Emulsion explosive linear shaped charge device based on interface layer impedance matching and assembling method thereof

Abstract

The invention relates to the technical field of explosive materials, in particular to an emulsion explosive linear shaped charge device based on interface layer impedance matching and an assembling method of the emulsion explosive linear shaped charge device. The shaped charge device comprises an emulsion explosive charge body, a metal shaped charge cover and a composite interface layer, the composite interface layer is arranged between the emulsion explosive charge body and the metal shaped charge cover, and the composite interface layer is formed by compounding metal powder and a polymer binder according to the mass ratio of 7: 3-9: 1. According to the technical scheme, the detonation energy transfer efficiency and the jet cutting performance are improved through interface layer impedance matching and microstructure interlocking design, efficient transfer of detonation energy and remarkable improvement of the jet cutting performance are achieved, and efficient shaped charge cutting based on emulsion explosives is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of blasting materials, and in particular to an emulsion explosive linear shaped charge device based on interface layer impedance matching and an assembly method thereof. Background Art

[0002] As a core method for directed energy release, linear shaped charge technology has significant applications in engineering blasting, oil pipeline cutting, and military obstacle removal. This technology utilizes explosive detonation to drive a metal liner into a high-speed metal jet, achieving efficient target cutting. Existing technologies are primarily divided into two categories based on charge type: one employs high-energy military explosives (such as RDX and HMX), which have high detonation velocities (>8000 m / s) and high detonation pressures (>30 GPa), producing high-kinetic energy jets and significant cutting depths. The other employs low-yield industrial explosives (such as emulsion explosives). While these offer advantages such as low cost, high safety, and excellent impact resistance, their detonation velocities (approximately 4500-5500 m / s) and pressures (approximately 5-8 GPa) are only approximately one-half to one-sixth of those of high-energy explosives, resulting in insufficient jet velocity and limited cutting depth.

[0003] In engineering practice, high-energy explosive cutters, despite their excellent performance, are limited by their high cost, high mechanical sensitivity, and storage and transportation risks. Emulsion explosive cutters, while economical and safe, suffer from low energy transfer efficiency and insufficient jet kinetic energy, making them inadequate for cutting high-strength targets. Furthermore, the significant difference in wave impedance between traditional emulsion explosives and metal liners results in strong reflection of the detonation wave at the interface, weakening the energy-focusing efficiency.

[0004] Existing improvement schemes mostly focus on adjusting the geometric parameters of the liner and optimizing the explosive formulation. For example, the literature (Journal of Ordnance Equipment Engineering, 2024, 45(05): 58-64.) proposes the use of a variable cone angle hyperbolic liner design. By optimizing the traditional 60° cone angle to a 45° progressive hyperbolic structure, the jet extension rate is increased by about 18%. However, this scheme has strict requirements on the matching of the detonation wave front shape, and it is difficult to maintain jet stability under the low detonation pressure conditions of emulsion explosives. Another study (Combustion, Explosion, and Shock Waves, 2021, 57(6): 719-725.) shows that although the addition of metal powder can effectively increase the density of emulsion explosives and thereby enhance their detonation heat and intensity performance, this method not only lacks an increase effect on the detonation velocity and detonation pressure parameters that play a decisive role in the formation of the shaped charge jet, but may even have an adverse effect.

[0005] Therefore, there is an urgent need for an innovative design method that can break through the bottleneck of interface energy transfer. Through the synergistic effect of impedance gradient matching and interface toughening, the industry problem of coexistence of energy reflection loss and interface failure can be solved, the performance of emulsion explosive focused cutters can be improved, and the development of linear focused technology can be promoted towards high efficiency and refinement. Summary of the Invention

[0006] The present invention aims to address the problems of conventional linear shaped charges for emulsion explosives, such as large energy reflection losses, low jet velocity, insufficient cutting depth, and reduced precision, caused by the wave impedance mismatch between the explosive and the metal liner. This invention proposes a linear shaped charge device for emulsion explosives based on interface layer impedance matching and its assembly method. This technical solution, which improves detonation energy transfer efficiency and jet cutting performance through interface layer impedance matching and microstructure interlocking design, achieves efficient detonation energy transfer and significantly improves jet performance, enabling efficient shaped cutting using emulsion explosives. This device is suitable for high-precision linear shaped charge applications such as engineering blasting, oil pipeline cutting, and military obstacle removal equipment.

