CA2187404A1 - Process for manufacturing a metal ingot with thixotropic properties - Google Patents
Process for manufacturing a metal ingot with thixotropic propertiesInfo
- Publication number
- CA2187404A1 CA2187404A1 CA002187404A CA2187404A CA2187404A1 CA 2187404 A1 CA2187404 A1 CA 2187404A1 CA 002187404 A CA002187404 A CA 002187404A CA 2187404 A CA2187404 A CA 2187404A CA 2187404 A1 CA2187404 A1 CA 2187404A1
- Authority
- CA
- Canada
- Prior art keywords
- stirring device
- process according
- lies
- mould
- magnetic field
- 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.)
- Abandoned
Links
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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
A process for manufacturing a metal ingot (10) with thixotropic properties in a continuous casting mould (12) is such that an electromagnetic stirring device (14) for shearing dendrites as they form extends over the whole of the solidification zone of the melt to be cast. The magnetic field generated by the stirring device (14) extends, without any zero force sites, over the whole of the cross-section of the mould. The magnetic field is adjusted such that the rate of shearing lies between 10 and 450 s -1. During the solidification process, the stirring device (14) is set to generate an oscillatory movement in a plane (E) perpendicular to the mould axis, such that the frequency of oscillation (fx, fy) of the stirring device (14) lies between 1 and 10 Hz of the stirring device and the amplitude of oscillation lies between 1 and 5 mm.
Description
Process for manufacturing a metal ingot with thixotropic properties The invention relates to a process for m~mlfacturing a metal ingot with thixotropic properties using a continuous casting mould fe~h-ring an electrom~gnetic stirring device that extends S over the whole of the soli(lific~tion zone of the melt to be cast, this in order to shear dendrites that form there and such that the magnetic field generated by the stirring device extends over the whole of the mould cross-section without fe~hlring any sites of zero field force.
10 A process of the type described above is known from the German patent publication DE-C-3006588. The known process leads to a cast structure having a fine-grained microstructure exhibiting thixotropic properties during subsequent processing. The shear forces required are, however, relatively high. Furthermore, a relatively thick dendritic edge zone is formed, which can have a detrimental effect on the subsequent processing of the ingot by forging or lS pressure diecasting the ingot in the thixotropic state.
In view of the above, it is the object of the invention to provide a process of the type mentioned at the start, by means of which and using relatively low shearing rates a fine-grained microstructure can be created practically right up to the surface of the ingot.
That object is achieved by way of the invention whereby the magnetic field is adjusted such that shearing rate lies between 10 and 450 s -I . Preferably, the .chP~ring rate lies between 10 and 180s-1 .
25 In a preferred version of the process according to the invention the stirring device is made to oscillate in a plane at right angles to the mould axis during the casting process.
The stirring device according to the invention leads to a continuous change in magnetic field which increases or decreases continuously at each location in the liquid metal.
In one useful version of the process according to the invention the oscillating movement takes place in two axial directions perpendicular to each other.
The frequency of oscillation of the s~ring device lies between 1 and 10 Hz, the amplitude of 35 oscillation between 1 and 5 mm.
case 2077 02 -2- 21 8740~
If the stirring device is set to oscillate in both axial directions at the same time, then the ratio of the frequencies and/or the amplitudes of both superimposed oscillatory movements preferably lies between 1:1 and 3:1.
S The process according to the invention is not limited to producing a metal ingot of a par-dcular material. Preferred m~teri~l~, however, are ~hlminillm, m~gnPcillm, copper, steel and their alloys; excellent results can be obtained in particular with aluminium and m~gnPcillm alloys which may also be rei~orced with fibres or particles.
10 Known multi-phase stators with two or more poled induction motors may be employed to create a rotating magnetic field.
The process according to the invention is preferably employed for producing metal ingots of round cross-section on a horizontal or vertical continuous casdng unit. It is, however, also 15 conceivable to employ the process according to the invention for m~nuf~cturing metal ingots of different cross-section e.g. of rectangular cross-section.
Optimising the process parameters for a particular alloy system is done simply by means of routine trials.
Further adv~nt~ges, features and details of the invention are revealed in the following description of preferred exemplified embodiments of the invention and with the aid of the drawing showing sch~m~tir~lly in:
25 Fig. 1 the flow rate field in the molten metal over the cross-section of the ingot;
Fig. 2 the flow rate and the shear rate in the metal melt as a function of the distance from the ingot axis;
0 Fig. 3 examples of Lissajous figures from superimposed oscillatory movements of the direction of stirring;
Fig. 4 a cross-section through a stirring device perpendicular to the ingot axis;
35 Fig. S the position of the oscillation planes with reference to the axis of casting.
case 2077.02 ~3~ 21 8740~
A horizontal continuous casting unit - not shown in detail here - comprises, as shown in figures 4 and 5, a continuous casting mould 12 in which molten metal solidifies to form an ingot 10. Arranged concentric with and around the axis z of the mould or ingot, or the direction of casting, is a stirring device 14 which extends over the whole solidification zone S of the melt to be cast.
