CN105081288B - It is a kind of for studying the experimental simulation device and method of metal bath process of setting under temperature field-flow field coupling condition - Google Patents
It is a kind of for studying the experimental simulation device and method of metal bath process of setting under temperature field-flow field coupling condition Download PDFInfo
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Abstract
The invention discloses a kind of for studying the experimental simulation device and method of metal bath process of setting under temperature field-flow field coupling condition, device includes ceramic-mould, the temperature control component being made of multiple temperature conditioning units is installed on the surface of the ceramic-mould, the temperature control component is connect with a control computer, heat-insulated end plate is housed at the both ends of the ceramic-mould, the experimental simulation device further includes the melt flow field driving device for being placed into the ceramic-mould top.The temperature control component is connect by a computer connectivity port with the control computer, which is close to installation with the temperature control component.The temperature conditioning unit includes cooling unit, temperature measuring unit and heating unit.The melt flow field driving device is electromagnetism or mechanical pump.
Description
Technical field
The invention belongs to emtallurgy research equipment technical fields, in particular to a kind of for studying metal bath in temperature field-
The experimental simulation device and method of process of setting under the coupling condition of flow field.
Background technique
With the high speed development of national economy, the demand and day of metallurgy, the energy, traffic and chemical field to heavy casting and forging
All to increase, quality requirement also increasingly improves, especially in fields such as the advanced energy, aerospaces.In advanced energy field, although I
The ability that state has had design, manufactured conventional Supercritical unit, but in the technology of preparing of heavy casting and forging, with foreign countries there are still
Larger gap.According to China《Heavy casting and forging industry 12 is planned》Report, China needs 300MW or more unit within 2007
Steam turbine, motor low pressure rotor demand about at 201 or so, China is only capable of providing less than 16, remaining can only lean on import solution
Certainly.It plans while also indicating that, to before the year two thousand twenty, China's water power expects with fired power generating unit heavy casting and forging demand will be at 2.7 ten thousand tons
Left and right has huge notch between demand and market.In aviation and civil field, aviation high-strength/tenacity aluminum alloy such as 7xxx
It is that (thickness is still lower not less than the melt casting process level of 500mm), manufacturing capacity is still lower, such as allusion quotation for big specification slab ingot
The whole localization rate of parts and components of the high-performance aluminium alloy of type on the domestic aircraft such as C919 and ARJ21 is also less than 30%.Due to large size
The general body of casting is huge, service life is long, quality requirement is high, manufacture difficulty is big, in addition production process is to the energy and material etc.
Consumption is big, and high in technological content, manufacturing technology has become the major obstacle for hindering each field autonomous innovation.Therefore, country
Through by the manufacture of heavy casting and forging be classified as 12 plan give priority to object.To improve the production level of the big casting in China
Just have to the process of setting to big casting, Solidification Characteristics are studied.Because the general material of big casting is special, size is big, casting
It is harsh to make complex process, casting condition, the cost once tested often arrives up to ten million left and right millions of, so can not be according to biography
System method passes through its casting technological parameter of large-scale experimental exploring.Because of the high temperature of heavy castings casting process, opaque spy
Sign can not carry out conventional direct observation, physical analogy or observe freezing interface by pouring out method, be studied by thermal analysis system
Its process of setting.Meanwhile because actual metal freezing is even more a nonequilibrium process, the solidifying of metal is theoretically speculated
Gu process also has certain deviation.
Chinese invention patent (CN104226952A) is using in the method simulation continuous casting steel billet casting process of directional solidification
The temperature field of solidification of metal melt process, construction is relatively simple, does not provide flow field simulation, it is more simple to be only applicable to temperature field
It is single, the inviolent casting process simulation of melt flows.
Summary of the invention
The object of the present invention is to provide one kind for studying metal bath process of setting under temperature field-flow field coupling condition
Experimental simulation device and method, can accurate simulation heavy castings typical parts Solidification Characteristics, reproduce casting process in gold
Belong to process of setting, predicts the solidified structure of casting.
Realization principle of the invention is：
In casting solidification process, the growth of solidified structure crystal in other words is mainly influenced by temperature field, flow field.And it is big
In type casting, the temperature field and flow field of privileged site are inconvenient to monitor.Current casting is proved in the foundry practice of many years
Simulation softward can carry out a degree of reproduction to the temperature field of casting process and flow field by finite element method.If design
One casting mould similar with the boundary condition of finite element modelling, passes through multiple numerical simulation and verification experimental verification, so that it may obtain
The difference between simulated conditions and experiment condition is obtained, the temperature field of experimental rig simulation heavy castings typical parts is then recycled
And field of flow, just realize the simulation to heavy castings typical parts process of setting.