[0007] The first object of the present invention is to provide an emulsion explosive linear shaped charge device based on interface layer impedance matching, comprising an emulsion explosive charge body, a metal liner and a composite interface layer, wherein the composite interface layer is arranged between the emulsion explosive charge body and the metal liner, and the composite interface layer is composed of metal powder and a polymer binder in a mass ratio of 7:3-9:1.

[0008] Furthermore, the acoustic impedance value of the composite interface layer is determined by impedance gradient model calculation to satisfy Z 炸药 / Z 界面层 =0.85-1.15 and Z 界面层 / Z 药型罩 =0.9-1.1 impedance matching condition, where the acoustic impedance value Z 界面层 =ρ 界面层 c 界面层 ,ρ 界面层 is the density of the interface layer, c 界面层 is the sound velocity of the interface material, Z 药型罩 =ρ 药型罩 c 药型罩 ,ρ 药型罩 is the density of the liner, c 药型罩 is the sound velocity of the liner material, Z 炸药 =ρ 炸药 c 炸药 ,ρ 炸药 is the density of explosive, c 炸药 is the detonation velocity of the explosive.

[0009] Furthermore, a microstructure interlocking design is used to construct a corrugated or serrated interface reinforcement structure on the inner surface of the liner.

[0010] Furthermore, the peak spacing of the corrugated interface reinforcement structure is 1.2-2.5 mm, and the peak height is 0.2-0.8 mm; the tooth pitch of the serrated interface reinforcement structure is 1.5-3.0 mm, the tooth height is 0.3-1.0 mm, and the tooth surface inclination angle α=45-60°.

[0011] Furthermore, a hot pressing process is used to form a mechanical interlocking interface between the interface layer material and the metal liner reinforcement structure, and the interface bonding strength is not less than 15Mpa; the hot pressing process parameters include: temperature 80-120°C, pressure 8-15MPa, holding time 20-40min, and a heating rate not exceeding 5°C / min.

[0012] Furthermore, the shaped charge device adopts a V-shaped shaped charge hole structure design, and the geometric parameters of the V-shaped shaped charge hole meet the following requirements: cone angle θ=55-65°, shaped charge hole depth H=0.25-0.45 times charge length L, opening width W=0.6-0.8 times charge liner diameter.

[0013] Furthermore, the metal powder is selected from a mixed powder of at least two of tungsten powder, copper powder, and aluminum powder, with a particle size distribution of 5-50 μm, of which fine particles with a particle size of <10 μm account for 30-60 wt%.

[0014] Furthermore, the polymer binder is a blend of modified epoxy resin and polyurethane, and its glass transition temperature T g The curing temperature is 45-75℃, and the curing shrinkage is less than 0.5%.

[0015] Furthermore, the thickness of the composite interface layer is δ=1.5-3.5 mm, which reduces the detonation wave pressure attenuation rate.

[0016] A second object of the present invention is to provide a method for assembling the above-mentioned linear shaped charge device of emulsion explosive based on interface layer impedance matching, comprising the following steps: S1: Pretreatment of liner substrate The T2 copper liner is selected and, after CNC stamping, the surface is degreased. Then, a laser marking machine is used to pre-engraved a positioning grid on the inner surface of the liner as the reference coordinate system for microstructure processing. S2: Microstructure parameter design According to the requirements of the dynamics of the focused jet formation, a corrugated or serrated interface enhancement structure is designed, and the interface enhancement structure is precisely processed using an ultrashort pulse laser; S3: Microstructure Post-Processing and Strengthening Electrolytic polishing is used to post-process the microstructure. After polishing, there are no micro cracks at the tooth root. Al2O3 abrasive is used to introduce residual compressive stress on the surface to improve fatigue resistance. S4: Hot pressing of the liner and the composite interface layer A high-strength steel mold is used, and the cavity size matches the outer contour of the liner. A release agent is sprayed on the inner wall of the mold and baked to form a dense lubricating layer. The liner coated with the composite interface layer slurry is precisely embedded in the mold with a positioning error of ≤0.1mm. Adopting three-stage heating and multi-stage pressure loading and holding strategy for hot pressing, followed by gradient cooling and demoulding; S5: Linear Shaped Charge A V-shaped copper liner is used to cut the sensitized emulsion explosive into rectangular strips, which are then pressurized and loaded section by section along the axial direction of the liner.

