CN113666793B - Binary fusion cast explosive and additive preparation process - Google Patents
Binary fusion cast explosive and additive preparation process Download PDFInfo
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- CN113666793B CN113666793B CN202110855983.7A CN202110855983A CN113666793B CN 113666793 B CN113666793 B CN 113666793B CN 202110855983 A CN202110855983 A CN 202110855983A CN 113666793 B CN113666793 B CN 113666793B
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B25/00—Compositions containing a nitrated organic compound
- C06B25/34—Compositions containing a nitrated organic compound the compound being a nitrated acyclic, alicyclic or heterocyclic amine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
- C06B21/0033—Shaping the mixture
- C06B21/005—By a process involving melting at least part of the ingredients
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Abstract
The invention provides a double-element fusion-cast explosive and an additive preparation process, wherein the double-element fusion-cast explosive is coaxially charged with an inner layer and an outer layer, the inner layer is filled with TNT-based high-energy explosive, and the outer layer is filled with DNAN-based high-safety explosive; TNT-based high explosive: 15-25% of TNT, 75-85% of HMX and 0-5% of microcrystalline wax; DNAN-based high safety explosives: 15-25% of DNAN, 75-85% of HMX and 0-5% of microcrystalline wax. The mass ratio of the inner-layer charge to the outer-layer charge is 1: 1. The binary fusion cast explosive has high energy level, and compared with Octol, the detonation velocity is improved by more than 2.9 percent, and the energy density is improved by more than 3.8 percent; the explosive disclosed by the invention is low in sensitivity, high in self-ignition temperature, and safe to use in a fighting part, and the violent response degree of the roasting combustion is combustion. The preparation process disclosed by the invention is formed by additive manufacturing, has the characteristics of simple preparation process, safety, reliability, capability of forming a complex structure and the like, and is good in forming density consistency and high in precision.
Description
Technical Field
The invention belongs to the field of explosives, relates to additive preparation, and particularly relates to a binary fusion-cast explosive and an additive preparation process.
Background
In military mixed explosives, the fusion cast explosives have the advantages of high energy level, good process adaptability, low cost and the like, and are widely equipped in various military troops at present. The Octol (TNT/HMX) explosive is a typical representative of metal accelerated casting explosives, has the advantages of high detonation velocity, large energy density and the like, is widely applied to a killing part of battle and an energy gathering part of battle, but has poor safety performance, is easy to generate a phenomenon of combustion-to-detonation under thermal stimulation, is difficult to meet the requirement of the current high-energy blunt-feeling part of battle, and limits the further popularization and application of the explosive.
In 1987, french dynamite company first proposed the concept of dual compound explosive charging in order to accommodate the policy of insensitive ammunition (IM). The double-element compound explosive charging means a charging method using two compound explosives in an inner and outer layer charging structure form, different charging structures can be adopted according to the characteristics of a damage target or the requirement of insensitivity of ammunition, and the explosive damage performance of the ammunition is effectively improved or the vulnerability of the ammunition is reduced. The present preparation process of double-component composite explosive adopts a casting explosive column respectively forming method, i.e. firstly, the molten slurry of explosive formula of inner layer is poured into an inner layer open-close mould to form, after solidification, the explosive column is placed in the middle of the outer layer open-close mould, the molten slurry of explosive formula of outer layer is poured into the outer layer open-close mould to form, after the inner layer explosive column and the outer layer explosive column are solidified together, the explosive column is trimmed to form the double-component composite explosive with required size.
The process is still based on the traditional casting forming method, and has the key problems of low solid content, complex post-processing treatment, position deviation of the inner-layer explosive column and the like, particularly the inner-layer explosive column is difficult to position and cannot be accurately placed in the center of the outer-layer mold, the inner-layer explosive column is easy to shift in the outer-layer explosive slurry casting process, and coaxial explosive charging of the inner layer and the outer layer cannot be realized. Therefore, the traditional preparation process of the binary composite explosive is limited by the technical level and the equipment level and is difficult to obviously improve.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a binary fusion cast explosive to solve the technical problem that the energy level of the fusion cast explosive in the prior art needs to be further improved.
The invention also provides an additive preparation process of the binary fusion cast explosive, which aims to solve the technical problem that the traditional preparation process in the prior art has more limitation conditions.
