CN103115938A - Method for measuring coefficient of heat transfer of solidification interface under action of alternating magnetic field - Google Patents
Method for measuring coefficient of heat transfer of solidification interface under action of alternating magnetic field Download PDFInfo
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- CN103115938A CN103115938A CN2012105740075A CN201210574007A CN103115938A CN 103115938 A CN103115938 A CN 103115938A CN 2012105740075 A CN2012105740075 A CN 2012105740075A CN 201210574007 A CN201210574007 A CN 201210574007A CN 103115938 A CN103115938 A CN 103115938A
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Abstract
The invention discloses a method for measuring a coefficient of heat transfer of a solidification interface under the action of an alternating magnetic field. The device comprises a thermocouple for measuring the temperature change of a metal melt and the temperature change of a cylindrical mould, an induction coil, a heat insulation material and a data collecting and calculating system. Through measuring the temperature change of the metal melt and the mould under the action of the alternating magnetic field generated by the induction coil and using a reverse heat transfer calculation program, the coefficient of the heat transfer of the solidification interface in the metal solidification process is obtained. The device is capable of measuring the coefficient of heat transfer of the metal interface under the action of the alternating magnetic field, and provides a basis for applying the electromagnetic field in the solidification process.
Description
Technical field
The invention belongs to metal freezing heat transfer field of measuring technique, specially refer to metal solidification process interface heat exchange coefficient determinator under a kind of action of alternating magnetic field.
Technical background
In the metal casting process, due to the good thermal conductivity of metal material, heat transfer resistance between foundry goods, mould mainly concentrates on both interfaces, and the control of process of setting interface heat exchange coefficient often becomes the controlling factor of solidification and heat transfer, and casting solidification process is played very large impact.Because the factor that affects interface heat exchange coefficient is a lot, as the interface contact condition, physical condition, electrochemical conditions and interface temperature etc., interface heat exchange coefficient is the most difficult to be obtained, how to guarantee process of setting conduct heat to guarantee its at one-dimensional square to being key factor.In modern casting process, the application of alternating magnetic field can strengthen the performance of foundry goods simultaneously, is used widely, measures under action of alternating magnetic field, and it is particularly important that the work of process of setting interface heat exchange coefficient seems.But action of alternating magnetic field produces larger deviation to the meetings such as interference of measuring system to measuring accuracy.The mensuration of accurate interface heat exchange coefficient can reflect that the melt thermodynamics that electromagnetic field causes changes, and provides new thinking for inquiring into electromagnetic field to the impact of process of setting.
In prior art, Chinese patent 201110024245.4 discloses a kind of " interface heating power coupling heat transfer coefficients measuring system and method ", this measuring method adopts surface of the work sweating heat galvanic couple, thermopair is transferred to temperature collect module with the temperature variation of test, puts to get temperature variation data acquisition interface heat exchange coefficient according to surface test.But this method is easily brought larger error to measurement owing to there is no molten steel melt internal temperature data, and this measuring method is not suitable for the measurement under alternating magnetic field simultaneously.Due to alternating magnetic field, data acquisition brings humorous wave interference to the die surface thermopair, must apply shielding measure.
Summary of the invention
For the deficiencies in the prior art part, one of purpose of the present invention is under a kind of measurement action of alternating magnetic field of design, the device of process of setting interface heat exchange coefficient, and measurement mechanism is easy to be reliable, can measure metal bath under action of alternating magnetic field, the interface heat exchange coefficient between metal bath and mould.Two of purpose of the present invention is a kind of means that the melt internal temperature can be provided of design, realizes measuring more accurately.
Technical solution:
The present invention includes: cylindrical die, first melt temperature thermocouple, second melt temperature thermocouple, cylindrical die is placed on the lower surface thermal insulation material, and cylindrical die covers the upper surface thermal insulation material, and cylindrical die is placed on the inductive coil interior zone.
The end that the present invention is placed in first melt temperature thermocouple in cylindrical die, second melt temperature thermocouple is not at grade.
The thickness of described upper surface thermal insulation material and lower surface thermal insulation material is 10-50mm.
The present invention changes by measuring metal bath and mold temperature, and the temperature data that records is delivered to data acquisition system (DAS) and computing machine, obtains interface heat exchange coefficient.Wherein, diametric near one dimensional heat transfer at it for guaranteeing cylindrical die, place thermal insulation material in the cylindrical die upper and lower surface, thickness is 10-50mm.