[0017] Compared with the prior art, the present invention has the following significant advantages: (1) Significantly improved energy transfer efficiency and excellent cutting performance Through the gradient impedance matching design of the composite interface layer, the energy reflection loss at the interface between the explosive and the liner is effectively reduced, the jet velocity is increased, and the cutting depth is increased to meet the cutting requirements of high-strength steel structure targets.

[0018] (2) High interface bonding strength and stable and reliable charge structure By adopting the corrugated / serrated microstructure on the inner surface of the liner and the hot pressing molding process, the interface bonding strength is increased from less than 5 MPa in the traditional process to more than 15 MPa. It can withstand the dynamic load under the impact of explosion, avoid jet breakage or energy dispersion caused by interface debonding, and ensure that the cutting process is stable and controllable.

[0019] (3) Strong process adaptability and low production cost The composite interface layer material adopts a composite system of conventional metal powder and polymer binder, and the raw material cost is only 1 / 5-1 / 3 of the high-energy explosive solution; the hot pressing molding process is compatible with existing charging production lines and does not require complex equipment modification.

[0020] (4) Wide range of applications and outstanding engineering practicality The charging structure can adapt to various charge liner designs such as V-shaped and wedge-shaped, and is suitable for scenarios such as steel structure demolition blasting, oil pipeline cutting, and military obstacle removal equipment demolition. It is especially suitable for the demand for shaped energy cutting effects in the emulsion explosive charging environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The particle size distribution of copper powder and tungsten powder used for the composite interface layer; Figure 2 Flow chart for slurry preparation; Figure 3 Schematic diagram of the microstructure processing process; Figure 4is the tensile shear stress-strain curve based on the microstructure bonding interface; Figure 5 This is a flow chart of the hot pressing forming interface bonding method; Figure 6 This is a scanning electron microscope image of the hot-pressed interface layer; Figure 7 This is a structural diagram of the shaped charge device; Figure 8 It shows the energy-gathering cutting effect with and without the composite interface layer. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0023] Example 1: Selection and ratio of raw materials for composite interface layer The preparation of the composite interface layer primarily involves raw material selection and proportioning, and slurry preparation. The metal powder used is a mixture of tungsten and copper powders. The tungsten powder has a purity of ≥99.9% and a particle size distribution of 10-30 μm, with fine particles (<10 μm) accounting for 45 wt%. The copper powder is prepared using a gas atomization method, with a purity of ≥99.5% and a particle size distribution of 20-50 μm. Figure 1 The particle size distribution of the copper and tungsten powders used in the composite interface layer is shown. The two powders are mixed in a mass ratio of 8:2. The polymer binder is a 6:4 blend of modified epoxy resin (EP-828, epoxy value 0.51-0.54 mol / 100g) and polyurethane (PU-3010, NCO content 5.2%). 0.5 wt% of a silane coupling agent is added to improve the wettability of the metal powder and binder. The mass ratio of metal powder to binder is 8.5:1.5, meaning 8.5 kg of metal powder to 1.5 kg of binder. This ratio ensures the interface layer has both high thermal conductivity and mechanical strength.

[0024] Preparation of composite interface layer slurry, the preparation process is as follows Figure 2 shown.

[0025] Step 1: Metal powder pretreatment and mixing Tungsten powder (particle size 5-10μm, purity ≥99.5%) and copper powder (particle size 15-30μm, purity ≥99.8%) were selected and mixed in a mass ratio of 6:4; the mixed powder was placed in a three-dimensional mixer and mixed at a speed of 30r / min for 45min to obtain a graded powder with fine particles (<10μm) accounting for 52wt%.

[0026] Step 2: Binder system preparation Modified epoxy resin (E-44 type, epoxy value 0.44) and polyurethane prepolymer (NCO content 12%) were mixed in a mass ratio of 7:3; 1.5% of the total mass of silane coupling agent (KH-560) and 0.8% of defoaming agent (BYK-066N) were added, and stirred at 500 r / min in a 60°C water bath for 20 minutes until the mixture became homogeneous and transparent.

