CN110287556B - Modeling method for fusion-cast explosive pressurized casting process - Google Patents

Modeling method for fusion-cast explosive pressurized casting process Download PDF

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CN110287556B
CN110287556B CN201910506622.4A CN201910506622A CN110287556B CN 110287556 B CN110287556 B CN 110287556B CN 201910506622 A CN201910506622 A CN 201910506622A CN 110287556 B CN110287556 B CN 110287556B
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casting
pressurizing
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cast explosive
casting process
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CN110287556A (en
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刘瑞鹏
贾宪振
王永顺
蒋秋黎
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Xian Modern Chemistry Research Institute
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    • CCHEMISTRY; METALLURGY
    • C06EXPLOSIVES; MATCHES
    • C06BEXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033Shaping the mixture
    • C06B21/0041Shaping the mixture by compression
    • CCHEMISTRY; METALLURGY
    • C06EXPLOSIVES; MATCHES
    • C06BEXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033Shaping the mixture
    • C06B21/0058Shaping the mixture by casting a curable composition, e.g. of the plastisol type
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/06Power analysis or power optimisation
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08Thermal analysis or thermal optimisation

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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Abstract

A modeling method for a casting explosive pressurized casting process is used for constructing a calculation model for the casting explosive pressurized casting process and comprises the following steps: the method comprises the following four steps of (1) constructing a pretreatment model, (2) importing material parameters, (3) specifying initial and boundary conditions, and (4) setting control parameters. The method is suitable for modeling calculation of the cast explosive pressure casting process in a wide pressure range, has strong pertinence, and can provide technical support for the cast explosive pressure casting process simulation.

