CN103115938B - Device for measuring coefficient of heat transfer of solidification interface under action of alternating magnetic field - Google Patents
Device for measuring coefficient of heat transfer of solidification interface under action of alternating magnetic field Download PDFInfo
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- CN103115938B CN103115938B CN201210574007.5A CN201210574007A CN103115938B CN 103115938 B CN103115938 B CN 103115938B CN 201210574007 A CN201210574007 A CN 201210574007A CN 103115938 B CN103115938 B CN 103115938B
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- cylindrical die
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- alternating magnetic
- temperature thermocouple
- heat transfer
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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, be related specifically to metal solidification process interface heat exchange coefficient determinator under a kind of action of alternating magnetic field.
Technical background
In metal casting operation, 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, plays very large impact to casting solidification process.Because the factor affecting interface heat exchange coefficient is a lot, as interracial contact situation, physical condition, electrochemical conditions and interface temperature etc., how the most difficult acquisition of interface heat exchange coefficient, ensure that process of setting heat transfer ensures it at one-dimensional square to being key factor.Simultaneously in modern casting process, the application of alternating magnetic field can strengthen the performance of foundry goods, is widely used, and under measuring action of alternating magnetic field, the work of process of setting interface heat exchange coefficient seems particularly important.But action of alternating magnetic field can produce larger deviation to measuring accuracy to the interference of measuring system etc.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 the impact of electromagnetic field on process of setting.
In prior art, Chinese patent 201110024245.4 discloses one " interface heating power coupling heat transfer coefficients measuring system and method ", this measuring method adopts surface of the work sweating heat galvanic couple, the temperature variation of test is transferred to temperature collect module by thermopair, obtains temperature variation data obtain interface heat exchange coefficient according to surface test point.But this method, owing to not having molten steel melt internal temperature data, easily brings comparatively big error to measurement, simultaneously this measuring method is not suitable for the measurement under alternating magnetic field.Due to alternating magnetic field, humorous wave interference is brought to the data acquisition of die surface thermopair, must shielding measure be applied.
Summary of the invention
For the deficiencies in the prior art part, an object of the present invention is under a kind of measurement of design action of alternating magnetic field, the device of process of setting interface heat exchange coefficient, and measurement mechanism is reliably easy, metal bath can be measured under action of alternating magnetic field, the interface heat exchange coefficient between metal bath and mould.Two of object of the present invention is a kind of means that can provide melt internal temperature 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 lower surface thermal insulation material, and cylindrical die covers upper surface thermal insulation material, and cylindrical die is placed on inductive coil interior zone.
The present invention be placed in first melt temperature thermocouple in cylindrical die, second melt temperature thermocouple end not at grade.
The thickness of described upper surface thermal insulation material and lower surface thermal insulation material is 10-50mm.
The present invention is by measuring metal bath and mold temperature change, and the temperature data recorded delivers to data acquisition system (DAS) and computing machine, obtains interface heat exchange coefficient.Wherein, diametric close to one dimensional heat transfer at it for ensureing cylindrical die, place thermal insulation material in cylindrical die upper and lower surface, thickness is 10-50mm.
For temperature thermocouple, two are immersed in mould and measure metal bath temperature variation, and four pre-buried measures in melt solidifying process in mould, and mold temperature changes.The thermoelectricity wherein measuring metal bath temperature variation on a rare occasion props up the home position being arranged into mould, thermopair top distance mold bottom is 1/4 of mold height, another is arranged into along on 1/4 position in distance mould, and thermopair top distance mold bottom is 1/2 of mold height.For shielding alternating magnetic field is 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 A/D converting transmission in computing machine by data acquisition system (DAS).
Whole mould is placed in solenoidal die cavity, alternating magnetic field is occurred by solenoid, and metal bath cools in the process applying alternating magnetic field, and the signal gathered by thermopair is collected by data acquisition system (DAS), and through computing, obtain melt solidifying interfacial heat transfer coefficient.
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 tool has the following advantages:
1) metal solidification process interface heat exchange coefficient determinator under a kind of action of alternating magnetic field of the present invention, the melt interface coefficient of heat transfer under action of alternating magnetic field can be measured, because alternating magnetic field brings humorous wave interference to the data acquisition of die surface thermopair, shielding measure is adopted to thermopair, under ensure that action of alternating magnetic field, the accuracy of temperature acquisition.
