CN103658609A - Method for composite refined metal solidification structure through pulse currents and liquid pulse magneto oscillation - Google Patents
Method for composite refined metal solidification structure through pulse currents and liquid pulse magneto oscillation Download PDFInfo
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- CN103658609A CN103658609A CN201310655329.7A CN201310655329A CN103658609A CN 103658609 A CN103658609 A CN 103658609A CN 201310655329 A CN201310655329 A CN 201310655329A CN 103658609 A CN103658609 A CN 103658609A
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Abstract
The invention belongs to the technical field of metal solidification structure refining, and relates to a method for a composite refined metal solidification structure through pulse currents and liquid pulse magneto oscillation. According to the method, two electrodes are embedded into the two sides of the wall of a cast in parallel, and the electrodes and the cast are isolated; after metal melt is poured into the cast, a non-contact multi-layer coil is arranged above a metal liquid surface, and pulse current and pulse magneto liquid oscillation composite processing is carried out. Processing parameters include that the peak of the pulse currents ranges from 10A to 30000A, the pulse width ranges from 10 microseconds to 100 milliseconds, and the pulse frequency ranges from 0.01Hz to 4KHz. The pulse currents stimulate melt nucleation and then form crystalline rain to refine the solidification structure. After composite liquid surface pulse magneto oscillation processing, a nucleation area is increased, and a better refining effect is obtained. The method is low in device price, simple and safe to operate and capable of being used for die cast metal solidification structure refining, and is better in grain refining effect compared with methods only using pulse currents or liquid surface pulse magneto oscillation.
Description
Technical field
The invention belongs to grain refinement technology field, relate to a kind of pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method.
Background technology
The people such as the pulse magneto vibration solidifying fine crystal technology Shi You Zhai Qi of Shanghai University outstanding person, Gong Yongyong propose.Pulse magneto oscillation technology utilizes the Kelvin effect of pulse current, applies pulsed magnetic field, and induce pulse current in bath surface on metal bath surface.At bath surface, the interaction of pulse electromagnetic field can produce pulse-electromagnetic force.Pulse-electromagnetic force causes the strong vibration on melt top layer, and the nucleus that utilizes the mechanical oscillation that thereupon produce that type wall place is produced constantly generates, comes off, the crystallization rain phenomenon of namely vibrating and causing in melt inside.Pulse current is that the another kind of pulse electromagnetic field applies mode, and the metal freezing under pulse current effect has become the domestic and international study hotspot that solidifies science and technical field of new material preparation both at home and abroad.
Due to the increase of ingot casting size in recent years, single pulse magneto oscillation technology and pulse current technology are when the solidified structure of refinement large-sized casting ingot, and power parameter is increasing, and power consumption also increases thereupon.Pulse current and liquid level pulse magneto vibration composite refining metal solidification texture can address this problem.Forming core region when technique passes through to increase metal freezing, reaches the effect that reduces energy consumption.
Summary of the invention
The object of this invention is to provide a kind of pulse current and liquid level pulse magneto vibration Combined Processing thinning metal solidification texture, solved problems of the prior art.
Because pulse current is by exciting melt forming core, thereby form crystallization rain, carry out thinning metal solidification texture, but liquid level place there is no nucleus to form.After adding the vibration of liquid level pulse magneto, can make forming core region increase, better thinning metal solidification texture.As calculated, the present invention can be by processing region area change 4-16 doubly.
The present invention, by two electrodes being embedded in to both sides on the casting mold of metal freezing shaping use, places the multimodal layer line circle of another noncontact above casting mold liquid level, makes pulse current and the vibration of liquid level pulse magneto can act on respectively melt inner and surperficial.The present invention can all produce potent electromagnetic force vibration in melt inside and liquid level place, impels at liquid level place and type wall place and produces nucleus simultaneously, has increased forming core region; Thereby and the formation of can shake easily broken dendrite and the type wall nucleus that shakes promotion " crystallization rain ", fully thinning metal solidification texture.
Pulse current and a liquid level pulse magneto vibration composite refining metal solidification texture method, the method has following technical process: by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulation; After metal bath is poured in casting mold, contactless lattice coil is placed in to metal bath surface top, carries out pulse current and pulse magneto liquid level vibration Combined Processing.
Described pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method, during metal freezing, the device that applies electromagnetic field to metal bath has two, and one is inner at metal bath, and another is outside at metal bath.
Described pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method, the parameter of pulse current and liquid level pulse magneto vibration composite refining metal solidification texture is: pulse current peak 10 ~ 30000A, pulse width is 10 μ s ~ 100ms; Pulse frequency is: 0.01Hz ~ 4KHz.
