forces to the intermediate ingot using presses.
- FIG. 4 illustrates a second example of a tool that can be implemented in a manufacturing process by semi-continuous casting in accordance with an exemplary embodiment of the invention, when applying compression forces to the intermediate ingot at using rolling mills.
- FIG. 5 is a flowchart illustrating the steps of an exemplary embodiment of a manufacturing process by semi-continuous casting according to the invention.
- Figure 6 illustrates an example of rollers in which a groove is formed.
- the invention proposes to produce a metal ingot by semi-continuous casting, by applying compression forces to the metal being solidified 3 in order to break the dendrites to obtain grains whose three-dimensional structure is improved (recrystallization from equiaxed grains).
- This hot forming therefore makes it possible, in a simple and inexpensive manner, to significantly improve the properties of the material and the final machining conditions.
- the metal can in particular comprise a titanium-based alloy or a titanium-based intermetallic composite.
- the titanium-based alloy may for example comprise at least one of the following alloys: Ti17 (Ti-5AI-2Sn-2Zr-4Mo-4Cr), TiBeta16, Ti21 S (Ti- 15Mo-3Nb-3AI-0.2Si , ASTM Grade 21), TÎ6242 (Ti-6AI-2Sn-4Zr-2Mo), TÎ6246 (Ti6AI-2Sn-4Zr-6Mo), TÎ5553 (Ti-5AI-5Mo-5V-3Cr), TÎ1023 (Ti-10V-2Fe -3AI), TA6V (TÎ-6AI-4V), etc.
- the intermetallic alloy may for example comprise an intermetallic alloy based on titanium, including in particular titanium aluminides, among which:
- Ti-48AI-1 V-0.3C Ti-48AI-2Cr-2Nb (also known as “GE 48-2-2") or Ti-48AI-2Nb-0.75Cr-0.3Si (also known as "Daido RNT650");
- TÎ-45AI- 2Nb-2Mn + 0.8TiB2 also known as "Howmet 45XD”
- Ti-47AI-2Nb-2Mn + 0.8TiB2 also known as "Howmet 47XD”
- Ti-47AI-2W-0,5Si-0,5B also known as "ABB-23”
- TÎ-48AI-1, 3Fe-1, 1 V-0.3B TÎ-45AI- 2Nb-2Mn + 0.8TiB2
- Ti-47,3-AI-2,2Nb-0,5Mn-0,4W-0,4Mo-0,23Si Ti-46,5AI- 3Nb-2Cr-0.2W-0.2Si-0.1 C (also known as "K5SC"), TI-46AI-5Nb-1 W, TÎ-47AI- 3.7 (Cr, Nb, Mn, Si) -0.5B (also known as "GKSSTAB”), the Ti-45AI-8 (Nb, B, C) (also known as "GKSS 20 TNB”), Ti-46.5AI-1, 5Cr-2Nb-0.5Mo-0.13B-0.3C (also known as "395M”), Ti-46AI-2,5Cr-1 Nb-0,5Ta-0,01 B (also known as "Plansee y-MET”), Ti-47AI-1 Re-1W-0.2Si (also known as "On
- the Ti-48AI-2Cr-2Nb alloy comprises, in atomic percentage, 48% of AI, 2% of Cr, 2% of Nb, and titanium (Ti) in addition to 100%.
- liquid metal 2 is melted so as to obtain liquid metal 2.
- This step can be carried out conventionally in a tool 1 comprising one or more overflow tanks 10 from raw materials having either a chemical composition close to the composition sought in the end, or specific chemical compositions.
- the overflow basin (s) 10 can be made of a material comprising copper, a copper alloy or any other material with high thermal conductivity. Each overflow basin 10 is maintained at a temperature below the melting or deterioration temperature of the material constituting it, for example by circulation of a fluid or a liquid such as water at a defined temperature thermostatically controlled.
- the fusion of the raw materials in order to obtain the molten liquid metal 2 can be carried out by any heating means 11, such as for example using at least one of the following heating means: arcs electric, by induction, by plasma torch and / or by electronic bombardment.