2) in melt mold upper and lower surface coated with certain thickness thermal insulation material, the melt solidifying process heat transfer of guarantee ensure its one-dimensional square to, around mould, namely set up the heat exchange environment of one dimension.
3) the present invention utilizes melt internal thermocouples to measure the temperature acquisition of unique point, and the calculating for interfacial heat exchange data provides more temperature data, ensure that the precision that interface heat exchange coefficient calculates.
Accompanying drawing explanation
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
Enforcement of the present invention is described in detail below in conjunction with accompanying drawing:
Refer to 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.
Cylindrical die 4 is placed on lower surface thermal insulation material 7, cylindrical die 4 covers upper surface thermal insulation material 3, the thickness of described upper surface thermal insulation material 3 and lower surface thermal insulation material 7 is 10-50mm, cylindrical die 4 is placed on inductive coil 5 interior zone, first melt temperature thermocouple 1 is arranged into the home position of cylindrical die 4, it is 1/4 place of cylindrical die 4 height bottom first melt temperature thermocouple 1 top distance cylindrical die 4, second melt temperature thermocouple 2 is arranged in distance cylindrical die 4 along on 1/4 position, it is 1/2 place of cylindrical die 4 height bottom second melt temperature thermocouple 2 top distance cylindrical die 4.Be embedded with mould temperature thermocouple 6 in cylindrical die 4, mould temperature thermocouple 6 wire ferrous materials is wrapped up.
When this device measures, cylindrical die 4 is placed on lower surface thermal insulation material 7, and liquid metal to be measured injects after in cylindrical die 4, covers cylindrical die 4 upper surface with upper surface thermal insulation material 3.Alternating magnetic field is applied in cylindrical die 4 outside by inductive coil 5, the temperature data of interior first the melt temperature thermocouple 1 of cylindrical die 4 and second melt temperature thermocouple 2 is gathered by data acquisition and computing system 8, gathered the temperature data of mould temperature thermocouple 6 simultaneously by data acquisition and computing system 8, utilize the hot calculation procedure of the anti-pass in data acquisition and computing system 8 to obtain metal solidification process interface heat exchange coefficient under varying magnetic field effect.
Claims (2)
1. measure the measurement mechanism of the freezing interface coefficient of heat transfer under action of alternating magnetic field for one kind, 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; Be embedded with mould temperature thermocouple (6) in cylindrical die (4), mould temperature thermocouple (6) wire ferrous materials is wrapped up; Be placed in first melt temperature thermocouple (1) in cylindrical die (4), second melt temperature thermocouple (2) end not at grade; First melt temperature thermocouple (1) is arranged into the home position of cylindrical die (4), first melt temperature thermocouple (1) top distance cylindrical die (4) bottom is 1/4 of cylindrical die height, second melt temperature thermocouple (2) is arranged into along on 1/4 position in distance cylindrical die (4), and second melt temperature thermocouple (2) top distance cylindrical die (4) bottom is 1/2 of cylindrical die (4) height.
2. a kind of measurement mechanism measuring the freezing interface coefficient of heat transfer under action of alternating magnetic field according to claim 1, it 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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| Application Number | Priority Date | Filing Date | Title |
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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 CN103115938A (en) | 2013-05-22 |
| CN103115938B true CN103115938B (en) | 2015-01-21 |
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| CN201210574007.5A Expired - Fee Related 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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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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| DE102008003962B4 (en) * | 2007-01-12 | 2013-10-17 | Nissan Motor Co., Ltd. | Solidification analysis method and apparatus |
| CN101876642B (en) * | 2009-04-30 | 2012-01-11 | 宝山钢铁股份有限公司 | Method and device for testing interfacial heat transfer coefficient during rapid solidification |
| JP5505086B2 (en) * | 2010-05-26 | 2014-05-28 | 新日鐵住金株式会社 | Method, apparatus and program for estimating state in mold in continuous casting |
| CN202512078U (en) * | 2012-01-16 | 2012-10-31 | 昆明理工大学 | Solidification analysis device for heavy casting |
| CN102661966B (en) * | 2012-05-16 | 2015-07-01 | 上海大学 | Method and device for measuring linear shrinkage rate and thermal stress of metal solidification process |
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