Described pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method, the electrode cross dimensions of pulse current and liquid level pulse magneto vibration Combined Processing is 5 ~ 4 * 10
4mm
2.The contactless lattice coil number of turn is 3 ~ 100, and the number of plies is 1 ~ 3 layer.Contactless lattice coil is 1mm～200mm apart from metal bath free surface height.
When the vibration of pulse current and liquid level pulse magneto is carried out Combined Processing to metal bath, contactless lattice coil and electrode can adopt three kinds of connected modes, are respectively contactless lattice coil in parallel with electrode, are then connected with a pulse power; Contactless lattice coil is connected with electrode, is then connected with a pulse power; Contactless lattice coil is connected respectively a pulse power with electrode.When two kinds of technology of liquid level pulse magneto oscillation technology and pulse current are processed metal bath, useful effect region there is no boundary, thus for the connected mode of contactless lattice coil and electrode from being identical in essence.
The invention has the beneficial effects as follows:
(1) pulse current and liquid level pulse magneto vibration composite refining metal solidification texture technology, with single pulse current, single liquid level pulse magneto oscillating phase ratio, can all produce potent electromagnetic force vibration in melt inside and liquid level place, impel at liquid level place and type wall place and produce nucleus simultaneously, increased forming core region, when effectively processing area can be compared with Sing plus electric current and liquid level pulse magneto oscillation treatment, increase 4-16 doubly, metal solidification texture obtains thinning effect.
(2) equipment price of the present invention is cheap, and safety simple to operate can be used for the refinement of molded metal solidified structure and controls, and easy accessibility.
Accompanying drawing explanation
Fig. 1 is that contactless lattice coil is connected with electrode, is then connected pulse current and liquid level pulse magneto vibration combination thinning metal solidification texture schematic diagram with a pulse power.
Label wherein: 1 is contactless lattice coil, and 2 is electrode, and 3 is metal bath, and 4 is casting mold.
Fig. 2 is that contactless lattice coil is in parallel with electrode, is then connected pulse current and liquid level pulse magneto vibration combination thinning metal solidification texture schematic diagram with a pulse power.
Fig. 3 is that contactless lattice coil is connected respectively a pulse power with electrode, pulse current and liquid level pulse magneto vibration combination thinning metal solidification texture schematic diagram.
Fig. 4 is pulse current and liquid level pulse magneto vibration Combined Processing thinning metal solidification texture design sketch.Wherein a is blank contrast, and b processes for singly applying pulse current, and c processes for singly applying the vibration of liquid level pulse magneto, and d is pulse current and liquid level pulse magneto vibration Combined Processing.
The specific embodiment
Below in conjunction with embodiment, the invention will be further elaborated; Embodiment is only for the present invention is described, rather than limits by any way the present invention.
embodiment 1
The solidified structure of commercial-purity aluminium in sand mold (99.7%) is processed in pulse current and the vibration of liquid level pulse magneto simultaneously
Experimentation is as follows: experiment material is the commercial-purity aluminium of purity 99.7%, and casting mold is sand mold, and the contactless lattice coil number of turn is 14, and the number of plies is 1; Electrode cross dimensions is 100mm
2.In the whole metal freezing stage, carry out pulse magneto liquid level vibration and pulse current is processed simultaneously.Specific embodiment is as follows:
1. by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulate.(as shown in Figure 1)
2. sand mold is preheated to 443K.
3. the metal bath that by the degree of superheat is 25 ℃ injects and contactless lattice coil is placed in after sand mold to 2.5cm place, metal bath surface top by the mode of top casting.
4. open power supply and carry out pulse current and pulse magneto liquid level vibration Combined Processing.Wherein, contactless lattice coil and electrode are series circuit, current peak 200A, electric current pulsewidth 8ms, effect frequency 100Hz.
6. after solidifying completely, cut off the electricity supply, stop Combined Processing.
Result shows, undressed blank ingot column crystal ratio reaches 85%, and coarse grains, as Fig. 4 a; Utilize after pulse current processing or liquid level pulse magneto oscillation treatment, proportion of equiaxed grain can reach respectively 50% and 70%, and metal solidification texture obtains refinement.After two kinds of modes are processed, crystallite dimension is respectively 500 μ m and 200 μ m.As shown in Fig. 4 b, 4c; Utilize after pulse current and liquid level pulse magneto vibration Combined Processing, proportion of equiaxed grain can reach 80%, the more above-mentioned two kinds of methods of metal solidification texture, and thinning effect is more remarkable, and crystallite dimension can reach below 50 μ m, as shown in Fig. 4 d.
embodiment 2
The solidified structure of sand mold middle (center) bearing steel is processed in pulse current and the vibration of liquid level pulse magneto simultaneously
Experimentation is as follows: experiment material bearing steel, and casting mold is sand mold, and the contactless lattice coil number of turn is 24, and the number of plies is 2; Electrode cross dimensions is 1 * 10
3mm
2.In the whole metal freezing stage, carry out pulse magneto liquid level vibration and pulse current is processed simultaneously.Specific embodiment is as follows:
1. by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulate.(as shown in Figure 1)
2. sand mold is preheated to 943K.