In order to solve the technical problems, the invention adopts the following technical scheme:
a double-element fusion-cast explosive is characterized in that the double-element fusion-cast explosive is coaxially charged with an inner layer and an outer layer, wherein the inner layer is filled with TNT-based high-energy explosive, and the outer layer is filled with DNAN-based high-safety explosive;
the TNT-based high-energy explosive consists of the following raw materials in percentage by mass: 15-25% of TNT, 75-85% of HMX, 0-5% of microcrystalline wax and 100% of the total weight percentage of the raw materials;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: 15-25% of DNAN, 75-85% of HMX, 0-5% of microcrystalline wax and 100% of the total weight percentage of the raw materials.
The invention also has the following technical characteristics:
preferably, the mass ratio of the inner-layer charge to the outer-layer charge is 1: 1.
Preferably, the TNT-based high-energy explosive consists of the following raw materials in percentage by mass: 16 to 20 percent of TNT, 78 to 83 percent of HMX, 1 to 2 percent of microcrystalline wax, and the sum of the weight percentages of the raw materials is 100 percent;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: 15-20% of DNAN, 78-83% of HMX and 2% of microcrystalline wax, wherein the sum of the weight percentages of the raw materials is 100%.
More preferably, the TNT-based high-energy explosive consists of the following raw materials in percentage by mass: TNT 18%, HMX 80%, microcrystalline wax 2%;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: DNAN was 18%, HMX was 80%, and microcrystalline wax was 2%.
The invention also provides an additive manufacturing process of the double-element fusion-cast explosive, the process adopts the formula and the charging structure of the double-element fusion-cast explosive, and the process obtains the inner-layer and outer-layer double-element fusion-cast explosive forming explosive columns by stacking layer by layer through an additive manufacturing forming process.
Specifically, the process comprises the following steps:
step one, three-dimensional modeling:
firstly, 3D modeling is carried out on the size of a grain to be molded by adopting three-dimensional software to generate an STL data file, then the data file is imported into 3D printing slicing software for slicing to obtain code data which can be identified by the 3D printing control software, the 3D printing control software is opened, and the slicing data of a target sample is imported for standby;
step two, formula melting and mixing:
the temperature of the first storage tank is set to be 110 ℃, raw materials are added according to the raw material proportion of the outer-layer-charged DNAN-based high-safety explosive, after the raw materials are fully mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared; the temperature of the second storage tank is set to be 100 ℃, raw materials are added according to the raw material proportion of the TNT-based high-energy explosive filled in the inner layer, after the raw materials are fully and uniformly mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared;
step three, extruding by a nozzle:
the method comprises the following steps that a first spray head is connected with a first storage tank, a second spray head is connected with a second storage tank, the extrusion speed, the layering thickness, the heat preservation temperature, the diameter of the spray head and the air pressure of the first spray head and the second spray head are set, a host is started, a three-dimensional motion platform is instructed to move to the position below the first extrusion spray head, materials are transmitted to a printing spray head from the storage tank, and a printing test is started;
step four, printing by platform motion:
after the air pressure is started, the first nozzle starts to extrude a fused material of the DNAN-based high-safety explosive to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and molding of the annular area of the outer layer material of the layer 1;
after the outer layer material of the layer 1 is printed, the platform is moved to the position below a second spray head, the second spray head begins to extrude the TNT-based high-energy explosive molten material to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and forming of the annular area of the inner layer material of the layer 1;
step five, alternately and gradually laminating and adding:
and the three-dimensional motion platform realizes additive manufacturing and forming through downward feeding in the Z-axis direction, alternate printing operation of the next layer is carried out, the thin layers are manufactured and overlapped layer by layer in this way until a set printing process is finished, and printing is stopped, so that the inner-layer and outer-layer binary casting explosive forming columns are obtained.
Compared with the prior art, the invention has the following technical effects:
the binary fusion cast explosive disclosed by the invention has high energy level, and compared with Octol, the detonation velocity is improved by more than 2.9%, and the energy density is improved by more than 3.8%.
The explosive disclosed by the invention is low in sensitivity, high in self-ignition temperature, and capable of being safely used in a fighting department, and the violent response degree of the roasting combustion is combustion.
(III) the binary fusion cast explosive is mainly used in the field of EFP, armor-breaking warhead, blasting warhead, torpedo and anti-air back-conduction warhead.
