CN115338422A - Additive manufacturing method of multilayer shaped charge liner coating for improving after-damage pressure - Google Patents
Additive manufacturing method of multilayer shaped charge liner coating for improving after-damage pressure Download PDFInfo
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- CN115338422A CN115338422A CN202210762196.2A CN202210762196A CN115338422A CN 115338422 A CN115338422 A CN 115338422A CN 202210762196 A CN202210762196 A CN 202210762196A CN 115338422 A CN115338422 A CN 115338422A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/10—Formation of a green body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
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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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/10—Pre-treatment
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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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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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
- B33Y80/00—Products made by additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
- C23C24/045—Impact or kinetic deposition of particles by trembling using impacting inert media
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
- B22F2007/042—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal characterised by the layer forming method
Abstract
The invention relates to an additive manufacturing method of a multilayer liner coating for improving the after-damage effect pressure, belonging to the field of additive manufacturing; the method comprises the following specific steps: step 1: fixing the top end and the bottom end of the liner by using clamps respectively, and then installing the liner at the output end of the driving module; step 2: putting metal powder to be sprayed into a cold spraying powder feeding device, adjusting the position of a spray gun, and setting cold spraying process parameters; and step 3: starting a driving module to control the liner to rotate around the central axis of the liner; simultaneously starting a cold spraying powder feeding device, and preparing a coating on the surface of the shaped charge liner through a spray gun; and 4, step 4: and machining the coating of the multi-layer liner prepared by cold spraying according to the process requirements to obtain the multi-layer liner meeting the design size requirement. The invention can prepare the coating with uniform thickness on the surface of the shaped charge liner with various formed cross-sectional shapes, thereby avoiding the problems of difficult and uneven coating formation.
Description
Technical Field
The invention belongs to the field of additive manufacturing, and particularly relates to an additive manufacturing method of a multi-layer liner coating for improving the after-damage pressure.
Background
The liner is a core component of the armor-breaking warhead, and the structure and the material of the liner are closely related to the level of the armor-breaking capacity of the warhead. Most of the existing liner structures for penetration are thin-wall conical shells, and after the explosive is detonated, the liner converges towards an axis at an extremely high speed under the energy-gathering effect to form a high-speed high-pressure fluid which acts on a damaged target to realize penetration. In recent years, the upgrade of armor weapons to protection has placed higher demands on penetration and destruction performance of armor-piercing weapons. The traditional single-layer liner material mainly comprises red copper, the jet flow part is formed by a small part of inner layer metal at the front end of the liner and only accounts for 14-20% of the mass of the liner, the material utilization rate is not high, and the energy conversion mechanism is unreasonable, so that the double-layer liner becomes a hot spot of people. The double-layer shaped charge liner is characterized in that two metals are distributed and arranged in a certain proportion in the wall thickness direction, and in the nail cracking process, due to the fact that the materials are different in property, the inner layer material forms jet flow, and the outer layer material forms a pestle body, so that heavy metal materials can be reduced, the cost can be reduced, energy loss can be reduced, and the jet flow part can obtain higher speed. The outer layer material needs to have suitable acoustic impedance, good ductility, lower density, etc. to reduce energy loss and form a continuous fluid. Common outer layer materials are aluminum, nickel, titanium, and the like. Currently, most researches are carried out on aluminum-copper double-layer shaped charge liners, wherein the outer layer is made of aluminum, and the inner layer is made of copper. The aluminum is an energetic material, and when the jet flow partially penetrates a target, the aluminum can generate a strong chemical reaction at a high temperature to release a large amount of energy, so that the jet flow has certain damage capability performance while the temperature and the speed of the jet flow are improved.
The preparation technology of the multilayer shaped charge liner mainly comprises a powder spinning method, an electroforming method, a vapor deposition method, laser cladding and the like. The problems of poor tissue and mechanical property and the like caused by uneven powder distribution can occur when the medicine-shaped cover is prepared by a powder spinning method; the electroforming method and the vapor deposition method have the defects of low efficiency, difficult batch production and the like when preparing the multilayer shaped charge liner, and the technology for preparing a pure aluminum layer on a copper matrix by the electroforming method is not mature because the aluminum and the copper poles are easy to generate galvanic corrosion, and the problem of uneven forming exists when preparing a coating on a curved surface by the vapor deposition method; the laser cladding technology has great heat influence on the matrix, so that the matrix is deformed, and the defects of deflection, uneven residual stress and the like are generated. These unsolved problems severely limit the preparation and application of multilayer liners.