4. the metal bath that by the degree of superheat is 50 ℃ injects and contactless lattice coil is placed in after sand mold to 3cm place, metal bath surface top by the mode of top casting.
5. open power supply and carry out pulse current and pulse magneto liquid level vibration Combined Processing.Wherein, contactless lattice coil and electrode are series circuit, current peak 10000A, electric current pulsewidth 400 μ s, effect frequency 1500Hz.
6. after solidifying completely, cut off the electricity supply, stop Combined Processing.
The solidified structure of commercial-purity aluminium in sand mold (99.7%) is processed in pulse current and the vibration of liquid level pulse magneto simultaneously
Experimentation is as follows: experiment material is the commercial-purity aluminium of purity 99.7%, and casting mold is sand mold, and the contactless lattice coil number of turn is 18, and the number of plies is 1; Electrode cross dimensions is 70mm
2.In the whole metal freezing stage, carry out pulse magneto liquid level vibration and pulse current is processed simultaneously.Specific embodiment is as follows:
1.. by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulation.(as shown in Figure 2)
2. sand mold is preheated to 443K.
3. the metal bath that by the degree of superheat is 25 ℃ injects and contactless lattice coil is placed in after sand mold to 2.5cm place, metal bath surface top by the mode of top casting.
4. open power supply and carry out pulse current and pulse magneto liquid level vibration Combined Processing.Wherein, contactless lattice coil and electrode are parallel circuit, current peak 100A, electric current pulsewidth 50 μ s, effect frequency 3900Hz.
6. after solidifying completely, cut off the electricity supply, stop Combined Processing.
embodiment 4
The solidified structure of sand mold middle (center) bearing steel is processed in pulse current and the vibration of liquid level pulse magneto simultaneously
Experimentation is as follows: experiment material bearing steel, and casting mold is sand mold, and the contactless lattice coil number of turn is 24, and the number of plies is 2; Electrode cross dimensions is 1 * 10
3mm
2.In the whole metal freezing stage, carry out the vibration of liquid level pulse magneto processes with pulse current simultaneously.Specific embodiment is as follows:
1.. by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulation.(as shown in Figure 2)
2. sand mold is preheated to 943K.
4. the metal bath that by the degree of superheat is 50 ℃ injects and contactless lattice coil is placed in after sand mold to 3cm place, metal bath surface top by the mode of top casting.
5. open power supply and carry out pulse current and pulse magneto liquid level vibration Combined Processing.Wherein, contactless lattice coil and electrode are parallel circuit, current peak 10000A, electric current pulsewidth 15ms, effect frequency 20Hz.
6. after solidifying completely, cut off the electricity supply, stop Combined Processing.
embodiment 5
The solidified structure of ferritic stainless steel in sand mold is processed in pulse current and the vibration of liquid level pulse magneto simultaneously
Experimentation is as follows: experiment material super-purity ferrite stainless steel, and casting mold is sand mold, and the contactless lattice coil number of turn is 30, and the number of plies is 3; Electrode cross dimensions is 5 * 10
4mm
2.In the whole metal freezing stage, carry out pulse magneto liquid level vibration and pulse current is processed simultaneously.Specific embodiment is as follows:
1.. by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulation.(as shown in Figure 3)
2. sand mold is preheated to 1043K.
4. the metal bath that by the degree of superheat is 60 ℃ injects and contactless lattice coil is placed in after sand mold to 5cm place, metal bath surface top by the mode of top casting.
5. open power supply and carry out pulse current and pulse magneto liquid level vibration Combined Processing.Wherein, contactless lattice coil and electrode are powered respectively with two power supplys, current peak 18000A, electric current pulsewidth 600 μ s, effect frequency 20Hz.
6. after solidifying completely, cut off the electricity supply, stop Combined Processing.
embodiment 6
The solidified structure of ferritic stainless steel in sand mold is processed in pulse current and the vibration of liquid level pulse magneto simultaneously
Experimentation is as follows: experiment material super-purity ferrite stainless steel, and casting mold is sand mold, and the contactless lattice coil number of turn is 12, and the number of plies is 1; Electrode cross dimensions is 30mm
2.In the whole metal freezing stage, carry out pulse magneto liquid level vibration and pulse current is processed simultaneously.Specific embodiment is as follows:
1. by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulate.(as shown in Figure 3)
2. sand mold is preheated to 1043K.
4. the metal bath that by the degree of superheat is 60 ℃ injects and contactless lattice coil is placed in after sand mold to 0.5cm place, metal bath surface top by the mode of top casting.
