CN103949631B - The device of melt temperature in pulsed current measurement liquid surface fluctuation solidifying fine crystal technique - Google Patents
The device of melt temperature in pulsed current measurement liquid surface fluctuation solidifying fine crystal technique Download PDFInfo
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- CN103949631B CN103949631B CN201410147684.8A CN201410147684A CN103949631B CN 103949631 B CN103949631 B CN 103949631B CN 201410147684 A CN201410147684 A CN 201410147684A CN 103949631 B CN103949631 B CN 103949631B
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Abstract
The invention discloses a kind of device of melt temperature in pulsed current measurement liquid surface fluctuation solidifying fine crystal technique, including casting system, pulse current liquid surface fluctuation application system and temperature test analysis system etc.；Casting system is made up of spring shape induction coil and intermediate frequency alternating source, and intermediate frequency alternating source controls spring shape induction coil to produce alternating magnetic field through switching device, the metal derby in casting mold is generated vortex and is melted；Pulse current liquid surface fluctuation application system is made up of parallel pole and the pulse power, the pulse power controls parallel pole by switching device, apply the processing of pulse current liquid surface fluctuation to melt, it is in parallel pole and thermocouple insertion melt and fixed, the temperature information of metal bath is continuously recorded by Temperature-collection Recorder.Compared to traditional temp measuring method, present invention eliminates casting process, can more stablize, measure melt temperature curve exactly, and reliable temperature data is provided for solidifying microlite by impulse current liquid surface disturbance technique.
Description
Technical field
The invention belongs to materials processing technology field, is related specifically to a kind of pulsed current measurement liquid surface fluctuation solidifying fine crystal
The device of melt temperature in technique.
Background technology
In modern society, most metal parts are all that blank or ingot are process made of casting, although
The tissue of metal can largely be changed in reprocessing afterwards and then optimize its performance, but metal is in process of setting
The tissue signature of formation still influences huge on following process and final material property, therefore thinning metal solidification texture turns into
Study hotspot in Material Field, receives extensive concern both domestic and external.In existing research, mainly there are two class refinement sides
Method：First, physical thinning method, such as cast cold, electromagnetic agitation, mechanical oscillation, ultrasonic wave refinement；Second, superalloy method, such as
Addition nucleating agent and inhibitor etc. of growing up.Wherein physical field treatment technology has the advantages of environmental protection, economic and development potentiality is big, because
And rivet the attention from all fields.Have now been found that, apply impulse electric field in the process of setting of metal, can significantly crystal grain thinning, improvement
Solidified structure, the research of this respect have become the focus in field.
In the technology of existing external field treatment metal solidification texture, Chinese patent 200710044164.4 discloses a kind of " arteries and veins
Rush electric current liquid surface fluctuation solidifying fine crystal method ", the inventive method will be cast into casting mold after metal molten and overheat, by two parallel electricity
Pole is inserted below metal bath surface above melt, is carried out pulse current liquid surface fluctuation processing to metal bath, is finally made metal casting
The tissue of ingot is refined.This method operation is very easy, and thinning effect is notable.In commercial Application, this method can be used for
Molding, continuous casting in metallurgical industry, the structure refinement of suitable various metal materials, application prospect are very optimistic.And in order to
Further probe into the essential mechanism of the fine grain method, temperature curve meaning when the lower melt of accurate measurement fine grain method effect solidifies
Justice is great, but the device in the patent is in specific implementation process, is to melt metal derby by resistance furnace and be incubated a timing
Between, then by pouring metal melt into casting mold, and molten metal is fetched into this period of cast from resistance furnace, molten metal is in sky
Largely radiated in gas, its temperature has decreased when causing to pour into casting mold；And the height of cast gate, position and liquid metal filling
Mode equally has a significant impact to the Temperature Distribution in melt, and these means are difficult to holding one during each cast
Cause；In addition, thermocouple is inserted in traditional temp measuring method mainly two kinds of means：First, punched from casting mold side wall in advance by thermocouple
Level embedment, is the drawbacks of this method：For melt when being just poured into casting mold, flowing is violent, and temperature fluctuation is very big, cooling
Speed is very fast, therefore its temperature measured has larger error, and the danger that melt leaks from thermocouple jack be present.Two
Be it is to be cast after the completion of thermocouple is inserted in melt again, and after molten metal pours into temperature relatively low casting mold, at type wall
Solidification shell can be quickly formed, and the thermocouple being inserted into also can produce certain chilling action to the melt of region, this two
Factor has larger deviation when causing measured temperature just to be completed compared to cast.In summary, using the device in the patent
The more difficult accurate temperature for obtaining melt in solidifying microlite by impulse current liquid surface disturbance technique.And the device of this patent overcomes this
A little problems, the temperature curve in solidifying microlite by impulse current liquid surface disturbance technique inside melt can be accurately measured, to probe into the party
The essential mechanism of method provides accurate temperature data.