[0027] Step 3: Slurry compounding and dispersion Graded metal powder and binder were added to a planetary mixer at a mass ratio of 8.5:1.5. The mixture was stirred in three stages: a low-speed stirring stage (200 rpm, 10 minutes) for initial powder wetting; a high-speed stirring stage (1200 rpm, 15 minutes) for breaking up aggregates; and a vacuum stirring stage (-0.08 MPa, 600 rpm, 20 minutes) for removing air bubbles. The slurry viscosity was monitored in real time to maintain a final viscosity of 8500 ± 500 mPa·s.

[0028] Step 4: Rheological properties control 0.3 wt% fumed silica was added as a thixotropic agent and stirred at 300 r / min for 10 min. A rotational rheometer was used to test the slurry to ensure that the thixotropic index (TI = η10 rpm / η100 rpm) was within the range of 2.8-3.2 and that there was no sedimentation or stratification after standing for 30 min.

[0029] Step 5: Slurry curing and performance verification The slurry was injected into the mold (thickness 2.0 mm) and pre-cured at 80°C / 1 hour to form a gel network; then fully cured at 110°C / 2 hours; This example specifically describes the precision machining process for the inner surface microstructure of the metal liner, focusing on achieving high-precision periodic structural morphology control and optimizing interface bonding performance. The specific steps are as follows: Step 1: Pretreatment of the liner substrate A T2 copper liner was selected and CNC-pressed. The surface was then degreased by soaking in an alkaline cleaning solution (pH = 10.5, containing 5wt% NaOH and 3wt% Na2CO3) for 15 minutes at 60°C, followed by ultrasonic cleaning in deionized water (40kHz, 10 minutes). A laser marker was used to pre-engraved a positioning grid (5mm × 5mm spacing) on ​​the inner surface of the liner, which served as the reference coordinate system for microstructure machining.

[0030] Step 2: Microstructure parameter design and simulation optimization According to the dynamic requirements of the shaped jet, the sawtooth microstructure is designed (see Figure 3 ). Tooth pitch 2.0mm, tooth height 0.6mm, inclination angle α=55°.

[0031] Step 3: Ultrashort Pulse Laser Precision Machining The laser processing system (1064nm wavelength, 10ps pulse width, 100kHz repetition rate) features a single pulse energy of 0.8mJ, a scanning speed of 800mm / s, and a spot overlap of 85%. A spiral progressive path fill prevents material melting caused by heat accumulation. The roughing phase uses 60W power and three scans to define the structural contours. The finishing phase uses 25W power and one scan to reduce the sidewall roughness to Ra ≤ 1.2μm.

[0032] Step 4: Microstructure post-processing and strengthening The microstructure was post-processed using electrolytic polishing in an electrolyte of 60 vol% phosphoric acid and 40 vol% ethanol at a current density of 15 A / dm² for 30 seconds. No microcracks were observed at the tooth root after polishing. Al2O3 abrasive was used at a pressure of 0.3 MPa, a jet angle of 45°, and a polishing time of 20 seconds. This introduced residual compressive stress on the surface, improving fatigue resistance.

[0033] Step 5: Performance Testing The processed liner was hot pressed with the composite interface layer and subjected to tensile shear test. The results are as follows: Figure 4 As shown in the figure, the interface bonding strength reaches 19.2MPa, and the failure mode is cohesive failure of the interface layer, indicating that the mechanical interlocking effect of the microstructure is significant.

[0034] Hot pressing interface strengthening This embodiment specifically describes a method for strengthening the combination of the liner and the composite interface layer by a hot pressing process. The process is as follows: Figure 5 As shown, the focus is on the multi-parameter coordinated control of temperature, pressure and time and the optimization of interface bonding performance. The specific steps are as follows: Step 1: Mold pretreatment and loading positioning A high-strength steel mold is used, and the cavity size matches the outer contour of the liner; boron nitride release agent is sprayed on the inner wall of the mold and baked at 250℃ for 30 minutes to form a dense lubricating layer; the liner coated with the interface layer slurry is accurately embedded in the mold with a positioning error of ≤0.1mm.