(IV) the preparation process has good stability, good coaxiality of the inner layer and the outer layer, uniform density of the upper layer and the lower layer, and can realize the charging of the shell with a complex shape.
The preparation process of the invention adopts additive manufacturing molding, and has the characteristics of simple preparation process, safety, reliability, capability of molding complex structures and the like, good consistency of molding density and high precision.
The present invention will be explained in further detail with reference to examples.
Detailed Description
Based on the condition of the prior art recorded in the background technology, if a binary fusion cast explosive which has high solid phase content, is suitable for forming an internal and external coaxial complex structure, has high forming precision and high intrinsic safety can be developed, a plurality of problems in the traditional fusion casting process can be effectively solved, the solid phase content is improved, and a technological solution for research can be provided for detonation energy release characteristic research, direct and rapid forming of warhead grains and the like.
It is to be understood that all materials, devices, and software known in the art may be used in the present invention without specific recitation. For example, three-dimensional software, 3D printing and slicing software and 3D printing control software adopted by 3D modeling are all common software in the field of 3D printing.
The specification requirements of the raw materials are as follows:
TNT, the Chinese name of which is "TNT", is the abbreviation of trinitrotoluene explosive, and the TNT is prepared by adopting TNT commonly used in the field.
HMX, the Chinese name of which is HMX, and HMX can be HMX which is commonly used in the field.
DNAN is the abbreviation of 2, 4-dinitroanisole explosive, and 2, 4-dinitroanisole commonly used in the field can be adopted.
Microcrystalline wax an 80# microcrystalline wax is used as is known in the art.
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention.
Example 1:
the embodiment provides a double-element fusion cast explosive, which is coaxially charged with an inner layer and an outer layer, wherein the inner layer is filled with TNT-based high-energy explosive, and the outer layer is filled with DNAN-based high-safety explosive;
the mass ratio of the inner-layer charge to the outer-layer charge is 1: 1.
The TNT-based high-energy explosive consists of the following raw materials in percentage by mass: TNT 18%, HMX 80%, microcrystalline wax 2%;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: DNAN was 18%, HMX was 80%, and microcrystalline wax was 2%.
In the additive manufacturing process of the binary fused cast explosive of the embodiment, the inner-layer and outer-layer binary fused cast explosive forming explosive columns are obtained by stacking layer by layer through an additive manufacturing and forming process. Specifically, the process comprises the following steps:
step one, three-dimensional modeling:
firstly, 3D modeling is carried out on the size of a grain to be molded by adopting three-dimensional software to generate an STL data file, then the data file is imported into 3D printing slicing software for slicing to obtain code data which can be identified by the 3D printing control software, the 3D printing control software is opened, and the slicing data of a target sample is imported for standby;
step two, formula melting and mixing:
the temperature of the first storage tank is set to be 110 ℃, raw materials are added according to the raw material proportion of the outer-layer-charged DNAN-based high-safety explosive, after the raw materials are fully mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared; the temperature of the second storage tank is set to be 100 ℃, raw materials are added according to the raw material proportion of the TNT-based high-energy explosive filled in the inner layer, after the raw materials are fully and uniformly mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared;
step three, extruding by a nozzle:
the method comprises the following steps that a first spray head is connected with a first storage tank, a second spray head is connected with a second storage tank, the extrusion speed, the layering thickness, the heat preservation temperature, the diameter of the spray head and the air pressure of the first spray head and the second spray head are set, a host is started, a three-dimensional motion platform is instructed to move to the position below the first extrusion spray head, materials are transmitted to a printing spray head from the storage tank, and a printing test is started; in the step, the specific parameter setting can be set in a conventional way according to specific actual working conditions;
step four, printing by platform motion:
after the air pressure is started, the first nozzle starts to extrude a fused material of the DNAN-based high-safety explosive to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and molding of the annular area of the outer layer material of the layer 1;
after the outer layer material of the layer 1 is printed, the platform is moved to the position below a second spray head, the second spray head begins to extrude the TNT-based high-energy explosive molten material to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and forming of the annular area of the inner layer material of the layer 1;
step five, alternately and gradually laminating and adding:
and the three-dimensional motion platform realizes additive manufacturing and forming through downward feeding in the Z-axis direction, alternate printing operation of the next layer is carried out, the thin layers are manufactured and overlapped layer by layer in this way until a set printing process is finished, and printing is stopped, so that the inner-layer and outer-layer binary casting explosive forming columns are obtained.