The content of the invention
In view of the deficiencies of the prior art, it is an object of the invention to provide a kind of solidification of pulsed current measurement liquid surface fluctuation
The device of melt temperature in fine grain technique, measurement apparatus is simple and easy to do, and data measured is accurately and reliably.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
The invention mainly comprises:Temperature test analysis system, the temperature test analysis system by thermocouple, thermocouple and
Electrode fixuture and Temperature-collection Recorder are formed, and the signal receiving end of the Temperature-collection Recorder connects the thermoelectricity
Even signal output part, to monitor the temperature of test point inside metal bath to be measured, and output temperature metrical information in real time, its
It is characterised by：Also include casting system and pulse current liquid surface fluctuation application system, the casting system is by intermediate frequency alternating source
Formed with spring shape induction coil, the casting mold for filling metal derby is located inside spring shape induction coil, casting mold and the spring shape
Heat-insulating material overcoat is equipped between induction coil, the suitable for reading of the spring shape induction coil is provided with thermocouple and electrode fixuture,
The hole slot structure for installing the thermocouple and parallel pole is provided with the thermocouple and electrode fixuture, is easy to thermocouple to consolidate
It is scheduled on wherein, the thermocouple comprises at least one, and the intermediate frequency alternating source controls the spring shape sense by switching system
Answer coil to produce alternating magnetic field, generate vortex in the metal derby being loaded into the casting mold system, make its exothermic melting, institute
State pulse current liquid surface fluctuation application system to be made up of the pulse power and parallel pole, the parallel pole is disposed through spring shape
Thermocouple and electrode fixuture on induction coil and the fixed position inserted in melt, the pulse power pass through switching device
The parallel pole is controlled, the processing of pulse current liquid surface fluctuation is applied to the metal bath being loaded into the casting mold, passes through institute
State Temperature-collection Recorder and be successively recorded in temperature in solidifying microlite by impulse current liquid surface disturbance technique inside metal bath
Information, and draw the temperature-time curve of metal bath tested point.
The switching device of the switching system of above-mentioned casting system and the pulse current liquid surface fluctuation application system is integrated in
Together, using double-point double-throw switch, i.e., the switching system of described casting system and the pulse current liquid surface fluctuation application system
A double-point double-throw switch is shared, the spring shape induction coil is handed over via the left binding post of double-point double-throw switch and intermediate frequency
Variable power source electrically connects, and a parallel pole electrically connects via the right binding post of double-point double-throw switch with the pulse power, Ling Yigen
Parallel pole directly electrically connects with the pulse power, is switched by the left and right of double-point double-throw switch handle, can realize fusing respectively
Metal derby and the effect for applying the processing of pulse current liquid surface fluctuation to metal bath.
The running parameter of the above-mentioned pulse power is：Pulse current is 10-5000A, and pulse width is 5 μ s-50ms, effect
Frequency is 0.01-2.5KHz；The running parameter of above-mentioned intermediate frequency alternating source is：Electric current is 0.1-100A, and acting frequency is
500—1000Hz。
The above-mentioned thermocouple and electrode fixuture being placed on spring shape induction coil, consolidates the thermocouple and parallel pole
To determine and insert in melt, the temperature of tested point on thermocouple measurement metal bath axis is parallel to play a part of to import pulse current,
And the position of thermocouple and parallel pole, quantity and insertion depth difference are adjustable.