For this purpose, the scheme that the present invention uses as previously mentioned, the crystal growing process in casting solidification process mainly by temperature
The influence of field and flow field is spent, and the temperature field and flow field can not be obtained by physical observation or the method for detection, and by having
Limit member simulation can provide relatively reliable boundary condition for the simulation to casting typical parts, and obtain and practical solidification item
The consistent experimental result of part.
The technical scheme is that a kind of solidified under temperature field-flow field coupling condition for studying metal bath
The experimental simulation device of journey, the device include ceramic-mould, are equipped on the surface of the ceramic-mould by multiple temperature conditioning units
The temperature control component of composition, the temperature control component are connect with a control computer,
Heat-insulated end plate is housed at the both ends of the ceramic-mould,
The experimental simulation device further includes the melt flow field driving device for being placed into the ceramic-mould top.
The temperature control component is connect by a computer connectivity port with the control computer, the computer connectivity port and
The temperature control component is close to installation.
The temperature conditioning unit includes cooling unit, temperature measuring unit and heating unit.
The melt flow field driving device is electromagnetism or mechanical pump.
It is a kind of for studying the experiment analogy method of metal bath process of setting under temperature field-flow field coupling condition,
It is characterized in that, includes the following steps：
A1 using finite element software to the casting object Geometric Modeling after metal bath casting solidification, and is carried out tentatively
The typical component for occurring defect in analog result is carried out discretization, obtains the boundary of discrete locations by casting modeling and simulation of solidification
Condition；
A2 constructs casting mold according to the three-dimensional dimension of discrete locations, and casting mold is used with the ceramic-mould compared with high heat resistance temperature；
A3, using the temperature control component being made of multiple temperature conditioning units, the temperature of the temperature control component is by a control computer pair
Each temperature conditioning unit carries out heating and cooling control simultaneously；
Temperature control component is fixed on ceramic-mould wall by A4, and the foundation in temperature field is by control computer machine according to finite element
The boundary condition of simulation sets the temperature conditioning unit on ceramic-mould wall；
A melt flow field driving device is arranged in A5 at the upper opening of ceramic-mould, the melt flow field driving device
Entry position and outlet port, Way in and export direction and power and revolving speed are adjustably controlled；
Melt is poured into casting mold, pressed by A6 after finite element modelling result conditions setting and correlated variables condition
Test simulation is carried out according to the finite element modelling feature for the casting studied and is verified.
Melt flow field driving device described in step A5 is electromagnetism or mechanical pump, and Way in, the export direction of pump are logical
Mechanical system is crossed to be set, flow velocity is controlled by changing power, the revolving speed of electromagnetic pump or mechanical pump, entry position and
Outlet port mechanically drives, to control the speed set, direction mobile away from metal bath surface programming depth.
Step A7 is still further comprised,
A7 optimizes casting process using step A1 to A6, obtains more optimized casting condition.
It is a kind of for studying the experiment analogy method of metal bath process of setting under temperature field-flow field coupling condition,
It is characterized in that, includes the following steps：
B1 carries out Geometric Modeling to the heavy castings studied, and with by the authenticated model validation of small-sized casting
Finite element model simulates the casting process of setting of heavy castings；
B2, selection are easy to appear the typical parts of casting flaw, 3D modeling are carried out to it, and according to 3D model preparation ceramics
Casting mold；
B3, according to finite element modelling as a result, built 3D model temperature on large castings and Field Characteristics are refined into
For the boundary condition and variable of experiment simulation, the control computer of experimental simulation device is inputted；
B4 installs the component of multiple temperature conditioning unit compositions on ceramic-mould surface, and is attached with control computer；
B5 installs heat-insulated end plate additional at ceramic-mould both ends, and preheats to it；
Ceramic-mould temperature outside is set cast temperature, and the casting metal melts into ceramic-mould by B6；
B7 is entered on the upside of melt flow field driving device merging ceramic-mould, exports and submerge melt liquid level or less less
Perhaps distance, and entrance is set according to flow field direction；
B8 is set the temperature conditioning unit on the outside of ceramic-mould according to the resulting thermo parameters method of finite element modelling result
It sets, and adjusts each temperature conditioning unit temperature by change of temperature field situation；
B9 controls the entrance and melt flow rate of melt flow field driving device, is inside ceramic-mould
It solidifies molten bath part and creates the melt flows similar with the melt flow field in process of setting；
B10, under above-mentioned simulated conditions, melt is cooled into casting in ceramic-mould, which is studied item
The solidified structure of heavy castings typical parts under part.