The results of the performance tests of this example are shown in Table 1.
Example 2:
the embodiment provides a double-element fusion cast explosive, which is coaxially charged with an inner layer and an outer layer, wherein the inner layer is filled with TNT-based high-energy explosive, and the outer layer is filled with DNAN-based high-safety explosive;
the mass ratio of the inner-layer charge to the outer-layer charge is 1: 1.
The TNT-based high-energy explosive consists of the following raw materials in percentage by mass: TNT 16%, HMX 83%, microcrystalline wax 1%;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: DNAN 20%, HMX 78%, microcrystalline wax 2%.
The additive manufacturing process of the binary fused cast explosive of the embodiment is basically the same as that of the embodiment 1, and the difference is only that the formula proportion of the binary fused cast explosive is different.
The results of the performance tests of this example are shown in Table 1.
Example 3:
the embodiment provides a double-element fusion cast explosive, which is coaxially charged with an inner layer and an outer layer, wherein the inner layer is filled with TNT-based high-energy explosive, and the outer layer is filled with DNAN-based high-safety explosive;
the mass ratio of the inner-layer charge to the outer-layer charge is 1: 1.
The TNT-based high-energy explosive consists of the following raw materials in percentage by mass: 20% of TNT, 78% of HMX and 2% of microcrystalline wax;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: 15% DNAN, 83% HMX and 2% microcrystalline wax.
The additive manufacturing process of the binary fused cast explosive of the embodiment is basically the same as that of the embodiment 1, and the difference is only that the formula proportion of the binary fused cast explosive is different.
The results of the performance tests of this example are shown in Table 1.
Comparative example 1:
the comparative example provides a metal accelerated fusion cast explosive, Octol for short, which is prepared from the following raw materials in percentage by mass: TNT 25%, HMX 75%.
This comparative example serves to compare energy and safety with the present invention.
The preparation process of the metal accelerated fusion cast explosive of the comparative example adopts the traditional fusion cast process, and comprises the following specific steps:
step one, melting a carrier:
setting the temperature of the melt-mixing kettle to be 100 ℃, weighing the raw materials according to the ratio of the Octol explosive, adding TNT, heating, stirring and melting;
step two, formula melting and mixing:
after the TNT is melted, adding solid phase HMX in batches to prevent solid phase from combining and uniformly stirring and mixing;
step three, casting and curing:
preheating a mould to 60-70 ℃, pouring the slurry into the mould after the formula is melted and mixed, and naturally solidifying the slurry;
step four, dressing the explosive columns:
and (4) after the explosive column is solidified and cooled, taking out the explosive column, wherein the upper part of the explosive column is intact and the upper end of the explosive column is provided with a large number of shrinkage cavities, and machining by adopting a lathe to obtain the required explosive column.
Comparative example 2:
this comparative example shows a binary fused cast explosive of the same formulation and structure as in example 1. The comparative example differs from example 1 only in that the preparation process of the comparative example employs a conventional melt-cast process.
This comparative example serves to compare energy and safety with the present invention.
The specific steps of the traditional casting process adopted by the comparative example are as follows:
step one, inner layer explosive melting and mixing:
setting the temperature of a melt-mixing pot to 100 ℃, weighing raw materials according to the proportion of the TNT-based explosive of the inner layer, adding TNT and microcrystalline wax, heating, stirring and melting, adding solid-phase HMX in batches to prevent solid-phase combination blocks, and stirring and mixing uniformly;
step two, casting the inner explosive:
preheating an inner layer opening and closing mould to 60-70 ℃, pouring explosive slurry into the mould after the inner layer explosive is completely melted and mixed, and naturally solidifying the explosive slurry;
step three, finishing inner-layer grains:
after the inner-layer explosive columns are solidified and cooled, opening the opening and closing die, taking out the explosive columns, and processing and finishing by adopting a lathe to obtain the explosive columns required by the inner layer;
step four, fusing and mixing the outer explosive:
setting the temperature of a melt-mixing pot to be 110 ℃, weighing raw materials according to the proportion of outer-layer DNAN-based explosive, adding DNAN and microcrystalline wax, heating, stirring and melting, adding solid-phase HMX in batches to prevent solid-phase combination blocks, and stirring and mixing uniformly;
step five, casting of the outer explosive:
preheating an outer layer opening and closing mold to 60-70 ℃, placing an inner layer explosive column in the middle of the outer layer mold, enabling the inner layer explosive column and the outer layer mold to be coaxial as much as possible, pouring explosive slurry into an annular space between the inner layer explosive column and the outer layer mold after the outer layer explosive is completely molten and mixed, and naturally solidifying the explosive slurry;
step six, finishing the outer-layer grains:
and after the outer annular explosive column is solidified and cooled, taking out the explosive column, and finishing by adopting a lathe to obtain the coaxial binary fused cast explosive column.