- the industrial means that can be used for this fusion include a melting furnace by induction under vacuum or under partial pressure, a melting furnace by plasma torches under controlled pressure (known by its English terminology “PAM furnace”), an oven melting by electronic vacuum bombardment (known by its English terminology “EB furnace”), or a melting furnace combining several of these heating means.
- a melting furnace by induction under vacuum or under partial pressure a melting furnace by plasma torches under controlled pressure
- EB furnace oven melting by electronic vacuum bombardment
- EB furnace oven melting by electronic vacuum bombardment
- the atmosphere can be controlled according to the applications chosen for the final ingot.
- the oven can be placed under vacuum in order to avoid any chemical reaction with the molten liquid metal 2.
- the oven can be placed under a controlled pressure of inert gas, in order to '' avoid any chemical reaction with molten liquid metal 2.
- the oven can be placed under a controlled pressure of specific gas to allow a chemical reaction with the liquid metal and to charge the chemical composition of the alloy with this gaseous element.
- This first step S1 of metal melting being conventional, it will not be detailed further here.
- the liquid metal 2 thus obtained is transferred by flow into a crucible 12, either directly from the first overflow tank 10, or via one or more intermediate overflow tanks 10, for example by overflow.
- the crucible 12 comprises a bottom plate 14 and at least one side wall 13 together delimiting an enclosure configured to receive the liquid metal 2.
- the shape of the crucible 12 depends on the shape of the final ingot that one seeks to obtain.
- the side wall 13 of the crucible 12 can therefore comprise only a single section, in the case where the crucible 12 is of section circular or curved, or more sides in the case of a crucible 12 of rectangular or any shape.
- a maximum width of this side wall 13 is equal to a first width L1.
- width we will understand here the distance between two parallel straight lines (or “support lines") which are tangent to the closed curve formed by the internal face of the side wall 13 radially delimiting the enclosure at two distinct points.
- the maximum width then corresponds to the largest width of the internal face delimiting the enclosure.
- the maximum width is equal to the diameter of the circle.
- the maximum width corresponds to the diagonal of the polygon.
- the bottom plate 14 is configured to seal the crucible 12 in leaktight manner and to avoid leakage of liquid metal 2.
- the bottom plate 14 can be wider than the side wall 13 and come into abutment against its underside of so as to form a tight seal.
- the bottom plate 14 can fit into the enclosure with adjustment.
- the width of the bottom plate 14 is then substantially equal to the width of the side wall 13 at any point on its circumference so that the bottom plate 14 comes into surface contact with the internal face of the side wall 13, the contact forming a tight seal.
- the width of the bottom plate 14 at the first axis X1 is also equal to the first width L1.
- the bottom plate 14 is preferably made of copper, copper alloy, aluminum, aluminum alloy, or any other material with high thermal conductivity and deformable at the melting temperature of the liquid metal 2. In this way , the bottom plate 14 diffuses the heat coming from the metal, thus facilitating its cooling and the formation of the solidification front 4. If necessary, the bottom plate 14 can be sprayed or sprayed with a cooling fluid, such as l 'water.
- a cooling fluid such as l 'water.
- the bottom plate 14 can be covered with a film forming a diffusion barrier in order to avoid the diffusion of the chemical elements from the bottom plate 14 to the metal.
- the bottom plate 14 of the crucible 12 is moved along a longitudinal axis X relative to the side wall 13 at a controlled speed dependent on a flow speed of the liquid metal 2 so as to pull the metal 3 outside the crucible 12.
- an actuator is fixed on the bottom plate 14 so as to allow it to be drawn along a longitudinal axis X which is normal to the bottom plate 14.
- the actuator can for example be fixed on a rod 16 coaxial with the longitudinal axis X, the rod 16 itself being fixed on the plate in order to move the plate along said axis X.
- the speed of descent of the bottom plate 14 is proportional to the speed of casting in order to maintain the level of liquid metal 2 in the crucible 12.