The experiment analogy method that a kind of research metal bath of the invention solidifies under temperature field-flow field coupling condition is led to
It crosses on a large scale using temperature conditioning unit, is obtained on the outside of ceramic-mould and temperature field similar in finite element modelling result；By casting
Melt flow field driving device is added at the top of type, is obtained in ingot casting and temperature field (finite element mould similar in finite element modelling result
Boundary condition used in quasi- result picks up from large-scale casting ingot process of setting) to simulate the temperature in casting solidification process completely
Field, flow field change are spent, the solidified structure being closer to practical casting solidification process is obtained.It can be by heavy castings using this method
In be easy to occur the process of setting of the typical parts of defect by being tested after the discrete separation of FInite Element in small scale experiments
Card, without carrying out casting process simulation to entire casting and carrying out cutting analysis, which increase the casting research experiments of heavy castings
Feasibility.The casting condition of typical parts can be optimized using experimental result using this method simultaneously, backstepping goes out Big Steel Castings
The optimization casting technique condition of part provides reliable laboratory reference foundation for exploitation, the manufacture of heavy castings.
Detailed description of the invention
Fig. 1 is the experiment analogy method process under heavy castings temperature field-flow field coupling in the embodiment of the present invention
Figure.
Fig. 2 is the experimental simulation device signal under heavy castings temperature field-flow field coupling in the embodiment of the present invention
Figure.
Fig. 3 is the experiment simulation temperature conditioning unit under heavy castings temperature field-flow field coupling in the embodiment of the present invention
Schematic diagram.
Wherein, 1 --- ceramic-mould, 2 --- heat-insulated end plate, 3 --- temperature conditioning unit, 4 --- melt flow field driving device,
5 --- computer connectivity port, 6 --- control computer, 7 --- cooling unit, 8 --- temperature measuring unit, 9 --- heating unit.
Specific embodiment
Below with reference to example, the present invention is further described below.Such as Fig. 1, and combine shown in Fig. 2 and Fig. 3.
1) carries out Geometric Modeling to the heavy castings studied, and with by the authenticated model validation of small-sized casting
Finite element model simulates the casting process of setting of heavy castings；
2) selection is easy to appear the typical parts of casting flaw, 3D modeling is carried out to it, and according to 3D model preparation ceramics
Casting mold 1；
3) is according to finite element modelling as a result, built 3D model temperature on large castings and Field Characteristics are refined into
For the boundary condition and variable of experiment simulation, the control computer 6 of experimental simulation device is inputted；
4) installs temperature conditioning unit 3 on 1 surface of ceramic-mould and is attached with control computer 6；At 1 both ends of ceramic-mould
It installs heat-insulated end plate 2 additional, and it is preheated；
6) 1 temperature outside of ceramic-mould is set cast temperature, and the casting metal melts into casting mold by；
7) melt flow field driving device 4 is placed on the upside of ceramic-mould by, is entered, exports and submerge melt liquid level or less
A little, and according to flow field direction entrance is set；
8) is set the temperature conditioning unit 3 on the outside of ceramic-mould according to the resulting thermo parameters method of finite element modelling result
It sets, and adjusts each temperature conditioning unit temperature by change of temperature field situation；
9) controls the entrance and melt flow rate of melt flow field driving device, is inside ceramic-mould
It solidifies molten bath part and creates the melt flows similar with the melt flow field in process of setting；
10) under above-mentioned simulated conditions, melt is cooled into casting in ceramic-mould.The casting is studied item
The solidified structure of heavy castings typical parts under part.
The present invention simulates the boundary temperature item of typical component during finite element by utilizing temperature conditioning unit on a large scale
Part, and flow field control unit is utilized, the melt flow field in typical component process of setting is simulated, is realized by realizing mould on a small scale
The mode of quasi- heavy castings typical parts process of setting, to infer the coagulation defect occurrence law of entire heavy castings, and can lead to
Cross parameter adjustment simulative optimization technique, the casting result after examining process optimization.It was generally cast since the analogy method has
The temperature field of journey, flow field simulation condition, therefore the technology can be widely popularized the experiment of other solidification of metal melt, casting field
It is that the solidification simulation of casting field saves a large amount of human and material resources, fund, and improves process exploitation efficiency in simulation.