For temperature thermocouple, two are immersed in and measure the metal bath temperature variation in mould, and four pre-buried measures in the melt solidifying process in mould, and mold temperature changes.The thermoelectricity of wherein measuring the metal bath temperature variation on a rare occasion props up the home position that is arranged into mould, the thermopair top is 1/4 of mold height apart from mold bottom, another be arranged into apart from mould along on 1/4 position, the thermopair top is 1/2 of mold height apart from mold bottom.Be the shielding alternating magnetic field to the interference of thermopair electric signal, wrap up coated with ferrous materials at the wire of mould temperature thermocouple.The measuring-signal sample frequency of melt temperature thermocouple and mould temperature thermocouple is at 50KHz-100KHz, and its signal carries out the A/D converting transmission in computing machine by data acquisition system (DAS).
Whole mould is placed in solenoidal die cavity, alternating magnetic field occurs by solenoid, and metal bath is cooling in applying the process of alternating magnetic field, collects by data acquisition system (DAS) by the signal of thermopair collection, and through computing, obtain the melt solidifying interfacial heat transfer coefficient during.
Compared with prior art, under a kind of action of alternating magnetic field of the present invention, metal solidification process interface heat exchange coefficient determinator has following advantage:
1) metal solidification process interface heat exchange coefficient determinator under a kind of action of alternating magnetic field of the present invention, can measure the melt interface coefficient of heat transfer under action of alternating magnetic field, due to alternating magnetic field to data acquisition brings humorous wave interference to the die surface thermopair, thermopair is adopted shielding measure, guaranteed under action of alternating magnetic field the accuracy of temperature acquisition.
2) in melt mould upper and lower surface coated with certain thickness thermal insulation material, guarantee the melt solidifying process conduct heat guarantee its one-dimensional square to, namely set up the heat exchange environment of one dimension around mould.
3) the present invention utilizes the temperature acquisition of the inner thermocouple measurement unique point of melt, for the calculating of interfacial heat exchange data provides more temperature data, has guaranteed the precision that interface heat exchange coefficient calculates.
Description of drawings
Fig. 1 is metal solidification process interface heat exchange coefficient assay device structures schematic diagram under a kind of action of alternating magnetic field.
Embodiment
Describe enforcement of the present invention in detail below in conjunction with accompanying drawing:
See also Fig. 1, under described a kind of action of alternating magnetic field, metal solidification process interface heat exchange coefficient determinator comprises first melt temperature thermocouple 1, second melt temperature thermocouple 2, upper surface thermal insulation material 3, cylindrical die 4, inductive coil 5, mould temperature thermocouple 6, lower surface thermal insulation material 7, data acquisition and computing system 8.
When this device was measured, cylindrical die 4 was placed on lower surface thermal insulation material 7, after liquid metal injection cylindrical die 4 to be measured is interior, covered cylindrical die 4 upper surfaces with upper surface thermal insulation material 3.Apply alternating magnetic field by inductive coil 5 in cylindrical die 4 outsides, gather the temperature data of interior first the melt temperature thermocouple 1 of cylindrical die 4 and second melt temperature thermocouple 2 by data acquisition and computing system 8, gather simultaneously the temperature data of mould temperature thermocouple 6 by data acquisition and computing system 8, utilize the hot calculation procedure of anti-pass in data acquisition and computing system 8 to obtain metal solidification process interface heat exchange coefficient under the varying magnetic field effect.
Claims (5)
1. measurement mechanism of measuring the freezing interface coefficient of heat transfer under action of alternating magnetic field, comprise: cylindrical die (4), first melt temperature thermocouple (1), second melt temperature thermocouple (2), cylindrical die (4) is placed on lower surface thermal insulation material (7), cylindrical die (4) covers upper surface thermal insulation material (3), it is characterized in that, cylindrical die (4) is placed on inductive coil (5) interior zone.
2. a kind of measurement mechanism of measuring the freezing interface coefficient of heat transfer under action of alternating magnetic field according to claim 1, it is characterized in that, be embedded with mould temperature thermocouple (6) in cylindrical die (4), mould temperature thermocouple (6) wire is wrapped up with ferrous materials.
3. a kind of measurement mechanism of measuring the freezing interface coefficient of heat transfer under action of alternating magnetic field according to claim 1, it is characterized in that, be placed in the end of interior first the melt temperature thermocouple (1) of cylindrical die (4), second melt temperature thermocouple (2) not at grade.