[0035] Step 2: Hot pressing temperature gradient control A three-stage temperature increase strategy was adopted: in the pre-curing stage, the temperature was increased to 80°C at 3°C / min and kept warm for 20 minutes to achieve initial cross-linking of the binder; in the main curing stage, the temperature was increased to 110°C at 2°C / min and kept warm for 40 minutes to achieve complete curing; in the interface diffusion stage, the temperature was briefly increased to 120°C (≤5 minutes) to promote diffusion of metal powder and the micro-area on the surface of the liner.

[0036] Step 3: Multi-stage pressure loading and holding In the pre-pressing stage, 5MPa / 5min is used to eliminate the internal voids of the slurry; in the main pressing stage, 12MPa / 30min is used to promote the plastic flow of metal powder and embed it into the microstructure of the liner; in the precision pressing stage, 8MPa / 10min is used to release residual stress and avoid warping and deformation of the interface layer.

[0037] Step 4: Gradient cooling and demoulding The rapid cooling stage is to reduce the temperature to 80℃ at a rate of 10℃ / min to lock the microstructure of the interface layer; the slow cooling stage is to reduce the temperature to 40℃ at a rate of 2℃ / min to suppress thermal stress concentration; after demoulding, argon protection is used to cool to room temperature to avoid interface oxidation.

[0038] Figure 6 The scanning electron microscope image of the hot press forming interface layer is shown in Figure 2. Figure 6 It can be seen that the improvement of interface compactness after hot pressing will be beneficial to the propagation of detonation waves at the interface.

[0039] Linear shaped charge This embodiment specifically describes the overall design and application of a linear shaped charge structure for emulsion explosives based on interface layer impedance matching, with an emphasis on charge geometric parameter optimization and cutting performance verification in actual engineering scenarios.

[0040] Step 1: Charge structure configuration like Figure 7 As shown, a V-shaped copper liner (60° taper angle, 1.5mm wall thickness) is used, with linear energy-gathering grooves arranged continuously along its length. The inner surface of the liner features a serrated microstructure (2.0mm pitch, 0.6mm height, 55° inclination angle). The composite interface layer is a mixture of tungsten powder (70wt%, particle size 5-20μm) and aluminum powder (30wt%, particle size 10-30μm), mixed in a mass ratio of 8:2 with a modified epoxy resin binder. The interface layer is 2.5mm thick.

[0041] Step 2: Emulsion explosive filling and compaction The sensitized emulsion explosive (density 1.25 g / cm³, detonation velocity 5200 m / s) was cut into rectangular strips and loaded section by section along the liner axis. The initial pressure was pre-pressed at 0.5 MPa for 5 minutes to eliminate the gaps between the charges. The main pressure was increased in steps to 3.0 MPa and maintained at this pressure for 15 minutes to obtain the shaped charge.

[0042] Comparative Example No composite interface layer was used, and other preparation processes were the same as in Example 1 to produce a shaped charge.

[0043] Application Examples Cutting performance verification The shaped charges prepared in Example 1 and Comparative Example 1 were used to vertically cut a 20 mm thick Q345 steel plate, with a blast height of 40 mm; Figure 8To illustrate the focused cutting effect with and without a composite interface layer, by measuring the cutting depth and width of the target plate, it can be found that the cutting depth and width without a composite interface layer are 5-10mm, and the cutting width is 15-30mm. With a composite interface layer, the charge completely penetrates a 20mm thick Q345 steel plate, with a cutting depth of ≥20mm and a cutting width of between 10-20mm.

[0044] Any matters not mentioned above shall be subject to the existing technology.

[0045] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art of the present invention may make various modifications or additions to the described specific embodiments or replace them in similar ways, but they will not deviate from the direction of the present invention or exceed the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the scope of protection of the present invention.

Claims

1. A linear shaped charge device for emulsion explosives based on interface layer impedance matching, characterized in that: The invention comprises an emulsion explosive charge body, a metal charge liner and a composite interface layer. The composite interface layer is arranged between the emulsion explosive charge body and the metal charge liner. The composite interface layer is composited by metal powder and polymer binder in a mass ratio of 7:3-9:

1.