Description

Modeling method for casting explosive pressurized casting process
Technical Field
The invention belongs to the field of cast explosive process simulation modeling, and particularly relates to a modeling method for a cast explosive pressurized casting process.
Background
In general, the preparation process of the fusion-cast explosive can be divided into main process links such as melting, mixing, casting, solidifying and the like. The casting process is a key link related to the quality of the casting explosive filling quality. Fused cast explosives generally have a high material viscosity and may cause filling defects when the explosive charge structure contains small parts. The pressure casting is a common casting process, can improve the filling and compacting degree of a casting, shortens the solidification time, is favorable for improving the product quality and reduces the generation of solidification defects. But for safety cost reasons it is difficult to practically deploy the melt-cast explosive pressure casting process on a large scale. Therefore, most of the explosive materials are pre-researched by adopting a process simulation design method, so that a modeling method of a fusion-cast explosive pressure casting process is correspondingly required to be created for guiding practical application.
Chinese patent CN201710991106.6 discloses a casting method for combining graphite blocks into a casting mold by digital processing, and the size, shape and dimension of a cast part are modeled by a computer. The invention does not relate to a method of modelling a pressure casting process.
Therefore, the invention needs to provide a modeling method for the cast explosive pressurized casting process, and provides technical support for the cast explosive pressurized casting process simulation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a modeling method for a fusion-cast explosive pressure casting process, which provides support for the construction of a fusion-cast explosive pressure casting process calculation model.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention relates to a modeling method for a fusion-cast explosive pressurized casting process, which is characterized by comprising the following steps of:
s1, constructing a pretreatment model, constructing geometric models of all parts of a fusion-cast explosive pressurization casting system by using modeling software Workbench design model, wherein the geometric models comprise a pressurization die, a casting piece, a casting channel and a cooling channel, guiding the pressurization die, the casting piece, the casting channel and the cooling channel geometric models into a VisualCAST component, and carrying out finishing and assembling operations to form a combined solid structure; dividing a computational grid for the combined solid structure by adopting a visual mesh component to obtain a pressurizing casting process computational model;
s2, introducing material parameters which comprise density, heat conduction coefficient and specific heat capacity to the pressing die, the casting die and the casting respectively on the basis of the calculation model obtained in the step S1;
s3, initial and boundary conditions are designated, and initial conditions including casting speed, casting pressure and casting temperature are designated to the casting channel in the calculation model obtained in the step S1; specifying boundary conditions for the cooling channel, including cooling medium and convective heat transfer coefficient; specifying boundary conditions for the pressurizing die, including a pressurizing pressure range and a pressurizing duration;
and S4, setting control parameters, wherein on the basis of the step S3, the control model is set to be a heat conduction and laminar flow coupling calculation model, the control parameters comprise a critical solid fraction, a total step number and a calculation stopping temperature, and a calculation parameter file is formed for a demand solver to call and execute calculation.
Further, in step S1, the type of the divided computational mesh is a tetrahedral computational mesh, the formed tetrahedral computational mesh has no serious distortion or deformation, and the tetrahedral computational mesh can be adapted to various complex geometric solid models.
Further, in step S2, the pressing mold is made of stainless steel, the casting mold is made of copper or stainless steel, and the casting is a cast explosive.
Further, in step S3, the pressurizing pressure ranges from 0.3MPa to 1.0MPa.
Further, in step S4, the critical solid fraction ranges from 0.3 to 0.95. The critical solid fraction reflects the feeding capacity of the liquid phase melt in the pressure maintaining stage and can be adjusted according to the pressurizing pressure range.
Further, in step S4, the setting control parameters further include a heat conduction general setting parameter and a flow general setting parameter.
The technical scheme provided by the invention is used for solving the modeling problem of the pressure casting process of the fusion-cast explosive. The invention is mainly characterized in that: the characteristics of the pressure casting process are reflected by the range of the pressure and the variation of the critical fraction of solid phase. The pressurizing pressure range can be matched with the pressurizing casting range required by actual design, the critical solid fraction reflects the feeding capacity of the liquid-phase melt to solidification defects in the pressurizing and pressure maintaining stage, the actual condition that the pressurizing casting process improves the powder filling density is reflected, and the method has wide practicability. Meanwhile, the invention enhances the guidance of the actual process by a process simulation method, improves the preparation process level and has obvious novelty.
The invention has the following advantages:
(1) The invention can be combined with a concrete pressure casting process actual system to carry out modeling, and has strong pertinence;
(2) The invention is suitable for the pressure casting process with wide pressure range;
(3) The invention can conveniently adjust the calculation parameters and realize the virtual simulation of the pressurized casting process.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
The TNT-based fusion-cast explosive is applied to modeling in a compression casting process. TNT is the code number of 2,4, 6-trinitrotoluene. The formula of the fusion cast explosive comprises: TNT/aluminum powder =33/67 (mass ratio), and code number is explore 1.
S1, constructing a pretreatment model, constructing five geometric models such as a pressurizing mould, a casting piece, a casting channel, a cooling channel and the like in an Explo1 fusion casting explosive pressurizing and casting system by adopting three-dimensional geometric modeling software Workbench design model, introducing the five models into a VisualCAST assembly, correcting the geometric models, and then assembling to form a combined solid structure; dividing a tetrahedral calculation grid for the combined solid structure by using a visual mesh component to obtain a calculation model of the pressurized casting process;
s2, introducing material parameters, and introducing parameters of a pressing die, a casting die and casting materials into the calculation model, wherein the pressing die is made of Q235 stainless steel materials and has the density of 7.8g/cm 3 Coefficient of thermal conductivity 45 W.m -1 ·℃ -1 The specific heat capacity is 461 J.kg -1 ·℃ -1 (ii) a The casting mold is made of brass and has a density of 8.9g/cm 3 A heat transfer coefficient of 120 W.m -1 ·℃ -1 The specific heat capacity is 392 J.kg -1 ·℃ -1 (ii) a The casting is an Explo1 fusion-cast explosive with the density of 2.27g/cm 3 A heat transfer coefficient of 0.3 W.m -1 ·℃ -1 The specific heat capacity is 1150 J.kg -1 ·℃ -1
S3, specifying initial and boundary conditions, specifying the initial conditions for a casting channel in a calculation model, and specifying the casting speed of the Explo1 fusion-cast explosive to be 0.5m/S, the casting pressure to be 0.15MPa and the casting temperature to be 93 ℃; the boundary conditions are specified for the cooling channel, the cooling medium is natural air cooling at 15-25 ℃, and the convective heat transfer coefficient is 10 W.m -2 ℃C -1 (ii) a The boundary conditions were specified for the press die, the press pressure range was 0.3MPa, and the press duration was 1800s.
And S4, setting control parameters, setting the control model as a heat conduction and laminar flow coupling calculation model on the basis of the step S3, setting the critical solid phase fraction of the Explo1 fusion-cast explosive to be 0.1, calculating the total step number to be 6000 steps, and calculating the stopping temperature to be 20 ℃, so as to form a calculation parameter file, and calling a solver to execute calculation.