- a fourth step S4 which is concomitant with the third step S3, the liquid metal 2 gradually solidifies. Solidification starts at the bottom plate 14 and gradually propagates towards the mouth 15 of the crucible 12 through which the liquid metal is transferred 2.
- the liquid metal 2 solidifies as close as possible to the side wall 13 and the bottom plate 14, and the solidification front 4 gradually moves away from the bottom plate 14 as it is moved.
- the solidified metal 3 then acts as a container for the liquid metal well 2.
- the side wall 13 and the bottom plate 14 can be cooled in a conventional manner, for example by circulation of a fluid or a liquid such as water at a defined temperature thermostatically controlled. Furthermore, the liquid metal 2 also solidifies between the bottom plate 14 and the side wall 13 and forms a seal with the side wall 13, thus preventing any leakage of liquid metal 2.
- a compression force is applied at least once to the metal being solidified 3 (below, intermediate ingot) in order to break the dendrites.
- the tool 1 comprises deformation means 20 configured to apply compression forces to the intermediate ingot 3.
- deformation means 20 can in particular comprise one or more presses 21 and / or one or more rolling mills 20.
- the press 20 and the rolling mill (s) 20 are then distributed around the longitudinal axis X in one or more rows (depending on whether the metal being solidified 3 receives one or more successive compression forces).
- the tool 1 comprises at least two rows in series of deformation means 20 along the longitudinal axis X.
- the metal 3 to which the compression force is applied must be in the course of solidification but must not yet be. It must be in a phase comprising both liquid metal and solid metal (also called “forged melt”), in which the porosity of the metal is better than when it is in the solid state.
- liquid metal and solid metal also called "forged melt”
- the porosity of the metal is better than when it is in the solid state.
- Liquid metal 2 is 100% liquid and its temperature is higher than a temperature called Liquidus. Between these two states, the metal is said to be pasty (forged molten phase) with a mixture of liquid and solid with a temperature between the Solidus and the Liquidus. During the first stages of compression, we try to have the maximum of this area under the hammers or working cylinders.
- step S5 is therefore not hot static compression.
- the temperature of the ingot during step S5 is heterogeneous and included in a temperature gradient between the skin cooled by the metal 3 at a temperature clearly below the Solidus temperature up to the core at a temperature which will be sought to be higher.
- Solidus temperature a portion of pasty metal taken under compression.
- the core temperature is higher than Liquidus temperature.
- heating adiabatic which increases the temperature, all the more so when the temperature is low. This is true for the first stages of the deformation means 20 (that is to say the first trains of hammers or cylinders). other stages, the core temperature may be lower than the solidus temperature.
- step S5 the compressive force is applied perpendicular to the longitudinal axis X, in a direction parallel to the first axis X1 so as to deform the metal and to obtain an intermediate ingot 3 having a second width L2 along this direction which is less than the first width L1.
- a second compression force can also be applied:
- step S6 see axes X2 and X3 in Figures 3 and 4).
- steps S5, S6 make it possible to break the columns and the basalts during the solidification of the metal 3 while it is still in the semi-liquid (pasty) phase, to cause an equiaxed recrystallization in the intermediate ingot 3 and to improve the surface condition of the skin of the final ingot.
- At least two successive compression forces are applied to the metal being solidified 3, in order to obtain a final ingot having a macrostructure the grains of which are equiaxed.
- the final ingot then has a third width L3, which is less than the first and the second width L1, L2.
- each press 20 comprises a pair of hammers 21 placed opposite moving along the same direction intersecting the longitudinal axis X and whose movement is synchronized. If necessary, several pairs of hammers 21 can extend in the same plane and together form a single row. The pairs of hammers 21 of the same row can then be synchronized so as to simultaneously apply the compressive force to the intermediate ingot 3 opposite and thus constrain it in volume.
- the pairs of hammers 21 extend in parallel planes each forming a row.