2. The linear shaped charge device for emulsion explosives based on interface layer impedance matching according to claim 1, characterized in that: The acoustic impedance value of the composite interface layer is determined by calculating the impedance gradient model to satisfy Z 炸药 / Z 界面层 =0.85-1.15 and Z 界面层 / Z 药型罩 =0.9-1.1 impedance matching condition; where the acoustic impedance value Z 界面层 =ρ 界面层 c 界面层 ,ρ 界面层 is the density of the interface layer, c 界面层 is the sound velocity of the interface material, Z 药型罩 =ρ 药型罩 c 药型罩 ,ρ 药型罩 is the density of the liner, c 药型罩 is the sound velocity of the liner material, Z 炸药 =ρ 炸药 c 炸药 ,ρ 炸药 is the density of explosive, c 炸药 is the detonation velocity of the explosive.

3. The linear shaped charge device for emulsion explosives based on interface layer impedance matching according to claim 1, characterized in that: A microstructure interlocking design is used to construct a corrugated or serrated interface reinforcement structure on the inner surface of the liner; The peak spacing of the corrugated interface reinforcement structure is 1.2-2.5 mm, and the peak height is 0.2-0.8 mm; the tooth pitch of the serrated interface reinforcement structure is 1.5-3.0 mm, the tooth height is 0.3-1.0 mm, and the tooth surface inclination angle α=45-60°.

4. A linear shaped charge device for emulsion explosives based on interface layer impedance matching according to any one of claims 1 to 3, characterized in that: A hot pressing process is used to form a mechanical interlocking interface between the interface layer material and the metal liner reinforcement structure, and the interface bonding strength is not less than 15Mpa; the hot pressing process parameters include: temperature 80-120°C, pressure 8-15MPa, holding time 20-40min, and a heating rate not exceeding 5°C / min.

5. A linear shaped charge device for emulsion explosives based on interface layer impedance matching according to any one of claims 1 to 3, characterized in that: The shaped charge device adopts a V-shaped shaped charge hole structure design, and the geometric parameters of the V-shaped shaped charge hole meet the following requirements: cone angle θ=55-65°, shaped charge hole depth H=0.25-0.45 times charge length L, opening width W=0.6-0.8 times charge liner diameter.

6. A linear shaped charge device for emulsion explosives based on interface layer impedance matching according to any one of claims 1 to 3, characterized in that: The metal powder is selected from a mixed powder of at least two of tungsten powder, copper powder and aluminum powder, and has a particle size distribution of 5-50 μm, wherein fine particles with a particle size of less than 10 μm account for 30-60 wt%.

7. A linear shaped charge device for emulsion explosives based on interface layer impedance matching according to any one of claims 1 to 3, characterized in that: The polymer binder is a blend of modified epoxy resin and polyurethane, and its glass transition temperature T g The curing temperature is 45-75℃, and the curing shrinkage is less than 0.5%.

8. A linear shaped charge device for emulsion explosives based on interface layer impedance matching according to any one of claims 1 to 3, characterized in that: The thickness of the composite interface layer is δ=1.5-3.5 mm, which reduces the detonation wave pressure attenuation rate.

9. A method for assembling a linear shaped charge device for emulsion explosives based on interface layer impedance matching according to any one of claims 1 to 8, characterized in that: The steps include: S1: Pretreatment of liner substrate The T2 copper liner is selected and, after CNC stamping, the surface is degreased. Then, a laser marking machine is used to pre-engraved a positioning grid on the inner surface of the liner as the reference coordinate system for microstructure processing. S2: Microstructure parameter design According to the requirements of the dynamics of the focused jet formation, a corrugated or serrated interface enhancement structure is designed, and the interface enhancement structure is precisely processed using an ultrashort pulse laser; S3: Microstructure Post-Processing and Strengthening Electrolytic polishing is used to post-process the microstructure, and there are no micro cracks at the tooth root after polishing. Al2O3 abrasive is used to introduce residual compressive stress on the surface to improve fatigue resistance. S4: Hot pressing of the liner and the composite interface layer A high-strength steel mold is used, and the cavity size matches the outer contour of the liner. A release agent is sprayed on the inner wall of the mold and baked to form a dense lubricating layer. The liner coated with the composite interface layer slurry is precisely embedded in the mold with a positioning error of ≤0.1mm. Adopting three-stage heating and multi-stage pressure loading and holding strategy for hot pressing, followed by gradient cooling and demoulding; S5: Linear Shaped Charge A V-shaped copper liner is used to cut the sensitized emulsion explosive into rectangular strips, which are then pressurized and loaded section by section along the axial direction of the liner.

Images