And (3) performance testing:
the density of the drug column is tested by adopting GJB772A-1997 method 401.2.
Detonation velocity was tested using GJB772A-1997 method 702.1.
The burst heat was tested using GJB772A-1997 method 701.1.
The self-ignition temperature was measured using GJB772A-1997 method 505.1.
The thermal sensitivity test was performed using GJB772A-1997 method 508.1.
The performance data for the above examples and comparative examples are shown in table 1. As can be seen from examples 1-3 and comparative example 1 in Table 1, compared with the existing metal accelerated type cast explosive, the energy and the safety of the invention are improved: the detonation velocity is improved by 2.9-3.1%, the energy density is improved by 3.8-4.5%, the response intensity of the fire bomb is reduced from detonation to combustion, because the invention improves the solid content of the main explosive, and the low-sensitivity outer-layer explosive improves the safety of the whole explosive.
From the example 1 and the comparative example 2, under the condition of the same formula composition, compared with the mixed explosive prepared by the traditional process, the double-element fusion cast explosive prepared by the invention has the advantages of better process stability, higher grain quality, better energy and safety, 3.6% of explosion speed, 4.7% of energy density and 12.5% of self-ignition temperature. This is because the slurry of the present invention has increased viscosity and poor flowability, and the use of conventional fusion casting process will result in poor charging quality, while the increased viscosity is more favorable for additive manufacturing and molding.
TABLE 1 Table of Performance data for examples and comparative examples
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 (4)
1. A double-element fusion cast explosive is characterized in that the double-element fusion cast explosive is coaxially charged with an inner layer and an outer layer, wherein the inner layer is filled with TNT-based high-energy explosive, and the outer layer is filled with DNAN-based high-safety explosive;
the TNT-based high-energy explosive consists of the following raw materials in percentage by mass: 16 to 20 percent of TNT, 78 to 83 percent of HMX, 1 to 2 percent of microcrystalline wax, and the sum of the weight percentages of the raw materials is 100 percent;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: 15-20% of DNAN, 78-83% of HMX and 2% of microcrystalline wax, wherein the sum of the weight percentages of the raw materials is 100%;
the additive preparation process of the binary fusion cast explosive comprises the following steps:
step one, three-dimensional modeling:
firstly, 3D modeling is carried out on the size of a grain to be molded by adopting three-dimensional software to generate an STL data file, then the data file is imported into 3D printing slicing software for slicing to obtain code data which can be identified by the 3D printing control software, the 3D printing control software is opened, and slicing data of a target sample is imported for standby application;
step two, formula melting and mixing:
the temperature of the first storage tank is set to be 110 ℃, raw materials are added according to the raw material proportion of the outer-layer-charged DNAN-based high-safety explosive, after the raw materials are fully mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared; the temperature of the second storage tank is set to be 100 ℃, raw materials are added according to the raw material proportion of the TNT-based high-energy explosive filled in the inner layer, after the raw materials are fully and uniformly mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared;
step three, extruding by a nozzle:
the method comprises the following steps that a first spray head is connected with a first storage tank, a second spray head is connected with a second storage tank, the extrusion speed, the layering thickness, the heat preservation temperature, the diameter of the spray head and the air pressure of the first spray head and the second spray head are set, a host is started, a three-dimensional motion platform is instructed to move to the position below the first extrusion spray head, materials are transmitted to a printing spray head from the storage tank, and a printing test is started;
step four, printing by platform motion:
after the air pressure is started, the first nozzle starts to extrude a fused material of the DNAN-based high-safety explosive to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and molding of the annular area of the outer layer material of the layer 1;
after the outer layer material of the layer 1 is printed, the platform is moved to the position below a second spray head, the second spray head begins to extrude the TNT-based high-energy explosive molten material to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and forming of the annular area of the inner layer material of the layer 1;
step five, alternately and gradually laminating and adding:
and the three-dimensional motion platform realizes additive manufacturing and forming through downward feeding in the Z-axis direction, alternate printing operation of the next layer is carried out, the thin layers are manufactured and overlapped layer by layer in this way until a set printing process is finished, and printing is stopped, so that the inner-layer and outer-layer binary casting explosive forming columns are obtained.