The modeling in the embodiment has strong pertinence, wide applicable pressure range and convenient calculation parameter adjustment, and can provide reference and reference for fusion cast explosive process simulation.
Example 2
The TNT-based fusion-cast explosive is applied to modeling in a compression casting process. TNT is the code of 2,4, 6-trinitrotoluene, and RDX is the code of hexogen. The formula of the fusion cast explosive comprises: TNT/RDX/aluminum powder =33/52/15 (mass ratio), code No. explore 2.
S1, constructing a pretreatment model, constructing five geometric models such as a pressurizing mould, a casting channel, a cooling channel and the like in an Explo2 fusion casting explosive pressurizing and casting system by adopting three-dimensional geometric modeling software Workbench design model, introducing the models into a VisualCAST component, trimming the geometric models, and then assembling to form a combined solid structure; dividing a tetrahedral calculation grid for the combined solid structure by using a visual mesh component to obtain a calculation model of the pressurized casting process;
s2, introducing material parameters, and introducing parameters of a pressing die, a casting die and casting materials into the calculation model, wherein the pressing die is made of 304 stainless steel materials, the casting die is made of 304 stainless steel materials, and the density is 7.9g/cm 3 Coefficient of thermal conductivity 55 W.m -1 ·℃ -1 Specific heat capacity of 472 J.kg -1 ·℃ -1 (ii) a The casting is an Explo2 fused cast explosive with the density of 1.88g/cm 3 A coefficient of thermal conductivity of 0.4 W.m -1 ·℃C -1 The specific heat capacity is 1230 J.kg -1 ·℃ -1
S3, specifying initial and boundary conditions, specifying the initial conditions for a casting channel in the calculation model, and specifying the pouring speed of the Explo2 fusion-cast explosive to be 0.8m/S, the pouring pressure to be 0.12MPa and the pouring temperature to be 104 ℃; the boundary conditions are specified for the cooling channel, the cooling medium is natural air cooling at 15-25 ℃, and the convective heat transfer coefficient is 12 W.m -2 ·℃ -1 (ii) a Boundary conditions were specified for the pressurizing die, the pressurizing pressure range was 0.5MPa, and the pressurizing duration was 2100s.
And S4, setting control parameters, setting the control model as a heat conduction and laminar flow coupling calculation model on the basis of the step S3, setting the critical solid fraction of the Explo2 fusion-cast explosive to be 0.3, calculating the total step number to be 6200, and calculating the stopping temperature to be 22 ℃, so as to form a calculation parameter file for a solver to call and execute calculation.
The modeling in the embodiment has strong pertinence, wide applicable pressure range and convenient calculation parameter adjustment, and can provide reference and reference for fusion cast explosive process simulation.
Example 3
The method is applied to modeling the DNAN-based fusion-cast explosive pressure casting process. DNAN is the code of 2, 4-dinitroanisole, RDX is the code of hexogen, and AP is the code of ammonium perchlorate. The formula of the fusion casting explosive comprises: DNAN/RDX/aluminum powder/AP =22/36/18/24 (mass ratio), and the code is Explo3.
S1, constructing a pretreatment model, constructing five geometric models such as a pressurizing mould, a casting channel, a cooling channel and the like in an Explo3 fusion casting explosive pressurizing and casting system by adopting three-dimensional geometric modeling software Workbench design model, introducing the models into a VisualCAST component, trimming the geometric models, and then assembling to form a combined solid structure; dividing a tetrahedral calculation grid for the combined solid structure by using a visual mesh component to obtain a calculation model of the pressurized casting process;
s2, introducing material parameters, and introducing parameters of a pressing die, a casting die and casting materials into the calculation model, wherein the pressing die is made of 304 stainless steel materials, the casting die is made of 304 stainless steel materials, and the density is 7.9g/cm 3 Coefficient of thermal conductivity 55 W.m -1 ·℃ -1 Specific heat capacity of 472 J.kg -1 ·℃ -1 (ii) a The casting is an Explo3 fused cast explosive with the density of 1.94g/cm 3 A coefficient of thermal conductivity of 0.5 W.m -1 ·℃ -1 The specific heat capacity is 1070 J.kg -1 ·℃ -1
S3, specifying initial and boundary conditions, specifying the initial conditions for a casting channel in a calculation model, and specifying the pouring speed of the Explo3 fusion-cast explosive to be 1.2m/S, the pouring pressure to be 0.18MPa and the pouring temperature to be 113 ℃; the boundary conditions are specified for the cooling channel, the cooling medium is cooling water with the temperature of 5-10 ℃, and the heat convection coefficient isIs 100 W.m -2 ·℃ -1 (ii) a The boundary conditions were specified for the pressurizing die, the pressurizing pressure range was 0.7MPa, and the pressurizing duration was 2400s.
And S4, setting control parameters, setting the control model as a heat conduction and laminar flow coupling calculation model on the basis of the step S3, setting the critical solid fraction of the Explo3 fusion-cast explosive to be 0.6, calculating the total step number to be 6800 steps, and calculating the stop temperature to be 25 ℃, forming a calculation parameter file for a solver to call and execute calculation.
The modeling in the embodiment has strong pertinence, wide applicable pressure range and convenient calculation parameter adjustment, and can provide reference and reference for fusion cast explosive process simulation.
Example 4
The method is applied to modeling the DNTF-based fusion-cast explosive pressure casting process. DNTF is the code of 3, 4-dinitrofurazan-based oxidized furazan, and HMX is the code of octogen. The formula of the fusion cast explosive comprises: DNTF/HMX/aluminum powder =28/49/23 (mass ratio), code No. explore 4.
S1, constructing a pretreatment model, constructing five geometric models such as a pressurizing mould, a casting piece, a casting channel, a cooling channel and the like in an Explo4 fusion casting explosive pressurizing and casting system by adopting three-dimensional geometric modeling software Workbench design model, introducing the geometric models into a VisualCAST assembly, finishing the geometric models, and then assembling to form a combined solid structure; dividing a tetrahedral calculation grid for the combined solid structure by using a visual mesh component to obtain a calculation model of the pressurized casting process;
s2, introducing material parameters, and introducing parameters of a pressing die, a casting die and casting materials into the calculation model, wherein the pressing die is made of Q235 stainless steel materials and has the density of 7.8g/cm 3 Coefficient of thermal conductivity 45 W.m -1 ·℃ -1 Specific heat capacity of 461J/kg -1 ·℃ -1 (ii) a The casting mold is made of brass and has a density of 8.9g/cm 3 A heat transfer coefficient of 120 W.m -1 ·℃ -1 The specific heat capacity is 392 J.kg -1 ·℃ -1 (ii) a The casting is an Explo4 fusion-cast explosive with the density of 2.09g/cm 3 A coefficient of thermal conductivity of 0.4 W.m -1 ·℃ -1 Having a specific heat capacity of980J·kg -1 ·℃ -1
S3, specifying initial and boundary conditions, specifying the initial conditions for a casting channel in a calculation model, and specifying the pouring speed of the Explo4 fusion-cast explosive to be 1.5m/S, the pouring pressure to be 0.2MPa and the pouring temperature to be 125 ℃; the boundary conditions are specified for the cooling channel, the cooling medium is cooling water with the temperature of 5-10 ℃, and the convective heat transfer coefficient is 190 W.m -2 ·℃ -1 (ii) a Boundary conditions were specified for the pressurizing die, the pressurizing pressure range was 1.0MPa, and the pressurizing duration was 3600s.
And S4, setting control parameters, setting the control model as a heat conduction and laminar flow coupling calculation model on the basis of the step S3, setting the critical solid fraction of the Explo4 fusion cast explosive to be 0.95, the total calculation step number to be 7500 steps and the calculation stop temperature to be 30 ℃, forming a calculation parameter file, and calling a solver to execute calculation.
The modeling in the embodiment has strong pertinence, wide applicable pressure range and convenient adjustment of calculation parameters, and can provide reference and reference for fusion-cast explosive process simulation.
Although the invention has been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.