- the tool 1 can comprise a number greater than or equal to two pairs of hammers 21, the number of hammers 21 always being an even number.
- each pair of hammers 21 is moved along the longitudinal axis X at the same speed as the bottom plate 14 in order to follow the intermediate ingot 3 during the application of the compressive force and to eject it downwards, before returning to their initial position in order to apply the compression force to the next intermediate ingot 3 (which is immediately above that which has just been compressed).
- the speed of movement along the longitudinal axis X of the hammers 21 is substantially equal to the speed of casting during the application of the compression force.
- Each press 20 can be mechanical, hydraulic or mixed.
- each rolling mill 20 comprises two opposite rollers 23 extending along the first axis X1. If necessary, several pairs of rollers 23 can extend in the same plane and together form a single row. The pairs of rollers 23 of the same row can then be positioned so as to constrain in volume the intermediate ingot 3.
- the pairs of rollers 23 can extend in parallel planes each forming a row.
- the tool 1 can comprise a number greater than or equal to two pairs of rollers 23, the number of rollers 23 always being an even number.
- step S5 the speed of rotation of the rollers 23 is chosen so that their rolling surface follows the intermediate ingot 3 when the compressive force is applied and ejected downwards. If necessary, the speed of each pair of rollers 23 can be adapted analogously to what is already done in the case of duo rolling lines. More precisely, in the case of duo rolling, two rollers, cylindrical or diabolo, of the rolling mill work as well in effort as in deformation. The air gap between the rollers is frozen and their rotation causes the scrolling. The rollers are cooled with water.
- a groove 22 can be formed in the surface for applying the compressive force of each hammer 21 and of each roller 23 so as to constrain in volume the intermediate ingot 3 (see FIG. 6 ).
- the intermediate ingot 3 is forced to elongate along the longitudinal axis X, the groove 22 being shaped so as to reduce its section and its width by preventing its expansion in a plane radial to the longitudinal axis X.
- the shape and dimensions of the groove 22 are chosen as a function of the shape and the dimensions of the side wall 13 of the crucible 12 and of the shape (round, square, rectangular, prismatic section, any profile, etc.) and desired dimensions for the final ingot.
- said deformation means 20 when several pairs of deformation means 20 are placed in the same plane normal to the longitudinal axis X, said deformation means 20 are positioned relative to the intermediate ingot 3 so that their application surface forms a chute ( whose shape and dimensions depend on those of the side wall 13 of the crucible 12 and of the final ingot), in order to constrain the volume of said intermediate ingot 3 and to guarantee its longitudinal deformation.
- the deformation means 20 are preferably cooled and lubricated, for example with water.
- the tool 1 may further comprise one or more heating means, extending at the level of the deformation means 20, in order to improve the control of the temperature of the intermediate ingot 3, to increase the temperature of rolling and reducing the stresses on the deformation means 20.
- the speed of movement of the deformation means 20 (translation of the hammers 21 and rotation of the rollers 23) is adjusted so as to guarantee a uniform application of the compression force to the intermediate ingot 3. Any section of the metal being solidified 3 from of the enclosure is therefore compressed during step S5.
- the bottom plate 14 is also deformed during step S5 in order to guarantee that all the metal leaving the enclosure is well compressed by the deformation means 20 (see FIGS. 3 and 4). This also makes it possible to simplify the process S since it is not necessary to separate the hammers 21 or the rollers 23 to avoid deforming the bottom plate 14 and allowing it to pass.
- the tool 1 may comprise a probe configured to detect the stresses generated on the first row, and therefore the arrival of the bottom plate 14 at the level of the deformation means 20.
- the casting speed can be increased from the moment the bottom plate 14 reaches the level of the first row of press (s) 20 and / or rolling mill (s) 20, so that the depth of the liquid metal well 2 can be closest to the air gap of the first row and thus guarantee that the metal of the intermediate ingot 3 is well in semi-liquid phase.
- the casting speed can be increased when the probe detects the stresses generated on the first row of rollers 23 or hammers 21.
