Device for eliminating explosion and cutting off titanium fire in titanium alloy

Abstract

The invention relates to the technical field of titanium fire elimination, in particular to a device for eliminating explosion and cutting off titanium fire in titanium alloy, comprising: a shaped charge structure, the shaped charge structure comprises a charge shell and a high-energy explosive, and the high-energy explosive is arranged in the charge shell to form a shaped cutting rope; the titanium fire eliminating layer is arranged on the side wall of the groove formed in the titanium alloy plate and used for eliminating titanium fire generated in the explosive cutting process through material setting of the titanium fire eliminating layer. According to the device, through the arrangement of the titanium fire eliminating layer, the contact between high-temperature gas generated by explosion in the charging process and titanium alloy can be delayed, and the temperature is greatly reduced when the explosion gas is in contact with the titanium alloy, so that the generation of titanium fire is greatly reduced, and harm and adverse effects caused by the titanium fire in the explosion process are prevented.

Description

Technical Field

[0001] The invention relates to the field of explosive processing, in particular to a device for eliminating titanium fire in explosively cutting off titanium alloys. Background Art

[0002] Titanium alloys are widely used in military, industrial, and personal applications due to their high strength, excellent corrosion resistance, and low thermal conductivity. The lightweighting of aircraft is inseparable from the use of titanium alloys, especially in recent years, where aircraft compressor parts have become widely manufactured from titanium alloys. With the continuous improvement of advanced aircraft engine performance, the high-temperature, high-pressure, and high-speed service environment within the compressor has become more pronounced, greatly increasing the likelihood of titanium fires. This is especially true when the titanium alloy casing is rubbed or scratched by blades or foreign objects, which can cause burn-through at best and even destroy the entire engine at worst, posing a serious threat.

[0003] Uncontained accidents involving Titanium Fire aircraft engines can result in serious air disasters with fatalities. High-speed, high-energy, dangerous debris can penetrate the casing and launch, potentially damaging the aircraft's cabin, fuel tanks, hydraulic lines, and electrical control circuits, seriously endangering flight safety. Therefore, research on the containment of aircraft casings is essential. Casing containment tests verify the casing's tolerance to rotor blades that break and fly away. During the containment test, the flywheel blades must be fractured at a specific position and speed without generating significant residual velocity and fragmentation.

[0004] However, using explosive technology to study the fracture and fall of titanium alloy plates is typically done with high-speed cameras and sensors. However, the intense light emitted by the titanium alloy plates at the moment of explosion can severely affect the camera's operation. The strong light obscures the entire field of view, preventing the high-speed camera from capturing the plate's trajectory, thus affecting subsequent experiments. To ensure the smooth progress of the experiment, the generation of flames during the explosive shearing process must be minimized to reduce the impact of the titanium alloy flame on the camera during high-speed recording.

[0005] Therefore, the anti-titanium fire design and technological progress of titanium alloys can continuously promote the development of my country's aviation engine technology. For example, Chinese patent CN202111420955.9 discloses a titanium fire test device using friction. A titanium alloy casing simulation part coated with a three-layer composite coating is fixed on the combustion chamber fixture of the titanium fire test device to form a pair of friction pairs with a stainless steel rotor part. Under the airflow conditions simulating the engine working conditions, the direct destruction of the flame-retardant and thermal insulation coating in the casing structure is achieved by controlling the friction time and friction contact pressure. The thermocouple measures the transient temperature rise in the friction area to obtain the transient temperature of sustainable combustion. Under the test conditions where sustainable combustion occurs in the titanium alloy casing simulation part without the composite coating, the titanium fire protection test of the aviation engine titanium alloy casing simulation part coated with the composite coating is carried out. The generation of titanium fire is reduced by coating the composite coating on the titanium alloy casing simulation part. Chinese patent CN109518139B discloses a titanium fire-retardant coating, which includes a Cr layer, a CrN layer, a TiAlCrN layer and a TiAlN layer from the inside to the outside. The physical properties between the layers change in a gradient, such as the hardness gradually increases, thereby improving the bonding performance between the film and the substrate. At the same time, the CrN layer also has certain anti-corrosion and anti-oxidation capabilities, while the TiAlN layer has the best anti-oxidation performance, which can effectively limit the diffusion of oxygen atoms in the air to the titanium alloy substrate, preventing the titanium alloy from oxidizing and causing combustion.