Using a known oscillation facility 16 the stirring device 14 can be set to generate an oscillating movement with a frequency f~y in both main axis directions x, y in a plane E
perpendicular to the ingot axis z. When the oscillatory movements of the stirring device 14 10 overlap in both axial directions, each location having a defined inductive magnetic field in the molten metal describes a figure which is dependent on the ratio f~: fy of the oscillation frequencies. In this respect a circular figure is particularly advantageous. Examples of these so called Lissajous figures are shown in figure 3.
15 The data in figure 2 refer to a metal ingot 10 with a diameter of 130 mm.
Especially from figures 1 and 3 it can be seen that the present invention results in a rotating, non-constant magnetic field without any zero value sites over the whole of the ingot cross-section.
case 2077.02
10 A process of the type described above is known from the German patent publication DE-C-3006588. The known process leads to a cast structure having a fine-grained microstructure exhibiting thixotropic properties during subsequent processing. The shear forces required are, however, relatively high. Furthermore, a relatively thick dendritic edge zone is formed, which can have a detrimental effect on the subsequent processing of the ingot by forging or lS pressure diecasting the ingot in the thixotropic state.
In view of the above, it is the object of the invention to provide a process of the type mentioned at the start, by means of which and using relatively low shearing rates a fine-grained microstructure can be created practically right up to the surface of the ingot.
That object is achieved by way of the invention whereby the magnetic field is adjusted such that shearing rate lies between 10 and 450 s -I . Preferably, the .chP~ring rate lies between 10 and 180s-1 .
25 In a preferred version of the process according to the invention the stirring device is made to oscillate in a plane at right angles to the mould axis during the casting process.
The stirring device according to the invention leads to a continuous change in magnetic field which increases or decreases continuously at each location in the liquid metal.
In one useful version of the process according to the invention the oscillating movement takes place in two axial directions perpendicular to each other.
The frequency of oscillation of the s~ring device lies between 1 and 10 Hz, the amplitude of 35 oscillation between 1 and 5 mm.
case 2077 02 -2- 21 8740~
If the stirring device is set to oscillate in both axial directions at the same time, then the ratio of the frequencies and/or the amplitudes of both superimposed oscillatory movements preferably lies between 1:1 and 3:1.
S The process according to the invention is not limited to producing a metal ingot of a par-dcular material. Preferred m~teri~l~, however, are ~hlminillm, m~gnPcillm, copper, steel and their alloys; excellent results can be obtained in particular with aluminium and m~gnPcillm alloys which may also be rei~orced with fibres or particles.
10 Known multi-phase stators with two or more poled induction motors may be employed to create a rotating magnetic field.
The process according to the invention is preferably employed for producing metal ingots of round cross-section on a horizontal or vertical continuous casdng unit. It is, however, also 15 conceivable to employ the process according to the invention for m~nuf~cturing metal ingots of different cross-section e.g. of rectangular cross-section.
Optimising the process parameters for a particular alloy system is done simply by means of routine trials.
Further adv~nt~ges, features and details of the invention are revealed in the following description of preferred exemplified embodiments of the invention and with the aid of the drawing showing sch~m~tir~lly in:
25 Fig. 1 the flow rate field in the molten metal over the cross-section of the ingot;
Fig. 2 the flow rate and the shear rate in the metal melt as a function of the distance from the ingot axis;
0 Fig. 3 examples of Lissajous figures from superimposed oscillatory movements of the direction of stirring;
Fig. 4 a cross-section through a stirring device perpendicular to the ingot axis;
35 Fig. S the position of the oscillation planes with reference to the axis of casting.
case 2077.02 ~3~ 21 8740~
A horizontal continuous casting unit - not shown in detail here - comprises, as shown in figures 4 and 5, a continuous casting mould 12 in which molten metal solidifies to form an ingot 10. Arranged concentric with and around the axis z of the mould or ingot, or the direction of casting, is a stirring device 14 which extends over the whole solidification zone S of the melt to be cast.
Using a known oscillation facility 16 the stirring device 14 can be set to generate an oscillating movement with a frequency f~y in both main axis directions x, y in a plane E
perpendicular to the ingot axis z. When the oscillatory movements of the stirring device 14 10 overlap in both axial directions, each location having a defined inductive magnetic field in the molten metal describes a figure which is dependent on the ratio f~: fy of the oscillation frequencies. In this respect a circular figure is particularly advantageous. Examples of these so called Lissajous figures are shown in figure 3.