- the deformation means 20 can form all or part of the actuator and be used for moving the bottom plate 14 and the metal being solidified 3 downward during step S3.
- the air gap of the means for moving the most downstream row may be substantially equal to the width of the rod 16.
- the width and the shape of the rod 16 are therefore substantially identical to the width and to the shape of the final ingot.
- the actuator may include a specific mechanism configured to move the rod 16 until the bottom plate 14 reaches the first row of deformation means 20. Then, if necessary, this specific mechanism can be disengaged from the rod 16, the role of the actuator being taken up by the deformation means 20 so that the displacement of the rod 16 is carried out simultaneously with the displacement (translation of the hammers 21 or rotation of the rollers 23) of the deformation means 20.
- the speed V1 of the metal leaving the tool 1 is determined as a function of the final radius Ri sought for the ingot 3, of the initial radius Ro of the ingot and its casting speed Vo (at the mouth 15 of tool 1):
- V1 Vo * R0VR1 2
- the speed V1 at the outlet of the tool 1 is then defined as follows:
- Vi Vo * S0 / S1
- the speed V n of the ingot 3 at the exit of the stage n of the rolling mill 20 is defined as follows:
- Vn Vn-1 * Sn-l / Sn-
- the speed of rotation of the rollers n is then determined by taking into account the smallest radius of the diabolo-shaped roller, the speed V n of the ingot 3 at the outlet of the stage n of rollers and a factor which takes account of the slip at temperature to be defined by tests.
- Cste is a constant function of the temperature and the slip to define by tests.
- VL Vn-1 + N * A / (Sn-i + Sn) * VR * Cste
- N is the number of hammers per stage.
- Vn VL + N * A / (Sn-i + Sn) * VR * Cste
- the pressure applied by the hammers 21 / rollers 23 is determined as a function of the air gaps, of the ingot section ratios 3 (S n -i / S n ) and of the flow constraints so as not to reach the maximum power of the presses or of the rolling mill 20.
- the average flow stress depends on the average temperature (between the core and the periphery) and on the deformation speed as a function of the above speeds.
- the method S of the invention makes it possible to reduce the very heterogeneous macrostructures linked to columnar solidification, to positive segregations and to aligned segregations obtained with conventional semi-continuous castings.
- the properties of the final ingot are significantly improved, as are the machining conditions of this raw solidification structure.
- Method S makes it possible to obtain ingots which can be transformed so as to obtain:
- the final ingots are deformed hot by rolling, forging, stamping, extrusion, etc. to form bars or billets for further cold or hot deformation and / or machining.
- the hot isostatic treatment can be eliminated before machining.
- the final ingots are cut into pieces or blanks and can be deformed hot as close as possible to the ribs of the final part by forging, rolling, stamping, extrusion, etc. without dispersion of the final microstructures on the part.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Forging (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1872880A FR3089833B1 (fr) | 2018-12-13 | 2018-12-13 | Coulée semi-continue d’un lingot avec compression du métal en cours de solidification |