4. according to claim 1 or 3 described a kind of measurement mechanisms of measuring the freezing interface coefficient of heat transfer under action of alternating magnetic field, it is characterized in that, first melt temperature thermocouple (1) is arranged into the home position of cylindrical die (4), first melt temperature thermocouple (1) top is 1/4 of cylindrical die (4) height bottom cylindrical die (4), second melt temperature thermocouple (2) is arranged into interior along on 1/4 position apart from cylindrical die (4), second melt temperature thermocouple (2) top is 1/2 of cylindrical die (4) height bottom cylindrical die (4).
5. a kind of measurement mechanism of measuring the freezing interface coefficient of heat transfer under action of alternating magnetic field according to claim 1, is characterized in that, the thickness of described upper surface thermal insulation material (3) and lower surface thermal insulation material (7) is 10-50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210574007.5A CN103115938B (en) | 2012-12-26 | 2012-12-26 | Device for measuring coefficient of heat transfer of solidification interface under action of alternating magnetic field |
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| CN201210574007.5A CN103115938B (en) | 2012-12-26 | 2012-12-26 | Device for measuring coefficient of heat transfer of solidification interface under action of alternating magnetic field |
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| CN103115938A true CN103115938A (en) | 2013-05-22 |
| CN103115938B CN103115938B (en) | 2015-01-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792256A (en) * | 2014-01-25 | 2014-05-14 | 内蒙古科技大学 | Experimental device for measuring periodical heat transfer coefficient |
| CN104698030A (en) * | 2015-03-27 | 2015-06-10 | 中南林业科技大学 | Determination method for interface heat transfer coefficient in casting process |
| CN112684388A (en) * | 2020-12-10 | 2021-04-20 | 大连理工大学 | Method for measuring medium-high frequency alternating magnetic field intensity based on eddy current effect |
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| US20080169074A1 (en) * | 2007-01-12 | 2008-07-17 | Nissan Motor Co., Ltd. | Solidification analysis method and apparatus |
| CN101876642A (en) * | 2009-04-30 | 2010-11-03 | 宝山钢铁股份有限公司 | Method and device for testing interfacial heat transfer coefficient during rapid solidification |
| JP2011245507A (en) * | 2010-05-26 | 2011-12-08 | Nippon Steel Corp | Estimating method for in-mold condition in continuous casting, device, and program |
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| CN202512078U (en) * | 2012-01-16 | 2012-10-31 | 昆明理工大学 | Solidification analysis device for heavy casting |
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2012
- 2012-12-26 CN CN201210574007.5A patent/CN103115938B/en not_active Expired - Fee Related
Patent Citations (5)
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| US20080169074A1 (en) * | 2007-01-12 | 2008-07-17 | Nissan Motor Co., Ltd. | Solidification analysis method and apparatus |
| CN101876642A (en) * | 2009-04-30 | 2010-11-03 | 宝山钢铁股份有限公司 | Method and device for testing interfacial heat transfer coefficient during rapid solidification |
| JP2011245507A (en) * | 2010-05-26 | 2011-12-08 | Nippon Steel Corp | Estimating method for in-mold condition in continuous casting, device, and program |
| CN202512078U (en) * | 2012-01-16 | 2012-10-31 | 昆明理工大学 | Solidification analysis device for heavy casting |
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| Y. NISHIDA ET AL.: "The Air-Gap Formation Process at the Casting-Mold Interface and the Heat Transfer Mechanism through the Gap", 《METALLURGICAL TRANSACTIONS B》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792256A (en) * | 2014-01-25 | 2014-05-14 | 内蒙古科技大学 | Experimental device for measuring periodical heat transfer coefficient |
| CN104698030A (en) * | 2015-03-27 | 2015-06-10 | 中南林业科技大学 | Determination method for interface heat transfer coefficient in casting process |
| CN112684388A (en) * | 2020-12-10 | 2021-04-20 | 大连理工大学 | Method for measuring medium-high frequency alternating magnetic field intensity based on eddy current effect |
| CN112684388B (en) * | 2020-12-10 | 2021-10-15 | 大连理工大学 | Method for measuring medium-high frequency alternating magnetic field intensity based on eddy current effect |
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| CN103115938B (en) | 2015-01-21 |
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