2. A binary fused cast explosive according to claim 1 wherein the mass ratio of the inner charge to the outer charge is 1: 1.
3. The binary fused cast explosive according to claim 1, wherein the TNT-based high-energy explosive comprises the following raw materials in percentage by mass: TNT 18%, HMX 80%, microcrystalline wax 2%;
the DNAN-based high-safety explosive consists of the following raw materials in percentage by mass: DNAN was 18%, HMX was 80%, and microcrystalline wax was 2%.
4. A process for preparing the additive of dual-element fused cast explosive, which is characterized in that the process adopts the formula and the charging structure of the dual-element fused cast explosive as claimed in any one of claims 1 to 3, and the process is used for obtaining an inner-layer and outer-layer dual-element fused cast explosive forming explosive column by stacking layer by layer through an additive manufacturing forming process;
the process comprises the following steps:
step one, three-dimensional modeling:
firstly, 3D modeling is carried out on the size of a grain to be molded by adopting three-dimensional software to generate an STL data file, then the data file is imported into 3D printing slicing software for slicing to obtain code data which can be identified by the 3D printing control software, the 3D printing control software is opened, and the slicing data of a target sample is imported for standby;
step two, formula melting and mixing:
the temperature of the first storage tank is set to be 110 ℃, raw materials are added according to the raw material proportion of the outer-layer-charged DNAN-based high-safety explosive, after the raw materials are fully mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared; the temperature of the second storage tank is set to be 100 ℃, raw materials are added according to the raw material proportion of the TNT-based high-energy explosive filled in the inner layer, after the raw materials are fully and uniformly mixed, the stirring speed is set to be 5-10 rad/min, the slurry is prevented from settling, and printing is prepared;
step three, extruding by a nozzle:
the method comprises the following steps that a first spray head is connected with a first storage tank, a second spray head is connected with a second storage tank, the extrusion speed, the layering thickness, the heat preservation temperature, the diameter of the spray head and the air pressure of the first spray head and the second spray head are set, a host is started, a three-dimensional motion platform is instructed to move to the position below the first extrusion spray head, materials are transmitted to a printing spray head from the storage tank, and a printing test is started;
step four, printing by platform motion:
after the air pressure is started, the first nozzle starts to extrude a fused material of the DNAN-based high-safety explosive to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and molding of the annular area of the outer layer material of the layer 1;
after the outer layer material of the layer 1 is printed, the platform is moved to the position below a second spray head, the second spray head begins to extrude the TNT-based high-energy explosive molten material to a three-dimensional motion platform, and the three-dimensional motion platform moves along the XY axes at a set speed according to a set printing program to complete the printing and forming of the annular area of the inner layer material of the layer 1;
step five, alternately and gradually laminating and adding:
and the three-dimensional motion platform realizes additive manufacturing and forming through downward feeding in the Z-axis direction, alternate printing operation of the next layer is carried out, the thin layers are manufactured and overlapped layer by layer in this way until a set printing process is finished, and printing is stopped, so that the inner-layer and outer-layer binary casting explosive forming columns are obtained.
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| US4985093A (en) * | 1989-11-15 | 1991-01-15 | Explosive Research And Development Corporation | Melt cast explosives |
| FR2741437B1 (en) * | 1995-11-16 | 1997-12-19 | Poudres & Explosifs Ste Nale | METHOD OF MANUFACTURING EXPLOSIVE ELEMENT WITH CONTROLLED FRAGMENTATION |
| CN105315114B (en) * | 2014-06-10 | 2017-10-13 | 湖北航天化学技术研究所 | A kind of casting type azido plastic bonded explosive and preparation method thereof |
| CN108658710A (en) * | 2018-05-07 | 2018-10-16 | 中国工程物理研究院化工材料研究所 | A method of improving castexplosive mechanical property |
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