[0006] In summary, many current patents mainly focus on coating titanium fire retardant layers on titanium alloys to reduce and prevent the occurrence of titanium fires. Summary of the Invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device for eliminating the explosion and cutting off titanium fire in titanium alloy.

[0008] In a first aspect, the present invention provides a device for eliminating explosive cutting of titanium fire in titanium alloy, comprising:

[0009] A shaped charge structure, comprising a charge shell and high explosives, wherein the high explosives are arranged inside the charge shell to form a shaped cutting rope;

[0010] The titanium fire elimination layer is arranged on the side wall of the groove opened inside the titanium alloy plate, and is used to eliminate the titanium fire generated during the explosive cutting process through its own material setting.

[0011] Preferably, the titanium fire extinguishing layer includes a metal portion, an alloy portion, and a resin glue portion.

[0012] Preferably, it also includes:

[0013] The metal parts include copper sheet, aluminum sheet, lead sheet and tin sheet;

[0014] The alloy portion includes a tin-aluminum alloy;

[0015] The resin glue part includes AB resin structural glue, fireproof coating and glass glue.

[0016] Preferably, the thickness of the titanium fire extinguishing layer is 0.1-1 mm.

[0017] Preferably, the titanium fire extinguishing layer covers the shaped charge structure, and the titanium fire extinguishing layer is in close contact with the side wall of the groove opened inside the titanium alloy plate.

[0018] Preferably, it also includes:

[0019] The charge shell is a centrally symmetrical tubular structure;

[0020] The V-shaped energy-gathering hole is arranged inside the charge shell. The V-shaped energy-gathering hole is a concave structure with a cone angle of 50°-110°. The length is determined according to the length of the charge hole.

[0021] Preferably, the charge shell is made of metal, including one of copper, aluminum, tin and lead.

[0022] Preferably, the high-energy explosive is a single explosive or a mixed explosive, including one or more of RDX, TNT, PBX, HMX, and emulsion explosives.

[0023] Preferably, the high explosive is in powder or latex form.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The V-shaped energy-gathering hole of the shaped charge structure of the present invention can utilize the metal shaped energy jet during the explosion process to more easily and better cut the titanium alloy plate;

[0026] The V-shaped energy-gathering hole in the shaped charge structure can significantly reduce the amount of explosives used, and the metal oxides in the charge are cheap and readily available, thus significantly reducing the cost of raw materials in the operation;

[0027] By setting up a titanium fire elimination layer, the contact between the high-temperature gas generated by the explosion in the charge and the titanium alloy can be delayed, so that the temperature of the explosive gas is greatly reduced when it comes into contact with the titanium alloy, thereby greatly reducing the generation of titanium fire and preventing the hazards and adverse effects caused by the titanium fire during the explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the shaped charge device of the present invention.

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the device of the present invention applied to explosive cutting of titanium alloy plate 3 material.

[0030] In the figure: 1. High-energy explosive; 2. Charge casing; 3. Titanium alloy plate; 4. Titanium fire suppression layer. DETAILED DESCRIPTION

[0031] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0032] A shaped charge device for eliminating titanium fire in explosive cutting of titanium alloy, comprising a shaped charge structure and a titanium fire elimination layer 4;

[0033] The shaped charge structure consists of a charge shell 2 and a high explosive 1, such as a shaped cutting cable and a linear shaped cutter;

[0034] The charge shell 2 is a centrally symmetrical tubular structure with an inwardly concave V-shaped energy-gathering hole on the top. The cone angle of the V-shaped energy-gathering hole is 50°-110°, and the length is determined according to the length of the charge hole.

[0035] The charge shell 2 is made of metal, such as copper, aluminum, tin, or lead;

[0036] High-energy explosive 1 is a single explosive or mixed explosive with high explosive power and high detonation velocity, and is in powder or emulsion form, such as RDX, TNT, PBX, HMX, and emulsion explosive, with RDX being generally selected;

[0037] For example, the present invention can select the shaped charge structure as the shaped cutting rope, the charge as RDX, and the charge shell 2 as lead, and its structural diagram is as follows: Figure 1 As shown;

[0038] The titanium fire extinguishing layer 4 is a metal, alloy or resin glue with good ductility;

[0039] The metal of the titanium fire extinguishing layer 4 includes copper sheet, aluminum sheet, lead sheet, tin sheet, the alloy includes tin-aluminum alloy, and the glue includes AB resin structural glue, fireproof coating, and glass glue;

[0040] The thickness of the titanium fire extinguishing layer 4 is 0.1 to 1 mm;

[0041] Between the shaped charge structure and the titanium fire extinguishing layer 4 is a titanium fire extinguishing layer 4 covering the shaped charge structure, which is then in close contact with the titanium alloy plate 3 and placed in the groove of the slotted titanium alloy plate 3 to serve as a charge device for explosive cutting of titanium alloy.