5. open power supply and carry out pulse current and pulse magneto liquid level vibration Combined Processing.Wherein, contactless lattice coil and electrode are powered respectively with two power supplys, current peak 8000A, electric current pulsewidth 50 μ s, effect frequency 1900Hz.
6. after solidifying completely, cut off the electricity supply, stop Combined Processing.
Claims (11)
1. pulse current and a liquid level pulse magneto vibration composite refining metal solidification texture method, is characterized in that the method has following technical process: by the type wall both sides of two parallel embedding casting molds of electrode, electrode and casting mold insulate; After metal bath is poured in casting mold, contactless lattice coil is placed in to metal bath surface top, carries out pulse current and pulse magneto liquid level vibration Combined Processing.
2. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, it is characterized in that: during metal freezing, the device that applies electromagnetic field to metal bath has two, and one is inner at metal bath, and another is outside at metal bath.
3. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, it is characterized in that: the contactless lattice coil of liquid level pulse magneto vibration is that contactless lattice coil is in parallel with electrode with the connected mode of electrode, is then connected with a pulse power.
4. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, it is characterized in that: the contactless lattice coil of liquid level pulse magneto vibration is that contactless lattice coil is connected with electrode with the connected mode of electrode, is then connected with a pulse power.
5. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, is characterized in that: the contactless lattice coil of liquid level pulse magneto vibration is that contactless lattice coil is connected respectively a pulse power with electrode with the connected mode of electrode.
6. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, is characterized in that: the electrode cross dimensions of pulse current and liquid level pulse magneto vibration Combined Processing is 5 ~ 4 * 10
4mm
2.
7. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, is characterized in that: the contactless lattice coil number of turn is 3 ~ 100, and the number of plies is 1 ~ 3 layer.
8. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, is characterized in that: the current peak of pulse current and liquid level pulse magneto vibration Combined Processing is 10 ~ 30000A.
9. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, is characterized in that: the pulse width of pulse current and liquid level pulse magneto vibration Combined Processing is 10 μ s ~ 100ms.
10. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture method as claimed in claim 1, is characterized in that: the pulse frequency of pulse current and liquid level pulse magneto vibration Combined Processing is 0.01Hz ~ 4KHz.
11. pulse current and liquid level pulse magneto vibration composite refining metal solidification texture methods as claimed in claim 1, is characterized in that: contactless lattice coil is 1mm～200mm apart from metal bath free surface height.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949616A (en) * | 2014-04-14 | 2014-07-30 | 上海大学 | Device for measuring temperature of melt in pulse magnetostrictive liquid level oscillating process |
| CN103994836A (en) * | 2014-05-19 | 2014-08-20 | 上海大学 | Device for measuring melt heat history curve under action of pulse magnetic liquid level oscillation |
| CN104128592A (en) * | 2014-08-14 | 2014-11-05 | 昆明理工大学 | Device for refining metal solidification structure with electric current pulses |
| CN104399951A (en) * | 2014-09-03 | 2015-03-11 | 上海大学 | Method for carrying out composite refining on metal solidification structure by pulse magnetic oscillation and refiners |
| CN110729987A (en) * | 2019-11-06 | 2020-01-24 | 上海电机学院 | Steep front square wave pulse magnetic field power supply for thinning solidified tissue and control method thereof |
| WO2021255023A1 (en) * | 2020-06-18 | 2021-12-23 | Voestalpine Additive Manufacturing Center Gmbh | Actuator for a casting mold for producing metal components |
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| CN102179505A (en) * | 2011-04-15 | 2011-09-14 | 江苏大学 | Method for refining metal solidification structure by using pulsed magnet field and pulse current with same frequency |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949616A (en) * | 2014-04-14 | 2014-07-30 | 上海大学 | Device for measuring temperature of melt in pulse magnetostrictive liquid level oscillating process |
| CN103994836A (en) * | 2014-05-19 | 2014-08-20 | 上海大学 | Device for measuring melt heat history curve under action of pulse magnetic liquid level oscillation |
| CN104128592A (en) * | 2014-08-14 | 2014-11-05 | 昆明理工大学 | Device for refining metal solidification structure with electric current pulses |
| CN104399951A (en) * | 2014-09-03 | 2015-03-11 | 上海大学 | Method for carrying out composite refining on metal solidification structure by pulse magnetic oscillation and refiners |
| CN110729987A (en) * | 2019-11-06 | 2020-01-24 | 上海电机学院 | Steep front square wave pulse magnetic field power supply for thinning solidified tissue and control method thereof |
| WO2021255023A1 (en) * | 2020-06-18 | 2021-12-23 | Voestalpine Additive Manufacturing Center Gmbh | Actuator for a casting mold for producing metal components |
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Application publication date: 20140326 |