The prior art proposes to adopt a cold spraying technology to prepare an Al-based energetic active metal liner, but the method is to prepare an Al-based coating on the surface of a profiling matrix by cold spraying, and then the profiling matrix needs to be processed, so that the method is only suitable for preparing the liner by turning forming, reduces the utilization rate of liner materials, and is not suitable for the liner prepared by processes such as stamping forming, spinning forming, forging forming, electroforming and the like.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides a material increase manufacturing method of a multilayer shaped charge liner coating for improving the after-damage pressure. The method has the advantages of high working efficiency, saving liner materials, reducing time and material cost, small heat influence on the matrix by a cold spraying method, small matrix deformation, easy thickness control and low porosity of the coating, can meet the preparation requirements of coatings with various section shapes such as conical curved surfaces and the like, and has good potential in the aspect of preparing multilayer liners. Meanwhile, the problems of difficult coating preparation, uneven forming, large matrix deformation and the like in the process of preparing the double-layer liner on the basis of the formed liner are solved. The multilayer liner prepared by the method can generate higher post-damage pressure effect and improve the damage capability to the target.
The technical scheme of the invention is as follows: a multi-layer shaped charge liner coating additive manufacturing method for improving the after-damage effect pressure comprises the following specific steps:
step 1: fixing the top end and the bottom end of the liner by using clamps respectively, and then installing the liner at the output end of the driving module;
step 2: putting metal powder to be sprayed into a cold spraying powder feeding device, adjusting the position of a spray gun, and setting cold spraying process parameters;
and step 3: starting a driving module to control the liner to rotate around the central axis of the liner; simultaneously starting a cold spraying powder feeding device, and preparing a coating on the surface of the shaped charge liner through a spray gun;
and 4, step 4: and machining the coating of the multi-layer liner prepared by cold spraying according to the process requirements to obtain the multi-layer liner meeting the design size requirement.
The further technical scheme of the invention is as follows: the liner is conical, and the thickness and the size of the liner are not limited.
The invention further adopts the technical scheme that: the clamp clamping surface is in clearance fit with the surface of the liner, the size difference is less than 0.5mm, and the coaxial tolerance in the rotation process of the liner is less than 0.2mm.
The further technical scheme of the invention is as follows: in the step 1, firstly, the copper shaped charge liner and the clamp are cleaned and dried, and then the top end and the bottom end of the shaped charge liner are respectively fixed by the clamp;
the cleaning mode is that pure acetone reagent is adopted to carry out ultrasonic cleaning so as to remove pollutants such as oil stains on the surfaces of the shaped charge liner and the clamp, and the cleaned shaped charge liner is placed into a drying box to be dried.
The further technical scheme of the invention is as follows: the particle shape of the metal powder is spherical or nearly spherical, and the particle diameter is 10-60 mu m.
The further technical scheme of the invention is as follows: the spray gun is positioned at the initial position of the spraying surface of the liner, the included angle between the axial direction of the spray gun and the tangential direction of the surface of the liner is 80-90 degrees, the water cooling device is added to the whole spray gun, and the distance between the outlet surface of the spray gun and the surface of the liner is 10-40 mm.
The further technical scheme of the invention is as follows: the particle shape of the metal powder is 15-32 mu m; the axial direction of the spray gun and the tangential included angle of the surface of the shaped charge cover are 90 degrees, and the distance between the surface of the spray gun outlet and the surface of the shaped charge cover is 30mm.
The further technical scheme of the invention is as follows: the cold spraying working gas is nitrogen, the gas pressure is 1.0MPa to 4.0MPa, and the gas preheating temperature is 200 ℃ to 500 ℃; the moving speed of the spray gun is 5 mm/s-50 mm/s, the rotating speed of the substrate is 100 r/min-1000 r/min, and the aim is to form a continuous and compact coating.
The further technical scheme of the invention is as follows: the driving module comprises an engine and a three-jaw chuck, and the clamp fixed with the shaped charge liner is connected with an output shaft of the engine through the three-jaw chuck, so that the shaped charge liner and the clamp are driven to rotate.
The further technical scheme of the invention is as follows: the mechanical processing mode is turning processing, and the feed speed and the single-pass feed depth are determined according to the coating thickness and the processing requirements; conventionally selecting the feed speed to be 0.1 mm/s-1.0 mm/s and the single-pass feed depth to be 0.1 mm-0.5 mm.