[0042] Different charging parameters can be selected according to different titanium alloy plate material parameters and sizes and different working conditions, reducing the generation of titanium fire during explosive cutting of titanium alloy, eliminating the hazards and adverse effects caused by titanium fire, and reducing the difficulty of explosive cutting of titanium alloy;

[0043] In summary, the V-shaped energy-gathering hole of the shaped charge structure of the present invention can utilize the metal shaped energy jet during the explosion process to more easily and better cut the titanium alloy plate;

[0044] The V-shaped energy-gathering hole in the shaped charge structure can significantly reduce the amount of explosives used, and the metal oxides in the charge are cheap and readily available, thus significantly reducing the cost of raw materials in the operation;

[0045] By setting up the titanium fire elimination layer 4, the contact between the high-temperature gas generated by the explosion in the charge and the titanium alloy can be delayed, so that the temperature of the explosive gas is greatly reduced when it contacts the titanium alloy, thereby greatly reducing the generation of titanium fire and preventing the harm and adverse effects caused by the titanium fire during the explosion.

[0046] The titanium alloy plate 3 used in the embodiment of the present invention is TC4 titanium alloy, the shaped charge structure used is a shaped cutting cable, and the elimination layer used is a fireproof coating and aluminum foil.

[0047] Example 1

[0048] First, two 120 mm long shaped cutting cables are cut to serve as shaped charges for explosively cutting the titanium alloy plate 3.

[0049] Take a TC4 titanium alloy plate 3 with a size of 100*80*23, and open a groove with a depth of 7mm and a width of 3mm on both sides of the middle of the titanium alloy plate 3 with a thickness of 23mm. The two grooves are symmetrical and 100mm long to be used as gunhole charges. The schematic diagram of the grooves opened in the titanium alloy plate 3 is as shown in the present invention. Figure 2 As shown;

[0050] The fireproof coating is applied to the three sides of the groove of the titanium alloy plate 3 with a thickness of 0.1 mm, and after the glue is completely solidified and dried, as in the present invention, Figure 2 As shown, place the two cut energy-gathering cutting cables flatly with the energy holes facing the two grooves of the titanium alloy plate 3 and secure them with tape, ensuring that the cutting cables are close to the bottom surface of the groove of the iron alloy plate. Place the portions of the two energy-gathering cutting cables that extend beyond the groove on the same side to be used for binding the detonator.

[0051] Clamp and fix the titanium alloy plate 3 loaded with medicine on the platform to be filmed, set up a high-speed camera outside the protective glass, adjust the position of the high-speed camera, set the parameters, and prepare for filming;

[0052] While ensuring the safety of the surrounding environment and taking protective measures, take an electronic detonator and tape it to the end of the shaped cutting rope that extends beyond the groove on the titanium alloy plate 3 to ensure that the shaped cutting rope can be detonated. After connecting the gun line and the detonator, detonate the charge and use a high-speed camera to record the process of the explosion cutting the titanium alloy plate 3 at the moment of detonation.

[0053] The high-speed camera captured the titanium fire generated at the moment of explosion when the titanium alloy plate 3 was explosively cut. Compared with the previous blank experiment without adding the titanium fire extinguishing layer 4, it was found that the titanium fire in Example 1 was greatly reduced, and the titanium alloy plate 3 was explosively cut into two parts, achieving the expected purpose of explosive cutting and eliminating titanium fire of the present invention.

[0054] Example 2

[0055] First, two 120 mm long shaped cutting cables are cut to serve as shaped charges for explosively cutting the titanium alloy plate 3.