Claims (5)

1. A modeling method for a cast process of fused cast explosive pressurization is characterized by comprising the following steps:
s1, constructing a pretreatment model, constructing geometric models of all parts of a fusion-cast explosive pressurizing and casting system by adopting modeling software Workbench design model, wherein the geometric models comprise a pressurizing mould, a casting piece, a casting channel and a cooling channel, guiding the pressurizing mould, the casting piece, the casting channel and the cooling channel geometric models into a VisualCAST component, carrying out trimming and assembling operations to form a combined entity structure, and dividing a calculation grid for the combined entity structure by using a Visualmesh component to obtain a pressurizing and casting process calculation model;
s2, introducing material parameters which comprise density, heat conduction coefficient and specific heat capacity to the pressing die, the casting die and the casting respectively on the basis of the calculation model obtained in the step S1;
s3, initial and boundary conditions are specified, and initial conditions including casting speed, casting pressure and casting temperature are specified for the casting channel in the calculation model obtained in the step S1; specifying boundary conditions for the cooling channel, including cooling medium and convective heat transfer coefficient; specifying boundary conditions for the pressurizing die, including a pressurizing pressure range and a pressurizing duration;
and S4, setting control parameters, setting the control model as a heat conduction and laminar flow coupling calculation model on the basis of the step S3, setting the control parameters including a critical solid fraction, a total calculation step number and a calculation stop temperature, forming a calculation parameter file, and calling a demand solver to execute calculation.
2. The modeling method for the pressurized casting process of the fused cast explosive according to claim 1, wherein in the step S1, the type of the divided computational mesh is tetrahedral computational mesh.
3. The method for modeling the pressurized casting process of a molten and cast explosive according to claim 1, wherein in step S2, the material of the pressurizing mold is stainless steel, the material of the casting mold is copper or stainless steel, and the casting is the molten and cast explosive.
4. The modeling method for the pressurized casting process of the fused cast explosive according to claim 1, wherein in the step S3, the pressurizing pressure is in the range of 0.3MPa to 1.0MPa.
5. The method for modeling the pressurized casting process of a molten and cast explosive according to claim 1, wherein in step S4, the critical solid fraction ranges from 0.1 to 0.95.
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