Advantageous effects
The invention has the beneficial effects that: the additive manufacturing method of the multilayer liner coating provided by the invention can be used for preparing coatings with uniform thickness on the surfaces of the formed liners with various cross sections. Through the axial fixation of the clamps at the front end and the rear end of the shaped charge liner, the coaxiality error of the shaped charge liner in the rotating process is within 0.2mm, the rotating speed and the advancing speed of the shaped charge liner and the cold spraying process parameters are well controlled in the cold spraying process, the coating with uniform thickness is prepared, and the problems of difficult coating forming and uneven coating forming are avoided.
The coating has uniform performance, high preparation efficiency and small influence on the deformation of the matrix. The melting point of pure aluminum powder is low, the density is low, the preheating temperature of cold spraying gas is too high, and the powder can be blocked at the throat part of a powder feeding needle or a spray gun, so that the powder is not uniformly discharged or the gun is blocked; in the embodiment of the invention, the gas preheating temperature is controlled to be about 300 ℃ in the cold spraying process, so that the uniform powder discharge from the nozzle of the spray gun is ensured, and the performance difference of the coating at different distances from the substrate is small. The spray gun water-cooling device has the advantages that the powder outlet is vertical to the surface of the matrix and is 30mm away from the matrix, so that the powder deposition efficiency is improved, and the thermal deformation influence of overhigh heat on the matrix is avoided.
Reduces the waste of the liner material and saves the time and material cost in the processing process. The cutting method and the double-layer liner can waste base materials, but spinning and electroforming methods and the like are suitable for preparing single-layer liners, the multilayer liner is prepared on the basis of the formed single-layer liner, waste caused by cutting of the base materials is avoided, the coating is prepared quickly and efficiently, and only the subsequent coating needs to be processed.
The coating of different single metal materials or multi-metal composite materials, including aluminum, nickel, titanium and other metal or alloy powder, is prepared on the elementary substance copper shaped charge liner substrate. The preparation can be realized by only uniformly mixing the metal powder according to the designed proportion of the coating and regulating and controlling the cold spraying process parameters, and the production efficiency is high and the application range is wide. When the multi-layer liner provided by the invention acts at the end point of ammunition, the multi-layer liner can not only effectively penetrate through the protective layer of an armored target, but also can generate larger effective after-effect pressure, and the damage capability of the ammunition to the target is improved.
Drawings
FIG. 1 is a pure copper liner;
FIG. 2 is a schematic view of a cold spray operation with a clamp in place;
FIG. 3 is a view showing an aluminum-copper double liner (for example, 2mm thick) prepared by cold spray in example 1;
FIG. 4 is a partial three-dimensional depth map of the surface of the Al-Cu dual-layer liner of example 1;
FIG. 5 is an optical micrograph (250X) of the aluminum coating of example 1;
FIG. 6 is a schematic view of a two-layer liner made of aluminum copper (0.5 mm thick for example) in example 2 by cold spray;
FIG. 7 is a partial three-dimensional depth map of the surface of the dual layer liner of example 2;
FIG. 8 is an optical micrograph (250X) of the aluminum coating of example 2;
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1:
taking an aluminum-copper double-layer liner coating as an example, the additive manufacturing of the multi-layer liner coating is carried out according to the following steps:
(1) And cleaning the simple substance copper liner and the clamp to remove surface stains, wherein the pure copper liner is shown in figure 1. The two ends of the shaped charge liner are fixed by clamps, and the working schematic diagram of cold spraying under the clamping of the clamps is shown in figure 2. The clamps at the two ends are connected with the three-jaw chuck to control the rotation of the shaped charge liner.
The liner is conical, the diameter of the top end is 3mm, the diameter of the bottom end is 28mm, the angle of the taper angle is 50 degrees, and the thickness of the liner is 0.7mm.
The clamp is made of polyethylene, the machining size of the clamp is in clearance fit with the shaped charge liner, and the size difference is less than 0.5mm. The coaxial error of the liner in the rotating process is within 0.5mm.
The cleaning mode is that pure acetone reagent is adopted for ultrasonic cleaning to remove pollutants such as oil stains on the surfaces of the shaped charge liner and the clamp, the cleaning temperature is 25 ℃, the cleaning time is 15min, the shaped charge liner is placed into a drying box after ultrasonic cleaning, the set temperature is 80 ℃, and the drying time is 20min.
(2) 250g of pure aluminum powder is put into a cold spraying powder feeding device, the position of a spray gun is adjusted, the movement path of the spray gun is set, technological parameters such as the pressure of cold spraying working gas, the preheating temperature of the gas, the moving speed of the spray gun, the rotating speed of a shaped charge liner and the like are regulated and controlled, and a pure aluminum coating is prepared on the surface of the shaped charge liner.