[0056] Take a TC4 titanium alloy plate 3 with a size of 100*80*23, and open a groove with a depth of 7mm and a width of 3mm on both sides of the middle of the titanium alloy plate 3 with a thickness of 23mm. The two grooves are symmetrical and 100mm long to be used as gunhole charges. The schematic diagram of the grooves opened in the titanium alloy plate 3 is as shown in the present invention. Figure 2 As shown;

[0057] 0.1mm thick aluminum foil tape is evenly pasted on the three sides of the groove of the titanium alloy plate 3, as in the present invention. Figure 2 As shown, place the two cut cables flat against the grooves of the titanium alloy plate 3, with the energy holes facing inward. Secure with tape, ensuring the cables are flush against the bottom of the grooves of the iron alloy plate. Place the portions of the cables that extend beyond the grooves on the same side to tie the detonators.

[0058] Clamp and fix the titanium alloy plate 3 loaded with medicine on the platform to be filmed, set up a high-speed camera outside the protective glass, adjust the position of the high-speed camera, set the parameters, and prepare for filming;

[0059] While ensuring the safety of the surrounding environment and taking protective measures, take an electronic detonator and tape it to the end of the shaped cutting rope that extends beyond the groove on the titanium alloy plate 3 to ensure that the shaped cutting rope can be detonated. After connecting the gun line and the detonator, detonate the charge and use a high-speed camera to record the process of the explosion cutting the titanium alloy plate 3 at the moment of detonation.

[0060] By watching the titanium fire generated at the moment of explosion when the titanium alloy plate 3 was explosively cut off, captured by a high-speed camera, and comparing it with the previous comparative experiment without adding the titanium fire extinguishing layer 4, it was found that the titanium fire in Example 2 was significantly reduced, and the titanium alloy plate 3 was explosively cut into two parts, achieving the intended purpose of explosive cutting and eliminating titanium fire of the present invention.

[0061] The titanium fire generated at the moment of explosion when the titanium alloy plate 3 was explosively cut was captured by a high-speed camera in Examples 1 and 2, and compared with a blank experiment without adding the titanium fire extinguishing layer 4, Examples 1 and 2 also achieved the intended purpose of the present invention of explosive cutting and eliminating titanium fire.

[0062] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. A device for eliminating explosion and cutting off titanium fire in titanium alloy, characterized in that: include: A shaped charge structure, comprising a charge shell 2 and a high explosive 1, wherein the high explosive 1 is disposed inside the charge shell 2 to form a shaped cutting rope; The titanium fire elimination layer 4 is arranged on the side wall of the groove opened inside the titanium alloy plate 3, and is used to eliminate the titanium fire generated during the explosive cutting process through its own material setting.

2. The device for eliminating the explosion and cutting off titanium fire in titanium alloy according to claim 1, characterized in that: The titanium fire extinguishing layer 4 includes a metal portion, an alloy portion, and a resin glue portion.

3. The device for eliminating the titanium fire in the titanium alloy by explosive cutting according to claim 2, characterized in that: Also includes: The metal parts include copper sheet, aluminum sheet, lead sheet and tin sheet; The alloy portion includes a tin-aluminum alloy; The resin glue part includes AB resin structural glue, fireproof coating and glass glue.

4. The device for eliminating titanium fire in titanium alloy by explosive cutting according to claim 2, characterized in that: The thickness of the titanium fire extinguishing layer 4 is 0.1-1 mm.

5. The device for eliminating titanium fire in titanium alloy by explosive cutting according to claim 2, characterized in that: The titanium fire extinguishing layer 4 covers the shaped charge structure, and the titanium fire extinguishing layer 4 is in close contact with the side wall of the groove opened inside the titanium alloy plate 3.

6. The device for eliminating titanium fire in titanium alloy by explosive cutting according to claim 1, characterized in that: Also includes: The charge shell 2 is a centrally symmetrical tubular structure; The V-shaped energy-gathering hole is arranged inside the charge shell 2. The V-shaped energy-gathering hole is a concave structure with a cone angle of 50°-110°. The length is determined according to the length of the charge hole.

7. The device for eliminating titanium fire in titanium alloy by explosive cutting according to claim 1, characterized in that: The charge shell 2 is made of metal, including one of copper, aluminum, tin and lead.

8. The device for eliminating the titanium fire in the titanium alloy by explosive cutting according to claim 1, characterized in that: The high-energy explosive 1 is a single explosive or a mixed explosive, including one or more of RDX, TNT, PBX, HMX, and emulsion explosives.

9. The device for eliminating titanium fire in titanium alloy by explosive cutting according to claim 1, characterized in that: The high-energy explosive 1 is in powder or latex form.

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