The thickness of above-mentioned heat-insulating material overcoat is preferably 2-40mm.
The material of above-mentioned heat-insulating material overcoat preferably mixes waterglass by floating bead or asbestos are formed.
Above-mentioned casting mold is preferably with graphite crucible, ceramic crucible or sand mold.
The material of above-mentioned parallel pole is preferably with fine copper or stainless steel.
The depth of above-mentioned parallel pole insertion melt liquid level is preferably 10-600mm.
By adopting the above-described technical solution, when utilizing the present invention, the plug-in strip of double-point double-throw switch is pressed into first left
Side, alternating current is imported to spring shape coil by intermediate frequency alternating source, due to the effect of electromagnetic induction, the metal derby in casting mold
Generate vortex and it is exothermic melting, thermocouple and parallel pole are then placed in spring sense by thermocouple and electrode fixuture
Answer on coil, thermocouple and parallel pole insertion melt fixed position, monitor melt axle in real time by Temperature-collection Recorder
Multi-point temp on line.When melt reaches predetermined temperature, the plug-in strip of switch is pressed into right side, by the pulse power through parallel pole
Pulse current is imported to melt, so as to apply the processing of pulse current liquid surface fluctuation to it, obtained by Temperature-collection Recorder
Accurately and reliably in pulse current liquid surface fluctuation technique on melt certain point or multiple spot temperature-time graph.
Advantages of the present invention is as follows：
1）The invention provides a kind of device of melt temperature in pulsed current measurement liquid surface fluctuation technique, cast is eliminated
Step, avoid to come out of the stove due to molten metal in experiment every time and heat is lost into casting process, and cast and liquid metal filling
Mode be difficult to the deviation of melt internal temperature caused by being consistent.So as to more accurately measure pulse current liquid surface fluctuation
Temperature curve in technique inside melt.
2）Device provided by the present invention, avoid casting mold and chilling action caused by molten metal, and thermocouple are being poured
Melt internal temperature deviation, overcomes tradition caused by this time difference just inserted after note and the chilling action of thermocouple
This larger shortcoming of temperature curve error that thermometry measures, so as to more accurately measure the lower gold of pulse current liquid surface fluctuation processing
Belong to the temperature curve of melt.
Brief description of the drawings
Fig. 1 is a kind of apparatus structure schematic diagram of melt temperature in pulsed current measurement liquid surface fluctuation technique.
In figure：1. thermocouple, 2. parallel poles, 3. thermocouples and electrode fixuture, 4. spring shape induction coils, 5. gold medals
Category melt, 6. casting molds, 7. heat-insulating material overcoats, 8. double-point double-throw switch, 9. intermediate frequency alternating sources, 10. pulse powers,
11. Temperature-collection Recorder.
Fig. 2 is the temperature using 2 points on fine aluminium axis under the pulse current liquid surface fluctuation PROCESS FOR TREATMENT measured by the device
Degree-time graph.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment 1
Referring to Fig. 1, the device of melt temperature in a kind of pulsed current measurement liquid surface fluctuation technique of the invention, including thermocouple
1st, parallel pole 2-1 and 2-2, thermocouple and electrode fixuture 3, spring shape induction coil 4, metal bath 5, casting mold 6, heat insulating material
Material overcoat 7, double-point double-throw switch 8, intermediate frequency alternating source 9, the pulse power 10 and Temperature-collection Recorder 11 are formed.It will fill
The casting mold 6 of metal derby is placed in heat-insulating material overcoat 7, is placed in the interior zone of spring shape induction coil 4.Spring shape induction coil
4 electrically connect via 8 left binding post of double-point double-throw switch with intermediate frequency alternating source 9, and a parallel pole 2-1 is double via double-pole
8 right binding post of throw switch electrically connects with the pulse power 10, and another parallel pole 2-2 directly electrically connects with the pulse power 10.