Claims (3)
1. it is a kind of for studying the experiment analogy method of metal bath process of setting under temperature field-flow field coupling condition, it is special
Sign is that the experimental simulation device that the experiment analogy method uses includes ceramic-mould, pacifies on the surface of the ceramic-mould
Equipped with the temperature control component being made of multiple temperature conditioning units, which connect with a control computer, in the ceramic-mould
Both ends be equipped with heat-insulated end plate, the experimental simulation device further include be placed into the ceramic-mould top melt flow field drive
Dynamic device；The temperature control component is connect by a computer connectivity port with the control computer, the computer connectivity port and
The temperature control component is close to installation；The temperature conditioning unit includes cooling unit, temperature measuring unit and heating unit；The melt flow field
Driving device is electromagnetic pump or mechanical pump；
The experiment analogy method includes the following steps：
A1 using finite element software to the casting object Geometric Modeling after metal bath casting solidification, and carries out preliminary casting
The typical component for occurring defect in analog result is carried out discretization, obtains the boundary condition of discrete locations by modeling and simulation of solidification；
A2 constructs casting mold according to the three-dimensional dimension of discrete locations, and casting mold is used with the ceramic-mould compared with high heat resistance temperature；
Temperature control component is fixed on ceramic-mould wall by A3, and the foundation in temperature field is by control computer machine, according to finite element modelling
Boundary condition the temperature conditioning unit on ceramic-mould wall is set；
A melt flow field driving device, the entrance of the melt flow field driving device is arranged in A4 at the upper opening of ceramic-mould
Position and outlet port, Way in and export direction and power and revolving speed can adjust control；
Melt is poured into casting mold after finite element modelling result conditions setting and correlated variables condition by A5, according to institute
The finite element modelling feature of the casting of research carries out test simulation and verifies.
2. as described in claim 1 for studying the experiment of metal bath process of setting under temperature field-flow field coupling condition
Analogy method, which is characterized in that still further comprise step A6, using step A1 to A5, casting process is optimized, obtain
More optimized casting condition.
3. it is a kind of for studying the experiment analogy method of metal bath process of setting under temperature field-flow field coupling condition, it is special
Sign is that the experimental simulation device that the experiment analogy method uses includes ceramic-mould, pacifies on the surface of the ceramic-mould
Equipped with the temperature control component being made of multiple temperature conditioning units, which connect with a control computer, in the ceramic-mould
Both ends be equipped with heat-insulated end plate, the experimental simulation device further include be placed into the ceramic-mould top melt flow field drive
Dynamic device；The temperature control component is connect by a computer connectivity port with the control computer, the computer connectivity port and
The temperature control component is close to installation；The temperature conditioning unit includes cooling unit, temperature measuring unit and heating unit；The melt flow field
Driving device is electromagnetism or mechanical pump；
The experiment analogy method includes the following steps：
B1 carries out Geometric Modeling to the heavy castings studied, and with by the limited of the authenticated model validation of small-sized casting
Meta-model simulates the casting process of setting of heavy castings；
B2, selection are easy to appear the typical parts of casting flaw, 3D modeling are carried out to it, and cast according to 3D model preparation ceramics
Type；
B3, according to finite element modelling as a result, built 3D model temperature on large castings and Field Characteristics, which are refined, becomes real
The boundary condition and variable for testing simulation input the control computer of experimental simulation device；
B4 installs the component of multiple temperature conditioning unit compositions on ceramic-mould surface, and is attached with control computer；
B5 installs thermal insulation board additional at ceramic-mould both ends, and preheats to it；
Ceramic-mould temperature outside is set cast temperature, and the casting metal melts into ceramic-mould by B6；
B7, by melt flow field driving device merging ceramic-mould on the upside of, entered, export submerge melt liquid level or less a little away from
From, and entrance is set according to flow field direction；
Temperature conditioning unit on the outside of ceramic-mould is configured by B8 according to the resulting thermo parameters method of finite element modelling result, and
Each temperature conditioning unit temperature is adjusted by change of temperature field situation；
B9 controls the entrance and melt flow rate of melt flow field driving device, is solidification inside ceramic-mould
Create the melt flows similar with the melt flow field in process of setting in molten bath part；
B10, under above-mentioned simulated conditions, melt is cooled into casting in ceramic-mould, which is under institute's study condition
The solidified structure of heavy castings typical parts.
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| CN106407547A (en) * | 2016-09-12 | 2017-02-15 | 西北工业大学 | Numerical simulation method for aiming at casting residual stress of anisotropic material |
| CN111208016B (en) * | 2020-02-12 | 2021-02-26 | 东北大学 | Continuous casting billet surface crack propagation critical strain measurement and crack propagation prediction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2872518B1 (en) * | 2004-07-02 | 2007-07-27 | Usinor Sa | POCKET BULLAGE MONITORING METHOD AND IMPLEMENTATION INSTALLATION |
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| CN2715885Y (en) * | 2004-07-08 | 2005-08-10 | 上海大学 | Gradient strong magnetic field unidirectional solidification crystallization apparatus |
| CN101567019A (en) * | 2009-05-08 | 2009-10-28 | 江苏大学 | Computer simulation method for casting property of particle-reinforced aluminum matrix composite |
| CN101963608A (en) * | 2009-07-25 | 2011-02-02 | 比亚迪股份有限公司 | Method for predicting shrinkage porosity in metal liquid solidification process and shrinkage porosity continuous prediction method |
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| CN103600045A (en) * | 2013-11-18 | 2014-02-26 | 上海大学 | Continuous steel casting process and device with function of electromagnetic excitation compound mechanical stirring |
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