| PCT/FR2019/053056 WO2020120919A1 (fr) | 2018-12-13 | 2019-12-13 | Coulée semi-continue d'un lingot avec compression du métal en cours de solidification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3894111A1 true EP3894111A1 (fr) | 2021-10-20 |
| EP3894111B1 EP3894111B1 (fr) | 2024-04-10 |
Family
ID=66286486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19845584.2A Active EP3894111B1 (fr) | 2018-12-13 | 2019-12-13 | Coulée semi-continue d'un lingot avec compression du métal en cours de solidification |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11673186B2 (fr) |
| EP (1) | EP3894111B1 (fr) |
| CN (1) | CN113272085B (fr) |
| FR (1) | FR3089833B1 (fr) |
| WO (1) | WO2020120919A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114798735B (zh) * | 2021-01-28 | 2023-04-07 | 华中科技大学 | 一种复合增等量制造方法 |
| CN116673449B (zh) * | 2022-10-09 | 2025-08-01 | 西北工业大学 | 一种抑制双辊薄带连铸铝合金偏析的工艺设计方法 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE510361C (de) * | 1927-06-11 | 1930-10-18 | Siegfried Junghans | Stranggussvorrichtung, bei der die Bodenoeffnung der Giessform durch einen aus feuerfestem Werkstoff bestehenden Dichtungskoerper abgeschlossen wird |
| GB1087154A (en) * | 1964-07-27 | 1967-10-11 | British Iron Steel Research | Improvements in and relating to the production of metal strip |
| US4232727A (en) * | 1978-11-01 | 1980-11-11 | Kennecott Copper Corporation | Method and apparatus for the continuous production of strip |
| JPS6040922B2 (ja) * | 1980-04-02 | 1985-09-13 | 三菱マテリアル株式会社 | チタンの連続鋳造圧延法 |
| JPS57175065A (en) * | 1981-04-18 | 1982-10-27 | Kubota Ltd | Production of dissimilar diameter circular columnar body by continuous casting and continuous molding |
| JPS60162564A (ja) * | 1984-01-31 | 1985-08-24 | Nippon Steel Corp | 垂直型連続鋳造方法 |
| JPS6277809A (ja) * | 1985-09-30 | 1987-04-10 | 三菱電機株式会社 | 接地開閉器の検電装置 |
| JPS6333163A (ja) * | 1986-07-26 | 1988-02-12 | Kawasaki Steel Corp | 大型鋼塊の製造方法 |
| JPH0628787B2 (ja) * | 1988-06-03 | 1994-04-20 | 川崎製鉄株式会社 | 連続鋳造における鋳片ストランドの大圧下方法 |
| JP3100491B2 (ja) * | 1993-03-30 | 2000-10-16 | 新日本製鐵株式会社 | 連続鋳造用ダミーバーおよび連続鋳造機内鋳片圧下方法 |
| JPH07118773A (ja) * | 1993-10-21 | 1995-05-09 | Nippon Steel Corp | チタンまたはチタン合金圧延材の製造方法 |
| US8196641B2 (en) * | 2004-11-16 | 2012-06-12 | Rti International Metals, Inc. | Continuous casting sealing method |
| JP2012525982A (ja) * | 2009-05-07 | 2012-10-25 | ポッパー、マイケル、ケイ. | チタン合金を製造するための方法及び装置 |
| EP2679321A4 (fr) * | 2011-02-25 | 2016-11-09 | Toho Titanium Co Ltd | Four de fusion pour la fusion de métal |
| JP5704642B2 (ja) * | 2011-02-25 | 2015-04-22 | 東邦チタニウム株式会社 | 金属製造用溶解炉 |
| CN102303102B (zh) * | 2011-09-30 | 2013-09-18 | 中冶南方工程技术有限公司 | 一种特厚板坯连铸工艺和连铸机 |
| JP5741402B2 (ja) * | 2011-11-25 | 2015-07-01 | 新日鐵住金株式会社 | 円形断面鋳片の連続鋳造方法 |
-
2018
- 2018-12-13 FR FR1872880A patent/FR3089833B1/fr active Active
-
2019
- 2019-12-13 WO PCT/FR2019/053056 patent/WO2020120919A1/fr not_active Ceased
- 2019-12-13 EP EP19845584.2A patent/EP3894111B1/fr active Active
- 2019-12-13 CN CN201980088440.8A patent/CN113272085B/zh active Active
- 2019-12-13 US US17/413,302 patent/US11673186B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3089833A1 (fr) | 2020-06-19 |
| CN113272085A (zh) | 2021-08-17 |
| CN113272085B (zh) | 2023-11-24 |
| US20220062975A1 (en) | 2022-03-03 |
| FR3089833B1 (fr) | 2022-05-06 |
| WO2020120919A1 (fr) | 2020-06-18 |
| EP3894111B1 (fr) | 2024-04-10 |
| US11673186B2 (en) | 2023-06-13 |
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