Used spring shape number of inductive coil turns is 11, and the number of plies 2, electrode material is stainless steel, heat-insulating material overcoat
It is made up of floating bead mixing waterglass, casting mold selects graphite crucible, and specification is 110 × Φ of Φ 70 × 105, and the work of the pulse power is joined
Number is：Pulse current is 10-5000A, and pulse width is 5 μ s-50ms, and acting frequency is 0.01-2.5KHz；Above-mentioned intermediate frequency
The running parameter of alternating source is：Electric current is 0.1-100A, and acting frequency is 500-1000Hz.
Using the present invention and its special purpose device, the experiment done for fine aluminium is completed, its experimental conditions and result narration
It is as follows：
800 grams of fine aluminium blocks are put into graphite crucible, graphite crucible is placed in outside the heat-insulating material in spring shape induction coil
In set, the plug-in strip of double-point double-throw switch is pressed into left side first, it is 20- to import size to induction coil by intermediate frequency alternating source
60A, the alternating current that frequency is 500-1000HZ, due to the effect of electromagnetic induction, the fine aluminium block in graphite crucible generates whirlpool
Stream and it is exothermic melting, then two K-type thermocouples and two parallel poles are properly inserted by thermocouple and electrode fixuture
Melt, electrode insertion level is 15mm, and monitors depth difference on melt axis in real time by Temperature-collection Recorder
2 points（Respectively apart from liquid level 3cm and 4cm）Temperature.When melt temperature is raised to 730 DEG C, the plug-in strip of switch is pressed into right
Side, it is 10K to import parameter to melt through parallel pole by the pulse poweriHz, 10hiA, 20biμs（K in this patenti、hi、bi
For device parameter, do not change with the change of experiment condition）Pulse current, so as to metal bath implement pulse current liquid level
Disturbance treatment, the real-time change of this 2 temperature is monitored by Temperature-collection Recorder, draw accurately and reliably pulse current
Temperature-time graph of lower 2 points of the melt axis of liquid surface fluctuation processing, as shown in Figure 2.
Claims (8)
- A kind of 1. device of melt temperature in pulsed current measurement liquid surface fluctuation solidifying fine crystal technique, mainly including temperature test point Analysis system, the temperature test analysis system is by thermocouple (1), thermocouple and electrode fixuture (3) and temperature acquisition record system System (11) is formed, and the signal receiving end of the Temperature-collection Recorder (11) connects the signal output part of the thermocouple (1), To monitor the temperature of the internal test point of metal bath to be measured (5), and output temperature metrical information in real time, it is characterised in that：Also Including casting system and pulse current liquid surface fluctuation application system, the casting system is by intermediate frequency alternating source (9) and spring shape Induction coil (4) is formed, and the casting mold (6) for filling metal derby is located at spring shape induction coil (4) inside, the casting mold (6) and bullet Heat-insulating material overcoat (7) is equipped between spring shape induction coil (4), the suitable for reading of the spring shape induction coil (4) is provided with thermocouple And electrode fixuture (3), it is provided with the thermocouple and electrode fixuture (3) and the thermocouple (1) and parallel pole is installed The hole slot structure of (2-1,2-2), it is easy to thermocouple (1) to be fixed therein, the thermocouple (1) comprises at least one, in described Frequency alternating source (9) controls the spring shape induction coil (4) to produce alternating magnetic field by switching system, is being loaded into the casting Vortex is generated in metal derby in type (6), makes its exothermic melting, the pulse current liquid surface fluctuation application system is by pulse electricity Source (10) and parallel pole (2-1,2-2) are formed, and the parallel pole (2-1,2-2) is disposed through spring shape induction coil (4) On thermocouple and electrode fixuture (3) and the fixed position inserted in melt, the pulse power (10) pass through switching device The parallel pole (2-1,2-2) is controlled, pulse current liquid level is applied to the metal bath (5) being loaded into the casting mold (6) Disturbance treatment, it is successively recorded in by the Temperature-collection Recorder (11) in solidifying microlite by impulse current liquid surface disturbance technique The internal temperature information of metal bath (5), and draw the temperature-time curve of metal bath (5) tested point；When melt reaches pre- When constant temperature is spent, the plug-in strip of switch is pressed into right side, pulse current is imported to melt through parallel pole by the pulse power, so as to right It applies the processing of pulse current liquid surface fluctuation, is fixed by the thermocouple being placed on spring shape induction coil (4) and electrode Part (3), the thermocouple (1) and parallel pole (2-1,2-2) is set to fix and insert in melt, thermocouple (1) measurement metal melts The temperature of tested point on body (5) axis, parallel pole (2-1,2-2) play a part of to import pulse current, and thermocouple (1) peace Position, quantity and the insertion depth of row electrode (2-1,2-2) are distinguished adjustable.