15 The data in figure 2 refer to a metal ingot 10 with a diameter of 130 mm.
Especially from figures 1 and 3 it can be seen that the present invention results in a rotating, non-constant magnetic field without any zero value sites over the whole of the ingot cross-section.
case 2077.02
Claims (8)
1. Process for manufacturing a metal ingot (10) with thixotropic properties using a continuous casting mould (12) featuring an electromagnetic stirring device (14) that extends over the whole of the solidification zone of the melt to be cast, this in order to shear dendrites that form there and such that the magnetic field generated by the stirring device extends over the whole of the mould cross-section without featuring any sites of zero field force, characterised in that, the magnetic field is adjusted such that shearing rate lies between 10 and 450 s -1.
2. Process according to claim 1, characterised in that the shearing rate lies between 10 and 180 s -1.
3. Process according to claim 1 or 2, characterised in that during casting the stirring device (14) is set to generate an oscillatory movement in a plane (E) perpendicular to the mould axis (z).
4. Process according to claim 3, characterised in that the oscillatory movement takes place in two axial directions (x, y) that are perpendicular to each other.
5. Process according to claim 3 or 4, characterised in that the frequency of oscillation (fx, fy) of the stirring device (14) lies between 1 and 10 Hz.
6. Process according to claim 3 to 5, characterised in that the amplitude of oscillation of the stirring device (14) lies between 1 and 5 mm.
7. Process according to one of the claims 3 to 6, characterised in that the ratio fx : fy of the frequencies and/or the amplitudes of both superimposed oscillatory movements in both axial directions (x, y) lies between 1.1 and 3:1.
8. Use of the process according to one of the claims 1 to 7 for manufacturing a metal ingot out of aluminium or magnesium alloys that may, if desired, be reinforced with fibres or particles.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH2892/95 | 1995-10-12 | ||
| CH289295 | 1995-10-12 | ||
| CH297595 | 1995-10-20 | ||
| CH2975/95 | 1995-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2187404A1 true CA2187404A1 (en) | 1997-04-13 |
Family
ID=25691659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002187404A Abandoned CA2187404A1 (en) | 1995-10-12 | 1996-10-08 | Process for manufacturing a metal ingot with thixotropic properties |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0768132A1 (en) |
| AU (1) | AU6568196A (en) |
| CA (1) | CA2187404A1 (en) |
| CZ (1) | CZ290696A3 (en) |
| HU (1) | HUP9602694A2 (en) |
| IS (1) | IS4369A (en) |
| NO (1) | NO964301L (en) |
| SK (1) | SK127296A3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735104A (en) * | 2016-12-05 | 2017-05-31 | 东北大学 | A kind of spin orientation device under magnetic field |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6435263B2 (en) * | 1998-03-31 | 2002-08-20 | Honda Giken Kogyo Kabushiki Kaisha | Agitated continuous casting process for aluminum alloy |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8001284L (en) * | 1979-02-26 | 1980-08-27 | Itt | SET AND DEVICE FOR PREPARING TIXOTROP METAL SLUSES |
| FR2465535A1 (en) * | 1979-07-12 | 1981-03-27 | Cem Comp Electro Mec | BREWING METHOD AND DEVICE FOR IMPROVING THE QUALITY OF CONTINUOUSLY CAST METAL |
| JPS60136845U (en) * | 1984-02-16 | 1985-09-11 | 株式会社神戸製鋼所 | Mold for electromagnetic stirring of continuous casting machine |
-
1996
- 1996-09-18 AU AU65681/96A patent/AU6568196A/en not_active Abandoned
- 1996-09-27 EP EP96810637A patent/EP0768132A1/en not_active Withdrawn
- 1996-09-30 HU HU9602694A patent/HUP9602694A2/en unknown
- 1996-10-02 IS IS4369A patent/IS4369A/en unknown
- 1996-10-03 CZ CZ962906A patent/CZ290696A3/en unknown
- 1996-10-04 SK SK1272-96A patent/SK127296A3/en unknown
- 1996-10-08 CA CA002187404A patent/CA2187404A1/en not_active Abandoned
- 1996-10-10 NO NO964301A patent/NO964301L/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735104A (en) * | 2016-12-05 | 2017-05-31 | 东北大学 | A kind of spin orientation device under magnetic field |
| CN106735104B (en) * | 2016-12-05 | 2018-10-23 | 东北大学 | A kind of spin orientation device under magnetic field |
Also Published As
| Publication number | Publication date |
|---|---|
| NO964301L (en) | 1997-04-14 |
| SK127296A3 (en) | 1998-01-14 |
| HUP9602694A2 (en) | 1997-05-28 |
| AU6568196A (en) | 1997-04-17 |
| IS4369A (en) | 1997-04-13 |
| EP0768132A1 (en) | 1997-04-16 |
| NO964301D0 (en) | 1996-10-10 |
| CZ290696A3 (en) | 1997-04-16 |
| HU9602694D0 (en) | 1996-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20001010 |