The pure aluminum powder is spherical, and the particle size of the powder is 30-60 mu m.
The whole length of the spray gun is 250mm, the length of the contraction section is 30mm, and the length of the expansion section is 220mm.
The moving speed of the spray gun is 5mm/s, the rotating speed of the liner is 100r/min, and the spray gun is 30mm away from the surface of the liner and is vertical to the surface of the liner.
The cold spraying working gas is nitrogen, the gas pressure is 2.6MPa, the gas preheating temperature is 300 ℃, the feeding rate is 3.0g/min, the spraying is performed once, and the thickness of the coating is 2mm.
(3) And machining the coating prepared by cold spraying according to the requirements of size, roughness and the like to obtain the aluminum-copper double-layer shaped charge liner which meets the design size requirement, has low porosity of the coating and uniform tissue.
The mechanical processing method is turning processing, and mainly adjusts the thickness of the coating, the feed speed of a turning tool is 0.2mm/s, and the feed depth is 0.3mm.
The liner prepared by the cold spray technique in this example is shown in fig. 3, and the overall thickness of the coating is visually uniform, with a bottom thickness of 2mm. And (3) taking a picture of the three-dimensional depth of the surface of the shaped charge liner under a light mirror, wherein the change of the integral depth is within 0.83mm, the change of the thickness of the coating is small, and the depth is within the normal range of the coating prepared by cold spraying, as shown in figure 4. Taking a metallographic sample prepared from part of the coating and the matrix, polishing, and observing the porosity under a light mirror, wherein the measured porosity is shown in figure 5<0.7 percent; the average microhardness of the coating at a position 0.2mm away from the substrate is 54HV 0.05 At 0.7mm from the substrate, the average microhardness of the coating is 52HV 0.05 The coating performance is more uniform; the bonding strength of the coating and the substrate measured by adopting a bonding and stretching method is 16.8MPa, and the mechanical property of the coating is good. The liner can penetrate armor steel plate with 0.5 times of charge caliber under 1 time of explosive height, and generates 0.5MPa in 1 cubic meter of closed spaceThe peak overpressure of the pure copper liner is larger than the lethal peak overpressure threshold value of-0.1 MPa which has the vitality of human beings and the like, and the comprehensive damage power performance of the pure copper liner to the target is improved.
Example 2:
taking an aluminum-copper double-layer liner coating as an example, the additive manufacturing of the multi-layer liner coating is carried out according to the following steps
(1) And cleaning the simple substance copper shaped charge liner and the clamps, fixing the simple substance copper shaped charge liner at two ends by adopting the clamps, connecting the clamps at the two ends with the three-jaw chuck, and controlling the rotation of the shaped charge liner.
The liner, jig and wash and dry were the same as in example 1.
(2) Adjusting the position of a spray gun, setting a movement path of the spray gun, regulating and controlling technological parameters such as the pressure of cold spraying working gas, the preheating temperature of the gas, the moving speed of the spray gun, the rotating speed of the shaped charge liner and the like, and preparing a pure aluminum coating on the surface of the shaped charge liner.
The pure aluminum powder was in accordance with example 1.
The spray gun was identical to that of example 1.
The moving speed of the spray gun is 10mm/s, the rotating speed of the liner is 200r/min, and the spray gun is 30mm away from the surface of the liner and is vertical to the surface of the liner.
The cold spraying working gas is nitrogen, the gas pressure is 2.4MPa, the gas preheating temperature is 300 ℃, the feeding rate is 1.5g/min, the spraying is performed once, and the thickness of the coating is 0.5mm.
(3) And machining the coating prepared by cold spraying according to the requirements of size, roughness and the like to obtain the aluminum-copper double-layer shaped charge liner which meets the design size requirement, has low porosity of the coating and uniform tissue.
The mechanical processing method is turning processing, mainly adjusting the thickness of the coating, and the coating prepared in the example is thin, so the feed speed of the turning tool is set to be 0.1mm/s, and the feed depth is set to be 0.1mm.