- 2. the device of melt temperature in pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to claim 1, its It is characterised by：The switching device of the switching system of the casting system and the pulse current liquid surface fluctuation application system integrates, Using double-point double-throw switch (8), i.e., the switching system of described casting system and the pulse current liquid surface fluctuation system share one The individual double-point double-throw switch (8), make the spring shape induction coil (4) via double-point double-throw switch (8) left binding post with Frequency alternating source (9) electrically connects, and a parallel pole (2-1) is via double-point double-throw switch (8) right binding post and pulse electricity Source (10) electrically connects, and another parallel pole (2-2) directly electrically connects with the pulse power (10), passes through double-point double-throw switch (8) the left and right switching of handle, fusing metal block is realized respectively and pulse current liquid surface fluctuation PROCESS FOR TREATMENT is applied to metal bath Effect.
- 3. the device of melt temperature in pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to claim 1, its It is characterised by：The running parameter of the pulse power (10) is：Pulse current is 10-5000A, pulse width be 5 μ s- 50ms, acting frequency are 0.01-2.5KHz；The running parameter of the intermediate frequency alternating source (9) is：Electric current is 0.1-100A, Acting frequency is 500-1000Hz.
- 4. melt in the pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to any one in claims 1 to 3 The device of temperature, it is characterised in that：The thickness of the heat-insulating material overcoat (7) is 2-40mm.
- 5. melt in the pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to any one in claims 1 to 3 The device of temperature, it is characterised in that：The heat-insulating material overcoat (7) mixes waterglass by floating bead or asbestos are formed.
- 6. melt in the pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to any one in claims 1 to 3 The device of temperature, it is characterised in that：The casting mold (6) uses graphite crucible, ceramic crucible or sand mold.
- 7. melt in the pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to any one in claims 1 to 3 The device of temperature, it is characterised in that：The material of the parallel pole (2-1,2-2) uses fine copper or stainless steel.
- 8. melt in the pulsed current measurement liquid surface fluctuation solidifying fine crystal technique according to any one in claims 1 to 3 The device of temperature, it is characterised in that：The depth of parallel pole (2-1,2-2) the insertion melt (5) is 10-600mm.
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| CN103949631B true CN103949631B (en) | 2017-12-22 |
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| PL149360B1 (en) * | 1985-10-31 | 1990-02-28 | Inst Odlewnictwa | Apparatus for predicing as-solidified structure of casting alloys in particular cast iron spheroidization degree |
| CN100531966C (en) * | 2004-11-26 | 2009-08-26 | 中国科学院金属研究所 | Production and apparatus for preparing non-dendritic and semi-solid alloy by low-voltage pulse electric field |
| CN1319682C (en) * | 2005-10-27 | 2007-06-06 | 上海大学 | Method and apparatus for fining metal solidified organs by using magneto-oscillation |
| CN101100705A (en) * | 2007-07-25 | 2008-01-09 | 上海大学 | Method for solidifying microlite by impulse current liquid surface disturbance |
| CN103586442B (en) * | 2013-11-20 | 2015-08-12 | 上海大学 | The device of continuously measuring discontinuous metal melt temperature in pulse magneto oscillation treatment technique |
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