The liner prepared by the cold spray technique in this example is shown in fig. 6, and the overall thickness of the coating is visually uniform, with a bottom coating thickness of 0.5mm. Taking a photograph of the surface of the liner with three-dimensional depth under a light lens, as shown in FIG. 7The overall depth variation was within 0.57mm and the coating thickness was relatively uniform. Taking a metallographic sample prepared from part of the coating and the matrix, polishing, and observing the porosity under a light mirror, wherein the measured porosity is shown in figure 8<0.1 percent. The average microhardness of the coating at a position 0.1mm away from the substrate is 60HV 0.05 At 0.4mm from the substrate, the average microhardness of the coating is 54HV 0.05 The coating performance is more uniform; the bonding strength of the coating and the matrix is measured to be 20.5MPa by adopting a bonding and stretching method, and the mechanical property of the coating is good. The liner can penetrate through an armored steel plate with 0.5 times of charging caliber under the condition of 1.2 times of explosive height, and generates 0.4MPa peak overpressure in a closed space of 1 cubic meter, which is close to the lethal peak overpressure threshold value having vitality to people and the like, and the comprehensive damage power performance of the pure copper liner to a target is improved.
The total time of example 1 and example 2 is within 40 minutes, wherein the time of cold spraying for preparing the coating is 5 minutes, and the two examples consume 80g of pure aluminum powder.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A multi-layer shaped charge liner coating additive manufacturing method for improving the after-damage effect pressure is characterized by comprising the following specific steps:
step 1: fixing the top end and the bottom end of the liner by using clamps respectively, and then installing the liner at the output end of the driving module;
step 2: putting metal powder to be sprayed into a cold spraying powder feeding device, adjusting the position of a spray gun, and setting cold spraying process parameters;
and step 3: starting a driving module to control the liner to rotate around the central axis of the liner; simultaneously starting a cold spraying powder feeding device, and preparing a coating on the surface of the shaped charge liner through a spray gun;
and 4, step 4: and machining the coating of the multi-layer liner prepared by cold spraying according to the process requirements to obtain the multi-layer liner meeting the design size requirement.
2. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: the liner is conical, and the thickness and the size of the liner are not limited.
3. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: the clamping surface of the clamp is in clearance fit with the surface of the liner, the size difference is less than 0.5mm, and the coaxial tolerance in the rotation process of the liner is less than 0.2mm.
4. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: in the step 1, firstly, the copper shaped charge liner and the clamp are cleaned and dried, and then the top end and the bottom end of the shaped charge liner are respectively fixed by the clamp;
the cleaning mode is that pure acetone reagent is adopted to carry out ultrasonic cleaning so as to remove pollutants on the surfaces of the shaped charge liner and the clamp, and the shaped charge liner and the clamp are dried in a drying box after being cleaned.
5. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: the particle shape of the metal powder is spherical or nearly spherical, and the particle diameter is 10-60 mu m.
6. The method for additive manufacturing of a multilayer liner coating for increasing the after-failure stress according to any one of claims 1 to 5, wherein: the spray gun is positioned at the initial position of the spraying surface of the liner, the included angle between the axial direction of the spray gun and the tangential direction of the surface of the liner is 80-90 degrees, the water cooling device is added to the whole spray gun, and the distance between the outlet surface of the spray gun and the surface of the liner is 10-40 mm.
7. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 6, wherein: the particle shape of the metal powder is 15-32 mu m; the included angle between the axial direction of the spray gun and the tangential direction of the surface of the shaped charge liner is 90 degrees, and the distance between the surface of the spray gun outlet and the surface of the shaped charge liner is 30mm.
8. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: the cold spraying working gas is nitrogen, the gas pressure is 1.0MPa to 4.0MPa, and the gas preheating temperature is 200 ℃ to 500 ℃; the moving speed of the spray gun is 5 mm/s-50 mm/s, the rotating speed of the substrate is 100 r/min-1000 r/min, and the aim is to form a continuous and compact coating.
9. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: the driving module comprises an engine and a three-jaw chuck, and the clamp fixed with the shaped charge liner is connected with an output shaft of the engine through the three-jaw chuck, so that the shaped charge liner and the clamp are driven to rotate.
10. The method of additive manufacturing of a multilayer liner coating for increasing the after-effect pressure of a damage according to claim 1, wherein: the mechanical processing mode is turning processing, and the feed speed and the single-pass feed depth are determined according to the coating thickness and the processing requirements; conventionally selecting the feed speed to be 0.1 mm/s-1.0 mm/s and the single-pass feed depth to be 0.1 mm-0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210762196.2A CN115338422A (en) | 2022-06-29 | 2022-06-29 | Additive manufacturing method of multilayer shaped charge liner coating for improving after-damage pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210762196.2A CN115338422A (en) | 2022-06-29 | 2022-06-29 | Additive manufacturing method of multilayer shaped charge liner coating for improving after-damage pressure |
Publications (1)
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